RMS-1021 CR-440Y-780T-DP Dual Phase — Cold Rolled Steel

RMS-1021 CR-440Y-780T-DP is a dual phase grade cold rolled steel conforming to the rivian material specifications. At 440 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.

RMS-1021 CR-440Y-780T-DP is classified as a Dual Phase steel at 440 MPa yield and 780 MPa tensile. RMS-1021 CR-440Y-780T-DP at 440 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 carries RMS-1021 CR-440Y-780T-DP across a range of gauges and widths in cold rolled form, available as coils, sheets, or custom-cut blanks. With 440 MPa minimum yield strength, this dual phase specification requires precise handling and testing — our ISO 9001:2015 certified processes include third-party laboratory verification on every incoming coil.

RMS-1021 CR-440Y-780T-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; zinc-magnesium for enhanced edge and cut-edge corrosion protection; aluminized for high-temperature oxidation resistance. At 440 MPa yield, the coating selection for RMS-1021 CR-440Y-780T-DP should account for forming severity and post-stamping corrosion exposure in the final application.

RMS-1021 CR-440Y-780T-DP at 440 MPa yield and 780 MPa tensile compares to RMS-1021 CR-450Y-780T-TR (10 MPa lower yield at 450 MPa and 780 MPa vs 780 MPa tensile) and RMS-1021 CR-420Y-480T-LA (20 MPa higher yield at 420 MPa and 780 MPa vs 480 MPa tensile). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.

RMS-1021 CR-440Y-780T-DP is an OEM-specific grade developed to meet Rivian engineering requirements for vehicle body and structural applications. Ameristeel supplies Rivian-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. As an EV-platform specification, RMS-1021 CR-440Y-780T-DP addresses the unique structural and lightweight demands of battery electric vehicle architecture, including battery enclosure protection and optimized crash energy management. Our Fraser, MI steel processing facility maintains dedicated inventory of RMS-1021 CR-440Y-780T-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 Rivian production standards.

Ameristeel offers in-house processing for RMS-1021 CR-440Y-780T-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 RMS-1021 CR-440Y-780T-DP to your exact specifications.