our company offers inexpensive and high-quality alloy pipe O.D.:14mm-426mm W.T.:2mm-60mm Boiler Steel Pipe1. Material: 10, 20, 20G, 20MnG, 25MnG, 15MoG, 12Cr1MoVG, SA106B, SA335 P11, SA 335 P22, ST45.8, 15Mo3, SA210C, SA192, STB 340, P235TR2 etc.2. Standard: GB5310, GB3087, ASTM A106, ASTM A213, ASTM A210, ASTM A179, ASTM A192, ASTM A333, ASTM A335, JIS G3461, JIS G3462, DIN17175, BS3059, EN ...