A kind of hot-rolled wire rod for quenching and tempering-free hot-dip galvanized bolts and its production process
A hot-rolled wire rod and hot-dip galvanizing technology, applied in metal rolling, temperature control and other directions, can solve problems such as restricting the normal production of bolts, and achieve the effects of eliminating the quenching and tempering process, reducing production costs and improving production efficiency.
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Embodiment 1
[0028] Production of φ20mm hot-rolled wire rod, converter smelting molten steel, LF refining, RH refining, continuous casting into a square billet, the size is 150*150mm, the chemical composition of the billet is: C 0.30%, Si 0.40%, Mn 0.85%, P 0.025%, S0.008%, Cr 0.80%, the rest are iron and unavoidable impurity elements;
[0029] Heating the square billet to 1090°C and keeping it warm for 100 minutes, descaling the square billet with high-pressure water, the descaling high-pressure water pressure is not lower than 15MPa, after the surface is descaled, it undergoes rough rolling, intermediate rolling, finish rolling, and sizing in sequence. Among them, the temperature at the entrance of the final rolling is controlled at 760 ° C ~ 780 ° C;
[0030] Entering the Stelmore cooling line, the fan insulation cover and the fan are all closed.
[0031] For the φ20mm hot-rolled wire rod produced in Example 1, the inspection structure is basically ferrite+pearlite, and the tensile str...
Embodiment 2
[0033] Production of φ12mm hot-rolled wire rod, converter smelting molten steel, LF refining, RH refining, continuous casting into a square billet, the size is 150*150mm, the chemical composition of the billet is: C 0.40%, Si 0.15%, Mn 0.45%, P 0.011%, S0.025%, Cr 0.92%, the rest are iron and unavoidable impurity elements;
[0034] Heating the square steel billet to 1120°C and keeping it warm for 120min, descaling the surface of the square billet with high-pressure water, the water pressure is not lower than 15MPa, and going through rough rolling, intermediate rolling, finish rolling, reducing and sizing in sequence, and the final rolling temperature is controlled at 790°C ~810°C;
[0035] Entering the Stelmore cooling line, the fan insulation cover and the fan are all closed.
[0036] For the φ12mm hot-rolled wire rod produced in Example 2, the inspection structure is basically ferrite + pearlite, and the tensile strength is 660MPa-680MPa. After drawing, cold heading and que...
Embodiment 3
[0038] Production of φ16mm hot-rolled wire rod, converter smelting molten steel, LF refining, RH refining, continuous casting into a square billet, the size is 150*150mm, the chemical composition of the billet is: C 0.35%, Si 0.23%, Mn 0.56%, P 0.012%, S0.009%, Cr 1.10%, and the rest are iron and unavoidable impurity elements.
[0039]Heating the square billet to 1130°C and keeping it warm for 140 minutes; descaling the surface of the square billet with high pressure water, the pressure of the high pressure water is not lower than 15MPa, and then going through rough rolling, intermediate rolling, finish rolling, reducing and sizing in turn, after rolling, the final The rolling temperature is controlled at 800℃~820℃;
[0040] Entering the Stelmore cooling line, the fan insulation cover and the fan are all closed.
[0041] The φ16mm hot-rolled wire rod produced in Example 3 has a ferrite+pearlite inspection structure and a tensile strength of 655MPa to 685MPa. After drawing, co...
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Abstract
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