Heating control method of steel rolling heating furnace applicable to pipeline steel

A heating control and heating furnace technology, applied in the direction of heat treatment process control, heat treatment furnace, furnace, etc., can solve the problems of mechanical properties, process properties and chemical properties, rolling instability, temperature fluctuations, etc., to avoid slab black marks Defects, prevent slab cracks, and eliminate the effect of influence

Inactive Publication Date: 2016-03-23
HANGANG GRP HANBAO IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of pipeline steel mainly adopts hot rolling process at present, and the hot rolling process mainly includes three main processes of heating, rolling and cooling, among which the heating process is the most critical process control link in the production of pipeline steel; Or ultra-low carbon micro-alloyed steel, Ni, Mo, Cr, Cu, V, Ti, Al and other alloying elements are usually added to the element composition, so that the heating process control of pipeline steel is obviously different from other carbon steels, so th...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]Clean the oxide scale, cracks, and hole defects on the surface of the pipeline steel slab to eliminate the visible quality defects on the surface, and use the head alignment method to distribute the material to ensure the consistency of the head temperature; the heating system of the heating furnace is: the flue inlet temperature is 700°C , preheating section temperature 1060°C, preheating time 105min, heating stage 1 temperature 1170°C, heating time 30min, heating stage 2 temperature 1200°C, heating time 35min, soaking section temperature 1160°C, holding time 40min; manually adjust the upper part of the heating furnace burner load in the zone and the lower zone, so that the temperature in the upper zone of the soaking section is 20°C to 40°C lower than that in the lower zone; ℃, while the heating time in the preheating section is 105 minutes, the oxygen content in the heating furnace is controlled at 1% to 4%, so as to control the heating rate before the slab temperature...

Embodiment 2

[0026] Clean the oxide scale, cracks, and hole defects on the surface of the pipeline steel slab to eliminate the visible quality defects on the surface, and use the head alignment method to distribute the material to ensure the consistency of the head temperature; the heating system of the heating furnace is: the flue inlet temperature is 750°C , preheating section temperature 1100°C, preheating time 120min, heating stage 1 temperature 1200°C, heating time 50min, heating stage 2 temperature 1220°C, heating time 45min, soaking section temperature 1180°C, holding time 50min; manually adjust the upper part of the heating furnace Burner load in the zone and the lower zone, so that the temperature in the upper zone of the soaking section is 20°C to 40°C lower than the temperature in the lower zone; the furnace pressure setting range is 4pa to 10pa; when the flue inlet temperature is guaranteed to be 750°C, the temperature in the preheating section is 1100 ℃, while the heating time ...

Embodiment 3

[0029] Clean the oxide scale, cracks, and hole defects on the surface of the pipeline steel slab to eliminate the visible quality defects on the surface, and use the head alignment method to distribute the material to ensure the consistency of the head temperature; the heating system of the heating furnace is: the flue inlet temperature is 800°C , preheating section temperature 1150°C, preheating time 150min, heating section 1 temperature 1250°C, heating time 60min, heating section 2 temperature 1240°C, heating time 60min, soaking section temperature 1200°C, holding time 60min; manually adjust the upper part of the heating furnace zone and the lower zone burner load, so that the temperature in the upper zone of the soaking section is 20°C to 40°C lower than the temperature in the lower zone; ℃, while the heating time in the preheating section is 150 minutes, the oxygen content in the heating furnace is controlled at 1% to 4%, so as to control the heating rate before the slab te...

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Abstract

The invention relates to a heating control method of a steel rolling heating furnace applicable to pipeline steel. A four-stage heating mode is adopted. The temperature at the preheating stage is 1100+/-50 DEG C, and the preheating time is more than or equal to 105 min; the temperature at the first heating stage is 1200+/-30 DEG C, and the heating time is more than or equal to 30 min and less than or equal to 60 min; the temperature at the second heating stage is 1220+/-20 DEG C, and the heating time is more than or equal to 35 min and less than or equal to 60 min; the temperature at the uniform heating stage is 1180+/-20 DEG C, and the heating time is more than or equal to 40 min; the temperature of a flue inlet is 750+/-50 DEG C; the heating speed before the temperature of a plate blank is lower than or equal to 600 DEG C is controlled not to be higher than 7 DEG C/min, and the difference between the adjacent lowest temperature and the highest temperature in the length direction of the plate blank is controlled to be lower than or equal to 8 DEG C. By means of the heating control method, the continuity of the plate blank heating process is guaranteed, and plate blank cracks caused by improper heating speed are avoided; the performance stability of the whole plate is effectively guaranteed in the pipeline steel rolling process, and steel wasting production accidents and plate blank black print defects caused by squatting and bending of an intermediate billet are avoided.

Description

technical field [0001] The invention relates to a heating control method for a steel rolling heating furnace suitable for pipeline steel, and belongs to the technical field of steel rolling heating furnace process control. Background technique [0002] Pipeline steel is widely used in oil, natural gas, gas energy or coal, building material slurry transportation and other fields. Since pipeline steel is directly related to national economic development and even national energy strategy security, the market demand is very large, so major iron and steel enterprises are paying more and more attention to it. R&D and production of pipeline steel products. The production of pipeline steel mainly adopts hot rolling process at present, and the hot rolling process mainly includes three main processes of heating, rolling and cooling, among which the heating process is the most critical process control link in the production of pipeline steel; Or ultra-low carbon micro-alloyed steel, N...

Claims

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Application Information

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IPC IPC(8): C21D11/00C21D9/70
CPCC21D9/70C21D11/00
Inventor 李会朝郝玮玮冯叶龙陈笑笑袁刚周军锋李安周
Owner HANGANG GRP HANBAO IRON & STEEL
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