ASTM A29/A29m Hot Rolled Alloy Steel Round Bars SAE4340 10-350mm Diameter High Strength
High-strength chromium molybdenum alloy steel round bars with diameters ranging from 10mm to 350mm, manufactured to ASTM A29/A29m standards for demanding industrial applications.
| Product Type | Diameter/Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|---|
| Round Bar | 16-600 | / | 3000-6000 |
| Plate | 16-200 | 200-800 | 3000-6000 |
Custom specifications available upon request
| Element | 40CrNiMo (%) | 4340 (%) |
|---|---|---|
| C (Carbon) | 0.37-0.44 | 0.38-0.43 |
| Si (Silicon) | 0.17-0.37 | 0.15-0.35 |
| Mn (Manganese) | 0.50-0.80 | 0.60-0.80 |
| P (Phosphorus) | ≤0.025 | ≤0.035 |
| S (Sulfur) | ≤0.025 | ≤0.040 |
| Cr (Chromium) | 0.60-0.90 | 0.70-0.90 |
| Ni (Nickel) | 1.25-1.65 | 1.65-2.00 |
| Mo (Molybdenum) | 0.15-0.25 | 0.20-0.30 |
- Chromium molybdenum alloy steel composition
- High strength and exceptional toughness
- Excellent hardenability and anti-overheating stability
- Superior high tensile strength with outstanding shock resistance
| GB | AISI | DIN | JIS | EN | TOCT | ISO |
|---|---|---|---|---|---|---|
| 40CrNiMoA | 4340 | 1.6582 | SNCM439 | 41NiCrMo 7-3-2 | 40XH2MA (40XHMA) | 36CrNiMo4 |
- Heavy machinery and high-load shafts
- Rotor shafts and turbine blades
- Critical components requiring nitriding treatment
- High-performance industrial machinery parts
- 20ft Container: Gross Weight 27T (5.80m × 2.13m × 2.18m)
- 40ft Container: Gross Weight 27T (11.8m × 2.13m × 2.18m)
- Standard Products: 15-20 days
- Customized Products: 30-50 days
Our facility is equipped with comprehensive processing equipment including sawing machines, grinding equipment, and polishing machines to meet custom specification requirements.
We are a professional special steel company established in 2005, specializing in high-quality steel products including Plastic Mould Steel, Hot Work Mould Steel, Cold Work Mould Steel, Alloy Structural Steel, Tool Steel, Stainless Steel, Carbon Steel, and Forged Blocks.
We maintain strategic partnerships with leading Chinese steel manufacturers including Baosteel Group, Dongbei Special Steel, Changcheng Special Steel, Hongsheng Heavy Industry, Xingcheng Special Steel, and Daye Special Steel to ensure consistent product quality.
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Have questions about our products or want to discuss a custom order? Our team is ready to help you.