PROCEDIMIENTO PARA FABRICAR HERRAMIENTAS PARA LA CONFORMACION EN CALIENTE DE METALES Y ALEACIONES, POR EJEMPLO ALEACIONES DE ALUMINIO Y DE COBRE

摘要

1. Steel, in particular for tools for hot-working of metals and alloys, e.g. aluminium alloys and copper alloys, which is composed of the following in the stated percentage by weight : carbon 0.35 to 0.45 molybdenum + tungsten 2.5 to 2.7 manganese 1.7 to 1.8 silicon 0.55 to 0.7 vanadium 0.8 to 0.95 chromium 2.4 to 2.7 niobium 0.2 to 0.3 boron 0.002 to 0.009 aluminium 0.0 to 0.2 iron residue, and impurities caused by manufacture.