China · GB

Grade B

GB/T 31944:2015 — Corrosion resistant steel plates for cargo oil tanks

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Standards

GB 712:2000Ship and ocean engineering structural steel
GB 712:2011Ship and ocean engineering structural steel
GB/T 9945:2012Hot-rolled bulb flats
GB/T 9945:2001Hot-rolled bulb flats
GB/T 34103:2017Hot rolled H section steel for ocean engineering structure
GB/T 31944:2015Corrosion resistant steel plates for cargo oil tanks
GB/T 33976:2017Corrosion resistant hot rolled section steel for cargo oil tanks
GB 712:1988Ship and ocean engineering structural steel
GB 9945:1988Bulb flat steel for shipbuilding

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Chemical composition

wt% · log scale

min – max range
typical value

Mechanical properties

value range by condition

Chemical composition

Element	min	max	Similar	Remarks
C		0.21
Mn	0.8
Nb+V+Ti		0.12
P		0.02
S		0.01
Si		0.35

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
steel plates	≥235	400–520	≥22

High/low temperature

Impact energy Kv/Ku (J)

Condition	Temperature ℃	min
steel plates ( transverse )	0	27
steel plates ( longitudinal )	0	31