A pearlite spheroidization method based on high-speed wire rod production line
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A high-speed wire rod and production line technology, applied in metal rolling, temperature control, etc., can solve the problems of not providing pearlite spheroidization method, contradictory invention concept, etc.
Active Publication Date: 2022-02-01
ZENITH STEEL GROUP CORP CO LTD +2
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However, it only involves the research on the mechanism of pearlite spheroidization, and does not provide a specific pearlite spheroidization method based on high-speed wire rod production line, especially in the conclusion of "Experimental research on spheroidizing annealing SWRCH35K cold heading steel". Improving adjustments such as spinning temperature is contrary to the inventive concept of the present invention
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[0038] Heat the continuous casting slab with a cross-section of 160mm×160mm in a regenerative walking heating furnace, heat the first stage at 700-800°C for 35 minutes, heat the second stage at 900-1000°C for 35 minutes, and soak at 1000-1000°C Heating at 1050°C for 50 minutes.
[0039] 2. Low temperature controlled rolling
[0040] After the billets are deformed at 850-950°C for rough-intermediate rolling and pre-finishing rolling respectively, by adjusting the water flow in the water tank, the temperature at the entrance of the billets to the finish rolling unit and the reducing and sizing unit is controlled at 700-760°C. Water, so that the final rolling temperature ≤ 780 ℃.
[0041] 3. Low temperature spinning
[0042] After final rolling, the spinning temperature of the wire rod is controlled at 720-7...
[0049] Heat the continuous casting slab with a cross-section of 160mm×160mm in a regenerative walking heating furnace, heat the first stage at 700-800°C for 35 minutes, heat the second stage at 900-1000°C for 35 minutes, and soak at 1000-1000°C Heating at 1050°C for 50 minutes.
[0050] 2. Low temperature controlled rolling
[0051] After the billet is deformed at 850-950°C for rough, intermediate rolling and pre-finishing rolling, by adjusting the water flow in the water tank, the temperature at the entrance of the billet to the finish rolling unit and the reducing and sizing unit is controlled at 700-760°C. , so that the final rolling temperature ≤ 780 ℃.
[0052] 3. Low temperature spinning
[0053] After final rolling, the spinning temperature of the wire rod is controlled at 720-780°C by adjusting th...
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Abstract
The invention belongs to the technical field of high-speed wire rod rolling, and relates to a pearlite spheroidization method based on a high-speed wire rod production line. After the continuous casting billet at 850-950°C is deformed by rough, intermediate rolling and pre-finishing rolling, the water flow rate of the water tank is adjusted to control the temperature at the entrance of the billet to the finishing rolling unit and the reducing and sizing unit at 700-760°C, realizing two-phase zone control After rolling, by adjusting the flow rate of the water tank, the spinning temperature is controlled at 720-780°C; on the extended Stelmo insulation line, ferrite transformation continues to occur; through enhanced insulation measures, the cooling rate reaches 0.01- 0.1°C / s, realizing pearlite transformation and online spheroidization at the same time. The present invention adopts the above method, the ferrite ratio in the obtained hot-rolled wire rod microstructure is greatly improved, and the pearlite spheroidization rate reaches more than 95%. Grade 5, close to the structure after conventional spheroidizing annealing.
Description
technical field [0001] The invention belongs to the technical field of high-speed wire rolling, and relates to an online spheroidizing method for pearlite in the microstructure of cold heading steel hot-rolled wire rods, specifically a production process based on high-speed wire production lines through controlled rolling and controlled cooling. , to realize the spheroidization method of pearlite in the microstructure of cold heading steel hot rolled wire rod on the extended Stelmo insulation line. Background technique [0002] The high-speed wire rod production line is characterized by high speed, single wire, no torsion, micro tension, combined structure, tungsten carbide roll ring and high automation, which can realize controlled rolling and controlled cooling. The quality is good, and the biggest advantage is that the microstructure and mechanical properties of the hot-rolled wire rod are controllable. [0003] The highest rolling speed of the fifth-generation Morgan fi...
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