SHANGHAI UNITE STEEL
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SAE4340 Forged alloy steel, Forged steel bar, DIA 80-1200mm
Application
Components for the aircraft, automotive and general engineering industries eg. Propeller shafts, connecting rods, gear shafts, and other automobile parts. Heavy forgings, eg. Rotors, shafts, discs.
Equivalent Grades:
| SAE | 4340 | JIS | SNCM439 |
| Greman W.Stoff No. | 1.6582 | GB | 40CrNiMoA |
| BS | 816M40 | EN | 24 |
Chemical composition:
| C | Si | Mn | P | S | Cr | Ni | Mo |
0.38-0.43 | 0.15-0.35 | 0.60-0.80 | 0.035 max | 0.040 max | 0.7-0.9 | 1.65-2.0 | 0.2-0.3 |
Mechanical Properties:
| Tensile strength | Yield strength | Elongation rate | Contractibility rate | Impact Energy | Hardness (HBS100/3000) |
| ≥980MPa | ≥835MPa | ≥12% | ≥55% | ≥78J | ≤269 |
SPECIFICATION OF ALLOY STEEL AISI4340 ROUND BARS:
| Diameter: | 80mm-1200mm (optional) |
| Length: | 1000mm-12000mm Straightness: 3mm/M max(optional) |
| Process: | Forged from vacuum degassed ingots. |
| Delivery condition: | Hot forged Rough machined (black surface after Q/T) Turned (optional) |
| Delivery Time: | 10-40 days |
| Heat treatment: | Normalized / Annealed / Quenched / tempered (optional) |
| Technical Data: | According to the customer's requirement of Chemical Composition, Physical Properties and Mechanical Testing |
| Test: | Ultrasonic test according to SEP 1921-84 Class C/c and D/d (optional) |
| Marking: | Grade, heat NO. length will be stamped one each bar with required color |
