不锈钢:17-4PH(sus630)●特性及适用范围:添加铜的沉淀硬化型钢种。用于制造轴类、汽轮机部件。●化学成份:碳C:≤0.07硅Si:≤1.00锰Mn:≤1.00硫S:≤0.030磷P:≤0.035铬Cr:15.50~17.50镍Ni:3.00~5.00铜Cu:3.00~5.00铌Nb:0.15~0.45●力学性能:抗拉强度σb (MPa):480℃时效,≥1310; 550℃时效,≥1060; 580℃时效,≥1000; 620℃时效,≥930条件屈服强度σ0.2 (MPa):480℃时效,≥1180;550℃时效,≥1000;580℃时效,≥865;620℃时效,≥725伸长率δ5 (%):480℃时效,≥10;550℃时效,≥12;580℃时效,≥13;620℃时效,≥16断面收缩率ψ (%):480℃时效,≥40;550℃时效,≥45;580℃时效,≥45;620℃时效,≥50硬度:固溶,≤363HB和≤38HRC;480℃时效,≥375HB和≥40HRC; 550℃时效,≥331HB和≥35HRC;580℃时效,≥302HB和≥31HRC;620℃时效,≥277HB和≥28HRC