Multi-Phase and Ultra-High Strength Sheet Steel
|Publication Date:||1 September 2018|
This specification covers the requirements for continuous cast, hot rolled or cold rolled sheet steel with specified tensile strengths from 450 MPa through 1700 MPa.
Material Description. This specification applies to uncoated and coated, dual phase (ferrite + martensite) (DP), ferrite-bainite with high hole expansion (FB), multi-phase (ferrite + martensite + bainite + precipitation hardening) (MP), complex phase (ferrite + martensite + bainite + precipitation hardening) (CP), and martensitic (MS) materials. These products shall be supplied as coils or sheets. Hot rolled flat products are usually supplied in thicknesses > 1.80 mm. Cold and hot rolled flat products with the appropriate surface type and surface finish are suitable for the application of surface coatings, metallic hot dipping, electrolytic plating, hot spray painting, organic coatings and/or other coatings. This specification does not apply to steel for case hardening and cold reduced, work hardened strips. Additional requirements or agreements have to be specified by local business units, e.g., North America (NA), Latin America (LA), and Asia Pacific (AP). Multi-phase (MP), complex phase (CP), and martensitic (MS) steels shall only be used for roll forming, simple bending/flange applications, and targeted stamping applications as approved by GM Materials and Manufacturing Engineering.
Symbols. Not applicable.
Applicability. Typical applications include body panels, body structure members, chassis components, reinforcements for enhanced strength and vehicle impact performance, and bumpers.