A131 Grade A steel plate

A131 Grade A steel plate is common strength shipbuilding plate which is mainly used for built hull of vessels, ship body construction.

A131/A Chemical Composition Max % for production analysis:

A131/A general Strength Chemical Composition

Grade

The Element Max (%)

C

Si

Mn

P

S

C+Mn/6

A131/A

0.21

0.50

2.5*C

0.035

0.035

0.40

Crack Sensitivity:  Pcm = (C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B)%
Carbon Equivalent:  Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%

A131/A Mechanical Property:


Grade

Mechanical Property

Charpy V Impact Test

Thickness

Yield

Tensile

Elongation

Degree

Energy 1

Energy 2

A131/A

mm

Min Mpa

Mpa

Min  %

20

J

J

t≤50

235

400-520

21%

-

-

50<t≤70

235

400-520

21%

-

-

70<t≤100

235

400-520

21%

-

-

Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

Normally when rolling, Air rolled and Control Rolled is ok for ship plate A131 Grade A with the thickness equal and below 40 Millimeters, and for thickness above 40mm, the heat treatment shall be Normalized or TMCP, these two technical treatment would improve steel strength in yield and tensile points.

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