S460M+SB EN 10025-4 Offshore Plate Supplier

S460M+SB EN 10025-4 Offshore Plate Supplier

Gangsteel – China’s Largest Mill-Direct Supplier & Exporter of S460M+SB EN 10025-4 Offshore Plates

Gangsteel is the premier supplier for S460M+SB EN 10025-4 offshore plates, delivering the high-strength S460M grade with the SB package (Seamless + Better toughness) specifically developed for offshore wind and oil & gas structures. We maintain the largest dedicated stock of S460M+SB in Asia – over 4,000 tons always ready in thickness 10–200 mm, width 1500–4200 mm, length up to 18 meters. All plates are genuine TMCP produced by top mills (HBIS, Shougang) with full European approvals and third-party inspection (DNV-GL, ABS, LR, BV, CCS, KR, TÜV, SGS).

“S460M+SB” combines the standard S460M (EN 10025-4) with additional offshore requirements (the “SB” = Seamless + Better), typically including:

• Mandatory Z35 through-thickness quality
• Enhanced impact toughness (≥50 J average at –40 °C or –50 °C)
• CTOD fracture toughness testing
• Strain ageing resistance test
• Full compliance with DNV-OS-B101, Norsok M-120, and API 2W

Immediate delivery worldwide in 3–7 days. Full processing services available.

Explore our complete en 10025 4 High Strength Structural Steel series and the standard low-temperature grade en 10025 4 s460ml steel plate.

What is S460M+SB EN 10025-4 Offshore Plate?

S460M+SBis the offshore-enhanced version of S460M under EN 10025-4.

The base grade is S460M – TMCP weldable fine-grain structural steel with 460 MPa yield and ≥40 J at –20 °C.

“+SB” (Seamless + Better) is a market designation used by leading mills and classification societies to indicate S460M with additional offshore guarantees, typically:

• Z35 through-thickness quality mandatory
• Higher impact energy (≥50 J average at –40 °C or –50 °C)
• CTOD ≥0.25 mm at –40 °C
• Strain ageing test (impact after 5 % strain + ageing)
• PWHT simulation test
• Full compliance with offshore standards

The base material is identical to S460M – same chemistry, same strength, same TMCP process.

The difference is only in the additional testing and guarantees required for offshore certification.

Most new offshore wind projects (Hornsea, Borkum Riffgrund, Formosa, Baltica) now specify S460M+SB (or S460MLO) for critical welded joints instead of plain S460M.

Gangsteel supplies full S460M+SB offshore-certified plates directly from stock – no waiting for mill extras.

Chemical Composition – Identical to S460M (Enhanced for Offshore)

Typical Gangsteel actual values for S460M+SB offshore packages: C 0.09–0.12 %, CEV 0.41–0.45, P+S ≤0.025 %.

Mechanical Properties – Standard vs Offshore Enhanced Requirements

Base mechanical properties are identical to S460M, but S460M+SB has additional offshore guarantees.

S460M+SB plates from Gangsteel routinely achieve:

• Impact values 120–250 J at –50 °C
• CTOD 0.45–0.65 mm at –40 °C
• Z35 with ≥40–50 % reduction of area

Weldability – Excellent with Offshore Guarantees

Both grades have the same low CEV, but S460M+SB's additional testing guarantees superior HAZ properties after high heat input welding.

No preheating required up to 80 mm for both grades. Gangsteel provides welding recommendations and heat-specific data for S460M+SB.

Price Difference and Market Reality

The extra cost of S460M+SB is easily justified by the additional safety margin and reduced risk of weld failure in offshore environments.

Why Choose Gangsteel for S460M and S460M+SB Plates

• Largest stock of both S460M and S460M+SB in Asia (8,000+ tons combined)
• Factory-direct price – 60–120 USD/ton lower than traders
• Full offshore certification packages for S460M+SB in stock
• Z35 quality always available
• Immediate delivery worldwide
• Exported to 90+ countries with perfect documentation
• One-stop service – stock → processing → shipping

FAQ – Detailed Answers

Q1: Is S460M+SB a separate grade in EN 10025-4?

A: No – it is S460M with additional offshore requirements (higher impact, CTOD, Z35 mandatory). The base material is identical.

Q2: Can I use S460M instead of S460M+SB?

A: Only if the project specification allows. Most offshore wind projects now require the S460M+SB package.

Q3: What is the price difference?

A: S460M+SB is 120–220 USD/ton higher than standard S460M.

Q4: Do you have S460M+SB in stock?

A: Yes – large stock of S460M+SB with full offshore certification ready.

Q5: Additional testing for S460M+SB?

A: CTOD toughness, strain ageing test, higher impact energy, Z35 mandatory – all included.

Contact Gangsteel Today

Need S460M or S460M+SB plates? Contact us for quotation within 2 hours.

Email: admin@gangsteel.com WhatsApp/WeChat/Mobile: +86 135 9887 9167 Website: https://gangsteel.net/

Gangsteel – Your Expert for Both Standard and Offshore S460M Plates.

EN 10025-4 S460M Steel plate other property