ArcelorMittal S.A.
Method of producing press-hardened and coated steel parts at a high productivity rate

Abstract:

A part obtained by austenitization followed by hot stamping and hardening by holding in the stamping tool a sheet or blank is provided, including, a steel substrate, a precoating having at least one layer of aluminum or aluminum alloy, a microstructure of a steel substrate including martensite and/or bainite, a coating on at least one face of the steel substrate resulting from the interdiffusion between the steel substrate and the pre-coating and an oxide layer overlying the coating, an average content by weight of oxygen between 0 and 0.01 .mu.m below a surface of the part being less than 25%, and the average percent by weight of oxygen between 0.1 and 0.2 .mu.m below the surface being less than 10%.