| 摘要 |
The steel of the present invention satisfies the following requirement for non-metallic inclusion area: when the steel is melted by an electron beam under the conditions of an irradiation rate of 200 to 600 J/sec., an irradeation time of 10 to 25 seconds, and an irradeation energy of 5000 J or more, the area of non-metallic inclusions existing in the surface of the sample after solidification falls within 15,000 mum2 or less. The steel exhibits excellent cold workability and fatigue properties.
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