... Yanshan County Cangzhou City China.The following is the description of our production.StandardAPI 5CT, 5L; ASTM, BS, JIS, DINSteel GradeAPI ... with full production capacity, 4000,000tons per yearDelivery time20 daysQualificationindependent import and export qualificationsMain marketAsia, India, Middle East, America, Europe,etc. black seamless ...