No.18 April 2013 - Special Issue on "Steel Products for Energy Industries" and "Steel Sheets for Automotive and Electric Machinery and Appliance"

API X80 Grade Electric Resistance Welded Pipe with Excellent Low Temperature Toughness

NAKATA Hiroshi       KAMI Chikara       MATSUO Nobuyuki


This paper introduces nature and characteristics of the API X80 high frequency electric resistance welded (HFW) pipe. Thick-walled high strength line pipes are to be increasingly used for high pressure pipeline operation to improve the transportation efficiency for natural gas and oil. To improve the material properties of hot coil for X80, the effects of microstructure, chemical composition on strength and toughness were investigated. Based on this study, JFE Steel has developed low carbon bainitic ferrite steel with fine precipitates and no coarse pearlite and martensite by applying JFE Steel's thermomechanical controlled process (TMCP) technologies. Good balance of material properties of base material and seam weld suitable for low temperature use was obtained.

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