High carbon bearing stainless steel

Stainless steel   grade contrast

GB

JIS

AISI

DIN

7Cr17

SUS440A

440A

8Cr17

SUS440B

440B

9Cr18, 9Cr18Mo

SUS440C

440C

Grade

composition (%)

C

Si

Mn

P

S

Cr

Mo

AISI440A

0.60-0.75

≤1.00

≤1.00

≤0.040

≤0.03

16.0-18.0

≤0.75

AISI440B

0.75-0.95

≤1.00

≤1.00

≤0.040

≤0.03

16.0-18.0

≤0.75

AISI440C

0.95-1.20

≤1.00

≤1.00

≤0.040

≤0.03

 16.0-18.0

≤0.75

Heat

treatment

σb
MPa

σs
 MPa

σ5
%

    ￠
    %

HRC

ak
  100 kJ/m2

1000~1050°C quenching in oil and 200~300°C tempering in oil or  tempering in air

--

--

--

--

>58

Annealing condition

755

--

14

27.5

HB
230~240

1.57