ASTM · ASTM B543

Welded Tubes per ASTM B543 Standard: Technical Specifications and Alloys

Technical Purpose and Application Areas

The ASTM B543 specification defines regulated requirements for welded tubes with a diameter not exceeding 31/8 inches. This rolled product is manufactured from high-purity copper and specialized copper alloys. The primary scope of application for these products includes the manufacture of high-efficiency tubular heat exchangers, condenser systems, evaporator units, and critical components in the mechanical engineering sector. EV Group China supplies material that meets strict engineering tolerances for operation under conditions of high thermal loads.

The list of approved alloys includes the following grades according to UNS classification:

Alloy Designation (UNS) Type of Metallurgical Composition
C10800Oxygen-free copper with controlled phosphorus content
C12200Phosphorus-deoxidized copper (high residual content)
C19400Copper-iron alloy system
C23000Red brass
C44300Arsenical admiralty brass
C44400Antimonial admiralty brass
C44500Phosphorized admiralty brass
C68700Arsenical aluminum brass
C70400Copper-nickel (95-5 ratio)
C70600Copper-nickel (90-10 ratio)
C70620Copper-nickel (90-10), adapted for welding
C71000Copper-nickel (80-20 ratio)
C71500Copper-nickel (70-30 ratio)
C71520Copper-nickel (70-30), adapted for welding
C71640Complex copper-nickel-iron-manganese alloy
C72200Specialized copper-nickel alloy