... (Japan), and GL (Germany).Certified by API (the American Petroleum Institute).Our Factory specializes in the production of various cold-drawing and hot ... steel tubes of Φ8-159×1-20mm in thickness. And the varieties include: Low/medium pressure boiler pipe, high pressure ... , marine pipe, hollow sucker rod, oil cracking tube, tubing, American standard tube, European standard tube, etc. It has an annual ...