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1992~1993年,西北有色金属研究院采用自己研制的特殊加工技术,成功的制出壁厚相差0.7mm的高档登山车用钛合金双向变径变壁异型管,并投入批量生产,月产
From 1992 to 1993, the Northwest Nonferrous Metal Research Institute successfully developed its titanium alloy bi-directional variable-geometry wall-shaped pipe for high-grade mountain bike with a difference of 0.7mm in wall thickness by using the special processing technology developed by itself.