Products FAQ
What processing services do you offer for CCS DH32 shipbuilding steel plates?
We provide customised processing services including ultrasonic testing, Z-direction testing, low-temperature impact testing, cut-to-size cutting, surface treatment (sandblasting, rust removal, oiling and painting, etc.), and heat treatment, to meet a wide range of engineering and construction requirements.
What is the main difference between CCS DH32 and ABS DH32?
The key difference between the two lies in the certification body and the corresponding flag state requirements.
CCS DH32: Applicable to vessels flying the Chinese flag, certified by the China Classification Society (CCS).
ABS DH32: More widely recognised for projects in the United States, South Korea and the Middle East, certified by the American Bureau of Shipping (ABS).
DH32 is a high-strength marine steel plate, and certification from multiple classification societies may be applied for simultaneously as required.
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.
