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Pearlite spheroidizing method based on high-speed wire production line

A technology for high-speed wire rods and production lines, which can be used in temperature control, metal rolling, etc., and can solve the problems of contradicting inventive concepts and not providing pearlite spheroidization methods.

Active Publication Date: 2020-09-15
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Pearlite spheroidizing method based on high-speed wire production line
  • Pearlite spheroidizing method based on high-speed wire production line
  • Pearlite spheroidizing method based on high-speed wire production line

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Billet heating

[0037] Continuous casting slab composition C: 0.35%, Si: 0.12%, Mn: 0.76%, P: 0.011%, S: 0.008%, Cr: 0.08%, Ni: 0.05%, Cu: 0.03%, Al: 0.031%.

[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...

Embodiment 2

[0047] 1. Billet heating

[0048] Continuous casting slab composition C: 0.21%, Si: 0.05%, Mn: 0.86%, P: 0.013%, S: 0.006%, Cr: 0.13%, Ni: 0.02%, Cu: 0.04%, Al: 0.045%.

[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 steel rolling, and relates to a pearlite spheroidizing method based on a high-speed wire production line. The pearlite spheroidizing method comprises the following steps: after a continuous casting billet of 850-950 DEG C is deformed through rough intermediate rolling and pre-finishing rolling, the temperature of the billet is controlled to be 700-760 DEG C when the billet reaches the inlets of a finishing rolling unit and a reducing-sizing unit through the adjustment of the water flow rate of a water tank; the two-phase-region controlled rolling is achieved; after the rolling, the spinning temperature is controlled to be 720-780 DEG C through the adjustment of the water flow rate of the water tank; on an extended Stelmor heatpreservation line, the occurrence of ferritic transformation is continued; and through enhanced heat preservation measures, the cooling rate reaches 0.01-0.1 DEG C / s and the online spheroidizing process is achieved during the transformation of pearlite. By the adoption of the above method, the proportion of ferrite in the microstructure of an acquired hot-rolled wire rod is greatly improved; thepearlite spheroidizing rate reaches 95% or above; and the microstructure can be rated Grade 4-5 according to the JB / T5074-2007 low and medium carbon steel spheroidite ratings as well as approaches theconventional spheroidized and annealed structure.

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...

Claims

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Application Information

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IPC IPC(8): B21B1/16B21B37/74C22C38/02C22C38/04C22C38/06C22C38/42
CPCB21B1/16B21B37/74C22C38/02C22C38/04C22C38/42C22C38/06
Inventor 张盛华苏振伟周淼屠兴圹左锦中林俊万文华
Owner ZENITH STEEL GROUP CORP
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