1959 Volume 45 Issue 12 Pages 1357-1362
Heat treatment of type 321 stainless steel tubes for high-temperature service must be carried out based on the different standpoints from those for use in chemical industry.
The effects of heat treatment on its creep rupture strength of the 321 type stainless steel were studied for such a use as given in this report. The excellent creep-rupture strength was ascertained to be obtained by the complete solution-treatment of titanium carbide into austenite at a high temperature, thereby the quenching-temperature of more than 1100°C was concluded duly recommendeble for industrial heat treatment. Moreover, the specimens containing a lot of ferrite in austenite were confirmed to show the creep-rupture strength lower than those having only a single austenite phase.