SAE 4340 Steel Hardness
AISI 4340 Alloy Steel (UNS G43400) 4340 steel is a high-strength, low-alloy steel that contains chromium, nickel, and molybdenum. It's known for its toughness and offers superior impact properties to 4340 at equivalent strength levels. Related Specifications. Atlas 4340 low-alloy steel bar complies with grade AS1444, The step-by-step procedure in hardening and tempering 4140 carbon steel. The recommended temperature in hardening and Heat Treating and Brine Quench of Pre/Post Machined 4340 Nickel Alloy Steel ...