In Drawn and Ironed (D&I) two-piece can manufacturing, the metal cup is forced through concentric ironing dies to thin the sidewall while maintaining base thickness. Tinplate (low-carbon steel sheet electroplated with tin) is considered superior due to its high tensile modulus and the lubricity of the soft metallic tin layer, which acts as a solid lubricant inside high-speed multi-stage ironing dies without galling.