The development of dual phase steels for the manufacture of high strength fasteners without heat treatment

The development of dual phase steels for the manufacture of high strength fasteners without heat treatment

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Recently, Corus has developed a steel which can be used for 8.8-type strength applications without the requirement for final quenching and tempering, offering significant cost savings. Corus has achieved this objective by selecting a chemical analysis which, in combination with a purpose-designed controlled cooling regime in the rod mill, generates a dual phase microstructure. This structure provides an excellent combination of strength and ductility due to the controlled dispersion of martensite in a ferrite matrix, and offers potential benefits for many fastener applications.

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Description

Recently, Corus has developed a steel which can be used for 8.8-type strength applications without the requirement for final quenching and tempering, offering significant cost savings. Corus has achieved this objective by selecting a chemical analysis which, in combination with a purpose-designed controlled cooling regime in the rod mill, generates a dual phase microstructure. This structure provides an excellent combination of strength and ductility due to the controlled dispersion of martensite in a ferrite matrix, and offers potential benefits for many fastener applications.

Additional information

Author(s)

David Staddon and Keith Lings, Corus C&I, England.
Publication/Event/Pages

Paper presented at WAI 75th Annual Convention, Atlanta, GA USA. Published in WJI, Oct. 2006, pp. 78-81.
Year

2005

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