... rolled steel pipe1. Product name: Seamless steel pipe/steel pipe/boiler tube/2. Place of Origin: China Tianjin3. Material: 20# ... .Application:The products are widely used in fertilizer, petroleum, boiler, power station, centrastation,shiping military, chemical industry, environment ... ,ASTMA192,CA335,ASTMA333,DIN1629,ASTM A500-98,ASTM A500-98,ASTM A501-9JIS G3444-19948,ASTN A519-98,JISG3441-1994,ASTMA53 ...