CN108660289A - Method for overcoming copper brittleness defect of copper-containing steel - Google Patents
Method for overcoming copper brittleness defect of copper-containing steel Download PDFInfo
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- CN108660289A CN108660289A CN201710196234.1A CN201710196234A CN108660289A CN 108660289 A CN108660289 A CN 108660289A CN 201710196234 A CN201710196234 A CN 201710196234A CN 108660289 A CN108660289 A CN 108660289A
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- 239000010959 steel Substances 0.000 title claims abstract description 135
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 134
- 239000010949 copper Substances 0.000 title claims abstract description 112
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 104
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000007547 defect Effects 0.000 title claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000007670 refining Methods 0.000 claims abstract description 28
- 238000005275 alloying Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 238000009749 continuous casting Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 229910004349 Ti-Al Inorganic materials 0.000 claims abstract description 9
- 229910004692 Ti—Al Inorganic materials 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 12
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 11
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 11
- 239000010936 titanium Substances 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 238000005204 segregation Methods 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000004512 die casting Methods 0.000 abstract 1
- 230000006911 nucleation Effects 0.000 abstract 1
- 238000010899 nucleation Methods 0.000 abstract 1
- 229910000870 Weathering steel Inorganic materials 0.000 description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000010813 municipal solid waste Substances 0.000 description 8
- 238000010079 rubber tapping Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 description 3
- 229910000863 Ferronickel Inorganic materials 0.000 description 3
- 238000003483 aging Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910018125 Al-Si Inorganic materials 0.000 description 2
- 229910018520 Al—Si Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 206010068052 Mosaicism Diseases 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910018054 Ni-Cu Inorganic materials 0.000 description 1
- 229910018481 Ni—Cu Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 210000003765 sex chromosome Anatomy 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for solving the copper brittleness defect of copper-containing steel, the process route is molten iron pretreatment, converter or electric furnace smelting, refining, continuous casting or die casting, rolling; the deoxidation and alloying process is controlled in the production process of the copper-containing steel, the dispersedly distributed Ti oxide inclusion containing MnS and Ti-Al composite oxide inclusion are generated in the steel as heterogeneous nucleation particles dispersed and precipitated by Cu, and the copper is precipitated on the MnS, so that the copper in the steel is uniformly and dispersedly distributed in the steel, is not easy to be segregated in a grain boundary, and the defect of copper brittleness of the copper-containing steel is eliminated. The method controls the precipitation of copper in the copper-containing steel by controlling the type, size and distribution of inclusions in the steel, and can fundamentally solve the copper brittleness defect of the copper-containing steel. The quality of the copper-containing steel is obviously improved, so that the method is beneficial to popularization and application.
Description
Technical field
The present invention relates to technical field of smelting, more particularly to a kind of method solving copper bearing steel copper brittleness defect.
Background technology
Copper is harmful element for most of steel grades, the cooling procedure of strand or the reheating of steel in the production of steel
Easily cause the hot-short of steel in crystal boundary segregation in the process.But copper is also beneficial alloying element, example for some special steel grades
Such as：A small amount of copper is usually added into corrosion resisting steel to improve the corrosion resistance of steel.Copper plays work in the corrosion process of steel
The effect for changing cathode, promotes anodic passivity and slows down corrosion.In addition, copper can be close between the corrosion layer and measuring copper layer of steel
Steel matrix forms fine and close, complete, adhesion is strong thin oxidation copper intermediate layer, slows down inside corrosive medium corrosion steel plate.But add
The copper bearing steel for entering copper alloy easily generates the crackle of polygon or the numb spot defect of dense distribution in production on the surface of steel,
I.e. usually said " copper brittleness defect ", seriously affects the surface quality of copper bearing steel, or even steel is caused to scrap.Therefore, copper bearing steel
Production be relatively difficult.
Certain technical measures, which are usually taken, when producing in copper bearing steel prevents the generation of copper brittleness defect, main method from having following several
Kind：First, with addition of nickel (Ni in copper bearing steel:Cu=1:3~1:2) copper-rich phase in steel, is made to become the copper that fusing point is more than 1200 DEG C
Nickel enrichment phase；Second is that reducing the relation reheating temperature before the rolling of copper bearing steel strand to 1100 DEG C hereinafter, reducing steel rolling temperature to copper
Fusing point (1083 DEG C) hereinafter, and reduce to the greatest extent inhomogeneous deformation and use smaller pass deformation；Third, by adjusting phase
The aggregate measures such as smelting, continuous casting and the hot-rolled heating technology control answered.Currently, enterprise is all made of these measures to prevent both at home and abroad
With decrease copper bearing steel copper brittleness defect.But there is of high cost, steel grade production technology limitation, appointed condition are limited (such as these methods
Hot Rolling Mill does not have the big pressure ability of low temperature) the shortcomings of, and these methods cannot fundamentally solve the copper of copper bearing steel
Crisp defect.Document paper " enrichment of Cu, Ni in copper-bearing age-hardening steel surface oxide layer " (《Steel》4th phase in 2007) in, it is situated between
Continued the enrichment discipline of Cu, Ni in copper-bearing age-hardening steel surface oxide layer.Ni is added in copper bearing steel, is changed rich in oxide layer
The structure of copper phase is promoted Ni-Cu enrichment phases and is retained in oxide layer with graininess, it is suppressed that infiltrations of the Cu into matrix, from
And improve the hot-short sex chromosome mosaicism of copper-bearing age-hardening steel.But that there are nickel alloys is expensive for this method, increases copper bearing steel production cost
The problems such as, therefore, this method is unfavorable for large-scale production and application；Document paper " grind by cupric hot rolled steel plate high temperature rapid firing technique
Study carefully " (《7th steel rolling annual meeting》2002) in, have studied the high temperature rapid firing technique for improving hot rolling cupric plate surface quality.Add
Thermal process uses reproducibility or neutrality atmosphere, accelerates heating rate, improves heating temperature, shortens heating time.By taking
The technique reduces selective oxidation, avoids critical-temperature as early as possible, slow down copper segregation.But this method must assure that sufficiently fast liter
Warm speed, technique are difficult to control, and to the more demanding of equipment, therefore application is restricted.
103320713 B of patent CN provide a kind of high-strength weathering steel and preparation method, and the invention is in traditional weathering steel
Ingredient in increase a variety of microalloy elements such as Al, Mo, V, Nb, B and carry out composite alloyings, reduce Cu, P in weathering steel and contain
Amount, eliminates Cu, P caused copper brittleness and the crisp harm of phosphorus in weathering steel, while improving the intensity and weather resistance of steel.The party
Copper brittleness defect caused by method reduces copper by reducing the content of Cu in steel, but cannot tackle the problem at its root.
103882315 A of patent CN provide a kind of manufacturing method of resistant to sulfuric acid dew point corrosion tandem rolling steel, mainly solve existing
Nickel is added to solve the technical problem that copper brittleness causes cost excessively high and high temperature rapid firing technique scene is uncontrollable.The invention is characterized in
Slab heating temperature ensures slab time inside furnace up to 180~260min to 1200 DEG C~1230 DEG C.This method is added using hot rolling
The adjustment of thermal process, and remove the method containing the iron scale that copper is precipitated in steel using breaking down dephosphorization water and eliminate cupric steel surface
Copper brittleness defect, it is thus impossible to tackle the problem at its root.
104694713 A of CN disclose a kind of cupric low-alloy steel heating means, and it is 2200 that slab, which enters after stove using calorific value,
~2300Kcal/Nm3140~160min of gas heating, last not more than 1070 DEG C of the outlet temperature of one section of control heating.Slab
Start to be rapidly heated for two sections into heating, by 40~50min, the last outlet temperature of two sections of control heating is less than tapping target temperature
25~30 DEG C.Soaking zone keeps the temperature 25~30min, and slab tapping temperature range is at 1220~1300 DEG C.The invention passes through heater
The control of skill, it is suppressed that the fusing of copper-rich layer crystal circle reduces measuring copper quantity, therefore, passes through normal roughing in slab
It when process, is easy to remove and is enriched in the subcutaneous copper of iron, without generating copper brittleness defect.But this method is complicated for operation, and technique is realized tired
It is difficult.
Invention content
Technical problem to be solved by the invention is to provide a kind of methods solving copper bearing steel copper brittleness defect, contain not changing
The existing production technology of copper steel under the premise of not increasing equipment investment, not increasing production process, solves copper bearing steel copper brittleness defect and asks
Topic.
To achieve the above object, the present invention is realized using following technical scheme：
A method of copper bearing steel copper brittleness defect being solved, process route is molten iron pretreatment, converter or electro-smelting, essence
Refining, continuous casting or molding, rolling；Deoxidation and alloying technique is controlled in the production process of copper bearing steel, and disperse point is generated in steel
The Ti oxides containing MnS of cloth are mingled with and Ti-Al composite oxides are mingled with the heterogeneous equiax crystal as Cu disperse educts, copper
It is precipitated on MnS, making the copper in steel, uniformly, be distributed in steel to Mass the copper brittleness for being not easy to eliminate copper bearing steel in crystal boundary segregation lacks
It falls into；It is as follows：
(1) the deoxidation and alloying technique of copper bearing steel molten steel includes mainly：Aluminium pre-deoxidation and alloying；Carburant, ferrosilicon,
Manganese-ferro deoxidation and alloying, ferrotianium and other alloy final deoxidizings and alloying；Before refining plus aluminium carries out component controlling, adds increasing
Carbon agent, ferrosilicon, ferromanganese carry out component controlling, and the refining later stage adds ferrotianium and other alloys to carry out final deoxidizing and alloying；
(2) plus before ferrotianium sulfur content controls between 0.010%~0.040% in molten steel；
(3) plus before ferrotianium oxygen activity is controlled in 150ppm or more in molten steel；
(4) molten steel needs 300~600s of calmness after refining treatment before continuous casting；
(5) molten steel continuous casting or when molding using the strong cold type of cooling；
(6) different according to steel grade, Ti, Al, Mn content in the molten steel ultimate constituent are controlled by the steel grade requirement upper limit.
First, pre-deoxidation and alloying that Al carries out molten steel are added in steel, make to generate a large amount of Al in steel2O3Field trash,
And make bulky grain Al2O3Field trash can have sufficient time floating to exclude.It more importantly can finally be obtained in steel a large amount of
, tiny Al2O3Field trash.
Then, carburant, ferrosilicon, ferromanganese is added, further deoxidation and alloying processing is carried out to molten steel.Control sulphur in steel
The purpose of content is：Make to generate a large amount of, tiny MnS field trashes in steel.
Finally, ferrotianium and other alloys are added into molten steel, final deoxidizing and alloying are carried out to molten steel, makes to generate in steel big
The titanium deoxidation products and titanium deoxidation products of amount and the Al formed before2O3The field trash knot of the formation such as field trash and ferrosilicon, ferromanganese
It closes, forms the complex deoxidizations product such as Ti-Al complex deoxidizations product and Ti-Al-Si.
The MnS field trashes generated in steel easily with the combined oxidations such as titanium oxide, Ti-Al composite oxides and Ti-Al-Si
Object combine, make the MnS field trashes generated in steel uniformly, be distributed in steel to Mass.And copper is easily precipitated on MnS, can make in this way
Copper in steel uniformly, be distributed in steel to Mass, is not easy to eliminate the copper brittleness defect of copper bearing steel in crystal boundary segregation.
The purpose of oxygen activity is before control plus titanium：Ensure that steel grade has enough oxygen to react with the ferrotianium being added, makes
The complex deoxidizations products such as a large amount of titanium deoxidation products and Ti-Al are generated in steel, a large amount of precipitations for MnS in steel provide effective shape
Nuclear particle.
The purpose of calm time is before control continuous casting：Ensure the bulky grain deoxidation products and folder that deoxidation alloying generates in steel
Sundries obtains adequately floating and exclude, and makes to obtain tiny, Dispersed precipitate field trash in steel.More importantly MnS is in titanyl
Precipitation of the precipitation and copper that compound is mingled with and the composite oxides such as Ti-Al are mingled on MnS has been required to the regular hour.
It is using the purpose of the strong cold type of cooling when molten steel continuous casting or molding：Control cooling velocity, make to generate in steel this
A little field trashes for being largely easy to copper precipitation can tiny, Dispersed precipitate in steel.Using generated in steel these are a large amount of, thin
Small, Dispersed precipitate titanium oxide is mingled with and the composite oxides such as Ti-Al are mingled with, and so that MnS is precipitated on it, and then promote
Copper is precipitated on it, and copper in steel is avoided to provide effective equiax crystal in crystal boundary segregation for the disperse educt of copper in steel.
Ti, Al, Mn play a key effect in the present invention.The key technology of the present invention be generated in steel it is a large amount of,
Tiny, Dispersed precipitate the Ti oxides containing MnS are mingled with and the composite oxides such as Ti-Al are mingled with as Cu disperse educts
Heterogeneous equiax crystal.Therefore the present invention claims to have certain Ti, Al, Mn content in steel.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention, by the Comprehensive Control of the processes such as steel-making, refining, continuous casting, makes in steel in the production process of copper bearing steel
Generate largely conducive to Cu be precipitated tiny, the equally distributed field trash of Mass, copper bearing steel strand cooling or rolling again
When heating, the copper in steel is made to be precipitated on field trash, avoids copper in crystal boundary segregation, reduce or eliminate copper brittleness defect.This method is logical
Cross the type to steel inclusion, size, distribution control, and then control copper bearing steel in copper precipitation, can fundamentally solve
Copper bearing steel copper brittleness defect.The quality of copper bearing steel is considerably improved, therefore conducive to popularization and application.
Specific implementation mode
With reference to embodiment, the present invention is further described：
The present invention will be described in detail for following embodiment.These embodiments be only to preferred embodiment of the invention into
Row description, does not limit the scope of the present invention.
Embodiment 1：
Certain weathering steel is smelted for refining equipments such as the 260 tons of converters of certain factory and LF stoves.Technological process is weather-proof by normally producing
Steel carries out, and is rolled using desulfurizing iron pretreatment → converter smelting → LF stoves refining → continuous casting → controlled rolling and controlled cooling.
[S] is 0.0080% after the preprocessed desulfurization of raw material molten iron.Then molten iron enters 260 tons of top and bottom combined blown converter smeltings
Refining, technique are carried out by normal Smelting Weathering Steel requirement.Converter terminal ingredient [S] mass percent is 0.0130%.Tapping process
Ferro-aluminum is added first into ladle and carries out pre-deoxidation and alloying, ferrosilicon is then added and ferromanganese carries out component controlling, together
When slag making materials are added into ladle.Ferro-aluminum, ferromanganese addition are controlled by the steel grade requirement upper limit.Ladle is carried out in tapping process
BOTTOM ARGON BLOWING, pressure are adjusted using ladle liquid level " bore hole " a diameter of 130~170mm as target.LF refining is by normal production weathering steel
Technique carries out.Ladle rear Argon, slag making operation in place.Used before LF refining terminates Determining oxygen probe measure steel in oxygen activity for
160ppm.Then final deoxidizing and alloying that ferrotianium, ferronickel, ferrochrome carry out molten steel is added.Ladle calmness 300s after refining.
Then use full guard continuous casting, in casting process under the premise of ensureing slab quality secondary cooling water using cold mode by force.It is finally right
The weathering steel strand of production carries out controlled rolling and controlled cooling rolling.
The final chemical composition of the weathering steel of the present embodiment is by weight percentage：C0.051、Si0.38、Mn1.10、
S0.0150, P0.0205, Al0.058, Cu0.33, Ti0.025, Ni0.17, Cr0.41, surplus Fe.
Quality inspection is carried out to the strand after continuous casting and the weather-proof steel product after Rolling Production, does not find that copper brittleness lacks
It falls into, i.e. edge, side crackle and surface fiber crops spot defect.
Embodiment 2：
Certain weathering steel is smelted for refining equipments such as the 260 tons of converters of certain factory and LF stoves.Technological process is weather-proof by normally producing
Steel carries out, and is rolled using desulfurizing iron pretreatment → converter smelting → LF stoves refining → continuous casting → controlled rolling and controlled cooling.
[S] is 0.0100% after the preprocessed desulfurization of raw material molten iron.Then molten iron enters 260 tons of top and bottom combined blown converter smeltings
Refining, technique are carried out by normal Smelting Weathering Steel requirement.Converter terminal ingredient [S] mass percent is 0.0150%.Tapping process
Ferro-aluminum is added first into ladle and carries out pre-deoxidation and alloying, ferrosilicon is then added and ferromanganese carries out component controlling, together
When slag making materials are added into ladle.Ferro-aluminum, ferromanganese addition are controlled by the steel grade requirement upper limit.Ladle is carried out in tapping process
BOTTOM ARGON BLOWING, pressure are adjusted using ladle liquid level " bore hole " a diameter of 130~170mm as target.LF refining is by normal production weathering steel
Technique carries out.Ladle rear Argon, slag making operation in place.Used before LF refining terminates Determining oxygen probe measure steel in oxygen activity for
200ppm.Then final deoxidizing and alloying that ferrotianium, ferronickel, ferrochrome carry out molten steel is added.Ladle calmness 450s after refining.
Then use full guard continuous casting, in casting process under the premise of ensureing slab quality secondary cooling water using cold mode by force.It is finally right
The weathering steel strand of production carries out controlled rolling and controlled cooling rolling.
The final chemical composition of the weathering steel of the present embodiment is by weight percentage：C0.055、Si0.35、Mn1.00、
S0.0174, P0.0180, Al0.059, Cu0.34, Ti0.018, Ni0.16, Cr0.43, surplus Fe.
Quality inspection is carried out to the strand after continuous casting and the weather-proof steel product after Rolling Production, does not find that copper brittleness lacks
It falls into, i.e. edge, side crackle and surface fiber crops spot defect.
Embodiment 3：
Certain weathering steel is smelted for refining equipments such as the 260 tons of converters of certain factory and LF stoves.Technological process is weather-proof by normally producing
Steel carries out, and is rolled using desulfurizing iron pretreatment → converter smelting → LF stoves refining → continuous casting → controlled rolling and controlled cooling.
[S] is 0.0120% after the preprocessed desulfurization of raw material molten iron.Then molten iron enters 260 tons of top and bottom combined blown converter smeltings
Refining, technique are carried out by normal Smelting Weathering Steel requirement.Converter terminal ingredient [S] mass percent is 0.0175%.Tapping process
Ferro-aluminum is added first into ladle and carries out pre-deoxidation and alloying, ferrosilicon is then added and ferromanganese carries out component controlling, together
When slag making materials are added into ladle.Ferro-aluminum, ferromanganese addition are controlled by the steel grade requirement upper limit.Ladle is carried out in tapping process
BOTTOM ARGON BLOWING, pressure are adjusted using ladle liquid level " bore hole " a diameter of 130~170mm as target.LF refining is by normal production weathering steel
Technique carries out.Ladle rear Argon, slag making operation in place.Used before LF refining terminates Determining oxygen probe measure steel in oxygen activity for
221ppm.Then final deoxidizing and alloying that ferrotianium, ferronickel, ferrochrome carry out molten steel is added.Ladle calmness 600s after refining.
Then use full guard continuous casting, in casting process under the premise of ensureing slab quality secondary cooling water using cold mode by force.It is finally right
The weathering steel strand of production carries out controlled rolling and controlled cooling rolling.
The final chemical composition of the weathering steel of the present embodiment is by weight percentage：C0.061、Si0.44、Mn0.99、
S0.0218, P0.0186, Al0.064, Cu0.35, Ti0.026, Ni0.19, Cr0.40, surplus Fe.
Quality inspection is carried out to the strand after continuous casting and the weather-proof steel product after Rolling Production, does not find that copper brittleness lacks
It falls into, i.e. edge, side crackle and surface fiber crops spot defect.
Claims (1)
1. a kind of method solving copper bearing steel copper brittleness defect, process route be molten iron pretreatment, converter or electro-smelting, refining,
Continuous casting or molding, rolling；It is characterized in that, controlling deoxidation and alloying technique in the production process of copper bearing steel, produced in steel
The Ti oxides containing MnS of raw Dispersed precipitate are mingled with and Ti-Al composite oxides are mingled with the heterogeneous shape as Cu disperse educts
Nuclear particle, copper are precipitated on MnS, and the copper in steel is made uniformly, be distributed in steel to Mass not in crystal boundary segregation, to eliminate copper bearing steel
Copper brittleness defect；It is as follows：
(1) the deoxidation and alloying technique of copper bearing steel molten steel includes mainly：Aluminium pre-deoxidation and alloying；Carburant, ferrosilicon, ferromanganese
Component controlling, ferrotianium and other alloy final deoxidizings and alloying；Before refining plus aluminium carries out component controlling, adds carburetting
Agent, ferrosilicon, ferromanganese carry out component controlling, and the refining later stage adds ferrotianium and other alloys to carry out final deoxidizing and alloying；
(2) plus before ferrotianium sulfur content controls between 0.010%~0.040% in molten steel；
(3) plus before ferrotianium oxygen activity is controlled in 150ppm or more in molten steel；
(4) molten steel needs 300~600s of calmness after refining treatment before continuous casting；
(5) molten steel continuous casting or when molding using the strong cold type of cooling；
(6) different according to steel grade, Ti, Al, Mn content in the molten steel ultimate constituent are controlled by the steel grade requirement upper limit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113025925A (en) * | 2021-03-10 | 2021-06-25 | 安阳钢铁股份有限公司 | Production method of nickel-free steel for resisting sulfuric acid dew point corrosion |
| CN115608780A (en) * | 2022-12-19 | 2023-01-17 | 太原科技大学 | Method for controlling copper-containing stainless steel cracks and stainless steel |
| CN115652212A (en) * | 2022-11-09 | 2023-01-31 | 江苏联峰实业有限公司 | Low-carbon copper-containing steel and production process for improving surface quality of low-carbon copper-containing steel |
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| CN1427088A (en) * | 2001-11-28 | 2003-07-02 | 大同特殊钢株式会社 | Steel with good cutting and cutting breaking performance for physical construction |
| CN102102138A (en) * | 2009-12-22 | 2011-06-22 | 鞍钢股份有限公司 | Method for solving copper segregation in steel |
| CN103643157A (en) * | 2013-11-26 | 2014-03-19 | 攀钢集团江油长城特殊钢有限公司 | Copper-contained ferritic stainless steel coil and manufacturing method thereof |
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| CN1427088A (en) * | 2001-11-28 | 2003-07-02 | 大同特殊钢株式会社 | Steel with good cutting and cutting breaking performance for physical construction |
| CN102102138A (en) * | 2009-12-22 | 2011-06-22 | 鞍钢股份有限公司 | Method for solving copper segregation in steel |
| CN103643157A (en) * | 2013-11-26 | 2014-03-19 | 攀钢集团江油长城特殊钢有限公司 | Copper-contained ferritic stainless steel coil and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113025925A (en) * | 2021-03-10 | 2021-06-25 | 安阳钢铁股份有限公司 | Production method of nickel-free steel for resisting sulfuric acid dew point corrosion |
| CN115652212A (en) * | 2022-11-09 | 2023-01-31 | 江苏联峰实业有限公司 | Low-carbon copper-containing steel and production process for improving surface quality of low-carbon copper-containing steel |
| CN115608780A (en) * | 2022-12-19 | 2023-01-17 | 太原科技大学 | Method for controlling copper-containing stainless steel cracks and stainless steel |
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Application publication date: 20181016 |