Unlock instant, AI-driven research and patent intelligence for your innovation.

Control method for reducing generation amount of strip steel zinc crust in starting up hot-dip galvanizing aluminum and zinc machine set

A control method, hot-dip aluminum technology, applied in the field of metallurgy, can solve problems such as zinc skin problems that cannot be solved, achieve the effects of reducing product defects and equipment failure downtime, improving coating adhesion, and reducing coating peeling

Inactive Publication Date: 2014-07-09
SHANGHAI MEISHAN IRON & STEEL CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with these public technologies, the purpose to be achieved is different from this technology. At the same time, the working conditions of these public technologies are all under normal and stable production conditions of the unit, which cannot solve the large amount of zinc skin that the unit needs to face during the roll change and start-up period. question

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control method for reducing generation amount of strip steel zinc crust in starting up hot-dip galvanizing aluminum and zinc machine set
  • Control method for reducing generation amount of strip steel zinc crust in starting up hot-dip galvanizing aluminum and zinc machine set
  • Control method for reducing generation amount of strip steel zinc crust in starting up hot-dip galvanizing aluminum and zinc machine set

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The control method for reducing the amount of hot-dip galvanized galvanizing unit starting strip steel zinc skin production in this embodiment, the process is as follows figure 2 As shown, the control steps are as follows:

[0031] (1) Turn on the RHS radiant tube 16 of the radiant tube heating and soaking section (RHS) 34 30 minutes before starting up the hot-dip galvanized unit to raise the temperature of the radiant tube heating and soaking section (RHS) 34 to 750°C. When the heating and soaking section (RHS) 34 furnace temperature rises to 525 ° C, the mixer 13 is turned on, and a mixture of hydrogen and nitrogen is introduced into the cooling soaking section (CS) 35 and thermal tension roller section (TDRS) 36 HN protective gas; HN protective gas is composed of hydrogen and nitrogen, the volume ratio of hydrogen to nitrogen is 25%, and the flow rate of hydrogen is 140m 3 / h, nitrogen flow rate is 540m 3 / h , HN protective gas flow rate is 680m 3 / h; the CS elec...

Embodiment 2

[0036] The control method for reducing the amount of hot-dip galvanized galvanizing unit starting strip steel zinc skin production in this embodiment, the process is as follows figure 2 As shown, the control steps are as follows:

[0037] (1) Turn on the RHS radiant tube 16 of the radiant tube heating and soaking section (RHS) 34 35 minutes before the start-up of the hot-dip galvanizing unit, so that the temperature of the radiant tube heating and soaking section (RHS) 34 furnace rises to 780 ° C, when the radiant tube When the heating and soaking section (RHS) 34 furnace temperature rises to 525 ° C, the mixer 13 is turned on, and a mixture of hydrogen and nitrogen is introduced into the cooling soaking section (CS) 35 and thermal tension roller section (TDRS) 36 HN protective gas; HN protective gas is composed of hydrogen and nitrogen, the volume ratio of hydrogen to nitrogen is 30%, and the flow rate of hydrogen is 150m 3 / h, nitrogen flow rate is 550 m 3 / h , HN protect...

Embodiment 3

[0042] The control method for reducing the amount of hot-dip galvanized galvanizing unit starting strip steel zinc skin production in this embodiment, the process is as follows figure 2 As shown, the control steps are as follows:

[0043] (1) Turn on the RHS radiant tube 16 of the radiant tube heating and soaking section (RHS) 34 40 minutes before starting up the hot-dip galvanizing unit to raise the temperature of the radiant tube heating and soaking section (RHS) 34 to 800 °C. When the heating and soaking section (RHS) 34 furnace temperature rises to 525 ° C, the mixer 13 is turned on, and a mixture of hydrogen and nitrogen is introduced into the cooling soaking section (CS) 35 and thermal tension roller section (TDRS) 36 HN protective gas; HN protective gas is composed of hydrogen and nitrogen, the volume ratio of hydrogen to nitrogen is 35%, and the flow rate of hydrogen is 160m 3 / h, nitrogen flow rate is 560 m 3 / h , HN protective gas flow rate is 720 m 3 / h. The CS...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for controlling the amount of galvanized steel strip in the field of metallurgy, which is a control method for reducing the amount of galvanized steel strip produced by a hot-dip galvanizing unit. The radiant tube in the hot section makes the furnace temperature rise to 750-800°C. When the furnace temperature rises to 525°C, HN protective gas is passed into the cooling soaking section and the hot tension roller section; when the radiant tube is heated and soaked When the furnace temperature in the hot section reaches 750-800°C, the hot-dip galvanizing unit starts, the strip steel runs at a speed of 30-50m / min, and at the same time, the burner in the direct combustion section is opened to raise the furnace temperature to 800-850°C; When the temperature of the section furnace rises to 800-850°C, open the cooling nozzle in the soaking section to cool the strip steel, control the strip steel temperature to 550-600°C, and adjust the strip steel temperature in the direct combustion section to 630-660°C; make the strip steel The speed is gradually increased to the required value of the normal process speed. The invention ensures the temperature of the steel strip entering the zinc pot when the machine is turned on, greatly removes the oxide film on the surface of the steel strip, promotes the formation of iron-aluminum compounds, improves the adhesion of the coating, and reduces the peeling of the coating and the generation of zinc skin.

Description

technical field [0001] The invention relates to a method for controlling the amount of zinc skin on a steel strip in the field of metallurgy, in particular to a control method for reducing the amount of zinc skin on the surface of a steel strip when the cold-rolled hot-dip galvanizing unit is shut down to replace sinking rolls and restarted. Background technique [0002] At present, the production process of hot-dip galvanizing unit at home and abroad mainly adopts the "improved Sendzimir method". The production process of hot-dip galvanizing unit mainly includes: pre-plating treatment → hot-dip galvanizing → post-plating treatment. Among them, hot-dip galvanizing is the core of hot-dip galvanizing unit production, which is mainly composed of zinc pots, sinking rolls, air knives and other equipment. In the process of hot-dip steel strip production, the sinking roll is always immersed in the high-temperature aluminum-zinc solution in the zinc pot. It has no transmission mecha...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/40C23C2/06
Inventor 马天栋邱向伟陈绍林
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD