CN104726788A - Method of Manufacturing Ti-Containing Austenitic Stainless Steel Sheet by Twin Roll Strip Caster - Google Patents

Method of Manufacturing Ti-Containing Austenitic Stainless Steel Sheet by Twin Roll Strip Caster Download PDF

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Publication number
CN104726788A
CN104726788A CN201410805551.5A CN201410805551A CN104726788A CN 104726788 A CN104726788 A CN 104726788A CN 201410805551 A CN201410805551 A CN 201410805551A CN 104726788 A CN104726788 A CN 104726788A
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molten steel
tin
stainless steel
titanium
temperature
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朴晟珍
宋秉俊
李大成
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Posco Holdings Inc
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Posco Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/002—Stainless steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

There is provided a method of manufacturing a titanium (Ti)-containing austenitic stainless steel sheet having a high degree of surface quality by using a twin roll strip caster. The method includes controlling a composition of molten steel such that a TiN precipitation temperature may be higher than a temperature of the molten steel in a tundish (T/D) by at least 50 DEG C([Delta]T>=50 DEG C.), the TiN precipitation temperature being defined by the following formula 2:Log(N%)=-19,755/(T+273)+7.78+0.07[%Ti]-log [%Ti]+ 0.045[%Cr] T(DEG C.)=-19,755/log(N%)-7.78-0.07(%Ti)+log(%ti)-0.045(%Cr)-273[Formula 2].

Description

By the method for two roller strip caster manufacture containing Ti austenite stainless steel plate
the mutual reference of related application
This application claims the right of priority that the sequence number submitted on December 20th, 2013 to Korean Intellectual Property Office is the korean patent application of 10-2013-0160262, its disclosure includes this specification sheets in by the mode quoted.
Background technology
The disclosure relates to a kind of method using pair roller strip caster (twin roll strip caster) to manufacture titaniferous (Ti) austenite stainless steel plate, more specifically, relate to a kind of method containing Ti austenite stainless steel plate that manufacture has great surface quality, it by directly adopting traditional continuous casting process cast strip by molten steel in two roller strip caster, thus prevent being formed of nozzle blockage and large surface imperfection (being caused by TiN and oxide inclusion).
Titaniferous (Ti) austenitic stainless steel has the high Ti content of about 0.2% to about 0.5%, and, if generally to cast process casting continuously containing the austenitic stainless steel of Ti, likely form nitride or the oxide compound of Ti.The nitride of known this Ti and hopcalite can cause the immersion nozzle of ladle or tundish to block.
In addition, the large cluster formed by the nitride of Ti causes many surface imperfection, and therefore, major part can experience an aftertreatment containing the steel plate of Ti, as carried out course of hot rolling after its up/down surface of grinding.If this defect is retained on the coiled material of hot rolling, then can only implement to batch process of lapping or cold-rolled process to the coiled material of described hot rolling, then obtained the finished product.Due to these reasons, add extra method cost and burden, reduce method output, thus reduce profit.Therefore, a kind of method addressed these problems is needed.
Usually, the content containing the titanium (Ti) in Ti stainless steel of improved corrosion is 0.2% to 0.5%, so that with TiC form fixed carbon, thus prevents chromium (Cr) as the important element guaranteeing stainless erosion resistance with Cr 23c 6form be precipitated out.The same with general stainless steel, obtain by using the process of electric smelter, refining furnace, Ladle Treatment unit and continuous casting machine containing Ti stainless steel.That is, in the related art, formed with the form of steel billet by Continuous casting process containing Ti stainless steel, and heat pricks this steel billet to form the band with the thickness of 2mm to 6mm.
Fig. 1 is the schematic diagram of the continuous casting process that association area is shown.As shown in Figure 1, can use the ladle 2 filling the molten steel 1 of being produced by process for making, be placed in the tundish 4 as snubber between ladle 2 and mould 8, for the production of the mould 8 of steel billet, and cooling twice platform 9 implements continuous casting process.Molten steel 1 is forming steel billet through during aforesaid device, and then this steel billet is reheated, and is bundled into band by heat in the region of box indicating in Fig. 1.Then, band water cooling is batched.
Such as, steel scrap and iron alloy are melt into molten steel in electric smelter, and by molten steel refining and therefrom except carbon elimination, p and s in refining furnace.After this, in Ladle Treatment unit, temperature and the accessory constituent of molten metal is regulated according to the condition of castingprocesses.After adjustment temperature and submember, molten steel is cast continuously and forms the coiled material product of hot rolling.
But, because titanium (Ti) has high affinity to oxygen and nitrogen, add titanium (Ti) and Ti oxide compound (such as TiO can be caused 2) and the formation of Ti nitride (such as TiN), because Ti oxide compound and Ti nitride have very high fusing point, Ti oxide compound and Ti nitride can plug nozzles reduce the surface quality of product in castingprocesses.Particularly, if nozzle blocks in castingprocesses, molten steel just can not be supplied to tundish or casting machine, therefore can not implement castingprocesses.That is, due to this kind of situation, the production of product may be interrupted.
Cause the material of spray nozzle clogging may be contained in molten steel with the form of large inclusion.In the case, the surface quality of product may be very poor.As mentioned above, if nozzle blocks in castingprocesses, quality product and production efficiency may be greatly affected.
In the related art, following methods has been proposed to prevent spray nozzle clogging.
First, a kind of method reducing titanium (Ti) content is proposed.Namely the amount of titanium (Ti) is reduced to reduce the formation of Ti oxide compound and Ti nitride.But in the case, the amount of carbon (C) also must reduce.Titanium (Ti) content is increased to more than a specific value, to obtain the anticorrosive degree of needs according to carbon (C) content containing the stainless Basic Design theory of Ti.That is, the ratio of Ti/C, is called Ti stabilization ratio, is set to about 5 to about 10, is usually at least 5.Therefore, if the interpolation of titanium (Ti) reduces, then the amount of carbon also has to reduce to meet described Ti stabilization ratio.In the case, a large amount of oxygen may be had to provide to refining furnace to reduce the amount of carbon.Therefore, a large amount of oxygen may be dissolved in molten steel, thus the formation of Ti oxide compound can be made to increase unexpectedly.In addition, the time needed due to refining process adds, and thus the temperature of molten steel can raise, and therefore, after molten steel is discharged from refining furnace, a large amount of refrigerants can be needed to cool molten steel.In the case, molten steel, when using coolant cools, can easily contact with ambient air, and therefore can be reoxidized, thus causes the formation of a large amount of inclusiones.
Secondly, reduce at another kind in the method for titanium (Ti) content, before adding titanium (Ti), add a large amount of aluminium (Al) with the avidity to oxygen relatively higher than titanium (Ti), to remove the oxygen of dissolving.The method effectively prevent the formation of Ti oxide compound.But, owing to using aluminium (Al) to remove oxygen, define a large amount of Al more adversely affecting the surface quality of product than Ti oxide compound 2o 3, therefore need to add calcium (Ca) to the process of molten steel, with by Al 2o 3be converted into the CaO-Al with less negative interaction 2o 3.But, due to the high volatility of calcium (Ca), be difficult to the content controlling calcium (Ca).In addition, if the content of calcium (Ca) is too low or too high, may can not forms the inclusion with desired shape, therefore can increase surface imperfection.Particularly, if the too high levels of calcium (Ca), then the calcium (Ca) that molten steel comprises may with the Al regulating molten steel to contain to the refractory materials the stopper of the supply of casting machine from tundish 2o 3reaction, thus form the Compound C aO-Al with low melting point 2o 3, increase the corrosion of stopper.In the case, the supply of molten steel can become unstable, thus reduces the quality of product.
Summary of the invention
An aspect of the present disclosure provides a kind of method manufacturing titaniferous (Ti) austenite stainless steel plate, it uses two roller strip caster to suppress the formation of TiN, and effectively prevent the spray nozzle clogging that occurs in general continuous casting process, thus guarantee casting stability and high product surface quality.
But aspect of the present disclosure is not limited thereto.Other aspects will partly be set forth in the description that follows, and will become clear according to described description for those of ordinary skill in the related art.
According to an aspect of the present disclosure, can provide a kind of uses two roller strap material castingprocesses manufacture to have the method for titaniferous (Ti) austenite stainless steel plate of great surface quality, the method comprises the composition controlling molten steel, make the temperature height at least 50 DEG C (Δ T >=50 DEG C) of the molten steel in the comparable tundish of TiN precipitation temperature (T/D), described TiN precipitation temperature is limited by following formula 2:
[formula 2]
Log(N％)＝-19，755/(T+273)+7.78+0.07[％Ti]-log[％Ti]+0.045[％Cr]
Molten steel can comprise, in % by weight, carbon (C): 0.025% to 0.055%, silicon (Si): 0.25% to 0.55%, manganese (Mn): 1.5% to 1.8%, chromium (Cr): 17.1% to 17.7%, nickel (Ni): 9.25% to 9.65%, titanium (Ti): 0.2% to 0.5%, nitrogen (N): less than 0.025%, and the iron of surplus (Fe) and inevitable impurity.
Molten steel can have the Ti/C ratio of more than 8.
Accompanying drawing explanation
Carry out following detailed description in conjunction with the drawings and more clearly will understand above and other aspect of the present disclosure, other advantages of characteristic sum, wherein:
Fig. 1 is the schematic diagram of the continuous casting process that association area is shown.
Fig. 2 is the schematic diagram of the strip caster illustrated according to an illustrative embodiments of the present disclosure.
Fig. 3 is the TiN+TiO of composite nitrogen oxide compound 2bunch electron photomicrograph;
Fig. 4 illustrates the surface picture of the cast material in a comparative example and the internal pictures of tundish nozzle; And
Fig. 5 illustrates the surface picture of the cast material in an embodiment of the present invention and the internal pictures of tundish nozzle.
Embodiment
Now describe illustrative embodiments of the present disclosure with reference to the accompanying drawings in detail.
But the disclosure can example in many different forms, and should not be understood to be limited to the specific embodiments set forth herein.On the contrary, provide these embodiments to be to make the disclosure comprehensively with complete, and fully will pass on the scope of the present disclosure to those of ordinary skill in the art.
In figure, for the sake of clarity, may be exaggerated the shape and size of key element, and the identical Reference numeral of use is referred to same or analogous key element in the whole text.
Fig. 2 is the schematic diagram of the two rod strip caster 100 illustrated according to an exemplary of the present disclosure.
With reference to figure 2, two roller strip caster 100 of exemplary comprise casting roll 110, ladle 120, tundish 130, immersion nozzle 140, first quarter moon guard shield (meniscus shield) 150, brush roll 160 and edge guard 170 substantially.Reference numeral 180 represents band.In the two roller strip casting process using this pair of roller strip caster, molten steel is supplied to the region between two rollers of atwirl internal water cooling in the opposite direction by injection nozzle, thus molten steel is directly cast as the band with below 10mm thickness.
An exemplary of the present disclosure provides a kind of and uses two roller strip caster to manufacture the method for titaniferous (Ti) austenite stainless steel plate.In the method, the composition of molten steel is controlled the TiN limited by following formula 2 precipitation temperature to be maintained the level of the temperature height at least 50 DEG C (Δ T) than the molten steel in tundish (T/D).
In an illustrative embodiments of the present disclosure, by using can comprising containing Ti austenite stainless steel plate of the method manufacture of two roller strip caster, in % by weight, carbon (C): 0.025% to 0.055%, silicon (Si): 0.25% to 0.55%, manganese (Mn): 1.5% to 1.8%, chromium (Cr): 17.1% to 17.7%, nickel (Ni): 9.25% to 9.65%, titanium (Ti): 0.2% to 0.5%, nitrogen (N): less than 0.025%, and the iron of surplus (Fe) and inevitable impurity.This standard consisted of known by association area containing Ti austenite stainless steel plate forms.
When the molten steel with above-mentioned composition is cast into band in two roller strap material castingprocesses, because the impact of titanium (Ti) can form multiple casting flaw.
Usually, to be trapped in the nozzle of tundish and to cause the material of blocking to be TiN and TiO 2.TiN as core or seed, TiO 2assemble around described core or seed, with bunch shape formed complex inclusion.Such as, Fig. 3 shows the TiN+TiO of composite nitrogen oxide compound 2bunch electron photomicrograph.Therefore, need to minimize TiN and precipitate (nitrides precipitate) and TiO 2formed (oxide compound formation).
The titanium (Ti) contained in molten steel and nitrogen react and form TiN inclusion.Because TiN has the high-melting-point of about 2000 DEG C, TiN particle can agglomeration be together and grow in molten steel.In the case, although the effect of TiN to spray nozzle clogging is less than TiO 2, but the surface quality of product significantly declines.Therefore, it is important for preventing from molten steel, form TiN, especially before molten steel is supplied to tundish.
Therefore, to following formula 1 represent titanium (Ti) and nitrogen (N) between TiN forming reactions carried out thermodynamic study.
[formula 1]
Ti+N＝TiN
Formula 1 is disclosed in scholarly publication.After analyzing many academic materials, the disclosure employs following formula 2, and it is considered to have expressed the actual formation containing TiN in Ti austenitic stainless steel exactly.
[formula 2]
Log(N％)＝-19，755/(T+273)+7.78+0.07[％Ti]-log[％Ti]+0.045[％Cr]
Above formula 2 have expressed TiN precipitation temperature.According to formula 2, TiN precipitation temperature is determined by the content of titanium (Ti), nitrogen (N) and chromium (Cr), further, if the content of titanium (Ti) and nitrogen (N) reduces or the content of chromium (Cr) increases, then TiN precipitation temperature reduces.That is, solidifying in the casting machine carried out, the temperature of the molten steel in tundish (T/D) must maintain higher than TiN precipitation temperature, to minimize TiN precipitation before molten steel solidification.Therefore, in order to minimize oxynitride (TiN and TiO 2) formation, may need, when by removing nitrogen (N) and preventing from introducing nitrogen (N) to minimize the content of the nitrogen (N) in refining furnace, to minimize the interpolation of titanium (Ti).
Therefore, according to an exemplary of the present disclosure, control the composition of molten steel the TiN limited by formula 2 precipitation temperature to be maintained the level of the temperature height at least 50 DEG C (Δ T) than the molten steel in tundish (T/D).
In general continuous casting process, due to bleedout (break-out) phenomenon (wherein uncured molten steel because steel billet breaks from inside steel billet bleedout), be difficult to carry out high temperature casting.But in Strip casting process, high temperature casting (more than 1550 DEG C) is possible.Therefore, the difference (Δ T) between TiN precipitation temperature and high temperature casting temp can maintain more than 50 DEG C, and TiN can be suppressed to precipitate.Therefore, can prevent from forming the TiN+TiO had by TiN Seed Development 2bunch composite nitrogen oxide compound, therefore can minimize spray nozzle clogging and surface imperfection.
In addition, according to the disclosure, by Ti stabilization ratio (Ti/C ratio) being maintained the level of more than 8, the erosion resistance of iron and steel can be ensured.In the case, if reduce the interpolation of titanium (Ti), the amount of carbon (C) also must reduce to meet Ti stabilization ratio.For this reason, a large amount of oxygen is supplied to refining furnace to reduce the amount of carbon.Therefore, a large amount of oxygen may be dissolved in molten steel, and thus the formation of the oxide compound of Ti can increase unexpectedly.In addition, the time needed due to refining process adds, and the temperature of molten steel raises, and therefore, after molten steel is discharged from refining furnace, needs a large amount of refrigerants for cooling molten steel.In the case, when using coolant cools, molten steel easily can contact with ambient air and is therefore reoxidized and causes forming a large amount of inclusiones.
Although to make a return journey de-carbon because a large amount of oxygen is supplied to refining furnace, thus a large amount of oxygen to be dissolved in molten steel and to add TiO 2the formation of oxide compound, but solidification is occurred rapidly, so TiO due to the characteristic of Strip casting process 2the size of inclusion can be little or thin, therefore TiO 2can affect less.By the TiO of TiN Seed Development 2large cluster be on nozzle and cause the representative shape of the oxide compound of surface imperfection.
Otherwise owing to eliminating a large amount of carbon (C) in refining furnace, the content of carbon (C) can be down to less than 0.3%, the interpolation of titanium (Ti) therefore can be reduced to meet Ti stabilization ratio.Therefore, precipitation and the TiO of TiN can fundamentally be reduced 2formation.
Hereinafter, by embodiment, illustrative embodiments of the present disclosure will more specifically be described.
(embodiment)
[table 1]
* the number of times (the number of times sum of upper and lower surface) of surface grinding
Use the molten steel of the composition had as shown in Table 1 obtained containing Ti austenic stainless steel belt material.In Table 1, comparative sample 1 to 3 is the band manufactured by generally casting process continuously, and invention sample 1 to 5 is the band using two roller strip caster to manufacture.TiN precipitation temperature value shown in table 1 is the value using above-mentioned formula 2 to calculate.
As shown in table 1, in general continuous casting process, if along with the increase of refining time, decarburizing reaction heat makes the temperature of molten steel increase, then due to bleedout phenomenon (band breaks), high temperature casting is impossible, after molten steel is discharged from smelting furnace, supply a large amount of refrigerants to reduce the temperature of molten steel.In the case, when using coolant cools, molten steel easily can contact with ambient air and is therefore reoxidized thus causes forming a large amount of inclusiones.In addition, because molten steel temperature reduces, implement under being cast in a temperature near TiN precipitation temperature (1490 DEG C to 1515 DEG C), thus a large amount of TiN is out precipitable.Therefore, the degree of the spray nozzle clogging in comparative sample 1 to 3 is up to more than 5mm.
In addition, due to TiN+TiO 2the complex inclusion formed makes the band by generally casting process manufacture continuously have surface imperfection, so respectively carried out the grinding of more than 4 times in the upper and lower surface of described band.Fig. 4 shows the surface picture of cast material in comparative sample and the internal pictures of tundish nozzle.
On the contrary, it is possible that two roller strip casting process makes high temperature cast (more than 1550 DEG C), and therefore, as in invention sample 1 to 5, the difference between TiN precipitation temperature and casting temp can maintain more than 50 DEG C (Δ T >=50 DEG C).Therefore, in invention sample 1 to 5, TiN can be suppressed to precipitate to prevent from being formed the TiN+TiO had by TiN Seed Development 2bunch composite nitrogen oxide compound, therefore can minimize spray nozzle clogging and surface imperfection.
That is, be understandable that, method of the present disclosure suppresses TiN precipitation with the level degree of tundish spray nozzle clogging being maintained below 1mm, therefore allows castingprocesses normally to complete.In addition, the surface quality degree containing Ti austenitic steel strip manufactured by strip casting process of the present disclosure is high, so that does not carry out surface grinding.
With reference to table 1, the invention sample 3 to 5 with the Ti/C ratio of more than 8 has higher erosion resistance than the invention sample 1 and 2 with relatively low Ti/C ratio.
Need to confirm based on containing the stainless Developed Background of Ti the object that Ti/C controls.Titanium (Ti) to be added in STS304 steel as carbon stabilizing element to reduce crystal boundary susceptibility, thus have developed for crystal boundary sensitive range (450 DEG C to 850 DEG C) containing Ti stainless steel.That is, in common stainless steel, chromium (Cr) and carbon (C) are combined into Cr 23c 6carbide, and at Cr 23c 6cr-depleted region is formed around carbide.Therefore, due to relatively low chromium (Cr) content in Cr-depleted region, Cr-depleted region is easy to be corroded.In addition, in high temperature application (500 to 800 DEG C), as in boiler heat exchanger or high-temperature pipe, due to high reactivity, corrosion occurs more quickly.Therefore, high temperature is applied, usual interpolation titanium (Ti) to stainless steel to cause the reaction between carbon (C) and titanium (Ti), and the reaction between non-carbon (C) and chromium (Cr), and be therefore fixed for chromium (Cr) element improving erosion resistance.Usually, the Ti/C of 5 to 6 is than ensureing that stainless steel has stable erosion resistance, and higher Ti/C is than ensureing that stainless steel has more stable erosion resistance.
But in the general continuous casing of association area, if improve Ti/C ratio, owing to the addition of a large amount of titaniums (Ti), the oxynitride of Ti can excessively be formed, and thus excessively can form surface imperfection.Therefore, be difficult to improve Ti/C ratio.
But in Strip casting process, although the interpolation adding titanium (Ti) is with the Ti/C ratio obtaining more than 8, the formation of Ti oxide compound and TiN precipitation can be controlled and minimize to prevent surface imperfection.Namely Ti/C ratio effectively can maintain more than 8.
As above elaboration, according to exemplary of the present disclosure, effectively can prevent the spray nozzle clogging in general continuous casting process, and the formation of TiN can be suppressed.Therefore, can ensure to cast stability, and two roller strip caster can be used to manufacture the austenite stainless steel plate containing Ti with great surface quality efficiently.
Although more than show and describe exemplary, those of ordinary skill in the art should be understood that when not deviating from the scope of the present disclosure defined by the appended claims, can make amendment and various change.

Claims (3)

1. one kind uses two roller strap material castingprocesses manufacture to have the method for titaniferous (Ti) austenite stainless steel plate of great surface quality, the method comprises the composition controlling molten steel, make the temperature height at least 50 DEG C (Δ T >=50 DEG C) of TiN precipitation temperature molten steel middle than tundish (T/D), described TiN precipitation temperature is limited by following formula 2:
[formula 2]
Log(N％)＝-19，755/(T+273)+7.78+0.07[％Ti]-log[％Ti]+0.045[％Cr]
2. the method for claim 1, wherein molten steel comprises, in % by weight, carbon (C): 0.025% to 0.055%, silicon (Si): 0.25% to 0.55%, manganese (Mn): 1.5% to 1.8%, chromium (Cr): 17.1% to 17.7%, nickel (Ni): 9.25% to 9.65%, titanium (Ti): 0.2% to 0.5%, nitrogen (N): less than 0.025%, and the iron of surplus (Fe) and inevitable impurity.
3. the process of claim 1 wherein that described molten steel has the Ti/C ratio of more than 8.
CN201410805551.5A 2013-12-20 2014-12-19 Method of Manufacturing Ti-Containing Austenitic Stainless Steel Sheet by Twin Roll Strip Caster Pending CN104726788A (en)

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KR1020130160262A KR20150072755A (en) 2013-12-20 2013-12-20 A Method of Manufacturing Stainless Steel 321 by Twin Roll Strip Caster
KR10-2013-0160262 2013-12-20

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Publication number Priority date Publication date Assignee Title
JP2623606B2 (en) * 1987-10-29 1997-06-25 住友金属工業株式会社 Manufacturing method of ferritic stainless steel
CN1269740A (en) * 1997-09-17 2000-10-11 石川岛播磨重工业株式会社 Immersion nozzle for casting steel strip
US6749700B2 (en) * 2001-02-14 2004-06-15 Hitachi Metals Ltd. Method for producing amorphous alloy ribbon, and method for producing nano-crystalline alloy ribbon with same
CN102317489A (en) * 2007-10-04 2012-01-11 住友金属工业株式会社 Austenitic stainless steel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1294228B1 (en) * 1997-08-01 1999-03-24 Acciai Speciali Terni Spa PROCEDURE FOR THE PRODUCTION OF AUSTENITIC STAINLESS STEEL BELTS, AUSTENITIC STAINLESS STEEL BELTS SO
JP4025566B2 (en) * 2002-03-27 2007-12-19 新日本製鐵株式会社 Method for producing austenitic stainless steel strip slab

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2623606B2 (en) * 1987-10-29 1997-06-25 住友金属工業株式会社 Manufacturing method of ferritic stainless steel
CN1269740A (en) * 1997-09-17 2000-10-11 石川岛播磨重工业株式会社 Immersion nozzle for casting steel strip
US6749700B2 (en) * 2001-02-14 2004-06-15 Hitachi Metals Ltd. Method for producing amorphous alloy ribbon, and method for producing nano-crystalline alloy ribbon with same
CN102317489A (en) * 2007-10-04 2012-01-11 住友金属工业株式会社 Austenitic stainless steel

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Application publication date: 20150624