Standard Comporision:
| Country | German | USA | Japan | China | Russia | British |
| Standard | DIN/Wr. | ASTM/AISI | JIS | GB | GOST | BS |
| Grade | 1.6511/34CrNiMo4 | 4340 | SNCM439 | * | EN24/817M40 |
Chemical Composition:
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
| 4340 | 0.38-0.43 | 0.15-0.35 | 0.60-0.80 | ≤0.035 | ≤0.040 | 0.70-0.90 | 0.20-0.30 | 1.65-2.00 |
| 1.6511/36CrNiMo4 | 0.32-0.40 | ≤0.40 | 0.50-0.80 | ≤0.035 | ≤0.035 | 0.90-1.20 | 0.15-0.30 | 0.90-1.20 |
| 817M40 | 0.36-0.44 | 0.10-0.40 | 0.45-0.70 | ≤0.035 | ≤0.040 | 1.00-1.40 | 0.20-0.35 | 1.30-1.70 |
| SNCM439 | 0.36-0.43 | 0.15-0.35 | 0.60-0.90 | ≤0.030 | ≤0.030 | 0.60-1.00 | 0.15-0.30 | 1.60-2.00 |
Available Size:
| Shape: | Available Status | Available size(mm) |
| Plate | Y | 12-120*2000-2300*3000-5800 |
| Flat bar | Y | 12-120X155-710X2500-5800 |
| Sheet | Y | 1-10X155-710X2500-5800 |
| Block | Y | 100-300X610-1500X2500-5800 |
| Round bar | Y | Dia5-1200X2500-5800 |
| Hexagonal bar | N | * |
Delivery Condition:
Hot rolled/Forged+Black surface/Peeled/Rough turned
Delivery time:
Warehouse regular stock sizes:3-7 days
Mill manufacture sizes:15-60 days
Brief introduction:
AISI 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. AISI 4340 is also one kind of nickel chromium molybdenum steels. 4340 alloy steel is generally supplied hardened and tempered in the tensile range of 930 – 1080 Mpa. Pre hardened and tempered 4340 steels can be further surface hardened by flame or induction hardening and by nitriding. The 4340 steel has good shock and impact resistance as well as wear and abrasion resistance in the hardened condition. AISI 4340 steel properties offer good ductility in the annealed condition, allowing it to be bent or formed. Fusion and resistance welding is also possible with our 4340 alloy steel. ASTM 4340 material is often utilized where other alloy steels do not have the hardenability to give the strength required. For highly stressed parts it is excellent choice. AISI 4340 alloy steel can also be machined by all customary methods.
Application:
Aircraft Landing Gear,Automotive,Oil and Gas Drilling,Forging,Warm and Cold Forming,Machine Building,Transfer Systems, like power transmission gears and shafts.General engineering industries and structural use applications, such as: heavy duty shafts, gears, axles, spindles, couplings, pins, chucks, molds etc.
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