Hardened martensitic steel contains amounts of carbon, cobalt, chrome and aluminum with traces of other minerals

摘要

The steel, for mechanical or structural components, has the following composition in percentage weight (%wt) or parts per million (ppm): carbon 0.18 - 0.30%; cobalt 5 - 7%; chrome 2 - 5%; aluminum 1 - 2%; molybdenum and wolfram 1 - 4%; vanadium trace - 0.3%; niobium trace to 0.1%; boron trace - 50 ppm; nickel 10.5 - 15%; silicon trace to 0.4%; manganese trace to 0.4%; calcium trace to 500 ppm; rare earths trace to 500 ppm; titanium trace to 500 ppm; oxygen trace to 200 ppm if steel is produced by powder metallurgy or trace to 50 ppm if made from molten metal in air or vacuum; nitrogen trace to 100 ppm; sulfur trace to 50 ppm; copper trace to one per cent; phosphorous trace to 200 ppm. The remainder is of iron or inevitable impurities resulting from manufacture.