... 1/2"--48" (DN15--DN1200) 3, Certification:SGS Specialized in producing elbow Features: 1) Type: butt welded and seamless2 ... 321, 321H, 310S, 347H,S31803,904L,)6) Applications range: For use in the petroleum, smelting, foodstuff, power, papermaking, chemical, ... medical equipment, aviation, boiler heat exchanger, and other fields.7) ...