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Help CenterS540 High Strength Steel Plate Carbon Material For Offshore Structural Projects
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Carbon Steel Plate – Backbone of Industrial Construction
Carbon steel plate is a flat-rolled steel product manufactured by hot rolling or cold rolling processes. With carbon as the primary alloying element (typically 0.05-0.50%), it offers an excellent balance of strength, ductility, weldability, and cost-effectiveness – making it the most widely used material in construction, machinery manufacturing, and infrastructure projects.
Key characteristics:
High strength – Tensile strength from 400-600+ MPa depending on grade
Excellent weldability – Suitable for arc welding, gas welding, and resistance welding
Good formability – Can be bent, rolled, stamped, and fabricated
Cost-effective – Most economical choice for structural applications
Available in large dimensions – Up to 3000mm width, 12000mm length
Material grades by application:
Grade Series |
Typical Grades |
Key Features |
Primary Applications |
General Structural |
Q235, SS400, S235JR, A36 |
Good balance of strength and weldability |
Buildings, bridges, general fabrication |
Higher Strength |
Q355, SS540, S355JR |
Higher yield strength for load-bearing structures |
Heavy construction, cranes, offshore |
Carbon Steel (Medium) |
20#, C22, S20C |
Good toughness, machinability |
Machinery parts, shafts, gears |
Carbon Steel (Higher) |
45#, C45, S45C |
Higher strength, wear resistance |
Heavy machinery, tools, molds |
Surface treatment options: Mill scale (as-rolled), pickled and oiled, painted (primer coated), galvanized, or other coatings upon request.
Each batch includes EN 10204 3.1 mill test certificate. Third-party inspection (SGS, BV, TÜV) supported. MOQ: 5 tons, trial orders welcome.
Key Specifications (Carbon Steel Plate):
Parameter |
Specification / Range |
Remarks |
Standards |
ASTM A36, A283; GB/T 700 (Q235), GB/T 1591 (Q355); JIS G3101 (SS400); EN 10025 (S235, S275, S355); DIN |
Others on request |
Grades (Structural) |
A36, Q235, Q355, SS400, S235JR, S275JR, S355JR |
Most common for construction |
Grades (Carbon/Machinery) |
20#, 45#, S20C, S45C, C22, C45, 1020, 1045 |
For mechanical parts, heat treatment |
Grade (Pressure Vessel) |
Q345R, P265GH, P355GH |
Boiler & pressure vessel applications |
Thickness |
1.5 mm – 200 mm |
Thin sheet to heavy plate |
Width |
1000 mm – 3000 mm |
Custom slitting/cutting |
Length |
2000 mm – 12000 mm |
Custom cut to size |
Surface Treatment |
As-rolled (mill scale), pickled & oiled, painted (primer), galvanized |
Custom coating available |
Edge |
Mill edge or sheared/slit edge |
– |
Density |
7.85 g/cm³ |
– |
Processing |
Cutting, drilling, bending, welding, laser/plasma cutting |
– |
Testing |
Chemical analysis (OES), tensile, hardness (HB), impact (Charpy), UT (optional) |
Mill cert provided |
Packaging |
Steel strapped bundles, wooden pallet, waterproof paper |
Seaworthy, ISPM 15 |
Q1：Do you offer sample orders？
A：Yes, samples are available for quality evaluation. Sample cost is charged but refundable upon bulk order.
Q2：What is your MOQ？
A：Our standard MOQ is 100 kg per specification. For common grades and standard sizes, we accept small batch orders. Mixed orders for different products are also welcome.
Q3：Can you provide custom sizes？
A：Yes, we can produce any length, width, thickness, or diameter based on your drawings. Cutting, slitting, and other processing services are available with tolerance as required.
Q4：What certifications do you provide？
A：Each shipment comes with EN 10204 3.1 mill test certificate (MTC). Third-party inspection reports (SGS/BV/TÜV) can be arranged upon request.
Q5：What is your lead time？
A：7–15 working days for stock items. 20–30 days for custom orders, depending on quantity and specification.
Q6：What surface treatments are available？
A：Various surface treatments are available upon request, including pickled, polished, coated, oiled, or as required.
Q7：What payment terms do you accept？
A：T/T (30% deposit + 70% against BL copy), L/C at sight, Western Union, etc.
Q8：What about packaging for export？
A：Standard seaworthy packaging with waterproof protection, steel straps, corner protectors, and ISPM 15 fumigation certification. Custom packaging is available as required.
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