| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.14 ( March 1986 ) Special Issue on Stainless Steels ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Hot Workability of Austenitic Stainless Steels Containing Delta-Ferrite Tatsuo Kawasaki, Isao Takada, Hiroshi Ohtsubo, Shigeharu Suzuki |
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Synopsis : Hot workability of austenitic stainless steels, which have problems of cracking when they are hot rolled, is studied. Sulfur has a great effect on hot workability and decreases ductility of steels at around 1050 during cooling from the slab reheating temperature. For steel containing little delta-ferrite, the ductility increases again as the temperature decreases. For steels containing delta-ferrite, however, ductility does not increase again. Then, the temperature range of reduced ductility for these steels expands widely towards lower temperatures. The effects of S and delta-ferrite on hot workability are discusses. Hot workability of these steels are improved remarkably by eliminating the effect of S. Problems of cracking during hot working can be solved completely by reducing S content to below about 10 ppm and/or with the addition of Ca or REM. |
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