scope:

The sheet metal material defined by this specification is applicable for the direct press hardening combined hot forming/die quenching) production process. The metallurgical concept conforms to cold rolled, fully killed, fine grained, boron treated steel. The steel substrate is hot dip aluminized coated (AlSi coated). Typical thickness range is 0.8 mm to 2.5 mm.

The material specification defines the properties of the sheet material as delivered to the press-shop in the soft condition before press hardening. Fully processed press hardened part requirements like mechanical properties or final coating layer structure shall meet the performance specification WSSM99P39- A1/A4

Flexibly rolled (Tailor Rolled Blank) material used for direct press hardening is covered by this specification, see paragraph 3.7 for details.

Tailor Weld Blanks may include a section made from material to WSS-M1A357-A1. The material callout section of the drawing has to show the material used for all sections and refer to the Ford Engineering Specification for TWB and additional requirements listed there.