| http://www.w3.org/ns/prov#value | - : B is 10 ppm or less, and other elements are 50 ppm or less, preferably 30 ppm or less. [0239] Nitride forming elements (Ti, Nb, Ta, V and the like) : It is effective to decrease to 50 ppm or less. [0240] O: 50 ppm or less, preferably 30 ppm or less [0241] Elements other than the essential components and the inhibited components, which can be appropriately added (singly or in a mixture) include t
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