... 4.CERT: ISO9001:2000,CE,API,PED-97-23-EC The company now has four welded pipe production lines, two hot ... M19. With its oil castings products meeting the United States API 5CT Standard for the steel grade of H40, J55, K55, N80 ... steel products supplier in east part of China, the company has set up the perfect relationship with main steel groups in China, which ...