GB/T 712 / ASTM A131 Shipbuilding Steel Plate | Grade A/B/D/E, AH32, AH36, AH40 Series

Dual Standard Marine Steel Plate, Meet GB/T 712 And ASTM A131 Requirements For Global Shipbuilding Projects
Full Grade Coverage From Normal Strength To Ultra High Strength, Flexible Selection For Different Hull Structures
Excellent Low-Temperature Toughness, Weldability And Forming Performance, Suitable For Shipyard Fabrication
Mill Test Certificate & Classification Society Data Support, Help Smooth Project Review And Acceptance
Custom Cutting, Flattening And Processing Service Available For Shipbuilding And Offshore Projects

Product Overview

GB/T 712 / ASTM A131 shipbuilding steel plate covers a complete range of marine structural steels used in vessel hulls, decks, bulkheads, offshore platform modules and marine engineering equipment. This product series includes normal strength grades Grade A, B, D, E and high strength grades AH32, DH32, EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40, EH40, FH40.

Under the GB/T 712 / ASTM A131 system, each grade is designed with specified yield strength, tensile strength and Charpy V-notch impact properties. Normal strength grades are generally used for secondary hull structures and ship compartments, while high strength grades are selected for main hull members, heavy load parts and critical offshore structures. The grades with lower impact test temperatures are suitable for vessels operating in cold sea areas.

Our GB/T 712 / ASTM A131 marine steel plates are produced under strict material control. They provide stable mechanical properties, good weldability and reliable structural safety. We can supply plates in different thicknesses, widths and lengths, and support custom cutting, flattening, edge trimming and shot blasting services. Mill test certificates and classification-related data

Shipbuilding & Marine Steel Plate

Chemical & Mechanical Property Snapshot

Grade Group	Grade	C Max (%)	Si Max (%)	Mn Max (%)	P Max (%)	S Max (%)	Min Yield Strength (MPa)	Tensile Strength (MPa)	Min Elongation	Charpy V-Notch Impact
Normal Strength Marine Steel	Grade A	0.21	0.5	2.5	0.035	0.035	235	400–520	22%	No impact required
	Grade B	0.21	0.5	2.5	0.035	0.035	235	400–520	22%	27 J @ 0°C
	Grade D	0.21	0.5	2.5	0.035	0.035	235	400–520	22%	27 J @ -20°C
	Grade E	0.18	0.5	2.5	0.035	0.035	235	400–520	22%	27 J @ -40°C
High Strength Marine Steel	AH32 / DH32 / EH32	0.18	0.5	1.6	0.035	0.035	315	440–570	21%	31 J @ 0°C / -20°C / -40°C
	AH36 / DH36 / EH36	0.18	0.5	1.6	0.035	0.035	355	490–630	21%	34 J @ 0°C / -20°C / -40°C
	AH40 / DH40 / EH40	0.18	0.5	1.6	0.035	0.035	390	510–660	20%	39 J @ 0°C / -20°C / -40°C
Notes: Chemical composition and mechanical properties comply with GB/T712 and ASTM A131 standards.EH grades are designed for low-temperature Arctic marine working conditions.All plates can be supplied with ship classification certificates upon request, including CCS, ABS, DNV, BV, LR, etc.

Detailed Technical Specifications

Category	Item
Product Name	GB/T 712 / ASTM A131 Shipbuilding Steel Plate
Product Type	Hot Rolled Marine Structural Steel Plate
Applicable Standards	GB/T 712, ASTM A131
Material Application	Ship hull, deck, bulkhead, offshore platform module, marine engineering equipment
Normal Strength Grades	Grade A, Grade B, Grade D, Grade E
High Strength Grades	AH32/DH32/EH32, AH36/DH36/EH36, AH40/DH40/EH40
Thickness Range	6–150mm
Width Range	900–4800mm
Length Range	3000–12000mm
Processing Service	Customized cutting and flattening according to customer requirements
Mechanical Performance	Reliable low-temperature impact strength, stable mechanical properties, high tensile strength, and load-bearing capability
Surface & Processing Performance	Uniform surface quality, good weldability, and cold forming performance
Corrosion Resistance	Excellent seawater corrosion resistance for long-term marine environments
Quality Documentation	Factory inspection certificate and qualification documents available for project inspection
Main Applications	Ship hulls, ship decks, cabin load-bearing structures, cargo ships, yachts, barges, and offshore drilling platform auxiliary structures
MOQ	5 Tons
Trade Terms	FOB, CFR, CIF, DAP, DDP
Payment Terms	T/T, L/C at sight, Negotiable for bulk long-term orders

Product Comparison Table

Product Series	Grades	Strength Characteristics	Recommended Applications
Normal Strength Marine Steel Plate	Grade A / B / D / E	Reliable low-temperature impact strength and general structural performance	Ship compartments, hull auxiliary structures, general marine structures
AH32 Series Marine Steel Plate	AH32 / DH32 / EH32/FH32	Higher strength with improved load-bearing capability	Vessel structural components and marine engineering projects
AH36 Series Marine Steel Plate	AH36 / DH36 / EH36/FH36	High tensile strength for heavy-load structures	Ocean-going vessels and major ship structures
AH40 Series Marine Steel Plate	AH40 / DH40 / EH40/FH40	Enhanced strength for core load-bearing components	Large vessels and demanding offshore structures
Marine Standard Steel Plate	GB/T 712/ ASTM A131	International marine steel specification compliance	Global shipbuilding and offshore engineering projects

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Hull Deck

Hull Shell

Cabin Structure

Ocean Cargo Ship

Yacht

Offshore Platform Auxiliary Structure

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What grades are covered under GB/T 712 and ASTM A131 shipbuilding steel?

GB/T 712 and ASTM A131 cover normal strength grades Grade A, B, D, E and high strength grades AH32, DH32, EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40, EH40, FH40.

Can I order different grades from GB/T 712 / ASTM A131 series in one shipment?

Yes. We support mixed grade orders, allowing you to combine normal strength and high strength marine plates in one bulk shipment.

What grades are available for shipbuilding steel plate?

Available grades include A/B/D/E normal strength grades and AH32, DH32, EH32, AH36, DH36, EH36, AH40, DH40, and EH40 high-strength grades.

Do you provide classification society documents for GB/T 712 / ASTM A131 steel plates?

We provide mill test certificates and material data suitable for classification review. Formal survey documents depend on your project requirements and final mill arrangement.

What is the minimum order quantity for GB/T 712 / ASTM A131 shipbuilding steel?

Our standard MOQ is 5 metric tons. For trial orders or special project requirements, smaller quantities can be discussed based on available sizes.

Can these plates be used for both Chinese and international shipbuilding projects?

Yes. GB/T 712 and ASTM A131 are widely accepted marine material standards. They can be used for domestic and international shipbuilding projects subject to document compliance.

What information should I provide to get an accurate quotation?

Please provide grade, thickness, width, length, quantity, delivery terms and required certification documents. We will issue a formal quotation accordingly.

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GB/T 712 / ASTM A131 Shipbuilding Steel Plate | Grade A/B/D/E, AH32, AH36, AH40 Series