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9Cr18, 9Cr18Mo stainless steel ball

9Cr18 is high carbon and high chromium martensite stainless bearing steel. After quenching, it has high hardness and wear resistance, high dimensional stability, generally used after quenching and tempering.

9Cr18Mo has the same characteristics and application as 9Cr18 steel, but has higher hardness and stability after quenching. Molybdenum can increase the passivation effect of stainless steel.


 9Cr18, 9Cr18Mo material chemical composition

Steel grade

Carbon

Manganese

Silicon

Chromium

Nickel

Copper

Sulfur

Phosphorus

Molybdenum

Stainless steel 9Cr18

0.90/1.00

≤0.70

≤0.80

17.0/19.0

≤0.60

 

≤0.030

≤0.030

 

Stainless steel 9Cr18Mo 

1.00/1.10

≤0.80

≤0.50

16.0/18.0

 

 

≤0.030

≤0.030

0.40-0.70

 9Cr18, 9Cr18Mo material mechanical properties

Heat treatment

σb Mpa

σs %

Ψ%

HRC/HBW

Quenching and tempering state

---

---

---

≥58 HRC

Annealing state

755

14

27.5

230-240 HBW

 9Cr18, 9Cr18Mo High carbon chromium stainless steel ball specifications

Nominal diameter of steel ball

Nominal diameter of steel ball

Nominal diameter of steel ball

mm

in

mm

in

mm

in

0.5

 

0.6

 

0.794

1/32

0.8

 

1

 

1.588

1/16

2

 

2.381

3/32

2.5

 

2.778

7/64

3

 

3.175

1/8

3.5

 

3.969

5/32

4

 

4.5

 

4.762

3/16

5

 

5.159

13/64

5.5

 

5.953

15/64

6

 

6.35

1/4

6.5

 

6.747

17/64

7

 

7.144

9/32

7.5

 

7.938

5/16

8

 

8.5

 

9

 

9.525

3/8

10

 

11.112

7/16

12

 

12.303

31/64

12.7

1/2

13.494

17/32

14.288

9/16

15.081

19/32

15.875

5/8

16.669

21/32

17.462

11/16

18.256

23/32

19.05

3/4

20.638

13/16

22.225

7/8