| http://www.w3.org/ns/prov#value | - kgf/mm.sup.2 orgreater, as compared with comparison steels which fail to meet the conditions specified by the present invention in at least one of the factors such as the area ratio of non-metallic inclusions, C content, Ni content, Mo content, V content, Nb content,Al content and N content.TABLE 4 __________________________________________________________________________ Sample Steel Chemical co
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