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在毛主席无产阶级革命路线指引下,1967年在贵阳钢铁厂兴建我国第一座成品钎杆专业化生产车间。贵阳钢铁厂在原冶金部钎钢工作队的研制基础上,1970年在河北铜矿作了22毫米六角成品钎杆的小批量试验,取得了优良成绩(在f=12～14的花冈岩上用YT-25型凿岩机打眼,平均寿命达253米/根;1969年在相同条件下瑞典成品钎杆的平均寿命为251米/根)。1973年4月,在江西洪都钢厂协助下,贵阳钢铁厂试验成功用合金毛管代替冷拔合金钢管生产中空钢,解决了大批生产
Guided by Chairman Mao’s proletarian revolutionary line, in 1967, Guiyang Steel Plant built China’s first specialized finished rod production workshop. Guiyang Iron and Steel Plant in the Ministry of Metallurgy on the basis of the research work of the brazing steel team, in 1970 at the Hebei Copper Mine made 22 mm hexagonal finished rod small batch experiments, and achieved good results (f = 12 ~ 14 spent on the rock YT-25 drilling machine drilling, the average life expectancy of 253 m / root; 1969 under the same conditions, the average life expectancy of Swedish finished rod is 251 m / root). April 1973, with the help of Hongdu Steelworks in Jiangxi Province, Guiyang Steel Plant successfully replaced hollow-alloy steel pipe with alloy capillary to produce hollow steel and solved the problem of mass production