Products FAQ

The key differences between the two lie in their low-temperature impact toughness and the ambient temperatures for which they are suitable.

BV AH32: Requires impact toughness at 0°C and is suitable for medium- to low-load marine structures in temperate waters above 0°C.

BV DH32: Requires impact toughness at -20°C, offers excellent resistance to brittle fracture and stable low-temperature mechanical properties, and is specifically designed for primary load-bearing structures of ships and offshore platforms in cold-temperate waters ranging from -20°C to 0°C, meeting safety standards for cold regions not covered by AH32.

Since the carbon equivalent of BV AH36 is strictly controlled at ≤0.40%, it offers excellent weldability. It can be welded using conventional processes such as MIG, TIG, submerged arc welding (SAW), and shielded metal arc welding (SMAW), typically without the need for extensive preheating. Additionally, this steel grade has good formability and supports operations such as bending, cutting, and groove preparation.

The equivalent materials for BV AH36 are primarily high-strength shipbuilding plates of the same grade from other classification societies’ systems:

Depending on plate thickness, project requirements, and cost considerations, BV AH36 can be supplied in the following conditions:

AR (As-Rolled): The standard rolled delivery condition for thinner steel plates.

CR (Controlled Rolling): A rolling process performed under controlled temperature conditions.

TMCP (Thermomechanical Control Process): A process that refines grain size and improves weldability through controlled rolling and cooling, eliminating the need for subsequent heat treatment.

N (Normalized): A heat-treated condition designed to ensure microstructural uniformity and the performance of critical safety components.

Yes. This product offers broad compatibility with international standards and fully complies with the relevant marine steel specifications of major classification societies, including BV, CCS, ABS, LR, DNV, and NK.

We can provide dual or multiple classification society certifications based on customer requirements to meet the acceptance standards for projects in different regions around the world.

Common delivery conditions include:

HR: Hot-Rolled

CR: Controlled Rolled

TMCP: Thermo-Mechanical Control Process

N: Normalized

QT: Quenched and Tempered

The choice of delivery condition depends on the plate thickness and final performance requirements. TMCP and normalized treatments typically provide better low-temperature toughness and weldability.

The equivalent material grades for BV AH32 among other major classification societies include:

Specific equivalence determinations are subject to project certification requirements and the final delivery status.

The main difference is the strength level.

AH36 offers higher strength, while AH32 is typically chosen when moderate strength and better cost-effectiveness are required.

Yes. BV AH32 is specifically designed for shipbuilding and offers good weldability due to its controlled chemical composition and low carbon equivalent. Common welding methods include SAW (Submerged Arc Welding), SMAW (Shielded Metal Arc Welding), and GMAW/MIG (Gas Metal Arc Welding). Welding procedures must comply with the shipyard’s approved welding specifications, and strict adherence is particularly important when welding thick plates.

BV Grade AH32 is a high-strength marine structural steel plate certified by Bureau Veritas (BV), with a minimum yield strength of 315 MPa and impact toughness at 0°C. It is primarily used in the construction of large commercial ocean-going vessels, medium-load offshore platforms, coastal port facilities, and the repair and reinforcement of marine structures. It is the mainstream structural steel for load-bearing applications in conventional, high-standard marine engineering projects worldwide.