40CrNiMoA SAE8640H Steel Round Bar / Alloy Rod AISI 4340 DIN1.6510
40CrNiMoA SAE8640H Steel Round Bar Hot Rolled Alloy Rod AISI 4340 DIN1.6510
40CrNiMoA steel round bar is devided into 40CrNiMoA hot rolled steel bar and 40CrNiMoA Forged steel bar. 40CrNiMoA round bar has high strength and hardness, good weldability, toughness, machinability and so on.
Common diameter for hot rolled steel bar:8mm to 80mm
Common diameter for forged steel bar: 80mm to 1200mm
Package: standard seaworthy packing or as customer required
Tolerance for the steel bar:
Diameter tolerance: 0~3mm, Length tolerance:0~20mm
Straightness: 3mm/1000mm
Delivery condition for 40CrNiMoA steel bar:
Hot forged +Normalized+rough turned Q/T:Quench+ Temper Annealing
EAF ARC FURNACE + LF REFINING+ VD + FORGING (DOUBLE) + FIXED LENGTH + SEP1921C/c TESTING
Equal material of 40CrNiMoA
| DIN | AISI | JIS | BS | Russia |
| 34CRNIMO6 | 4340 | SNCM439(SNCM8) | 871M40 | 40NiCrMo7 |
Chemical composition of 40CrNiMoA
| Grade | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 40CrNiMoA | 0.37~0.44 | 0.17~0.37 | 0.50～0.80 | ≤0.030 | ≤0.030 | 0.60~0.90 | 1.25~1.65 | ≤0.25 | 0.15～0.25 |
Mechanical property of 40CrNiMoA
| Grade | Tensile strength | Yield strength | Elongation | Impact value |
| σb (MPa) Min | σb (MPa) Min | δ5 (%)Min | Akv (J)Min | |
| 39CrNiMo3 | ≥980(100) | ≥835(85) | ≥12 | ≥78 |
40CrNiMoA steel round bar Application
Typical applications are for structural use, such as aircraft landing gear, power transmission gears and shafts and other structural parts.
Bebon international Co.,ltd is professional in steel bar. We are a large stockist of steel bar in China. We have almost 750 ton steel bar of 40CrNiMoA in stock. The stock size ranges from Φ80to Φ700. The common length for 40CrNiMoA steel bar is 3000mm, 6000mm, 9000mm. And the price is competitive. If your size can be picked in our warehouse, we can transport the products to the loading port in 3 days. So please be free to contact us if you require steel bar.
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