The present invention discloses a rolling process for high toughness hot bending elbow steel, which is suitable for rolling steel with high toughness and hot bending elbow. The quality of the steel is composed of carbon =0.06% ~ 0.08, silicon manganese =0.25 ~ 0.35, =1.40 ~ 1.50, P = 0.012, s = 0.0015, Nb =0.035 ~ 0.045, =0.010 ~ 0.015 titanium, nickel aluminum =0.02 ~ 0.04, =0.60 ~ 0.70, =0.28 ~ 0.32 vanadium molybdenum, copper =0.045 ~ 0.055, =0.15 ~ 0.20 the addition of nickel, =0.60 to 0.70 mass percentage of alloying elements in molybdenum, =0.28 ~ 0.32; the process comprises the following steps: slab heating, rough rolling, cooling and ultra fast cooling. Under the condition that the existing production condition is not changed, the special micro alloying component design is adopted, the unconventional control rolling and ultra fast cooling technology are adopted, the production link is simplified, the production cost is reduced, the energy is saved, and the environmental pollution is reduced.
【技术实现步骤摘要】
高韧性热煨弯管用钢轧制工艺
本专利技术属于轧钢
,涉及微合金化设计的热煨弯管用钢板的轧制工艺。
技术介绍
长距离油气输送管道通常要在恶劣气候条件运行,经常低温在零下几十度,油气输送管道工程用热煨弯管对用钢的性能也有很高的要求。中国正在铺设从俄罗斯境内经过东北后南行上海的全球著名中俄东线管道项目,管道途径9个省市区距离约3170公里,该项目所需热煨弯管用钢的韧性指标相当高,要求-45℃温度条件下夏比冲击值≥180J才能安全铺设和高效运营。
技术实现思路
本专利技术的目的是提供一种高韧性热煨弯管用钢轧制工艺,能轧制屈服强度≥555Mpa,抗拉强度≥625Mpa,-45℃实验温度条件下夏比冲击韧性Akv≥180J的热煨弯管用钢板。本专利技术通过下述技术方案予以实现:高韧性热煨弯管用钢的轧制工艺,钢的质量百分组成为:碳=0.06~0.08,硅=0.25~0.35,锰=1.40~1.50,磷≤0.012,硫≤0.0015,铌=0.035~0.045,钛=0.010~0.015,铝=0.02~0.04,镍=0.60~0.70,钼=0.28~0.32,钒=0.045~0.055,铜=0.15~0.20,合金元素的质量百分比中加入镍=0.60~0.70,钼=0.28~0.32。工艺步骤包括:(1)板坯加热:采用转炉煤气和焦炉煤气的混合煤气进行燃烧,其前后配比为8.5/1.5,热值9500~10000KJ,一加热段混合煤气流量为3000~3500m3/h,二加热段混合煤气流量为5500~6000m3/h,均热段混合煤气流量为3500~4000m3/h,220mm厚度板坯加 ...
【技术保护点】
高韧性热煨弯管用钢的轧制工艺,其特征在于:钢的质量百分组成为碳=0.06~0.08,硅=0.25~0.35,锰=1.40~1.50,磷≤0.012,硫≤0.0015,铌=0.035~0.045,钛=0.010~0.015,铝=0.02~0.04,镍=0.60~0.70,钼=0.28~0.32,钒=0.045~0.055,铜=0.15~0.20,合金元素的质量百分比中加入镍=0.60~0.70,钼=0.28~0.32;工艺步骤包括:(1)板坯加热:采用转炉煤气和焦炉煤气的混合煤气进行燃烧,其前后配比为8.5/1.5,热值9500~10000KJ,一加热段混合煤气流量为3000~3500m
【技术特征摘要】
1.高韧性热煨弯管用钢的轧制工艺,其特征在于:钢的质量百分组成为碳=0.06~0.08,硅=0.25~0.35,锰=1.40~1.50,磷≤0.012,硫≤0.0015,铌=0.035~0.045,钛=0.010~0.015,铝=0.02~0.04,镍=0.60~0.70,钼=0.28~0.32,钒=0.045~0.055,铜=0.15~0.20,合金元素的质量百分比中加入镍=0.60~0.70,钼=0.28~0.32;工艺步骤包括:(1)板坯加热:采用转炉煤气和焦炉煤气的混合煤气进行燃烧,其前后配比为8.5/1.5,热值9500~10000KJ,一加热段混合煤气流量为3000~3500m3/h,二加热段混合煤...
【专利技术属性】
技术研发人员:熊祥江,罗登,李中平,史术华,陈奇明,范明,
申请(专利权)人:湖南华菱湘潭钢铁有限公司,
类型:发明
国别省市:湖南,43
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