steel, process of preparing a steel product, steel products, cold rolled steel plate or strip, turbine shaft or hot-transformed drive part and drive belt

摘要

steel having the following composition by weight: 10.0% = ni = 24.5%; 1.0% = mo = 12.0%; 1.0% = co = 18.0%; 14.0% = mo + co + si + mn + cu + w + v + nb + zr + y + ta + cr + c + al + b + ti + n = 29.0%; 21.5% = ni + co + mo = 40.0%; dashes = al = 4.0%; dashes = ti = 0.1%; dashes = n = 0.010%; dashes = si = 4.0%; dashes = mn = 13.0%; dashes = c = 0.03%; dashes = s = 0.0020%; dashes = p = 0.005%; dashes = b = 0.01%; dashes = h = 0.0005%; dashes = o = 0.03%; dashes = cr = 5.0%; dashes = cu = 4.0%; dashes = w = 6.0%; dashes = zr = 4.0%; dashes = ca = 0.1%; dashes = mg = 0.8%; dashes = nb = 4.0%; dashes = v = 4.0%; dashes = ta = 4.0%; dashes = y = 4.0%; the remainder being iron and manufacturing impurities, where the population of inclusions, observed by image analysis on a polished surface of 650 mm² if the steel is in the form of a hot-formed part or hot-rolled plate, and 800 mm² if the steel is in the form of a cold-rolled plate, it does not include non-metallic inclusions having an equivalent diameter of more than 10 µm. product made of this steel such as a sheet or strip, and its manufacturing process.