CN109797262A - A kind of production method removing abrasion-resistant stee non-metallic inclusion - Google Patents
A kind of production method removing abrasion-resistant stee non-metallic inclusion Download PDFInfo
- Publication number
- CN109797262A CN109797262A CN201910005354.8A CN201910005354A CN109797262A CN 109797262 A CN109797262 A CN 109797262A CN 201910005354 A CN201910005354 A CN 201910005354A CN 109797262 A CN109797262 A CN 109797262A
- Authority
- CN
- China
- Prior art keywords
- steel
- abrasion
- resistant stee
- content
- refining
- 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
Abstract
The present invention discloses a kind of production method for removing abrasion-resistant stee non-metallic inclusion, by being optimized to abrasion-resistant stee steel-smelting production process, reach the quantity for reducing field trash in abrasion-resistant stee steelmaking process, while optimizing molten steel dynamic conditions and large-sized inclusions is promoted to float, improves inclusion size.This method efficiently solves negative effect caused by the amount of inclusions and the poor quality wear-resisting steel plate of size Control in prior art production process, inclusion behavior can be controlled within 1.0, achieve the purpose that whole to promote abrasion-resistant stee internal soundness.
Description
Technical field
The invention belongs to iron and steel technical fields, are related to a kind of production technology for removing abrasion-resistant stee non-metallic inclusion.
Background technique
It is higher and higher to the quality requirement of steel with the progress of modern science and technology and the development of modern industry, to the toughness of steel
It is continuously improved with as defined in intensity and processing performance etc..Steel inclusion has broken the matrix duration of steel, results in steel group
That knits is uneven, seriously affects steel product quality.With the proposition of clean steel concept, even more the control of steel inclusion is proposed severe
The requirement at quarter.Steel inclusion can reduce the plasticity, toughness and fatigue life of steel, so that the processing performance of steel is degenerated, cut to steel plate
It cuts and has a direct impact with welding performance.Wear-resisting steel alloy amount is big, and carbon equivalent is high, is influenced more in processing use process by field trash
Greatly, easily during cutting and bending because field trash influence causes to crack, abrasion-resistant stee steel plate total quality is seriously affected.
Summary of the invention
The technical issues of solving used of the invention: abrasion-resistant stee steel-smelting production process is optimized, it is resistance to reach reduction
The quantity of field trash improves inclusion size simultaneously in mill steel steelmaking process.This method efficiently solves prior art production process
It is negatively affected caused by middle the amount of inclusions and the poor quality wear-resisting steel plate of size Control.It is particularly suitable for production abrasion-resistant stee enterprise
Industry has good promotional value.
The specific technical solution of the present invention is as follows:
A kind of method for making steel removing abrasion-resistant stee non-metallic inclusion, including molten iron pretreatment-converter smelting-refining-company
Casting-rolling process, it is characterised in that:
Hot metal pre process procedures: by S content≤0.07wt%, Si content≤1.25wt%, P content≤0.17wt% iron
Water is pre-processed, and S content≤0.002wt% after control pretreatment in molten iron is to reduce later period LF processing pressure；
Converter smelting process: by pretreated molten iron feeding converter smelt, enter stokehold keep molten iron in P≤
0.17wt%, temperature T >=1150 DEG C control 1600 DEG C of liquid steel temperature > when tapping, and the control of tapping time is in 5min or more, tapping
Deoxidier, refining slag and lime are added according to steel oxygen content in water and control target call in the process and carry out a deoxidation；
Refining procedure: the molten steel that converter smelting process obtains is refined by Ladle Cycling to LF refining furnace, is refined
Aluminum steel is added in journey and carries out secondary deoxidation；Control refining basicity of slag guarantees suction of the slag to field trash between 5-8 in slagging process
Attached ability；Oxygen content being measured according to molten steel, 100-250 meters of calcium lines progress Calcium treatments being added, the oxygen content in molten steel is reduced with depth
And field trash is changed into evenly dispersed oxide containing Ca and is mingled with, to reduce inclusion size, improve Cleanliness of Molten Steel；It hangs
Guarantee is quiet before packet stirs time 5min or more, and to guarantee that field trash has sufficient floating interval of floating dock, bull ladle temperature is controlled in steel grade liquid phase
Above 40-60 DEG C of line temperature, later carry out the degassing of RH vacuum drying oven, vacuum degree control within 3mbar and keep 20-30min with
It is interior, the hydrogen content of molten steel is controlled in 2.5ppm hereinafter, feeding 200 meters of calcium lines after vacuum, is further decreased steel water oxygen and is contained
Amount, while Al2O3 is restored, prevent Al2O3 water blocking mouthh；After Calcium treatment, 15min is stirred according to rhythm of production control is quiet
More than, guarantee that field trash sufficiently floats.
Wherein, during bull ladle to RH vacuum drying oven, bull ladle temperature is controlled above 40-60 DEG C in steel grade liquidus temperature.RH
Vacuum drying oven vacuum degree control is within 3mbar and keeps 20-30min, controls the hydrogen content of molten steel in 2.5ppm or less.
In continuous casting working procedure of the present invention, the molten steel after the degassing of RH vacuum drying oven is transported to continuous casting working procedure by packet greatly, and continuous casting working procedure is complete
Journey protective casting is produced using secondary cooling zone electromagnetic agitation and slighter compress.
In rolling process of the present invention, the qualified blank that continuous casting working procedure obtains is rolled after sending to heating stove heating, is rolled
Process not controlled rolling, steel plate roll rear offline progress heap cold treatment.
Nominal definition:
Non-metallic inclusion: nonmetallic inclusionsin steel refers to oxide, sulfide, the silicon for not having metalline in steel
Hydrochlorate and nitride.They are that addition of the steel in smelting process due to deoxidier forms oxide, silicate and steel and solidifying
Sulfide, the nitride formed in the process due to the decline of certain elements (such as sulphur, nitrogen) solubility, these field trashes have little time to arrange
It stays in steel out.They are frequently as the important indicator for measuring steel quality, type, composition, form, content, size, distribution etc.
Various status considerations all have an impact Steel Properties.
Abrasion-resistant stee: the general name of the strong steel material of abrasion resistance properties.It is widely used in mining machinery, coal fells and transports, engineering machine
The departments such as tool, agricultural machinery, building materials, electric machinery, railway transportation.Wearability is mainly classified in the section 300-600.
Abrasion-resistant stee foreign substance in molten steel Controlling principle of the present invention:
1, guarantee enough calcium additional amounts, change the form that aluminum oxide is mingled with.
2, guarantee that molten steel is quiet and stir level, field trash is promoted sufficiently to float.
3, strict control refines basicity of slag, guarantees refining slag dross inclusion adsorption ability.
The present invention optimizes abrasion-resistant stee steel-smelting production process, reaches and reduces field trash in abrasion-resistant stee steelmaking process
Quantity, while optimize molten steel dynamic conditions promote large-sized inclusions float, improve inclusion size.This method effectively solves
Negative effect caused by the amount of inclusions and the poor quality wear-resisting steel plate of size Control in prior art of having determined production process, can
Inclusion behavior control within 1.0, to be achieved the purpose that whole promotion abrasion-resistant stee internal soundness.
Specific embodiment
Technical solution of the present invention is illustrated with specific embodiment below.
Comparative example one
450 rank abrasion-resistant stees are produced, the S content 0.0012wt% after the pretreatment of molten iron pretreatment stage in molten iron turns
200kg aluminium is added according to oxygen content after furnace tapping and carries out deoxidation, LF carries out slugging after arriving at a station, slugging terminates to carry out alloying, steel
Water constituent is hung to the vacuum processing of RH furnace after meeting internally controlling requirement, and vacuum degree is less than 1.5mbar and keeps 30min, feeds after vacuum
Enter calcium line 180m, it is quiet after Calcium treatment to stir 25min.It is quiet stir after, molten steel is hung to continuous casting, 1550 DEG C of bull ladle temperature, whole
Protective casting produces 260*2070mm section blank using electromagnetic agitation and slighter compress, and blank rolls 40mm specification steel plate, rolls
Sampling carries out field trash ranking afterwards, and the results are shown in Table 1.
As it can be seen from table 1 control of the prior art without the concern for basicity of slag, basicity is often relatively high, does not also have
Guarantee enough calcium additional amounts and molten steel is quiet stirs level, causes level of inclusions relatively low, especially A class is carefully slightly to be with B class, seriously
Influence plate quality.(mainly according to GB/T10561-2005 standard, A, B, C, D, DS is sulfide, aluminium oxide, silicon respectively for grading
Hydrochlorate, spherical oxide, bulky grain are mingled with)
Table 1
Embodiment one: for producing 450 rank abrasion-resistant stees
S content 0.0018wt% after the pretreatment of molten iron pretreatment stage in molten iron, according to oxygen content after converter tapping
220kg aluminium is added and carries out deoxidation, the total quantity of slag control of LF is in 15kg/t, basicity control 6.5, finishing slag alumina content 27%, ingredient
After adjustment, measure total oxygen content 8ppm, 150m calcium line be added and carries out Calcium treatment, feed it is quiet after calcium line stir 10min, it is quiet to stir
After molten steel be hung to RH application of vacuum, vacuum degree is less than 1.5mbar and keeps 30min, feeds calcium line 200m, calcium after vacuum
After treatment is quiet to stir 25min.It is quiet stir after, molten steel is hung to continuous casting, and 1557 DEG C of bull ladle temperature, whole process protection casting uses
Electromagnetic agitation and slighter compress produce 260*2070mm section blank, and blank rolls 50mm specification steel plate, and sampling is mingled with after rolling
Object ranking, the results are shown in Table 2.
2 embodiment of table, one field trash ranking results
Embodiment two: for producing 400 rank abrasion-resistant stees
S content 0.0015% after the pretreatment of molten iron pretreatment stage in molten iron adds according to oxygen content after converter tapping
Enter 250kg aluminium and carry out deoxidation, the total quantity of slag control of LF is in 15kg/t, basicity control 6.1, finishing slag alumina content 24%, ingredient tune
After whole, measure total oxygen content 10ppm, 200m calcium line be added and carries out Calcium treatment, feed it is quiet after calcium line stir 10min, it is quiet to stir
After molten steel be hung to RH application of vacuum, vacuum degree is less than 1.5mbar and keeps 25min, feeds calcium line 200m, calcium after vacuum
After treatment is quiet to stir 20min.It is quiet stir after, molten steel is hung to continuous casting, and 1562 DEG C of bull ladle temperature, whole process protection casting uses
Electromagnetic agitation and slighter compress produce 150*2570mm section blank, and blank rolls 15mm specification steel plate, and sampling is mingled with after rolling
Object ranking, the results are shown in Table 3.
3 embodiment of table, two field trash ranking results
Embodiment three: for producing 450 rank abrasion-resistant stees
S content 0.0015% after the pretreatment of molten iron pretreatment stage in molten iron adds according to oxygen content after converter tapping
Enter 240kg aluminium and carry out deoxidation, the total quantity of slag control of LF is in 15kg/t, basicity control 6.7, finishing slag alumina content 26%, ingredient tune
After whole, measure total oxygen content 10ppm, 200m calcium line be added and carries out Calcium treatment, feed it is quiet after calcium line stir 15min, it is quiet to stir
After molten steel be hung to RH application of vacuum, vacuum degree is less than 1.5mbar and keeps 30min, feeds calcium line 200m, calcium after vacuum
After treatment is quiet to stir 25min.It is quiet stir after, molten steel is hung to continuous casting, and 1554 DEG C of bull ladle temperature, whole process protection casting uses
Electromagnetic agitation and slighter compress produce 260*2270mm section blank, and blank rolls 30mm specification steel plate, and sampling is mingled with after rolling
Object ranking, the results are shown in Table 4.
4 embodiment of table, three field trash ranking results
It can be seen from above-mentioned comparative example and embodiment the method for the present invention by optimization to abrasion-resistant stee smelting process with change
It is kind, by stirring horizontal, refining basicity of slag to calcium additional amount, molten steel are quiet and carrying out strict control, A, B, D type impurity in wear-resisting steel plate
It is greatly improved, and inclusion behavior control is guaranteed into internal quality of steel plate and later period using effect within 1.0.
Claims (5)
1. a kind of method for making steel for removing abrasion-resistant stee non-metallic inclusion, including molten iron pretreatment-converter smelting-refining-continuous casting-
Rolling process, it is characterised in that:
Hot metal pre process procedures: S content≤0.07wt%, Si content≤1.25wt%, P content≤0.17wt% molten iron are carried out
Pretreatment, S content≤0.002wt% after control pretreatment in molten iron；
Converter smelting process: by pretreated molten iron feeding converter smelt, enter stokehold keep molten iron in P≤
0.17wt%, temperature T >=1150 DEG C control 1600 DEG C of liquid steel temperature > when tapping, and the control of tapping time is in 5min or more, tapping
Deoxidier, refining slag and lime are added according to steel oxygen content in water and control target call in the process and carry out a deoxidation；
Refining procedure: the molten steel that converter smelting process obtains is refined by Ladle Cycling to LF refining furnace, in refining process
Aluminum steel is added and carries out secondary deoxidation, control refining basicity of slag is between 5-8 in slagging process；Oxygen content is measured according to molten steel to be added
100-250 meters of calcium lines carry out Calcium treatments, and depth reduces the oxygen content in molten steel, and field trash are changed into evenly dispersed containing Ca
Oxide is mingled with, and reduces inclusion size, improves Cleanliness of Molten Steel；Guarantee before bull ladle it is quiet stir time 5min or more, to guarantee to press from both sides
Sundries has sufficient floating interval of floating dock；The degassing of RH vacuum drying oven is carried out later, feeds 200 meters of calcium lines after vacuum, Calcium treatment terminates
It is quiet afterwards to stir 15min or more.
2. the method for making steel of removal abrasion-resistant stee non-metallic inclusion as described in claim 1, it is characterised in that bull ladle is true to RH
During empty furnace, bull ladle temperature is controlled above 40-60 DEG C in steel grade liquidus temperature.
3. the method for making steel of removal abrasion-resistant stee non-metallic inclusion as described in claim 1, it is characterised in that RH vacuum drying oven is true
Reciprocal of duty cycle control is within 3mbar and keeps 20-30min, controls the hydrogen content of molten steel in 2.5ppm or less.
4. the method for making steel of removal abrasion-resistant stee non-metallic inclusion as described in claim 1, it is characterised in that in continuous casting working procedure,
Molten steel after the degassing of RH vacuum drying oven is transported to continuous casting working procedure, continuous casting working procedure whole process protection casting, using secondary cooling zone electromagnetism by packet greatly
Stirring and slighter compress production.
5. the method for making steel of removal abrasion-resistant stee non-metallic inclusion as described in claim 1, it is characterised in that in rolling process,
The qualified blank that continuous casting working procedure obtains send to heating stove heating after rolled, the operation of rolling not controlled rolling, steel plate roll it is rear it is offline into
Row heap cold treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910005354.8A CN109797262A (en) | 2019-01-03 | 2019-01-03 | A kind of production method removing abrasion-resistant stee non-metallic inclusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910005354.8A CN109797262A (en) | 2019-01-03 | 2019-01-03 | A kind of production method removing abrasion-resistant stee non-metallic inclusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109797262A true CN109797262A (en) | 2019-05-24 |
Family
ID=66558584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910005354.8A Pending CN109797262A (en) | 2019-01-03 | 2019-01-03 | A kind of production method removing abrasion-resistant stee non-metallic inclusion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109797262A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110396635A (en) * | 2019-08-02 | 2019-11-01 | 南京钢铁股份有限公司 | A kind of smelting process improving surrender 345MPa level structure steel fatigue life |
| CN111426811A (en) * | 2020-04-10 | 2020-07-17 | 南京钢铁股份有限公司 | Method for evaluating capacity of RH refining furnace for removing inclusions in vacuum |
| CN111455257A (en) * | 2020-04-29 | 2020-07-28 | 南京钢铁股份有限公司 | Control method of steel inclusion for railway bogie |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921892A (en) * | 2010-09-02 | 2010-12-22 | 南京钢铁股份有限公司 | Calcium treatment method for molten steel in steelmaking |
| CN102260768A (en) * | 2011-08-01 | 2011-11-30 | 南京钢铁股份有限公司 | Static mixing method for steelmaking molten steel |
| CN102719766A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Wear-resistant steel with high strength and production method thereof |
| CN109079114A (en) * | 2018-08-27 | 2018-12-25 | 南京钢铁股份有限公司 | A method of abrasion-resistant stee is produced using slab secondary cooling zone electromagnetic agitation |
-
2019
- 2019-01-03 CN CN201910005354.8A patent/CN109797262A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921892A (en) * | 2010-09-02 | 2010-12-22 | 南京钢铁股份有限公司 | Calcium treatment method for molten steel in steelmaking |
| CN102719766A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Wear-resistant steel with high strength and production method thereof |
| CN102260768A (en) * | 2011-08-01 | 2011-11-30 | 南京钢铁股份有限公司 | Static mixing method for steelmaking molten steel |
| CN109079114A (en) * | 2018-08-27 | 2018-12-25 | 南京钢铁股份有限公司 | A method of abrasion-resistant stee is produced using slab secondary cooling zone electromagnetic agitation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110396635A (en) * | 2019-08-02 | 2019-11-01 | 南京钢铁股份有限公司 | A kind of smelting process improving surrender 345MPa level structure steel fatigue life |
| CN111426811A (en) * | 2020-04-10 | 2020-07-17 | 南京钢铁股份有限公司 | Method for evaluating capacity of RH refining furnace for removing inclusions in vacuum |
| CN111455257A (en) * | 2020-04-29 | 2020-07-28 | 南京钢铁股份有限公司 | Control method of steel inclusion for railway bogie |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102703834B (en) | Grain-refined gear steel and production process thereof | |
| CN102051530B (en) | 48MnV nitrogenous steel and nitrogen adding process thereof | |
| CN109252008A (en) | A kind of production method of low carbon, low nitrogen ultralow-sulfur steel | |
| CN102634732B (en) | Smelting method of high-carbon chromium bearing steel | |
| CN109797262A (en) | A kind of production method removing abrasion-resistant stee non-metallic inclusion | |
| CN107604250A (en) | A kind of heavy truck transmission gear 21MnCrMoS steel and its manufacture method | |
| CN112899560B (en) | High-strength gear steel 23CrMnMoS and manufacturing method thereof | |
| CN109082496A (en) | A kind of method of whole process hypoxemia position smelting suprelow carbon steel | |
| CN113846260B (en) | Production method of high-strength steel plate for engineering machinery | |
| CN113215472B (en) | Niobium-vanadium microalloyed high-strength fine-grain non-quenched and tempered cold forging steel square billet and manufacturing method thereof | |
| CN106987760A (en) | A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method | |
| CN114318154A (en) | High-cleanliness welding wire steel L-S3 and preparation method thereof | |
| CN109554605A (en) | A kind of Control on Oxide Inclusions method of LD-RH technique production ultra-low-carbon steel | |
| CN101016599A (en) | Low carbon equivalent micro-alloy steel pipe and on-line normalizing process thereof | |
| CN113025901A (en) | Steel for petroleum valve body and preparation method thereof | |
| CN114293101B (en) | Economical high-grade welding wire steel H04E and preparation method thereof | |
| CN111471920A (en) | Non-quenched and tempered steel for U-shaped bolt and production method thereof | |
| CN111334718A (en) | European standard R260Mn steel rail and production method thereof | |
| CN114480987A (en) | Rare earth-containing NM600 wear-resistant steel plate and preparation method thereof | |
| CN101694250B (en) | 500MPa-grade VN alloying non-tempering seamless steel tube and manufacturing method thereof | |
| CN111471936A (en) | Improved steel for agricultural machinery cutting tool and production method thereof | |
| CN108642239B (en) | Method for alloying molten steel silicon and treating calcium by using metal-containing calcium-silicon-iron alloy | |
| CN116657043A (en) | Steel for low-alkalinity bead wire and production process thereof | |
| CN114231844B (en) | Economical welding wire steel BZJ60-Ti and production and preparation method thereof | |
| CN113122779B (en) | Fine-grain normalizing-free tool steel and production 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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190524 |