研究了热处理对采用电炉+炉外精炼(LF)+电渣重熔冶炼的工业用和实验室50 kg真空感应炉+电渣重熔冶炼的试验用0Cr12Mn5Ni4Mo3Al高强度不锈钢带(0.8 mm和0.5 mm)的力学性能和组织的影响。结果表明,实验室得到的钢材更为洁净,组织中保留有合理的残余奥氏体含量;与采用同样热处理制度的工业钢带相比,在保持或提高伸长率的同时,抗拉强度提高50~85 MPa,杯突值提高1~3 mm;适当调节Cr、Ni的当量比以及采用合理的锻造、轧制工艺可以消除钢带组织中δ铁素体的不利影响,更大限度发挥材料潜力。
0Cr12Mn5Ni4Mo3Al stainless steel strips, 0.5 mm and 0.8 mm in thickness, made from ingots prepared by EAF+LF+ESR and laboratory 50 kg VIM+ESR were studied. The results show that labstrips were cleaner and had appropriate residual austenite. Compared with industrial strips, tensile strength and cupping values of labstrips were higher by 5085 MPa and 13 mm respectively with same elongation. The proper Crq/Niq ratio and forging, rolling technology could give better structure with less influence of δferrite.
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