Products FAQ

Yes. Its low carbon equivalent ensures good weldability, making it suitable for manual metal arc welding (SMAW), submerged arc welding (SAW), gas metal arc welding (GMAW), and flux-cored arc welding (FCAW). Welding procedures should be carried out in accordance with the relevant DNV welding codes.

DNV AH32 is similar to ABS AH32, CCS AH32, BV AH32, and LR AH32 in terms of basic chemical composition and mechanical properties. The main differences lie in the following three aspects:

1. Different certifying classification societies: They are recognized by different classification societies, including DNV, ABS, CCS, BV, and LR.

2. Different inspection standards: There are variations in the specific inspection codes and testing requirements of each classification society.

3. Different certificates and scope of application: The flag states, classification requirements, and project locations covered by the certification certificates of different classification societies may vary.

Engineering Application Recommendations

These steel grades are generally interchangeable under normal operating conditions; however, in actual applications, the requirements of the project-designated classification society must be strictly adhered to.

1. Verify the Certificates

The steel mill must include the original MTC (Material Test Certificate) with the shipment. The certificate must be of the EN 10204 3.2 type and bear the signature and official stamp of a DNV surveyor.

2. Inspect the Surface Stamping

The surface of the steel plate should bear clear mechanical stamps, including: the mill mark, furnace batch number, nominal dimensions, and the steel grade designation “DNV A32.”

3. Commission Third-Party Testing

If necessary, request third-party testing (SGS, BV, etc.) prior to delivery.

Z-direction performance refers to the resistance to laminar tearing in the thickness direction of the steel plate.

Required: When used in special joints of ships, such as cross joints or T-joints, that are subject to significant tensile stress in the thickness direction, users typically specify Z-direction testing requirements (e.g., Z25 or Z35) at the time of ordering to prevent laminar tearing in the structure under welding restraint stresses.

Not required: This test is not required for conventional, non-load-bearing areas.

Good weldability: With a carbon equivalent (CEV) of ≤0.40%, this low-carbon, low-alloy steel is suitable for manual arc welding, submerged arc welding, and gas shielded arc welding. When welding at low temperatures, heat input must be controlled to prevent cold cracks.

Its key application advantage is its excellent resistance to cryogenic brittle fracture, which addresses structural safety concerns for marine steel in extremely cold polar regions. It is an essential high-performance material for high-end icebreakers and extreme offshore engineering projects.

Certainly. Every batch of our DNV Grade E shipbuilding steel plates comes with official DNV certification and a Mill Test Certificate (MTC), fully compliant with international ship inspection and offshore engineering tender standards.

Yes. We offer custom manufacturing and processing for thickness, width, and length, and can provide tailored heat treatment and surface finishing services based on customer project requirements to meet specific engineering needs.

Thickness ≤ 40 mm: As-rolled (AR) or controlled-rolled (CR).

Thickness > 40 mm: Normalized (N) or thermomechanically controlled process (TMCP) to enhance strength and toughness.

The key difference lies in low-temperature toughness:

DNV Grade D: Impact testing is conducted at -20°C; suitable for temperate and cold climates.

DNV Grade E: Impact testing is conducted at -40°C; suitable for vessels operating in Arctic or ice-covered waters that require exceptional cold resistance.