高温轧制工艺(HTP)：新一代高温轧制工艺（HTP）是生产可焊接的高强度低合金钢中厚板和板卷的经济型技术。国际上成功的生产和应用实践经验证明：HTP工艺可用于高强度管线钢（X70-X120）和高强度建筑、造船等结构钢的生产。
一个钢管的生产流程如下：圆管坯放在要被切割的高温轧制线上，继续升温，穿孔，轧制直到管坯大小基本成型。
The process of a pipe production is the following: a round cast workpiece is put onto a hot rolling line where it is cut, heated, stitched and rolled till a pipe of necessary size is ready.
微观组织观察表明，在锻造或高温轧制状态下获得了以低碳马氏体为主，含少量贝氏体和残余奥氏体的复合组织。
Observations showed that the micro-structure of the steel after forging or high temperature rolling was composed of low-carbon martensite, a little part of bainite and residual austenite.
因为钢及其大多数合金在轧制时都需加热至高温。
Because steel and most of its alloy are heated to very high temperature when they are rolled.
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