This invention relates to manganese steels, in particular the invention relates to high strength iron-manganese based maraging-type steel combining high strength and toughness. Specifically, a manganese steel in accordance with the invention contains, apart from impurities, 11.8-13.5% by weight manganese, 2.0-6.0% by weight molybdenum, 0.002-0.2% by weight carbon, and optionally one or more of silicon (up to 0.4% by weight), sulphur (up to 0.02% by weight), and phosphorus (up to 0.03% by weight), and balance iron.
A martensite steel, especially for plastic molds, of the following compositions: 0.001 to 0.1% carbon 0.50 to 2.0% silicon 8.0 to 14.0% manganese 0.3 to 5.0% titanium 0.001 to 1.0% aluminum 0 to 2.0% chromium 0 to 3.0% molybdenum 0 to 4.0% nickel 0 to 4.0% tungsten 0 to 5.0% cobalt remainder iron, including impurities caused by manufacture.
