52100 / 100Cr6 / GCR15 Bearing Steel – High-Carbon Chromium Precision Grade

52100 / 100Cr6 / GCR15 bearing steel is a high-carbon chromium precision grade material, ideal for manufacturing bearings and other critical components.

AISI 52100 bearing steel is a Alloy Bearing steel, It belong to a high carbon, chromium containing low alloy steel.

AISI 52100 Alloy bearing steel properties is a chromium,manganese alloy steel specification. 52100 is equivalent to DIN 100Cr6, GB GCr15 steel. Most applications can replace each others. normal delivery condition is annealing.

Related Specifications ASTM A29/A29M DIN EN 10083/3 JIS G4053 GB GB/T 3077

Form of Supply

AISI 52100 bearing steel, supply the round bar, steel flat bar, plate, hexagonal bar and steel square block. AISI 52100 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. 52100 bearing steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.Chemical composition

C(％)	0.95～1.10	Si(％)	0.15～0.35	Mn(％)	0.25～0.45	P(％)	≤0.015
S(％)	≤0.015	Cr(％)	1.35～1.60

Equivalent Of SAE E52100 Bearing alloy tool steel

USA	Germany	China	Japan	France	England	Italy	ISO	Czechia	Austria	Sweden	Spain
AIAI/ASTM/SAE/UNS	DIN,WN-r	GB	JIS	AFNOR	BS	UNI	ISO	CSN	ONORM	SS	UNE
E52100/ G52986	100Cr6 (W3) / 1.3505	GCr15	SUJ2	100C6	535A99		100Cr6(B1)			SKF3

Heat treatment Related

① Forging of 52100 Alloy bearing steel

AISI 52100 is forged at 927 to 1205°C (1700 to 2200°F), then annealing.

② Annealing of 52100 Alloy bearing steel

Slowly heated to 872°C (1600°F), follow by slowly cooling to reduce cold working or machining stress. Different annealing ways will get different hardness.The 52100 bearing steel will get Hardness MAX 248 HB （Brinell hardness）.

③ Quenching and temperature of 52100 Alloy bearing steel

Heated to 816°C (1500°F) slowly, Then quenching in oil get 62 to 66 HRc hardness. High temperature tempering: 650-700℃，cool in air, get hardness 22 to 30HRC. Low temperature tempering: 150-170 ℃， Cool in ari, get 61-66HRC hardness.

④Hot work and cold work of 52100 Alloy bearing steel

AISI 52100 steel can hot worked at 205 to 538°C (400 to 1000°F), 52100 Bearing steel can be cold worked using conventional techniques in the annealed or normalized conditions.

Mechanical Properties

The mechanical properties of annealed AISI 52100 bearing steel (typical for steel) are outlined in the table below:

Tensile	Yield	Bulk modulus	Shear modulus	Poisson’s ratio	Thermal conductivity
MPa	Mpa	Gpa	Gpa		W/mK
520	415 Min	140	80	0.27-0.30	46.6

Applications

AISI 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.

Regular size and Tolerance of E52100 bearing steel

Steel round bar: Diameter ? 5mm – 3000mm

Steel plate: Thickness 5mm – 3000mm x Width 100mm – 3500mm

Steel Flat bar: 5mm – 105mm

1) Hot Rolled round bar
Diameter (mm)	Diameter Tolerance (mm)	Diameter (mm)	Diameter Tolerance (mm)
≤12.70	-0.13 ～0.30	>50.80～63.5	-0.25～0.76
12.7～25.40	-0.13～0.41	>63.50～76.20	-0.25～1.02
>25.4～38.10	-0.15～0.51	>76.20～101.60	-0.30～+1.27
>38.1～50.80	-0.20～0.64	>101.60～203.20	-0.38～3.81

2) Hot Rolled steel plate
Thickness (mm)	Thickness Tolerance (mm)	Thickness (mm)	Thickness Tolerance (mm)
≤25.4	-0.41～0.79	>127～152	-1.60～2.39
>25.4～76	-0.79～1.19	>178～254	-1.98～3.18
>76～127	-1.19～1.60	>254～305	-2.39～3.96

Others 52100 have not specified size, pls contact our experienced sales team.

ProcessingAISI 52100 bearing steel round bar and flat sections can be cut to your required sizes. 52100 bearing steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. AISI 52100 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

Product Specifications

Product Date 2026
Delivery cycle within 1 month
Customize Support
Price Quotation
Exit Support
OEM Quotation
Supplier China SAE Special Steel
Delivery Method Land transport/Ocean transport, etc.
User Manual provide
Shippable Areas Southeast Asia and Global

Procurement Recommendation

52100 / 100Cr6 / GCR15 bearing steel: high-carbon chromium precision grade; verify hardness HRC 60鈥?4, cleanliness level, and heat treatment records (for reference only).

Due to market conditions, product updates, and policy changes, please contact the supplier for the latest information.