hebei zhonghai steel pipe manufacturing corporation , have the huge investment and import The international advanced seamless steel pipe and spiral equipment . By constantly improving our quality, the products have successfully occupied a large portion in the competitive domestic and foreign markets. Its perfect and standard management organization has passed the certification of ISO9001-2000 International Quality Control System, manufacturing certificate and the export authority license. Our products is mainly exported all over the world including South East Asia, Middle East, Europe, North...