cojinetebearings

Bearing Materials

The bearing rings and rolling elements of bearings are subjected to repeated heavy stress with small amount sliding, the cage must have the strength to withstand rotational vibrations and shock loads. Therefore, the materials used for the rings, rolling elements, and cages require following characteristics:

For the bearing rings and rolling elements typical considerations include hardness for load carrying capacity, fatigue resistance, under rolling contact conditions, under clean or contaminated lubrication conditions, and the dimensional stability of the bearing components.

For the cage, considerations include friction, strain, inertia forces, and in some cases, the chemical action of certain lubricants, solvents, coolants and refrigerants.

Primarily, high carbon chromium bearings steel is most widely used for bearings and rolling elements.

Carburized hardens steel from the surface to proper depth, forming a relatively soft core, this provides hardness and toughness, making the material suitable for severe shock loads.

Stainless steel is used for application requiring high corrosion resistance.

For small and medium sized bearings, pressed cages of cold or hot rolled steel with a low carbon content are used. However, depending on the application, austenitic stainless steel is also used.

Machined cages are generally used for large bearings. Carbon steel for machine structures or high-strength cast brass is frequently used for the cages.

As international products, the dimension and material of the rolling bearings have been standardized internationally. The designation of the bearings is almost equivalent though there are very little composition difference to each other.


No. CHINA
GB
GERMANY FRANCH
NF
ISO JAPAN
JIS
RUSSIA
ГОСТ
SWEDeN
SKF
UK
BS
USA
DIN W-Nr. ASTM/AISI UNS.

High-Carbon Chromium Bearing Steels

1 GCr6 100Cr2(W1) 1.3501 100C2 -- -- щх6 SKF9  -- 50100
E50100
G50986
2 GCr9 105Cr4(W2) 1.3503 100C5 -- SUJ1 щх9 SKF13 -- E51100 G51986
3 GCr9SiMn -- -- -- 2 SUJ3 -- SKF1 -- A485Cr1 --
4 GCr15 100Cr6(W3) 1.3505 100C6 1 SUJ2 щх15 SKF3 535A99 E52100 G52986
5 GCr15SiMn 100Cr6Mn(W4) 1.3502 100Cm6 3 -- щх15c SKF2 -- -- --

Carburizing Bearing Steels

6 G20CrMo 20MoCr4 1.7321 -- -- -- -- -- -- A534 4118H -- 
7 G20CrNiMo 21NiCrMo2 1.65523 20NCD2 12 SNCM220 -- SKF152 805A20 A534 8620H --
8 G20CrNi2Mo -- -- 20NCD7 14 SNCM420 20хн2м
20хнм
-- -- A534 4320H --
9 G20Cr2Ni4 -- -- -- -- -- 20х2н4A -- -- -- --
10 G10CrNi3Mo -- -- -- -- -- -- -- 823H13 A534 9310H --

Stainless Steel for Rolling Bearings

11 9Cr18 -- -- -- -- SUS440C 95X18 -- -- -- --
12 9Cr18Mo X102CrMo17 1.3543 Z100CD17 21 SUS440C -- SKF 577
STORA-577
-- A756 440C --

 

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