X120M管线钢管的JCOE制造技术

Formation of X120M Line Pipe Through JCOE Technique

钢管成型工序分为两部分,第一步是获得钢管成型后所需形状的曲率和椭圆度;第二步是得到焊接所要求的成型缝几何形状。JCO钢管成型首先是沿钢板的两边,通过板边预弯机获得所需的最小宽度150 mm的曲率,再经过JCO压力机成型为管线钢管。选择适当的模具硬度和曲率对钢管的成型起着至关重要的作用。模具主要参数是根据钢管的尺寸,即钢管直径、壁厚以及钢级等来确定的。另外,钢板的强度还取决于钢坯的化学成分、厚度、再加热温度、板坯下压量、初轧温度、精轧温度和最终加速冷却速率等因素。

The line pipe forming operation can be divided into two parts, first is to achieve the required shape in terms of curvature and ovality after formation of the line pipe, and the second part is to make right welding joint geometry. important operation is making the required curvature along the edges of TMCP and ACC plate for line pipe up to the 150 mm in width minimum and forming of the line pipe at JCO press. The selection of dies with proper hardness and curvature in both the operation plays a vital role in the formation of line pipes. The main parameters of selection dies are size of line pipe for which dies/tools are to be made i.e. the diameter of line pipe, thickness of line pipe and most important is grade of line pipe . In this process the strength level is achieved by the chemical composition of the slab, thickness of the slab, reheating temperature, roughing temperature at which reduction in the thickness, finish rolling temperature and finally the accelerated cooling temperature rate.