| 摘要 |
A machinery steel intended for rugged operating conditions, such as continuous casting rolls, and have near isotropic properties due to the controlled use of calcium, aluminum and melting techniques, and having the following constituents and characteristics: -C from about .15 to about .25 -Mn from about .75 to about 1.25 -Si from about .15 to about .50 -Ni from about 1.00 to about 1.50 -Cr from about 1.00 to about 1.50 -Mo from about .35 to about .45 -V from about .04 to about .06 -Al from about .010 to about .035 -Cu up to .35 max. -P up to .025 max. -S up to .025 max. -H2 up to 2.5 ppm max. -O2 up to 40 ppm max. -Ca from about 15 ppm to about 50 ppm, -Fe balance, plus usual non-deleterious - impurities, - said steel being further characterized by the presence of Type III sulfides being predominate over Type II sulfides.
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