... Size: 1/2"--48" (DN15--DN1200) 3, Certification:SGS Specialized in producing elbow Features: 1) Type: butt welded and seamless2) Size ... 321H, 310S, 347H,S31803,904L,)6) Applications range: For use in the petroleum, smelting, foodstuff, power, papermaking, chemical, medical equipment, aviation ... " as its purpose. With the efforts of all staff and the support of friends, the company now has become a ...