Effect of surface-active elements and temperature and deformation parameters on structure and intergranular corrosion resistance of tubes made of austenitic cr-ni and cr-ni-mo steels

Authors

  • T. А. Dergach Cand. Sc. (Tech.), Ukraine
  • S. A. Panchenko Cand. Sc. (Tech.), Ukraine

Keywords:

austenitic high-alloy steels, surface-active elements, cold-rolled tubes, deformation, quenching, initiating temper, grainboundary design, microstructure, corrosion resistance

Abstract

Abstract. Purpose: establishment of maximum permissible content of surface-active elements: carbon, boron, nitrogen and development of scientifically substantiated technological means ensuring high resistance to intergranular corrosion (IGC) of coldrolled tubes of austenitic chrome-nickel and nickel-chrome-molybdenum steels. Procedures. Methods of optical metallography, chemical analysis tests for resistance to IGC by methods of AMU and DU, GOST 6032 and mechanical tension properties were used. Methodology. Methods of optical metallography, chemical analysis, tests of IGC resistance according to standard GOST 6032 and mechanical properties (tensile tests) were used. Findings. Negative effect of carbon (above 0,025%) and boron (as a microadditives in quantities of 0,001…0,003%) on resistance of 03Х18Н11 and 03Х17Н14М3 steels to IGC in strong oxidizing media has been established. Scientific ideology based on the principle of grain-boundary design and the data on boron properties ensuring high resistance to IGC of cold-rolled tubes made from tubular billets of reduced corrosion resistance has been developed and realized.  Originality. Scientific ideology based on the principle of grain-boundary design ensuring formation of a structure containing  80% of special low-energy grain boundaries and high resistance to IGC of tubes made of austenitic Cr-Ni and Cr-Ni-Mo steels has been proposed. Practical value. The scientific solutions were introduced at CENTRAVIS PRODUCTION UKRAINE JSC, Nikopol, they contribute to enhancement of the production efficiency.

Author Biographies

T. А. Dergach, Cand. Sc. (Tech.)

Department of Materials and Materials Processing, SIHE «Prydniprovska State Academy of Civil Engineering and Architecture», St. Chernyshevsky, 24-а, 49600, Dnipropetrovsk, Ukraine

S. A. Panchenko, Cand. Sc. (Tech.)

РК «Plant of power engineer» LLK «ТММ - An Energyline-up management», St. Getman Yakov Оstryanin, 2, Kharkov region, Chuguyevskiy district, s.m. Malinovka, Ukraine

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Published

2017-03-28

Issue

Section

Proceedings in memory of Starodubov