1984-02-01

Formable Ferrite - Degenerated Pearlite Steel (FDP-55) for Automotive Use 840012

In order to help the gauge reduction of wheels and chassis parts of automobiles, a form-able and weldable hot rolled steel of 550 MPa grade, named FDP-55, has been developed. FDP-55 is an 0.14% C, 0.1% Si, 1.1% Mn and Nb free A1-killed steel obtained by controlled-cooling to a low coiling temperature on a runout table, and it is featured by ferrite-degenerated pearlite microstructure. Results of co-operative works with automotive makers showed that FDP-55 was successful in the application to wheels and chassis parts attaining the large weight reduction. This paper reports the metallurgical features and characteristics of the steel.

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