LEVEL WOUND COIL, METHOD FOR MANUFACTURING LEVEL WOUND COIL, CROSS FIN TUBE TYPE HEAT EXCHANGER, AND METHOD FOR MANUFACTURING CROSS FIN TUBE TYPE HEAT EXCHANGER

摘要

The present invention relates to a level wound coil in which a seamless pipe is aligned and wound in multiple layers in a cylindrical shape. The material of the seamless pipe wound around the level wound coil contains between 0.58 and 0.72 mass% of Sn, between 0.005 and 0.035 mass% of Zr, between 0.01 and 0.10 mass% of Fe, and between 0.004 and 0.040 mass% of P, and is a copper alloy made of a balance of Cu and unavoidable impurities. The ratio (t/D) of the thickness (mm) to the outer diameter (mm) of the seamless pipe wound around the level wound coil is 0.040 or less, the tensile strength of the seamless pipe wound around the level wound coil (sigmaB) is at least 280 MPa, the 0.2% proof stress (sigma0.2) is 180 MPa or less, and the elongation (delta) is at least 38%. The present invention can provide a seamless pipe that has high strength, can normally perform a hairpin bend, and is formed of copper alloy can be provided.