case hardening depth chart

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

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