4340 steel exhibits excellent low-temperature toughness.
4340 steel, through quenching and tempering, achieves an excellent balance of strength and toughness. Benefiting from its low low-temperature brittle transition temperature, it maintains good impact resistance even at -40°C, effectively preventing low-temperature brittle fracture. This is mainly due to the synergistic effect of the nickel-chromium-molybdenum alloy system, making its low-temperature toughness significantly superior to nickel-free medium-carbon alloy steels such as 4140 steel.
By further refining the grain size or optimizing the heat treatment process, 4340 steel can also withstand even lower service temperatures, meeting the stringent requirements of low-temperature, heavy-duty mechanical components.Learn More