Heat Treating 4340 Alloy Steel

4340 has been used typically for parts requiring a through hardening capability up to 3 5 inches 89 mm in nominal thickness at time of heat treatment and subject to rigid magnetic particle inspection standards but usage is not limited to such applications.

Heat treating 4340 alloy steel.

Pacific 4340 is available in two conditions. 4340 heat treated hot rolled cold finished. Premium aircraft quality is intended for. Commercial and military aircraft automotive systems forged hydraulic and other machine tool applications forged steel crankshafts.

Aisi 4340 alloy steel is forged at 427 to 1233 c 1800 to 2250 f. Aisi 4340 alloy steel is heat treated at 830 c 1525 f followed by quenching in oil. Normalizing annealing hardening tempering spheroidization stress relief etc. The inclusion of nickel improves hardenability.

Alloy steel 4340 heat treatment including. 4340 steel heat treatment. A contemporary alternative to 4340 is atlas 6582 through hardening steel that has improved through hardening characteristics and. It can be through hardened in large sections.

Certificates with a traceable lot number are available for these products. Aisi 4340 is a heat treatable low alloy steel containing nickel chromium and molybdenum. Regarded industry wide for its toughness 4340 supplies high strength in the heat treated condition while still maintaining excellent fatigue strength over time. It is a nickel chromium molybdenum medium carbon alloy steel with deep hardenability.

Aisi 4340 alloy steel is heat treated at 830 c 1525 f followed by quenching in oil. 4340 alloy steel applications. Heat treated quenched and tempered to high strength or annealed for ease of machining and subsequent heat treatment. Download certificates from activity after your order ships.

Use 4340 alloy steel for power transmission and structural applications that involve extreme impact heat and wear. For technical drawings and 3 d models click on a part number. Aisi 4340 is a nickel chromium molybdenum alloy steel specification widely used in the oil and gas sectors. Heat to 845 to 900 c 1550 to 1650 f and hold for a period of time which depends on the thickness of the section.

As a quality grade alloy steel it offers toughness and high strength in the heat treated condition with good fatigue strength. As mentioned above pre hardened and tempered 4340 steel bars or plates can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of rc 50. Aisi 4340 alloy steel can be cold worked using all conventional methods in the annealed condition. Flame or induction hardening.

Atlas 4340 is a nominally 1 8 percent nickel chromium molybdenum low alloy steel of high hardenability with high strength and toughness in relatively large sections achieved with a quench and temper heat treatment. 4340 heat treat normalizing.