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几年前,C3F(法国铸锻公司)的Pamiers工厂对护环用的耐腐蚀18-18钢进行了一项研究。这项广泛的试验是和法国电力公司共同进行的。由于进行了这项试验,才决定用NMF18钢护环装备法国核电站900～1300MW发电机(NMF18是C3F公司给18-18合金钢定的牌号)。迄今为止,已经制造了20个护环。这些护环,外径为1746～2040mm,厚度为83～90mm,高度为700～775mm,重2.5～3.5t。能够保证的壁厚二分之一处的屈服强度,依护环型号的不同,分别是750、850或900MPa。作者研究了18-18钢的性能及其同常规的18-4钢的比较结果,以及这项试验项目的主要成果之后,在文中对这些大型护环的制造方法和设备作了详细说明。
A few years ago, C3F (French Casting Company) Pamiers factory on the use of corrosion-resistant ring 18-18 steel conducted a study. This extensive trial is carried out with EDF. As a result of this test, it was decided to equip the French nuclear power plant with 900 ~ 1300MW generator with NMF18 steel retaining ring (NMF18 is C3F’s designation for 18-18 alloy steel). To date, 20 retaining rings have been manufactured. The grommet, the outer diameter of 1746 ~ 2040mm, a thickness of 83 ~ 90mm, a height of 700 ~ 775mm, weight 2.5 ~ 3.5t. The guaranteed yield strength at half the wall thickness, depending on the type of guard ring, is 750, 850 or 900 MPa, respectively. After studying the performance of 18-18 steels and their comparison with conventional 18-4 steels and the main results of this pilot project, the method and equipment for manufacturing these large retaining rings are described in detail in this paper.