... kinds of structure low-medium pressure boiler and locomotive boilerTransmission fluid tube 10#,20#,ASTM A106A,B,C,A53A,B 16Mn ... .E>GB/T8163-2008ASTM A106/A538-1240OD*1-200WTFor conveying fluid general seamless steel pipesStructure steel pipe 10#,20#,45#,27SiMnASTM ... -ESY/T5037-2000219OD-2820*4-20WTFor conveying the low pressure fluid