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4330M ALLOY STEEL

4330M ALLOY STEEL hardened and tempered high strength alloy steel is a high strength alloy that has exceptional low temperature impact properties.

4330M ALLOY STEEL is tempered based on the desired state level. This alloy steel is tempered at 454 to 635°C (850 to 1175°F) for the lower strength 125 to 200 ksi level. AISI 4330 alloy steel is tempered at 218 to 260°C (425 to 500°F) for the 260 to 280 ksi level. Tempering is not recommended for strength levels in the 220 to 260 ksi range as this will lead to degradation of impact strength.

Annealing

AISI 4330 alloy steel can be completely annealed at 816 to 899°C (1500 to 1650°F). The alloy is then cooled slowly in the furnace and finally cooled in air.

Heat Treatment

AISI 4330 alloy steel is heated to 829°C (1525°F) and then quenched in oil. AISI 4330 alloy steel can also be heat treated to strength levels of 200 ksi or greater than 200 ksi, by first being normalized at 899°C (1650°F) before the heat treatment and then quenched to gain strength.

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