RMS-1021 HR3-180Y-270T-M Mild Steel — Hot Rolled Steel

RMS-1021 HR3-180Y-270T-M is a mild steel grade hot rolled steel conforming to the rivian material specifications. At 180 MPa minimum yield strength, this is formable mild steel suited for door inners, floor pans, and moderate-draw closure panels, with gentle forming loads and excellent surface finish retention for Class A exposed surfaces.

The Class 3 designation indicates deep drawing quality for complex formed parts. Within the RMS family, different class numbers reflect progressively different ductility and elongation requirements to suit varying stamping complexity.

Ameristeel stocks RMS-1021 HR3-180Y-270T-M in a range of thicknesses and widths for structural and forming applications. As a hot rolled product, this specification is supplied in coils, cut sheets, or blanked parts. Our dedicated purchasing team sources RMS-1021 HR3-180Y-270T-M through direct mill relationships, and every incoming coil is third-party tested under our ISO 9001:2015 quality management system.

RMS-1021 HR3-180Y-270T-M 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 180 MPa yield, the coating selection for RMS-1021 HR3-180Y-270T-M should account for forming severity and post-stamping corrosion exposure in the final application.

RMS-1021 HR3-180Y-270T-M at 180 MPa yield and 270 MPa tensile compares to RMS-1021 HR2-180Y-270T-M (0 MPa lower yield at 180 MPa and 270 MPa vs 270 MPa tensile) and RMS-1021 CR-180Y-290T-BH (0 MPa lower yield at 180 MPa and 270 MPa vs 290 MPa tensile). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.

RMS-1021 HR3-180Y-270T-M 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 HR3-180Y-270T-M 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 HR3-180Y-270T-M 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 HR3-180Y-270T-M 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 for complex profiles and prototypes on our TRUMPF fiber laser systems, 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 HR3-180Y-270T-M to your exact specifications.