Why Choose Shipyard-Certified Steel Plates?
In marine engineering, using certified materials isn't optional-it's mandatory. Shipyard-certified steel plates are the foundation of vessel safety, seaworthiness, and insurability. Here's why you must always choose classification-approved steel, and where high-strength grades like AH36 and DH36 fit in.
Detailed Explanation of Core Differences
Guaranteed Mechanical Performance
Class societies (e.g., ABS, CCS, DNV, LR) impose strict requirements on yield strength, tensile strength, and impact toughness.
Example: AH36 steel delivers a minimum yield strength of 355 MPa and passes -20°C Charpy impact tests-critical for superstructures and cargo holds.
Low-Temperature Toughness (DH36 Advantage)
Operating in cold waters demands extra resilience. DH36 steel undergoes impact testing at -20°C, offering superior crack resistance compared to AH36. This makes it the preferred choice for:
Ice-class vessels
Offshore structures in northern routes.
Statutory & Insurance Compliance
Using non-certified steel voids Port State Control and invalidates hull insurance. Every class-approved plate comes with a mill certificate traceable to an approved producer.
Summary Table: AH36 vs DH36
| Grade | Min. Yield | Impact Test Temp. | Best For |
|---|---|---|---|
| AH36 | 355 MPa | 0°C to -20°C | General hull, decks, bulkheads |
| DH36 | 355 MPa | -20°C | Ice-going vessels, exposed offshore parts |
who choose us?
We promise to provide genuine and verifiable factory certification certificates from the Classification Society and product inspection certificates along with the goods. This is a crucial requirement for the shipyard's warehouse acceptance process.
Common specifications are in ample supply and can be cut to any length as per customer requirements. This feature helps shipyards reduce waste from leftover materials and lower procurement costs.
Based on the size of the order and the history of cooperation, we can offer competitive payment terms to help the shipyard optimize its cash flow.
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Choose YUXIN steel group, and what you purchase is not merely the steel plates, but also a complete warranty system and a sense of responsibility.
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FAQ
01.What is the difference between AH36 and DH36 steel plates?
Both AH36 and DH36 offer a minimum yield strength of 355 MPa, making them high-strength marine grades. The key difference lies in impact toughness temperature:
AH36 is tested at 0°C to -20°C, suitable for general hull construction, decks, and bulkheads.
DH36 is tested at -20°C, providing better crack resistance for ice-going vessels and exposed offshore structures.
02.Why must I use class society certified steel plates instead of regular mild steel?
Class society certified steel plates (e.g., ABS, CCS, DNV, LR) are mandatory for shipbuilding because:
They guarantee mechanical properties (yield, tensile, impact) through third-party inspection.
Non-certified steel voids Port State Control approval and hull insurance.
Class certificates provide full traceability from mill to vessel.
Using uncertified mild steel can lead to structural failure, legal penalties, and denied insurance claims.
03.Can I use AH36 and DH36 interchangeably in the same project?
Not always. While both grades share the same strength level (355 MPa yield), their low-temperature performance differs. You should follow the design specifications:
Use AH36 for interior structures and mild environment zones.
Use DH36 for sheer strakes, bilge strakes, and ice belt areas where -20°C impact resistance is required.
Mixing grades is acceptable only when each plate meets its assigned zone requirement per class society rules.
04.What documents prove a steel plate is class society certified?
A genuine class society certified steel plate comes with a mill certificate (e.g., EN 10204 Type 3.2) signed by both the manufacturer and an independent surveyor. The certificate must state:
Grade (e.g., AH36 or DH36)
Class society stamp (ABS, CCS, DNV, LR, etc.)
Heat number and mechanical test results.
China one-stop steel processing procurement
Through years of understanding and precipitation of steel, Yuxin Group has now become a mature steel processing and manufacturer, providing various products for many construction companies and steel structure companies around the world. Thanks to Yuxin Group's professionalism and integrity, it has become a world-renowned enterprise.
