Hardening the surface of austenitic steels by strain hardening
The carrying capacity in terms of permissible stress (σ0, 2) of steels Kh18N10T and Kh21N5AG7 under conditions of uniaxial static tension increases 50% down to −253° as the result of surface hardening.
For hardened steels Kh18N10T and Kh21N5AG7 σ b n /σn > 1 and σ b n /σ0.2 > 1 with Kt=3.0 in the range of 20 to −253° C.
With static loading and bulk stress conditions (notch root radius 0.25 mm) steel Kh18N10T can be used down to −253° C and steel Kh21N5AG7 down to −196° C in the hardened condition.
Under dynamic bending conditions steels Kh18N10T and Kh21N5AG7 can be used in the hardened condition down to −253° C in the presence of a stress concentrator (Kt=3.4).
KeywordsStress Condition Static Loading Strain Hardening Austenitic Steel Stress Concentrator
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