Summary
The rapid progress in understanding the metallurgy of ferrite-pearlite steels has led to the development of high-strength, tough pearlite-reduced steels capable of meeting stringent Arctic line pipe specifications. The classical Nb or Nb-V pearlite-reduced steels may be used in cold climates although it appears that heavy controlled-rolling schedules are required to produce X70 properties in heavy-wall (19-mm) pipe. These steels have been shown to provide a dequate properties in thinner sections. Recent commercial experience with a molybdenum-modified pearlite-reduced steel has confirmed the laboratory results for longitudinally welded pipe reported in the present paper. The Mo-Nb steel exhibited a yield strength in excess of 480 MPa, coupled with good toughness in a 19.7-mm-thick wall pipe. This steel was not subjected to heavy controlled rolling and the finish-rolling temperature was 760°C. Spiral-welded X70 pipe has been commercially produced using the Mo-Nb pearlite-reduced steel, and laboratory results predict that a pipe yield strength of at least 540 MPa should be attainable in similar steel compositions when tested to API specifications. The probable introduction of new processing techniques, e.g., water cooling, either during rolling or after rolling, will undoubtedly upgrade pearlite-reduced steels for application under more demanding conditions.
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Plenum Publishing Corporation is indebted to Climax Molybdenum Company, a division of AMAXIncorporated, 1 Greenwich Plaza, Greenwich, Connecticut 06830, for providing the original English version of this article.
Published in Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 37–40, July, 1977.
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Tither, G., Lauprecht, W.E. Pearlite-reduced HSLA steels for line pipe. Met Sci Heat Treat 19, 543–555 (1977). https://doi.org/10.1007/BF00673544
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DOI: https://doi.org/10.1007/BF00673544