the steels shall contain at least one of the following elements: Al total≥0.02%, Nb:0.015 to0.06%, V:0.02 to 0.12%, Ti:0.02 to 0.10%. If these elements are used in combination, at least one of them shall be present with the minimum of content indicatedc, The steels may show a Ni content of max.0.65%
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