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H68黄铜有极为良好的塑性和较高的强度,可切削加工性能好,易焊接,对一般腐蚀非常安定,但易产生腐蚀开裂。
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为普通黄铜中应用最为广泛的一个品种。H68黄铜性能与H70极相似,但冷作时有,"季裂"倾向,用作复杂的冷冲件和深冲件,如波纹管,枪弹炮弹弹壳等
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化学成份
铜 Cu :67.0~70.0
锌 Zn:余量
铅 Pb:≤0.03
磷 P:≤0.01
铁 Fe:≤0.10
锑 Sb :≤0.005
铋 Bi:≤0.005
注:≤0.3(杂质)
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力学性能
抗拉强度 σb (MPa):≥370
伸长率 δ10 (%):≥15
伸长率 δ5 (%):≥18
注 :棒材的纵向室温拉伸力学性能
试样尺寸:直径或对边距离5~12
H68黄铜热处理规范:热加工温度750~830℃;退火温度520~650℃;消除内应力的低温退火温度260~270℃。