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CCS Grade AH32 Shipbuilding Steel Plate - High-Strength Marine Steel Plate

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CCS Grade AH32 shipbuilding steel plate is a high-strength marine structural steel plate certified by the China Classification Society (CCS). It offers stable mechanical properties, excellent toughness at 0°C, good weldability and outstanding corrosion resistance. It is widely used in ship hull structures, decks, bulkheads, offshore platforms and other critical marine components. Our Grade AH32 steel plates are manufactured in accordance with CCS shipbuilding specifications and also comply with the standards of major international classification societies such as ABS, BV, DNV and LR. We offer a comprehensive range of specifications and provide customised processing services to meet diverse marine engineering requirements.

Certification :
CCS Rules
Standard :
GB/T 712
Grade :
CCS Grade AH32 (CSSAH32)
Thickness :
5.0 - 150.0 mm
Width :
1500.0 - 4000.0 mm
Length :
6000.0 - 18000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

1. What is CCS Grade AH32 shipbuilding steel plate?

CCS Grade AH32 shipbuilding steel plate is a high-strength structural steel certified by the China Classification Society (CCS) for use in ships and offshore engineering. It exhibits excellent toughness, weldability, corrosion resistance and stable mechanical properties in extreme marine environments. It is widely used in ship structures such as hulls, decks and bulkheads, as well as in critical structures of offshore platforms.

Our CCS Grade AH32 shipbuilding steel plate utilises advanced TMCP (Thermomechanical Control Process) and normalising heat treatment processes, ensuring high dimensional accuracy and a uniform internal microstructure. It effectively addresses common issues associated with standard ship plates, such as poor impact resistance and unstable weldability, making it an ideal structural material for commercial vessels, cargo ships, container ships and coastal offshore engineering projects.

2. Meaning of the designation

CCS: Certified by the China Classification Society

A: Quality Grade A (Impact test temperature requirement: 0°C)

H: High-strength steel

32: Minimum yield strength: 315 MPa (≈ 32 kgf/mm²)

Available Specifications and Dimensions

Product	CCS Grade AH32 Shipbuilding Steel Plate
Certification	CCS
Grade	AH32
Material Category	Heigh-Strength Structural Steel for Ship and Ocean Engineering
Thickness	5 - 150 mm
Width	1500 - 4000 mm
Length	6000 - 18000 mm
Delivery Conditions	Hot Rolled (HR), Controlled Rolled (CR), Normalized (N), Thermo-Mechanical Controlled Processed (TMCP).
Surface Conditions	We offer surface preparation services such as sandblasting, rust removal, oiling and spray painting.
Testing	Tensile test, Charpy V-notch impact test, Ultrasonic testing (UT), Z-direction property test (Grades Z15/Z25/Z35), Dimensional inspection.
Applications	Suitable for critical structural components such as ship keels, outer plating, bulkheads, decks and offshore oil drilling platforms.
MOQ	5 tons (small orders can be negotiated).
Delivery Time	15 - 20 days after order confirmation (urgent orders accepted).
Packaging	Standard export packaging for sea transport, or as required.
Country of origin	China

Chemical Composition

Chemical Composition (Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Nb	V	Ti	Mo	Als
CCS AH32	≤ 0.18	≤ 0.50	0.90 - 1.60	≤ 0.030	≤ 0.030	≤ 0.35	≤ 0.20	≤ 0.40	0.02 - 0.05	0.05 - 0.10	≤ 0.02	≤ 0.08	≥ 0.015

Carbon Equivalent (wt %)

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.36	≤ 0.38

Calculation formula (IIW): CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

Mechanical Properties

Tensile Test

Grade	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
CSS AH32	≥ 315	450 - 570	≥ 22

Charpy (V-notch) Impact Test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
CCS AH32	≤ 50	0	≥ 31	≥ 22
	> 50 - 70	0	≥ 38	≥ 26
	> 70 - 150	0	≥ 46	≥ 31

Applications

CCS Grade AH32 shipbuilding steel plate is a high-strength structural steel plate for shipbuilding and offshore engineering, widely used in critical structures across various shipbuilding and offshore engineering sectors:

1. Hull structures for ocean-going vessels, cargo ships, container ships and bulk carriers.

2. Support structures for offshore oil and gas platforms and marine engineering projects.

3. The manufacture of auxiliary shipboard equipment, shipping container floor plates and structural components.

4. Heavy structural components for large port machinery and offshore engineering equipment.

Other Information

What are the advantages of our CCS Grade AH32 shipbuilding steel plates?

1. Authoritative CCS certification, with full accreditation

The products hold valid China Classification Society (CCS) factory certification, and come with complete inspection reports and certification documents.

2. Excellent adaptability to marine environments

Featuring high strength, good ductility and toughness, ensuring the long-term stable operation of ship and offshore platform structures.

3. Excellent welding and machining properties

Low susceptibility to welding cracks, suitable for conventional welding processes such as arc welding and gas shielded welding. The steel plates feature a flat surface and uniform thickness, with good cutting, bending and forming capabilities.

4. Comprehensive range of specifications, with customisation available

We supply CCS Grade AH32 shipbuilding steel plates in a full range of sizes, covering common thicknesses, widths and lengths. We also offer further processing services such as custom cutting, polishing and heat treatment.

FAQ

Q1:

What is the difference between CCS Grade AH32 and DH32 steel?

In the China Classification Society (CCS) rules, both AH32 and DH32 are classified as high-strength structural steels for shipbuilding (both with a yield strength of 315 MPa). The key difference between them lies in the temperature at which the impact toughness test is conducted, which directly determines their resistance to brittle fracture at different ambient temperatures.

Performance	CCS AH32	CCS DH32	Notes
Yield Strength (ReH)	≥ 315 MPa	≥ 315 MPa	With the same yield strength.
Tensile Strength (Rm)	450 - 570 MPa	450 - 570 MPa	With the same tensile strength.
Elongation (A)	≥ 22%	≥ 22%	The same capacity for plastic deformation.
冲击试验温度	0 °C	-20 °C	Key differences.
Impact Energy Requirements (KV2)	≥ 31 J	≥ 31 J	Toughness requirements at low temperatures.

Q2:

Is preheating required when welding CCS Grade AH32 shipbuilding steel plates?

Plates with a thickness of less than 20 mm do not require preheating. For plates thicker than 20 mm, preheating to 80–120 °C is recommended to prevent cold cracking during welding.

Q3:

What heat-treated conditions are available for CCS Grade AH32 shipbuilding steel plates?

Available delivery conditions include as-rolled, controlled-rolled, normalised and TMCP conditions. TMCP-treated steel has a lower carbon equivalent and excellent weldability.

Q4:

What are the equivalent grades of CCS AH32 internationally?

ABS：ABS AH32, DNV:NV A32, LR:LR AH32, BV：BV AH32

Q5:

Do you provide certification documents for your CCS Grade AH32 shipbuilding steel plates?

Yes. All our CCS Grade AH32 shipbuilding steel plates come with official CCS certification, factory test reports, and chemical composition and mechanical property test certificates, which can be used to support project inspections and export clearance.

Q6:

What are the main differences between CCS AH32 and AH36 shipbuilding steel plates?

The key difference between CCS AH32 and AH36 shipbuilding steel plates lies in their yield strength grades, which directly results in differences in their mechanical properties and applications. Put simply, AH36 is a higher-strength material than AH32.

Comparison Criteria	CCS AH32	CCS AH36
Minimum yield strength	≥ 315 MPa	≥ 355 MPa
Tensile strength	450 - 570 MPa	490 - 630 MPa
Impact energy	31 J (at 0°C)	34 J (at 0°C)
Typical Applications	General-strength sections of the hull structure, such as superstructures and bulkheads.	Critical sections subject to high stresses, such as the hull bottom, sides and decks.

Q7:

Can you provide custom processing services for CCS AH32 shipbuilding steel plates?

Yes. We offer custom processing services such as cut-to-size cutting, surface treatment and heat treatment to meet the specific material requirements of various marine engineering projects.