Grade A Shipbuilding steel plate

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24-May-2024

Grade A steel plate is used for shipbuiling's hull structure and platform. The shipbuilding steel plate grade A is the common tensile strength steel. It has good toughness properties and higher strength, strong corrosion-resistance,the processing properties,and welding properties. ASTM A131 Grade A steel plate can be used in the manufacture of the ship's hull structure whose weight is below 10000 tons,and usually do navigation around coastal and river area.

Grade A shipbuiling steel plate specification:
Thickness: 4mm to 260mm,
Width: 1200mm to 4000mm
Length: 3000mm to 18000mm.

Grade A steel plate Chemical Composition

Grade	C max	Si max	Mn	P max	S max
Grade A	0.21	0.50	≥ 2.5C	0.035	0.035

Note: CE: C+1/6Mn ≤ 0.40%
Cu ≤ 0.35%,Ni ≤ 0.30%≤

Grade A steel plate Mechanical Property

Grade	Rm (MPa)	Re(MPa) min	A% min	Akv/J min
Grade A	400-520	235	22	E.T °C	Thickness (mm)
				20	≤50		>50-70		>70-100
					L	C	L	C	L	C
					-	-	34	24	41	27

Note: In the list , Rm: tensile strength,Re: Yield strength,A%: elongation, E.T: experimental temperature,L: lengthways, C: crosswise.

Condition Of Delivery

Grade	category	The thickness of steel
		≤12	>12.5-25	>25-35	>35-50	>50-100
Grade A	Plate/sheet	A(-)				N(-),TM(-) CR(50) AR*(50)
	Profile steel					-

Note: 1. delivery condition: A =Any ; N=Normalized ; CR=Control Rolled ; TM=TMPC,Temperature - deformation control rolling; AR*= Can be hot rolled with the agreement of Classification Society ; CR*=Can be control rolled with the agreement of Classification Society.

2.The Figure in the ( ) means the sampling volume to do the impact test, the unit isTon.(-) means without impact test.Contrast in the different standard

ASTM A131M	TOCT 5521	JIS G3106	BS LR	GB712
Grade A	A	SM400A	A	A

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