Cold drawn seamless steel pipe manufacturers _ Owen for (certified) _ Yantai cold drawn steel tubes supplied by Owen Steel Co., Ltd., Shandong. Owen Steel Co., Ltd., Shandong (www.hfggxs.com) is specialized in "alloy seamless steel pipe, precision seamless, fluid seamless steel tubes, welded steel pipe," the enterprise, the company of "honesty, hard service" concept, To provide you with the highest quality products and services. Welcome to inquire! Contact: Dengpei Sheng. Shandong Huafeng Steel Pipe Co., Ltd. is a company specializing in cold-drawn seamless steel pipe, steel pipe, precision steel, special steel pipe, welded pipe production and sales of the modern enterprise. The main production steel grades: 10,20,35,45, 40cr, 42crmo etc. consultation precision cold drawn steel plant, but also supply other brands of precision seamless steel tubes. The main production base: Shandong, Jiangsu, Chengdu, Tianjin, Hebei and other national standard precision steel; GB / T699-2008 thick-walled seamless cold drawn steel tubes, the national standard precision steel; GB / T3639-2008, in addition there may also Application GB / T8162-2008 precision steel structures. Shandong Huafeng Steel Pipe Co., Ltd. is a professional seamless steel pipe, steel pipe, precision steel, special steel pipe, welded pipe production and sales of the modern enterprise. Precision steel oil quenching can lead to deterioration of the surface. Since the surface-active, can occur significantly thin carburizing temperature at short film role, in addition, carbon black and oil in the adhesive surface heat treatment process is very unfavorable for simplification. Development of vacuum hardening technique include research performance, single-station gas quenching furnace.