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CN102605246A 一种低应变时效敏感性焊接结构用钢及其生产方法 失效 - 权利终止 转让

一种低应变时效敏感性焊接结构用钢及其生产方法
摘要：
本发明涉及屈强比小于0.8的低应变时效敏感性焊接结构用钢及生产方法。其组分及重量百分比为：C：0.08～0.16％，Si：0.15～0.50％，Mn：1.02～1.80％，P≤0.010％，S≤0.005％，Nb：0.012～0.045％，Ti：0.005～0.032％，Als：0.015～0.060％，Ca：0.0015～0.008％，[N]：10～40×10-4％，[O]≤20×10-4％，[H]≤1.5×10-4％，并满足公式：1.95％≤6.0C+Mn≤2.3％，[N]+[O]+[H]≤50×10-4％，P+S≤0.010％。其步骤：冶炼及脱硫；在钢包处理；真空处理；连铸；对铸坯加热及高压除鳞；粗轧；精轧；层流冷却；自然冷却至室温。本发明可使低温应变时效敏感性由现有的40％降到20％及以下甚至10％以下，抗震性能即屈强比ReL/Rm≤0.80。
摘要（英）：

The invention relates to steel for a low-strain-ageing sensitive welding structure with the yield ratio smaller than 0.8 and a production method of the steel. The steel consists of components including, by weight percentage, from 0.08 to 0.16% of C, from 0.15 to 0.50% of Si, from 1.02 to 1.80% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, from 0.012 to 0.045% of Nb, from 0.005 to 0.032% of Ti, from 0.015 to 0.060% of Als, from 0.0015 to 0.008% of Ca, from 10 to 40X10-4% of [N], smaller than or equal 20X10-4% of [O] and smaller than or equal to 1.5X10-4% of [H], and the components meet the formulas including that 6.0C+Mn is larger than or equal to 1.95% and smaller than or equal to 2.3%, [N]+[O]+[H] is smaller than 50X10-4%, and P+S is smaller than or equal to 0.010%. The production method includes steps: smelting and desulfurizing; treating in a ladle; realizing vacuum treatment; continuously casting; heating and realizing high-pressure descaling for a casting blank; roughing; precisely rolling; realizing laminar cooling; and naturally cooling to reach room temperature. Low-strain-ageing sensitivity can be reduced to 20%, below 20% and even below 10% from existing 40%, and a seismic performance, namely the yield ratio ReL/Rm, is smaller than or equal to 0.80.

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