Effect of heat treatment on mechanical properties of expansion cone material

Sayyad Zahid Qamar*, Tasneem Pervez

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


AISI D6 is a high-carbon high-chromium cold-work tool steel. It has excellent resistance to wear and abrasion, high compressive strength, and good edge holding quality and dimensional stability. These properties make it an ideal choice for use as a tool for blanking, punching, cropping, shearing, trimming and clipping. One of its most promising and important applications is in the form of conical mandrel for expansion of steel tubulars used in oil and gas exploration. Solid Expandable Tubular (SET) technology is being successfully employed for various downhole applications such as slimming of oil and gas wells, and isolation of water-producing zones. The mandrel, made from a special material (generally D6 steel), is hydraulically pushed (or mechanically pulled) through a steel tubular. This cold work expands the tubular beyond its elastic region, causing permanent deformation. To withstand the high level of repeated thermo-mechanical stresses, cone material must have certain specific properties. The work reported in this paper covers heat treatment and mechanical testing of tensile and impact specimens of D6 tool steel. The heat treatment process consists of annealing, hardening/austenitizing, air or oil quenching, and single or double tempering. Mechanical testing includes hardness, tensile properties (elastic modulus, yield strength, ultimate strength, and ductility), and impact strength. Analysis of the test results leads to the identification of an optimal heat treatment sequence for D6 steel that would yield the best combination of desired properties for the expansion mandrel. Optimum material properties would ensure dimensional accuracy of the expanded tubulars and a longer mandrel life.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - International Petroleum Technology Conference 2012, IPTC 2012
PublisherInternational Petroleum Technology Conference (IPTC)
ISBN (Print)9781613991480
Publication statusPublished - Jan 1 2011
EventInternational Petroleum Technology Conference 2011, IPTC 2011 - Bangkok, Thailand
Duration: Nov 15 2011Nov 17 2011

Publication series

NameInternational Petroleum Technology Conference 2011, IPTC 2011


OtherInternational Petroleum Technology Conference 2011, IPTC 2011


  • Cold work
  • D6 steel
  • Expansion mandrel
  • Heat treatment
  • Mechanical properties
  • Solid expandable tubular
  • Tool steel

ASJC Scopus subject areas

  • Fuel Technology
  • Geochemistry and Petrology
  • Geophysics
  • Geotechnical Engineering and Engineering Geology


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