Noun
a steel with a relatively large component (10-14%) of manganese; highly resistant to wear and shock
Source: WordNetHadfield steel (after Sir Robert Hadfield ) or manganese steel contains 12–14% manganese which when abraded strain hardens to form an incredibly hard skin which resists wearing. Source: Internet
Mossbay Steelworks in Workington, when opened in 1877, were the world's first large-scale steelworks; its austenitic manganese steel ( mangalloy ) was produced from 1877 until 1974, with Britain's railways converting from iron to steel by the 1880s. Source: Internet
Some British tanks were protected by 75 mm (3 in) manganese steel plating, but this proved to be ineffective. Source: Internet