Method of manufacturing high-strength hot rolled ribbed steel bar
A technology of hot-rolled ribbed steel bar and ribbed steel bar, which is applied in metal rolling, temperature control, metal rolling and other directions, can solve the problems of increased consumption of vanadium-nitrogen alloy, insufficient production power, and inability to scale output, etc. The effect of reducing the amount of microalloys added, stable mechanical properties of the process, and economical society
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[0021] Example 1
[0022] A. Take the steel billet with the following chemical composition: C 0.18%, Si 0.46%, Mn 1.22%, V 0.033%, S 0.021%, P 0.027%, the rest is Fe and unavoidable impurities;
[0023] B. Send the above-mentioned steel billet into a heating furnace with a furnace temperature of 1160°C. When heated to a billet temperature of 1010°C, it is rolled by a rolling mill. During rolling, it is rough-rolled for 65 seconds at a rolling speed of 1m / s. After that, it is rolled for 60 seconds under the rolling conditions of 4m / s, and finally finished for 75 seconds under the rolling conditions of 16m / s;
[0024] C. The cooling water volume of the finished rolled steel in step B is 360m 3 / h. Under the condition of cooling water pressure of 1.4MPa, quickly cool for 3 seconds to obtain steel with a temperature of 880℃, and then place it in the air to cool to 250℃, and obtain HRB500 fine-grained high-strength steel bars with a specification of Φ12mm .
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[0025] Example 2
[0026] A. Take the steel billet with the following chemical composition: C 0.24%, Si 0.56%, Mn 1.51%, V 0.031%, S 0.016%, P 0.023%, the rest is Fe and unavoidable impurities;
[0027] B. Send the above-mentioned steel billet into a heating furnace with a furnace temperature of 1200°C. When it is heated to a slab temperature of 1050°C, it is rolled by a rolling mill. During rolling, it is rough-rolled for 60 seconds at a rolling speed of 1m / s. , Then it is rolled for 60 seconds under the rolling conditions of 4m / s, and finally finished rolling for 72 seconds under the rolling conditions of 7.8m / s;
[0028] C. Put the finished rolled steel in step B in the cooling water with a total water volume of 370m 3 / h, under the condition of cooling water pressure of 1.9MPa, rapid cooling for 2 seconds to obtain steel with temperature of 870℃, natural air cooling on the cooling bed to 270℃, collecting and bundling, and obtaining HRB500 fine grain height of Φ32mm Strength re...
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