X5CrNiCuNb17-4-4（1.4548）X5CrNiCuNb16-4沉淀硬化型不銹鋼

X5CrNiCuNb17-4-4特性及適用范圍：

添加銅的沉淀硬化型鋼種。用于制造軸類、汽輪機部件。

化學成份：

碳 C ：≤0.07

硅 Si：≤1.00

錳 Mn：≤1.00

硫 S ：≤0.030

磷 P ：≤0.035

鉻 Cr：15.50～17.50

鎳 Ni：3.00～5.00

銅 Cu：3.00～5.00

鈮 Nb：0.15～0.45

力學性能：

抗拉強度 σb (MPa)：480℃時效,≥1310; 550℃時效,≥1060; 580℃時效,≥1000; 620℃時效,≥930

條件屈服強度 σ0.2 (MPa)：480℃時效,≥1180;550℃時效,≥1000;580℃時效,≥865;620℃時效,≥725

伸長率 δ5 (％)：480℃時效,≥10;550℃時效,≥12;580℃時效,≥13;620℃時效,≥16

斷面收縮率 ψ (％)：480℃時效,≥40;550℃時效,≥45;580℃時效,≥45;620℃時效,≥50

硬度 ：固溶,≤363HB和≤38HRC;480℃時效,≥375HB和≥40HRC; 550℃時效,≥331HB和≥35HRC;580℃時效,≥302HB和≥31HRC;620℃時效,≥277HB和≥28HRC

●熱處理規范及金相組織：

熱處理規范：1)固溶1020～1060℃快冷;2)480℃時效,經固溶處理后,470～490℃空冷; 3)550℃時效,經固溶處理后,540～560℃空冷; 4)580℃時效,經固溶處理后,570～590℃空冷;5)620℃時效,經固溶處理后,610～630℃空冷。

金相組織：組織特征為沉淀硬化型。

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