S355 Carbon Steel
We are S355 Carbon Steel Manufacturers, Suppliers, and Exporters in Mumbai, India. STEEL MART is an ISO 9001:2015 certified company established in 1986, with decades of experience in supplying high-quality carbon steel products to various industries. We specialize in manufacturing and supplying S355 Carbon Steels (EN 10025-2 S355JR / S355JO / S355J2 / S355K2 / 1.0577) that meet national and international quality standards for heavy structural engineering, offshore platforms, crane manufacturing, bridge construction, and mining equipment applications. S355 Carbon Steel is a high-yield unalloyed structural steel known for its minimum yield strength of 355 MPa, tensile strength of 470-630 MPa, exceptional weldability, high impact resistance at sub-zero temperatures, and reliable cold forming properties. With carbon content restricted below 0.20% and controlled manganese addition, S355 allows effortless conventional welding while providing 30% higher load capacity than standard S275 steels. S355 is typically supplied in normalized (+N), hot rolled, or control rolled condition, ensuring uniform mechanical properties and structural durability. This carbon steel grade is widely used for manufacturing heavy beams, columns, bridge girders, offshore jacket legs, crane booms, pressure vessel supports, and excavator frames.
Our S355 Carbon Steels are 100% Prime – Tested & Guaranteed, ensuring precise chemical composition, dimensional accuracy, and consistent mechanical properties. Each product is supplied with proper Mill Test Certificates (MTC) confirming compliance with EN 10025-2 / BS standards. STEEL MART follows strict quality control procedures and ensures timely delivery.
What is S355 Carbon Steel?
S355 Carbon Steel (EN 10025-2 S355JR / S355JO / S355J2 / S355K2 / 1.0577) is an unalloyed high-yield structural steel grade suitable for heavy construction, offshore structures, cranes, bridges, and mining equipment requiring high yield strength (355 MPa Min), excellent sub-zero impact toughness, and superior weldability. Supplied in normalized (+N), control rolled, or hot rolled plates, bars, and beams, it provides exceptional load-bearing performance and structural resilience.
355 MPa Yield Strength
Guarantees minimum yield strength of 355 MPa for heavy structural load bearing capacity.
Exceptional Weldability
Low carbon equivalent enables seamless welding with SMAW, GMAW, and SAW methods.
High Formability
Allows cold bending, shearing, pressing, and hole punching without structural degradation.
Charpy Sub-Zero Toughness
Available in JR (+20°C), JO (0°C), J2 (-20°C), and K2 (40J at -20°C) impact testing sub-grades.
Normalized (+N) Finish
Fine grain structure ensures high fatigue resistance and superior notch toughness.
Full Traceability
Supplied with complete chemical heat analysis and EN 10204 3.1 Mill Test Certificates.
Why Choose STEEL MART for S355 Carbon Steel
STEEL MART is the preferred choice for purchasing S355 Carbon Steel due to its strong reputation for quality and reliability. With over 40 years of experience in the steel industry, the company ensures that every product meets strict industry standards. The company follows strict quality inspection procedures to ensure that every S355 Carbon Steel product meets international standards.
Each product is carefully tested to ensure durability, strength, and performance. Customers trust STEEL MART for consistent quality, competitive pricing, and timely delivery. The company maintains a large inventory to meet urgent and bulk requirements efficiently. In addition to S355 Carbon Steels, STEEL MART also supplies a wide range of carbon steel and alloy steel products for various industrial applications.
Chemical Composition of S355 Carbon Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.20 % Max |
| Manganese (Mn) | 1.60 % Max |
| Silicon (Si) | 0.55 % Max |
| Sulphur (S) | 0.030 % Max |
| Phosphorus (P) | 0.030 % Max |
This chemical composition ensures optimal strength, yield resistance, and weldability.
Equivalent Grades of S355 Carbon Steel
| Standard | Equivalent Grade |
|---|---|
| EN 10025-2 | S355JR / S355JO / S355J2 / S355K2 / 1.0577 |
| BS 4360 | 50D / 50DD / 50B |
| DIN / W.Nr. | St52-3 / 1.0570 |
| ASTM | A572 Grade 50 |
| IS | IS 2062 E350 / Fe 490 |
These equivalent grades ensure global compatibility across projects.
Mechanical Properties of S355 Carbon Steel
The mechanical properties of S355 Carbon Steels make them suitable for heavy-duty load-bearing structural and engineering fabrications. In normalized (+N) or control rolled condition, this grade delivers guaranteed minimum 355 MPa yield strength and high impact toughness.
Heat Treatment & Processing of S355 Carbon Steel
S355 Carbon Steels can be processed using standard heat treatment techniques.
Normalizing (+N)
Heated to 890°C–930°C and air-cooled to refine grain structure and impact resistance.
Annealing
Heated to 850°C–890°C for maximum cold formability.
Stress Relieving
Heated to 550°C–650°C to remove residual welding and flame cutting stresses.
Flame / Plasma Cutting
Easily cut into custom structural shapes, flanges, and profiled plates.
S355 Carbon Steel Industry Applications
S355 Carbon Steels are widely used across multiple industrial sectors.
Construction & High-Rise
Used for heavy structural columns, main beams, baseplates, and trusses.
Bridge & Highway Engineering
Used in bridge girders, stiffener plates, and overpass supports.
Crane & Lifting Equipment
Used for crane booms, excavator arms, and heavy chassis frames.
Offshore & Marine Structures
Used for platform legs, jacket structures, and deck plating.
Mining & Earthmoving
Used in crusher frames, dump truck bodies, and shovel booms.
Power Plants & Energy
Used for wind turbine towers, boiler supports, and heavy flanges.
Availability and Customization
At STEEL MART, we supply S355 Carbon Steels in a wide range of sizes and specifications.
| Thickness / Size | Plates from 3 mm to 300 mm, bars from 10 mm to 450 mm |
| Condition | Available in As-Rolled / Normalized (+N) / Control Rolled condition |
| Length | Standard lengths from 3 meters to 12 meters |
| Forms | Plates, Sheets, Round Bars, Flat Bars, Channels, Angles, Beams, H-Sections |
| Customization | Custom cut sizes, profiling, and beveling available as per drawings |
| Services | Plasma cutting, laser cutting, shearing, and drilling available |
| Certification | Supplied with Mill Test Certificates and inspection reports |
Our strict quality control ensures consistent quality.
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S355 Carbon Steel (EN 10025-2 S355JR / S355JO / S355J2 / S355K2 / 1.0577) is a highly reliable high-yield structural steel widely specified across heavy construction, offshore structures, bridge engineering, and crane manufacturing. Featuring 355 MPa minimum yield strength, exceptional weldability, and superior sub-zero impact toughness, it provides long-term structural security for columns, beams, girders, plates, and heavy machinery frames. Supplied by STEEL MART with strict quality control and Mill Test Certification, S355 Carbon Steel is a cost-effective and dependable solution for engineering applications.
Frequently Asked Questions
Common answers regarding S355 Carbon Steel specifications and parameters.
S355 provides a guaranteed minimum yield strength of 355 MPa for nominal thickness up to 16 mm.
They specify Charpy V-notch impact test requirements: JR requires 27J at +20°C, JO requires 27J at 0°C, J2 requires 27J at -20°C, and K2 requires 40J at -20°C.
BS 4360 Grade 50D / 50DD, DIN St52-3 (1.0570), ASTM A572 Grade 50, and IS 2062 E350.
Yes, its low carbon equivalent allows all standard welding processes with excellent joint strength.
Plates, Sheets, Round Bars, Flat Bars, Angles, Channels, I-Beams, H-Sections, and custom profiled cut plates.