Controlled rolling and controlled cooling method for reducing martensite in microstructure of high-alloy steel hot-rolled wire rod
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A hot-rolled wire rod and high-alloy steel technology, applied in the field of steel rolling, can solve the problems of brittle fracture and scrapping of the whole coil, so as to reduce the scrap rate and avoid brittle fracture.
Inactive Publication Date: 2021-01-19
ZENITH STEEL GROUP CORP +1
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On the other hand, especially for high-carbon and high-alloy steel hot-rolled wire rods, if the martensite content in the microstructure is too high, brittle fractures are likely to occur during the wire rod bundling and stacking process, resulting in the scrapping of the entire coil
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[0039] Heat the steel billet with a cross-section of 160mm×160mm in the temperature environment of 700-800°C for 40 minutes in the first section of the regenerative heating furnace, heat it in the temperature environment of 900-1000°C in the second section for 40 minutes, and heat it in the temperature environment of 1040-1100°C in the soaking section Heat in medium for 50min.
[0040] 2. Controlled rolling
[0041] After the billet comes out of the heating furnace, it undergoes rough rolling and pre-finishing deformation respectively at 900-1000°C. By adjusting the water flow of the water tank, the temperature of the billet reaching the finishing mill is controlled at 750-800°C. By turning on the cooling water between the stands, the The final rolling temperature of the finishing mill shall not exceed 820°C. ...
[0050] Heat the steel billet with a cross-section of 160mm×160mm in the temperature environment of 700-800°C for 40 minutes in the first section of the regenerative heating furnace, heat it in the temperature environment of 900-1000°C in the second section for 40 minutes, and heat it in the temperature environment of 1040-1100°C in the soaking section Heat in medium for 50min.
[0051] 2. Controlled rolling
[0052] After the billet comes out of the heating furnace, it undergoes rough rolling and pre-finishing deformation respectively at 900-1000°C. By adjusting the water flow of the water tank, the temperature of the billet reaching the finishing mill is controlled at 750-800°C. By turning on the cooling water between the stands, the The final rolling temperature of the finishing mill shal...
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Abstract
The invention belongs to the technical field of steel rolling, and particularly relates to a controlled rolling and controlled cooling method for reducing martensite in a microstructure of a high-alloy steel hot-rolled wire rod. After being heated, a steel billet is subjected to rough, medium and pre-finish rolling deformation; the water flow of a water tank is adjusted, so that the temperature ofthe steel billet reaching a finish rolling mill is controlled to be 750-800 DEG C, and low-temperature controlled rolling is achieved; the flow of the water tank is adjusted after rolling, so that the spinning temperature is controlled to be 780-820 DEG C; a Stelmor fan is started so that the temperature of a wire rod is quickly reduced, and then the wire rod immediately enters an insulation cover to continue the organizational transformation; the speed of a Stelmor roller way is set to be 3-5 m / min, so that the transformation time of a bainite structure is prolonged, and the effect that onlya very small number of martensite structures are contained in the microstructure of the high-alloy steel hot-rolled wire rod is ensured; and therefore, the strength is reduced, the plasticity is improved, and it is ensured that the high-alloy steel hot-rolled wire rod has good drawing performance. By means of the controlled rolling and controlled cooling method for reducing martensite in the microstructure of the high-alloy steel hot-rolled wire rod, the martensite content in the microstructure of the obtained high-alloy steel hot-rolled wire rod is less that 2%, and the drawing performance is extremely good.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a method for optimizing the microstructure of a high-alloy steel hot-rolled wire rod, in particular to a controlled-rolling and controlled-cooling method for reducing martensite in the microstructure of a high-alloy steel hot-rolled wire rod. Background technique [0002] High-alloy steel hot-rolled wire rod has high strength and hardness due to the addition of more alloying elements, good austenite stability, and severely delayed microstructure transformation. If the control is not good, it is easy to produce martensite, especially for high-speed wire rod production lines. The production pace is fast and cannot provide sufficient tissue transformation time, so the production is very difficult, and it is impossible to obtain a complete ferrite + pearlite structure. [0003] CN107119231A A steel wire rod for hardware tools and its production method discloses a production metho...
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