Characteristics

Engineering steels are among the steels for mechanical construction and are characterized by a carbon content generally above 0.25%, and can be alloyed or unalloyed.

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 obtained through heat treatments such as quenching and tempering, which constitute the process known as beneficiation.

Applications

Medium to large sized parts for which a high degree of strength and toughness is required, such as arms and shaft ends.

Similar

COPANT 8640; SAE 8640; AISI 8640; UNS G86400; DIN 40NiCrMo2-2 (1.6546).

Chemical Composition (% by weight)

CMnPSSiNiCrMoV
0,38 - 0,430,75 - 1,000,0300,0400,15 - 0,350,40 - 0,700,40 - 0,600,15 - 0,25-

Heat Treatment and Processing Temperatures (°C)

Max ForgingAnnealingNormalizingQuenchingQuenching MediumCarburizingTempering
1.204 - 954815 - 875845 - 900830 - 855Oil--

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