CN109554517A - A kind of method of billet caster production titaniferous ferritic stainless steel small billet - Google Patents
A kind of method of billet caster production titaniferous ferritic stainless steel small billet Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C—CHEMISTRY; METALLURGY
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
- C21C7/076—Use of slags or fluxes as treating agents
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
The invention discloses a kind of methods of billet caster production titaniferous ferritic stainless steel small billet, and the method includes AOD finishing slags, and quenched, LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure.The present invention, which uses AOD finishing slag quenched to make refining slag for LF furnace, lays good basis, and LF furnace high alkalinity matches TiO2Refining slag inhibits titanium type impurity to be precipitated, LF furnace improves titanium nitride saturation melting degree and titanium ingredient stability with titanium technology, billet caster continuous casting inhibits TiN to be precipitated, stabilizes titanium elements absorptivity using covering agent technology in high alkalinity, conticaster casting process TiN is shortened using the fast pull technology of high temperature, the time is precipitated, to avoid conticaster wadding stream, slab slag inclusion problem, so that billet caster be enable smoothly to cast titaniferous ferritic stainless steel small billet.Titaniferous ferritic stainless steel small billet qualification rate >=97% of the present invention, it is ensured that the surface quality of wire rod rolling.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of billet caster production titaniferous ferritic stainless steel is small
The method of square billet.
Background technique
Ferritic stainless steel is processed into component surface light because corrosion resistance is preferable, is widely used in the row such as household electrical appliances, automobile
Industry, titanium elements, which are added, in ferritic stainless steel can refine crystal grain and further increase its corrosion resistance.
For titaniferous ferrite because containing certain titanium, aluminium element, titanium elements are vivaciously easily anti-with oxygen in molten steel, LF furnace refining slag
Titanium should be caused to lose, keep titanium elements alloying inaccurate, this needs repeatedly to match titanium alloy, if making at field trash with titanium alloy compared with party
It is short to manage the time, to increase billet caster wadding stream risk；Titaniferous ferritic stainless steel molten steel always contains in smelting process
There is certain nitrogen, nitrogen reacts the titanium nitride generated with titanium certain saturation melting degree in steel, and saturation melts
Degree has relationship with liquid steel temperature, each element content, and nitridation Ti content is more than and is saturated melting degree and can be precipitated to lead to small side in molten steel
Billet continuous casting machine wadding stream；Titaniferous ferritic stainless steel molten steel viscosity is high, Control of inclusions difficulty is big, and billet caster production is because disconnected
Face is small, and molten steel causes casting difficult in now the tundish difference, and slag inclusion easily occurs in slab.
At present both at home and abroad production titaniferous ferritic stainless steel enterprise using molding, slab production, the above production method or
(molding) at high cost or restriction is formed to steel rolling rolling specs (slab).
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of billet casters to produce the small side of titaniferous ferritic stainless steel
The method of base.The invention makes refining slag for LF furnace and lays good basis by the way that AOD finishing slag is quenched, and LF furnace high alkalinity matches TiO2Refining
Slag inhibits titanium type impurity to be precipitated, and LF furnace improves titanium nitride saturation melting degree and titanium ingredient stability with titanium technology, and small billet connects
Casting machine inhibits TiN to be precipitated using covering agent in high alkalinity, and the fast pull technology of high temperature shortens TiN precipitation process, it is ensured that it casts smoothly,
To enable billet caster smoothly to cast titaniferous ferritic stainless steel small billet, qualification rate is up to 97% or more, it is ensured that line
The surface quality of material rolling.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of billet caster produces titaniferous
The method of ferritic stainless steel small billet, the method includes AOD finishing slags, and quenched, LF furnace high alkalinity matches TiO2Refining slag, LF furnace
With titanium, billet caster continuous casting working procedure, specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction finishes and pulls out reducing slag, stay slag Weight control≤
20kg/t steel lifts furnace after skimming, and aluminium block is added into furnace, while adding lime, makes finishing slag dual alkalinity CaO/SiO2≥
2.5；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2, bauxite, lime, make LF furnace refining slag dual alkalinity CaO/
SiO2≥4.0；In the refining slag, TiO2Mass fraction >=5%, Al2O3Mass fraction 10~15%, in LF clinker material with addition of
TiO2Ti in steel is inhibited to react with oxonium ion；
(3) LF furnace matches titanium: tundish temperature minimum is 1560 DEG C, and titaniferous ferritic stainless steel is first according to component requirements with addition of except titanium
Other elements in addition, according in steel with addition of each element titanium, nitrogen activity are influenced, so that it is determined that titanium contains in LF furnace with addition of highest
Amount, titanium concentration is by steel grade number requirement upper limit value；According in steel with addition of each element titanium, nitrogen activity are influenced to calculate TiN
Be saturated melting degree, so that it is determined that titanium in LF furnace with addition of highest content, with this prevent it is subsequent add titanium, cast to avoid conticaster
Journey wadding stream, slab slag inclusion；
(4) billet caster continuous casting: billet caster continuous casting is obtained using covering agent and the fast pull technology of high temperature in high alkalinity
To titaniferous ferritic stainless steel small billet.
Step (1) of the present invention lifts furnace after skimming, and 1.7~2.5kg/t of aluminium block steel is added into furnace, adds simultaneously
Lime 4~5kg/t steel.
Step (2) LF furnace of the present invention adds TiO21.0~1.7kg/t steel, bauxite 0.8~1.7kg/t steel, lime 4
~5kg/t steel.
Titanium is in LF furnace with addition of highest content calculation formula in step (3) of the present invention are as follows: [Ti%]Target≤10(5.98 - lgfTi-lgfN-16147/T-lg [N%])-0.03%。
Titanium target content before LF furnace soft blow are as follows:
[Ti%]Target≤10(5.98-lgfTi-lgfN-16147/T-lg [N%])- 0.03% (1)
Wherein:
T is billet caster Metal in Tundish minimum temperature, unit: k；
lgfTi, lgfN activity coefficient and temperature T relationship calculate by general equation:
lgfTi=(2557/T-0.365) * lgfTi(1873K)(2)
LgfN=(3280/T-0.75) * lgfN (1873K)(3)
Element activity coefficient is calculated by conventionally calculation formula in molten steel when 1873k:
lgfI(1873k)=Σ (ej I(1873k)[j%])+Σ (τj I(1873k)[j%]2) (4)
Each element interaction coefficient e in 1 molten steel of tablej I(1873k)And τj I(1873k)
Note: when calculating, titanium concentration is by steel grade number requirement upper limit value；
Covering agent dual alkalinity CaO/SiO in step (4) high alkalinity of the present invention2>=5.0, Al2O3Content 30~40%, with
Avoid Ti and SiO2Reaction causes wadding to flow.
The fast pull technology of step (4) high temperature of the present invention, i.e. 1560~1575 DEG C of tundish temperature, the conticaster casting degree of superheat
>=65 DEG C, 1.5~1.7m/min of casting rate.
Step (4) billet caster section side length 150mm*150mm of the present invention.
Step (4) titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage of the present invention
Are as follows: C≤0.06%, Si≤1.0%, Mn≤1.0%, P≤0.035%, S≤0.030%, Cr:16.50~19.0%, Ti:0.11~
0.25%, Al≤0.035%, Ni≤0.60%, N≤0.025%, surplus are Fe and inevitable impurity.
Titaniferous ferritic stainless steel small billet slag inclusion rate≤3% of the method for the invention production.
Titaniferous ferritic stainless steel small billet detection method canonical reference " YB/T 2011-2014 continuous casting steel machine of the present invention
Square billet and rectangular bloom ".
The beneficial effects of adopting the technical scheme are that the 1, present invention is quenched using AOD finishing slag, LF furnace is high-alkali
Degree matches TiO2Refining slag, LF furnace inhibit TiN to be precipitated with covering agent technology in titanium, high alkalinity, it is therefore prevented that wadding stream stabilizes small
Billet caster casting direct motion and titanium elements absorptivity.2, the present invention shortens conticaster casting process using the fast pull technology of high temperature
The time is precipitated in TiN, to avoid conticaster wadding stream, slab slag inclusion problem, contains so that billet caster be enable smoothly to cast
Titanium ferritic stainless steel small billet, titaniferous ferritic stainless steel small billet qualification rate >=97%, it is ensured that the surface matter of wire rod rolling
Amount.
Detailed description of the invention
Fig. 1 is the titaniferous ferritic stainless steel small billet surface quality figure of embodiment 1；
Fig. 2 is the titaniferous ferritic stainless steel small billet coarse micro-grain sample figure after 1 pickling of embodiment；
Fig. 3 is the titaniferous ferritic stainless steel small billet surface quality figure of comparative example 1；
Fig. 4 is the titaniferous ferritic stainless steel small billet coarse micro-grain sample figure after 1 pickling of comparative example.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.055%, Mn:
0.20%, Si:0.60%, P:0.023%, S:0.001%, Cr:17.1%, Ni:0.10%, Al:0.02%, N:0.0138%, Ti:
0.17%, remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction, which finishes, pulls out reducing slag, and slag Weight control is stayed to exist
17kg/t steel lifts furnace after skimming, and aluminium block 1.7kg/t steel is added into furnace, while adding lime 4kg/t steel, makes finishing slag two
First basicity CaO/SiO2: 2.6；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.7kg/t steel, bauxite 1.7kg/t steel, stone
Grey 4.16kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 4.1, in refining slag: TiO2: 5.7%, Al2O3: 12%；
(3) LF furnace matches titanium: 1560 DEG C of minimum tundish temperature, with each element content (wt%) before titanium: C:0.055%, Mn:0.20%,
Si:0.60%, P:0.023%, S:0.001%, Cr:17.1%, Ni:0.10%, Al:0.02%, N:0.0138% use mentioned component
Formula (4) calculate 1873k when Ti, N element activity coefficient, i.e. lgfTi(1873)、lgfN(1873)；Respectively by lgfTi(1873)、
lgfN(1873)Formula (2), (3) are substituted into, T is 1560 DEG C of minimum tundish temperature (i.e. 1833k) in formula, calculates to obtain lgfTi、
lgfN；By lgfTi、lgfN[Ti%] can be obtained by substituting into formula (1)Target；It is same that specific calculated result is shown in Table 2(other embodiments calculating process
This, therefore omit.)
Calculate TiN up to saturation solubility when Ti content be≤0.17%, it is practical to molten steel with addition of Ti content to 0.17%, then into
Row soft blow；
LF furnace is with addition of Ti content before 2 soft blow of table
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 5.0, Al2O3: 38%；Using the fast pull technology of high temperature, 1560~1570 DEG C of tundish temperature, conticaster is poured
68 DEG C of the degree of superheat of casting, casting rate 1.5m/min obtains titaniferous ferritic stainless steel small billet.
Titaniferous ferritic stainless steel small billet qualification rate 100%, titaniferous ferritic stainless steel small billet table obtained by the present embodiment
Face Quality Map is shown in Fig. 1；Titaniferous ferritic stainless steel small billet coarse micro-grain sample after pickling is shown in Fig. 2.(embodiment 2-5 attached drawing and reality
It is similar to apply example 1, therefore omits.)
Embodiment 2
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.05%, Mn:
0.9%, Si:0.42%, P:0.020%, S:0.001%, Cr:17.28%, Ni:0.23%, Al:0.03%, N:0.012%, Ti:
0.19%, remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction, which finishes, pulls out reducing slag, and slag Weight control is stayed to exist
20kg/t steel lifts furnace after skimming, and aluminium block 2.5kg/t steel is added into furnace, while adding lime 5kg/t steel, makes finishing slag two
First basicity CaO/SiO2: 2.97；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.33kg/t steel, bauxite 1.33kg/t steel,
Lime 4.5kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 4.3, in refining slag: TiO2: 5.5%, Al2O3: 13%；
(3) LF furnace matches titanium: minimum 1560 DEG C of tundish temperature, calculate before LF furnace soft blow titanium target content be≤0.205%, it is practical
To molten steel with addition of Ti content to 0.19%, soft blow is then carried out；
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 6.3, Al2O3: 31%；Using the fast pull technology of high temperature, 1560~1570 DEG C of tundish temperature, conticaster is poured
66 DEG C of the degree of superheat of casting, casting rate 1.6m/min obtains titaniferous ferritic stainless steel small billet.
Titaniferous ferritic stainless steel small billet slag inclusion rate 2% obtained by the present embodiment.
Embodiment 3
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.03%, Mn:
0.45%, Si:0.35%, P:0.017%, S:0.004%, Cr:17.10%, Ni:0.10%, Al:0.025%, N:0.017%, Ti:
0.14%, remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction, which finishes, pulls out reducing slag, and slag Weight control is stayed to exist
17kg/t steel lifts furnace after skimming, and aluminium block 2.5kg/t steel is added into furnace, while adding lime 4kg/t steel, makes finishing slag two
First basicity CaO/SiO2: 2.5；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.03kg/t steel, bauxite 1.7kg/t steel, stone
Grey 4kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 4.6, in refining slag: TiO2: 5.6%, Al2O3: 15%；
(3) LF furnace matches titanium: minimum 1560 DEG C of tundish temperature, calculate before LF furnace soft blow titanium target content be≤0.141%, it is practical
To molten steel with addition of Ti content to 0.14%, soft blow is then carried out；
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 5.4, Al2O3: 35%；Using the fast pull technology of high temperature, 1565~1575 DEG C of tundish temperature, conticaster is poured
65 DEG C of the degree of superheat of casting, casting rate 1.7m/min obtains titaniferous ferritic stainless steel small billet.
Titaniferous ferritic stainless steel small billet slag inclusion rate 1.5% obtained by the present embodiment.
Embodiment 4
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.02%, Si:
0.25%, Mn:0.97%, P:0.030%, S:0.010%, Cr:16.6%, Ti:0.20%, Al:0.033%, N:0.011%, Ni:
0.55%, remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction, which finishes, pulls out reducing slag, and slag Weight control is stayed to exist
18kg/t steel lifts furnace after skimming, and aluminium block 2kg/t steel is added into furnace, while adding lime 4kg/t steel, makes finishing slag binary
Basicity CaO/SiO2: 2.52；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.0kg/t steel, bauxite 0.83kg/t steel, stone
Grey 4kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 4.0, in refining slag: TiO2: 5%, Al2O3: 10%；
(3) LF furnace matches titanium: minimum 1560 DEG C of tundish temperature, calculate before LF furnace soft blow titanium target content be≤0.218%, it is practical
To molten steel with addition of Ti content to 0.20%, soft blow is then carried out；
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 5.4, Al2O3: 30%；Using the fast pull technology of high temperature, 1560~1570 DEG C of tundish temperature, conticaster is poured
67 DEG C of the degree of superheat of casting, casting rate 1.7m/min obtains titaniferous ferritic stainless steel small billet.
Titaniferous ferritic stainless steel small billet slag inclusion rate 1% obtained by the present embodiment.
Embodiment 5
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.04%, Si:
0.95%, Mn:0.2%, P:0.018%, S:0.020%, Cr:16.7%, Ti:0.11%, Al:0.03%, N:0.0165%, Ni:0.1%,
Remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction is finished except reducing slag, stays slag Weight control in 19kg/t
Steel lifts furnace after skimming, and aluminium block 2kg/t steel is added into furnace, while adding lime 4.5kg/t steel, makes finishing slag dual alkalinity
CaO/SiO2: 2.6；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.2kg/t steel, bauxite 0.80kg/t steel, stone
Grey 5kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 4.7, in refining slag: TiO2: 5.2%, Al2O3: 12%；
(3) LF furnace matches titanium: minimum 1560 DEG C of tundish temperature, calculate before LF furnace soft blow titanium target content be≤0.113%, it is practical
To molten steel with addition of Ti content to 0.11%, soft blow is then carried out；
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 5.6, Al2O3: 40%；Using the fast pull technology of high temperature, 1563-1575 DEG C of tundish temperature, conticaster is cast
70 DEG C of the degree of superheat, casting rate 1.7m/min obtains titaniferous ferritic stainless steel small billet.
Titaniferous ferritic stainless steel small billet slag inclusion rate 2.5% obtained by the present embodiment.
Embodiment 6
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.06%, Si:
0.80%, Mn:0.60%, P:0.035%, S:0.015%, Cr:18.3%, Ti:0.25%, Al:0.010%, N:0.025%, Ni:
0.16%, remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction, which finishes, pulls out reducing slag, and slag Weight control is stayed to exist
15kg/t steel lifts furnace after skimming, and aluminium block 1.9kg/t steel is added into furnace, while adding lime 4.3kg/t steel, makes finishing slag
Dual alkalinity CaO/SiO2: 3.2；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.5kg/t steel, bauxite 1.1kg/t steel, stone
Grey 4.2kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 5.0, in refining slag: TiO2: 8%, Al2O3: 13%；
(3) LF furnace matches titanium: minimum 1560 DEG C of tundish temperature, calculate before LF furnace soft blow titanium target content be≤0.251%, it is practical
To molten steel with addition of Ti content to 0.25%, soft blow is then carried out；
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 6.0, Al2O3: 32%；Using the fast pull technology of high temperature, 1560~1568 DEG C of tundish temperature, conticaster is poured
75 DEG C of the degree of superheat of casting, casting rate 1.6m/min.
Titaniferous ferritic stainless steel small billet slag inclusion rate 3.0% obtained by the present embodiment.
Embodiment 7
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.028%, Si:
0.64%, Mn:0.76%, P:0.018%, S:0.030%, Cr:16.50%, Ti:0.22%, Al:0.035%, N:0.015%, Ni:
0.27%, remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction, which finishes, pulls out reducing slag, and slag Weight control is stayed to exist
17kg/t steel lifts furnace after skimming, and aluminium block 2.2kg/t steel is added into furnace, while adding lime 4.6kg/t steel, makes finishing slag
Dual alkalinity CaO/SiO2: 3.5；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.5kg/t steel, bauxite 1.4kg/t steel, stone
Ash 4,7kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 5.3, in refining slag: TiO2: 7.3%, Al2O3: 14%；
(3) LF furnace matches titanium: minimum 1560 DEG C of tundish temperature, calculate before LF furnace soft blow titanium target content be≤0.224%, it is practical
To molten steel with addition of Ti content to 0.22%, soft blow is then carried out；
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 5.9, Al2O3: 37%；Using the fast pull technology of high temperature, 1566~1575 DEG C of tundish temperature, conticaster is poured
73 DEG C of the degree of superheat of casting, casting rate 1.65m/min obtains titaniferous ferritic stainless steel small billet.
Titaniferous ferritic stainless steel small billet slag inclusion rate 1.2% obtained by the present embodiment.
Embodiment 8
The present embodiment titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.046%, Si:
1.0%, Mn:1.0%, P:0.023%, S:0.012%, Cr:19.0%, Ti:0.20%, Al:0.027%, N:0.022%, Ni:0.60%,
Remaining is iron and inevitable impurity.
The present embodiment billet caster production titaniferous ferritic stainless steel small billet method include AOD finishing slag it is quenched,
LF furnace high alkalinity matches TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, and specific process step is as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction, which finishes, pulls out reducing slag, and slag Weight control is stayed to exist
18kg/t steel lifts furnace after skimming, and aluminium block 2.1kg/t steel is added into furnace, while adding lime 4.8kg/t steel, makes finishing slag
Dual alkalinity CaO/SiO2: 2.5；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2(titanium dioxide) 1.4kg/t steel, bauxite 1.1kg/t steel, stone
Grey 4.3kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 4.2, in refining slag: TiO2: 5.6%, Al2O3: 12.5%；
(3) LF furnace matches titanium: minimum 1560 DEG C of tundish temperature, calculate before LF furnace soft blow titanium target content be≤0.186%, it is practical
To molten steel with addition of Ti content to 0.18%, soft blow is then carried out；
(4) billet caster continuous casting: billet caster section side length 150mm*150mm, using covering agent in high alkalinity,
Dual alkalinity CaO/SiO2: 5.7, Al2O3Content 34%；Using the fast pull technology of high temperature, 1562~1671 DEG C of tundish temperature, conticaster
67 DEG C of the degree of superheat of casting, casting rate 1.55m/min obtains titaniferous ferritic stainless steel small billet.
Titaniferous ferritic stainless steel small billet slag inclusion rate 2.3% obtained by the present embodiment.
Comparative example 1
This comparative example titaniferous ferritic stainless steel small billet chemical component composition and its mass percentage are as follows: C:0.025%, Mn:
0.25%, Si:0.67%, P:0.019%, S:0.001%, Cr:17.23%, Ni:0.23%, Al:0.023%, N:0.014%, Ti:
0.23%, remaining is iron and inevitable impurity；1497 DEG C of liquidus temperature.
This comparative example titaniferous ferritic stainless steel small billet production method the following steps are included:
(1) AOD uses 20kg/t steel ferrosilicon deoxidation alloying, and slag 30kg/t steel, finishing slag dual alkalinity CaO/ are stayed after normally skimming
SiO2: 2.0；
(2) LF adds lime 2kg/t steel, LF furnace refining slag dual alkalinity CaO/SiO2: 2.8, TiO2Content: 3.6%, Al2O3: 5%；
(3) Ti content 0.23% before LF soft blow, calculating highest by the present invention should be 0.164%；
(4) covering agent is conventional low alkalinity coverture, dual alkalinity CaO/SiO in2: 2, Al2O3: 10%；
(5) 1540~1560 DEG C of tundish temperature, pulling rate 1.2m/min.
It is produced by above-mentioned common process, conticaster wadding stream is serious, continuous casting billet qualification rate 0%, and casting billet surface slag inclusion is serious and nothing
Method is removed by reconditioning finishing, and slab low power subcrack is serious.Cc billet surface quality figure is shown in Fig. 3；Slab low power after pickling
Sample is shown in Fig. 4.
Pass through Fig. 1,3 and Fig. 2,4 comparisons, it will thus be seen that the titaniferous ferritic stainless steel using the method for the present invention production connects
Casting billet surface does not find slag inclusion, and continuous casting billet low power is without subcrack.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of method of billet caster production titaniferous ferritic stainless steel small billet, which is characterized in that the method packet
Include that AOD finishing slag is quenched, LF furnace high alkalinity is with TiO2Refining slag, LF furnace match titanium, billet caster continuous casting working procedure, concrete technology step
It is rapid as described below:
(1) AOD finishing slag is quenched: dephosphorization molten iron is smelted through AOD, and AOD reduction finishes and pulls out reducing slag, stay slag Weight control≤
20kg/t steel lifts furnace after skimming, and aluminium block is added into furnace, while adding lime, makes finishing slag dual alkalinity CaO/SiO2≥
2.5；
(2) LF furnace high alkalinity matches TiO2Refining slag: LF furnace adds TiO2, bauxite, lime, make LF furnace refining slag dual alkalinity CaO/
SiO2≥4.0；In the refining slag, TiO2Mass fraction >=5%, Al2O3Mass fraction 10~15%；
(3) LF furnace matches titanium: tundish temperature minimum is 1560 DEG C, and titaniferous ferritic stainless steel is first according to component requirements with addition of except titanium
Other elements in addition, according in steel with addition of each element titanium, nitrogen activity are influenced, so that it is determined that titanium contains in LF furnace with addition of highest
Amount, titanium concentration is by steel grade number requirement upper limit value；
(4) billet caster continuous casting: billet caster continuous casting is obtained using covering agent and the fast pull technology of high temperature in high alkalinity
To titaniferous ferritic stainless steel small billet.
2. a kind of method of billet caster production titaniferous ferritic stainless steel small billet according to claim 1,
It is characterized in that, the step (1) lifts furnace after skimming, and 1.7~2.5kg/t of aluminium block steel is added into furnace, while adding lime 4
~5kg/t steel.
3. a kind of method of billet caster production titaniferous ferritic stainless steel small billet according to claim 1,
It is characterized in that, step (2) the LF furnace adds TiO21.0~1.7kg/t steel, bauxite 0.8~1.7kg/t steel, 4~5kg/ of lime
T steel.
4. a kind of billet caster according to claim 1 to 3 produces titaniferous ferritic stainless steel small billet
Method, which is characterized in that titanium is in LF furnace with addition of highest content calculation formula in the step (3) are as follows: [Ti%]Target≤10(5.98 - lgfTi-lgfN-16147/T-lg [N%])-0.03%。
5. a kind of billet caster according to claim 1 to 3 produces titaniferous ferritic stainless steel small billet
Method, which is characterized in that covering agent dual alkalinity CaO/SiO in step (4) high alkalinity2>=5.0, Al2O3Content 30
~40%.
6. a kind of billet caster according to claim 1 to 3 produces titaniferous ferritic stainless steel small billet
Method, which is characterized in that the fast pull technology of step (4) high temperature, i.e. 1560~1575 DEG C of tundish temperature, conticaster was cast
Temperature >=65 DEG C, 1.5~1.7m/min of casting rate.
7. a kind of billet caster according to claim 1 to 3 produces titaniferous ferritic stainless steel small billet
Method, which is characterized in that step (4) the billet caster section side length 150mm*150mm.
8. a kind of billet caster according to claim 1 to 3 produces titaniferous ferritic stainless steel small billet
Method, which is characterized in that step (4) titaniferous ferritic stainless steel small billet chemical component composition and its quality percentage contain
Amount are as follows: C≤0.06%, Si≤1.0%, Mn≤1.0%, P≤0.035%, S≤0.030%, Cr:16.50~19.0%, Ti:0.11~
0.25%, Al≤0.035%, Ni≤0.60%, N≤0.025%, surplus are Fe and inevitable impurity.
9. a kind of billet caster according to claim 1 to 3 produces titaniferous ferritic stainless steel small billet
Method, which is characterized in that the method production titaniferous ferritic stainless steel small billet slag inclusion rate≤3%.
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| CN110982982A (en) * | 2019-11-13 | 2020-04-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | LF refining method of titanium-containing austenitic stainless steel |
| CN113699313A (en) * | 2021-09-02 | 2021-11-26 | 宝钢德盛不锈钢有限公司 | Smelting process of titanium-containing stainless steel |
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| CN101294260A (en) * | 2007-04-24 | 2008-10-29 | 宝山钢铁股份有限公司 | High-strength stainless cold-rolled steel strip and method for manufacturing same |
| CN106282832A (en) * | 2016-08-06 | 2017-01-04 | 山东泰山钢铁集团有限公司 | Hot-metal bottle dephosphorization, refining furnace and Argon station smelt titaniferous ferritic stainless steel method |
| CN106834607A (en) * | 2017-01-19 | 2017-06-13 | 北京科技大学 | A kind of fining process for improving ferrite stainless steel continuous casting billet proportion of equiaxed grain |
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| CN101294260A (en) * | 2007-04-24 | 2008-10-29 | 宝山钢铁股份有限公司 | High-strength stainless cold-rolled steel strip and method for manufacturing same |
| CN106282832A (en) * | 2016-08-06 | 2017-01-04 | 山东泰山钢铁集团有限公司 | Hot-metal bottle dephosphorization, refining furnace and Argon station smelt titaniferous ferritic stainless steel method |
| CN106834607A (en) * | 2017-01-19 | 2017-06-13 | 北京科技大学 | A kind of fining process for improving ferrite stainless steel continuous casting billet proportion of equiaxed grain |
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