Shipbuilding steel plate
A
Grade A is the baseline normal-strength hull structural grade, specified where no low-temperature impact testing is required — general shell plating, decks and bulkheads in ambient service.
Mechanical properties
- Grade class
- Normal strength
- Minimum yield ReH
- 235 MPa
- Tensile strength Rm
- 400–520 MPa
- Elongation A5
- 22%
- Impact test temperature
- Not required
Impact energy in joules is not listed here because it varies with plate thickness and specimen orientation. The value that governs your order is the one on the mill test certificate, issued per heat.
Grade A has no mandatory Charpy V-notch impact-test requirement under IACS UR W11.
Not sure what ReH or TMCP mean? See the glossaryStock & dimensions
- Thickness
- 3–12 mm
- Widths
- 1,500 / 1,800 / 2,000 mm
- Lengths
- 6,000 / 8,000 / 10,000 mm
Also supplied as bulb flat
A is also held as bulb flat bar for hull framing.
View bulb flat availabilityClassification society approvals
Material is produced at the WISCO mill, which holds works approval from the nine classification societies below. Material is released with the mill test certificate for the relevant heat.
- CCS A
- ABS A
- DNV A
- GL A
- BV A
- LR A
- RINA A
- KR A
- NK A
Standards & cross-reference
This grade is also recognized under ASTM A131/A131M (the U.S. shipbuilding-steel specification) and GB/T 712 (the Chinese national shipbuilding-steel standard), both of which use the same A designation as the IACS classification-society rules.
General structural-steel standards such as EN 10025 (Europe) or JIS G3106 (Japan) are not classification-society approved for ship hulls and are not interchangeable with A on a classed vessel — see the grade selector page for a worked example (AH36 vs A36). AH36 vs A36
Welding & cutting
Cutting
Both oxy-fuel (flame) and plasma cutting are suitable for this thickness range; cut to your drawing or DXF file.
Welding & preheat
Readily weldable by standard shipyard procedures (SMAW, FCAW, SAW). Preheat is generally not required at typical hull-plate thicknesses, but always follow your yard's approved welding procedure specification (WPS) and classification society requirements for the specific joint and thickness.
Related grades
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