Explanatory notes
… sub‑Chapter covers : (1) The primary materials of iron and steel metallurgy (pig iron, spiegeleisen, ferro‑alloys, … is defined by Note 1 (a) to this Chapter. However, chromium steels containing more than 2 % of carbon are by application … blocks, lumps, whether or not broken, or in the molten state, but the heading does not extend to shaped or worked …