Bearing Materials and Heat Treatment

Serial number

China

Germany

France

ISO

Japan

Russia

Sweden

U.K.

USA

JIS

ГОСТ

SKF

BS

GB

DIN

W-Nr.

NF

ASTM/AISI

UNS.

High carbon chromium bearing steel

1

GCr6

100Cr2(W1)

1.3501

100C2

－

－

щх6

SKF9

－

50100

G50986

E50100

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

100CrMn6(W4)

1.3502

100Cm6

3

－

щх15гс

SKF2

－

－

－

Carburized bearing steel

6

G20CrMo

20MoCr4

1.7321

－

－

－

－

－

－

A534 4118H

－

7

G20CrNiMo

21NiCrMo2

1.6523

20NCD2

12

SNCM220

－

SKF152

805A20

A534 8620H

－

8

G20CrNi2Mo

－

－

20NCD7

14

SNCM420

20хн2м

－

－

A534 4320H

－

(20хнм)

9

G20Cr2Ni4

－

－

－

－

－

20х2н4A

－

－

－

－

10

G10CrNi3Mo

－

－

－

－

－

－

－

832H13

A534 9310H

－

Stainless bearing steel

11

9Cr18

－

－

－

－

SUS 440C

95х18

－

－

－

－

12

9Cr18Mo

X102CrMo17

1.3543

Z100CD17

21

SUS 440C

－

SKF577

－

A756 440C

－

STORA-577

Steel No.

Process Name

Key points of technology

Hardness（HBS）

9Cr18

Annealing

Keep at 800~840℃ for 3-6h, cool to 700℃ at 10~30℃/h, keep at 3-6h, cool to 600℃ at less than 90℃/h, and air cool out of the furnace

 >

Normalizing

Keep at 850~870℃ for 3-6h, cool to 600℃ at a rate of less than 90℃/h, and air cool out of the furnace

9Cr18Mo

Annealing

Keep at 850~870℃ for 3-6h, cool to 700℃ at 10~30℃/h, keep at 3-6h, cool to 600℃ at less than 90℃/h, and air cool out of the furnace

≤255

Normalizing

Keep at 850~870℃ for 4-6h, cool to 600℃ at a rate of less than 30℃/h, and air cool out of the furnace

GCr6

Annealing

Keep at 790~810℃ for 3-6h, 10~30℃/h, cool to 600℃, air cool after leaving the furnace

Normalizing

900~950℃ insulation followed by air cooling, large parts air cooling

GCr9

Annealing

Keep at 790~810℃ for 2-6h, cool to below 650℃ at 10~30℃/h, then air cool out of the furnace

179~207

Isothermal annealing

Keep at 790~810℃ for 2-6h, cool to 710~720℃ for 1-2h, cool to below 650℃, and air cool out of the furnace

207~229

Normalizing

900~950℃ insulation for 1-2h, dispersed air cooling, large forgings air cooling

270~390

High temperature tempering

650~700℃ insulation followed by air cooling

229~285

GCr15

Annealing

Keep at 790~810℃ for 2-6h, cool to below 650℃ at 10~30℃/h, then air cool out of the furnace

170~207

Isothermal annealing

Keep at 790~810℃ for 2-6h, cool to 710~720℃ for 1-2h, cool to below 650℃, and air cool out of the furnace

207~229

Normalizing

900~950℃ insulation for 1-2h, dispersed air cooling, large forgings air cooling

270~390

High temperature tempering

650~700℃ insulation followed by air cooling

229~285

GCr15SiMn

Annealing

Keep at 790~810℃ for 2-6h, cool to below 600℃ at 10~30℃/h, then air cool out of the furnace

179~207

High temperature tempering

Keep at 790~810℃ for 2-6h, cool to 710~720℃ for 1-2h, then air cool out of the furnace

207~229

Normalizing

Keep at 900~950℃ for 10~90min, then air cool after leaving the furnace

270~390

G20Cr2Ni4A

Annealing

800~900℃, furnace cooling

≤269

Softening annealing

680~700℃, air cooling

≤321

Normalizing

890~920℃, air cooling

High temperature tempering

640~670℃ insulation for 4-6h, air cooling

≤269

Cr14Mo4V

Annealing

Keep at 880~1000℃ for 4-6h, cool to 740℃ at 15~30℃/h, cool to 600℃ at 15~30℃/h, keep at 2-5h, then air cool out of the furnace

197~241

9Cr18Mo

Annealing

Keep at 850~870℃ for 4-6h, cool to 600℃ at 30℃/h, and air cool out of the furnace

≤255

Steel No.

Quenching

Tempering

Heating temperature(℃)

Cool down

Hardness（HRC）

Tempering method

Hardness（HRC）

Way

9Cr18

800~850(Preheat)

Oil

 >

150~160℃3h, air cooling

≥60

1060~1080

9Cr18Mo

800~850(Preheat)

Oil

150~160℃2~5h, air cooling, tempering 4 times

≥58

1050~1100

GCr6

810~830

Oil

Heat in oil furnace at 150~170℃ for 2~5h, air cool

62~65

780~815

Water

GCr9

815~830

Oil

≥63

Heat in oil furnace at 150~170℃ for 2~5h, air cool

62~65

GCr15

835~850

Oil

≥63

Heat in oil furnace at 150~170℃ for 2~5h, air cool

61~65

GCr9SiMn

800~840

Oil

≥63

Heat in oil furnace at 150~180℃ for 2~5h, air cool

≥62

GCr15SiMn

820~840

Oil

≥63

Heat in oil furnace at 150~180℃ for 2~5h, air cool

≥62

G20Cr2Ni4A

790~810

Oil

160~180℃ oil furnace heating for 6~12h, air cooling

≥58

Cr14Mo4V

800~850(Preheat)

Oil

500~520℃2h, air cooling, tempering 4 times

61~63

1100~1120

Steel No.

Heat treatment

Performance

σb（MPa）

Ak（J）

HRC

9Cr18

Preheat at 860℃, quench and heat at 1060~1080℃, cool to room temperature after quenching, cold treatment at -78℃, temperature rises to room temperature, temper at 160℃ for 3h

1552

21

63

9Cr18Mo

Preheat at 860℃, quench and heat at 1055~1065℃, cool to room temperature after quenching, cold treatment at -78℃, temperature rises to room temperature, temper at 160℃ for 3h

1504

37

61

GCr15

850~860℃ quenching heating, oil cooling, 160℃ tempering for 2h

1617

28

61~64

GCr15A

850~860℃ quenching heating, oil cooling, 160℃ tempering for 2h

1902

26

63

GCr15SiMn

830~840℃ quenching heating, oil cooling, 160℃ tempering for 3h

1813

23

65

GCr15SiMnA

830~840℃ quenching heating, oil cooling, 160℃ tempering for 3h

1906

28

63

G20CrNiMo,

920±10℃ carburizing, direct oil quenching (810℃), tempering at 190℃ for 2h

1126

31

64

810℃ direct oil quenching, 190℃ tempering for 2h

862

108

32

G20CrNi2Mo

Carburizing, (880℃, oil cooling) + (790℃, oil cooling), low temperature tempering

1631

47

63

(880℃, oil cooling) + (790℃, oil cooling), low temperature tempering

1500

122

45