A method for controlling the cooling path of high-strength steel bars

A control method and cooling path technology, applied in the direction of heat treatment process control, manufacturing tools, heat treatment equipment, etc., to achieve the effect of reducing alloy content, improving mechanical properties, and prolonging solid solution state

Active Publication Date: 2021-03-09
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
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Problems solved by technology

[0005] Other domestic patents do not have a detailed description of the combined cooling methods for high-strength steel bars with different cooling rates and cooling paths

Method used

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  • A method for controlling the cooling path of high-strength steel bars
  • A method for controlling the cooling path of high-strength steel bars
  • A method for controlling the cooling path of high-strength steel bars

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Embodiment Construction

[0023] Taking HRB400E as an example, the production High-strength steel bars, by weight percentage, include the following components:

[0024] Ingredient Control:

[0025]

[0026] The rest is Fe, control impurity content: P≤0.045%, S≤0.045%. Billet section specification: 160×160mm 2 , Rolling speed: 12m / s, rolling start temperature: around 1040°C.

[0027] The cooling path after rolling adopts the alternate arrangement mode of large cooling speed water cooling and small cooling speed water mist cooling unit. The length of the large cooling cooling unit is 4m, and the length of small cooling speed water mist cooling unit is 5m. Large cooling speed - small cooling speed - large cooling speed - small cooling speed layout, a total of 27m, the cooling speed of the large cooling speed is about 22 ℃ / s, the cooling speed of the small cooling speed is about 12 ℃ / s, the total cooling time is about In 2.5s, the target temperature of the upper cooling bed is controlled at abo...

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Abstract

The invention provides a control method of a high-strength steel bar cooling path, and belongs to the technical field of hot-rolled steel bar cooling processes. The specification of a cold steel billet is 150*150 mm<2>-180*180 mm<2>, the temperature of heating furnace gas needs to be controlled at 1,080 DEG C-1,140 DEG C, the heat insulating time is 80 min-100 min, and the rolling starting temperature is controlled at 1,050 DEG C-1,080 DEG C. Multiple groups of cooling units in which the large cooling degree and the low cooling speed cooperate are used for cooling, water cooling is used as thecooling units of high-cooling-speed cooling, the length of each group of high-cooling-speed cooling units is 3 m-5 m, the pressure is 0.4 MPa-1.5 MPa, water mist is used as the cooling units of low-cooling-speed cooling, the length of each group of low-cooling-speed cooling units is 4 m-8 m, and the pressure is 0.5 MPa-1.0 MPa. The control method has the beneficial effects that crystal grains areoverall refined, the utilization efficiency of micro-alloys is improved, the interlamellar spacing of a perlite structure is improved, and on the premise of meeting the requirements of the new national standard GB / T1499.2-2018, the alloy content is reduced, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled steel bar cooling technology, and in particular provides a method for controlling the cooling path of high-strength steel bars. Background technique [0002] For a long time, the output of rods and wires in my country has been between 40% and 50% of the total output of steel products. In 2018, my country's steel output reached 1.1 billion tons, of which the output of steel bars reached 200 million tons, accounting for about 18.9%. Since GB / T 1499.2-2018 "Steel for Reinforced Concrete Part 2: Hot-rolled Ribbed Steel Bars" was officially implemented on November 1, 2018, the new standard has put forward higher requirements for the composition-structure-performance of hot-rolled steel bars , the main difficulty is that the closed ring tempered martensite structure is not allowed to appear on the base circle of the steel bar after hot rolling. Hardness difference ≤ 40HV. [0003] The traditional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D11/00C21D8/08
CPCC21D8/065C21D8/08C21D11/00C21D11/005
Inventor 白宇冯光宏王卫卫肖金福刘鑫张宏亮
Owner CENT IRON & STEEL RES INST
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