ASTM B111 C44300 Tin Brass

ASTM B111 Copper Tube PDF

C44300 Tin Brass is a special copper-zinc alloy belonging to the Admiralty Brass series under the US ASTM standard. It exhibits excellent corrosion resistance, mechanical properties, and processability. Its chemical composition is based on a copper (Cu) matrix with a content ranging from 70.0% to 73.0%, zinc (Zn) as the primary alloying element (the remainder), and 0.9% to 1.2% tin (Sn) and 0.02% to 0.10% arsenic (As).

The addition of tin significantly enhances the alloy's corrosion resistance, particularly in inhibiting dezincification corrosion. Trace amounts of arsenic further enhance grain boundary stability, slowing the corrosion process. Furthermore, the content of impurities such as lead (Pb) and iron (Fe) is strictly limited (typically Pb ≤ 0.07%) to ensure material purity.

Physical Properties: Density approximately 8.53 g/cm³, slightly higher than ordinary brass but still lighter than most corrosion-resistant metals; electrical conductivity 28% IACS, thermal conductivity approximately 109 W/(m·K), suitable for applications requiring both electrical conductivity and heat dissipation.
Mechanical Properties: Tensile strength approximately 330-380 MPa in the annealed state, reaching 500-600 MPa after cold working; elongation ≥40% in the annealed state, maintaining 15%-25% in the cold-rolled state, demonstrating high ductility.
Corrosion Resistance: Excellent corrosion resistance in seawater, freshwater, and chlorine-containing media, with significant resistance to dezincification (passing the ASTM B858 dezincification test). The upper temperature limit for long-term use is approximately 200°C. Tin and arsenic synergistically form a dense oxide film, effectively resisting seawater corrosion and stress corrosion cracking.

Marine Engineering: Ship condenser tubes, desalination plant piping, subsea valve components, heat exchangers, evaporators, and other equipment, capable of withstanding seawater corrosion and erosion.
Energy and Chemical Industry: Power plant condenser tubes, refinery heat exchanger tubes, and nuclear power plant cooling systems, suitable for high-temperature, high-pressure, and corrosive environments.
Building HVAC: Air conditioning and refrigeration copper pipes, hot water pipelines, particularly suitable for environments containing chlorine.

Forming Process: Hot rolling temperature is recommended to be controlled between 700-800°C; cold working requires controlled deformation (typically ≤50%) to avoid cracking.
Welding and Joining: Inert Gas Shielded Welding (TIG) or brazing is preferred, offering superior weldability compared to lead brass.
Surface Treatment: Acid pickling (a mixture of nitric acid and sulfuric acid) can be used to remove the oxide layer, or tin plating can be used to enhance corrosion resistance.

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As a professional enterprise dedicated to global copper product trade since 2008, GNEE Metal Group deeply recognizes the quality and responsibility embodied in the ASTM B111 standard. This standard not only specifies chemical composition and mechanical properties but also represents a comprehensive quality commitment spanning manufacturing processes to testing and verification. GNEE solemnly assures global customers that every ASTM B111-standard condenser tube and copper alloy tubing we supply will strictly adhere to its requirements for seamless manufacturing, annealing treatment, eddy current testing, and various mechanical performance tests. 

 

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