Effect of microalloying and temperature at the end of hot rolling deformation on structure and properties of oil-and-gas line tubes made of 06x1 steel

Authors

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

Keywords:

low-alloy steel, niobium microalloying, hot deformation, tubes, microstructure, mechanical properties, corrosion resistance.

Abstract

Purpose.  Establish  effect  of  niobium  microalloying  and  hot  deformation  conditions  on  structure  and  quality characteristics of oil-and-gas line tubes made of 06X1 steel. Methodology. Methods used: qualitative and quantitative metallography, chemical  analysis,  corrosion  studies;  mechanical  property  tests  for  tension  and  impact  resistance. Findings. Effect  of  niobium microalloying of 06X1 steel hot worked at a tube rolling installation TRI «140» on structure, mechanical and corrosion properties of oil-and-gas line tubes has been established. It was shown that completion of deformation within an intercritical temperature range causes decrease in impact resistance at temperatures from -40 and – 60 С while high mechanical properties were retained in tensile tests.  Heating  of  tubes  to  temperatures  above Ас3 point  (normalizing  rolling)  before  their  rolling  at  a  sizing  mill  ensures  a high complex of  mechanical  properties including impact  resistance at subzero temperatures and high corrosion resistance properties of tubes. Originality. Microstructural features have been established and high mechanical and corrosion properties of oil-and-gas line tubes made of niobium microalloyed 06X1 steel have been scientifically substantiated. Practical value. The research results have been introduced at YuTiST Steel Tube Works (Nikopol, Ukraine) and can be used at other tube works in Ukraine. 

Author Biography

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

Cand. Sc. (Tech.)

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Published

2016-03-22

Issue

Section

Proceedings in memory of Starodubov