QSn7-0.2锡磷青铜因具有较高的强度和硬度,同时又具有很好的抗磨性,所以在机械工业中大量用于制造耐磨零件(如:轴承、轴套、螺母、蜗轮等)。由于QSn7-0.2中的铜、锡、磷形成熔点为628℃的三元共晶体,产生“热脆性”导致热塑性变形能力下降。因此,在大量的文献、资料中认为QSn7-0.2只适宜于冷态变形加工。在1980年以前,我厂都采用冷镦工艺。冷镦粗坯料后,再经机加工出各种零件内孔 QSn7-0.2 tin phosphor bronze because of its high strength and hardness, but also has good abrasion resistance, so in the machinery industry for the manufacture of wear-resistant parts (such as: bearings, bushings, nuts, worm wheels, etc.) . As QSn7-0.2 in the copper, tin, phosphorus melting point of 628 ° C to form a ternary eutectic, resulting in “hot brittleness” lead to decreased thermoplastic deformability. Therefore, a large number of literature, data that QSn7-0.2 only suitable for cold deformation. Before 1980, I used cold heading process. Cold heading up rough, and then by machining a variety of parts within the hole