Jini Enterprise | Premier Alloy Steel Round Bar Supplier in Mumbai - EN Series, 4140 & 4340 Grades

Alloy Steel Round Bar Supplier in Mumbai

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Premium Alloy Steel Round Bars – EN Series, 4140, 4340 & More

Jini Enterprise is a trusted alloy steel round bar supplier in Mumbai, offering a comprehensive range of high-performance alloy steel grades to the automotive, aerospace, heavy engineering, and general manufacturing industries. We stock a wide variety of alloy steels — including EN Series (EN8, EN24, EN31, EN19, EN36), SAE/AISI Grades (4140, 4340, 8620), and specialty Cr-Mo & Ni-Cr-Mo alloys — in round bar form.

As a dedicated alloy steel distributor, we understand that different applications demand different material properties — from high tensile strength and toughness to wear resistance and fatigue performance. Our alloy steel round bars are sourced from world-class mills with full traceability and mill test certificates, ensuring consistent quality and performance for your critical applications.

📊 Alloy Steel Grade Comparison – Choose the Right Material

Grade Equivalent Tensile (MPa) Hardness (HRC) Best Application
EN8 080M40 / 1040 500 – 700 20 – 30 General engineering, shafts, axles
EN19 709M40 / 4140 700 – 850 28 – 38 High-strength shafts, gears, bolts
EN24 817M40 / 4340 800 – 1000 30 – 44 Heavy-duty shafts, gears, aircraft components
EN31 535A99 / 52100 900 – 1100 58 – 64 Bearings, races, high-wear components
EN36 655M13 / 9310 700 – 900 25 – 35 Case-hardening, gears, camshafts
4140 1.7225 / 42CrMo4 750 – 950 28 – 40 Drill collars, heavy-duty shafts, gears

📊 Typical Chemical Composition – EN24 (817M40 / 4340)

Element Symbol Content (%)
CarbonC0.36 – 0.44
SiliconSi0.10 – 0.35
ManganeseMn0.45 – 0.70
ChromiumCr1.00 – 1.40
MolybdenumMo0.20 – 0.35
NickelNi1.30 – 1.80

🎯 How to Choose the Right Alloy Steel Round Bar?

🔹 EN8 – General Engineering

Medium tensile steel for general engineering components, shafts, and axles where high strength is not the primary requirement.

🔹 EN24 / 4340 – High Tensile

High strength, toughness, and fatigue resistance. Ideal for heavy-duty shafts, gears, connecting rods, and aerospace components.

🔹 EN31 / 52100 – Bearing Steel

Extreme hardness and wear resistance. Best for bearings, bearing races, and high-wear tooling.

🔹 4140 – Cr-Mo Steel

Excellent strength and toughness. Used in drill collars, heavy-duty shafts, gears, and general engineering components requiring high strength.

⚙️ Heat Treatment Guidelines for Alloy Steel Round Bars

EN8 (080M40)

Hardening: 820 – 850°C, quench in oil or water.

Tempering: 450 – 650°C. Achieves 20 – 30 HRC.

EN24 / 4340

Hardening: 820 – 860°C, quench in oil.

Tempering: 200 – 600°C. Achieves 30 – 44 HRC.

EN31 / 52100

Hardening: 800 – 860°C, quench in oil.

Tempering: 150 – 260°C. Achieves 58 – 64 HRC.

4140 (42CrMo4)

Hardening: 840 – 870°C, quench in oil.

Tempering: 200 – 600°C. Achieves 28 – 40 HRC.

✨ Key Features of Our Alloy Steel Round Bars

💪 High Tensile Strength

Grades available with tensile strengths ranging from 500 MPa to 1000+ MPa.

🛡️ Excellent Toughness

Good ductility and impact resistance, even at low temperatures.

⚡ Fatigue Resistance

Excellent resistance to cyclic loading for long service life.

🔧 Good Machinability

Supplied in annealed condition for efficient machining.

📐 Available Round Bar Sizes – Ready Stock

🔘 6mm – 12mm 🔘 14mm – 50mm 🔘 55mm – 150mm 🔘 160mm – 300mm 🔘 305mm – 450mm

✔ Custom diameters available on request. All bars supplied with full dimensional inspection reports.

✨ Surface Finishes Available

⚫ Hot Rolled / Black 🔘 Peeled / Turned ✨ Precision Ground (TGP) 💡 Bright Drawn

🏭 Industries & Applications Across India

🚗 Automotive Shafts & Axles
⚙️ Gears & Pinions
🔩 Bolts & Fasteners
🏗️ Heavy Machinery Components
✈️ Aerospace Structural Parts
🛢️ Oil & Gas Equipment
🔧 Tooling & Dies
⚡ Power Generation Components

🔬 Quality Assurance – Premium Alloy Steel Round Bars

✔ OES / Spectro Analysis
✔ Mechanical Testing (UTS, Yield, Elongation)
✔ Hardness (HRC/HB) Testing
✔ Ultrasonic (UT) Flaw Detection
✔ MTC (3.1 / EN 10204) Certified

📍 Based in Mumbai, Serving All of India: Sripati Castle Annex-1 C-103, 1st floor, Sripati Castle, Balwant Kolhatkar Marg, Mumbai – 400004. We serve engineering, automotive, and manufacturing industries across Mumbai, Maharashtra, and all major industrial hubs in India.

📞 Need Alloy Steel Round Bars in Mumbai? We Deliver Nationwide!

Partner with Jini Enterprise – your trusted alloy steel round bar supplier in Mumbai. We supply EN8, EN24, EN31, EN19, 4140, 4340 and all alloy steel grades with full certifications, competitive pricing, and fast delivery. Get your custom quote today!

📧 Email: jinienterprise109@gmail.com
📞 Call Now: +91 865 591 6397