... machining parts, precision parts2) Material: brass, titanium, aluminum, stainless steel, lower-carbon steel, and so on.3) finish: zinc plated, chorme, polish ... our company: Originally established in Oct. 1996, Qingdao Jingliang Machinery CO.,Ltd is one of the pioneer companies specializing in precision work ... -step service to satisfy the customers and repay the society. steel pipe heat treatment