CN102296160A - Low-cost RH molten steel nitrogen increasing and controlling process - Google Patents
Low-cost RH molten steel nitrogen increasing and controlling process Download PDFInfo
- Publication number
- CN102296160A CN102296160A CN2011102357024A CN201110235702A CN102296160A CN 102296160 A CN102296160 A CN 102296160A CN 2011102357024 A CN2011102357024 A CN 2011102357024A CN 201110235702 A CN201110235702 A CN 201110235702A CN 102296160 A CN102296160 A CN 102296160A
- Authority
- CN
- China
- Prior art keywords
- nitrogen
- molten steel
- steel
- cost
- vanadium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a low-cost RH molten steel nitrogen increasing process and belongs to the technical field of steelmaking. In the low-cost RH molten steel nitrogen increasing process, a process route of processing by a converter, refining by a ladle furnace, RH refining and continuous casting is adopted to carry out smelting; the deoxidation alloying is adopted in the tapping process of the converter; in the tapping process, ferrovanadium is added according to a target value of the type of steel to distribute vanadium; the ladle furnace is subjected to molten steel heating, fine adjustment of alloy and deep desulfurization processing according to a normal process; after molten steel is suspended to a RH furnace, nitrogen is used as lift gas of the RH furnace, the flow is controlled according to the range of 800 to 1,200NL/min and the vacuumizing processing time is in the range of 8 to 10 min; and after the vacuumizing processing is completed, the operation of wire feeding and soft blowing is normally carried out, so that the level that the nitrogen content in the steel is in the range of 80 to 120ppm is achieved. The low-cost RH molten steel nitrogen increasing process has the advantages that vanadium-nitrogen alloy can be partly replaced, so that the alloy cost is reduced; the stability of the nitrogen content is ensured and the performance fluctuation of a steel plate, which is caused by the ingredient fluctuation, is reduced; and in the RH refining phase, argon is replaced with nitrogen so that the process and ingredient control dual-purpose functions are realized, and thus, the steelmaking process cost is further reduced.
Description
Technical field
The invention belongs to the field of steel-making technical field, a kind of low-cost RH molten steel nitrogen pick-up control nitrogen technology particularly is provided, be applicable to the high-strength low-alloy steel kind production that utilizes the precipitation strength of vanadium nitrogen, can control nitrogen in steel content by enough lower cost process stabilizings, thereby satisfy the plate property requirement.
Background technology
Cost of alloy is occupied larger proportion in whole steel plate cost, the effective way that under the prerequisite that guaranteed performance requires, is the reduction product cost with the high value alloy of low value alloy replacing, VN alloy is a kind of novel alloy additive, can substitute the production that vanadium iron is used for microalloyed steel.Vanadium nitride makes an addition to the comprehensive mechanical performances such as intensity, toughness, ductility and thermal fatigue resistance that can improve steel in the steel, and makes steel have good weldability.Reaching under the same intensity, adding vanadium nitride and save vanadium add-on 30-40%, and then reduced cost.VN alloy is applied to can carry out effective vanadium, nitrogen microalloying simultaneously in the high-strength low-alloy steel, and what promote carbon in the steel, vanadium, nitrogen compound separates out more effective performance sedimentation reinforcement and crystal grain thinning effect.In order to reach above-mentioned target, need the nitrogen content in the steel to keep higher level, nitrogen pick-up in the steel, make the vanadium that is in the solid solution attitude change the vanadium of separating out attitude into, give full play to the precipitation strength of vanadium, along with the increase of nitrogen content, the motivating force that vanadium nitrogen is separated out is big more, and basic demand could effectively promote the vanadium nitrogen compound to separate out at 80-120ppm or higher content.And under the conventional smelting technology condition, mainly carry out the composition adjustment by VN alloy, and there are many drawbacks in this method: improper as vanadium nitrogen ratio, nitrogen element absorption rate instability or specific absorption are low etc., and this production to vanadium nitrogen steel affects greatly.Realize molten steel nitrogen pick-up by the adjustment of RH refinery practice, then can guarantee the stable of nitrogen content and can further save cost of alloy.In the RH treating processes, at the soaking tub internal recycle, generally lift gas is an argon gas to molten steel by lift gas, if during production VN alloy steel grade, adopt nitrogen to substitute argon gas, make that nitrogen content in the molten steel is stable and reach the steel grade requirement, then can realize low cost production as lift gas.
Summary of the invention
The object of the present invention is to provide a kind of RH molten steel nitrogen pick-up control nitrogen technology, for the operational path that adopts " converter-ladle furnace refining-RH stove vacuum-treat-continuous casting " is smelted the high-strength low-alloy steel kind of utilizing the VN alloy precipitation strength.
In the RH treating processes, molten steel by lift gas at the soaking tub internal recycle, generally lift gas is an argon gas, if during the high-strength low-alloy steel kind of production VN alloy precipitation strength, adopt nitrogen to substitute argon gas as lift gas, certain flow and cycling time are set, make that nitrogen content in the molten steel is stable and reach the steel grade requirement, can realize that then molten steel nitrogen pick-up adds ferro-vanadium instead of pure VN alloy low cost production.
The present invention realizes by following technical proposal:
Adopt the operational path of " converter-ladle furnace refining-RH refining-continuous casting " to smelt, converter tapping adopts deoxidation alloying, tapping process adds ferro-vanadium by the steel grade target value and joins vanadium, ladle furnace carries out molten steel heating by normal process, alloy fine setting and dark desulfurization are handled, after molten steel winches to the RH stove, RH stove lift gas is set to nitrogen, flow is controlled according to 800-1200NL/min, vacuumize treatment time 8-10min, vacuum finishes the normal line feeding of laggard row, the soft blow operation, can reach nitrogen in steel content in the 80-120ppm level, final qualified molten steel pours into qualified steel billet by continuous caster.
The present invention has following advantage and effect: (1) can partly substitute VN alloy, reduces cost of alloy; (2) guarantee that nitrogen content is stable, be reduced to the plate property fluctuation that the branch fluctuation causes; (3) the RH refining stage substitutes argon gas with nitrogen and realizes technology and Composition Control dual-use function, further reduces the steel making working procedure cost.
Embodiment
Embodiment 1
Certain steel mill carries out low alloy steel Q345C and smelts, operational path is " converter smelting-ladle furnace refining-RH refining-continuous casting ", produce 2 stoves, liquid steel temperature was 1630 ℃ and 1640 ℃ when ladle refining finished, alloying constituent reaches the target control scope, after molten steel winches to the RH stove, RH stove lift gas is set to nitrogen, flow is controlled according to 800-1200NL/min, vacuumizes treatment time 8-10min, and vacuum finishes the normal line feeding of laggard row, each 200m of feeding silicon-calcium wire, carry out the soft blow operation then, difference soft blow 8min and 9min, nitrogen in steel content reaches 92.3ppm and 85.2ppm respectively, meets the requirement of the required nitrogen content of VN alloy steel grade.
Embodiment 2
Certain steel mill carries out low alloy steel Q345E and smelts, operational path is " hot metal pretreatment-converter smelting-ladle furnace refining-RH refining-continuous casting ", produce 2 stoves, liquid steel temperature was 1635 ℃ and 1632 ℃ when ladle refining finished, alloying constituent reaches the target control scope, after molten steel winches to the RH stove, RH stove lift gas is set to nitrogen, flow is controlled according to 800-1200NL/min, vacuumizes treatment time 8-10min, and vacuum finishes the normal line feeding of laggard row, each 200m of feeding silicon-calcium wire, carry out the soft blow operation then, difference soft blow 10min and 8min, nitrogen in steel content reaches 83.9ppm and 105ppm respectively, meets the required nitrogen content requirement of VN alloy steel grade.
Claims (1)
1. a low-cost RH molten steel nitrogen pick-up control nitrogen technology adopts the operational path of " converter-ladle furnace refining-RH refining-continuous casting " to smelt; It is characterized in that, converter tapping adopts deoxidation alloying, tapping process adds ferro-vanadium by the steel grade target value and joins vanadium, ladle furnace carries out molten steel heating, alloy fine setting and dark desulfurization by normal process to be handled, and after molten steel winched to the RH stove, RH stove lift gas was set to nitrogen, flow is controlled according to 800-1200NL/min, vacuumize treatment time 8-10min, vacuum finishes the normal line feeding of laggard row, soft blow operation, reaches nitrogen in steel content in the 80-120ppm level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102357024A CN102296160A (en) | 2011-08-16 | 2011-08-16 | Low-cost RH molten steel nitrogen increasing and controlling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102357024A CN102296160A (en) | 2011-08-16 | 2011-08-16 | Low-cost RH molten steel nitrogen increasing and controlling process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102296160A true CN102296160A (en) | 2011-12-28 |
Family
ID=45356835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102357024A Pending CN102296160A (en) | 2011-08-16 | 2011-08-16 | Low-cost RH molten steel nitrogen increasing and controlling process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102296160A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102634643A (en) * | 2012-04-10 | 2012-08-15 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling nitrogen content of high-permeability-grade oriented electrical steel belt |
| CN102899456A (en) * | 2012-09-25 | 2013-01-30 | 鞍钢股份有限公司 | Method for reducing nitrogen increase of molten steel in refined-smelting ladle furnace (LF) in heating process |
| CN102925618A (en) * | 2012-10-23 | 2013-02-13 | 鞍钢股份有限公司 | Method for increasing nitrogen of vanadium and nitrogen-containing microalloy steel |
| CN102978343A (en) * | 2012-11-19 | 2013-03-20 | 首钢总公司 | Method for controlling nitrogen increasing of RH refined molten steel |
| CN103952511A (en) * | 2014-04-03 | 2014-07-30 | 商洛学院 | Method for controlling nitrogen content of high-strength steel molten steel |
| CN104550898A (en) * | 2014-12-27 | 2015-04-29 | 首钢总公司 | Nitrogen increment method for vanadium-nitrogen microalloying steel grade in continuous casting process |
| CN104962698A (en) * | 2015-07-07 | 2015-10-07 | 新余钢铁集团有限公司 | Accurate control method for nitrogen content of oriented electrical steel |
| CN106591541A (en) * | 2016-12-23 | 2017-04-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Dehydrating nitrogen increasing control method in RH vacuum treatment process |
| CN110628988A (en) * | 2019-10-21 | 2019-12-31 | 马鞍山钢铁股份有限公司 | Method for smelting nitrogen-containing steel |
| CN113025780A (en) * | 2021-02-24 | 2021-06-25 | 首钢京唐钢铁联合有限责任公司 | Production method of ultrahigh nitrogen tin plate |
| CN114107610A (en) * | 2021-11-26 | 2022-03-01 | 宝武集团鄂城钢铁有限公司 | Vacuum nitrogen increasing refining method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6428319A (en) * | 1987-07-24 | 1989-01-30 | Nippon Kokan Kk | Production of nitrogen-containing steel |
| CN1116241A (en) * | 1994-08-03 | 1996-02-07 | 宝山钢铁(集团)公司 | Producing technology of low hydrogen high nitrogen steel |
| JP2006283080A (en) * | 2005-03-31 | 2006-10-19 | Jfe Steel Kk | Method for smelting high nitrogen steel |
-
2011
- 2011-08-16 CN CN2011102357024A patent/CN102296160A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6428319A (en) * | 1987-07-24 | 1989-01-30 | Nippon Kokan Kk | Production of nitrogen-containing steel |
| CN1116241A (en) * | 1994-08-03 | 1996-02-07 | 宝山钢铁(集团)公司 | Producing technology of low hydrogen high nitrogen steel |
| JP2006283080A (en) * | 2005-03-31 | 2006-10-19 | Jfe Steel Kk | Method for smelting high nitrogen steel |
Non-Patent Citations (2)
| Title |
|---|
| 王会忠等: "48MnV-C非调质曲轴钢增氮工艺研究", 《炼钢》 * |
| 王雅贞，李承祚等: "《转炉炼钢问答》", 31 July 2003, 冶金工业出版社 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102634643A (en) * | 2012-04-10 | 2012-08-15 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling nitrogen content of high-permeability-grade oriented electrical steel belt |
| CN102634643B (en) * | 2012-04-10 | 2013-08-14 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling nitrogen content of high-permeability-grade oriented electrical steel belt |
| CN102899456A (en) * | 2012-09-25 | 2013-01-30 | 鞍钢股份有限公司 | Method for reducing nitrogen increase of molten steel in refined-smelting ladle furnace (LF) in heating process |
| CN102925618A (en) * | 2012-10-23 | 2013-02-13 | 鞍钢股份有限公司 | Method for increasing nitrogen of vanadium and nitrogen-containing microalloy steel |
| CN102978343A (en) * | 2012-11-19 | 2013-03-20 | 首钢总公司 | Method for controlling nitrogen increasing of RH refined molten steel |
| CN103952511A (en) * | 2014-04-03 | 2014-07-30 | 商洛学院 | Method for controlling nitrogen content of high-strength steel molten steel |
| CN104550898A (en) * | 2014-12-27 | 2015-04-29 | 首钢总公司 | Nitrogen increment method for vanadium-nitrogen microalloying steel grade in continuous casting process |
| CN104962698A (en) * | 2015-07-07 | 2015-10-07 | 新余钢铁集团有限公司 | Accurate control method for nitrogen content of oriented electrical steel |
| CN106591541A (en) * | 2016-12-23 | 2017-04-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Dehydrating nitrogen increasing control method in RH vacuum treatment process |
| CN106591541B (en) * | 2016-12-23 | 2018-08-28 | 江苏沙钢集团淮钢特钢股份有限公司 | A kind of dehydrogenation nitrogen pick-up control method during RH application of vacuum |
| CN110628988A (en) * | 2019-10-21 | 2019-12-31 | 马鞍山钢铁股份有限公司 | Method for smelting nitrogen-containing steel |
| CN113025780A (en) * | 2021-02-24 | 2021-06-25 | 首钢京唐钢铁联合有限责任公司 | Production method of ultrahigh nitrogen tin plate |
| CN114107610A (en) * | 2021-11-26 | 2022-03-01 | 宝武集团鄂城钢铁有限公司 | Vacuum nitrogen increasing refining method |
| CN114107610B (en) * | 2021-11-26 | 2022-09-09 | 宝武集团鄂城钢铁有限公司 | Vacuum nitrogen increasing refining method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102296160A (en) | Low-cost RH molten steel nitrogen increasing and controlling process | |
| CN103160729B (en) | Medium-carbon microalloyed steel for engineering machinery caterpillar chain piece and production process thereof | |
| CN103642970B (en) | A kind of smelting process of carbon aluminium-killed steel | |
| CN102206730B (en) | Method for controlling oxygen and reducing nitrogen in molten steel | |
| CN103627841A (en) | Control method for nitrogen content of molten steel of wear-resistant steel | |
| CN101705334A (en) | Aluminum-calcium-magnesium-cerium composite alloy used for strong desulfurization, final desoxidation, and quenching and tempering of liquid steel | |
| CN113817950B (en) | Method for stably controlling nitrogen in LF furnace by using nitrogen | |
| CN110343954A (en) | A kind of connection rod of automobile engine steel and its manufacturing method | |
| CN104233064A (en) | 170MPa-grade cold-rolled phosphorized IF high-strength steel and production method thereof | |
| CN110438413B (en) | Production process of vanadium-containing steel bar | |
| CN103215410B (en) | A kind of method improved containing Nb, Ti steel cleanness | |
| CN102703644A (en) | Method for producing low-carbon high-chrome alloy steel | |
| CN110541114A (en) | smelting method of high-nitrogen high-sulfur low-aluminum steel | |
| CN112322983A (en) | Ti + Nb microalloyed component steel hot-rolled steel strip for steam shaft and preparation method thereof | |
| CN112708720A (en) | Smelting method for improving niobium yield of low-carbon low-silicon niobium-containing steel | |
| CN112226682A (en) | Titanium microalloying production process for deformed steel bar | |
| CN103361552A (en) | V-N microalloying 460MPa-level thick plate and manufacturing method thereof | |
| CN102851455A (en) | Method for producing high-nitrogen IF steel | |
| CN105177408A (en) | Low-cost hot-rolled thin strip steel containing boron and manufacturing method thereof | |
| CN113637918A (en) | Titanium alloying HRB400E hot-rolled ribbed steel bar and manufacturing method thereof | |
| CN107502704B (en) | Method for reducing alumina inclusions in semisteel steelmaking casting blank | |
| CN102732686A (en) | Method for producing vanadium-nitrogen micro-alloying high-strength steel by two-step vacuum method | |
| CN110317919B (en) | Low-cost production method of low-carbon enamel steel | |
| CN104046923B (en) | The X80 pipe line steel smelted under half steel condition and production technique thereof | |
| CN114293093B (en) | 600 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method 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 | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111228 |