| 摘要 |
PURPOSE: A method of manufacturing molten metal with a ferrite structure is provided to have high strength of 65kgf/mm¬2 as well as to meet the demand of molten metal. CONSTITUTION: An alloy steel consists of, by weight %: 0.05-0.2% of C, 0-0.5% of Si, 0.9-1.8% of Mn, 0.08-0.12% of Ti, 0.03-0.08% of V, 0.005-0.01% of N, Fe and incidental impurities. The alloy steel is casts to a steel ingot, and then the steel ingot is heated at a temperature of 1100-1300°C. The steel ingot is rolled at a rolling rate of not less than 50% at an austenitic recrystallization temperature of 850-1000°C. Ferrite is formed by rolling the steel sheet at a rolling rate of not less than 50% at a temperature of 700-850°C and annealing the steel sheet. The steel sheet is rolled at a rolling rate of not less than 50% again to recrystallize the ferrite, and finally cooled down to the normal temperature of 1-10°C.
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