Carbon steel tubes to be used for heat exchangers, condensers, and similar heat-transfer apparatus. Tubes shall be made by electric-resistance welding. Test report required (see Certification Section of Specification A 450/A 450M) Chemical Composition Carbon, max % 0.18 Manganese, % 0.27 to 0.63 Phosphorus, max, % 0.035 Sulfur, max, % 0.035 Mechanical Tests Required Flattening Test, Flange Test, Reverse Flattening Test, Hardness Test, Hydrostatic or Nondestructive Electric Test,
