CN107760824B - The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel - Google Patents
The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
The invention discloses the smelting processes that sulphide inculsion in a kind of non-hardened and tempered steel or pinion steel modifies, the realization of its modifying process mainly feeds silicon magnesium calcium composite core-spun yarn into the molten steel after refining, or silicon magnesium, silico-calcium core-spun yarn are fed respectively, so that the full content of magnesium in steel is between 4~25ppm, calcium content is between 5~25ppm.The content that the present invention passes through oxygen, sulphur, manganese, calcium, magnesium, aluminium in optimization refining process steel, the field trash modification to non-hardened and tempered steel, pinion steel can effectively be implemented, and then control form, the size, distribution of sulfide, make the field trash in non-hardened and tempered steel and pinion steel to " internal hardening oxidation substance point, external covering sulfide " duplex impurity transformation, promotes the quality of special steel.
Description
Technical field
The present invention relates to the preparation methods of a kind of non-hardened and tempered steel or pinion steel, more particularly to a kind of non-hardened and tempered steel or gear
The refining treatment technique of steel, further relates to a kind of inclusion control method, is applied to technical field of ferrous metallurgy.
Background technique
Pinion steel, non-hardened and tempered steel belong to the special steel of sulfur-bearing, and the sulphide inculsion in steel during the cutting process can be significant
The cutting ability for improving steel, the machine cut cost for reducing steel have valuable help.In general, the element sulphur in non-hardened and tempered steel
Sulfur content of the content in 0.03~0.08%, pinion steel is 0.02~0.06%.Non-hardened and tempered steel is guaranteeing that quenched and tempered steel is comprehensive
On the basis of closing performance, Tempering and Quenching is eliminated by the tough method such as microalloying, controlled rolling and controlled cooling, one third can be reduced
Above cost is a kind of energy-efficient steel.Pinion steel be dosage is larger, more demanding in automotive material critical material it
One, not only influence vehicle ages, the economic indicators such as energy consumption, but also be also to closing for meeting safe and environment-friendly and comfort requirement
It is important.There are huge non-hardened and tempered steel and pinion steel market in China, and automobile engine crankshaft, camshaft, preceding bridge, rear axle, turns connecting rod
It can be manufactured to the power-transmission systems such as torsion bar, drive axle, rear drive shaft, wheel hub part by non-hardened and tempered steel, weight accounts for vapour
The 20%~30% of car weight amount, adds gearbox, and the total weight of the special steel of sulfur-bearing accounts for about the one third of vehicle weight.
Non-hardened and tempered steel, the pinion steel of domestic many steel mills can be only applied to more low-grade agricultural vehicle, agricultural machinery, motorcycle,
Key technology gap is exactly that the form of sulfide in sulfur-bearing special steel cannot be controlled effectively, cause steel anti-fatigue performance, easily
Cutting ability is bad.The D type impurity of hard is the main cause of part failure in steel, and restricts the key of steel anti-fatigue performance.
Traditional cleaning steel smelting stresses field trash removing, especially D type impurity, but the higher removing of cleanliness is more difficult,
Therefore the innoxious modification of field trash becomes the emphasis for improving performance.The non-hardened and tempered steel of steel mill, country production at present, pinion steel are universal
Improve the form of sulfide in steel using the technology path of calcium modification, but field trash ellipsoid ratio is lower after calcium modification and ruler
Very little larger, effect is ideal not to the utmost.The sulfur-bearing special steel of high-quality, sulfide is uniformly distributed in steel in ellipsoid, in steel rolling
It hardly deforms in the process, has not only overcome sulfide easily-deformable the drawbacks of leading to anisotropy, but also efficiently solve hard oxygen
Compound isolates the drawbacks of steel matrix, so that the cutting ability of steel and anti-fatigue performance are substantially improved.Therefore, by non-hardened and tempered steel, tooth
The form for taking turns sulfide in steel becomes the key for improving pinion steel, non-hardened and tempered steel performance to the regulation of ellipsoid direction.
The Chinese patent of Publication No. CN102605143A discloses a kind of magnalium calcium alloy and its is controlling stainless steel clamp
Application in sundries, ingredient are as follows: Al:60.0~80.0%, Mg:8.0~18.0%, Ca:10.0~20.0%, remaining is iron
And inevitable impurity.The Alloyapplication is carrying out deep deoxidation, desulfurization and inclusions class to stainless steel, makes in steel
Sulfur content reduces and is formed the complex inclusion of size small and dispersed, improves the cleanliness of steel and improves the performance of steel.Using one
The alloy of kind magnesium-aluminum-calcium, application are stainless steels, and mechanism of action is " to carry out deep deoxidation, desulfurization to stainless steel and be mingled with
Object denaturation treatment ", this has apparent area with the action principle for the refining for being applied to non-hardened and tempered steel or pinion steel, effective object
Not.In addition, application No. is a kind of 20MnCr free-cutting pinion steels of the sulphur of calcium containing magnesium of the patent application publication of 201610163260.X
And preparation method thereof, application No. is a kind of non-tune of 45MnVS Cutting free of calcium containing magnesium of 201610163261.4 patent application publication
Matter steel and its manufacturing method, application No. is a kind of automatic steel of calcium containing magnesium of 201610163553.8 patent application publication and lifes
Production. art is related to ingredient control method and production technology to ASTM1151 steel.Above patent document is not mainly for folder
The technical solution that the refinery practice link of sundries modification is controlled.Non-hardened and tempered steel, pinion steel, which are commonly used, feeds silicon-calcium wire
Or pure calcium line technique, calcium modifying process effect is undesirable, and sulfide index ellipsoid is low, to the free-cutting machinability of non-hardened and tempered steel, pinion steel
It can be not ideal enough with the improvement result of anti-fatigue performance.
Summary of the invention
In order to solve prior art problem, it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel, in the micro addition magnesium calcium of liquid steel refining process to Micro Alloying
Sulphide inculsion is modified in steel and pinion steel, and the content of oxygen, sulphur, manganese, calcium, magnesium, aluminium in steel is controlled by refining process, into
And control Mn/S, Ca/S, Mg/S；Form, the size, distribution for controlling sulfide, make the field trash in non-hardened and tempered steel and pinion steel
Change to " internal hardening oxidation substance point, external covering sulfide " duplex impurity direction, promotes special steel quality.Side of the present invention
Method can increase the index ellipsoid of sulfide, reduce inclusion size, control inclusion distribution, significantly improve non-hardened and tempered steel, gear
The free cutting property and anti-fatigue performance of steel.
Purpose is created to reach foregoing invention, the present invention adopts the following technical solutions:
The smelting process of sulphide inculsion modification in a kind of non-hardened and tempered steel or pinion steel, for the field trash after liquid steel refining
Modifying process, comprising the following steps:
A. molten iron is just refined by electric furnace or converter, after LF refining, vacuum processing, makes C, Si, Mn, P in molten steel
Main alloy element reaches the component requirements of pinion steel or non-hardened and tempered steel, obtains preliminary refining treatment molten steel；Make preferred technology
Scheme, Cr, Mo, V, N alloying element in preliminary refining treatment molten steel also reach the component requirements of pinion steel or non-hardened and tempered steel；
B. the mass percentage content for controlling sulphur in the molten steel prepared in the step a is not higher than 0.005%, oxygen content
Not higher than 6ppm, the mass percentage content of aluminium is not higher than 0.012%, and makes molten steel temperature control at 1566~1596 DEG C,
Then start to feed core-spun yarn into molten steel, field trash modifying process is carried out to molten steel；In carrying out refining modifying process technique,
Silicon magnesium calcium composite core-spun yarn is fed into molten steel, or feeds silicon magnesium core-spun yarn and silico-calcium core-spun yarn respectively, makes to change by refining
The content of magnesium of the molten steel prepared after matter processing is 4~25ppm, and calcium content is 5~25ppm；Make preferred technical solution, core-spun yarn
Additional amount converts the mark of feeding 57~357g of magnesium metal and molten steel per ton conversion feeding 50~250g of calcium metal according to molten steel per ton
Standard carries out refining modifying process to molten steel.The ratio of silicon magnesium calcium composite core-spun yarn are as follows: magnesium 5%~20%, calcium 0~15%, surplus
For silicon and inevitable impurity, silicon magnesium calcium, the specific ratio of silicon magnesium composite core-spun yarn are referring to table 1:
1 silicon magnesium calcium of table, silicon magnesium composite core-spun yarn concrete component ratio
C. after having fed core-spun yarn to molten steel in the step b, then to molten steel soft blow argon at least 15 minutes, backward molten steel
In continue feed bright sulfur line, make to prepare the sulfur content in the molten steel of non-hardened and tempered steel and reach 0.03~0.08%, or make to prepare tooth
The sulfur content taken turns in the molten steel of steel reaches 0.02~0.06%；
D. after completing sulphur line feeding technique in the step c, then molten steel carries out 5~10 points of soft blow argon to treated
Clock keeps molten steel component uniform, and bull ladle is cast later, obtains non-hardened and tempered steel or pinion steel ingot casting.
As a preferred technical solution of the invention, the smelting of sulphide inculsion modification in non-hardened and tempered steel or pinion steel
Method can carry out modifying process to sulphide inculsion in 20MnCr5 pinion steel, in the step a, make C, Si in molten steel,
Mn, P and Cr alloying element reach 20MnCr pinion steel component requirements, obtain preliminary refining treatment molten steel；It is carried out in the step b
It refines in modifying process technique, silicon magnesium calcium composite core-spun yarn is fed into molten steel to be made after having fed core-spun yarn to molten steel by essence
The content of magnesium of the molten steel prepared after refining modifying process is 5~20ppm, and calcium content is 10~25ppm；In the step c, Xiang Gang
Continue to feed bright sulfur line in liquid, the sulfur content in molten steel is made to reach 0.020~0.055%.Make preferred technical solution, described
In step b, core-spun yarn additional amount converts feeding 71~286g of magnesium metal and molten steel per ton conversion feeding metal according to molten steel per ton
The standard of 100~250g of calcium carries out refining modifying process to molten steel.Make preferred technical solution, in the step d, obtains
20MnCr5 pinion steel main component and component weight percentages are as follows: C:0.15~0.25%, Si≤0.12%, Mn:0.80
~1.50%, P≤0.035%, S:0.020~0.055%, Cr:0.80~1.30%.
As the preferred technical solution of another kind of the invention, the smelting of sulphide inculsion modification in non-hardened and tempered steel or pinion steel
Smelting method, can to sulphide inculsion modifying process in 45MnVS non-hardened and tempered steel, in the step a, make C, Si in molten steel,
Mn, P and Cr, Ni, V, N alloying element reach 45MnVS non-hardened and tempered steel component requirements, obtain preliminary refining treatment molten steel；Described
Step b feed silicon magnesium core-spun yarn and silico-calcium core-spun yarn respectively in refining modifying process technique, feeding core-spun yarn to molten steel
Afterwards, make 10~25ppm of content of magnesium of the molten steel prepared after refining modifying process, calcium content is 5~20ppm；Described
In step c, continues to feed bright sulfur line into molten steel, the sulfur content in molten steel is made to reach 0.040~0.080%.Make preferred skill
Art scheme, in the step b, core-spun yarn additional amount converts feeding 143~357g of magnesium metal and steel per ton according to molten steel per ton
The standard of liquid conversion feeding 50~200g of calcium metal, carries out refining modifying process to molten steel.Make preferred technical solution, described
In step d, the main component and component weight percentages of obtained 45MnVS non-hardened and tempered steel are as follows: C:0.42~0.51%, Si:
0.15~0.6%, Mn:0.90~1.50%, P:0.003~0.035%, S:0.040~0.080%, Ni:0.10~
0.30%, V:0.06~0.13%, Cr≤0.30%, N:0.012~0.015%.
Technical solution of the present invention principle:
Why the application feeds calcium constituent into molten steel, is because main inclusions are Al in Al dexidized steel2O3, and
Al2O3It is mingled with hardness height and has sharp corner angle, easily scratches matrix in steel following process process, and due to its fusing point
Height is easy to adhere in mouth of a river inner wall, influences going on smoothly for casting, or even will cause the major accidents such as nozzle blocking.In order to keep away
Exempt from pure Al2O3The generation being mingled with makes Al with Ca treatment process2O3It is mingled with to react with CaO and generates the calcium aluminate of low melting point and be mingled with
(such as 12CaO7Al2O3).At this moment, the MnS in steel is mingled with experience Ca+O → CaO；Ca+S→CaS；m(CaO)+n(Al2O3)
→(CaO)m(Al2O3)nEqual reactions are transformed to CaS or CaOAl2O3The complex inclusion of CaS, effectively prevents Al2O3
Caused by nozzle blocking.
[Ca], [S], [O] move to Al with diffusion way in molten steel2O3It is mingled with surface, with continuing deeper into for reaction, steel
In Al2O3It is mingled with and experienced CaO6Al2O3→CaO·2Al2O3→CaO·Al2O3→12CaO·7Al2O3→3CaO·
Al2O3Transition process.But in this process, when [O] content around field trash surface is reduced to lower value, it will
The CaS for generating compact structure is mingled with, and is wrapped in the periphery that calcium-aluminate is mingled with, prevents CaO and Al2O3Reaction further into
Row, so before field trash is changed into liquid, it is necessary to assure there is enough CaO contents in field trash.
By carrying out Calcium treatment to molten steel, it can make in molten steel that there are the calcium of certain content, to make to generate using aluminium deoxidation
The dystectic brittleness Al of bulky grain2O3It is mingled with denaturation and is mingled with (12CaO as the higher low melting point calcium-aluminate of calcium content
7Al2O3Deng), it so that the field trash of low melting point is floated in molten steel removal, can also improve caused by being mingled with because of refractory oxide
The nozzle blocking of molten steel casting process, while also reducing influence of the high-melting-point brittle inclusion to steel product quality.It is solidifying in molten steel
Gu during, the oxidation product of calcium can promote the precipitation of sulfide and uniformly dividing for sulfide as sulfide forming core core
Cloth.Calcium can also play the role of changing oxide morphology.Calcium is added in steel and forms compound (Mn, Ca) S, can reduce sulfide
The horizontal mechanical performance of deformability improvement steel.Suitable calcium additive amount proposed by the present invention are as follows: metal is added in molten steel per ton
50~250g of calcium, so that the Calcium nutrient in steel is between 5~25ppm, calcium recovery rate is close to 10%.
Magnesium is the metallic element more more active than Al, and not will form magnesia it is cotton-shaped be mingled with blocking the mouth of a river.In molten steel
In process of setting, oxidation product MgO, MgOAl2O3The forming core core that can be used as sulfide, promote sulfide precipitation and
Even distribution.Magnesium can also play change oxide morphology, formed and pressed from both sides using magnesia as core, manganese sulfide for the spindle of coating
It is miscellaneous, to improve free-cutting machinability.Magnesium generates following serial reaction after being added in molten steel:
(chemical formula one) [Mg]+[O]=MgO (s) △ G1 θ=-731400+239.68T
(chemical formula two) 2 [Al]+3 [O]=Al2O3(s) △G3 θ=-1202070+386.28T
(chemical formula three) [Mg]+[S]=MgS (s) △ G2 θ=-537258.5+205.77T
(chemical formula four) [Ca]+[S]=CaS (s) △ G1 θ=-541158.26+193.33T
(chemical formula five) MgO (s)+Al2O3(s)=MgOAl2O3(s) △G4 θ=-35600-2.09T
+ 2 [Al]=MgOAl of (chemical formula six) [Mg]+4 [O]2O3(s) △G5 θ=-1969070+623.87T
By the thermodynamical equilibrium relationship of Mg, Ca, O, S, can when making steel temperature 1873K balance, [Mg] in steel, [O],
The equilibrium concentration relationship of [S] meets attached drawing 1.
Fig. 1 is that magnesium with aluminium interaction occurs deoxidation, modifies two kinds of thermodynamical equilibrium figures reacted in molten steel at 1600 DEG C.
After molten steel feeds magnesium, to ensure to occur field trash modification reaction, rather than deoxygenation, the content of magnesium in molten steel should meet position
B area on " 2 line " in Fig. 1, under " 1 line "；Otherwise deoxygenation will occur for the region C such as on " 1 line ", reach
Less than the purpose of modification；As being located at the a-quadrant under " 2 line ", then the content of magnesium fed is too low, and modification reaction will not both occur,
Deoxygenation will not occur.Therefore, the application proposes the additional amount of magnesium are as follows: molten steel conversion feeding magnesium metal 57 per ton~
357g, so that the full content of magnesium in steel is between 4~25ppm, magnesium recovery rate is close to 7%, it can be ensured that it is anti-that modification can occur for molten steel
It answers.
The present invention compared with prior art, have the advantages that following obvious prominent substantive distinguishing features and:
1. the present invention uses the technique of the compound modification of magnesium calcium, primarily directed to non-hardened and tempered steel and pinion steel, modifying process
Realization is core-spun yarn by feeding from siliceous magnesium calcium to the molten steel after refining or the core-spun yarn for feeding siliceous magnesium, silico-calcium respectively, this
Inventive method can increase the index ellipsoid of sulfide, reduce inclusion size, control inclusion distribution, significantly improve Micro Alloying
The free cutting property and anti-fatigue performance of steel, pinion steel；
2. the present invention can effectively be implemented by the content of oxygen, sulphur, manganese, calcium, magnesium, aluminium in optimization refining process steel to non-tune
The field trash modification of matter steel, pinion steel, and then form, the size, distribution of sulfide are controlled, make in non-hardened and tempered steel and pinion steel
Field trash promotes the quality of special steel to " internal hardening oxidation substance point, external covering sulfide " duplex impurity transformation.
Detailed description of the invention
Fig. 1 is that magnesium and aluminium interact two kinds of deoxidation, modification thermodynamical equilibrium figures reacted occurs in molten steel of the present invention.
Specific embodiment
Above scheme is described further below in conjunction with specific implementation example, the preferred embodiment of the present invention is described in detail such as
Under:
Embodiment one:
In the present embodiment, the smelting process that sulphide inculsion modifies in a kind of pinion steel, to sulphur in 20MnCr5 pinion steel
Compound is mingled with modifying process, comprising the following steps:
A. molten iron is just refined by electric furnace, after LF refining, vacuum processing, closes C, Si, Mn, P and Cr in molten steel
Gold element reaches 20MnCr pinion steel component requirements, obtains preliminary refining treatment molten steel；
B. the mass percentage content for controlling sulphur in the molten steel prepared in the step a is not higher than 0.005%, oxygen content
Not higher than 6ppm, the mass percentage content of aluminium is not higher than 0.012%, and makes molten steel temperature control 1566~1596
DEG C, then start to feed core-spun yarn into molten steel, refining modifying process is carried out to molten steel；Carrying out refining modifying process technique
In, silicon magnesium calcium (Mg:20%, Ca:15%, Si:65%) composite core-spun yarn is fed into molten steel, core-spun yarn additional amount is according to per ton
The standard of molten steel conversion feeding 71~286g of magnesium metal and molten steel per ton conversion feeding 100~250g of calcium metal, carry out molten steel
Refine modifying process, after having fed core-spun yarn to molten steel, make the content of magnesium 5 of the molten steel prepared after refining modifying process~
20ppm, calcium content are 10~25ppm；In the present embodiment, magnesium recovery rate is close to 7%, and calcium recovery rate is close to 10%；Feed cored
Line modification before: control steel in sulfur content 0.005% hereinafter, oxygen content in 6ppm hereinafter, aluminium content 0.012% hereinafter,
And at 1566-1596 DEG C, hypoxemia, low-sulfur, aluminium appropriate are to ensure that field trash modifies successfully important item for molten steel temperature control
Otherwise magnesium calcium constituent is added in part when hyperoxia, high-sulfur, deoxidation, desulphurization reaction will occur, rather than modify reaction；In order to guarantee to change
Matter effect, the present embodiment need to meet mentioned component control for pinion steel modification and require；
C. after having fed core-spun yarn to molten steel in the step b, then to molten steel soft blow argon 15 minutes, backward molten steel relaying
Continuous feeding bright sulfur line, makes the sulfur content in molten steel reach 0.020~0.055%；
D. after completing sulphur line feeding technique in the step c, then molten steel carries out 5~10 points of soft blow argon to treated
Clock keeps molten steel component uniform, and bull ladle is cast later, obtains 20MnCr5 pinion steel ingot casting, main component and Ingredients Weight
Percentage are as follows: C:0.15~0.25%, Si≤0.12%, Mn:0.80~1.50%, P≤0.035%, S:0.020~
0.055%, Cr:0.80~1.30%.
The realization of the modifying process of the present embodiment mainly feeds silicon magnesium calcium composite core-spun yarn into the molten steel after refining, leads to
The content for crossing oxygen, sulphur, manganese, calcium, magnesium, aluminium in optimization refining process steel can effectively implement the field trash modification to pinion steel, in turn
Form, the size, distribution for controlling sulfide make the field trash in pinion steel to " internal hardening oxidation substance point, outside cover sulphur
The transformation of compound " duplex impurity, promotes the quality of special steel.
Embodiment two:
The present embodiment is basically the same as the first embodiment, and is particular in that:
In the present embodiment, the smelting process that sulphide inculsion modifies in a kind of non-hardened and tempered steel, to 45MnVS non-hardened and tempered steel
Middle sulphide inculsion modifying process, comprising the following steps:
A. molten iron is just refined by converter, after LF refining, vacuum processing, make C, Si, Mn, P and Cr in molten steel,
Ni, V, N alloying element reach 45MnVS non-hardened and tempered steel component requirements, obtain preliminary refining treatment molten steel；
B. the mass percentage content for controlling sulphur in the molten steel prepared in the step a is not higher than 0.005%, oxygen content
Not higher than 6ppm, the mass percentage content of aluminium is not higher than 0.012%, and makes molten steel temperature control 1566~1596
DEG C, then start to feed core-spun yarn into molten steel, refining modifying process is carried out to molten steel；Carrying out refining modifying process technique
In, it feeds silicon magnesium core-spun yarn (Mg:20%, Si:80%) respectively and silico-calcium core-spun yarn, core-spun yarn additional amount is rolled over according to molten steel per ton
The standard for calculating feeding 143~357g of magnesium metal and molten steel per ton conversion feeding 50~200g of calcium metal, carries out refining to molten steel and changes
Matter processing, after having fed core-spun yarn to molten steel, make the content of magnesium 10 of the molten steel prepared after refining modifying process~
25ppm, calcium content are 5~20ppm, and in the present embodiment, magnesium recovery rate is close to 7%, and calcium recovery rate is close to 10%；Feed core-spun yarn
Before modification: control steel in sulfur content 0.005% hereinafter, oxygen content in 6ppm hereinafter, aluminium content 0.012% hereinafter, simultaneously
And molten steel temperature control, at 1566-1596 DEG C, hypoxemia, low-sulfur, aluminium appropriate are to ensure that field trash modifies successful essential condition,
Otherwise magnesium calcium constituent is added when hyperoxia, high-sulfur, deoxidation, desulphurization reaction will occur, rather than modify reaction；In order to guarantee modification effect
Fruit, the present embodiment need to meet mentioned component control for quenched and tempered steel modification and require；After having above-mentioned condition, reality can be started
Apply modifying process；
C. after having fed core-spun yarn to molten steel in the step b, then to molten steel soft blow argon 15 minutes, backward molten steel relaying
Continuous feeding bright sulfur line, makes the sulfur content in molten steel reach 0.040~0.080%；
D. after completing sulphur line feeding technique in the step c, then molten steel carries out 5~10 points of soft blow argon to treated
Clock keeps molten steel component uniform, and bull ladle is cast later, obtains 45MnVS non-hardened and tempered steel ingot casting, main component and ingredient weight
Measure percentage are as follows: C:0.42~0.51%, Si:0.15~0.6%, Mn:0.90~1.50%, P:0.003~0.035%, S:
0.040~0.080%, Ni:0.10~0.30%, V:0.06~0.13%, Cr≤0.30%, N:0.012~0.015%.
The realization of the modifying process of the present embodiment mainly feeds silicon magnesium calcium composite core-spun yarn into the molten steel after refining, or
Person feeds silicon magnesium, silico-calcium core-spun yarn respectively, can be effective by the content of oxygen, sulphur, manganese, calcium, magnesium, aluminium in optimization refining process steel
Implement to modify the field trash of non-hardened and tempered steel, and then control form, the size, distribution of sulfide, makes being mingled in non-hardened and tempered steel
Object promotes the quality of special steel to " internal hardening oxidation substance point, external covering sulfide " duplex impurity transformation.
The embodiment of the present invention is illustrated above in conjunction with attached drawing, but the present invention is not limited to the above embodiments, it can be with
The purpose of innovation and creation according to the present invention makes a variety of variations, under the Spirit Essence and principle of all technical solutions according to the present invention
Change, modification, substitution, combination or the simplification made, should be equivalent substitute mode, as long as meeting goal of the invention of the invention,
Without departing from the technical principle and invention structure of the smelting process that sulphide inculsion in non-hardened and tempered steel of the present invention or pinion steel modifies
Think, belongs to protection scope of the present invention.
Claims (6)
1. the smelting process that sulphide inculsion modifies in a kind of non-hardened and tempered steel or pinion steel, which is characterized in that be used for liquid steel refining
Field trash modifying process afterwards, comprising the following steps:
A. molten iron is just refined by electric furnace or converter, after LF refining, vacuum processing, keeps C, Si, Mn, P in molten steel main
Alloying element reaches the component requirements of pinion steel or non-hardened and tempered steel, obtains preliminary refining treatment molten steel；
In the step a, Cr, Mo, V, N alloying element in preliminary refining treatment molten steel reach pinion steel or non-hardened and tempered steel at
Divide and requires；
B. the mass percentage content of sulphur in the molten steel prepared in the step a is controlled not higher than 0.005%, and oxygen content is not high
It is not higher than 0.012% in the mass percentage content of 6ppm, aluminium, and makes molten steel temperature control at 1566~1596 DEG C, then
Start to feed the core-spun yarn containing magnesium, calcium into molten steel, field trash modifying process is carried out to molten steel；Carrying out refining modifying process work
In skill, silicon magnesium calcium composite core-spun yarn is fed into molten steel, or feeds silicon magnesium core-spun yarn and silico-calcium core-spun yarn respectively, is made by essence
The content of magnesium of the molten steel prepared after refining modifying process is 4~25ppm, and calcium content is 5~25ppm；Silicon magnesium calcium composite core-spun yarn
Ratio are as follows: magnesium 5%~20%；Calcium 0~15%；Surplus is silicon and inevitable impurity；
C. after having fed core-spun yarn to molten steel in the step b, then to molten steel soft blow argon at least 15 minutes, backward molten steel relaying
Continuous feeding bright sulfur line, makes to prepare the sulfur content in the molten steel of non-hardened and tempered steel and reaches 0.03~0.08%, or make to prepare pinion steel
Molten steel in sulfur content reach 0.02~0.06%；
D. after completing sulphur line feeding technique in the step c, then to treated, molten steel is carried out soft blow argon 5~10 minutes, is made
Molten steel component is uniform, and bull ladle is cast later, obtains non-hardened and tempered steel or pinion steel ingot casting.
2. according to claim 1 in non-hardened and tempered steel or pinion steel sulphide inculsion modification smelting process, it is characterised in that:
In the step b, core-spun yarn additional amount converts feeding 57~357g of magnesium metal according to molten steel per ton and molten steel per ton conversion is fed
The standard for entering 50~250g of calcium metal carries out refining modifying process to molten steel.
3. according to claim 1 in non-hardened and tempered steel or pinion steel sulphide inculsion modification smelting process, it is characterised in that:
To sulphide inculsion modifying process in 20MnCr5 pinion steel, in the step a, make C, Si, Mn, P and Cr alloy in molten steel
Element reaches 20MnCr pinion steel component requirements, obtains preliminary refining treatment molten steel；Refining modifying process is carried out in the step b
In technique, feed silicon magnesium calcium composite core-spun yarn into molten steel makes after refining modifying process after having fed core-spun yarn to molten steel
The content of magnesium of the molten steel of preparation is 5~20ppm, and calcium content is 10~25ppm；In the step c, continue to feed into molten steel
Bright sulfur line makes the sulfur content in molten steel reach 0.020~0.055%；
In the step b, core-spun yarn additional amount converts feeding 71~286g of magnesium metal according to molten steel per ton and molten steel per ton is converted
The standard for feeding 100~250g of calcium metal, carries out refining modifying process to molten steel.
4. according to claim 3 in non-hardened and tempered steel or pinion steel sulphide inculsion modification smelting process, it is characterised in that:
In the step d, the main component and component weight percentages of obtained 20MnCr5 pinion steel are as follows: C:0.15~0.25%,
Si≤0.12%, Mn:0.80~1.50%, P≤0.035%, S:0.020~0.055%, Cr:0.80~1.30%.
5. according to claim 1 in non-hardened and tempered steel or pinion steel sulphide inculsion modification smelting process, it is characterised in that:
To sulphide inculsion modifying process in 45MnVS non-hardened and tempered steel, in the step a, make C, Si, Mn, P and Cr in molten steel,
Ni, V, N alloying element reach 45MnVS non-hardened and tempered steel component requirements, obtain preliminary refining treatment molten steel；It is carried out in the step b
Refine in modifying process technique, feed silicon magnesium core-spun yarn and silico-calcium core-spun yarn respectively, after having fed core-spun yarn to molten steel, make by
The content of magnesium of the molten steel prepared after refining modifying process is 10~25ppm, and calcium content is 5~20ppm；In the step c, to
Continue to feed bright sulfur line in molten steel, the sulfur content in molten steel is made to reach 0.040~0.080%；
In the step b, core-spun yarn additional amount converts feeding 143~357g of magnesium metal according to molten steel per ton and molten steel per ton is converted
The standard for feeding 50~200g of calcium metal, carries out refining modifying process to molten steel.
6. according to claim 5 in non-hardened and tempered steel or pinion steel sulphide inculsion modification smelting process, it is characterised in that:
In the step d, the main component and component weight percentages of obtained 45MnVS non-hardened and tempered steel are as follows: C:0.42~
0.51%, Si:0.15~0.6%, Mn:0.90~1.50%, P:0.003~0.035%, S:0.040~0.080%, Ni:
0.10~0.30%, V:0.06~0.13%, Cr≤0.30%, N:0.012~0.015%.
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| CN110656219A (en) * | 2018-06-29 | 2020-01-07 | 上海梅山钢铁股份有限公司 | Method for controlling center segregation of fine blanking steel 40MnB continuous casting slab |
| CN109735684A (en) * | 2019-02-18 | 2019-05-10 | 山东钢铁股份有限公司 | A method of improving Tempered Steel Containing Sulphur castability and transverse impact toughness |
| CN110117694B (en) * | 2019-04-09 | 2021-06-04 | 上海大学 | Magnesium adding process for magnesium-containing free-cutting steel |
| CN109988883B (en) * | 2019-04-09 | 2021-05-07 | 上海大学 | Magnesium-calcium adding process method of magnesium-calcium containing non-quenched and tempered steel |
| CN111154945B (en) * | 2020-01-17 | 2021-05-28 | 中天钢铁集团有限公司 | Control method for liquated nitrides in Ti and V microalloyed aluminum deoxidized sulfur-containing non-quenched and tempered steel |
| CN111172351B (en) * | 2020-01-17 | 2021-07-30 | 中天钢铁集团有限公司 | Control method for medium-carbon sulfur-containing aluminum deoxidized non-quenched and tempered steel Ds inclusion |
| CN112195305A (en) * | 2020-09-17 | 2021-01-08 | 南京钢铁股份有限公司 | Method for refining grain size of sulfur-containing non-quenched and tempered steel |
| CN113088788B (en) * | 2021-03-03 | 2022-03-15 | 武汉科技大学 | Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel |
| CN113430465A (en) * | 2021-07-06 | 2021-09-24 | 南京钢铁股份有限公司 | Low alloy steel and smelting method thereof |
| CN113957338A (en) * | 2021-10-09 | 2022-01-21 | 南京钢铁股份有限公司 | Magnesium-containing 45 steel and preparation process thereof |
| CN115232914B (en) * | 2022-05-16 | 2023-05-16 | 上海大学 | Method for improving modification effect of ship plate steel magnesium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368225A (en) * | 2008-09-28 | 2009-02-18 | 舞阳钢铁有限责任公司 | Smelting method for vulcanization easy cutting plastic mold steel |
| CN105671434A (en) * | 2016-03-19 | 2016-06-15 | 上海大学 | Magnesium, calcium and sulfur containing 20MnCr free-cutting gear steel and preparation method thereof |
| CN105779907A (en) * | 2016-03-19 | 2016-07-20 | 上海大学 | Free-cutting steel containing magnesium and calcium and production process |
| CN105803308A (en) * | 2016-03-19 | 2016-07-27 | 上海大学 | Magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and manufacturing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2934485B2 (en) * | 1990-07-30 | 1999-08-16 | 株式会社神戸製鋼所 | High-strength gear steel and high-strength gear that can be rapidly carburized |
-
2017
- 2017-09-15 CN CN201710829600.2A patent/CN107760824B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368225A (en) * | 2008-09-28 | 2009-02-18 | 舞阳钢铁有限责任公司 | Smelting method for vulcanization easy cutting plastic mold steel |
| CN105671434A (en) * | 2016-03-19 | 2016-06-15 | 上海大学 | Magnesium, calcium and sulfur containing 20MnCr free-cutting gear steel and preparation method thereof |
| CN105779907A (en) * | 2016-03-19 | 2016-07-20 | 上海大学 | Free-cutting steel containing magnesium and calcium and production process |
| CN105803308A (en) * | 2016-03-19 | 2016-07-27 | 上海大学 | Magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and manufacturing method thereof |
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