RMS-1021 HR-340Y-410T-LA HSLA — Hot Rolled Steel

RMS-1021 HR-340Y-410T-LA is a hsla grade hot rolled steel conforming to the rivian material specifications. At 340 MPa minimum yield strength, this is medium-strength structural steel for longitudinal rails, shotgun members, and frame reinforcement channels, with structural stamping capability for load-carrying components requiring consistent thickness reduction.

RMS-1021 HR-340Y-410T-LA is a Low Alloy / HSLA steel at 340 MPa yield and 410 MPa tensile. Micro-alloying elements in RMS-1021 HR-340Y-410T-LA — typically niobium, vanadium, or titanium — provide grain refinement and precipitation strengthening, delivering structural-grade mechanical properties with good weldability and formability for automotive and industrial applications.

Ameristeel carries RMS-1021 HR-340Y-410T-LA across a range of gauges and widths in hot rolled form, available as coils, sheets, or custom-cut blanks. With 340 MPa minimum yield strength, this hsla specification requires precise handling and testing — our ISO 9001:2015 certified processes include third-party laboratory verification on every incoming coil.

RMS-1021 HR-340Y-410T-LA 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 340 MPa yield, the coating selection for RMS-1021 HR-340Y-410T-LA should account for forming severity and post-stamping corrosion exposure in the final application.

RMS-1021 HR-340Y-410T-LA at 340 MPa yield and 410 MPa tensile compares to RMS-1021 CR-340Y-410T-LA (0 MPa lower yield at 340 MPa and 410 MPa vs 410 MPa tensile) and RMS-1021 CR-330Y-590T-DP (10 MPa higher yield at 330 MPa and 410 MPa vs 590 MPa tensile). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.

RMS-1021 HR-340Y-410T-LA 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 HR-340Y-410T-LA 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 HR-340Y-410T-LA 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 HR-340Y-410T-LA 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, shear processing for rapid sheet production. 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 HR-340Y-410T-LA to your exact specifications.