GMW3399M-ST-S CR 490T/290Y-DP Dual Phase — Cold Rolled Steel

GMW3399M-ST-S CR 490T/290Y-DP is a dual phase grade cold rolled steel conforming to the gm material specifications. At 290 MPa minimum yield strength, this is intermediate-strength steel for structural cross-members, seat mounting brackets, and suspension component interfaces, with structural stamping capability for load-carrying components requiring consistent thickness reduction.

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

GMW3399M-ST-S CR 490T/290Y-DP is classified as a Dual Phase steel at 290 MPa yield and 490 MPa tensile. GMW3399M-ST-S CR 490T/290Y-DP at 290 MPa yield uses the dual-phase ferrite-martensite microstructure to deliver high work-hardening rates during forming, which translates to superior crash energy absorption in the finished component.

Ameristeel maintains a deep inventory of GMW3399M-ST-S CR 490T/290Y-DP in standard and custom gauges, available as coils, slit coils, sheets, or precision blanks. As a cold rolled product, GMW3399M-ST-S CR 490T/290Y-DP offers the tight thickness tolerances and controlled surface finish critical for visible and semi-exposed automotive applications. Every coil is third-party tested under our ISO 9001:2015 quality system.

GMW3399M-ST-S CR 490T/290Y-DP is supplied with the following coating options: hot-dip galvanized (zinc) for general corrosion resistance; galvanneal (zinc-iron alloy) for superior paint adhesion and weldability; electrogalvanized for precise coating weight control and smooth surface finish. At 290 MPa yield, the coating selection for GMW3399M-ST-S CR 490T/290Y-DP should account for forming severity and post-stamping corrosion exposure in the final application.

GMW3399M-ST-S CR 490T/290Y-DP at 290 MPa yield and 490 MPa tensile compares to GMW3032M-ST-S CR300LA (10 MPa lower yield at 300 MPa) and GMW3032M-ST-S HR300LA (10 MPa lower yield at 300 MPa). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.

GMW3399M-ST-S CR 490T/290Y-DP is an OEM-specific grade developed to meet General Motors engineering requirements for vehicle body and structural applications. Ameristeel supplies General Motors-specified steel grades directly to Tier 1 and Tier 2 automotive suppliers throughout Southeast Michigan, with full material traceability and third-party test reports on every coil. Our Fraser, MI steel processing facility maintains dedicated inventory of GMW3399M-ST-S CR 490T/290Y-DP to support just-in-time delivery schedules, and our ISO 9001:2015 quality system ensures that every shipment meets the exact mechanical property, surface quality, and dimensional tolerances required by General Motors production standards.

Ameristeel offers in-house processing for GMW3399M-ST-S CR 490T/290Y-DP at our Warren and Fraser, Michigan facilities. Available processing capabilities include precision slitting to custom widths on our multi-cut blanking line, cut-to-length sheet processing for exact dimensional requirements, laser cutting of high-strength profiles on our TRUMPF fiber laser with up to 4kW power, press brake forming on our TruBend series with up to 110-ton capacity and 120" bend length. From raw material sourcing through finished part delivery, Ameristeel provides a single-source solution — eliminating the need to coordinate between separate steel suppliers, service centers, and fabrication shops. Learn more about our laser cutting capabilities, production steel sales, or request a quote for processing GMW3399M-ST-S CR 490T/290Y-DP to your exact specifications.