EN 12 Carbon Steel
We are EN 12 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 and alloy steel products to various industries. We specialize in manufacturing and supplying EN 12 Carbon Steels (BS 970 EN 12 / 708M40) that meet national and international quality standards for heavy engineering, automotive, defense, and industrial machinery applications. EN 12 Carbon Steel is a low-alloy carbon engineering steel known for its high tensile strength, superior impact toughness, high fatigue resistance, and good machinability. This grade is widely used in engineering components requiring high strength, shock resistance, and reliability under heavy torsional loads. EN 12 is typically supplied in quenched and tempered (Q&T), normalized, or bright drawn condition, ensuring consistent and reliable mechanical performance. This carbon steel grade is widely used for manufacturing axles, spindles, drive shafts, connecting rods, gears, pinions, and studs.
Our EN 12 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 BS 970 / EN standards. STEEL MART follows strict quality control procedures and ensures timely delivery.
What is EN 12 Carbon Steel?
EN 12 Carbon Steel (BS 970 EN 12 / 708M40) is a low-alloy carbon engineering steel grade designed for components requiring high tensile strength, excellent shock resistance, and outstanding fatigue performance. Supplied in quenched and tempered (Q&T), normalized, or bright drawn conditions, it provides reliable performance for heavy axles, drive spindles, connecting rods, and transmission gears.
High Tensile Strength
Delivers up to 850 MPa tensile strength for high stress applications.
Good Machinability
Easily turned, milled, and drilled into precision shafts and pinions.
High Shock Toughness
Low-alloy structure provides high resilience under dynamic impact.
Oil Quenching & Tempering
Achieves uniform core & surface hardness for extreme durability.
Fatigue Endurance
Resists cyclic loading and torsional stress in transmission components.
Certified Quality
Supplied with full MTC and strict quality compliance.
Why Choose STEEL MART for EN 12 Carbon Steel
STEEL MART is the preferred choice for purchasing EN 12 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 EN 12 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 EN 12 Carbon Steels, STEEL MART also supplies a wide range of carbon steel and alloy steel products for various industrial applications.
Chemical Composition of EN 12 Carbon Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.35 – 0.45 % |
| Manganese (Mn) | 0.60 – 1.00 % |
| Nickel (Ni) | 0.40 – 0.70 % |
| Silicon (Si) | 0.10 – 0.35 % |
| Sulphur (S) | 0.050 % Max |
| Phosphorus (P) | 0.050 % Max |
This chemical composition provides high toughness, strength, and fatigue resistance.
Equivalent Grades of EN 12 Carbon Steel
| Standard | Equivalent Grade |
|---|---|
| BS 970 | EN 12 / 708M40 |
| AISI / SAE | 4140 / 8640 / 1040 |
| DIN / W.Nr. | 40Cr4 / 1.7035 |
| EN | 41Cr4 / 1.7035 |
| JIS | SCr440 |
These equivalent grades ensure global compatibility across engineering standards.
Mechanical Properties of EN 12 Carbon Steel
The mechanical properties of EN 12 Carbon Steels make them ideal for heavy machinery, shafts, and axles. In quenched & tempered condition, this grade offers elevated tensile strength, high yield strength, and exceptional shock resistance.
Heat Treatment & Processing of EN 12 Carbon Steel
EN 12 Carbon Steels respond exceptionally well to oil quenching and tempering for high toughness.
Normalizing
Heated to 850°C–880°C and air-cooled to refine grain structure.
Oil Quenching
Heated to 830°C–860°C and quenched in oil for deep through-hardening.
Tempering
Reheated to 550°C–660°C to achieve optimum toughness and ductility.
Induction / Flame Hardening
Surface hardening up to 55–60 HRC for high wear components.
EN 12 Carbon Steel Industry Applications
EN 12 Carbon Steels are widely used across high-stress engineering sectors.
Drive Axles & Spindles
Used for heavy drive shafts, spindles, and axles.
Automotive & Engine
Used for connecting rods, crankshafts, and levers.
Gears & Pinions
Used for high-stress gears, transmission pinions, and couplings.
High Strength Fasteners
Used for heavy studs, bolts, and connecting pins.
Hydraulic & Earthmoving
Used in hydraulic rams, excavator shafts, and pins.
Heavy Machinery
Used in press shafts, machine tool spindles, and rotors.
Availability and Customization
At STEEL MART, we supply EN 12 Carbon Steels in a wide range of sizes and specifications.
| Diameter | Diameter ranging from 10 mm to 400 mm |
| Condition | Available in As-Rolled / Normalized / Q&T / Bright Drawn condition |
| Length | Standard lengths from 3 meters to 6 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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EN 12 Carbon Steel (BS 970 EN 12 / 708M40) is a high-strength low-alloy carbon engineering steel widely used in automotive, hydraulic, and heavy machinery manufacturing. With its high tensile strength, superior shock toughness, and heat treatment performance, it provides long-term reliability for drive axles, spindles, connecting rods, and transmission gears. Supplied by STEEL MART with strict quality control and Mill Test Certification, EN 12 Carbon Steel is a dependable solution for high-stress engineering applications.
Frequently Asked Questions
Common answers regarding EN 12 Carbon Steel specifications and parameters.
Its low-alloy nickel-manganese composition provides superior toughness and impact resistance, preventing brittle failure under sudden heavy loads.
Yes, it is typically supplied in oil-quenched and tempered (Q&T) condition to achieve 700 to 850 MPa tensile strength.
BS 970 EN 12 / 708M40, AISI 4140 / 8640, and DIN 40Cr4 (1.7035).
Drive axles, spindles, connecting rods, high-stress gears, transmission pinions, and hydraulic rams.
Round bars, Flat bars, Hex bars, Plates, Sheets, and custom cut sizes.