AISI 4340 Alloy Steel

About AISI 4340 Alloy Steel

Owing to our rich experience in this domain, we are involved in manufacturing and supplying a wide assortment of 4340 Alloy Steel to our honorable clients. It is composed of iron, nickel, carbon, and manganese. This alloy steel has bulk modulus of around 140 GPa and yield strength of around 470MPa. It is widely used in aircraft landing gear, forging, oil & drilling, and machine building. Further, it also finds application in manufacturing of heavy-duty shafts, gears, axles, spindles, couplings, pins, chucks, and molds. Apart from this, 4340 Alloy Steel is obtainable at very economical price keeping in mind budget of customers. Technical Specification Grade C Mn P S Si Ni Cr Mo 4340 0.38-0.43 0.60-0.80 0.035 max 0.040 max 0.15-0.35 1.65-2.00 0.70-0.90 0.20-0.30 Physical Properties Thermal Conductivity at C W / (m*K) 20 40.5 350 32.5 700 25.5 Heat Treatment Soft Annealing C 650-700 Cooling Slowly Hardness HB max. 280 Stress-relief Annealing C 630-650 Cooling Furnace 1st Pre-Heating C up to approx. 400 in an air-circulating furnace 2nd and 3rd 780 and 1000 Hardening C 1190-1230 Quenching at least 520C Oil, Air Tempering C at least twice 530-560 Hardness after Temperature HRC 64-66