CN105671238A - Modification method for cold-rolled sheet steel slag - Google Patents
Modification method for cold-rolled sheet steel slag Download PDFInfo
- Publication number
- CN105671238A CN105671238A CN201610076772.2A CN201610076772A CN105671238A CN 105671238 A CN105671238 A CN 105671238A CN 201610076772 A CN201610076772 A CN 201610076772A CN 105671238 A CN105671238 A CN 105671238A
- Authority
- CN
- China
- Prior art keywords
- modification agent
- slag
- base modification
- rolled sheet
- addition
- 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
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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
Abstract
The invention discloses a modification method for cold-rolled sheet steel slag. The modification method comprises the following steps: when converter tapping is over, adding an Al-based modifier into a ladle to deoxidize the steel slag; and after RH refining is over, adding the Al-based modifier again to deoxidize the steel slag. In the step of adding the Al-based modifier again to deoxidize the steel slag after RH refining is over, the corresponding relationship between the adding amount of the Al-based modifier and a heating oxygen blowing amount is as follows: when the heating oxygen blowing amount is less than 0.3 m<3>/t, the adding amount of the Al-based modifier is 0.3 kg/t; when the heating oxygen blowing amount is 0.3-0.8 m<3>/t, the adding amount of the Al-based modifier is 0.3-0.8 kg/t; and when the heating oxygen blowing amount is greater than 0.8 m<3>/t, the adding amount of the Al-based modifier is 0.8-1.0 kg/t. According to the modification method,the problem of unstable deoxidation modification of steel slag in the prior artissolved, the quantity of non-metallic inclusions in steel is reduced, and the purity of molten steel and the surface quality of a cold-rolled sheet are improved.
Description
Technical field
The present invention relates to steelmaking technical field, particularly relate to the method for modifying of a kind of flat cold-rolled sheet slag.
Background technology
Cold rolled sheet steel is widely used in the fields such as automobile and household electrical appliances. Flat cold-rolled sheet steel grade is due to through cold rolling process, and its product specification is generally relatively thin (< 2mm). Except requiring excellent mechanical performances, also require that steel plate has excellent surface quality. In recent years, the surface quality requirements of flat cold-rolled sheet especially automobile exterior panel is close to harshness by downstream client, even requires " zero-fault ". And the large scale non-metallic inclusion in steel plate, if cluster shape aluminium oxide is the main cause causing these surface defects, therefore controls large-sized inclusions in Cleanliness of Molten Steel minimizing steel and be always up the unremitting pursuit of metallargist.
Research shows that the field trash in cold rolled sheet steel is except, except deoxidation products, being also from the ladle top slag oxidation to molten steel. In slag, unstable oxide is (such as FetO, MnO) easily reduced by the Al in molten steel, general by " FetO+MnO " content is as the index of slag oxidisability. " FetO+MnO " content is both content sums, cold rolled sheet steel finished product carbon content is generally less than 0.05%, therefore be deep decarburization or saves cost, a lot of enterprises employing BOF-RH-CC explained hereafter. Such steel grade especially ultra-low-carbon steel needs in refining stage decarburization, therefore in the converter tapping stage not to deoxidation of molten steel, causes that slag oxidisability is stronger. After follow-up refining process is to deoxidation of molten steel, the strong oxidizing property constituent element of slag can continue toward molten steel oxygen supply, harm Cleanliness of Molten Steel and flat cold-rolled sheet surface quality. Therefore, the oxidisability of flat cold-rolled sheet slag need to be carried out control.
Prior art is added after converter terminates by the steel slag modification agent provided containing Al, but production practical application finding, this technology exists slag oxidisability after upgrading and controls unstable problem, RH terminate after due to slag harder, therefore how to add modification agent and be also rapidly a difficult problem to slag deoxidation.
Summary of the invention
It is an object of the invention to provide the method for modifying of a kind of flat cold-rolled sheet slag, solve slag oxidisability after applying modification agent upgrading in prior art and control unstable problem.
The embodiment of the present invention passes through to provide the method for modifying of a kind of flat cold-rolled sheet slag, including:
In ladle, Al base modification agent is added to slag deoxidation when converter tapping terminates;
RH refine adds described Al base modification agent again to described slag deoxidation after terminating;
Wherein, again adding in the described Al base modification agent step to described slag deoxidation after described RH refine terminates, the addition of described Al base modification agent and intensification blowing oxygen quantity have following corresponding relation:
Described intensification blowing oxygen quantity is less than 0.3m3During/t, the addition of described Al base modification agent is 0.3kg/t;
Described intensification blowing oxygen quantity is 0.3～0.8m3During/t, the addition of described Al base modification agent is 0.3～0.8kg/t;
Described intensification blowing oxygen quantity is more than 0.8m3During/t, the addition of described Al base modification agent is 0.8～1.0kg/t.
Preferably, described RH refine adds described Al base modification agent again to described slag deoxidation after terminating, particularly as follows:
After described RH refine terminates, in the slag blister after promoting to RH dip pipe, add described Al base modification agent to described slag deoxidation.
Preferably, adding in the Al base modification agent step to slag deoxidation when described converter tapping terminates in ladle, the addition of described Al base modification agent and converter terminal oxygen content have corresponding relation:
When described converter terminal oxygen content is less than 650ppm, the addition of described Al base modification agent is 0.8～1.0kg/t;
When described converter terminal oxygen content is 650～850ppm, the addition of described Al base modification agent is 1.0～1.3kg/t;
When described converter terminal oxygen content is more than 850ppm, the addition of described Al base modification agent is 1.3～2kg/t.
Preferably, add in ladle in the Al base modification agent step to slag deoxidation when described converter tapping terminates, control reinforced arm sustained oscillation.
Preferably, in described ladle, also add Calx when converter tapping terminates.
Preferably, the calcium oxide content of described Calx is more than 85%.
Preferably, the granularity of described Al base modification agent is 10～50mm.
Preferably, described Al base modification agent is made up of according to percentage by weight following component: Al:40%～60%; CaF2: 5%～15%; CaO:20%～30%; Al2O3: 5%～10%.
The one or more technical schemes provided in the embodiment of the present invention, at least have the following technical effect that or advantage:
Owing to have employed addition Al base modification agent when converter tapping terminates, Al base modification agent is again added after RH refine terminates, avoid slag oxidisability in RH refining process to improve, different intensification blowing oxygen quantities uses the addition of different Al base modification agents, when RH refine can be made to set off, in slag, " FetO+MnO " stable content controls 3%～6%, thus decreasing follow-up calmness and casting cycle slag to pass oxygen degree to molten steel, solve problem in prior art, steel slag modification is unstable, thus improve Cleanliness of Molten Steel, decrease nonmetallic inclusionsin steel quantity, there is the suitability and extensively and control stable feature.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the flow chart of the method for modifying of embodiment of the present invention flat cold-rolled sheet slag.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
With reference to shown in Fig. 1, embodiments provide the method for modifying of a kind of flat cold-rolled sheet slag, including performing following steps S101～S102 successively.
In ladle, Al (aluminum) base modification agent is added to slag deoxidation when S101, converter tapping terminate.
Concrete, in ladle, add Al base modification agent when converter tapping terminates immediately, utilize the affiliated Al base modification agent of molten steel heat melts to slag deoxidation. Reinforced arm sustained oscillation, Fe in unstable oxide is controlled when adding Al base modification agenttO, MnO are evenly distributed at the top of the slag, it is achieved that Al base modification agent is uniform at slag surface deoxidation, thus ensureing that converter tapping slag fully can be carried out deoxidation by Al base modification agent.
In S101, the addition of Al base modification agent and converter terminal oxygen content have corresponding relation: when converter terminal oxygen content is less than 650ppm, the addition of Al base modification agent is 0.8～1.0kg/t; When converter terminal oxygen content is 650～850ppm, the addition of Al base modification agent is 1.0～1.3kg/t; When converter terminal oxygen content is more than 850ppm, the addition of Al base modification agent is 1.3～2kg/t. The addition of Al base modification agent is corresponding with converter terminal oxygen content, and the amount of the Al base modification agent that different converter terminal oxygen contents adds is different, and the unstable oxide stable content in slag that RH refine entered the station controls 5%～9%,
While S101 carries out or after converter tapping terminates, in ladle, add the CaO content Calx more than 85%.
S102, RH refine adds Al base modification agent again to slag deoxidation after terminating.
Specifically, in S102, after RH refine terminates, again add Al base modification agent according to intensification blowing oxygen quantity, float to after utilizing molten steel heat melts Al base modification agent in slag slag deoxidation, reduce further the unstable oxide content in slag. Specifically, the addition of Al base modification agent and intensification blowing oxygen quantity have following corresponding relation: intensification blowing oxygen quantity is less than 0.3m3During/t, the addition of Al base modification agent is 0.3kg/t; Intensification blowing oxygen quantity is 0.3～0.8m3During/t, the addition of Al base modification agent is 0.3～0.8kg/t; Intensification blowing oxygen quantity is more than 0.8m3During/t, the addition of Al base modification agent is 0.8～1.0kg/t.
In S102, after RH refine terminates, add Al base modification agent be specially in the slag blister after promoting to RH dip pipe and add Al base modification agent, float in slag slag deoxidation after utilizing molten steel heat melts Al base modification agent, refine terminates rear unstable oxide stable content control, 3%～6%, to improve Effect of Ownership Reform. The mode directly spreading Al base modification agent due to RH refine after terminating owing to slag viscosity is relatively big in slag face is avoided not reach upgrading effect.
In specific implementation process, the Al base modification agent used in S101 and S102 is identical modification agent, and specifically, the granularity of the Al base modification agent used is 10～50mm, it is ensured that melt speed. The Al base modification agent used is made up of according to percentage by weight following component: Al:40%～60%; CaF2(calcium fluoride): 5%～15%; CaO (calcium oxide): 20%～30%; Al2O3(aluminium oxide): 5%～10%. Thus being more beneficial for the oxidisability of stability contorting slag.
The example of the method for modifying of provided by the invention flat cold-rolled sheet slag is given below, the present invention is illustrated.
Example 1
Being applied to 300t ladle and smelt steel grade DC04, when converter tapping terminates: converter terminal oxygen content is 780ppm, tapping temperature is 1685 DEG C. Add Al base modification agent 355kg when converter tapping terminates immediately, and control reinforced arm sustained oscillation, with uniform Al base modification agent. Chemical examination obtains RH refine when entering the station: " Fe in slagtO+MnO " content is 8.3%, enter the station oxygen content 507ppm, and inlet temperature 1620 DEG C, without intensification oxygen blast. RH refine adds Al base modification agent 90kg in slag blister after RH dip pipe promotes after terminating again, floats in slag after slag deoxidation after utilizing molten steel heat melts Al base modification agent, records during RH refine departures " Fe in slagtO+MnO " content be 4.5%. Follow the tracks of follow-up casting process, water the secondary excellent position even watering 6 stoves and stablize, follow the tracks of cold-reduced sheet further and roll situation, it does not have detect and be substantially mingled with or stick up the defects such as skin.
Example 2
It is applied to 300t ladle and smelts steel grade SPHC, when converter tapping terminates: converter terminal oxygen content is 897ppm, and tapping temperature is 1713 DEG C, when converter tapping terminates, add Al base modification agent 425kg immediately, and control reinforced arm sustained oscillation, with uniform Al base modification agent. Chemical examination obtains RH refine when entering the station: " Fe in slagtO+MnO " content is 7.3%, enter the station oxygen content 475ppm, and inlet temperature 1637 DEG C, without intensification oxygen blast. RH refine adds Al base modification agent 90kg in slag blister after RH dip pipe promotes after terminating again, floats in slag after slag deoxidation, record " Fe in the slag composition of RH refine departures after utilizing molten steel heat melts Al base modification agenttO+MnO " content is 6.0%. Following the tracks of follow-up casting process, this waters secondary company and waters 10 stoves, only changes submersed nozzle one at the 4th stove, and whole time rod position of watering is without obvious rise. The normal strand T.O content of this heat is 13ppm through chemical examination. Follow the tracks of cold-reduced sheet rolling situation and find that surface quality is good.
Example 3
It is applied to 300t ladle and smelts steel grade DX54D, when converter tapping terminates: converter terminal oxygen content is 641ppm, tapping temperature 1692 DEG C, add Al base modification agent 362kg when converter tapping terminates immediately, and control reinforced arm sustained oscillation, with uniform Al base modification agent. When chemical examination RH refine is entered the station: " Fe in slagtO+MnO " content be 5.2%, enter the station oxygen content 477ppm, inlet temperature 1610 DEG C, intensification oxygen blast 152m3, RH refine terminate after RH dip pipe promote after slag blister in again add Al base modification agent 140kg, float in slag after utilizing molten steel heat melts Al base modification agent and slag carried out deoxidation, record RH refine departures time slag composition in " FetO+MnO " content is 4.0%. Following the tracks of follow-up casting process, this waters time even, and watering 7 stoves does not change the mouth of a river, follows the tracks of cold-reduced sheet rolling situation further, it does not have detect and be mingled with or stick up the defects such as skin.
Example 4
It is applied to 300t ladle and smelts steel grade DC06, when converter tapping terminates: converter terminal oxygen content is 597ppm, tapping temperature 1684 DEG C. Add Al base modification agent 342kg when converter tapping terminates immediately, and control reinforced arm sustained oscillation, with uniform Al base modification agent. When chemical examination RH refine is entered the station: " Fe in slagtO+MnO " content is 5.7%, enter the station oxygen content 473ppm, inlet temperature 1601 DEG C, intensification oxygen blast 250m3. PH refine terminate after RH dip pipe promote after slag blister in again add Al base modification agent 240kg, float in slag after utilizing molten steel heat melts Al base modification agent and slag carried out deoxidation, record RH refine departures time slag in " FetO+MnO " content is 5.5%. Following the tracks of follow-up casting process, even watering 6 stoves does not change the mouth of a river, follows the tracks of cold-reduced sheet rolling situation further, follows the tracks of cold-reduced sheet rolling situation and finds that surface quality is good.
By the one or more technical schemes provided in the invention described above embodiment, at least have the following technical effect that or advantage:
Owing to have employed addition Al base modification agent when converter tapping terminates, Al base modification agent is again added after RH refine terminates, avoiding slag oxidisability in RH refining process to improve, different intensification blowing oxygen quantities uses the addition of different Al base modification agents, " Fe in slag when RH refine can be made to set offtO+MnO " stable content controls 3%～6%; thus decreasing follow-up calmness and casting cycle slag to pass oxygen degree to molten steel; solve problem in prior art, steel slag modification is unstable; thus improve Cleanliness of Molten Steel; decrease nonmetallic inclusionsin steel quantity, there is the suitability wide and control stable feature.
Although preferred embodiments of the present invention have been described, but those skilled in the art are once know basic creative concept, then these embodiments can be made other change and amendment. So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art. So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. the method for modifying of a flat cold-rolled sheet slag, it is characterised in that including:
In ladle, Al base modification agent is added to slag deoxidation when converter tapping terminates;
RH refine adds described Al base modification agent again to described slag deoxidation after terminating;
Wherein, again adding in the described Al base modification agent step to described slag deoxidation after described RH refine terminates, the addition of described Al base modification agent and intensification blowing oxygen quantity have following corresponding relation:
Described intensification blowing oxygen quantity is less than 0.3m3During/t, the addition of described Al base modification agent is 0.3kg/t;
Described intensification blowing oxygen quantity is 0.3～0.8m3During/t, the addition of described Al base modification agent is 0.3～0.8kg/t;
Described intensification blowing oxygen quantity is more than 0.8m3During/t, the addition of described Al base modification agent is 0.8～1.0kg/t.
2. the method for modifying of flat cold-rolled sheet slag as claimed in claim 1, it is characterised in that described RH refine adds described Al base modification agent again to described slag deoxidation after terminating, particularly as follows:
After described RH refine terminates, in the slag blister after promoting to RH dip pipe, add described Al base modification agent to described slag deoxidation.
3. the method for modifying of flat cold-rolled sheet slag as claimed in claim 2, it is characterized in that, adding in ladle in the Al base modification agent step to slag deoxidation when described converter tapping terminates, the addition of described Al base modification agent and converter terminal oxygen content have corresponding relation:
When described converter terminal oxygen content is less than 650ppm, the addition of described Al base modification agent is 0.8～1.0kg/t;
When described converter terminal oxygen content is 650～850ppm, the addition of described Al base modification agent is 1.0～1.3kg/t;
When described converter terminal oxygen content is more than 850ppm, the addition of described Al base modification agent is 1.3～2kg/t.
4. the method for modifying of flat cold-rolled sheet slag as claimed in claim 3, it is characterised in that add in ladle in the Al base modification agent step to slag deoxidation when described converter tapping terminates, controls reinforced arm sustained oscillation.
5. the method for modifying of flat cold-rolled sheet slag as claimed in claim 4, it is characterised in that also add Calx when converter tapping terminates in described ladle.
6. the method for modifying of flat cold-rolled sheet slag as claimed in claim 5, it is characterised in that the calcium oxide content of described Calx is more than 85%.
7. the method for modifying of flat cold-rolled sheet slag as claimed in claim 1, it is characterised in that the granularity of described Al base modification agent is 10～50mm.
8. the method for modifying of flat cold-rolled sheet slag as claimed in claim 7, it is characterised in that described Al base modification agent is made up of according to percentage by weight following component:
Al:40%～60%;
CaF2: 5%～15%;
CaO:20%～30%;
Al2O3: 5%～10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610076772.2A CN105671238B (en) | 2016-02-03 | 2016-02-03 | A kind of method for modifying of flat cold-rolled sheet slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610076772.2A CN105671238B (en) | 2016-02-03 | 2016-02-03 | A kind of method for modifying of flat cold-rolled sheet slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105671238A true CN105671238A (en) | 2016-06-15 |
| CN105671238B CN105671238B (en) | 2017-12-22 |
Family
ID=56304107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610076772.2A Active CN105671238B (en) | 2016-02-03 | 2016-02-03 | A kind of method for modifying of flat cold-rolled sheet slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105671238B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453028A (en) * | 2019-09-04 | 2019-11-15 | 鞍钢股份有限公司 | A method of reducing Aluminum steel field trash |
| CN112646953A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Steel slag modification method and device for ultra-low carbon steel |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752221A (en) * | 2005-10-11 | 2006-03-29 | 梅一峰 | Modified aluminium slag ball of refining slag and preparing method thereof |
| CN101392311A (en) * | 2007-09-22 | 2009-03-25 | 鞍钢股份有限公司 | RH-OB molten steel refining method |
| CN102586544A (en) * | 2012-03-20 | 2012-07-18 | 西峡县恒基冶材有限公司 | High-calcium pre-molten slag modification aluminium slag ball and preparation method thereof |
| CN102851435A (en) * | 2012-09-12 | 2013-01-02 | 首钢总公司 | Ultra-low-carbon, low-silicon and low-oxygen steel and smelting method thereof |
| CN102978505A (en) * | 2012-11-20 | 2013-03-20 | 首钢总公司 | Smelting method of high-strength IF steel |
| CN103374642A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
| CN104178682A (en) * | 2014-08-12 | 2014-12-03 | 首钢京唐钢铁联合有限责任公司 | Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese |
| CN104928558A (en) * | 2015-07-02 | 2015-09-23 | 首钢总公司 | Low-carbon steel for deep drawing and smelting method thereof |
-
2016
- 2016-02-03 CN CN201610076772.2A patent/CN105671238B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752221A (en) * | 2005-10-11 | 2006-03-29 | 梅一峰 | Modified aluminium slag ball of refining slag and preparing method thereof |
| CN101392311A (en) * | 2007-09-22 | 2009-03-25 | 鞍钢股份有限公司 | RH-OB molten steel refining method |
| CN102586544A (en) * | 2012-03-20 | 2012-07-18 | 西峡县恒基冶材有限公司 | High-calcium pre-molten slag modification aluminium slag ball and preparation method thereof |
| CN103374642A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
| CN102851435A (en) * | 2012-09-12 | 2013-01-02 | 首钢总公司 | Ultra-low-carbon, low-silicon and low-oxygen steel and smelting method thereof |
| CN102978505A (en) * | 2012-11-20 | 2013-03-20 | 首钢总公司 | Smelting method of high-strength IF steel |
| CN104178682A (en) * | 2014-08-12 | 2014-12-03 | 首钢京唐钢铁联合有限责任公司 | Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese |
| CN104928558A (en) * | 2015-07-02 | 2015-09-23 | 首钢总公司 | Low-carbon steel for deep drawing and smelting method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453028A (en) * | 2019-09-04 | 2019-11-15 | 鞍钢股份有限公司 | A method of reducing Aluminum steel field trash |
| CN112646953A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Steel slag modification method and device for ultra-low carbon steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105671238B (en) | 2017-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103627853A (en) | Method for manufacturing low-carbon and low-silicon steel | |
| CN108823346B (en) | method for producing secondary flaw detection Q345R medium steel plate with low cost | |
| CN104131210B (en) | The production method of ultralow phosphorus IF steel | |
| CN102248142B (en) | Method for producing medium and low carbon aluminum killed steel | |
| CN100510112C (en) | Short-flow super low carbon steel ultra-low sulphur smelting control method | |
| CN101545066B (en) | Method for smelting H2S corrosion resistant petroleum casing pipe steel 110S | |
| CN102864378B (en) | Process for smelting low-cost X70 pipeline steel moderate-thickness plate blanks | |
| CN105018855B (en) | Method for producing circular sulfur-resistant pipeline steel billet for oil and gas collection and transmission | |
| CN104032095B (en) | A kind of method of liquid steel dephosphorization agent and liquid steel dephosphorization | |
| CN102312054A (en) | Ladle furnace low alkalinity slag refining process | |
| CN102787195A (en) | Stainless-steel smelting method | |
| CN104195290A (en) | Molten steel dephosphorization agent and molten steel dephosphorization refining method | |
| CN101643815A (en) | Vulcanization method for smelting high-sulfur stainless steel | |
| CN110846459A (en) | Converter and smelting method thereof | |
| CN104263880B (en) | A kind of stainless steel smelting method adapting to high phosphorus raw material | |
| CN105671238A (en) | Modification method for cold-rolled sheet steel slag | |
| CN107385139A (en) | A kind of smelting process of high-carbon steel | |
| CN102719614B (en) | Process for producing anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining | |
| CN102719728B (en) | Technique for producing anti-acid pipeline steel by RH-LF-VD refining | |
| CN104988270A (en) | Method for smelting pipeline steel with low cost | |
| CN104561434A (en) | Low-phosphorus steel smelting process | |
| CN107236893A (en) | Control the high titanium welding wire steel production method of high-melting-point field trash | |
| CN110317919B (en) | Low-cost production method of low-carbon enamel steel | |
| CN105543439A (en) | Low-phosphorus steel smelting technology | |
| CN104046923B (en) | The X80 pipe line steel smelted under half steel condition and production technique thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
|
| CP01 | Change in the name or title of a patent holder |