EN43B Carbon Steel: Chemical Composition, Properties, Applications & Leading Suppliers in India

EN43B carbon steel is a silicon manganese spring steel known for its excellent resilience, strength, and fatigue resistance. This steel grade is specifically used in manufacturing automotive and industrial springs, axles, and high-strength components that are subject to repetitive stress or shock.

In this detailed guide, we explore everything about EN43B steel—from its chemical composition and mechanical properties to equivalent grades, heat treatment, and reliable Indian suppliers.

🔍 What is EN43B Carbon Steel?

EN43B is a low-alloy medium carbon steel containing silicon and manganese, which provides high tensile strength and good ductility. It is widely used in the spring manufacturing industry, thanks to its ability to return to shape after deformation and its high resistance to fatigue and shock loads.

This steel is typically supplied in the annealed or as-rolled condition and can be hardened and tempered for further strength enhancement.

🧪 EN43B Chemical Composition

🔍 The high silicon content contributes to the elasticity and spring properties of EN43B.

⚙️ Mechanical Properties of EN43B (Heat Treated Condition)

💡 Excellent fatigue and shock resistance makes it ideal for cyclically loaded parts.

🔥 Heat Treatment of EN43B

EN43B responds well to several heat treatment processes that enhance its performance in spring and heavy-duty applications.

• 🔧 Hardening: Heat to 820–860°C and quench in oil or water.

• 🔁 Tempering: Reheat to 450–550°C depending on required hardness and elasticity.

• 🧊 Normalizing: 840–870°C, followed by air cooling to refine grain structure.

• 🔄 Annealing: 640–680°C to improve machinability and reduce stress before forming.

📌 Post-tempering is essential to reduce brittleness and achieve desired spring properties.

🛠️ Key Features of EN43B Carbon Steel

• ✅ High elasticity and fatigue resistance

• ✅ Excellent toughness and ductility

• ✅ Suitable for oil quenching and tempering

• ✅ Good machinability in the annealed state

• ❌ Not ideal for welding in hardened condition

• ❌ Not corrosion-resistant (requires coating in corrosive environments)

🧰 Applications of EN43B Steel

EN43B is primarily used in dynamic and impact-loaded applications, especially where spring-back and cyclic strength are required.

📦 Common Applications:

• 🚗 Automotive Leaf and Coil Springs

• 🛠 Industrial Springs and Tension Bars

• 🧲 Torsion Bars and Anti-Roll Bars

• 🏗 Suspension Components

• 🚚 Axles, Shafts, and Spindles

• ⚙️ High-Tension Bolts and Studs

• 🔩 Hooks, Brackets, and Spring Washers

📌 EN43B is an excellent choice where a balance of hardness, elasticity, and toughness is required.

🔁 Equivalent Grades of EN43B

🌍 EN43B is widely accepted across international spring steel applications.

📦 Available Forms of EN43B Steel

EN43B steel is available in:

• Bright & Black Round Bars

• Hex Bars & Flats

• Forged Bars

• Peeled, Turned, or Ground Conditions

• Cut-to-Length Billets

📏 Sizes: 12 mm to 200 mm diameter
📏 Length: Up to 6 meters or as specified
🧽 Surface Finish: Bright Drawn, Peeled, Black

💰 EN43B Carbon Steel Price in India (Indicative)

📌 Pricing depends on size, surface finish, and quantity.

🧭 Top EN43B Carbon Steel Suppliers in India

Looking for high-quality EN43B spring steel? Consider the following suppliers:

• Triton Alloys Inc., Mumbai

• Virwadia Steels, Chennai

• Bright Steel Centre, Maharashtra

• Mohan Steels, Delhi NCR

• Bhansali Inc., Gujarat

• Steel House India, Mumbai

• Jindal Steel & Power

✅ Always request Mill Test Certificates (MTC) and Third-Party Inspection (TPI) if required.

📈 SEO Keywords for EN43B Carbon Steel

• EN43B carbon steel properties

• EN43B chemical composition

• EN43B vs 60Si7 spring steel

• EN43B bar suppliers India

• Spring steel EN43B applications

• EN43B round bar price

• EN43B equivalent grades

• EN43B heat treatment process

• EN43B vs EN47

• Buy EN43B spring steel online

✅ Conclusion

EN43B carbon steel is a high-performance silicon manganese spring steel designed for components requiring high strength, resilience, and fatigue resistance. Its mechanical properties make it perfect for automotive suspensions, industrial springs, and impact-loaded parts.

With widespread availability in bars, flats, and billets, and strong domestic supply chains, EN43B is a dependable material in both OEM manufacturing and aftermarket engineering.

Would you like this content converted into a technical PDF, an HTML product page, or a WordPress blog post complete with product tables and CTAs?