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α-相使1Cr18Ni9Ti的穿孔工艺塑性变坏,形成内折,造成大量废品。内折废品率随α-相级别的提高而增加;α-相的分布与形状对内折废品率也有很大影响。α-相的情况取决于化学成分,随着Cr与Ni的当量比的升高,内折废品率增加;适当降低Cr含量,增加Ni含量,可以得到较好的结果。统计结果表明,当Cr/Ni≤1.75时,内折废品率占4.5％,Cr/Ni>1.75％时,内折废品率占8.92％。 Ti/C≤8时,内折废品率占7.19％,Ti/C>8时,内折废品率占14.06％。因而适当地控制Ti/C值,不但对保证耐腐蚀性能是必须的,而且对保证钢管的冷热加工质量也是很重要的。
α-phase 1Cr18Ni9Ti perforation process of plastic deterioration, the formation of folding, resulting in a large number of waste. The rate of inner folded scrap increased with the increase of α-phase level. The distribution and shape of α-phase also had a great influence on the rate of inner scrap. The α-phase depends on the chemical composition. As the equivalence ratio of Cr to Ni increases, the rate of internal refolding increases; the Cr content and the Ni content can be properly reduced to obtain better results. The statistical results show that when the ratio of Cr / Ni≤1.75, the rate of end-folded scrap accounted for 4.5% and the rate of end-folded scrap accounted for 8.92% when Cr / Ni> 1.75%. When Ti / C≤8, the rate of internal folding scrap accounted for 7.19% and that of Ti / C> 8 accounted for 14.06%. Therefore, proper control of Ti / C value, not only to ensure corrosion resistance is necessary, but also to ensure the quality of hot and cold steel processing is also very important.