近几年来,我国从十二个国家进口热轧变形钢筋约八十万吨,其中从日本、荷兰、西班牙、西德等四国进口的约占进口总量的85％,仅日本一个国家就占进口总量的55％(其中SD35级钢筋比重最大)。由于施工部门缺乏国外钢筋技术资料,没有掌握进口钢筋技术性能和采用合理的焊接工艺以及焊工技术水平的关系,因此在施工中,有的钢筋 In recent years, China imported about 80,000 tons of hot-rolled deformed steel bars from 12 countries, of which imports from Japan, the Netherlands, Spain, and West Germany accounted for about 85% of the total import volume. Only one country in Japan accounted for 55% of total imports (of which SD35 grades are the largest). Due to the lack of foreign steel reinforcement technical materials in the construction department, the lack of mastery of the technical performance of imported steel bars, and the adoption of reasonable welding techniques and the relationship between the welder’s technical level, there are some steel bars in construction.