CN115491468A - Method for controlling nitrogen content through RH refining process of non-oriented silicon steel - Google Patents
Method for controlling nitrogen content through RH refining process of non-oriented silicon steel Download PDFInfo
- Publication number
- CN115491468A CN115491468A CN202211286771.2A CN202211286771A CN115491468A CN 115491468 A CN115491468 A CN 115491468A CN 202211286771 A CN202211286771 A CN 202211286771A CN 115491468 A CN115491468 A CN 115491468A
- Authority
- CN
- China
- Prior art keywords
- circulating
- steel
- oriented silicon
- molten steel
- silicon steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
Abstract
The invention belongs to the technical field of steel production, and relates to a method for controlling nitrogen content by controlling an RH refining process of non-oriented silicon steel, wherein during RH refining, argon is used as a circulating gas, and the circulating flow of the argon is increased so as to enhance the boiling phenomenon of molten steel in a vacuum tank and improve the denitrification efficiency of the molten steel; meanwhile, low-carbon ferromanganese and micro-carbon ferrosilicon are adopted during RH alloying, and alloy with high N content cannot be added. Because the flow of the circulating gas is increased, the circulating speed of the molten steel is accelerated, and the integral RH circulating time is ensured that the circulating frequency of the molten steel is more than or equal to 3 times. The method solves the problem of poor molten steel denitrification effect caused by shortened RH production cycle, and realizes that the N content of the non-oriented silicon steel finished product is controlled to be less than or equal to 0.003%.
Description
Technical Field
The invention belongs to the technical field of steel production, and relates to a method for controlling nitrogen content by a non-oriented silicon steel RH refining process.
Background
The non-oriented silicon steel is a silicon-iron alloy with low carbon content, and crystal grains of the deformed and annealed steel plate are distributed in a random orientation mode. The contents of silicon, aluminum and manganese in the steel are controlled in a certain range according to regulations, and the contents of carbon, sulfur, nitrogen and oxygen are required to be as low as possible.
In the steel smelting process, the ferrite has low capability of dissolving nitrogen. When supersaturated nitrogen is dissolved in steel, after the steel is placed for a long period of time or heated at 200-300 ℃ subsequently, nitrogen is precipitated in the form of nitride, the hardness and the strength of the steel are improved, and the plasticity is reduced. Thus, nitrogen is a harmful element to most steel grades.
With the increasing requirements of the market on the quality of steel products, the requirements of the production process on the nitrogen content in finished steel are gradually increased, the nitrogen content of a plurality of steel grades is required to be below 0.005%, and the N content of the finished steel is required to be less than or equal to 0.003% for non-oriented silicon steel and other steel grades.
At present, the N content of non-oriented silicon steel is controlled by RH vacuum treatment which is a common means in the industry, and the RH circulation flow is controlled to be between 90 and 120Nm 3 However, with the increasing production rhythm, the RH treatment time is shortened, and the aim of nitrogen content less than or equal to 0.003 percent is difficult to realize under the conventional production condition.
Disclosure of Invention
In view of the above, the present invention aims to solve the problem of low nitrogen content production of non-oriented silicon steel, and provides a method for controlling nitrogen content in non-oriented silicon steel through RH refining process.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for controlling nitrogen content by RH refining process of non-oriented silicon steel adopts argon as circulating gas during RH refining, and improves the circulating flow of argon so as to enhance the boiling phenomenon of molten steel in a vacuum tank and improve the denitrification efficiency of the molten steel; meanwhile, alloy with high N content cannot be added during RH alloying.
Furthermore, as the flow of the circulating gas is increased, the circulating speed of the molten steel is accelerated, and the integral RH circulating time is ensured that the circulating frequency of the molten steel is more than or equal to 3 times.
Further, the argon gas circulation flow is adjusted to 150-180 Nm 3 /h。
Furthermore, the N content of the non-oriented silicon steel finished product is less than or equal to 0.003 percent.
The invention has the beneficial effects that: according to the invention, by improving the argon gas circulation flow, the molten steel boiling phenomenon in the vacuum tank is enhanced, the molten steel denitrification efficiency is improved, the whole circulation time is controlled, the addition of nitrogen during alloying is limited, and the content of nitrogen in steel can be ensured to be less than or equal to 0.003 percent while the RH short-period production is met; meanwhile, the total class of the added alloy is reduced, the control of inclusions in molten steel is improved, and the purity of the molten steel is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
A method for controlling nitrogen content in non-oriented silicon steel by RH refining process adopts argon as circulating gas in the RH refining process, and improves the circulating flow of argon, wherein the circulating flow of argon is controlled to be 150-180 Nm 3 H, enhancing the boiling phenomenon of molten steel in the vacuum tank and improving the denitrification efficiency of the molten steel; simultaneously adopts low-carbon ferromanganese and micro-carbon ferrosilicon during RH alloyingAnd alloy with high Mn and N contents cannot be added. Because the flow of the circulating gas is increased, the circulating speed of the molten steel is accelerated, and the integral RH circulating time is ensured that the circulating frequency of the molten steel is more than or equal to 3 times.
The non-oriented silicon steel W800 is produced by adopting the method of the invention, and the RH circulating gas flow is 150-180 Nm 3 Setting the high vacuum time to be 2500-3000 s, continuously producing 4 furnaces, and detecting the material components as shown in the table 1:
TABLE 1
| Serial number | C％ | Si％ | Mn％ | P％ | S％ | Als％ | N％ |
| 1 | 0.0065 | 0.78 | 0.19 | 0.018 | 0.006 | 0.255 | 0.0029 |
| 2 | 0.003 | 0.82 | 0.23 | 0.016 | 0.006 | 0.257 | 0.0030 |
| 3 | 0.0028 | 0.92 | 0.33 | 0.016 | 0.006 | 0.301 | 0.0025 |
| 5 | 0.0031 | 0.95 | 0.28 | 0.015 | 0.005 | 0.308 | 0.0029 |
As can be seen from Table 1, the N content of the produced non-oriented silicon steel finished product is less than or equal to 0.003 percent, and the requirement of low nitrogen content is met.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A method for controlling nitrogen content in non-oriented silicon steel through RH refining process is characterized by comprising the following steps: during RH refining, argon is used as circulating gas, and the circulating flow of argon is increased, so that the boiling phenomenon of molten steel in a vacuum tank is enhanced, and the denitrification efficiency of the molten steel is improved; meanwhile, low-carbon ferromanganese and micro-carbon ferrosilicon are adopted during RH alloying, and alloy with high N content cannot be added.
2. The method for controlling nitrogen content in non-oriented silicon steel RH refining process according to claim 1, wherein: because the flow of the circulating gas is increased, the circulating speed of the molten steel is accelerated, and the integral RH circulating time is ensured that the circulating frequency of the molten steel is more than or equal to 3 times.
3. The method for controlling nitrogen content in non-oriented silicon steel RH refining process according to claim 1, wherein: the argon gas circulation flow is adjusted to 150-180 Nm 3 /h。
4. The method for controlling nitrogen content in non-oriented silicon steel RH refining process according to claim 1, wherein: the N content of the non-oriented silicon steel finished product is less than or equal to 0.003 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211286771.2A CN115491468A (en) | 2022-10-20 | 2022-10-20 | Method for controlling nitrogen content through RH refining process of non-oriented silicon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211286771.2A CN115491468A (en) | 2022-10-20 | 2022-10-20 | Method for controlling nitrogen content through RH refining process of non-oriented silicon steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115491468A true CN115491468A (en) | 2022-12-20 |
Family
ID=84474468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211286771.2A Pending CN115491468A (en) | 2022-10-20 | 2022-10-20 | Method for controlling nitrogen content through RH refining process of non-oriented silicon steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115491468A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3203839A (en) * | 1962-02-23 | 1965-08-31 | Yawata Iron & Steel Co | Process for producing nonoriented silicon steel sheets |
| US20080095695A1 (en) * | 2006-10-19 | 2008-04-24 | Shanov Vesselin N | Composite catalyst and method for manufacturing carbon nanostructured materials |
| CN113652511A (en) * | 2021-07-16 | 2021-11-16 | 武汉钢铁有限公司 | Smelting method for controlling nitrogen content in silicon-aluminum killed steel to be less than or equal to 0.0013% |
-
2022
- 2022-10-20 CN CN202211286771.2A patent/CN115491468A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3203839A (en) * | 1962-02-23 | 1965-08-31 | Yawata Iron & Steel Co | Process for producing nonoriented silicon steel sheets |
| US20080095695A1 (en) * | 2006-10-19 | 2008-04-24 | Shanov Vesselin N | Composite catalyst and method for manufacturing carbon nanostructured materials |
| CN113652511A (en) * | 2021-07-16 | 2021-11-16 | 武汉钢铁有限公司 | Smelting method for controlling nitrogen content in silicon-aluminum killed steel to be less than or equal to 0.0013% |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1796587A (en) | Orientating silicon steel, manufacturing process and equipment | |
| CN109825763B (en) | Industrial pure iron for high-conductivity cathode flat steel and production method thereof | |
| JP2016539243A (en) | Non-tempered steel and manufacturing method thereof | |
| CN113862433B (en) | Spiral bevel gear grain refining control method | |
| CN110777295A (en) | Hot-rolled steel strip for diamond saw blade base and manufacturing method thereof | |
| CN102876982A (en) | Axle steel and its manufacturing method | |
| CN113403538A (en) | High-contact fatigue performance wheel and production method thereof | |
| CN114351042B (en) | Die steel and preheating treatment method for carbide dispersion in die steel | |
| CN110923389A (en) | Method for smelting low-carbon stainless steel by utilizing GOR converter | |
| CN115491468A (en) | Method for controlling nitrogen content through RH refining process of non-oriented silicon steel | |
| CN114703431B (en) | Heat treatment process for homogenizing hot-work die steel and annealed structure | |
| CN108330246B (en) | method for adding calcium to non-oriented electrical steel in non-vacuum state | |
| KR101320319B1 (en) | Refining method for stainless steel | |
| CN113073179B (en) | Heat treatment method of low-carbon structural steel for cold extrusion | |
| CN112301192B (en) | Vertical annealing process of low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit | |
| CN102211155B (en) | Calcium treatment method of low-carbon low silicon aluminium killed steels under CSP (Cast Steel Plate) condition | |
| CN114672741A (en) | Preparation method of high-strength high-toughness steel BT600HQK for hot forming automobile axle housing | |
| JP3103268B2 (en) | Method for producing steel sheet for containers with excellent fluting resistance | |
| CN108118238B (en) | Method for inhibiting remanence value of non-quenched and tempered steel rolled product | |
| CN110923697A (en) | Preparation method of high-entropy cladding coating for improving surface strength and toughness of die steel | |
| CN107419175B (en) | Economical tool steel with good fatigue life and production method thereof | |
| CN1234882C (en) | Strong magnetic field quick complete annealing process for medium carbon low alloy structure steel | |
| CN115125376B (en) | Post-forging heat treatment process and forging process of G102Cr18Mo stainless steel forging | |
| CN111876656B (en) | Mn-Cu series nodular cast iron forming die blank and heat treatment method thereof | |
| CN114959462B (en) | Steel for new energy automobile motor shaft and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |