CN102876851A - Method for improving calcium yield of RH vacuum furnace - Google Patents

Method for improving calcium yield of RH vacuum furnace Download PDF

Info

Publication number
CN102876851A
CN102876851A CN2012103771882A CN201210377188A CN102876851A CN 102876851 A CN102876851 A CN 102876851A CN 2012103771882 A CN2012103771882 A CN 2012103771882A CN 201210377188 A CN201210377188 A CN 201210377188A CN 102876851 A CN102876851 A CN 102876851A
Authority
CN
China
Prior art keywords
steel
slag
calcium
carry
control
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
Application number
CN2012103771882A
Other languages
Chinese (zh)
Other versions
CN102876851B (en
Inventor
刘小鸥
王春锋
夏春祥
刘凯
王金平
刘先同
谭佳梅
钱龙
鲁娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Iron and Steel Co Ltd
Original Assignee
Wuhan Iron and Steel Group Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wuhan Iron and Steel Group Corp filed Critical Wuhan Iron and Steel Group Corp
Priority to CN201210377188.2A priority Critical patent/CN102876851B/en
Publication of CN102876851A publication Critical patent/CN102876851A/en
Application granted granted Critical
Publication of CN102876851B publication Critical patent/CN102876851B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

A method for improving the calcium yield of an RH vacuum furnace includes the steps: molten iron treatment; converter smelting; refining in an LF furnace; RH vacuum treatment; and tapping and casting to form a billet. By the method, the calcium yield of the RH vacuum furnace is stably improved from 3-5% to 8-12%, and the number of continuous molten iron casting and rolling furnaces of the RH vacuum furnace is increased from 2.7 to 9, so that consumption of raw materials is reduced, the operating rate of a unit is increased, and production cost is reduced. The method is wide in applicable range, namely, the method can be used for all steel types of continuous casting and rolling RH production for sheet billets.

Description

A kind of method that improves calcium recovery rate in the RH vacuum oven
Technical field
The present invention relates to the smelting process of molten steel, refer to particularly the method for calcium recovery rate in a kind of RH of raising vacuum oven.
Background technology
The relation of the casting properties of continuous casting steel, tissue, characteristic and non-metallic inclusion is very close.Therefore, in steelmaking process, not only to control the chemical ingredients of molten steel well, but also will control the non-metallic inclusion in the steel, with so that guarantee the purity of molten steel.In order to improve steel performance, as using the formation of manganese sulfide inclusion in " calcium processings " minimizing steel, thereby the sulfide inclusion of avoiding forming strip improves the anisotropy of steel; Process by calcium molten steel is carried out " hot-short " etc. that desulfurization reduces steel, usually all use the method that molten steel is carried out " calcium processing " to change slag inclusion thing form in the steel.
Aluminium is widely adopted in steelmaking process as strong reductor, but with in steel, forming a large amount of aluminium sesquioxides behind the aluminium deoxidation.Because it is clean that aluminium sesquioxide is difficult to remove, thereby when casting, be easy to stick to the interruption that mouth of a river wall causes the nozzle clogging casting cycle from steel.In order to address this problem, method commonly used is molten steel to be carried out calcium process, and by to adding certain calcium in the steel, forms low-melting calcium aluminate so that dystectic aluminium sesquioxide is combined with calcium oxide, thereby greatly improves the casting properties of molten steel.
The calcium metallurgical technology has been used very generally in modern steelmaking process in a word, but improper if the calcium processing is controlled, and not only can not reach the metallurgical effect of expection, can worsen on the contrary the casting properties of steel.If the control of calcium treatment technology was not at that time; not only nozzle clogging is brought impact; and also can make a big impact to the covering slag performance of melting in the continuous cast mold and the behavior of solidifying of molten steel; when the CaO pulvis of using such as desulfurization makes moist; if being sprayed into a large amount of CaO, molten steel carries out the desulfurization processing; can cause that [H] content significantly raises in the steel; if add that rhythm of production is nervous; after calcium is processed; later stage stirs and calm deficiency of time; inclusion floating is insufficient, and after continuous casting was opened and watered, the covering slag performance can sharply worsen; can't keep its normally lubricated and heat transmission function; this moment, the serious variation of heat-transfer effect in the crystallizer can not reach the metallurgical effect of expection, produced a series of product quality problems and even bleed-out accident.
Because the density solubleness lower, in steel of calcium is little, the vapour pressure of calcium is large, boiling point is low, high volatile volatile and chemically reactive, so that the calcium amount that adds in the steel is large, yet recovery rate is but very low, and being subjected to factor affecting such as the quantity of slag in deoxidation of molten steel situation, the ladle, the calcium contents difficulty that will stablize in the large production of reality in the control steel is larger.The method that the Xiang Gangzhong that commonly uses in the large production of at present industry adds calcium has two kinds: the one, dust; The 2nd, feed silk.The conditional request of the pulvis preparation of the technology of dusting, conveying, protection against the tide is higher, facility investment is larger, cost is high, and dusting, it is large easily to cause increasing in the steel hydrogen, nitrogen pick-up, temperature drop, not only can reach the effect of dusting and greatly overcome the shortcoming of dusting and feed silk, therefore " calcium processing " hello silk technology has obtained rapid popularization in the eighties.
In continuous casting and rolling technique of sheet bar, because a lot of steel grades are to S, P, O, N, H, the C element requires very low, need to process through the RH vacuum oven, for " slag inclusion thing sex change in the steel " and " desulfurization " reach " castability that solves continuous caster " problem, all need in processing, the RH vacuum oven carry out " calcium processing ", but FeO+MnO is unstable in the RH Zinc Vacuum Furnace Slag, usually cause RH vacuum oven calcium to process recovery rate and only be 3-5% and unstable, the non-constant of calcium treatment effect, make smelting cost high, steel quality is poor, the continuous casting of molten steel that causes RH in the continuous casting and rolling technique of sheet bar to produce connects that to water the stove number often very low, usually only has 2~3 stoves.The major cause that produces this phenomenon is that slag fluidity was bad after the RH vacuum oven was processed, between the slag reaction insufficient, the oxygen in the slag and the oxygen in the molten steel are in nonequilibrium state, FeO+MnO is in utmost point unsteady state in the slag, the time low when high.And the calcium line amount of squeezing in the steel by production engineering specifications in the calcium treating processes is certain, and therefore when FeO+MnO content was high, it is on the low side that calcium is processed recovery rate.When FeO+MnO content was low, it is higher that calcium is processed recovery rate.And the molten aluminium content of the acid in the molten steel is high, in the cast, cotton-shapedly be mixed in the enrichment of mouth of a river place and cause nozzle clogging, because the thinslab casting slab thickness is 50mm thick (it is thick that conventional continuous caster slab thickness is generally 200mm) only, therefore in its continuous casting water-coating port than little many of water-coating port in the conventional continuous casting, purity and castability to molten steel are had relatively high expectations, and require higher to RH vacuum oven calcium treatment effect.Calcium processing recovery rate is on the low side or higher all can not to form low-melting calcium aluminate so that dystectic aluminium sesquioxide is combined with calcium oxide, (annotate: thinslab casting generally is middle water-coating port dross finally to cause in the continuous casting water-coating port or ladle nozzle dross, conventional continuous caster generally is the ladle nozzle dross, generally solve many than conventional continuous caster nozzle clogging problem hard of thinslab casting nozzle clogging, because of in thinslab casting in the water-coating port dross, its ladle nozzle does not have dross), it is unstable that RH vacuum oven calcium is processed recovery rate, and the low restricted link that has become sheet billet continuous casting and rolling production line production RH steel.
Process the low and instability problem of recovery rate for solving calcium, have the special-purpose used device of use that the calcium alloy rod is inserted into ladle bottom, improve the recovery rate of calcium, the deficiency of its existence is that not only cost is too high, and the FeO+MnO problem is very little in the solution slag;
For the stove number waters in the company of improving RH steel continuous caster, some factory has adopted " converter+LF+RH+ calcium is processed " to reach " converter+RH+LF+calcium is processed ", " converter+LF+RH+ LF+ calcium is processed " technique, though the stove number is watered in the company of continuous caster certain effect is arranged, finally all can't resolve RH steel calcium and process oxidisability problem and the low and instability problem of RH steel calcium processing recovery rate in the front slag.
Summary of the invention
The objective of the invention is only to be 3-5% and unstable in order to solve CSP RH vacuum oven calcium processing recovery rate, and improve continuous casting and even water the low problem of stove number, provide a kind of RH vacuum oven calcium to process recovery rate and be at least 8% and stable, connect the method for watering calcium recovery rate in the raising RH vacuum oven that the stove number reaches 9 stoves at least.
Realize the measure of above-mentioned purpose:
A kind of method that improves calcium recovery rate in the RH vacuum oven, its step:
1) carrying out molten iron processes;
2) carry out converter smelting;
3) in the LF stove, carry out refining:
A, carry out Argon, argon blowing time is not less than 1 minute, and adopts the positive pressure operation, and namely pressure is higher than environmental stress and gets final product;
B, change slag, change the slag time to be controlled at 3~10 minutes;
C, change slag and finish after, add lime according to 3.3~5.0 kg/tonnes of steel, add refining slag according to 0.67~2.0 kg/tonne of steel, and according to 6.0~7.0 kg/tonnes of steel control quantity of slag, the oxygen level in the control molten steel is at 350~450PPm;
4) carry out the RH vacuum-treat, and add lime according to 2.0~3.0 kg/tonnes of steel, and according to being routinely added to refining agent or sweetening agent;
5) be sprinkled into aluminum shot according to 0.1~0.5 kg/tonne of steel at the slag surface uniform, again according to 4.0~6.0 meters/ton steel feeding silicon-calcium wires, and the control wire-feeding velocity is not less than 5 meter per seconds; FeO+MnO≤5.5 (wt%) in the control slag; Carry out conventional soft blow;
6) tap and pour into base.
It is characterized in that: when slag produces the crust phenomenon, adopt adding iron calcium line to carry out broken shell, the iron calcium line adds according to 0.70~1.4 meter/ton steel control.
The present invention compared with prior art, RH vacuum oven calcium is processed recovery rate by the stable 8-12% that brings up to of 3-5%, RH vacuum oven continuous casting of molten steel tandem rolling stove number is brought up at least 9 stoves by 2.7 stoves, thereby reduced the usage quantity of this raw material, improve the unit operation rate, reduce production costs, and the present invention is applied widely, namely can be used for all steel grades that CSP RH produces.
Embodiment
The below is described in detail the present invention:
Embodiment 1
A kind of method that improves calcium recovery rate in the RH vacuum oven, its step:
1) carrying out molten iron processes;
2) carry out converter smelting;
3) in the LF stove, carry out refining:
A, carry out Argon, argon blowing time 1.5 minutes, and adopt the positive pressure operation, namely pressure is higher than environmental stress and gets final product;
B, change slag, change the slag time to be controlled at 3 minutes;
C, change slag and finish after, add lime according to 3.3 kg/tonnes of steel, add refining slag according to 0.67 kg/tonne of steel, and according to 6.5 kg/tonnes of steel control quantity of slag, the oxygen level in the control molten steel is at 380PPm;
4) carry out the RH vacuum-treat, and add lime according to 2.0 kg/tonnes of steel, and according to being routinely added to refining agent or sweetening agent;
5) be sprinkled into aluminum shot according to 0.4 kg/tonne of steel at the slag surface uniform, again according to 4.0 meters/ton steel feeding silicon-calcium wires, and the control wire-feeding velocity is at 5 meter per seconds; FeO+MnO is 5.0 (wt%) in the slag; Carry out conventional soft blow;
6) tap and pour into base.
Present embodiment after testing, the calcium recovery rate is 8.3% in the RH vacuum oven, connects that to water the stove number be 9 stoves.
Embodiment 2
A kind of method that improves calcium recovery rate in the RH vacuum oven, its step:
1) carrying out molten iron processes;
2) carry out converter smelting;
3) in the LF stove, carry out refining:
A, carry out Argon, argon blowing time 2 minutes, and adopt the positive pressure operation, namely pressure is higher than environmental stress and gets final product;
B, change slag, change the slag time to be controlled at 4.5 minutes;
C, change slag and finish after, add lime according to 3.8 kg/tonnes of steel, add refining slag according to 0.95 kg/tonne of steel, and according to 6.0 kg/tonnes of steel control quantity of slag, the oxygen level in the control molten steel is at 390PPm;
4) carry out the RH vacuum-treat, and add lime according to 2.3 kg/tonnes of steel, and according to being routinely added to refining agent or sweetening agent;
5) be sprinkled into aluminum shot according to 0.45 kg/tonne of steel at the slag surface uniform, again according to 5.0 meters/ton steel feeding silicon-calcium wires, and the control wire-feeding velocity is at 5.5 meter per seconds; FeO+MnO is 4.5 (wt%) in the slag; Carry out conventional soft blow;
6) tap and pour into base.
Present embodiment after testing, the calcium recovery rate is 8.8% in the RH vacuum oven, connects that to water the stove number be 10 stoves.
Embodiment 3
A kind of method that improves calcium recovery rate in the RH vacuum oven, its step:
1) carrying out molten iron processes;
2) carry out converter smelting;
3) in the LF stove, carry out refining:
A, carry out Argon, argon blowing time 2.5 minutes, and adopt the positive pressure operation, namely pressure is higher than environmental stress and gets final product;
B, change slag, change the slag time to be controlled at 6 minutes;
C, change slag and finish after, add lime according to 4.2 kg/tonnes of steel, add refining slags according to 1.35 kg/tonnes of steel, and according to 7.0 kg/tonnes of steel control quantity of slag, the oxygen level in the control molten steel is at 400PPm;
4) carry out the RH vacuum-treat, and add lime according to 2.6 kg/tonnes of steel, and according to being routinely added to refining agent or sweetening agent;
5) be sprinkled into aluminum shot according to 0.2 kg/tonne of steel at the slag surface uniform, again according to 5.5 meters/ton steel feeding silicon-calcium wires, and the control wire-feeding velocity is at 6.5 meter per seconds; FeO+MnO is 4.8 (wt%) in the slag; Carry out conventional soft blow;
6) tap and pour into base.
Present embodiment after testing, the calcium recovery rate is 9.5% in the RH vacuum oven, connects that to water the stove number be 11 stoves.
Embodiment 4
A kind of method that improves calcium recovery rate in the RH vacuum oven, its step:
1) carrying out molten iron processes;
2) carry out converter smelting;
3) in the LF stove, carry out refining:
A, carry out Argon, argon blowing time 3 minutes, and adopt the positive pressure operation, namely pressure is higher than environmental stress and gets final product;
B, change slag, change the slag time to be controlled at 8 minutes;
C, change slag and finish after, add lime according to 4.6 kg/tonnes of steel, add refining slags according to 1.6 kg/tonnes of steel, and according to 6.6 kg/tonnes of steel control quantity of slag, the oxygen level in the control molten steel is at 420PPm;
4) carry out the RH vacuum-treat, and add lime according to 2.8 kg/tonnes of steel, and according to being routinely added to refining agent or sweetening agent;
5) be sprinkled into aluminum shot according to 0.3 kg/tonne of steel at the slag surface uniform, again according to 6 meters/ton steel feeding silicon-calcium wires, and the control wire-feeding velocity is at 6.8 meter per seconds; FeO+MnO is 4.3 (wt%) in the slag; Carry out conventional soft blow;
6) tap and pour into base.
Present embodiment after testing, the calcium recovery rate is 10% in the RH vacuum oven, connects that to water the stove number be 11 stoves.
Embodiment 5
A kind of method that improves calcium recovery rate in the RH vacuum oven, its step:
1) carrying out molten iron processes;
2) carry out converter smelting;
3) in the LF stove, carry out refining:
A, carry out Argon, argon blowing time 2.5 minutes, and adopt the positive pressure operation, namely pressure is higher than environmental stress and gets final product;
B, change slag, change the slag time to be controlled at 10 minutes;
C, change slag and finish after, add lime according to 5 kg/tonnes of steel, add refining slags according to 2 kg/tonnes of steel, and according to 7 kg/tonnes of steel control quantity of slag, the oxygen level in the control molten steel is at 410PPm;
4) carry out the RH vacuum-treat, and add lime according to 3 kg/tonnes of steel, and according to being routinely added to refining agent or sweetening agent;
5) be sprinkled into aluminum shot according to 0.4 kg/tonne of steel at the slag surface uniform, again according to 5.7 meters/ton steel feeding silicon-calcium wires, and the control wire-feeding velocity is at 6 meter per seconds; FeO+MnO is 4.6 (wt%) in the slag; Carry out conventional soft blow;
6) tap and pour into base.
Present embodiment after testing, the calcium recovery rate is 11.5% in the RH vacuum oven, connects that to water the stove number be 12 stoves.
If when slag produces the crust phenomenon, can add the iron calcium line according to 0.70~1.4 meter/ton steel and carry out broken shell.
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.

Claims (2)

1. method that improves calcium recovery rate in the RH vacuum oven, its step:
1) carrying out molten iron processes;
2) carry out converter smelting;
3) in the LF stove, carry out refining:
A, carry out Argon, argon blowing time is not less than 1 minute, and adopts the positive pressure operation, and namely pressure is higher than environmental stress and gets final product;
B, change slag, change the slag time to be controlled at 3~10 minutes;
C, change slag and finish after, add lime according to 3.3~5.0 kg/tonnes of steel, add refining slag according to 0.67~2.0 kg/tonne of steel, and according to 6.0~7.0 kg/tonnes of steel control quantity of slag, the O content in the control molten steel is at 350~450PPm;
4) carry out the RH vacuum-treat, and add lime according to 2.0~3.0 kg/tonnes of steel, and according to being routinely added to refining agent or sweetening agent;
5) be sprinkled into aluminum shot according to 0.1~0.5 kg/tonne of steel at the slag surface uniform, again according to 4.0~6.0 meters/ton steel feeding silicon-calcium wires, and the control wire-feeding velocity is not less than 5 meter per seconds; FeO+MnO≤5.5 (wt%) in the control slag; Carry out conventional soft blow;
6) tap and pour into base.
2. a kind of method that improves calcium recovery rate in the RH vacuum oven as claimed in claim 1 is characterized in that: when slag produces the crust phenomenon, adopt to add the iron calcium line and carry out broken shell, the iron calcium line adds according to 0.70~1.4 meter/ton steel control.
CN201210377188.2A 2012-10-08 2012-10-08 Method for improving calcium yield of RH vacuum furnace Expired - Fee Related CN102876851B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210377188.2A CN102876851B (en) 2012-10-08 2012-10-08 Method for improving calcium yield of RH vacuum furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210377188.2A CN102876851B (en) 2012-10-08 2012-10-08 Method for improving calcium yield of RH vacuum furnace

Publications (2)

Publication Number Publication Date
CN102876851A true CN102876851A (en) 2013-01-16
CN102876851B CN102876851B (en) 2014-10-15

Family

ID=47478361

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210377188.2A Expired - Fee Related CN102876851B (en) 2012-10-08 2012-10-08 Method for improving calcium yield of RH vacuum furnace

Country Status (1)

Country Link
CN (1) CN102876851B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103695597A (en) * 2013-12-11 2014-04-02 首钢总公司 Molten steel calcium treatment process adopting pure calcium line
CN107541580A (en) * 2017-08-25 2018-01-05 武汉钢铁有限公司 The inclusion control method of Hot Rolling Automobile steel is smelted in CSP producing lines
CN111575446A (en) * 2020-06-25 2020-08-25 江苏省沙钢钢铁研究院有限公司 RH vacuum calcification furnace process treatment method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000129336A (en) * 1998-10-30 2000-05-09 Kawasaki Steel Corp Melting method for high cleanliness steel
KR100553609B1 (en) * 1999-11-15 2006-02-22 주식회사 포스코 A manufacturing method of steel plate for api steel pipe
CN101462155A (en) * 2007-12-21 2009-06-24 首钢总公司 Method for producing ultra-low carbon wire by small square billet continuous casting
CN101545067A (en) * 2009-05-15 2009-09-30 首钢总公司 Method for producing pipe line steel J55 by RH refining technology
CN101935738A (en) * 2010-06-01 2011-01-05 山西太钢不锈钢股份有限公司 Method for feeding silico-calcium core-spun yarn
CN102634638A (en) * 2012-04-16 2012-08-15 东北大学 Calcium treatment process of rod wire alloy steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000129336A (en) * 1998-10-30 2000-05-09 Kawasaki Steel Corp Melting method for high cleanliness steel
KR100553609B1 (en) * 1999-11-15 2006-02-22 주식회사 포스코 A manufacturing method of steel plate for api steel pipe
CN101462155A (en) * 2007-12-21 2009-06-24 首钢总公司 Method for producing ultra-low carbon wire by small square billet continuous casting
CN101545067A (en) * 2009-05-15 2009-09-30 首钢总公司 Method for producing pipe line steel J55 by RH refining technology
CN101935738A (en) * 2010-06-01 2011-01-05 山西太钢不锈钢股份有限公司 Method for feeding silico-calcium core-spun yarn
CN102634638A (en) * 2012-04-16 2012-08-15 东北大学 Calcium treatment process of rod wire alloy steel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
张才贵等: "浇铸钙处理钢水堵水口原因分析及工艺改进", 《炼钢》, vol. 23, no. 1, 28 February 2007 (2007-02-28) *
李强等: "X80管线钢LF-RH二次精炼过程夹杂物行为及控制", 《特殊钢》, vol. 32, no. 4, 31 August 2011 (2011-08-31), pages 26 - 30 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103695597A (en) * 2013-12-11 2014-04-02 首钢总公司 Molten steel calcium treatment process adopting pure calcium line
CN107541580A (en) * 2017-08-25 2018-01-05 武汉钢铁有限公司 The inclusion control method of Hot Rolling Automobile steel is smelted in CSP producing lines
CN111575446A (en) * 2020-06-25 2020-08-25 江苏省沙钢钢铁研究院有限公司 RH vacuum calcification furnace process treatment method

Also Published As

Publication number Publication date
CN102876851B (en) 2014-10-15

Similar Documents

Publication Publication Date Title
CN100465291C (en) Production tech. of low carbon low silicon aluminium killed steel
CN103334050B (en) Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel
CN102329917B (en) Production method of clean steel
CN105018855B (en) Method for producing circular sulfur-resistant pipeline steel billet for oil and gas collection and transmission
CN102994871B (en) Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron
CN102851447B (en) Outside-furnace refining production method of steel used in carbon steel welding wire
CN103008594A (en) Method for removing transverse corner cracks of extremely thick continuous casting billet
CN107841687B (en) A kind of smelting process of ultralow boron steel
CN103436654A (en) Low-cost production method for container steel casting blanks
CN103540711B (en) Method for simultaneously removing sulfur and phosphorus from semi-steel
CN102876851B (en) Method for improving calcium yield of RH vacuum furnace
CN103667581A (en) Low-nitrogen SWR82B steel smelting method
CN104498672A (en) Method for desulfurizing molten iron
CN105385811A (en) Production method for steel containing aluminum
CN108913836A (en) The production method of welding rod steel H08A
CN103014241A (en) Control method of smelting slag of SPHD steel for LF (Ladle Furnace) furnace
CN106702087A (en) Deoxidation process for H08 steel-grade silicon
CN102329918B (en) Widely applicable melting technology of free cutting steel containing lead
CN102051439B (en) Method for smelting high aluminium steel
CN106148631A (en) A kind of method of converter smelting low-sulfur ultralow nitrogen molten steel
CN103060523B (en) Smelting method for non-magnetic stainless steel
CN107630121A (en) A kind of method for preventing carbon aluminium-killed steel from producing upwarping defect
CN106811573A (en) Improve the manufacture method of the steel of molten steel casting properties
CN110106304A (en) The converter smelting method of ultralow nitrogen IF steel
CN102277471B (en) Manufacturing method of steel

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
TR01 Transfer of patent right

Effective date of registration: 20170711

Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2

Patentee after: Wuhan iron and Steel Company Limited

Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang

Patentee before: Wuhan Iron & Steel (Group) Corp.

Effective date of registration: 20170711

Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2

Patentee after: Wuhan iron and Steel Company Limited

Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang

Patentee before: Wuhan Iron & Steel (Group) Corp.

TR01 Transfer of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141015

Termination date: 20201008

CF01 Termination of patent right due to non-payment of annual fee