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BK

BKW

BKS

NBK

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≥

10

410

6

375

10

335

12

335

24

20

510

5

450

8

430

10

410

20

35

590

4

550

6

520

8

530

17

45

645

4

630

5

610

7

600

14

40Cr

≥784

≥12

37Mn5

≥784

≥12

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C

Si

Mn

S

P

Cr

10

0.07-0.13

0.17-0.37

0.35-0.65

≤0.035

≤0.035

20

0.17-0.23

0.17-0.37

0.35-0.65

≤0.035

≤0.035

35

0.32-0.39

0.17-0.37

0.35-0.65

≤0.035

≤0.035

45

0.42-0.50

0.17-0.37

0.50-0.80

≤0.035

≤0.035

40Cr

0.37-0.44

0.17-0.37

0.50-0.80

≤0.035

≤0.035

0.08-1.10

25Mn

0.22-0.29

0.17-0.37

0.70-1.00

≤0.035

≤0.035

≤0.25

37Mn5

0.30-0.39

0.15-0.30

1.20-1.50

≤0.015

≤0.020

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BK

BKW

BKS

NBK

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�쳤��(%)

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�쳤��(%)

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�쳤��(%)

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≥

10

410

6

375

10

335

12

335

24

20

510

5

450

8

430

10

410

20

35

590

4

550

6

520

8

530

17

45

645

4

630

5

610

7

600

14

40Cr

≥784

≥12

37Mn5

≥784

≥12

�ƺ�

��ѧ�ɷ�%

C

Si

Mn

S

P

Cr

10

0.07-0.13

0.17-0.37

0.35-0.65

≤0.035

≤0.035

20

0.17-0.23

0.17-0.37

0.35-0.65

≤0.035

≤0.035

35

0.32-0.39

0.17-0.37

0.35-0.65

≤0.035

≤0.035

45

0.42-0.50

0.17-0.37

0.50-0.80

≤0.035

≤0.035

40Cr

0.37-0.44

0.17-0.37

0.50-0.80

≤0.035

≤0.035

0.08-1.10

25Mn

0.22-0.29

0.17-0.37

0.70-1.00

≤0.035

≤0.035

≤0.25

37Mn5

0.30-0.39

0.15-0.30

1.20-1.50

≤0.015

≤0.020