CN1912148A - Iron and steel metallurgical compound refining agent - Google Patents
Iron and steel metallurgical compound refining agent Download PDFInfo
- Publication number
- CN1912148A CN1912148A CN 200610052792 CN200610052792A CN1912148A CN 1912148 A CN1912148 A CN 1912148A CN 200610052792 CN200610052792 CN 200610052792 CN 200610052792 A CN200610052792 A CN 200610052792A CN 1912148 A CN1912148 A CN 1912148A
- Authority
- CN
- China
- Prior art keywords
- refining agent
- raw material
- steel
- iron
- rare earth
- 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.)
- Granted
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to ferrous metallurgy compound refining agent. The TL refining agent material weight percentage is as follows: Ca-Si 28-36%, CaF2 20-40%, manganese metal powder 30-45%, and rare earth 0-4%. The TB refining agent is as follows: CaO 20-60%, BaO 16-30%, CaF2 6-20%, MgO 6-18%, NaAIF6 0-6%, NaSiF6 0-16%, and rare earth 0-6%. The refining agent can be gained by smashing, mixing, filtering, and drying, adjust Si/Mn weight percentage to increase deoxidizing effect, replace CaO by BaO to increase dephosphorizing effect, add certain rare earth to improve Ca utilization factor. It can be used in the deoxidizing, degassing, dephosphorizing, desulfurizing for straight carbon steel, low carbon steel, ultra-low micro carbon steel.
Description
Technical field
The present invention relates to a kind of metallurgical refiner, thereby reach the iron and steel metallurgical compound refining agent that deoxidation, desulfurization, dephosphorization improve the purity of steel during particularly a kind of refining liquid steel.
Background technology
At present, during Small and Medium Enterprises in China steel-making, deoxidation is mainly adopted interpolation to wait as aluminium wire, ferro-silicon, manganeseirom and is finished; The refining material that domestic iron and steel enterprises is used mainly contains commercial-purity aluminium, aluminium ferrosilicon, silicon barium ferro-aluminum etc.The control of aluminium content is improper, be very easy to cause the aluminium content overproof, mechanical property to steel, particularly the toughness influence is very big, development and progress along with steel-smelting technology, for further improving the performance of component, deoxidation process more uses composite refiner, and kind surplus the domestic composite refiner of finding 40 is binary, ternary, quaternary system mostly at present, but really only 4～5 kinds of large usage quantity, use more composite refiner, majority is FeAlSi, FeAlBaSi etc., and add-on is bigger than normal, cost is higher, and deoxidation, sulphur effect improve.
In recent years, aspect raising metallurgic product performance study, emphasize control day by day both at home and abroad to gas in the molten steel and non-metallic inclusion.Studies show that the raising of molten steel purity will directly improve the mechanical property, particularly toughness of foundry goods.Sweden has developed steel teeming ladle injection refining method, utilizes rare gas element or carrier, with powdered refining agent (Ca-Si, CaC
2CaO) by inserting the spray gun in the molten steel, in molten steel, dust, this method has the ability of good desulfurization, degasification and elimination inclusion, required equipment is simple, and the production operation expense is cheap, and metallurgical effect is remarkable, use this kind technology and can adopt high-carbon and medium carbon ferrochrome to replace expensive extra low carbon ferrochromium, metallurgical cost can significantly reduce.NKK, employing steel spraying powders such as Nippon Steel and second Steel Plant of Japanese Fushan system steel institute combine with other refining means, having produced sulphur content is the following ultrapure steel of 20ppm, Sweden MFFOS uses the blowing process refining liquid steel in induction furnace, its the highest dephosphorization amount can reach 36%, China Ministry of Metallurgical Industry steel grinds total institute and has carried out powder dephosphorization, sulfur test in 1985, carries out industrial-scale pilot on 5 tons electric furnace, uses CaC
2+ CaSi mixing powder plays dephosphorization, sulphur effect, grinds the test-results of total institute according to Ministry of Metallurgical Industry's steel, and CaC jets in stainless steel
2, CaSi, CaC
2Behind the pulvis such as+CaSi, but except dephosphorization, sulphur, oxygen and nitrogen, also can remove trace harmful elements such as As, Sb, Sn and Pb.People such as Japan Karue add CaC in ladle furnace
2Pulvis, when the carbon content of carbon steel molten steel less than 0.2% the time, the removal degree of each trace harmful element can reach more than 30%.But, for medium-sized and small enterprises, adopt processing unit conditions such as dusting, feed silk not possess.The smelter that domestic great majority have the following all kinds of smelting equipments of 5T (comprising 5T) does not still have external refining equipment, particularly medium-frequency induction furnace, can't carry out refining treatment.
Document [1] " refining agent for stainless steel researchdevelopment present situation both at home and abroad ", foundry engieering, 2003,24 (2) .80-82, introduced the researchdevelopment present situation of domestic and international refining agent for stainless steel, analyzed the ability to function of each constituent element element of refining agent, discuss and summed up the compound action of refining agent constituent element, generally select rare earth, alkaline-earth metal (barium, calcium and magnesium) etc. as major components to the stainless steel refining, they not only have very strong deoxidizing capacity, also with molten steel in sulphur, nitrogen and other impurity elements very strong deoxidizing capacity is arranged.Document [2] " research of high purity copper NEW TYPE OF COMPOSITE refining agent CBMR ", Dalian University of Technology's journal, 1995,35 (6) .824-827, introduced a kind of Cu of containing of Dalian University of Technology's exploitation, B, Mg, Ce, the high purity copper novel rare-earth composite refiner CBMR of elements such as rare earth, study its refining effect and refining product thereof and removed mechanism, the result shows, CBMR has dehydrogenation simultaneously, oxygen, the triple role of sulphur, and the refining product is easy to come-up and removes, the removal mechanism of refining product is that a kind of low-melting compound Mg O.B202 is produced in reaction, thereby is easy to polymerization, come-up, remove.Document [3] " composite refiner is to improving the effect of stainless steel mechanical property and corrosion resistance nature ", HUST's journal 1995,23 (1) .113-116, the author has studied the effect of Si-Ba-Re-Ca-Mg composite refiner to 1Cr18Ni9Ti stainless steel mechanical property and corrosion resisting property, determine the optimal components (3%-8%Ba of refining agent with optimum seeking method, 5%-8%RE, 3%-5%Ca, 0%-1.5Mg, all the other are Si), analyzed the quantity of each constituent element of refining agent to non-metallic inclusion, size, the influence of distribution and form finds that Ba is the most effective to improving erosion resistance, and RE takes second place; Mg has special role to stablizing the stainless steel performance; Ca improves erosion resistance and unit elongation slightly.Document [4] " application of wire-feeding technique in the cast steel melting ", heat processing technique, 2003 (3) .43-45, the author has studied many Yuans composite refiners such as a kind of calcic, barium, rare earth, magnesium, by adopting cored-wire line feeding art breading stainless steel, many Yuans compound effects are better than the effect of single alloy.In a word, the domestic existing research of rare earth composite refiner is at present reported.But employed equipment is bigger, is applicable to the alkaline stove that investment is bigger.At medium-sized and small enterprises use medium-frequency induction furnace, how with CaSi, CaF
2, pulvis such as BaO carries out the reasonable component proportioning, and add the proper amount of rare-earth element on this basis and make the novel rare-earth composite refiner of 0.8～3.0mm and do not see that in above-mentioned range of search document clearly addresses.
Summary of the invention
The objective of the invention is to by rational proportioning components, propose a kind of be suitable for that medium-frequency induction furnace that medium-sized and small enterprises use investment to economize refines, have better deoxidation, sweetening effectiveness, improve the iron and steel metallurgical compound refining agent (TL refining agent) of inclusion morphology; A kind of another kind of iron and steel metallurgical compound refining agent (TB refining agent) that has better desulfurization, dephosphorization effect, improves inclusion morphology is proposed simultaneously.
Purpose of the present invention realizes by following technical proposal: a kind of iron and steel metallurgical compound refining agent is characterized in that the weight percent of the raw material of described refining agent is:
Ca-Si 28～36％
CaF
2 20～40％
Manganese powder 30～45%
Rare earth 0～4%
By above-mentioned composition prescription through preparation technology: broken-as to mix-sieve-drying makes composite refiner.
A kind of iron and steel metallurgical compound refining agent is characterized in that the weight percent of the raw material of described refining agent:
CaO 20～60％
BaO 16～30％
CaF
2 6～20％
MgO 6～18％
NaAlF
6 0～6％
NaSiF
6 0～16％
Rare earth 0～6%
By above-mentioned composition prescription through preparation technology: broken-as to mix-sieve-drying makes composite refiner.
Described preparation technology:
(1) fragmentation: the particle that each raw material is broken into 10～30mm respectively with crusher;
(2) mix: each raw material that fragmentation is good mixes by the prescription requirement, and mixes with ball mill;
(3) sieve: the raw material that mixes is sieved with 100 eye mesh screens;
(4) drying: the raw material after will sieving is placed in the baking oven and toasts, and removes moisture, and storing temperature is 80～120 ℃, according to the volatilization extent control storing time of moisture.
Compared with prior art, the present invention by regulating the utilization ratio of Si/Mn weight percent and increase Ca, makes the more stable complex deoxidization product of generation on the prescription of TL refining agent, improved deoxidation and sweetening effectiveness; On TB refining agent prescription composition,, improved kinetics, the thermodynamic condition of dephosphorization, improved the dephosphorization effect of intermediate frequency furnace with BaO replaced C aO; Add a certain proportion of rare earth simultaneously in the composition of two kinds of schemes, utilize remaining rare earth to improve the microtexture of material, crystal grain thinning has improved the inclusion morphology of molten steel inside simultaneously, improves the every mechanical property of product greatly.Present device investment is lower, is suitable for middle-size and small-size precision casting enterprise, makes these enterprises under no external refining equipment condition, reaches refining liquid steel, improves the purity of steel, thereby further improves the quality of products, raising home products competitive power.Experiment showed, the subordinate list 1～6 after the deoxidation, desulfurization, the dephosphorization rate that add respectively behind TL refining agent and the TB refining agent see embodiment for details, the contrast grading figure of sample macrostructure sees Fig. 2～Fig. 3.
Description of drawings
Fig. 1 adds site plan for adopting in the TL refining agent furnace.
Fig. 2 is that embodiment 1 adds the figure of the reacted sample of TL refining agent macrostructure.
Fig. 3 is not for adding the figure of the reacted sample of TL refining agent macrostructure.
Fig. 4 adds site plan for adopting in the TB refining agent ladle.
Embodiment
Refining agent provided by the invention has TL deoxidation, desulfurization composite refiner and TB desulfurization, dephosphorization refining agent, can adopt general method to mix, the TL refining agent adopts the A place of Fig. 1 to carry out refining treatment with the mode that stove adds, and also can carry out refining treatment as the B place ladle adding mode of Fig. 4.And the TB refining agent can only adopt the B place ladle adding mode of Fig. 4 to carry out refining treatment.
Its Manufacture Of Iron And Steel By Melting step has with different using method:
(1) melting → add TL refining agent → slag making, skim → tap → pour into a mould with stove
(2) melting → tapping → ladle adds TB refining agent → slag making, skims → pour into a mould
Using method:
(1) with the stove addition method
At the smelting initial stage, the TL refining agent is added in the stove with furnace charge, make refining agent and furnace charge thorough mixing, help the augmenting response area, this method is simple, is specially adapted to medium-frequency induction furnace.
(2) pour method
Before the tapping, the TB refining agent is directly put into the bag end, impact stirring by pouring molten steel flow, be applicable to the ladle of 0.5T, 1.0T, the reaction times needs 4min.
(3) feed the silk method
Be applicable to the various smelting furnaces of 2～5T type of furnace, in the form feeding molten steel of refining agent with silk, this method reaction fullest, refining effect can more be given full play of, and is applicable to that industrial scale is bigger, does not still have the smelter of external refining, need purchase wire feeder.
The raw material weight per-cent of embodiment 1:TL refining agent:
Ca-Si:32%, CaF
2: 20%, manganese powder: 45%, rare earth: 3%.
Preparation technology comprises:
(1) fragmentation: the particle that each raw material is broken into 10～30mm respectively with crusher;
(2) mix: each raw material that fragmentation is good carries out the ball mill uniform mixing;
(3) sieve: with 100 eye mesh screens the raw material that mixes is sieved, the control powder size is at 0.2～2.0mm;
(4) drying: the raw material that will sieve is packed into and is toasted in the baking oven, removes moisture, and 80～120 ℃ of storing temperatures according to the volatilization extent control storing time of moisture, are generally overflowed and are as the criterion to estimate not water breakthrough steam.
Adopt the IT medium-frequency induction furnace to smelt plain carbon stool, add-on is respectively 0.375%, 0.5%, 1.0% of molten steel weight, adds the implantation site in the stove by Figure 1A place, and test-results sees Table 1:
Deoxidation behind the table 1 adding TL refining agent, sulphur rate
| The deoxidation rate | Desulfurization degree | |
| Add 0.375%TL and add 0.5%TL adding 1.0%TL | 32.6％ 47.9％ 57.7％ | 16％ 20％ 20％ |
Sample is made standard low power sample, carry out macrostructure's observation.There is the axle center intercrystalline fracture to add in the reacted sample of 0.375% refining agent, comments to such an extent that this sample axle center intercrystalline fracture is 2 grades according to GB/T1979-2001 " structure iron macrostructure defective grading figure ", 2 grades of General Loosen.Pattern is seen shown in Figure 2.Do not add that to exist a large amount of pores to see in the sample of refining agent reaction shown in Figure 3.
The raw material weight per-cent of embodiment 2:TL refining agent:
Ca-Si:30%, CaF
2: 20%, manganese powder: 45%, rare earth: 2%.
Preparation technology is with embodiment 1.
Adopting thickness is the steel band of 0.35mm, is bundled into the cored-wire of ￠ 10mm, and core agent weight is 120g/m, in the 500Kg medium-frequency induction furnace, smelt straight carbon steel, wire-feeding velocity with 2.4～3.0m/min feeds cored-wire in the stove, and cored-wire adds according to 0.375% of molten steel weight, the results are shown in Table 2:
Table 2 adds TL refining agent, wire feeding process test-results
| Heat (batch) number | Content of the test | [0] | The deoxidation rate |
| I | Original molten steel adopts and feeds the deoxidation silk in the stove | 0.015 0.0075 | 50％ |
The raw material weight per-cent of embodiment 3:TL refining agent:
Ca-Si:32%, CaF
2: 20%, manganese powder: 45%, rare earth: 0%.
Preparation technology is with embodiment 1.
In the 1.0% B place ladle that adds as Fig. 4 according to molten steel weight, the results are shown in Table 3:
Table 3 adds the TL refining agent, ladle adds the technological test result
| Heat (batch) number | The steel Bale No. | Content of the test | [0] | The deoxidation rate |
| I | 1 | Add reductor before the pouring molten steel in the ladle and carry out deep deoxidation | 0.0123 0.0091 | 26％ |
The raw material weight per-cent of embodiment 4:TB refining agent:
CaO 40%, and BaO 20%, CaF
210%, MgO 10%, NaAIF
65%, NaSiF
610%, rare earth 5%.
Preparation technology is with embodiment 1.
Adopt the 2T medium-frequency induction furnace to smelt 200 series stainless steels, add-on is respectively 0.8% of molten steel weight, and refining agent powder art adds point control in position, Fig. 4 B place, and carries out at ladle bottom winding-up argon gas driving a reaction.It the results are shown in Table 4:
Table 4 adds TB refining agent test-results
| Dephosphorization rate | Desulfurization degree | |
| The TB refining agent | 42％ | 87％ |
This embodiment is after adding the refining agent processing, the rolling broken limit phenomenon of 200 series stainless steels is greatly improved, do not carry out the microtexture analysis with adding refining agent material of handling that broken limit phenomenon is arranged and the material that adds the refining agent processing under the same heat condition, the non-metallic inclusion rank of 1#, 2# sample is 1# (broken limit): A (sulfide-based) I level, 2.5 grades of 2#:A (sulfide-based).
By being observed, the 1#, the 2# sample that do not add TB refining agent, adding TB refining agent find, it is lower to add behind the refining agent in the steel sulphide grade, the form of inclusion is by the spherical strip and block that becomes after the hot rolling, therefore think under the desulfidation of refining agent that sulphur content reduces makes the quantity of sulfide inclusion obviously reduce.
And do not add being mixed in after the hot rolling of 1# sample that the TB refining agent has broken limit still for block, and because inclusion is not easy distortion, under the rolling load effect, there is tangible micro-flaw, produce broken limit phenomenon.Therefore, Xiang Gangzhong adds the rare earth composite refiner, and the character of the nonmetal inclusion in the steel is changed, and sulfide inclusion becomes heterogenetic plasticity and is mingled with, and helps distortion.The distortion of inclusion has weakened hot-rolled sheet and has produced the possibility on broken limit in the operation of rolling.
The raw material weight per-cent of embodiment 5:TB refining agent:
CaO 20%, and BaO 30%, CaF
215%, MgO 17%, NaAIF
65%, NaSiF
610%, rare earth 3%.
Preparation technology is with embodiment 1.
Adopting thickness is the steel band of 0.35mm, be bundled into the cored-wire of ￠ 10mm, core agent weight is 120g/m, smelts straight carbon steel in the 500Kg medium-frequency induction furnace, wire-feeding velocity with 2.4～3.0m/min feeds cored-wire in the ladle, and cored-wire adds according to 0.5% of molten steel weight.The results are shown in Table 5:
Table 5 adds wire feeding process test-results in TB refining agent, the ladle
| Heat (batch) number | The steel Bale No. | Content of the test | [0] | The deoxidation rate |
| I | 3 | Original molten steel adopts and feeds the desulfurization silk in the ladle | 0.026 0.016 | 38.4％ |
The raw material weight per-cent of embodiment 6:TB refining agent:
CaO 40%, and BaO 30%, CaF
220%, MgO 8%, and other is 2% years old.
(illustrate: other 2% can be NaAIF
6, NaSiF
6, three kinds of raw materials of rare earth arbitrary combination or single composition).
Preparation technology is with embodiment 1.
This scheme is smelted plain carbon stool in the 1T medium-frequency induction furnace, the position that TB refining agent powder adds adds the implantation site for Fig. 4 ladle B place, and test-results is shown in Table 6:
Table 6 adds TB refining agent test-results
| Dephosphorization rate | Desulfurization degree |
| 28.5％ | 32％ |
Claims (4)
1, a kind of iron and steel metallurgical compound refining agent is characterized in that the weight percent of the raw material of described refining agent is:
Ca-Si 28～36％
CaF
2 20～40％
Manganese powder 30～45%
Rare earth 0～4%
By above-mentioned composition prescription through preparation technology: broken-as to mix-sieve-drying makes composite refiner.
2, a kind of iron and steel metallurgical compound refining agent is characterized in that the weight percent of the raw material of described refining agent:
CaO 20～60％
BaO 16～30％
CaF
2 6～20％
MgO 6～18％
NaAIF
6 0～6％
NaSiF
6 0～16％
Rare earth 0～6%
By above-mentioned composition prescription through preparation technology: broken-as to mix-sieve-drying makes composite refiner.
3, iron and steel metallurgical compound refining agent according to claim 1 is characterized in that described preparation technology:
(1) fragmentation: the particle that each raw material is broken into 10～30mm respectively with crusher;
(2) mix: each raw material that fragmentation is good mixes by the prescription requirement, and mixes with ball mill;
(3) sieve: the raw material that mixes is sieved with 100 eye mesh screens;
(4) drying: the raw material after will sieving is placed in the baking oven and toasts, and removes moisture, and storing temperature is 80～120 ℃, according to the volatilization extent control storing time of moisture.
4, iron and steel metallurgical compound refining agent according to claim 2 is characterized in that described preparation technology:
(1) fragmentation: the particle that each raw material is broken into 10～30mm respectively with crusher;
(2) mix: each raw material that fragmentation is good mixes by the prescription requirement, and mixes with ball mill;
(3) sieve: the raw material that mixes is sieved with 100 eye mesh screens;
(4) drying: the raw material after will sieving is placed in the baking oven and toasts, and removes moisture, and storing temperature is 80～120 ℃, according to the volatilization extent control storing time of moisture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100527922A CN100535132C (en) | 2006-08-01 | 2006-08-01 | Iron and steel metallurgical compound refining agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100527922A CN100535132C (en) | 2006-08-01 | 2006-08-01 | Iron and steel metallurgical compound refining agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1912148A true CN1912148A (en) | 2007-02-14 |
| CN100535132C CN100535132C (en) | 2009-09-02 |
Family
ID=37721202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100527922A Expired - Fee Related CN100535132C (en) | 2006-08-01 | 2006-08-01 | Iron and steel metallurgical compound refining agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100535132C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353750B (en) * | 2007-07-23 | 2010-11-03 | 宝山钢铁股份有限公司 | Refining method by in situ extraction of inclusion content in melting steel |
| CN102041351A (en) * | 2010-11-07 | 2011-05-04 | 山西太钢不锈钢股份有限公司 | Slag conditioning method for refining chromium-nickel austenite stainless steel with argon-oxygen furnace |
| CN103642980A (en) * | 2013-12-10 | 2014-03-19 | 广西博士海意信息科技有限公司 | Refining agent for steel-making |
| CN112322841A (en) * | 2020-10-22 | 2021-02-05 | 阳新金晟贸易有限公司 | Industrial fluxing agent and preparation method thereof |
| CN113061689A (en) * | 2021-03-24 | 2021-07-02 | 宁夏科通新材料科技有限公司 | Method for preparing silicon-calcium-barium-aluminum alloy from ore raw material |
-
2006
- 2006-08-01 CN CNB2006100527922A patent/CN100535132C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353750B (en) * | 2007-07-23 | 2010-11-03 | 宝山钢铁股份有限公司 | Refining method by in situ extraction of inclusion content in melting steel |
| CN102041351A (en) * | 2010-11-07 | 2011-05-04 | 山西太钢不锈钢股份有限公司 | Slag conditioning method for refining chromium-nickel austenite stainless steel with argon-oxygen furnace |
| CN102041351B (en) * | 2010-11-07 | 2012-10-03 | 山西太钢不锈钢股份有限公司 | Slag conditioning method for refining chromium-nickel austenite stainless steel with argon-oxygen furnace |
| CN103642980A (en) * | 2013-12-10 | 2014-03-19 | 广西博士海意信息科技有限公司 | Refining agent for steel-making |
| CN112322841A (en) * | 2020-10-22 | 2021-02-05 | 阳新金晟贸易有限公司 | Industrial fluxing agent and preparation method thereof |
| CN113061689A (en) * | 2021-03-24 | 2021-07-02 | 宁夏科通新材料科技有限公司 | Method for preparing silicon-calcium-barium-aluminum alloy from ore raw material |
| CN113061689B (en) * | 2021-03-24 | 2022-05-17 | 宁夏科通新材料科技有限公司 | Method for preparing silicon-calcium-barium-aluminum alloy from ore raw material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100535132C (en) | 2009-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101643867B (en) | High performance copper casting alloy and preparation method thereof | |
| CN103484749B (en) | A kind of nodular cast iron inoculant and preparation method thereof and the application in nodular cast iron smelting | |
| CN102796947A (en) | High-grade non-oriented silicon steel with excellent magnetism and smelting method for high-grade non-oriented silicon steel | |
| CN101041878A (en) | Low-manganese low- sulfur raw material ferroferrite for amorphous usage and method of production | |
| CN109825762A (en) | A kind of high-speed high-performance bearing steel and preparation method thereof | |
| CN101979672A (en) | Method for ultra-deeply dephosphorizing in steel ladle | |
| CN101135021B (en) | Aluminium magnesium ferroalloy for molten steel deoxidization desulfuration and alloying and preparation method thereof | |
| KR20140121452A (en) | Process for producing low-cost clean steel | |
| CN1912148A (en) | Iron and steel metallurgical compound refining agent | |
| CN101812568B (en) | Kalzium metal for deoxidization during steel making | |
| CN101665858A (en) | Steel ladle slag modifier for external refining | |
| CN1818094A (en) | Steel liquid cleaner for steel smelting | |
| CN113005261A (en) | Comprehensive deoxidation and desulfurization process for smelting stainless steel by using small-capacity AOD furnace | |
| CN116694865A (en) | Refining slag suitable for silicon-killed steel ladle desulfurization and use method thereof | |
| CN108315647B (en) | Grinding ball steel material and preparation method thereof | |
| CN102747191B (en) | Molten steel desulfurizer | |
| CN104862451A (en) | Method for applying nano molten iron purifying modificator to austenitic ductile iron cast ball | |
| CN102102138B (en) | Method for solving copper segregation in steel | |
| CN114737022A (en) | Environment-friendly smokeless molten steel refining agent and preparation method thereof | |
| CN102766801A (en) | Rare earth Al-Ca-Fe alloy for rare earth micro-treated steel and preparation method thereof | |
| CN1083891C (en) | Si-Ba-Mg-Fe alloy for deoxidizing in smelting steel | |
| CN1141347A (en) | Multi-element alloy for deoxidising molten steel and alloying thereof | |
| RU2456349C1 (en) | Procedure for out-of-furnace treatment of iron-carbon melt | |
| CN100412215C (en) | Copper-nickel-silicon-ferroalloy | |
| CN110453040A (en) | A kind of alumal deoxidier and its deoxidation in steel making method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090902 Termination date: 20170801 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |