Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Effect of Mo and W on Properties of 18Cr-12Ni Stainless Steel
Ryuichi NakagawaYasuo Otoguro
Author information
JOURNAL FREE ACCESS

1960 Volume 46 Issue 14 Pages 1758-1764

Details
Abstract

In previous reports (ib. Tetsu-to-Hagané, 45 (1959), 126; 46 (1960), 377) the authors reported the effect of Nb and Ti on properties of 18Cr-12Ni austenitic stainless steels.
This report concerned the effect of Mo and W aging behavior, microstructure, precipitates, tensile properties at various temperatures and creep-rupture strength of the same steel.
The following results were obtained. :
1) The steel was hardened during aging by precipitation of M6C.
2) The precipitates of M6C, Cr23C6, Fe2Mo, Fe2W and σ phase were observed.
The amounts of the precipitates of Fe2Mo, Fe2W and σ phase were increased as the aging temperature was elevated and as the C content was decreased and as the Mo, the W content was increased.
3) The precipitation occurred at first on grain boundaries and secondarily within grains, and subsequently, coagulation of precipitates on grain boundaries began.
4) Resistance to oxidation in the air at 1100°C was decreased with the Mo ahd the W contents.
5) Tensile strength was increased linearly with the Mo or the W content at each temperature.
The rate of increase of tensile strength was about 1kg/mmmm2 with a percent of Mo and from 1·5 to 2·0kg/mmmm2 with a percent of W.
6) Creep rupture strength was increased with the content. The rate of increase of this strength for the steels with the higher C content was greater than that for the steels with the lower C content because of the precipitation of M6C.

Content from these authors
© The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top