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US09540717B2 High strength hot-rolled steel sheet for welded steel line pipe having excellent souring resistance, and method for producing same 有权
耐酸性优异的焊接钢管线用高强度热轧钢板及其制造方法

High strength hot-rolled steel sheet for welded steel line pipe having excellent souring resistance, and method for producing same
Abstract:
A steel material containing 0.01% to 0.07% C, 0.40% or less Si, 0.5% to 1.4% Mn, 0.1% or less Al, 0.01% to 0.15% Nb, 0.1% or less V, 0.03% or less Ti, and 0.008% or less N on a mass basis, Nb, V, and Ti satisfying Nb+V+Ti
Abstract(Chinese):

含有0.01％〜0.07％C，0.40％以下的Si，0.5％〜1.4％的Mn，0.1％以下的Al，0.01％〜0.15％的Nb，0.1％以下的V，0.03％以下的Ti，以及 0.008％以下的N，满足Nb + V + Ti <0.15（满足0.12以下的Cm）的Nb，V和Ti被加热至1,100℃至1250℃的加热温度， 以930℃以下的温度的累积压下率为40〜85％，成品轧制温度为760℃〜870℃的方式轧制，冷却至500℃的冷却停止温度 ℃以上，平均冷却速度为30℃/秒〜200℃/平方厘米的中心温度，冷却停止后自然冷却10多秒， 并在400℃的卷取温度下卷绕至620℃

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