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After-roll reinforced cooling process for 82B wire rod steel strand

A technology of forced cooling and process method, applied in the direction of metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of cooling speed reduction, drawing fracture, insufficient cooling speed, etc., to reduce the broken wire rate and reduce the transverse temperature The effect of poor and uniform mechanical properties

Active Publication Date: 2006-05-31
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] figure 1 It is a standard Stelmo controlled cooling line, and its problems are: (1) When producing wire rods with specifications of φ12.5mm and above, the cooling speed is obviously insufficient, and the temperature rises greatly during phase transition
(2) Lack of an effective fan horizontal air volume distribution device, so that the temperature of the overlapping point of the edge of the wire rod is significantly higher than the temperature in the middle, and a "red point" appears, which causes the cooling speed of this part to be greatly reduced, and proeutectoid is prone to occur Phase and coarse pearlite structure, resulting in drawing fracture
(4) The distance of the forced cooling section is short, only 27 meters

Method used

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  • After-roll reinforced cooling process for 82B wire rod steel strand
  • After-roll reinforced cooling process for 82B wire rod steel strand

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Embodiment Construction

[0017] The invention can be used in the high-carbon steel wire rod production in a high-speed wire factory.

[0018] By adopting the cooling control process of the present invention, φ12?4mm 82B wire rods meeting the requirements have been mass-produced in Shougang. The process route of Shougang’s production of 82B is as follows: 80-ton converter and F furnace refining? 30mm square continuous casting Standard Stelmore controlled cooling. The chemical composition of the wire rod is as follows: 0.77-0.81% C, 0.60-0.90% Mn, 0.15-0.35% Si, 0.30-0.43% Cr, 0.02-0.08% V. The starting rolling temperature of the wire rod is 1050-1100°C, the finishing rolling temperature is 1000-1040°C, and the spinning temperature is 810-850°C. The structure and performance of the produced wire rod are stable, the average lamellar spacing is 0.18μm, the average diameter of pearlite pellets is 8.4μm, the tensile strength of the wire rod is 1160-1220MPa, and the shrinkage rate is 30-36%, which is bet...

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Abstract

A forced cooling technology after rolling of the coiled steed rod used for making twisted steel cable features that the roller speed is increased in the temp raising segment of phase changing, the roller speed is lower in the other segments of phase changing, an auxiliary blower is additionally used at the phase changing position, and a small cover plate is used to regulate the transverse distribution of wind for uniform cooling. The resultant coiled steel rod has uniform structure, and high tensional strength (1160-1220 MPa).

Description

[0001] Field [0002] The invention belongs to the field of steel rolling and is mainly suitable for producing 82B wire rods for φ15.24mm1860-2000MPa steel strands. Background technique [0003] The final use of 82B wire rod for steel strand is to make steel strand products through drawing and deep processing. The wire should have high draw strength and good elongation properties. This requires that the wire structure is mainly composed of fine pearlite, that is, sorbite, with an average spacing of 0.1 to 0.3 μm. The amount of proeutectoid structure should be as small as possible, and there should be no network structure; in addition, there must be no martensite in the quenched structure. The lower the austenite-to-pearlite transformation temperature, the finer the lamellar spacing. [0004] The cooling rate in the phase transformation zone determines the decomposition and transformation temperature and time of austenite, and also determines the final microstructure of the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
Inventor 王全礼李永东李飞章军周德赵泊刘玉新卢兵王彦锋
Owner SHOUGANG CORPORATION
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