Products FAQ
Can your CCS DH32 shipbuilding steel plates be dual-certified by other classification societies?
Yes. Depending on your project requirements, we can supply steel plates with dual or multiple certifications (e.g. CCS/ABS/DNV/BV/LR Grade DH32), offering you maximum flexibility for international shipbuilding projects.
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. |
In which parts of a ship is CCS Grade AH36 shipbuilding steel plate primarily used?
Due to its high strength, it is often used in the manufacture of hull plating, decks, hatch coamings, the bottom of the hull and the topsides—areas that are required to withstand heavy loads.
What is the CCS AH36 equivalent steel in other standards?
CCS Grade AH36 is highly equivalent to ABS Grade AH36, DNV Grade AH36, BV Grade AH36 and LR Grade AH36 under international classification standards.
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.
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.
What are the equivalent grades of CCS AH32 internationally?
ABS：ABS AH32, DNV:NV A32, LR:LR AH32, BV：BV AH32
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.
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. |
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.
