| 摘要 |
PURPOSE: A method of manufacturing a two-phase composite steel is provided to secure high strength for a tempered martensite single-phase structure under the same chemical elements through heat treatment. CONSTITUTION: A rod wire consists of 0.10-0.35wt% of carbon, 0.10-0.30wt% of silicon, 0.50-2.0wt% of manganese, 0.50-2.0wt% of chromium, 0.01-1.0wt% of molybdenum, 0.001-0.005wt% of boron, less than 0.015wt% of phosphorus, less than 0.01wt% of sulfur and the rest of iron and other impurities. The rod wire is cold-rolled and austenitized at a temperature of 930-970°C for 15-30 minutes. After that, the rod wire is quenched, kept regular to secure 10-40% of lower bainite fraction and tempered.
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