... 7mm monel400 alloy seamless steel pipes1.mainly products are steel pipes and tubes 2.steel grade:austenitic ,duplex ,super duplex and alloy steel seamless ... and welded pipes and tubes1.outside diameter of steel pipes and tubes : 6mm- ... S31803,S32205 ,S32507 ,S32750 ,254SMO,904L8.high heat alloy seamless steel pipes and tubes : monel 400,inconel 600,601 , ...