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Grade introduction: 
SAE 52100 bearing steel is a high-quality Alloy Bearing steel, It belongs to high carbon, chromium-containing low alloy steel. SAE 52100 Oil Quenched & Tempered Hardness is 28-34 HRC. SAE 52100 steel Annealing delivery hardness less than 250HB.
SAE 52100 Alloy bearing steel properties is a chromium, manganese alloy steel specification. SAE 52100 is equivalent to DIN 100Cr6, GB GCr15 steel. Most applications can replace each other.
 
Grade application : 
SAE 52100 steel is widely used for a variety of applications in the used to the bearings in rotating machinery.
Typical applications such as valve bodies, pumps, and fittings, the high load of a wheel, bolts, double-headed bolts, gears, internal combustion engine. Electric locomotives, machine tools, tractors, steel rolling equipment, boring machine, railway vehicle, and mining machinery transmission shaft on the steel ball, roller and shaft sleeve, etc.
 
Equivalent grades : 
CountryUSAGermanJapanBritish
StandardASTM A295DIN 17230JIS G4805BS 970
Grades52100100Cr6/1.3505SUJ2535A99/EN31
 
Addition to other grades
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, OHNS, HCHCR, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, S40C, S355J2G3.
 
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Chemical composition: 
StandardGradeCMnPSSiNiCrCuMo
ASTM A295521000.93-1.050.25-0.450.0250.0150.15-0.350.251.35-1.600.300.10
DIN 17230100Cr6/1.35050.90-1.050.25-0.450.0300.0250.15-0.350.301.35-1.650.30
JIS G4805SUJ20.95-1.100.500.0250.0250.15-0.351.30-1.60
BS 970535A99/EN310.95-1.100.40-0.700.10-0.351.20-1.60
 
Mechanical properties :
QuantityValueUnit
Young’s modulus200000 – 20000MPa
Tensile strength650 – 880MPa
Elongation8 – 25%
Fatigue275 – 275MPa
Yield strength350 – 350MPa

Hardness:
Hardness, Brinell
Hardness, Knoop (converted from Rockwell C hardness)875875
Hardness, Rockwell C (quenched in oil from 150°C tempered)6262
Hardness, Rockwell C (quenched in water from 150°C tempered)6464
Hardness, Rockwell C (quenched in oil)6464
Hardness, Rockwell C (quenched in water)6666
Hardness, Vickers (converted from Rockwell C hardness)848848
Heat treatment properties : 
SAE 52100 alloy bearing steel is heated at 816°C followed by quenching in oil. Before performing this process, it is subjected to normalizing heat treatment at 872°C followed by slowly cooling in order to reduce the machining stress.
 
Hardening : 
SAE 52100 alloy steel is hardened by cold working, or heating and quenching. It can be carburized at 913°C (1675°F) followed by quenching. It is again heated at 788°C (1450°F) followed by quenching for the second time.
 
Tempering :
Temper to desired hardness as indicated by tempering curves after water or oil quench.
 
Physical properties : 
PropertiesMetricImperial
Density7.81 g/cm30.282 lb/in³
Melting point1424°C2595°F
 
Thermal properties:
PropertiesMetricImperial
Thermal expansion co-efficient (@ 23-280°C/73.4- 36°F, annealed)11.9 µm/m°C6.61 µin/in°F
Thermal conductivity (typical steel)46.6 W/mK323 BTU in/hr.ft².°F
 
Forging properties :
AISI 52100 alloy steel is forged at 927 to 1205°C, and should not be forged below 925ºC. A post-forge equalization treatment is recommended at 745ºC for 4-6 hours followed by air cooling for SAE/AISI 52100 steel.
 
Stress relieving : 
Heat it up to 600-700℃, stay the temperature, furnace cooling. The need for the hardness of mold steel is 187-229HBS. The characters remove the work hardening and residual stress.
Normalizing : 
Heat it until the temperature at the range of 930-950℃, maintain the temperature, air cooling. The hardness needs to be 302-388HBS.
Annealing:
AISI 52100 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling to reduce cold working or machining stress
 
Density :
PropertiesMetricImperial
Density7.81 g/cm30.282 lb/in³
 
Machinability : 
SAE 52100 alloy steel can be machined using conventional techniques. The machinability of this steel can be improved by performing sherardizing annealing process at 649°C (1200°F) before machining.
 
Welding:
This is a high carbon alloy typically used in bearing applications where welding is not applicable or appropriate.
 
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