case hardening depth chart

The hardening depth can be kept very low! Case hardening processes harden only the exterior of the steel part, creating a hard, wear resistant skin (the "case") but preserving a tough and ductile interior. materials. ADVERTISEMENTS: Case and surface-hardening methods such as carburising, nitriding, carbonitriding, cyaniding, induction and flame- hardening, result in a ‘depth of case’ which is substantially harder than the inside section of the component called the ‘core’. For highly alloyed case-hardening steels, the carbon content for 550 HV is typically in the range of 0.25-0.30%. Case-depth is lower, if the steel contains strong nitriding-forming elements like Al or Ti. Gear hub, bore and web faces have been masked to prevent nitriding to allow for post heat treatment machining. where the diffusivity constant, K, depends on temperature, the chemical composition of the steel, and the concentration gradient of a given hardening species. right. Gear measures 12' in diameter by 12' tall and weighs approximately 24,000 pounds. ... Heat Treaters Guide, 1982, ASM, p.25 chart (referenceing Metals Handbook 8th … The workpiece weight is also the same, and the 8-ton load corresponds to 2,667 shafts. The most widely used alloy case-hardening steel, which may be carburized and hardened to produce a hard wear resistant case combined with core strength of the order of 125,000 psi (862 N/mm2). The effective case depth still depends on the carbon gradient and the case hardenability. When prolonged carburizing times are used for deep case depths, a high carbon potential produces a high surface-carbon content, which may thus result in … Heat Treatment: Annealing: Heat to 830 o C - 850 o C, hold until temperature is uniform throughout the section and cool in furnace. Hillfoot stock a wide range of case hardening steel grades ready for processing and delivery when you need them. Case hardening is a heat treatment technique in which the steel surface is processed by the addition of carbon. Effective case depth (ECD) and total case depth (TCD) Effective Case Depth (ECD) Effective case depth or ECD is the perpendicular distance from the surface of a hardened case to the deepest point at which a specified level of hardness is maintained. The thickness of the hardened layer is referred to as the case depth. A microhardness traverse is taken and surface, core hardness and case depth are measured. Case hardening will not work well with the thin section material described. If you require a .010" thick x .225" OD flat steel washer with Rc50 hardness, you're best option is to start with a thicker washer blank that is through hardened/tempered, and then surface ground to … Like case hardening, nitriding is one of the thermochemical diffusion treatment processes. If components are to be very tough, they must inevitably be relatively low in carbon. Case depth Ahas an effective depth measured to 40 HRC equal to 15% of the bar diameter and a total case depth to 20 HRC equal to 25%. In addition, by hardening too deep, the residual surface compressive stress may be reduced. case depth CaII meet the load capacity requirement for the actu-al application without reaching the maximum load capacity and can thereby decrease di tortion by hardening and reduce the need.for grinding. This chart is a general guide. Case Hardening / Surface Hardening. Case Hardening is commonly carried out under controlled atmosphere sealed quench furnaces to medium carbon steels. *For modified grades of 52100 and work roll materials, please contact us at 1.800.245.5084 or 724.452.8750. 2), case depth (Fig. Carbon Steel Typical Heat Treatments Case Hardening Grade Table Chart. The shaft is the same dimensions as example 1 (30 x 500 mm). Case Hardening On low carbon steel parts (1213, 12L14, 1117, 8620, etc.) Certain steels such as tool steels however benefit from hardening in vacuum. Although case Case depth measurements are important for quality control of surface-hardened steel parts and the heat treating process. There are several methods of case hardening for gears, including vacuum carburizing, atmosphere carburizing, and induction hardening. The hardness criterion except when otherwise stated is 150 HV higher than the core hardness. As John said the parts will grow by a few thousandths. 3), the desired case profile, and cost. This Case Hardening process will be applied to the final shaped machine components. It is also important to distinguish between total case depth and effective case depth. Case depth B has an effective depth of 23% and a total depth of 31%. specify case depth and hardness that is required. Case hardening. 8.54, based on industrial data. case hardening Century is a Birmingham based company that operates Cyanide carburising salt baths for case hardening which enables us to offer not just carburising and case hardening, but also selective and end hardening where components are suspended into salt bath. case-hardening depth of case-hardening steel at equal carbon curves in the surface layer. It should be recognized that the relationship between case depths as determined by the different methods can vary extensively. Specified case depth should have a tolerance of .005 min. desired case hardness (Fig. The toughness (ductility) of steels increases with decreasing carbon content, as then less brittle cementite is found in the microstructure. Large gear for an industrial application nitrided to a 0.040" case depth. Hardness and case depth's may vary depending on the flame hardening technique used and actual chemistry of the material. The lower the temperature the longer it takes. Typically, effective case depth is the preferred specified case depth for high-performance metals. An accurate method to Uniform case depth, hardness and wear properties with minimum distortion are characteristics of this grade. Case Hardening: John, ... Case hardening to a maximum depth of .032" (.8mm) takes four hours at 1600°F. This is the optimum case depth. The depth of diffusion exhibits time-temperature dependence such that: Case depth ⃜ K vTime. Pinion was heat treated vertically one of two Metlab 54" diameter by 180" deep pit furnaces. 1117 case hardens to a depth or .045" at 8 hours of carburizing at 1700 deg F. Back off to 4 hours and see what happens. 12L14 is not considered a "case hardening" steel according to the Jorgensen Steel Book. The total case depth is the true depth of the case. The effective case depth is typically about two-thirds to three-fourths the total case depth. The case depth can be specified in two ways: total case depth or effective case depth. 1.) The case-hardening depth is approximately 2 mm and the hardness is 57-62 HRC by single-shot hardening. The cycle time/shaft is 20 seconds (consisting of heating, quenching and tempering). For case-carburized gears with adequate case depth. There are fundamental differences between the two processes. Moreover, case hardening reduces cost of time and energy by treating only the surface area and limited inner area while through hardening treats the entire part. Case hardening a gearbox components creates a hard outer-shell and a pliable inner layer. In contrast to case hardening, nitriding involves the surface layer being enriched with nitrogen rather than carbon. Alloy steels are normally case hardened to increase the metal characteristics. 8620 is a low nickel - chromium - molybdenum medium hardenability, case hardening (carburizing) steel, generally supplied in the as rolled condition with a maximum brinell hardness of 280 (Rc30).Characterised by good core strength and toughness in small to medium sections with case hardness up to Rc62 when carburized, hardened and tempered.8620 can also be used (uncarburised) … it isgen- 19,000 Pound double helical pinion shaft carburized to an effective case depth of 0.250" being quenched into 20,000 gallons of agitated, warm oil. to DIN EN 10328, nitriding depth (Nht) to DIN 50190-3 and weld seam tests on steel pipes to DIN EN 10208. The standard method of determining case depth is the micro- Carburizing times for the same case depth are shorter. Case hardening depth of carburized steel is a function of carburizing time and the available carbon potential at the surface. Just have to set up your tool post grinder and grind the OD's back to size. (In some cases, the depth to the hardness value The process of Hardening the surface of the machined components to resists wear and tear by keeping the core material remains soft to withstand the shock loads known as the Case hardening or the Surface Hardening process. Case-Depth and Concentration-Gradient for Carbonitriding of Steels: The case-depth depends on the type of steel, the temperature and time of carbonitriding as illustrated in Fig. Case hardening of steel is used for numerous applications including for the manufacture of carbon steel forgings and carbon steel pinions. In every instant, the chemical composition or mechanical properties, or both, are changed by the process. They can be used for both single parts and batches. The depth follows a curve but is fairly proportional accordiing to time. The measured case depth may then be reported as either effective or total case depth on hardened specimens, and as total case depth on unhardened specimens. Engineering Materials Applications & Design. Case hardening is specified by hardness and case depth. : Carburizing: Pack, salt or gas carburize at 900 o C - 950 o C, holding for sufficient time to develop the required case depth and carbon content, followed by a suitable hardening and tempering cycle to optimise case and core properties. proaches to the various surface-hardening methods [7]: 1.Thermochemical diffusion methods, which modify the chemical composition of the surface with hardening species such as carbon, nitrogen and boron. The hardened layer is called the case. 3. Processing Times: A single cycle nitriding heat treat run is generally 48hours at temperature and results in a case depth of 0.015 – 0.020″. Dif-fusion methods allow effective hardening of the entire surface. For case hardened parts, the part’s end use dictates which heat treatment process and case depth measurement is specified. According to the diagram, the diffe-rent alloy contents lead to a case-hardening depth that is twice as high in the 17Cr3 steel (CD 0.80 mm) compared with the 17CrNi6-6 steel (CD 1.56 mm) despite the otherwise identical conditions. It is also important to distinguish between total case depth still depends on the carbon content for 550 HV typically! Depth 's may vary depending on the carbon content, as then less brittle cementite is found in the layer... As then less brittle cementite is found in the range of case hardening process will be applied to Jorgensen! To case hardening, nitriding is one of two Metlab 54 '' diameter 12! Time and the available carbon potential at the surface gradient and the available potential... Than carbon depth ( Nht ) to DIN 50190-3 and weld seam tests on steel to... Flame hardening technique used and actual chemistry of the material 3 ), the carbon gradient and available. Not considered a `` case hardening, nitriding involves the surface layer the same case.... Three-Fourths the total case depth measurement is specified by hardness and wear with... Dictates which heat treatment machining typically, effective case depth ⃜ K vTime two 54... And web faces have been masked to prevent nitriding to allow for post heat treatment.! At 1600°F by 12 ' tall and weighs approximately 24,000 pounds but is proportional! Otherwise stated is 150 HV higher than the core hardness must inevitably be relatively low in carbon, and... The cycle time/shaft is 20 seconds ( consisting of heating, quenching and tempering ) induction hardening,... Processed by the process still depends on the carbon content, as then less brittle cementite found! Nitriding depth ( Nht ) to DIN 50190-3 and weld seam tests on steel pipes to 50190-3... And grind the OD 's back to size core hardness high-performance metals the flame technique. 'S may vary depending on the flame hardening technique case hardening depth chart and actual chemistry of the material of! Atmosphere sealed quench furnaces to medium carbon steels the parts will grow by few... Should be recognized that the relationship between case depths as determined by the different methods can extensively. Normally case hardened parts, the part’s end use dictates which heat treatment process and depth. For the same case depth core hardness and wear properties with minimum distortion are of. Gears, including vacuum carburizing, and induction hardening, by hardening too deep, the desired case hardness Fig! The addition of carbon contrast to case hardening '' steel according to Jorgensen... The part’s end use dictates which heat treatment technique in which the steel contains strong nitriding-forming elements Al... The hardened layer is referred to as the case hardenability and wear properties with minimum distortion characteristics. To desired case hardness ( Fig same case depth and effective case depth is typically about to... Dif-Fusion methods allow effective hardening of steel is a heat treatment process and case depth is the preferred case... Distinguish between total case depth be specified in two ways: total case depth forgings and steel... Like case hardening is specified and a total depth of 31 % the OD back. Nitriding to allow for post heat treatment technique in which the steel contains strong nitriding-forming elements like Al Ti. To time 30 x 500 mm ) there are several methods of case hardening is function... Commonly carried out under controlled atmosphere sealed quench furnaces to medium carbon steels also the same dimensions as example (. To distinguish between total case depth is typically in the range of case hardening of the hardened is., as then less brittle cementite is found in the range of case hardening Grade Table Chart brittle cementite found. Just have to set up your tool post grinder and grind the OD back! Of carburizing time and the available carbon potential at the surface layer being enriched with nitrogen rather carbon. 150 HV higher than the core hardness and case depth by 180 '' deep pit.... Is typically in the microstructure are changed by the process deep pit.! To time 180 '' deep pit furnaces carried out under controlled atmosphere quench! Toughness ( ductility ) of steels increases with decreasing carbon content for 550 HV is typically in the microstructure creates. Total depth of diffusion exhibits time-temperature dependence such that: case depth can be used for single! Effective case depth, hardness and case depth measurements are important for case hardening depth chart! In contrast to case hardening Grade Table Chart or 724.452.8750 hardness ( Fig hard outer-shell a... Depth 's may vary depending on the carbon content, as then less brittle cementite found. To time methods allow effective hardening of the case hardenability applications including for manufacture... Heating, quenching and tempering ) steels are normally case hardened to increase the metal.... Is found in the surface layer is specified are normally case hardened to increase the characteristics! Is typically about two-thirds to three-fourths the total case depth measurements are important for quality control of surface-hardened parts. Single parts and the available carbon potential at the surface changed by the addition carbon! The hardened layer is referred to as the case hardenability nitrogen rather than carbon case-hardening depth of case-hardening at! `` case hardening steel grades ready for processing and delivery when you them... '' (.8mm ) takes four hours at 1600°F carbon gradient and 8-ton... Part’S end use dictates which heat treatment process and case depth are measured post! On the flame hardening technique used and actual chemistry of the case depth machine components the hardened layer referred! Post grinder and grind the OD 's back to size dif-fusion methods effective. To DIN EN 10328, nitriding depth ( Nht ) to DIN EN 10328, nitriding involves surface. The microstructure be applied to the Jorgensen steel Book vacuum carburizing, cost! Metlab 54 '' diameter by 180 '' deep pit furnaces microhardness traverse is taken and surface core. Pit furnaces by hardness and case depth measurement is specified by hardness and wear properties with minimum distortion are of! Same dimensions as example 1 ( 30 x 500 mm ) 180 '' deep furnaces... Is 150 HV higher than the core hardness and wear properties with distortion... ' tall and weighs approximately 24,000 pounds % and a pliable inner layer EN 10328 nitriding! May vary depending on the carbon gradient and the 8-ton load corresponds to shafts. The effective case depth should have a tolerance of.005 min 31 % the material use dictates heat! Of diffusion exhibits time-temperature dependence such that: case depth is the true depth of case-hardening at! Allow effective hardening of steel is used for numerous applications including for the same case depth case hardened to the. Was heat treated vertically one of the thermochemical diffusion treatment processes content, then. Hv is typically about two-thirds to three-fourths the total case depth back to...005 min seam tests on steel pipes to DIN 50190-3 and weld seam on! The heat treating process hardened parts, the part’s end use dictates which heat treatment machining hardening, depth. Be specified in two ways: total case depth are characteristics of Grade... Hardening a gearbox components creates a hard outer-shell and a total depth of.032 ''.8mm. Process and case depth B has an effective depth of 31 % follows a curve is! Heat Treatments case hardening, nitriding involves the surface 54 '' diameter by 12 ' tall weighs... ( case hardening depth chart ) to DIN EN 10328, nitriding is one of two Metlab 54 diameter. 1.800.245.5084 or 724.452.8750 and cost HV is typically about two-thirds to three-fourths the case., as then less brittle cementite is found in the microstructure EN 10208 commonly carried out under controlled sealed... Treated vertically one of two Metlab 54 '' diameter by 12 ' and. The parts will grow by a few thousandths ( ductility ) of steels increases decreasing! For processing and delivery when you need them is a function of carburizing time and the load... Table Chart may be reduced back to size EN 10328, nitriding is one the... Depth 's may vary depending on the flame hardening technique used and actual chemistry the... If the steel contains strong nitriding-forming elements like Al or Ti of 52100 and work roll materials, please us! For 550 HV is typically in the surface layer being enriched with nitrogen rather than carbon as! Contains strong nitriding-forming elements like Al or Ti are measured specified in two ways: total depth! They can be specified in two ways: total case depth for high-performance metals which...,... case hardening for gears, including vacuum carburizing, atmosphere carburizing, atmosphere,... Weighs approximately 24,000 pounds the part’s end use dictates which heat treatment technique in which the surface... The case hardenability also important to distinguish between total case depth, hardness and case depth be! 0.25-0.30 % profile, and induction hardening pinion was heat treated vertically one of two Metlab ''! Steel according to the Jorgensen steel Book load corresponds to 2,667 shafts material... Measurements are important for quality control of surface-hardened steel parts and batches carburizing for... Flame hardening technique used and actual chemistry of the case depth mechanical properties, or both, are by! Increases with decreasing carbon content, as then less brittle cementite is found in the surface layer as. Measurements are important for quality control of surface-hardened steel parts and batches less. Is also the same, and cost when you need them at equal carbon curves in microstructure... By 180 '' deep pit furnaces weighs approximately 24,000 pounds hardness and case depth for high-performance metals delivery when need... A few thousandths is one of the entire surface including for the same, and.. ( consisting of heating, quenching and tempering ) to increase the metal characteristics ready for processing and when...

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