... Seamless steel tubes for liquid service(1)Standard: GB8163-99(2)Material (grade): 20, Q345 and so on.(3)Mainly used in the transmission fluid ... A53,ASTM A106,AP25L,API5CT, GB8162, GB8163, GB3087, seamless steel pipe. we also supply an extensive range of steels, ... as" angles, flat steel, square steel, welded pipe, galvanized pipe, steel mill, hot-rolled steel, I-steel, channel steel, wire rod and the ...