焊管与无缝管的经济研究

Study on Economy Consideration Between Welded and Seamless Pipe

用一套φ１１４ｍｍ高频焊管机组与一套φ１１４ｍｍ斜轧穿孔──顶管──张力减径机组两种工艺方式同时生产管径３２～１１４ｍｍ，壁厚小于６ｍｍ的流体输送管、结构管、低中压锅炉管和Ｊ５５石油油管，在两套机组都不考虑热处理和管加工的条件下，进行主要消耗指标和不同供坯方式下生产费用的比较。得出：①靠外购坯料生产钢管的厂家，其经济性最终取决于热轧钢卷和管坯的差价，二者价格越接近越有利于焊管。②对使用自产管坯的厂家，在生产壁厚小于６ｍｍ钢管时，一般焊管费用低。③无缝管轧机生产壁厚大于６ｍｍ的无缝钢管比较经济。

Two mills, φ114mm high frequency welding pipe mill and φ114mm tilt roll passing-braving pipe reducing tension mill, produced simultaneously the pipes with φ32- 114mm less than 6mm in thickness, as forfluid transportation pipe, structure pipe, low and medium pressure boiler pipe and J55 petroleum pipe. Themain consumption and producing expense with different offering blank way were compared with two millswithout considering heat -treatment and pipe machining. The result are: 1. to the pipe manufacturer purchasing blank, the economy consideration was finally decided by balance of expenses between hot- rolledsteel coil and pipe blank. More nerely the two expenses was, more advantageous the welded pipe. 2. to thepipe manufacturer using self-produced pipe blank, the expense of welded pipe less than 6mm in thicknesswas lower. 3. the seamless pipe can not be replaced by the welded pipe in economy consideration as the thickness is more than 6mm.