We supply premium offshore engineering steel plates designed to meet the rigorous demands of marine environments. Our capabilities include supplying 50mm and 100mm thick S460G2+QT steel plates utilizing advanced EQ43-EQ51 and WDB620E production processes. We have successfully produced ultra-thick A517GrQ steel plates (177.8mm, 185mm, and 215mm) certified by the ABS classification society.
Additionally, our S355G10+N steel plates in thicknesses ranging from 25mm to 110mm are highly sought after in the market, with all performance indicators fully meeting international standards. We also proudly supply NVE690 high-strength marine steel plates for critical offshore engineering projects.
Certified Steel Grades by Major Classification Societies
Our marine and offshore steel plates are rigorously tested and certified by the world's leading classification societies.
1. ABS (American Bureau of Shipping) Certified Grades:
Grade A: AQ56, AQ63, AQ70
Grade D: DQ56, DQ63, DQ70
Grade E: E36-Z35, E40 (Thickness ≤100mm), EQ56, EQ63, EQ70
Grade F: F40 (Thickness ≤50mm)
2. DNV (Det Norske Veritas) Certified Grades:
Grade A: NVA420, NVA460, NVA500, NVA550, NVA620, NVA690
Grade D: NVD420, NVD460, NVD500, NVD550, NVD620, NVD690
Grade E: NVE420, NVE460, NVE500, NVE550, NVE620, NVE690
3. CCS (China Classification Society) Certified Grades:
Grade A: A420, A460, A500, A550, A620, A690
Grade D: D420, D460, D500, D550, D620, D690
Grade E: E420, E460, E500, E550, E620, E690
4. ASTM / ASME Certified Offshore Grades:
Grades: ASTM A514GrQ, A517GrQ
Thickness: Certified up to 215mm.
(Note: We also supply popular offshore platform grades including S460G2+QT, EQ43, EQ51, EQ56, EQ63, EQ70, and S355G10+N.)
Offshore Platform Steel: International vs. Chinese Standards Cross-Reference
To assist our global clients in material selection, below is a cross-reference guide comparing international standards with equivalent Chinese standards (GB).
| International Standard | Common Grades | Equivalent Chinese Standard (GB) |
| ASTM A131 / A131M | Grade B, CS | GB 712 (Grades B, D, D36, E36, E36-Z35, D40, F40) |
| API 2H | API 2H Grade 50 | GB 712 |
| API 2W | API 2W Grade 50 | GB 712 |
| ASTM A36 / A36M | A36 | GB/T 700 |
| ASTM A572 / A572M | A572 Gr.42, A572 Gr.50 / Gr.60 | GB/T 1591 |
| ASTM A633 / A633M | A633B, A633D | GB/T 1591 |
| DIN 17102 (Germany) | STE355 | GB/T 1591 |
| BS 4360 (UK) | 43B, 50D, 55E | GB/T 1591 |
| BS 7191:1989 (UK) | 355D, 355EM, 450EMZ | GB/T 1591 / GB 16270 |
| JIS G 3115 (Japan) | SPV 355 | GB 6654 |
| JIS G 3106 (Japan) | SM490B, SM490C | - |
| ASTM A537 / A537M | Class 1, Class 2, Class 3 | - |
Key Applications & High-Performance Requirements
Our Grade E offshore engineering steel plates are engineered for extreme environments, meeting the strict requirement of -40°C low-temperature impact testing and delivering a minimum yield strength of 690 MPa.
Having achieved certifications from ABS, DNV, and CCS, these materials are widely used in critical marine structures, including:
Jack-up drilling rig racks
Drilling platform cantilever beams
Offshore wind turbine installation vessels
Comprehensive Supply Capabilities: Dimensions, Delivery States & Testing
1. Rolled Steel Plate Dimensions
Thickness: 8mm - 700mm
Width: 1500mm - 4020mm
Length: 3000mm - 27000mm
2. Delivery States (Heat Treatment)
Depending on performance requirements and customer needs, plates can be supplied in various conditions:
AR (As-Rolled)
CR (Controlled Rolling)
TMCP (Thermo-Mechanical Control Process)
N (Normalized)
Q (Quenched)
T (Tempered)
QT (Quenched and Tempered)
N+T (Normalized and Tempered)
3. Z-Direction Properties & 9 Classification Society Approvals
Our shipbuilding plates are approved by 9 major international classification societies: ABS (USA), BV (France), LR (UK), GL (Germany), DNV (Norway), RINA (Italy), NK (Japan), CCS (China), and KR (South Korea). We are fully capable of producing plates with Z-direction properties (Z15, Z25, Z35) to prevent lamellar tearing.
4. Global Standards & Ultrasonic Flaw Detection (UT)
We supply materials conforming to GB, ASTM, ASME, JIS, DIN, NF, BS, EN, and ISO standards.
We execute strict Ultrasonic Testing (UT) according to global standards, including:
China: JB4730, GB/T2970
USA: ASTM A435, ASTM A577, ASTM A578
Japan: JIS G0801, JIS G0901
Germany: SEL072
UK: BS5996
France: NF A04-305
Forged Marine Engineering Steel Products
In addition to rolled plates, we supply high-grade forgings in various offshore steel grades (including NVD550, NVD620, NVD690, NVE420, NVE460, NVE500). Our forging capabilities include:
Forged Round Bars: Diameter φ200mm - φ800mm | Length up to 12,000mm
Forged Modules / Blocks: Thickness 200mm | Width 200mm - 1000mm | Length 1300mm - 12,000mm
Shaft Forgings: Max Diameter 900mm | Min Diameter 150mm | Length ≤ 6000mm | Max Single Weight: 20 Tons
Ring Forgings: Max Diameter 1600mm | Max Thickness 450mm
Disc / Cake Forgings: Max Diameter 2000mm | Min Thickness 120mm
