At Namo Alloy, we are prominent stockists of high-strength Alloy Steel and Carbon Steel Round Bars designed for critical mechanical parts. Our inventory includes premium carbon grades like EN8, EN9, and 1018 for general engineering, alongside high-performance alloy grades such as 4140, 4340, EN19, and EN24. These bars are specifically engineered to provide superior through-hardening, exceptional toughness, and high fatigue resistance. Ideal for manufacturing crankshafts, heavy-duty gears, axels, and high-tensile bolts, our bars are available in Hot Rolled, Forged, and Quenched & Tempered (Q&T) conditions. Every piece is 100% mill-certified, ensuring precise chemical composition and defect-free internal structures for long-term industrial reliability.
| Grade | C (Carbon) | Mn (Manganese) | P (Max) | S (Max) | Si | Cr (Chromium) | Mo (Molybdenum) | Ni (Nickel) |
|---|---|---|---|---|---|---|---|---|
| AISI 4140 (Alloy) | 0.38 - 0.43% | 0.75 - 1.00% | 0.035% | 0.040% | 0.15 - 0.35% | 0.80 - 1.10% | 0.15 - 0.25% | - |
| EN8 / 1045 (Carbon) | 0.40 - 0.50% | 0.60 - 0.90% | 0.040% | 0.040% | 0.10 - 0.35% | - | - | - |
| AISI 4340 (Alloy) | 0.38 - 0.43% | 0.60 - 0.80% | 0.035% | 0.040% | 0.15 - 0.35% | 0.70 - 0.90% | 0.20 - 0.30% | 1.65 - 2.00% |
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) min. | Elongation (%) min. | Condition | Hardness (Brinell) approx. |
|---|---|---|---|---|---|
| AISI 4140 | 655 - 750 MPa | 415 MPa | 25% | Annealed | 197 - 212 HB |
| AISI 4140 (Q&T) | 850 - 1000 MPa | 650 MPa | 12 - 15% | Hardened & Tempered | 248 - 302 HB |
| EN8 / 1045 | 570 - 700 MPa | 300 MPa | 14 - 16% | Normalized | 170 - 210 HB |
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Specifications / Standards
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ASTM A322 / A29 (Hot Rolled Alloy) ASTM A108 (Cold Finished Carbon) AISI / SAE 4140, 4340, 8620, 52100 EN8, EN9, EN19, EN24, EN31 DIN 42CrMo4 / 1.7225 |
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Available Shapes
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Hot Rolled Round Bars Forged Round Bars (Rough Turned) Bright Drawn Bars Square & Flat Bars Hexagonal Precision Bars |
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Size Range
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Round Bars: 10 mm to 800 mm Diameter Bright Bars: 5 mm to 100 mm Diameter Length: 3 Meters to 6 Meters (Standard) (Large diameter forged shafts available up to 1200 mm for heavy industrial use) |
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Heat Treatment Condition
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Annealed (Soft) Normalized Quenched & Tempered (Q&T / Hardened) Stress Relieved Case Hardened (Carburized) |
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Tolerance Standards
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Hot Rolled: ASTM A29 / DIN 1013 Bright Drawn: h9, h10, h11 Forged: -0 / +5 mm (Strict straightness control for high-speed automatic lathe applications) |
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Surface Finish
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Black Mill Surface Peeled / Rough Turned Cold Drawn (Bright Finish) Centerless Ground / Polished |
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Testing & Certificates
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EN 10204 3.1 MTC Ultrasonic Testing (UT) Level S1/S2/S3 Jominy End-Quench Test (Hardenability) MPI (Magnetic Particle Inspection) Mechanical, Impact & Hardness verification |
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Export Packaging
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Bundled with High-Tensile Steel Strips Anti-Rust Oiling Edge Guards & HDPE Wrapping Color Stenciling on Bar Ends for Grade tracking |
Namo Alloy is a leading stockist and global exporter of premium Stainless Steel, Carbon Steel, and High Nickel Alloys.
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