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

Method for controlling carbon and nitrogen based on RH dry-type mechanical pump

A mechanical pump, dry technology, applied in the field of metallurgy, can solve the problems of excessive composition, production problems, low carbon content of ferromanganese, etc., and achieve the effects of low cost, low process difficulty and convenient production process.

Active Publication Date: 2019-01-11
TANGSHAN IRON & STEEL GROUP +1
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is an authorized announcement number of CN103320577 A "A Method for Controlling Carbon and Nitrogen in Automobile Panels Produced by Vacuum Circulation Degassing Furnace". This patent uses low-carbon ferromanganese to increase manganese and metal ferromanganese to increase carbon. The carbon content is extremely low, and the expected effect cannot be achie

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
  • Method for controlling carbon and nitrogen based on RH dry-type mechanical pump
  • Method for controlling carbon and nitrogen based on RH dry-type mechanical pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, a method for controlling carbon and nitrogen by an RH dry mechanical pump adopts the following process steps:

[0025] (1) Smelt 2 furnaces of IF steel before production, with carbon content of 0.0050% and nitrogen content of 0.0050%, to reduce the probability of carbon and nitrogen increase in the process of refractory materials and dipping tubes in the vacuum tank;

[0026] (2) Use carbon-free ladle for production, reduce carbon increase in the process, and do not need to connect to the bottom blowing of the ladle before the RH enters the station; before the molten steel enters the station, the RH starts the pre-vacuum mode, and pre-pumps for 3 minutes to reach the minimum vacuum of 0.67mbar;

[0027] (3) After entering the station, switch to the deep vacuum mode, and the flow rate of argon gas circulating in the dipping tube is 60Nm 3 / h, according to the P content of the converter bag sample, add 1.1kg / t steel of ferrophosphorus, start vacuuming ...

Embodiment 2

[0032] In this embodiment, a RH dry mechanical pump control method for carbon and nitrogen control adopts the following process steps:

[0033] (1) Smelt 2 furnaces of IF steel before production, with carbon content of 0.0040% and nitrogen content of 0.0040%, to reduce the probability of carbon and nitrogen increase in the process of refractory materials and dipping tubes in the vacuum tank;

[0034] (2) Use carbon-free ladle for production, reduce carbon increase in the process, and do not need to connect to the bottom blowing of the ladle before RH enters the station;

[0035] Before the molten steel enters the station, RH starts the pre-vacuumization mode, and pre-pumps for 3 minutes to reach the minimum vacuum degree of 0.65mbar;

[0036] (3) After entering the station, switch to the deep vacuum mode, and the flow rate of argon gas circulating in the dipping tube is 60Nm 3 / h, add ferrophosphorus 0.95 kg / t steel according to the P content of the converter bag sample, and ...

Embodiment 3

[0041] In this embodiment, a RH dry mechanical pump control method for carbon and nitrogen control adopts the following process steps:

[0042] (1) Smelt 2 furnaces of IF steel before production, with carbon content of 0.0030% and nitrogen content of 0.0030%, to reduce the probability of carbon and nitrogen increase in the process of refractory materials and dipping tubes in the vacuum tank;

[0043] (2) Use carbon-free ladle for production, reduce carbon increase in the process, and do not need to connect to the bottom blowing of the ladle before RH enters the station;

[0044] Before the molten steel enters the station, RH starts the pre-vacuumization mode, and pre-pumps for 3 minutes to reach the minimum vacuum degree of 0.60mbar;

[0045] (3) After entering the station, switch to the deep vacuum mode, and the flow rate of argon gas circulating in the dipping tube is 60Nm3 / h, according to the P content of the converter bag sample, add 1.3kg / t steel of ferrophosphorus, star...

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 discloses a method for controlling carbon and nitrogen based on an RH dry-type mechanical pump. The method comprises the following steps: utilizing carbon-free steel ladles for production, and preevacuating until the vacuum degree is less than or equal to 0.67 mbar before molten steel is fed into a station; after the molten steel is fed into the station, and switching into a deep vacuum degree mode, wherein the circulating argon gas flow of a soaking tube is 60-90 Nm<3>/h, the vacuum degree is less than or equal to 2.0mbar, and the deep vacuum time is 12-20min; regulating the carbon content of molten steel by use of mid-carbon ferromanganese through an alloy feeding opening after final deoxidation is finished; then regulating into a pure degassing mode, wherein the vacuum degree is less than or equal to 1.5mbar, the pure degassing time is 6-10min, the circulating argon gas flow is 40-60 Nm<3>/h, and the nitrogen content of RH out-station molten steel is stably controlledto be less than or equal to 0.0022%. The dry-type mechanical pump is capable of stably controlling the vacuum degree of the smelting process, and the method has the characteristics of low cost, low process difficulty, convenience in implementation of production process, and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling carbon and nitrogen by an RH dry mechanical pump. Background technique [0002] As the mainstream equipment for the production of ultra-low carbon steel, RH has great advantages in controlling carbon and nitrogen. Dry mechanical pumps are being gradually promoted in RH vacuum equipment. Degassing ability. Bake-hardening steel has precise requirements on the free carbon atoms in the steel. Factors such as vacuum degree, gas exchange rate, decarburization time, and degassing time during actual production have a great influence on the control of carbon and nitrogen elements in the steel. There is an authorized announcement number of CN103320577 A "A Method for Controlling Carbon and Nitrogen in Automobile Panels Produced by Vacuum Circulation Degassing Furnace". This patent uses low-carbon ferromanganese to increase manganese and metal ferrom...

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
IPC IPC(8): C21C7/10
CPCC21C7/10
Inventor 李波张洪波李梦英马德刚李阳武冠华王建兴张华程入川
Owner TANGSHAN IRON & STEEL GROUP