超超临界机组用P92钢焊接技术的研究

Study on Welding Procedure of P92 Steel Using in Ultra Supercritical Plants

新型马氏体耐热钢P92钢以其卓越的抗高温蠕变性能,成为超超临界火力发电机组的主蒸汽管道用材。文中对P92钢的焊接技术进行了较深入地探讨,对钢材的焊接性进行了试验研究,结合国内外标准及钢材的运行工况确定了焊接工艺评定合格的力学性能指标;对国外的几种焊接材料进行了力学性能和施焊工艺性对比,确定试验所用焊接材料;通过试验确定了此种耐热钢最佳的后热实施工艺,最终提出了符合规范的可行的P92钢焊接工艺和热处理工艺及控制措施。

For its remarkable high temperature creep strength property, the new creep resistant P92 martensite steel became the most promising materials used in the main steam tube for ultra supercritical fossil-fired power plants within the last years. Results of a research project for the P92 steel welding procedure were presented. The starting point of the job was to determine the weldability of P92 steel, then to decide mechanical property values according to the relative standards home and abroad and its characters in the operation. After many contract about mechanical and welding technical properties of several abroad welding materials, one brand weld materials was chosen for these experiment. Many experiments were done to get the best post-heat treatment technical for P92 steel. Through those investigations, the welding procedure, heat treatment technical and relative controlling measures feasible which conform to the standards have been gained.