ST 42 Carbon Steel
We are ST 42 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 ST 42 Carbon Steels (DIN 17100 St44-2 / St44-3 / 1.0044 / EN 10025 S275JR) that meet national and international quality standards for medium structural engineering, construction, plate fabrication, and machinery manufacturing applications. ST 42 Carbon Steel is a German standard unalloyed structural steel known for its minimum yield strength of 275 MPa, tensile strength of 410-560 MPa, outstanding weldability, superior ductility, and reliable cold forming properties. With carbon content restricted below 0.21%, ST 42 allows effortless conventional welding without pre-heating, providing higher structural strength and load capacity compared to lower grade St37 steels. ST 42 is typically supplied in hot rolled, cold drawn, normalized, or control rolled condition, ensuring uniform mechanical properties and structural stability. This carbon steel grade is widely used for manufacturing structural beams, columns, plates, bridge girders, storage tanks, equipment frames, flanges, and welded fabrications.
Our ST 42 Carbon Steels are 100% Prime ā 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 DIN / EN standards. STEEL MART follows strict quality control procedures and ensures timely delivery.
What is ST 42 Carbon Steel?
ST 42 Carbon Steel (DIN 17100 St44-2 / St44-3 / 1.0044 / EN 10025 S275JR) is an unalloyed medium-strength structural steel grade suitable for general engineering, structural fabrications, bridges, and industrial equipment requiring higher yield strength (275 MPa Min), reliable ductility, and exceptional weldability. Supplied in hot rolled, cold drawn, or normalized condition, it provides uniform mechanical properties and structural security.
275 MPa Yield Strength
Guarantees minimum yield strength of 275 MPa for structural load bearing components.
Exceptional Weldability
Low carbon equivalent enables seamless conventional welding without pre-heating.
High Formability
Allows cold bending, shearing, pressing, and hole punching without cracking.
Charpy Impact Resilience
Delivers 27 J Charpy V-notch impact toughness for environmental stability.
Structural Ductility
Uniform grain structure ensures high fatigue endurance in heavy frames.
Full Traceability
Supplied with complete chemical heat analysis and EN 10204 3.1 Mill Test Certificates.
Why Choose STEEL MART for ST 42 Carbon Steel
STEEL MART is the preferred choice for purchasing ST 42 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 ST 42 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 ST 42 Carbon Steels, STEEL MART also supplies a wide range of carbon steel and alloy steel products for various industrial applications.
Chemical Composition of ST 42 Carbon Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.21 % Max |
| Manganese (Mn) | 1.50 % Max |
| Silicon (Si) | 0.05 ā 0.35 % |
| Sulphur (S) | 0.045 % Max |
| Phosphorus (P) | 0.045 % Max |
This chemical composition ensures optimal strength, ductility, and weldability.
Equivalent Grades of ST 42 Carbon Steel
| Standard | Equivalent Grade |
|---|---|
| DIN 17100 | St44-2 / St44-3 / 1.0044 |
| EN 10025 | S275JR / S275J0 / 1.0044 |
| BS 4360 | 43B / 43C |
| ASTM | A36 / A572 Grade 42 |
| IS | IS 2062 E275 / Fe 410 W |
These equivalent grades ensure global compatibility across projects.
Mechanical Properties of ST 42 Carbon Steel
The mechanical properties of ST 42 Carbon Steels make them suitable for load-bearing structural and engineering fabrications. In hot rolled or normalized condition, this grade delivers guaranteed yield strength, balanced tensile strength, and high elongation.
Heat Treatment & Processing of ST 42 Carbon Steel
ST 42 Carbon Steels can be processed using standard heat treatment techniques.
Normalizing
Heated to 890Ā°Cā930Ā°C and air-cooled to refine grain structure.
Annealing
Heated to 850Ā°Cā890Ā°C for maximum cold softness and formability.
Stress Relieving
Heated to 550Ā°Cā650Ā°C to eliminate residual welding stresses.
Flame / Plasma Cutting
Easily cut into custom structural shapes, flanges, and plates.
ST 42 Carbon Steel Industry Applications
ST 42 Carbon Steels are widely used across multiple industrial sectors.
Construction & Framing
Used for building columns, beams, baseplates, and structural trusses.
Bridge Fabrication
Used in bridge girders, stiffener plates, and support structures.
Heavy Equipment Frames
Used for machinery bed plates, crane booms, and equipment chassis.
Storage Tanks & Vessels
Used for oil storage tanks, silo structures, and welded ducting.
Agricultural Machinery
Used in trailer chassis, agricultural equipment frames, and brackets.
Marine & Offshore
Used for platform structural members, deck plating, and dock fittings.
Availability and Customization
At STEEL MART, we supply ST 42 Carbon Steels in a wide range of sizes and specifications.
| Diameter / Thickness | Bars from 10 mm to 400 mm, plates from 3 mm to 250 mm |
| Condition | Available in As-Rolled / Normalized / Control Rolled condition |
| Length | Standard lengths from 3 meters to 12 meters |
| Finish | Bright drawn, black hot rolled, and turned finish available |
| Customization | Custom cut sizes available as per project requirements |
| Services | Machining, cutting, turning, and grinding services available |
| Certification | Supplied with Mill Test Certificates and inspection reports |
Our strict quality control ensures consistent quality.
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ST 42 Carbon Steel (DIN 17100 St44-2 / St44-3 / 1.0044 / EN 10025 S275JR) is a highly reliable unalloyed structural steel widely used in general construction, structural fabrications, bridges, and machinery manufacturing. With 275 MPa minimum yield strength, exceptional weldability, and uniform mechanical properties, it provides long-term structural security for columns, beams, girders, plates, and machinery frames. Supplied by STEEL MART with strict quality control and Mill Test Certification, ST 42 Carbon Steel is a cost-effective and dependable solution for engineering applications.
Frequently Asked Questions
Common answers regarding ST 42 Carbon Steel specifications and parameters.
ST 42 (St44-2) provides a guaranteed minimum yield strength of 275 MPa.
Yes, its low carbon equivalent allows all conventional welding processes without requiring pre-heating.
DIN 17100 St44-2 / 1.0044, EN 10025 S275JR (1.0044), BS 4360 43B, ASTM A36 / A572 Gr 42, and IS 2062 E275.
ST 42 has higher yield strength (275 MPa vs 235 MPa) and tensile strength (410-560 MPa vs 360-510 MPa) than ST 37.
Round bars, Flat bars, Plates, Sheets, Hex bars, Angles, Channels, I-Beams, and custom cut sizes.