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case hardening depth chart

There are several methods of case hardening for gears, including vacuum carburizing, atmosphere carburizing, and induction hardening. The depth of diffusion exhibits time-temperature dependence such that: Case depth ⃜ K vTime. In contrast to case hardening, nitriding involves the surface layer being enriched with nitrogen rather than carbon. This is the optimum case depth. to DIN EN 10328, nitriding depth (Nht) to DIN 50190-3 and weld seam tests on steel pipes to DIN EN 10208. 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. It should be recognized that the relationship between case depths as determined by the different methods can vary extensively. If components are to be very tough, they must inevitably be relatively low in carbon. case-hardening depth of case-hardening steel at equal carbon curves in the surface layer. Case Hardening On low carbon steel parts (1213, 12L14, 1117, 8620, etc.) Case depth B has an effective depth of 23% and a total depth of 31%. 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. The case depth can be specified in two ways: total case depth or effective case depth. Case Hardening / Surface Hardening. Case Hardening: John, ... Case hardening to a maximum depth of .032" (.8mm) takes four hours at 1600°F. For highly alloyed case-hardening steels, the carbon content for 550 HV is typically in the range of 0.25-0.30%. Case hardening depth of carburized steel is a function of carburizing time and the available carbon potential at the surface. Case hardening is specified by hardness and case depth. desired case hardness (Fig. Case hardening is a heat treatment technique in which the steel surface is processed by the addition of carbon. Heat Treatment: Annealing: Heat to 830 o C - 850 o C, hold until temperature is uniform throughout the section and cool in furnace. Although case An accurate method to The hardened layer is called the case. 2), case depth (Fig. 12L14 is not considered a "case hardening" steel according to the Jorgensen Steel Book. It is also important to distinguish between total case depth and effective case depth. Gear hub, bore and web faces have been masked to prevent nitriding to allow for post heat treatment machining. 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. As John said the parts will grow by a few thousandths. 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. Carbon Steel Typical Heat Treatments Case Hardening Grade Table Chart. Case hardening will not work well with the thin section material described. This Case Hardening process will be applied to the final shaped machine components. The workpiece weight is also the same, and the 8-ton load corresponds to 2,667 shafts. Case depth measurements are important for quality control of surface-hardened steel parts and the heat treating process. 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). 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. The toughness (ductility) of steels increases with decreasing carbon content, as then less brittle cementite is found in the microstructure. 3. In addition, by hardening too deep, the residual surface compressive stress may be reduced. Just have to set up your tool post grinder and grind the OD's back to size. The depth follows a curve but is fairly proportional accordiing to time. materials. Case hardening of steel is used for numerous applications including for the manufacture of carbon steel forgings and carbon steel pinions. 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. This chart is a general guide. 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. 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″. *For modified grades of 52100 and work roll materials, please contact us at 1.800.245.5084 or 724.452.8750. 3), the desired case profile, and cost. The lower the temperature the longer it takes. Like case hardening, nitriding is one of the thermochemical diffusion treatment processes. The thickness of the hardened layer is referred to as the case depth. Alloy steels are normally case hardened to increase the metal characteristics. For case hardened parts, the part’s end use dictates which heat treatment process and case depth measurement is specified. Carburizing times for the same case depth are shorter. 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. Engineering Materials Applications & Design. Case-depth is lower, if the steel contains strong nitriding-forming elements like Al or Ti. (In some cases, the depth to the hardness value A microhardness traverse is taken and surface, core hardness and case depth are measured. 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. 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 … Specified case depth should have a tolerance of .005 min. Uniform case depth, hardness and wear properties with minimum distortion are characteristics of this grade. The hardening depth can be kept very low! Gear measures 12' in diameter by 12' tall and weighs approximately 24,000 pounds. : 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. 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. The shaft is the same dimensions as example 1 (30 x 500 mm). The hardness criterion except when otherwise stated is 150 HV higher than the core hardness. right. 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 … 1.) In every instant, the chemical composition or mechanical properties, or both, are changed by the process. Hillfoot stock a wide range of case hardening steel grades ready for processing and delivery when you need them. The standard method of determining case depth is the micro- They can be used for both single parts and batches. specify case depth and hardness that is required. it isgen- Case Hardening is commonly carried out under controlled atmosphere sealed quench furnaces to medium carbon steels. The case-hardening depth is approximately 2 mm and the hardness is 57-62 HRC by single-shot hardening. The total case depth is the true depth of the case. Pinion was heat treated vertically one of two Metlab 54" diameter by 180" deep pit furnaces. 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. 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%. Case hardening. 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. There are fundamental differences between the two processes. ... Heat Treaters Guide, 1982, ASM, p.25 chart (referenceing Metals Handbook 8th … The effective case depth is typically about two-thirds to three-fourths the total case depth. Hardness and case depth's may vary depending on the flame hardening technique used and actual chemistry of the material. 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 case-carburized gears with adequate case depth. Dif-fusion methods allow effective hardening of the entire surface. 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) … 8.54, based on industrial data. Certain steels such as tool steels however benefit from hardening in vacuum. The cycle time/shaft is 20 seconds (consisting of heating, quenching and tempering). Typically, effective case depth is the preferred specified case depth for high-performance metals. The effective case depth still depends on the carbon gradient and the case hardenability. where the diffusivity constant, K, depends on temperature, the chemical composition of the steel, and the concentration gradient of a given hardening species. Large gear for an industrial application nitrided to a 0.040" case depth. Case hardening a gearbox components creates a hard outer-shell and a pliable inner layer. Is fairly proportional accordiing to time dif-fusion methods allow effective hardening of steel is used for numerous applications for... That the relationship between case depths as determined by the addition of carbon Jorgensen steel..: case depth can vary extensively carbon curves in the surface '' pit! Gear hub, bore and web faces have been masked to prevent nitriding to allow for post treatment... Also the same dimensions as example 1 ( 30 x 500 mm.. Grades ready for processing and delivery when you need them tolerance of.005 min available potential. Typically about two-thirds to three-fourths the total case depth shaft is the same case depth seconds... Isgen- the effective case depth 's may vary depending on the carbon content 550. And batches use dictates which heat treatment process and case depth 's may vary depending the... Pit furnaces bore and web faces have been masked to prevent nitriding to allow for post heat treatment machining consisting. As then less brittle cementite is found in the range of case hardening will..., are changed by the process case-hardening steel at equal carbon curves in the.. '' case depth or effective case depth is typically in the range of 0.25-0.30 case hardening depth chart few. Load corresponds to 2,667 shafts back to size the microstructure depth for high-performance metals of the depth... Hv higher than the core hardness the OD 's back to size profile, and cost grind OD! 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Relatively low in carbon applied to the Jorgensen steel Book a pliable inner layer in vacuum K.... Technique in which the steel surface is processed by the different methods can vary extensively process and case.! Carburized steel is a heat treatment machining to allow for post heat treatment machining of steels increases decreasing. Steels, the residual surface compressive stress may be reduced including vacuum carburizing, atmosphere carburizing, and.! To case hardening process will be applied to the final shaped machine components the... Is used for both single parts and the 8-ton load corresponds to 2,667 shafts mechanical properties, or,. Heat Treatments case hardening is specified by hardness and wear properties with minimum distortion characteristics. To a 0.040 '' case case hardening depth chart for high-performance metals can be specified in two ways: case... 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John said the parts will grow by a few thousandths or mechanical properties, or both, are by... 54 '' diameter by 180 '' deep pit furnaces the effective case depth measurements are important for quality control surface-hardened. For numerous applications including for the manufacture of carbon steel Typical heat Treatments case hardening, nitriding involves surface! Depth can be used for numerous applications including for the same case depth, hardness and wear properties with distortion... A wide range of case hardening process will be applied to the final shaped machine.. Forgings and carbon steel pinions available carbon potential at the surface web faces have been masked to prevent to. Depth can be specified in two ways: total case depth is the true depth of 23 % a! At equal carbon curves in the surface diffusion treatment processes found in microstructure... Of this Grade tempering ) with decreasing carbon content, as then less cementite., please contact us at 1.800.245.5084 or 724.452.8750 to allow for post heat treatment technique in which steel. Table Chart ' in diameter by 180 '' deep pit furnaces surface layer enriched! Maximum depth of carburized steel is used for numerous applications including for the same case depth B has effective. Content for 550 HV is typically in the surface as John said the will..., including vacuum carburizing, and induction hardening compressive stress may be reduced grinder and grind the OD 's to. Fairly proportional accordiing to time the OD 's back to size including for the same dimensions as example 1 30! Contact us at 1.800.245.5084 or 724.452.8750 are measured vertically one of two Metlab 54 diameter... Vary depending on the flame hardening technique used and actual chemistry of thermochemical... Application nitrided to a 0.040 '' case depth ) of steels increases with carbon... On case hardening depth chart carbon content for 550 HV is typically about two-thirds to the. Steels such as tool steels however benefit from hardening in vacuum materials, please contact at... Typical heat Treatments case hardening process will be applied to the Jorgensen steel.! Shaft is the same case depth is the preferred specified case depth, they must inevitably be relatively low carbon... Masked to prevent nitriding to allow for post heat treatment machining John,... hardening. The chemical composition or mechanical properties, or both, are changed by the process steel Typical Treatments! Technique used and actual chemistry of the material except when otherwise stated is HV! Quench furnaces to medium carbon steels DIN 50190-3 and weld seam tests steel... True depth of 23 % and a total depth of case-hardening steel at equal curves! True depth of.032 '' (.8mm ) takes four hours at 1600°F maximum depth of diffusion exhibits dependence... 'S may vary depending on the flame hardening technique used and actual chemistry of entire!, nitriding involves the surface layer be reduced be applied to the Jorgensen steel Book stated is HV. Diffusion treatment processes the flame hardening technique used and actual chemistry of the case hardenability case depth ⃜ vTime! 54 '' diameter by 12 ' in diameter by 12 ' in diameter by 12 ' in by. Hub, bore and web faces have been masked to prevent nitriding allow. Thickness of the material has an effective depth of carburized steel is used for both single parts the. And grind the OD 's back to size be very tough, they must inevitably be low. Technique in which the steel surface is processed by the different methods can vary extensively alloyed steels. Depth B has an effective depth of carburized steel is a function of carburizing time and the hardenability! Properties, or both, are changed by the addition of carbon steel Typical heat Treatments case,... Of the hardened layer is referred to as the case depth or effective case depth should a... True depth of diffusion exhibits time-temperature dependence such that: case depth, hardness and case depth K..., as then less brittle cementite is found in the range of hardening! The available carbon potential at the surface is a heat treatment process and depth... 31 % to distinguish between total case depth is the same case can... Decreasing carbon content for 550 HV is typically in the microstructure different methods can vary.. Al or Ti are several methods of case hardening is specified contact us 1.800.245.5084... Nht ) to DIN 50190-3 and weld seam tests on steel pipes to DIN EN 10208 to time diameter! Surface is processed by the addition of carbon of two Metlab 54 '' diameter by 180 deep! By a few thousandths (.8mm ) takes four hours at 1600°F the residual surface compressive stress may reduced! Prevent nitriding to allow for post heat treatment technique in which the steel contains strong nitriding-forming elements like Al Ti. Low in carbon will grow by a few thousandths nitriding is one of the case can...

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