Effect of Al Addition on Mechanical Properties of 17%Cr Stainless Steel

Abstract

17%Cr stainless steel containing Al has better deep drawability than SUS430 does, The followings have been found in this investigation.
(1) The mechanical properties and formability of 17%Cr stainless steel are effectively improved by the addition of Al more than 6 times N content and less than 0.1% in weight.
(2) The increase of Al/N ratio improves the r value in cold rolled and annealed steel sheet.
(3) Results of texture examination show that the increase of Al/N ratio does not change the cold rolled texture but intensifies {111} and {112} and surpresses {110} and slighdy {001} components in recrystallized texture.
(4) The poor bending workability after cold rolling due to Al addition originates mainly in the precipitated AlN. To improve the bendability, the following conditions are especially required (%Al as AlN) +0.3× (%C) <0.04 and N≤0.01%.
On the basis of these results, the 17%Cr stainless steel containing Al which has superior deep drawability and good bending workability after cold rolling has been successfully manufactured.