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一、前言冷拔异型钢管,是用一定尺寸的圆管坯,通过异型工具经多道次拔制而成。异型钢管是经济断面钢材之一。它不仅在受平面弯曲时强度高,而且在用于各部件时可节约大量金属。随着我国国民经济不断
I. Foreword Cold-drawn shaped steel pipe is a round tube with a certain size, shaped by a multi-pass tools drawn from. Shaped steel pipe is one of the economic sections. It not only has high strength when it is bent flat, but it also saves a lot of metal when used in parts. As China’s national economy continues