alloy pipe used to petroleum cheminal power and gas alloy pipe Seamless steel pipe1. out Diameter: 21.3mm - 350mm2. Thickness: 0.6mm -20.0mm3. Steel Grade: Q195-Q345, 10#-45#4. Standard: GB/T 3091-2001, BS1387-1985, DIN EN10025, EN10219, ASTM SCH40, ASTM SCH805. Surface Finish: Galvanized, electro galvanized, black25*2.5-3-676*4-5-6-8-10146*6-8-10-14245*35-40-45-50480*10-12-14-1828*2-5-676*12-16- ...