首页> 外国专利> HIGH STRENGTH API-X80 GRADE STEELS FOR SPIRAL PIPES WITH LESS STRENGTH CHANGES AND METHOD FOR MANUFACTURING THE SAME

HIGH STRENGTH API-X80 GRADE STEELS FOR SPIRAL PIPES WITH LESS STRENGTH CHANGES AND METHOD FOR MANUFACTURING THE SAME

机译：强度变化较小的螺旋管用高强度API-X80等级钢及其制造方法

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摘要

The present invention relates to a small spiral steel pipe humul hot-rolled high strength API-X80 grade steel, and a manufacturing method for the intensity variation after Tube Mill, more particularly niobium, which is added to the low-carbon aluminum killed steel (Nb), titanium (Ti), molybdenum (Mo), nickel (Ni) content, and they adequately control the rate and the carbon equivalent between, and by appropriately controlling the heating temperature, reduction ratio and cooling rate during hot rolling to be formed in the steel is fine deposits from the pipe API-X80 of and steel for line pipe having a grade strength (yield strength of 552MPa or more) relates to a method of manufacturing the same. According to an aspect of the invention, C in weight%: 0.05 ~ 0.075%, Mn: 1.65 ~ 1.85%, Si: 0.20 ~ 0.35%, Nb: 0.055 ~ 0.085%, Ti: 0.02 ~ 0.06%, Ni: 0.20 ~ 0.45%, Mo: 0.30% or less, N: 0.004 ~ 0.008, and balance of Fe and other unavoidable impurities in the composition which is component the absolute value of the Ti-3.42N-4C-1.5S within a range of 0.15 to 0.31, a Ceq satisfies 0.45 or less, and occupies at least 75% acicular ferrite with an area fraction of the internal tissues, and there is provided a hot-rolled high strength API X80-grade steel sheet characterized in that at the same time contains less than 3% in the pearlite. ; Ceq = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15 ; Line pipe, X80, roughing, finishing rolled, high strength, low temperature toughness, pearlite

机译：本发明涉及一种小螺旋钢管的胡木热轧高强度API-X80级钢，以及在向低碳铝镇静钢中添加管轧机，特别是铌后强度变化的制造方法。 Nb），钛（Ti），钼（Mo），镍（Ni）的含量，并通过适当控制形成的热轧时的加热温度，压下率和冷却速度来适当地控制它们之间的比率和碳当量。本发明涉及一种钢中的，具有等级强度（屈服强度为552MPa以上）的管道API-X80的细小析出物和管线管用钢。根据本发明的一个方面，C的重量％：0.05〜0.075％，Mn：1.65〜1.85％，Si：0.20〜0.35％，Nb：0.055〜0.085％，Ti：0.02〜0.06％，Ni：0.20〜 0.45％，Mo：0.30％以下，N：0.004〜0.008，组成中Ti-3.42N-4C-1.5S的绝对值的组成中的Fe和其他不可避免的杂质的余量为0.15〜0.35％。 0.31，Ceq满足0.45以下，且针状铁素体的组织组织占面积的比例至少为75％，提供了一种热轧高强度API X80级钢板，其特征在于，同时含有珠光体中少于3％。 ; Ceq = C + Mn / 6 +（Cr + Mo + V）/ 5 +（Ni + Cu）/ 15;管线管，X80，粗加工，精轧，高强度，低温韧性，珠光体

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公开/公告号KR100868423B1

专利类型
公开/公告日2008-11-11

原文格式PDF
申请/专利权人
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申请/专利号KR20060134189
发明设计人 김덕규;양승우;김기수;배진호;
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申请日2006-12-26
分类号C22C38/00;C21D8/06;
国家 KR
入库时间 2022-08-21 19:14:25

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