GMW3399M-ST-S HR780T/450Y-DP Dual Phase — Hot Rolled Steel

GMW3399M-ST-S HR780T/450Y-DP is a dual phase grade hot rolled steel conforming to the gm material specifications. At 450 MPa minimum yield strength, this is advanced-strength steel for B-pillar reinforcements, side impact beams, and roof bow structures, with high tensile capacity for safety-critical crash path components requiring controlled collapse behavior.

This specification carries the dual-phase (DP) designation under GMW3399M with ferrite-martensite microstructure for energy absorption in crash structures.

As a Dual Phase steel, GMW3399M-ST-S HR780T/450Y-DP offers a specific combination of strength and formability engineered for advanced automotive manufacturing. The dual-phase microstructure of ferrite and martensite provides excellent work hardening and crash energy absorption.

Ameristeel maintains inventory of GMW3399M-ST-S HR780T/450Y-DP in various gauges and widths, available as coils, sheets, or custom blanks. Our ISO 9001:2015 certified processes ensure consistent quality from prototype through production volumes.

Available coating options for GMW3399M-ST-S HR780T/450Y-DP include Galvanized, Galvanneal, Electrogalvanized, providing corrosion protection and surface preparation suited to your manufacturing process requirements.

GMW3399M-ST-S HR780T/450Y-DP at 450 MPa yield and 780 MPa tensile compares to GMW3032M-ST-S CR420LA (30 MPa higher yield at 420 MPa) and GMW3032M-ST-S HR420LA (30 MPa higher yield at 420 MPa). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.