RMS-1021 CR4-140Y-270T-M Mild Steel — Cold Rolled Steel

RMS-1021 CR4-140Y-270T-M is a mild steel grade cold rolled steel conforming to the rivian material specifications. At 140 MPa minimum yield strength, this is extra-deep-drawing mild steel, ideal for complex outer body panels, fenders, and intricate stampings where maximum elongation is essential, with gentle forming loads and excellent surface finish retention for Class A exposed surfaces.

The Class 4 designation indicates extra deep drawing quality for severe forming. Within the RMS family, different class numbers reflect progressively different ductility and elongation requirements to suit varying stamping complexity.

Ameristeel maintains inventory of RMS-1021 CR4-140Y-270T-M 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 RMS-1021 CR4-140Y-270T-M include Uncoated, Galvanized, Electrogalvanized, Galvannealed, Zinc-Magnesium-Aluminum, providing corrosion protection and surface preparation suited to your manufacturing process requirements.

RMS-1021 CR4-140Y-270T-M at 140 MPa yield and 270 MPa tensile compares to RMS-1021 CR1-140Y-270T-M (0 MPa lower yield at 140 MPa and 270 MPa vs 270 MPa tensile) and RMS-1021 CR2-140Y-270T-M (0 MPa lower yield at 140 MPa and 270 MPa vs 270 MPa tensile). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.