Manufacturing method of hot forged products using brass, hot forged products, and wetted products such as valves and faucets formed using the same

摘要

Focusing on the relationship between the dezincing resistance of copper alloys and the grain size of the α phase, and contributing to the improvement of dezincing resistance of copper alloys. Specifically, hot forging using lead-free brass A method for manufacturing a hot forged product using brass that can ensure corrosion resistance such as predetermined dezincing resistance even in parts having different thicknesses and shapes, and a hot forged product and Provide wetted products such as molded valves and faucets. Brass having at least Cu: 59.2 to 63.0 mass%, Sn: 1.00 to 2.00 mass%, Pb: 0.05 to 0.25 mass%, the balance being composed of Zn and inevitable impurities Therefore, the material to be forged using this brass was heat-treated at a heating rate of 5.2 ° C./s or more from 350 ° C. to the forging temperature.