GMW3399M-ST-S CR 690T/550Y-DP Dual Phase — Cold Rolled Steel

GMW3399M-ST-S CR 690T/550Y-DP is a dual phase grade cold rolled steel conforming to the gm material specifications. At 550 MPa minimum yield strength, this is ultra-high-strength steel for door intrusion beams, bumper reinforcements, and tunnel 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 CR 690T/550Y-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 CR 690T/550Y-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 CR 690T/550Y-DP include Galvanized, Galvanneal, Electrogalvanized, providing corrosion protection and surface preparation suited to your manufacturing process requirements.

GMW3399M-ST-S CR 690T/550Y-DP at 550 MPa yield and 690 MPa tensile compares to GMW3032M-ST-S HR550LA (0 MPa lower yield at 550 MPa) and GMW3399M-ST-S CR 980T/550Y DP (0 MPa lower yield at 550 MPa and 690 MPa vs 980 MPa tensile). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.