SAE 52100 Alloy Steel | SAE 52100 Forging | SAE 52100 Flat - SBSI

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Grade introduction:

SAE 52100 bearing steel is a high quality Alloy Bearing steel, It belong to a 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 others.

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 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 :

*Country*	*USA*	*German*	*Japan*	*British*
*Standard*	*ASTM A295*	*DIN 17230*	*JIS G4805*	*BS 970*
*Grades*	*52100*	*100Cr6/1.3505*	*SUJ2*	*535A99/EN31*

Addition to other grades

MS, EN1a, EN3b, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, En47, EN353, IS2062, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, 2714, SKD-11, P20, P20+s, P20+Ni, ASTM Sa-36, ASTM SA-105, SAE 1018, SAE 4140, SAE 8620, SCM420, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, 42CrMo4, S40C, S355J2G3.

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Chemical composition:

*Standard*	*Grade*	C	Mn	P	S	Si	Ni	Cr	Cu	Mo
*ASTM A295*	*52100*	*0.93-1.05*	*0.25-0.45*	*0.025*	*0.015*	*0.15-0.35*	*0.25*	*1.35-1.60*	*0.30*	*0.10*
*DIN 17230*	*100Cr6/1.3505*	*0.90-1.05*	*0.25-0.45*	*0.030*	*0.025*	*0.15-0.35*	*0.30*	*1.35-1.65*	*0.30*	–
*JIS G4805*	*SUJ2*	*0.95-1.10*	*0.50*	*0.025*	*0.025*	*0.15-0.35*	–	*1.30-1.60*	–	–
*BS 970*	*535A99/EN31*	*0.95-1.10*	*0.40-0.70*	–	–	*0.10-0.35*	–	*1.20-1.60*	–	–

Mechanical properties :

*Properties*	*Metric*	*Imperial*
*Bulk modulus (typical for steel)*	*140 GPa*	*20300 ksi*
*Shear modulus (typical for steel)*	*80 GPa*	*11600 ksi*
*Elastic modulus*	*190-210 GPa*	*27557-30458 ksi*
*Poisson’s ratio*	*0.27-0.30*	*0.27-0.30*
*Hardness, Brinell*	–	–
*Hardness, Knoop (converted from Rockwell C hardness)*	*875*	*875*
*Hardness, Rockwell C (quenched in oil from 150°C tempered)*	62	62
*Hardness, Rockwell C (quenched in water from 150°C tempered)*	64	64
*Hardness, Rockwell C (quenched in oil)*	64	64
*Hardness, Rockwell C (quenched in water)*	66	66
*Hardness, Vickers (converted from Rockwell C hardness)*	*848*	*848*
*Machinability (spheroidized annealed and cold drawn. Based on 100 machinability for AISI 1212 steel)*	40	40

Hardness:

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 :

*Properties*	*Metric*	*Imperial*
*Density*	*7.81 g/cm3*	*0.282 lb/in³*
*Melting point*	*1424°C*	*2595°F*

Thermal properties:

*Properties*	*Metric*	*Imperial*
*Thermal expansion co-efficient (@ 23-280°C/73.4- 36°F, annealed)*	*11.9 µm/m°C*	*6.61 µin/in°F*
*Thermal conductivity (typical steel)*	*46.6 W/mK*	*323 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 reliving :

Normalizing :

Annealing:

AISI 52100 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling to reduce cold working or machining stress

Density :

*Properties*	*Metric*	*Imperial*
*Density*	*7.81 g/cm³*	*0.282 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:

Supply cities

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