EN 10225-3:2019 Standard

EN 10225-3:2019 Standard (Weldable Structural Steels for Fixed Offshore Structures: Technical Delivery Conditions – Hot Finished Hollow Sections)

The EN 10225-3:2019 standard specifies steel grades for hot finished hollow sections used in fixed offshore structures (such as offshore platforms, pipelines, etc.).

Number of Grades

According to the standard, EN 10225-3:2019 includes a total of 26 steel grade designations, primarily divided into S355, S420, and S460 series, covering different processing conditions (such as +N, +M, +LO, etc.) to meet varying strength and toughness requirements.

Main Grade List

Below is the list of steel grade designations in EN 10225-3:2019 (grouped by series):

S355 Series (Group 1 & 2, Yield Strength 355 MPa)

1. S355G1
2. S355G2
3. S355G3
4. S355G4
5. S355G5
6. S355G6
7. S355G7
8. S355G8
9. S355G9
10. S355G10
11. S355G11
12. S355G12
13. S355G13
14. S355G14
15. S355G15

S420 Series (Group 3, Yield Strength 420 MPa)

16. S420G1
17. S420G2
18. S420G3
19. S420G5
20. S420G6

S460 Series (Group 4, Yield Strength 460 MPa)

21. S460G1
22. S460G2
23. S460G3
24. S460G4
25. S460G5
26. S460G6

These grades are classified based on processing conditions (such as normalized +N, thermomechanically rolled +M, and LO grade low carbon equivalent) and strength levels, making them suitable for fixed offshore structures (such as platform legs, supports, and pipe piles). They emphasize weldability, low-temperature toughness, and resistance to lamellar tearing.

Brief Standard Overview

• Scope: Primarily applies to hot finished hollow sections (such as seamless or high-frequency welded tubes), with thicknesses ≤ 100 mm, and strength levels ranging from S355 to S460 MPa.
• Key Requirements: Strict control of impurities (P ≤ 0.025%, S ≤ 0.020%), CEV ≤ 0.43% to ensure weldability; low-temperature Charpy impact testing ≥ 27 J at -50°C.
• Differences from EN 10025-3: EN 10225-3 is a dedicated offshore standard, more stringent than EN 10025-3 (e.g., S355NL), tailored for fixed offshore structures in the oil and gas industry.

If you need detailed specifications, chemical compositions, or application examples for specific grades, Gangsteel can provide more information or quotes!