High Al austenitic heat-resistant steel superior in hot workability
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United States of America Patent
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Jul 14, 1992
Grant Date -
N/A
app pub date -
Aug 22, 1990
filing date -
Apr 24, 1987
priority date (Note) -
Expired
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Abstract
High Al austenitic steels are particularly susceptible to deterioration of the hot workability and suffer from severe cracking during hot working, with working becoming impossible in some cases. The present invention remarkably improves the hot workability by strictly limiting the impurities in the steel, in particular the S, O, Mg, Pb, Bi, etc. That is, the present invention reduces the S and O by adding one or more of Ca, Y, and REM to satisfy the range of -50<(S)+(O)-0.8.times.(Ca)-0.2.times.(Y)-0.1 .times.(REM)<30 (unit: ppm) and further limits the Mg to no more than 100 ppm, the Pb to no more than 10 ppm, and the Bi to no more than 5 ppm. According to the present invention, it is possible to obtain a high Al austenitic heat-resistant steel superior in hot workability which is free from occurrence of edge cracks, surface flaws, and other surface defects during hot rolling, hot casting, etc.
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