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由于螺旋浆在船舶中所处的重要作用和恶劣的工作环境,其材质通常采用高强度黄铜ZHMn55—3—1。我厂采用砂模铸造锰黄铜螺旋浆,抗拉强度稳定在55～62Kg/mm~2,硬度HB113～124,分别比GB340—64高22～37.8％和25.6～37.8％。一、熔炼工艺 1、一次熔炼法(焦炭坩埚炉) 浇注小型螺旋浆或同牌号其它船用件时、使用焦炭坩埚炉、采用一次快速熔炼法。 1)炉料配比:Cu(Cu4以上,99.5％)55％;Mn(JMnl,96％)3.5％;Fe(低碳钢车屑烧去油污或2″新铁钉)1％;Zn(Zn5以上)41％。
Due to the important role of the propeller in the ship and the harsh working environment, the material is usually made of high strength brass ZHMn55-3-1. Our factory uses sand mold casting manganese brass propeller, the tensile strength is stable at 55 ~ 62Kg / mm ~ 2, hardness HB113 ~ 124, respectively, than the GB340-64 high 22 ~ 37.8% and 25.6 ~ 37.8%. First, the smelting process 1, a melting method (coke crucible furnace) pouring small propeller or the same number of other marine parts, the use of coke crucible furnace, using a rapid melting method. 1) Charge ratio: 55% for Cu (99.5% over Cu4), 3.5% for Mn (JMn1, 96%), 1% for Fe Above) 41%.