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Specification And Types of Carbon Steel Flanges (1) - Download - 4shared - texas flange Carbon steel is the kind of steel that contains a carbon content of up to 2.1% by weight. AISI defines carbon steel as: Maximum Mn 1.65%, Si 0.06% Specified minimum of Cu shall not exceed 0.04%. No alloy element (minimum content) is required for Cr, Mo, Ni, Ti, Va, etc.