DNV-OS-B101 — DNV Marine Structural Steel Specifications
Grades
普通强度: A, B, D, E; 高强度: AH32, DH32, EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40, EH40, FH40; 调质高强: Q460, Q500, Q550, Q620, Q690, Q890, Q960
Chemical composition and mechanical properties
| Grade | Chemical composition | Mechanical properties |
|---|---|---|
| D | C≤0.21, Mn≥0.60(>25mm), P≤0.035, S≤0.035 | Rm 400-520 MPa, Rp0.2 ≥235 MPa, A≥22%, quenching and tempering |
| E | C≤0.18, Mn≥0.70, P≤0.035, S≤0.035, Al≥0.015 | Rm 400-520 MPa, Rp0.2 ≥235 MPa, A≥22%, Akv≥27J at -40℃, quenching and tempering |
| AH32 | C≤0.18, Mn 0.70-1.60, Si 0.10-0.50, P≤0.030, S≤0.030, Nb 0.005-0.05, V 0.02-0.10, Ti≤0.02, Cu≤0.35, Cr≤0.20, Ni≤0.40, Mo≤0.08, N≤0.012 | Rm 440-590 MPa, Rp0.2 ≥315 MPa, A≥22%, Akv≥31J at 0℃, TMCP/normalizing |
Application scope
DNV-OS-B101 is the Norwegian classification society's specification for marine structural steel, covering steel plates for ships and offshore facilities. Grades include ordinary strength A, B, D, E, high strength AH to FH, and tempered high strength Q series. The specification stipulates requirements for composition, mechanical properties, and low-temperature impact resistance, emphasizing good weldability and low-temperature toughness. Delivery must be approved by the relevant classification society or system for use in ship hulls and marine structures.
Typical applications
Widely used in the hull structure, decks, and bulkheads of DNV-classed vessels, as well as load-bearing components such as offshore platforms and marine engineering structures. The standard strength grade is used for conventional hulls, while the high-strength and tempered high-strength grades are used for high-stress, weight-reduction, and heavy-load components. With good weldability and low-temperature toughness, it is suitable for cold-water environments and for ship and marine equipment structures where welding is the primary method of application.
