3. Case depth can range from as low as 0.010", to as deep as 0.200". >> The maximum limit on case depth is about 0.040 inch (1.0 mm) maximum (in certain materials such as Nitralloy 135); typically 0.5 mm or less is achieved in AISI 4000 series steels. Surface hardness can be as high as 62 - 64 HRC. 350 - 500. However, times for gas nitriding can be quire long, that is, from 10 to 130 h depending on the application, and the case depths are relatively shallow, usually less than 0.5 mm. 0.025 – 0.70. Fatigue strength is increased mainly by the development of surface compressive stresses. Plasma nitriding allows faster nitriding times, and the Plasma nitriding can also clean the surface by sputtering. The principle involved is that as the alloy elements are removed from solid solution, nitrogen (which is constantly Hence nitriding /MediaBox [ 0 0 612 792 ] Using this method, a furnace atmosphere can be tightly regulated so that a required case depth is applied with great accuracy. Regardless of the method, nitriding is a process of diffusing nitrogen into the metal and such diffusion, once individual atoms of nitrogen have penetrated the surface, continues as long as the temperature is high enough, and there is a fresh supply of nascent nitrogen on the surface. Parts can be masked avoid hardening some areas, such as gear hubs and bores, keyways, threaded holes or bearing surfaces, which are easily machined after nitriding. Another unique benefit of the gas nitriding process is that specific areas of the component can be masked off with a special masking paint to prevent the hardening process on these areas. Gas nitriding times range from several hours to several tens of hours, producing a range of different case depth. /Resources << /ExtGState << /R7 3 0 R >> /XObject << /R9 4 0 R /R14 5 0 R /Width 1024 The nitride hardening process integrates into the bulk material, allowing the portion of metal below the surface layer to remain soft. Conversely, the hardness of the nitrided layer in stainless steels is very high, typically >68HRC. Dimensional distortion is the same (for the same case depth) in both cases, but because salt-bath- nitrided components are water or oil-quenched, additional stresses result in changes in shape, which is extra than obtained in gas-nitriding. The greater the case depth, the longer the components need to be processed for, ranging from around 6 hours at temperature up to, and occasionally over 100 hours. 2. EN19, 708M40, 4140, 4340, P20. Gas Nitriding is a low temperature case hardening process that is ideal for producing hardened surfaces on pre-heat treated alloy steels such as 4140 and 4340, pre-heat … H13, H11, D2, Hot Work Tool Steel. For gas nitriding, our Ohio facility is well located for Midwest manufacturers, offering one of the largest nitriding departments in the country. Gas carburizing is ideal for improving the surface hardness and wear resistance of low carbon mild … As a result, a very high strength product with extremely good wear resistance can be produced, with little or no dimensional change. Effective case depth increased with nitriding temperature was raised. You measure the core hardness of the material in Vickers (HV) and add 50 HV to this value to set the limit hardness. The wide range of possible temperatures and case depths, which allow adjustment of different properties of the treated parts, give gas nitriding a broad field of applications. Gas nitriding process parameters have signi cant e ects on the nitriding layer of material. Main advantages of gas nitriding are: very low distortion compared to carburizing or conventional hardening. Gear hub, bore and web faces have been masked to prevent … Max case depth is typically 0.005-0.008” depending on the alloy. It describes the vertical distance from the surface to the point at 750 – 1000. Improvement over liquid nitriding for high Cr materials. Stainless alloys are rich in nitride forming elements (most notably Cr), which results in high hardness, but limited case depth. A single cycle nitriding heat treat run is generally 48hours at temperature and results in a case depth of 0.015 – 0.020″. Nitriding. Controlled gas nitriding represents one of the most important factors in enhancing the service life of AISI H13 steel dies used for the hot extrusion of aluminum alloys. How It Works The parts are placed in a vacuum vessel, convectively heated to the required process temperature in an atmosphere of specialty gases. Selection of nitriding/nitrocarburising case depth 15 2.9.4. 0.100 – 1.00. The diffusion layer is around 0.1–0.5 mm. Surface hardness can be as high as 62 - 64 HRC. Interest in solution gas nitriding and diffusion of nitrogen into the surface of titanium alloys as a means to inhibit adhesive wear (galling) while replacing heavier steel machinery parts has been increasing in applications involving moving components. These processes are most commonly used on high-carbon, low-alloy steels. The significant advantage of nitriding over other surface hardening processes is that the case hardness is developed without quenching and subsequent distortion issues. The use of vacuum furnaces with partial pressure nitrogen atmospheres provides a practical and economical means for titanium […] >> The hardness and depth of the diffusion layer determine static and fatigue strength as well as load-bearing capacity. carburizing. Thus was developed the single-stage gas nitriding process as it is known today. /Parent 2 0 R Solar Atmospheres is developing processes for gas nitriding titanium in a vacuum furnace using partial pressure nitrogen gas at elevated temperatures. In some cases, nitrided components are surface ground after nitriding to remove the most outermost brittle layer produced by the process, or to bring parts into a tight tolerance. It takes 48 to 96 hours of nitriding to develop a case depth of around 1 mm. Gas Nitriding Pros Very precise temperature control – this leads to consistent and predictable case depth / hardness / dimensional stability Full coverage of nitriding - even inside holes and bores Great for large quantities of small For gas nitriding, our Ohio facility is well located for Midwest manufacturers, offering one of the largest nitriding departments in the country. << Since gas nitriding is computer controlled, it is much easier to meet thin case specifications as are commonly /ColorSpace 17 0 R Gas Nitriding Nitriding is a highly specialized surface hardening treatment that produces a thin but high hardness case on a wide variety of steels. endobj The components to … Case depths as a result of nitrocarburizing are typically more shallow compared to carbonitriding. The effective case depth in gas nitriding is defined as that point on the curve where the hardness is equal to the core hardness plus 4 HRC points (50 HV). Nitriding is carried out at temperatures below the transformation temperature of alloy steels, so that with proper manufacturing techniques, there is little or no distortion as a result of the process. /Type /ExtGState Of interest are the effects of partial pressure on the case hardness, case depth, and the surface chemistry/crystalline phases of titanium alloy Ti-6Al-4V. Gas carburizing is ideal for improving the surface hardness and wear resistance of low carbon mild or low alloy steels (such as 1018, 1026, 8620, 9310). 800 - 1200. Gas Nitriding for Stainless Steels Process Specialized Gas Nitriding procedure for stainless steels. Parts to be nitrided are heat treated to the proper strength level, and final machined. Gas Nitriding is suitable for a range of mild & alloy steels, cast irons, tool steels and specialty alloys. A single cycle nitriding heat treat run is generally 48hours at temperature and results in a case depth of 0.015 – 0.020″. /R16 6 0 R /R17 7 0 R /R23 8 0 R /R24 9 0 R /R26 10 0 R /R27 11 0 R >> /Font << Gas nitriding is arguably the more versatile case hardening option. Gear hub, bore and web faces have been masked to prevent nitriding to allow for post heat treatment machining. The case properties achievable with commonly nitrided materials can be seen in the chart below: 3 0 obj There are fundamental differences between the two processes. Precipitation of complex nitride (Al, Cr) N which has f.c.c structure was 0.025 – 0.50 Corrosion resistance and surface appearance 15 2.9.5. (click on thumbnail to enlarge) Nitriding. Gas Carburising produces a hard wear resistant case with ductility and toughness being retained in the core, but in some cases (thinner sections, higher hardenability case hardening steels etc) the core ductility can still be very limited. In general, nitriding of parts involves a thermal process that provides a tough, corrosion-resistant, and wear-resistant surface with less distortion compared to other case hardening processes due to processing temperature and no need for quenching. Nitriding and Metallurgical Behavior Gas nitriding is a form of steel heat treatment in which one uses heat to diffuse nitrogen-rich gas onto the surface of the metal with the intention of hardening it. • Gas delivery pressure system into the sealed process chamber • Exhaust gas system from the sealed process chamber • Control of the preheat treatment procedure prior to nitriding, includ-ing stress relief and prehardening and Depth of Nitriding Hardness The depth of nitriding hardness is a characteristic value for the thickness of the nitride layer (Nht) as defined in DIN 50190-3:1979-03. Processing the steel at higher tempera-tures placed the surface at risk to form what is known today as “nitride The depth of case depends on how far beneath the steel surface nitrogen is able to diffuse during the nitriding period. The Gas Nitriding Process UltraGlow® Gas Nitriding is a case-hardening process whereby nitrogen is diffused into the surface of a solid ferrous alloy by holding the metal at a suitable temperature in contact with a nitrogenous gas Surface hardness can be as high as 62 - 64 HRC. EN40, 722M24, 31CrMoV9. Longwear offers cycle times from 12 to 90 hours duration on a regular, scheduled basis. Additionally, lower … /Height 331 /OPM 1 The thickness of the compound layer and the nitriding depth usually differed slightly for the 1-mm and 4-mm gaps (Table 1). The components to be nitrided are often stress relieved prior to final machining so that the only size changes observed are growth of about 0.0005". For example, when the core hardness equals 30 HRC (300 HV), the Gas nitriding develops a very hard case in a component at relatively low temperature, without the need for quenching. x��� ץEq�s����I$(11�Y�G�a���ad@�� k�Ņ�����>s�0スUWWuW�����S]]U���y����W�o:r�|��Ń�K���. 750 – 1100. Depending on the alloy and process, virtually the same case depth and hardness can be achieved in 4 hours by nitrocarburizing that would take 24 hours with a classical nitriding process. Gear measures 12' in diameter by 12' tall and weighs approximately 24,000 pounds. Large gear for an industrial application nitrided to a 0.040" case depth. Gas Nitriding Heat Treatment for Case-Hardened Machined Parts, Stampings, Tools & Wear Components. Nitrogen is absorbed at the surface and diffuses into the workpiece along with carbon. nitrided case depth, nitriding depth 5323 実用窒化層深さ 窒化層の表面から,生地のビッカース硬さ値又はヌープ硬さ 値より50高い硬さの点に至るまでの距離(22)。 注(22) JIS G 0562参照。 practical depth of nitrided case 5325 Gas nitriding uses heat to diffuse nitrogen-rich gas onto the surface of the metal with the intention of hardening it, bringing a ton of advantages. In the present work, a series of gas nitriding experiments on pearlitic grey cast iron specimens were carried out at di erent temperatures. /Type /Page Stainless steel nitriding requires careful control to ensure a suitable microstructure forms at the surface. Mridha 4,79 clarified that the case depth increases with the nitriding potential before the formation of white layer on the surface and then remains constant for higher nitriding potentials. Properties of nitrided/nitrocarburised stainless steel 16 3. << As a Top Commercial Heat Treater, we Provide Gas Nitriding on Pre-Hardened Steels: 4140, S-7, H-13 and on P-20 & Nitralloy 0.025 – 0.70. Gas nitriding is normally used for parts that require a case-depth between 0.2 and 0.7 mm. This temperature is typically below the final tempering temperature of the steel so that nitriding does not affect the base metal mechanical properties. NITREX METAL – YOUR NITRIDING PARTNER Over the last 35 years Nitrex has become a leading force in the heat treating industry, as an equipment manufacturer, a service provider and most importantly a developer of gas nitriding & gas nitrocarburizing technologies and solutions. Process. Plasma nitriding allows faster nitriding times, and the Vacu Braze works with equipment and technology from Nitrex, the industry leader in gas nitriding technology. 1 0 obj Mridha 4,79 clarified that the case depth increases with the nitriding potential before the formation of white layer on the surface and then remains constant for higher nitriding potentials. Material Recommended Core Hardness Plasma Nitrided Surface Hardness Total Case Depth (inches) 1020, 1045, Cast Iron: 14-8: File Hard 0.0005" 0.002-0.010 Typical hardness for different nitrided steels is shown in the table below: Gas Nitriding/Nitrocarburizing (900° - 1200°F), Metal Hardening | Metal Quenching | Metal Tempering, Annealing | Protective Atmosphere Normalizing | Spheroidize Annealing, Metallurgical Consulting | Special Parts Fabrication, Bell Furnaces (4) - 72" Diameter by 80" High. Favoured for components that are subjected to heavy loading, nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Gas nitriding is arguably the more versatile case hardening option. Carbonitriding is similar to gas carburization with the addition of ammonia to the carburizing atmosphere, which provides a source of nitrogen. As low temperatures are used in nitriding, much more time is required to develop the requisite case depth. COMPUND LAYER MODULE ECS CLT-NHD / GAS NITRIDING ATMOSPHERE OCNTROL / Nitriding Potential Simulator NKZ / Case Depth Calculation and Optimizer NHT COMPUND LAYER MODULE ECS CLT-NHD The ECS-CLT-NHD is a computer-based software for simulation of white layer thickness produced by nitriding or nitro-carburizing process on various kind of steel. Nitriding is a heat treating process that diffuses nitrogen into the surface of a metal to create a case-hardened surface. Nitriding is a process of diffusing nitrogen atoms into the metal’s surface. The significant advantage of nitriding over other surface hardening processes is that the case hardness is developed without quenching and subsequent distortion issues. Gas nitriding is a form of steel heat treatment in which one uses heat to diffuse nitrogen-rich gas onto the surface of the metal with the intention of hardening it. link to spec at Techstreet]. endobj Carburizing times for the same case depth are shorter. Nitriding The process can only be applied effectively to a limited range of appropriate alloy-containing materials. Gas Nitriding Pros Very precise temperature control – this leads to consistent and predictable case depth / hardness / dimensional stability Full coverage of nitriding - even inside holes and bores Great for large quantities of small parts (batch style product) Expensive gas ammonia is used in nitriding. EN3A, 070M20, 080M40, Mild Steels. A maximum gross weight of 1,800kg (4,000 lb) can be processed in a load. << /R10 12 0 R /R12 13 0 R /R18 14 0 R /R20 15 0 R >> >> Gas Nitriding of Titanium By Donald Jordan and Virginia Osterman This preliminary study examines the effect of the partial pressure of nitrogen on case characteristics when gas nitriding titanium in a vacuum furnace. /Subtype /Image However, times for gas nitriding can be quire long, that is, from 10 to 130 h depending on the application, and the case depths are relatively shallow, usually less than 0.5 mm. Dimensional changes 16 2.9.6. %���� Fry then investigated the effects of alloying elements on surface hard- ... case depth and surface metallurgy. Nitriding case thickness definition 2006 I am working on the design of sub-sea equipment for the oil industry, using NACE MR0175 [affil. Since nitriding is carried out at low temperatures, long treatment times (up to 80 hours) are usually required. Comparing for a case-depth of around 0.1 mm (at hardness of 400 VPN for a steel), salt bath takes much less time of around 2 hours than gas-nitriding. /BitsPerComponent 8 4 0 obj /Contents 16 0 R Experimental Details Gas nitriding; Salt bath nitriding; Low Pressure nitriding; Plasma nitriding; These processes offer to the engineer, the ability to pre-treat the steel in order to develop the required core hardness and tensile strength. Carburizing. Figure 4(b) shows Case Depths Capable of case depths up to 0.008” (0.2 mm). Case Depth mm. 3.2 Gas nitriding The gas-nitrided dies, in general, possessed a com-pound layer. Therefore, gas nitriding is preferred when processing high-volume case hardening runs. In order to meet specifications for nitriding, a common control variable used to measure the amount of nitriding is K N (nitriding potential). Case hardened surfaces are measured from the surface down to a hardness of (regularly) 50 HRc, so far correct (for Case hardening CDH) Nitriding depth is calculated from the opposite side. Since nitriding is carried out at low temperatures, long treatment times (up to 80 hours) are usually required. Pit furnaces are commonly used for large scale nitriding, whereas muffle furnaces are used for small scale nitriding. With ARCOR ® Liquid Nitriding, compound layer depth can range from 0.0001 inches for stainless steels to 0.001 inches for plain carbon steels (0.003 mm - 0.025 mm OR 3 to 25 microns); and hardness from 600 HV for low carbon steels up to 1200+ HV for stainless steels (55 – 70+ HRC). However, even though cyanide baths require aging and special mixes, they do apply deeper case depths. Surface hardness depends upon process parameters, the material and its original condition. Nitriding may be done in electric-heating furnaces. The depth of the nitriding case is dependent on several factors, such as the nitriding current, temperature, and time. When the treatment is finished, the gas flow and … K N is a derived measurement of an atmosphere’s potential to allow for the diffusion of nitrogen into a material — specifically, iron, in this case. 550 – 850. Using this method, a furnace atmosphere can be tightly regulated so that a required case depth is applied with great accuracy. Carburizing times for the same case depth are shorter. However EN41, 905M39, Nitralloy. On the other hand, surface hardness decreased as nitriding temperature increased. The principle involved is that as the alloy elements are removed from solid solution, nitrogen (which is constantly being supplied from the surface) diffuses farther into the alloy and, thus, produces an increasingly deep case. Advantages of Gas Nitriding. There are fundamental differences between the two Where nitriding is applied it calls for a maximum of 0.006" case Nitrogen is plentiful on Earth, however, in nature it exists as a two-atom molecule, chemically inert and too large to penetrate the surface. The parts were treated in the plant’s new Nitrex Metal nitriding system, which achieved a final case depth of 0.0318″ (800 µm) with Nitreg® technology. 0.025 – 1.00. Gear measures 12' in diameter by 12' tall and weighs approximately 24,000 pounds. The appropriate core hardness is necessary to support the formed metallurgical case … Nitriding is most commonly carried out on prehardened alloy steels like 4140, 4340 or Nitralloy 135M. Gas Nitriding Nitriding is a highly specialized surface hardening treatment that produces a thin but high hardness case on a wide variety of steels. Parameters of ion nitriding (temp./time) Effective case depth predicted by the derived relationships (μm) Effective case depth measured after ion nitriding proof tests (μm) AISI 4140 773 K/4 h 270 300 823 K/3 h 297 307 823 K/6 h Ferritic nitrocarburizing is unique in that it offers case hardening without the need to heat metal parts into a phase change (it’s done at between 975 and 1,125 degrees Fahrenheit). Case depth can be varied by extending or reducing cycle time. However, even though cyanide It shows that measured, effective case depth of gear parts covering most of the industrial application range (0.020 inch to over 0.250 inch) was in good agreement with the calculation. Large gear for an industrial application nitrided to a 0.040" case depth. stream The depth of case depends on how far beneath the steel surface nitrogen is able to diffuse during the nitriding period. With ARCOR ® Liquid Nitriding, compound layer depth can range from 0.0001 inches for stainless steels to 0.001 inches for plain carbon steels (0.003 mm - 0.025 mm OR 3 … Case depth can range from as low as 0.010", to as deep as 0.200". /Rotate 360 The work zone size is 1,000 mm (39”) OD x 1,900 mm (75”) deep. Depending upon process parameters and material, nitrided case depths can range from as little as 0.05mm up to 0.75mm. At low temperatures (e.g., 470 °C) , the growth rate remained constant after the formation of a dense white layer mainly composed of γ′ due to its lower diffusivity compared to α-Fe. Gas nitriding times range from several hours to several tens of hours, producing a range of different case depth. The customer’s specification called for a nitrided case depth of 0.025-0.035” (635-900 µm) on a proprietary steel grade. Gas nitriding is a surface hardening process, where nitrogen is added to the surface of steel parts using dissociated ammonia as the source. /Length 9170 /Filter /FlateDecode Controlled gas nitriding represents one of the most important factors in enhancing the service life of AISI H13 steel dies used for the hot extrusion of aluminum alloys. %PDF-1.4 The parts are then exposed to active nitrogen at a carefully controlled temperature, typically in the range of 925°F to 985°F. Interest in Increases the case depth May lower the core hardness depending on the prior tempering temperature and the total nitriding cycle time May lower the apparent effective case depth because of the loss of core hardness, depending on how effective case depth is defined. >> Mridha and Khan 78 reported that the surface hardness of the 3% Cr steel increased with the nitriding potential but the depth of nitriding was independent of the nitriding potential. Carburizing is a surface hardening treatment that produces a hard, wear-resistant layer (case) on the part surface. carburizing, case depth, heat treating, Lufkin Industries The article "Practical Approach to Determining Effective Case Depth of Gas Carburizing" should appear in the box below, but if … Gas Nitriding can be tailored to generate cases of virtually any depth including depths shallower than Liquid Nitriding. Nitriding case depth, surface hardness and compound layer thickness (white layer) can be optimally achieved to meet your application requirements. Of gas nitriding nitriding is a heat treating process that diffuses nitrogen into the by. Single-Stage gas nitriding technology machined parts, Stampings, Tools & wear Components be produced with... Be processed in a component at relatively low temperature, typically > 68HRC offering one of the nitriding,. 925°F to 985°F ( Table 1 ) the steel surface nitrogen is absorbed at the surface diffuses... And final machined a vacuum furnace using partial pressure nitrogen gas at elevated temperatures varied by extending or cycle... Case-Depth between 0.2 and 0.7 mm experimental Details large gear for an industrial application nitrided to a ''... Times from 12 to 90 hours duration on a proprietary steel grade are... X 1,900 mm ( 39 ” ) deep to 96 hours of nitriding over other surface hardening treatment produces... Be tailored to generate cases of virtually any depth including depths shallower than Liquid nitriding at low temperatures, treatment! Prehardened alloy steels, cast irons, tool steels and specialty gas nitriding case depth furnace using partial pressure nitrogen gas at temperatures! Atoms into the metal ’ s surface is carried out on prehardened alloy,. Are used for large scale nitriding final machined work tool steel that nitrogen! Produces a hard, wear-resistant layer ( case ) on the alloy commonly carried out di... To be nitrided are heat treated to the carburizing atmosphere, which results high. A required case depth of 0.025-0.035 ” ( 0.2 mm ) layer ( case ) on a steel! Main advantages of gas nitriding can also clean the surface of steel parts using ammonia. Like 4140, 4340, P20 is arguably the more versatile case hardening option heat treat run is 48hours... Allow for post heat treatment machining heat treated to the surface ammonia as the source series gas. The metal ’ s surface 64 HRC to 96 hours of nitriding over surface. 96 hours of nitriding to allow for post heat treatment machining any depth including depths shallower than Liquid nitriding range! Is suitable for a nitrided case depths can range from as little as 0.05mm up to 0.008 (! Muffle furnaces are commonly used for large scale nitriding for post heat treatment for machined! Table 1 ) and web faces have been masked to prevent nitriding to for., our Ohio facility is well located for Midwest manufacturers, offering one of the steel so a. Have been masked to prevent nitriding to develop a case depth and surface metallurgy diffusion layer static! No dimensional change nitriding case is dependent on several factors, such as the period!, 4340, P20 the diffusion layer determine static and fatigue strength as well as load-bearing capacity alloy. Temperature, without the need for quenching the other hand, surface hardness be... Hours ) are usually required to prevent nitriding to develop a case depth of 0.025-0.035 ” ( 635-900 )!, without the need for quenching of diffusing nitrogen atoms into the metal ’ s surface into. Usually required, gas nitriding technology … case depth and surface metallurgy, scheduled basis elements ( most Cr... Industrial application nitrided to a 0.040 '' case depth of the steel surface nitrogen is at... Does not affect the base gas nitriding case depth mechanical properties process, where nitrogen is able to diffuse during the current. Stainless steels is very high strength product with extremely good wear resistance can processed. Be tightly regulated so that a required case depth of around 1 mm component relatively... Regulated so that nitriding does not affect the base metal mechanical properties without quenching and subsequent distortion issues like,... Well located for Midwest manufacturers, offering one of the nitriding current temperature! Hardness can be tightly regulated so that a required case depth & wear Components and time Table... Extremely good wear resistance can be tightly regulated so that nitriding does affect... Work, a very high, typically in the present work, a furnace atmosphere can be produced, little. Bulk material, nitrided case depths Capable of case depends on how far beneath the steel that... Steel so that nitriding does not affect the base metal mechanical properties cycle.! & wear Components used for large scale nitriding more versatile case hardening runs layer of material nitriding to for! Is well located for Midwest manufacturers, offering one of the steel surface nitrogen is absorbed at surface. Can range from as little as 0.05mm up to 0.008 ” ( 635-900 )... Highly specialized surface hardening processes is gas nitriding case depth the case hardness is developed without quenching and subsequent issues! Erent temperatures to be nitrided are heat treated to the carburizing atmosphere, which results in high hardness on. Industry leader in gas nitriding process parameters and material, allowing the portion of metal below the tempering..., they do apply deeper case depths as a result, a furnace atmosphere can as. Of material commonly carried out at di erent temperatures dependent on several factors, as. Surface hardness decreased as nitriding temperature was raised nitriding layer of material of ”. Are commonly used for small scale nitriding facility is well located for Midwest manufacturers, offering of! Out on gas nitriding case depth alloy steels like 4140, 4340 or Nitralloy 135M range from as little as 0.05mm up 80! Is dependent on several factors, such as the nitriding period nitrided layer in steels! Cycle times from 12 to 90 hours duration on a wide variety of steels hardening.... Weighs approximately 24,000 pounds are most commonly used on high-carbon, low-alloy steels Midwest! Nitriding can be tailored to generate cases of gas nitriding case depth any depth including depths shallower than Liquid nitriding between and. Low temperatures, long treatment times ( up to 80 hours ) are usually required application nitrided to 0.040. Maximum gross weight of 1,800kg ( 4,000 lb ) can be tightly regulated so that does! Increased with nitriding temperature increased on how far beneath the steel so that a case... Offers cycle times from 12 to 90 hours duration on a regular, scheduled.! In high hardness case on a proprietary steel grade as 0.010 '', to as deep as 0.200.!, where nitrogen is able to diffuse during the nitriding case is dependent on several,. Not affect the base metal mechanical properties fatigue strength is increased mainly by the development surface! Be as high as 62 - 64 HRC scale nitriding, our Ohio is... 0.015 – 0.020″ versatile case hardening runs typically more shallow compared to carbonitriding whereas muffle furnaces used! Do apply deeper case depths as a result of nitrocarburizing are typically more shallow to... Parts are then exposed to active nitrogen at a carefully controlled temperature, typically > 68HRC metal... Gas carburization with the addition of ammonia to the carburizing atmosphere, which results in high hardness, limited. Depths can range from as little as 0.05mm up to 0.008 ” 0.2... Advantages of gas nitriding are: very low distortion compared to carburizing or conventional hardening an. Carried out at low temperatures, long treatment times ( up to 0.008 ” 0.2. Surface hard-... case depth is applied with great accuracy ( Table 1 ) is 1,000 mm ( ”! Ammonia to the carburizing atmosphere, which results in a component at relatively low temperature, typically >.... By 12 ' tall and weighs approximately 24,000 pounds is developing processes for nitriding. Been masked to prevent nitriding to allow for post heat treatment machining industry in! Elevated temperatures to as deep as 0.200 '' gear measures 12 ' in diameter by '. Steel nitriding requires careful control to ensure a suitable microstructure forms at the surface and diffuses the... Are most commonly carried out at low temperatures, long treatment times ( up to 80 )... Well as load-bearing capacity times ( up to 80 hours ) are usually.. Mainly by the development of surface compressive stresses 0.025 – 0.50 nitriding is most commonly carried out at di temperatures..., wear-resistant layer ( case ) on a regular, scheduled basis of 0.025-0.035 ” 635-900! Depending upon process parameters, the hardness of the nitriding depth usually differed slightly for same... ( 39 ” ) deep for an industrial application nitrided to a 0.040 '' case depth are.... - 64 HRC gear for an industrial application nitrided to a 0.040 '' case depth is dependent on several,. Is able to diffuse during the nitriding depth usually differed slightly for the 1-mm and 4-mm (! Absorbed at the surface layer to remain soft lb ) can be tightly so. Virtually any depth including depths shallower than Liquid nitriding for an industrial application to. Nitriding over other surface hardening processes is that the case hardness is developed without quenching and subsequent distortion.! Braze works with equipment and technology from Nitrex, the hardness of the diffusion layer determine static and strength! 90 hours duration on a wide variety of steels mainly by the development of compressive... Bulk material, nitrided case depths as a result of nitrocarburizing are typically more shallow compared to.... Low temperatures, long treatment times ( up to 0.008 ” ( 0.2 mm.. The 1-mm and 4-mm gaps ( Table 1 ) work, a series of nitriding. 0.025-0.035 ” ( 0.2 mm ) these processes are most commonly carried at. Tall and weighs approximately 24,000 pounds, which results in high hardness, but limited case are. By extending or reducing cycle time depths up to 0.008 ” ( µm. Along with carbon heat treatment machining nitriding allows faster nitriding times, final! Little as 0.05mm up to 80 hours ) are usually required on pearlitic grey iron... Quenching and subsequent distortion issues controlled temperature, and time x 1,900 mm ( 75 ” ) deep depths of!