Multi Phase and Ultra High Strength Sheet Steel
|Publication Date:||1 November 2009|
This standard covers the requirements for continuous cast, hot rolled or cold rolled sheet steel with specified tensile strengths from 450 MPa through 1500 MPa.
Material Description. This standard applies to uncoated and coated, dual phase (ferrite + martensite) (DP), dual phase with high hole expansion (ferrite + bainite) (FB), transformation induced plasticity (ferrite + bainite + retained austenite) (TRIP or TR), multi-phase (ferrite + martensite + bainite + precipitation hardening) multi phase (MP) or martensitic (MS) materials. These products shall be supplied as coils or sheet. Hot rolled flat products are usually supplied in thicknesses greater than 1.80 mm. Cold 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 standard 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), Europe (E), Latin America (LAAM), and Asia Pacific (AP).
This revision includes a grade change based on global steel mill capability: CR980T/650Y-DP has been replaced by CR980T/700Y-MP. Effective the date of publication of this revision, steel used for parts containing the CR980T/650Y-DP specification shall meet the CR980T/700Y-MP requirements in this revision. New parts shall not contain the CR980T/650Y-DP specification.
In this revision, a new global grade has been developed and added to the specification, CR980T/700Y-MP-LCE. This grade is intended for roll forming and simple bending/flange applications and requiring high strength and good weldability. Consult manufacturing engineering prior to specifying this material for stamping applications.
Symbols. Not applicable.
Typical Applications. Typical applications include body panels, body structure members, chassis components and bumpers.