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NK Grade A shipbuilding steel plate

NK Grade A bulb flat steel bar specifications: 80× 5/6, 100× 7/8, 120× 6/7/8, 140× 7/8/10, 160× 7/8/9/11, 180× 8/9/10/11, 200× 9/10/1112, 220× 10/11/12, 240× 10/11/12, 260× 10/11/12, 280× 11/12/13, 300× 11/12/13, 320× 12/13/14, 340× 12/13/14, 370× 13/14/15, 400× 14/15/16, 430× 14/15/17/19/20

NK Grade A bulb flat steel bar , K A chemical composition:

Grade

C max

Si max

Mn

P max

S max

Als min

K A

0.21

0.50

≥ 2.5C

0.035

0.035

-

CE: C+1/6Mn ≤ 0.40%

Cu ≤ 0.35%,Ni ≤ 0.30%

NK Grade A bulb flat steel bar , K A Mechanical Property:

Grade

Rm

(MPa)

Re(MPa) min

A% min

Akv/J min

E.T °C

Thickness (mm)

≤ 50

>50-70

>70-100

L

C

L

C

L

C

K A

400-520

235

22

20

-

-

34

24

41

27

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