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High-speed wire rod air cooling roller way slow cooling process control method

A technology of process control and high-speed wire rod, applied in the direction of temperature control, etc., can solve the problems of stack thickness and cooling rate change, abnormal steel structure, non-conformity of mechanical properties characteristic values, etc., to reduce performance differences, reduce manganese content, guarantee The effect of cooling uniformity

Inactive Publication Date: 2021-09-07
XINXING DUCTILE IRON PIPES XINJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above technical problems, the purpose of the present invention is to provide a method for controlling the slow cooling process of the high-speed wire air-cooled roller table, through the optimization and adjustment of the process conditions such as the speed of the Stelmo air-cooled roller table, the number of fans turned on, and the speed of the fan , which can effectively solve the problem that the thickness and cooling rate of the steel in the air-cooled roller table change in the existing process, resulting in abnormal steel structure and mechanical property characteristic values ​​that do not meet the requirements of national standards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The control method of the φ6 air-cooled roller table slow cooling process of the hot-rolled light round steel bar HPB300. The process includes heating in the heating furnace, rolling in the finishing mill, spinning and controlled cooling by the Stelmo air-cooled roller table. The chemical composition of the billet is controlled It is required to be C: 0.06%, Si: 0.10%, Mn: 0.44%, P≤0.035%, S≤0.035%, Cr<0.045% in terms of mass percentage, and the rest is iron and unavoidable impurities.

[0024] Slow cooling process control method comprises the steps:

[0025] (1) The rolling temperature of the finishing mill is 1000°C;

[0026] (2) Control the rolling process temperature through the pre-piercing water tank, the water tank after water piercing and the water tank after the finished product to ensure that the spinning temperature is not higher than 1000°C;

[0027] (3) By controlling the speed of the air-cooled roller table, the number of fans turned on and the speed of t...

Embodiment 2

[0029] The control method of the φ10 air-cooled roller table slow cooling process of the hot-rolled light round steel bar HPB300. The process includes heating in the heating furnace, rolling in the finishing mill, spinning and controlled cooling by the Stelmo air-cooled roller table. The chemical composition of the billet is controlled It is required to be C: 0.07%, Si: 0.11%, Mn: 0.48%, P≤0.035%, S≤0.035%, Cr<0.045% in terms of mass percentage, and the rest is iron and unavoidable impurities.

[0030] Slow cooling process control method comprises the steps:

[0031] (1) The rolling temperature of the finishing mill is 1000°C;

[0032] (2) Control the rolling process temperature through the pre-piercing water tank, the water tank after water piercing and the water tank after the finished product to ensure that the spinning temperature is not higher than 960°C;

[0033] (3) By controlling the speed of the air-cooled roller table, the number of fans turned on and the speed of t...

Embodiment 3

[0035] The air-cooled roller table slow cooling process control method of φ8 specification for hot-rolled ribbed steel bar HRB400E, the process includes heating in the heating furnace, finishing mill rolling, silk spinning and Stelmo air-cooled roller table controlled cooling, and the chemical composition of the billet is controlled It is required to be C: 0.24%, Si: 0.36%, Mn: 1.41%, P≤0.040%, S≤0.040%, Cr<0.045% in terms of mass percentage, and the rest is iron and unavoidable impurities.

[0036] Slow cooling process control method comprises the steps:

[0037] (1) The rolling temperature of the finishing mill is 1000°C;

[0038] (2) Control the rolling process temperature through the pre-piercing water tank, the water tank after water piercing and the water tank after the finished product to ensure that the spinning temperature is not higher than 980°C;

[0039] (3) By controlling the speed of the air-cooled roller table, the number of fans turned on and the speed of the ...

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Abstract

The invention discloses a high-speed wire rod air cooling roller way slow cooling process control method. The process comprises heating furnace heating, finishing mill rolling, spinning and Stelmor air cooling roller way controlled cooling. The slow cooling process control method comprises the following steps: (1) the rolling temperature of a finishing mill is 1000 DEG C; (2) the spinning temperature ranges from 940 DEG C to 1000 DEG C; and (3) by controlling the speed of an air cooling roller way, the number of started draught fans and the speed of the draught fans, the slow cooling time of steel materials on the air cooling roller way within the interval of 727 to 500 DEG C is prolonged, and after pearlite transformation is promoted, secondary cooling is conducted till the coil collecting temperature is reached. According to the slow cooling process control method provided by the invention, the problem that the mechanical property characteristic values of HPB300 and HRB400E products cannot meet the national standard after the productivity of high-speed wire rods is improved can be effectively solved, the qualified product quality and normal accelerated production can be ensured, and the improvement of enterprise productivity is promoted.

Description

technical field [0001] The invention relates to a high-speed wire rod cooling process control method, in particular to a high-speed wire rod air-cooled roller table slow cooling process control method. Background technique [0002] The production of high-speed wire rod has the characteristics of controlled rolling and controlled cooling. Among them, controlled rolling refers to the use of enhanced reduction and controlled cooling process to improve the strength and toughness of hot-rolled steel under the condition of lower temperature than conventional rolling. A rolling method with comprehensive properties, controlling the process of austenite recrystallization after rolling plays a decisive role in obtaining fine grain structure. Controlled rolling is mainly used to refine the grain, and the comprehensive mechanical properties of the steel produced by this method, such as strength and toughness, are greatly improved. Controlled cooling refers to a method of artificially c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/76
CPCB21B37/76
Inventor 杨林
Owner XINXING DUCTILE IRON PIPES XINJIANG
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