Heat-treatable steels are in the mechanical construction steel range. They are characterized by carbon content usually in excess of 0.25%, and may or may not be alloys.
Heat-treatable steels are used to fabricate parts that require a combination of strength and tenacity, with relatively uniform values throughout the cross section or down to a certain depth. These properties are attained by means of quenching and tempering, which comprise the heat-treatment process.
Medium hardenability. Has the best mechanical characteristics compared with other steel types in the same category.
Medium to large parts that require a high level of strength and tenacity, such as arms and wheelends.
COPANT 8640; SAE 8640; AISI 8640; UNS G86400; DIN 40NiCrMo2-2 (1.6546);
Chemical Composition (% BY WEIGHT)
0,38 – 0,43
0,75 – 1,00
0,15 – 0,35
0,40 – 0,70
0,40 – 0,60
0,15 – 0,25
THERMAL TREATMENT AND PROCESSING TEMPERATURES (°C)