... wellsAPE SPEC 5LA, B, X42APISeamles Steel Tubesand Pipes forHigh Pressure BoilerGB5310-199520G, 20MnG, 25MnG, 15MoG, 20MoG, 12Cr1MoVG, ... DIN 17175-1979 BS3059Part 21990Seamless Steel Tubesfor low and Medium Pressure BoilersGB3087-199910, 20ASTM A179, ASTM A192 ASTM ... SA179,SA192,BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, Q345, Q390, ...