4340 alloy steel is an iron-based alloy containing nickel, chromium and molybdenum. The relatively high carbon content makes this alloy have excellent strength, toughness and ductility in applications with severe service conditions. In addition, the alloy is not easy to embrittle.
Supply Form & Size
Form of Supply | Size(mm) | Length(mm) |
Round bar | 6.0mm-1200mm | 2.5m-10m |
Chemical Composition&Related Specifications
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
4340 | 0.38~0.43 | 0.15~0.35 | 0.6~0.80 | ≤0.035 | ≤0.040 | 0.70~0.90 | 0.20~0.30 | 1.65~2.00 |
Brand comparison table
AISI/SAE | DIN/EN | BS | JIS/KS | China |
4340,E4340 | 36CrNiMo4(1.6511) | 36CrNiMo4(1.6511) | SNCM439 | 40CrNi2MoA |