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A method for producing high-strength bridge cable steel wire rod

A steel wire rod, high-strength technology, applied in the direction of temperature control, roll speed control, etc., can solve the problem of reducing the level and high level of martensite structure, and achieve the effect of reducing martensite structure

Inactive Publication Date: 2017-01-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a method for producing high-strength bridge cable steel wire rod, which is used to solve the technical problem of the high-strength bridge cable steel wire rod in the prior art with a high level of martensite structure and reduce the level of martensite structure

Method used

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  • A method for producing high-strength bridge cable steel wire rod

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Embodiment

[0023] Please refer to figure 1 , the embodiment of the present application provides a method of producing high-strength bridge cable steel wire rod, the method comprising:

[0024] S101: During continuous casting, the liquidus line of the tundish temperature is controlled at 10-20°C, the casting speed is controlled at 0.3-0.5m / min, and continuous casting obtains a bloom of 280*320mm-380*420mm;

[0025] S102: Turn the bloom into a 150*150mm-200*200mm billet with the second fire, wherein, during the process of the second fire, the temperature in the first heating section is 1017-1039°C, and the temperature in the second heating section is 1209~1218℃, the soaking section temperature is 1285~1310℃, the air consumption coefficient is 1.2~1.4; the billet stays in the furnace for 250~320min; the furnace pressure is greater than zero, and the furnace atmosphere maintains a weak reducing atmosphere; the rolling start temperature is 1192~1212°C, air-cool the billet to room temperature...

example 1

[0029] 1. Conventional smelting, control the temperature of the upper continuous casting platform. During continuous casting, the liquidus line of the tundish temperature is controlled to 10°C, the casting speed is controlled to 0.5m / min, and the liquid core is pressed down and the electromagnetic stirring technology is used for continuous casting. into a 380*420mm bloom.

[0030] 2. The process of billeting into 200*200mm billets by the second fire: the heating process is that the temperature of the first heating section is 1017°C, the temperature of the second heating section is 1213°C, the temperature of the soaking section is 1285°C, and the air consumption coefficient is 1.2; The billet stays in the furnace for 315 minutes; the furnace pressure is maintained at a slightly positive pressure, the specific furnace pressure can be 26-28Pa, and the atmosphere in the furnace is maintained at a weakly reducing atmosphere; the rolling start temperature is 1192°C; after the rolling...

example 2

[0034] 1. Conventional smelting, control the temperature of the upper continuous casting platform. During continuous casting, the liquidus line of the tundish temperature is controlled at 15°C, and the casting speed is controlled at 0.5m / min. 280*320mm bloom.

[0035] 2. The process of making billets into 150*150mm square billets with the second fire: the heating process is the temperature of the first heating section: 1025°C, the temperature of the second heating section: 1218°C, the temperature of the soaking section: 1296°C, and the air consumption coefficient: 1.3; the billet is in the furnace The time is 307 minutes; the furnace pressure is maintained at slightly positive pressure, and the atmosphere in the furnace is maintained at a weakly reducing atmosphere; the rolling start temperature is 1199°C; after the rolling is completed, the billet is air-cooled to room temperature.

[0036] 3. High wire Φ11mm rolling process: heating temperature 1167°C, soaking section temper...

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Abstract

The invention discloses a method for producing a high-strength bridge cable steel wire rod. The method comprises the following steps: during continuous casting, controlling a liquid phase line of a tundish temperature to 10-20 DEG C, controlling pulling speed to 0.3-0.5m / min, and carrying out continuous casting so as to obtain 280*320mm-380*420mm big square billets; carrying out secondary forging and blooming on the big square billets to form 150-150mm-200*200mm small square billets; rolling the small square billets into a high line with a diameter of 11-14mm, wherein in a process of carrying out secondary forging and blooming, a heating zone temperature, a soaking zone temperature, an air consumption coefficient, steel billet in-furnace time, furnace pressure, in-furnace atmosphere, a rolling temperature and a cooling way are controlled; and in a high line rolling process, a heating zone, a soaking zone, a casting billet up-down section temperature difference, in-furnace time, the rolling temperature, an inlet temperature of a finishing mill and the like are controlled. According to the technical scheme adopted by the invention, the control on a continuous casting process and control on a heating process and a cooling process for carrying out secondary forging and blooming as well as rolling on the high line are combined, so that the technical problem that a martensitic structure of the high-strength bridge cable steel wire rod in the prior art is relatively high in grade is solved, and the grade of the martensitic structure is reduced.

Description

technical field [0001] The invention relates to the technical field of hypereutectoid steel production, in particular to a method for producing high-strength bridge cable steel wire rods. Background technique [0002] With the development of cable-supported bridges such as cable-stayed bridges and suspension bridges, which are the preferred bridge types for long-span bridges, higher performance requirements are put forward for the key raw material for bridge cables-galvanized steel wires. Research on a new generation of ultra-high-strength bridge cables The use of galvanized steel wire to save material consumption, reduce production costs, and meet the needs of super-long-span bridge construction has become one of the focuses of people's attention. [0003] As an important performance index of bridge steel, the level of martensite structure is extremely important to the use of bridge steel users and even the safety of bridges. The level of martensite will affect the tensile ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/74B21B37/46
Inventor 徐志东蒋跃东任安超徐志李媛吴杰朱启铭龙莉
Owner 武汉钢铁有限公司
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