论文部分内容阅读
我国生产的金刚石岩芯钻探用无缝钢管最高强度级别为DZ75钢级,但是只有DZ60可以大量供应。DZ75尚处于试生产阶段,产量少、质量差,远不能满足国内的需求。因此,矿产地质系统、煤炭系统、冶金系统都先后从国外进口钻探用无缝钢管补充国内数量和质量方面的不足。已经进口的岩芯钻探用无缝钢管有两种引进方式,一种是进口成套钻探设备带进了成套钻具,另一种是进口钻探用无缝钢管国内加工成钻具使用。我国主要是从日本进口,此外还有西德、美国和加拿大等国。据使用单位反映日本钢管的综合性能
China’s production of diamond core drilling seamless steel pipe with the highest strength level DZ75 grade, but only a large number of DZ60 supply. DZ75 is still in the trial production stage, less output, poor quality, far from meeting domestic demand. Therefore, mineral geological systems, coal systems, metallurgical systems have successively imported from the overseas drilling seamless steel pipe to supplement the domestic quantity and quality problems. Imported core drilling seamless steel pipe has two ways to import, one is imported complete sets of drilling equipment into a set of drilling tools, and the other is imported drilling seamless steel pipe processed into domestic use. China is mainly imported from Japan, in addition to West Germany, the United States and Canada and other countries. According to the unit to reflect the overall performance of Japanese steel pipe