... heat exchangermiddle pressure boiler tube10#20#16Mn<Q345A.B.C.D.E>GB3087-2008ASTM A106 ... # 20# Q295ASTM A106A,B,CA53A,B16Mn<Q345A.B.C.D.E>GB/T8163-2008ASTM ... pipe10# 20# 45# 27SiMnASTM A53A,B16Mn<Q345A,B,C,D,E> 20Cr 40Cr 20CrMo ... ERW steel pipe20# Q195 Q215A,BQ235A,B Q345A,B,C,D,EGB/T13793-1992GB3091-200132 ... pressure fluid transportSpiral steel pipe Q235A-B Q345A-ESY/T5037-2000219-2820*4-20apply to ...