SEDL / STP / STP672-EB / STP36868S

Controlled Processing of Molybdenum Bearing Line Pipe Steels

Delvecchio, GW
Research investigator, assistant research manager, and research associate, The Steel Company of Canada, Hamilton, Ontario

Hood, JE
Research investigator, assistant research manager, and research associate, The Steel Company of Canada, Hamilton, Ontario

McCutcheon, DB
Research investigator, assistant research manager, and research associate, The Steel Company of Canada, Hamilton, Ontario

Pages: 24    Published: Jan 1979

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Abstract

Low-carbon Mn-Mo-Cb acicular ferrite steels are being used by several steel companies for higher strength line pipe above API X60. The molybdenum addition is made to achieve a continuous stress-strain curve that gives higher strength in the final pipe than that obtainable from conventional ferrite-pearlite steels. In this paper, the effects of chemistry and controlled rolling on plate and pipe properties are described for a series of steels: low-carbon Mn-Mo-Cb, low-carbon Mn-Mo-Cb-V, and low-carbon Mn-Cb-V. Low carbon Mn-Mo-Cb steels are shown to give the best combination of pipe properties for up to X70 level with thickness as high as 12 mm.