Abstract
The effect of Ni,Cu and N content on the properties of 17Cr-4Ni-4Cu type stainless steels were studied from a point of view giving the wrought steels a better combination of strength and corrosion resistance by the co-operation of cold-rolling and age-hardening. The following results were obtained. (1) The Ms temperature is lowered and the retained austenite is increased with increasing content of Ni, Cu or N in the steels. (2) Age-hardening in the tempering of the steels is larger as the Ni content is decreased or the Cu content is increased. Cold-rolling promotes the age-hardening and gives higher hardness. (3) Especially the steel containing N hardens significantly by the rolling and the aging treatment, which probably owes to the superimposition of the large work-hardening intensified by both the formation of martensite containing N and the hardening caused by the precipitation of Cu-rich phase and nitride from the martensite. (4) Increase of Cu- and Ni-content in the steels modifies considerably the resistance of the steels to boiling H2SO4 solution. Solution-quenching at 1000° followed by cold-rolling and tempering at below 440° does not show any deteriorating effect on the corrosion resistance, a result differing from that with 17-7 and 18-8 steels. (5) In the range of the present work the best results were obtained in the steel bearing 17Cr-4Ni-4Cu-0.17N.
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