| 摘要 |
1. Method of producing castings from cast iron with spheroidal graphite with a mixed austenitic-bainitic mixed structure from a melt with the usual amounts of silicon, carbon, phosphorus, sulphur and magnesium and also additional amounts of manganese, molybdenum, possibly copper and possibly nickel, in which the casting is heated to austenitisation temperature and is also maintained, until austenitisation, at this temperature and thereafter is cooled to bainitisation temperature of 350 to 400 degrees C and is held at this temperature for a time corresponding to the required bainite fraction, wherein the melt contains less than 0.3% manganese, 0.2 to 0.8% molybdenum, possibly 0.1 to 1.5% copper and possibly up to 3% nickel and wherein the casting is brought to an austenitisation temperature of 800 to 860 degrees C, is maintained for 10 to 60 minutes at this temperature, is thereafter cooled in a time of less than 2 minutes to the bainitisation temperature and is maintained at this temperature for 5 to 60 minutes. |
