Manufacturer of premium 300mm diameter 40Cr alloy steel round billets. Perfect for high-stress components, shafts, and heavy machinery parts. Request a quote today.
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Product details
Our 300mm diameter Round Billet is manufactured from high-quality 40Cr alloy steel (equivalent to ASTM 5140), offering exceptional strength, toughness, and wear resistance for the most demanding industrial applications. This large-diameter billet combines chromium alloy enhancement with precise manufacturing processes to deliver superior mechanical properties. The 40Cr grade provides excellent hardenability and fatigue resistance, making it ideal for critical components in automotive, aerospace, and heavy equipment industries where reliability and performance are paramount.
| Product Name | Alloy Steel Round Billet |
| Material Standard | GB/T 3077-2015 |
| Steel Grade | 40Cr |
| Equivalent Grades | AISI 5140, JIS SCr440, DIN 1.7035 |
| Shape | Round |
| Nominal Diameter | 300 mm |
| Diameter Tolerance | ± 3.0 mm |
| Standard Length | 3000mm, 6000mm |
| Length Tolerance | +100/-0 mm |
| Chemical Composition (GB/T 3077-2015) | |
|---|---|
| Element | Content (%) |
| Carbon (C) | 0.37 – 0.44 |
| Silicon (Si) | 0.17 – 0.37 |
| Manganese (Mn) | 0.50 – 0.80 |
| Chromium (Cr) | 0.80 – 1.10 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.30 |
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