BSI BS S 151 Chromium-nickel-molybdenum-vanadium heat-resisting steel billets, bars, forgings and parts - (930-1130 MPa: limiting ruling section 150 mm) - (Cr 12, Ni 2.5, Mo 1.7, V 0.3) - AMD 3783: December 31, 1981; AMD 13678: October 14, 2002
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