... X70 Professional service and competitive price OD10.3 to 1016mm GOST 550 petroleum gas steel tubes International Standards:ISO3183 ,API 5L ... ,JIS G3465,SNI 07-0537,SNI 09-0728,IS1978,UNI8488,GOST 5501.Material: API5L A25,A,B,X42,X46,X52,X56 ... coating;Welcome contact us for order inquiry and best price!!! GOST 550 petroleum gas steel tubes