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Microstructure, mechanical properties and hydrogen induced cracking susceptibility of X80 pipeline steel with reduced Mn content

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
585
Identifiers
DOI: 10.1016/j.msea.2013.07.055
Keywords
  • X80 Pipeline Steel
  • Manganese
  • Microstructure
  • Hic Susceptibility
  • Mechanical Properties

Abstract

Abstract A low carbon X80 pipeline steel with reduced Mn content has been thermomechanically processed. The microstructure, mechanical properties and susceptibility of the steel to hydrogen induced cracking (HIC) were studied. Yield strength levels up to 595MPa, tensile strength levels up to 721MPa and toughness levels up to 100% of shear area at −15°C for drop wear tear test (DWTT) were achieved while no HIC crack was observed. The microstructure predominantly consisted of acicular ferrite (AF) together with small amount of granular bainite (GB) and martensite/austenite (M/A) constituent. The microstructure also contained high dislocation density and dislocation substructure. Precipitates of different morphologies and size ranges were observed and include cuboidal (70–100nm), irregular (80–120nm), spherical (30–70nm) and fine precipitates (5–10nm). The results indicate that the X80 steel with reduced Mn content is suitable for sour service application.

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