CN105803347B - The excellent ferritic stainless steel of mouldability and its manufacturing method - Google Patents
The excellent ferritic stainless steel of mouldability and its manufacturing method Download PDFInfo
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- CN105803347B CN105803347B CN201410840622.5A CN201410840622A CN105803347B CN 105803347 B CN105803347 B CN 105803347B CN 201410840622 A CN201410840622 A CN 201410840622A CN 105803347 B CN105803347 B CN 105803347B
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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Abstract
The present invention provides a kind of constituent content by adjusting in the molten steel for manufacturing stainless steel, it excellent can maintain elongation percentage and the excellent ferritic stainless steel and its manufacturing method of corrosion proof mouldability, the excellent ferritic stainless steel of mouldability according to the present invention, it includes 0.001~0.005% C in terms of wt%, 0.005~0.15% N, 0.05~0.20% Si, 0.01~0.10% Mn, 0.01~0.03% P, 15~18.5% Cr, 0.01~0.10% Al, the Ti of 0.10~0.30t%, 0.01~0.10% Nb, residual F e and other inevitable impurity, and meet 0.1 < 400C+85.7N+55.6P+7.7Si+ The formula 1 of 7.3Nb < 4.4, in formula 1, C, N, P, Si and Nb refer to the content (wt%) of each component.
Description
Technical field
The present invention relates to a kind of ferritic stainless steels that mouldability is excellent and its manufacturing method more particularly to one kind to lead to
Overregulate the constituent content in the molten steel for manufacturing stainless steel, maintain excellent elongation percentage and it is corrosion proof, mouldability is excellent
Ferritic stainless steel and its manufacturing method.
Background technique
In general, stainless steel is classified according to chemical constituent or metal structure.The case where being classified according to metal structure
Under, stainless steel is divided into Austenitic (300 system), ferrite type (400 system), martensite type and biphasic or bipolar type.
In this stainless steel, the hot properties such as coefficient of thermal expansion, heat fatigue of ferritic stainless steel (400 system) are excellent, resistance to
Stress corrosion cracking is strong, and elevated temperature strength is also excellent.Since with this characteristic, ferritic stainless steel is suitable for automobile exhaust system
System, domestic appliance, construction material, household appliances and elevator etc..
However, using ferrite in terms of purposes to need high corrosion-resistant in utensil for kitchen use, gas stove, dishwasher etc.
Stainless steel plate then needs to meet corrosion resistance and processability simultaneously, but existing high corrosion-resistant ferritic stainless steel there are elongation percentage compared with
The low problem for making processability severe.In addition, the Cr content due to high corrosion-resistant ferritic stainless steel is high, it is viscous to generate hot rolling
The phenomenon that tying (sticking) defect is increased, so that appropriate adjusting Cr content is needed, it is corrosion proof simultaneously added with helping improve
Element is to ensure the corrosion resistance of required level.
All the time, many researchers propose a variety of manufacturing methods for improving the processability of ferritic stainless steel.Example
Such as, there is the method for improving processability by the state-variable adjusted in manufacturing process.For example, in the " ferrite of excellent in workability
Stainless steel and its manufacturing method (KR published patent 10-2012-0073644；Patent document 1) " in, it specifically discloses by cold
It rolls and the method for Heat Treatment Control R value.
But the technology in patent document 1 is to improve processability by improving manufacturing process, the applicant has obtained one
Kind in the case where not improving manufacturing process, forms the contents of the alloy compositions of molten steel by adjusting and improve processability and anti-corrosion
The method of property.
In particular, many researchers to the generation for inhibiting bonding (sticking) defect and are shown with a variety of methods always
Also excellent ferritic stainless steel is studied for high corrosion-resistant and processability, however these methods exist and are difficult to apply to scene
Or the problem of consuming a large amount of expenses.
Existing technical literature
Patent document
Patent document 1: KR published patent 10-2012-0073644 (2012.07.05)
Summary of the invention
Subject to be solved by the invention
The present invention provides one kind in the case where not improving manufacturing process, is had an impact by adjusting to the reduction of elongation percentage
Alloy compositions and to the corrosion proof content of alloy compositions for improving and having an impact, so that final cold-rolled products be made not produce
Raw bonding defect, and the ferritic stainless steel and its manufacturer for having the mouldability of excellent elongation percentage and Pitting Potential value excellent
Method.
The method to solve the problem
The excellent ferritic stainless steel of mouldability according to one embodiment of the present invention is characterized in that, it includes:
C, 0.005wt% of 0.001wt%~0.005wt%~0.015wt% N, 0.05wt%~0.20wt% Si,
Mn, 0.01wt% of 0.01wt%~0.10wt%~0.03wt% P, 15wt%~18.5wt% Cr, 0.01wt%~
Al, 0.10wt% of 0.10wt%~0.30wt% Ti, 0.01wt%~0.10wt% Nb, remaining Fe and other can not
The impurity avoided, and meet following [formulas 1],
0.1 < 400C+85.7N+55.6P+7.7Si+7.3Nb < 4.4 [formula 1]
In [formula 1], C, N, P, Si and Nb refer to the content of each component in terms of wt%.
Herein, the excellent ferritic stainless steel of mouldability is characterized in that the elongation percentage of the stainless steel is 35% or more.
In addition, the excellent ferritic stainless steel of mouldability is characterized in that, the stainless steel also include 0.5wt%~
The Mo of 1.0wt%, and meet following [formulas 2],
185 < 10Cr+28.3Mo < 210 [formula 2]
In [formula 2], Cr and Mo refer to the content of each component in terms of wt%.
Herein, the excellent ferritic stainless steel of mouldability is characterized in that, the Pitting Potential of the stainless steel 270mV with
On.
In addition, the feature of the manufacturing method of the excellent ferritic stainless steel of mouldability according to one embodiment of the present invention exists
In manufacture includes C, 0.005wt%~0.015wt% N, 0.05wt%~0.20wt% of 0.001wt%~0.005wt%
Si, 0.01wt%~0.10wt% Mn, 0.01wt%~0.03wt% P, 15wt%~18.5wt% Cr,
Al, 0.10wt% of 0.01wt%~0.10wt%~0.30wt% Ti, 0.01wt%~0.10wt% Nb, remaining Fe
And the slab of other inevitable impurity, and hot rolling, hot-roll annealing, cold rolling and cold rolled annealed are implemented to the slab, and
The component in molten steel for manufacturing the slab meets following [formulas 1],
0.1 < 400C+85.7N+55.6P+7.7Si+7.3Nb < 4.4 [formula 1]
In [formula 1], C, N, P, Si and Nb refer to the content of each component in terms of wt%.
Herein, the manufacturing method of the excellent ferritic stainless steel of mouldability is characterized in that, it is described it is cold rolled annealed after not
The elongation percentage of rust steel is 35% or more.
In addition, the manufacturing method of the excellent ferritic stainless steel of mouldability is characterized in that, for manufacturing the slab
Component in molten steel also includes the Mo of 0.5wt%~1.0wt%, and meets following [formulas 2],
185 < 10Cr+28.3Mo < 210 [formula 2]
In [formula 2], Cr and Mo refer to the content of each component in terms of wt%.
Herein, it is described it is cold rolled annealed after stainless steel Pitting Potential in 270mV or more.
The effect of invention
According to embodiments of the present invention, it has the effect that by being most suitably adjusted in the molten steel for manufacturing stainless steel
Component in, the content of alloy compositions that the reduction of elongation percentage is had an impact, so that elongation percentage is maintained 35% or more, thus
Improve processability.
In addition, also have the effect that by be most suitably adjusted constitute molten steel component in, to corrosion proof raising
The content for the alloy compositions having an impact makes Pitting Potential value maintain 270mV or more, to improve corrosion resistance.
Detailed description of the invention
Fig. 1 is the relationship shown between the relational expression and elongation percentage of the alloy compositions having an impact to the reduction of elongation percentage
Chart.
Fig. 2 is the pass between the relational expression and Pitting Potential value shown to the corrosion proof alloy compositions for improving and having an impact
The chart of system.
Specific embodiment
Hereinafter, the embodiment of the present invention is described in more detail referring to attached drawing.However the present invention can be with a variety of
Form is implemented and is not limited to embodiments described hereinafter.The present embodiment is to completely disclose the present invention, and general's sheet
The range of invention completely passes to the technical staff with Conventional wisdom and provides.
The present invention provide a kind of C, 0.005wt% comprising 0.001wt%~0.005wt%~0.015wt% N,
Si, 0.01wt% of 0.05wt%~0.20wt%~0.10wt% Mn, 0.01wt%~0.03wt% P, 15wt%~
Cr, 0.01wt% of 18.5wt%~0.10wt% Al, 0.10wt%~0.30wt% Ti, 0.01wt%~0.10wt%
Nb, remaining Fe and other inevitable impurity ferritic stainless steel.In addition, also may include 0.5wt%~1.0wt%
Mo.
The content of carbon (C) is preferably 0.001wt% or more and 0.005wt% or less.If the content of carbon (C) is more, intensity
It can improve, but processability can be made to reduce.It need to include the carbon (C) of 0.001wt% or more to obtain sufficient intensity, if but super
0.005wt% is crossed, then processability significantly reduces.
The content of nitrogen (N) is preferably 0.005wt% or more and 0.015wt% or less.Nitrogen (N) has in the same manner with carbon (C)
Improve the effect of the strength of materials.If the content of nitrogen (N) is less than 0.005wt%, TiN crystallization is reduced, to make the isometric of slab
Brilliant rate reduces；If the impurity of material increases and elongation percentage is caused to decline more than 0.015wt%.
The content of silicon (Si) is preferably 0.05wt% or more and 0.20wt% or less.Silicon (Si) contributes to the member of deoxidation
Element, the effect can be obtained by the silicon containing 0.03% or more.If the impurity deposited in the material increases but more than 0.20wt%
The problem of more elongation percentage being caused to reduce.
The content of manganese (Mn) is preferably 0.01wt% or more and 0.10wt% or less.Manganese (Mn) has the intensity for improving steel
Effect.The effect can be obtained by the manganese containing 0.01wt% or more, if but addition content it is excessive, can be precipitated and cause corruption
The MnS of erosion, to reduce corrosion resistance.It therefore include 0.10wt% or less.
The content of phosphorus (P) is preferably 0.01wt% or more and 0.03wt% or less.Phosphorus (P) is inevitably to be included in steel
In element, if its content be less than 0.001wt%, will lead to refining cost rising；It can make to weld if adding excessive content
Property reduce, therefore grain boundary corrosion is easily caused, to include 0.03wt% or less.
The content of chromium (Cr) is preferably 15wt% or more and 18.5wt% or less.Chromium (Cr) is to ensure the anti-corrosion of stainless steel
Property and the most important element added.In the present invention, in order to realize that high corrosion-resistant is added to the chromium (Cr) of 15wt% or more.But
It is that, if the content of chromium (Cr) is more than 18.5wt%, will lead to the generation of hot rolling bonding (sticking) defect.Therefore, include
18.5wt% or less.
The content of aluminium (Al) is preferably 0.01wt% or more and 0.10wt% or less.If the content of aluminium (Al) is less than
0.01wt% then will lead to refining cost rising；If making the impurity of material increase and cause under elongation percentage more than 0.10wt%
Drop.
The content of titanium (Ti) is preferably 0.10wt% or more and 0.30wt% or less.If the content of titanium (Ti) is less than
0.10wt%, then TiN crystallization amount is reduced, and the equiaxial crystal ratio of slab reduces, and the C of solid solution, N element increase and cause under elongation percentage
Drop；If Ti system oxide increases more than 0.30wt%, processability is caused to decline.
The content of niobium (Nb) is preferably 0.01wt% or more and 0.10wt% or less.Niobium (Nb) preferentially with carbon (C), nitrogen (N)
In conjunction with and form the precipitate for inhibiting corrosion resistance to reduce, but when adding excessive content, will lead to and caused by field trash
Bad order and toughness reduce, and cost increase.Therefore, by its content inhibit in 0.01wt% or more and 0.10wt% with
Under.
The content of molybdenum (Mo) is preferably 0.5wt% or more and 1.0wt% or less.Molybdenum (Mo) is for promoting passivating film again
Thus passivation improves the corrosion proof element of stainless steel, keeps effect double by adding together with chromium (Cr).Based on molybdenum (Mo)
Corrosion proof improvement effect it is more significant when comprising 0.5wt% or more molybdenum, if but the content of molybdenum (Mo) is more than 1.0wt%,
It then will lead to price rising.
The present invention stainless steel excellent for being manufactured property, by the molten steel with said components in conventional manner continuous casting and
Slab is produced, it is reheated later, and implements hot rolling, hot-roll annealing, cold rolling and cold rolled annealed.
In particular, when adjusting each component content in molten steel, in order to make the elongation percentage of final products maintain 35% or more,
Preferably further limit the content for element such as phosphorus C, N, P, Si and the Nb having an impact to the reduction of elongation percentage.For example, it is preferable to full
Foot states [formula 1],
0.1 < 400C+85.7N+55.6P+7.7Si+7.3Nb < 4.4 [formula 1]
In [formula 1], for purposes of illustration only, 400C+85.7N+55.6P+7.7Si+7.3Nb is defined as " A ", and C, N,
P, Si and Nb refers to the content of each component in terms of wt%.
In addition, Pitting Potential value is maintained in order to ensure corrosion resistance when adjusting each component content in molten steel
270mV or more, and generation and expense rising in order to solve the problems, such as hot rolling bonding (sticking) defect, preferably further
Limit the content to corrosion proof the element such as Cr and Mo for improving and having an impact.For example, it is preferable to meet following [formulas 2].
185 < 10Cr+28.3Mo < 210 [formula 2]
In [formula 2], for purposes of illustration only, 10Cr+28.3Mo is defined as " B ", and Cr and Mo refer in terms of wt%
The content of each component.
[embodiment]
Hereinafter, by the way that examples illustrate the present invention.
The working condition that ferritic stainless steel is used according to business, implements the test of production final cold rolling plate, and utilizes
Change each component content as shown in table 1 and the molten steel that produces, carry out continuously casting and be prepared for slab, and to having been carried out hot rolling
Hot rolled plate has carried out hot-roll annealing, cold rolling and cold rolled annealed processing.
Specifically, each slab that the molten steel as shown in Table 1 for adjusting constituent content and continuously casting will be used, 1200
~1300 DEG C of temperature range choosing reheats and carries out hot rolling, then with 900~1000 DEG C of temperature model in continuous annealing furnace
It encloses maintenance 30 seconds and is annealed.Then, tension test is carried out to process cold rolling and cold rolled annealed product and measured
Thus Pitting Potential has rated elongation percentage and corrosion resistance, and the results are shown in table 2.In addition, observation bonding (sticking)
Whether generation, and its result is shown in table 2 together.
As shown in [table 1], in each component content of steel of the No.1 into No.15 in addition to No.8, No.10 and No.11
Do not meet the preferred scope of respective components disclosed by the invention.But, the steel (1 group of example) of No.5 to No.7 be unsatisfactory for by with
The condition of the B value represented by [formula 2] for the relationship for limiting Cr and Mo, the steel (comparative example of No.1 to No.4, No.8 to No.11
Group) it is unsatisfactory for the condition of A value represented by [formula 1] by the relationship for limiting C, N, P, Si and Nb, No.12 is to No.15's
Steel (2 groups of example) be all satisfied by [formula 1] represented by A value condition and by [formula 2] indicate B value condition both sides.
In addition, in table 2, whether the generation of bonding (sticking) for, "○", which refers to, produces bonding, "×"
Refer to and does not generate bonding.
[table 1]
[table 2]
As shown in Table 1 and Table 2, in the preferred scope and meet by [formula 1] institute table when by the content control of each component
When the condition for the A value shown (1 group and 2 groups of example), confirms and do not generate bonding, and elongation percentage is 35% or more；On the contrary, working as
It is unsatisfactory for confirming elongation percentage less than 35% when the condition of A value represented by [formula 1] (comparative example group).
In addition, Fig. 1 is shown between the relational expression and elongation percentage of the alloy compositions having an impact to the reduction of elongation percentage
The chart of relationship, confirms: when satisfaction [formula 1], elongation percentage is 35% or more；When being unsatisfactory for [formula 1], elongation percentage is less than
35%.
Therefore, processability is improved in order to make elongation percentage maintain required level or more, preferably control C, N, P, Si and Nb
Content so that by the A value represented by [formula 1] in the range of being greater than 0.1 and less than 4.4.
In addition, as shown in Table 1 and Table 2, confirming: in the preferred scope and full controlling the content of each component
It in the case where foot [formula 1], is unsatisfactory for when [formula 2] (1 group of example), Pitting Potential value is less than 270mV.On the contrary, when meeting [formula 2]
(1 group of a part and example in comparative example group), the Pitting Potential value of final cold rolling annealing product is in 270mV or more.
In addition, Fig. 2 be show to it is corrosion proof improve the relational expression of alloy compositions having an impact and Pitting Potential value it
Between relationship chart, confirm: when satisfaction [formula 2], Pitting Potential value is in 270mV or more；When being unsatisfactory for [formula 2],
Pitting Potential value is less than 270mV.
Therefore, corrosion resistance is improved in order to make Pitting Potential value maintain required level or more, preferably control Cr's and Mo
Content, so that by the B value represented by [formula 2] in the range of being greater than 185 and less than 210.
Above, by attached drawing and the preferred embodiment, the present invention is described, but the present invention is not limited thereto,
But limited by appended claims.Therefore, those of ordinary skill in the art can be in the right for not departing from accompanying
In the range of the technical concept of claim, various deformation and modification are carried out to the present invention.
Claims (2)
1. a kind of ferritic stainless steel that mouldability is excellent, which is characterized in that
The stainless steel includes: C, 0.005wt% of 0.001wt%~0.005wt%~0.015wt% N, 0.05wt%~
Si, 0.01wt% of 0.20wt%~0.10wt% Mn, 0.01wt%~0.03wt% P, 15wt%~18.5wt%
Cr, 0.01wt%~0.10wt% Al, 0.10wt%~0.30wt% Ti, 0.01wt%~0.10wt% Nb,
The Mo of 0.5wt%~1.0wt%, surplus be Fe and other inevitable impurity, and meet following formula 1 and formula 2,
3.11≤400C+85.7N+55.6P+7.7Si+7.3Nb≤4.37 [formula 1]
185 < 10Cr+28.3Mo < 210 [formula 2]
In formula 1 and formula 2, C, N, P, Si, Nb, Cr and Mo refer to the content of each component in terms of wt%,
The elongation percentage of the stainless steel is 35% or more, and the Pitting Potential of the stainless steel is in 270mV or more.
2. a kind of manufacturing method for the ferritic stainless steel that mouldability is excellent, which is characterized in that
Manufacture C, 0.005wt%~0.015wt% N, 0.05wt% comprising 0.001wt%~0.005wt%~
Si, 0.01wt% of 0.20wt%~0.10wt% Mn, 0.01wt%~0.03wt% P, 15wt%~18.5wt%
Cr, 0.01wt%~0.10wt% Al, 0.10wt%~0.30wt% Ti, 0.01wt%~0.10wt% Nb,
The Mo of 0.5wt%~1.0wt%, surplus are Fe and the slab of other inevitable impurity, and to the slab implement hot rolling,
Hot-roll annealing, cold rolling and cold rolled annealed,
The component in molten steel for manufacturing the slab meets following formula 1 and formula 2,
3.11≤400C+85.7N+55.6P+7.7Si+7.3Nb≤4.37 [formula 1]
185 < 10Cr+28.3Mo < 210 [formula 2]
In formula 1 and formula 2, C, N, P, Si, Nb, Cr and Mo refer to the content of each component in terms of wt%,
Wherein carry out it is described it is cold rolled annealed after, the elongation percentage of the stainless steel 35% or more, and Pitting Potential 270mV with
On.
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| KR1020140102109A KR101614606B1 (en) | 2014-08-08 | 2014-08-08 | Ferritic stainless steel with excellent formability and manufacturing method thereof |
| KR10-2014-0102109 | 2014-08-08 |
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| KR101668535B1 (en) * | 2014-12-26 | 2016-10-24 | 주식회사 포스코 | Ferritic stainless steel |
| KR102302386B1 (en) * | 2019-05-13 | 2021-09-15 | 주식회사 포스코 | Ferritic stainless steel with improved corrosion resistance |
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| CN1788102A (en) * | 2004-04-07 | 2006-06-14 | 新日铁住金不锈钢株式会社 | Ferritic stainless steel sheet with excellent formability, and its manufacturing method |
| CN101255532A (en) * | 2007-02-26 | 2008-09-03 | 新日铁住金不锈钢株式会社 | Ferrite series stainless steel plate having excellent formability with small roughness of machining surface and method for manufacturing same |
| CN101538683A (en) * | 2008-03-19 | 2009-09-23 | 宝山钢铁股份有限公司 | Ferritic stainless steel with excellent formability and manufacturing method thereof |
| CN101812641A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Ferrite stainless steel and manufacturing method thereof |
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| JP2007270168A (en) * | 2006-03-30 | 2007-10-18 | Jfe Steel Kk | Method for producing chromium-containing ferritic steel sheet |
| KR101182092B1 (en) | 2010-12-27 | 2012-09-19 | 주식회사 포스코 | Ferritic stainless steel with good workability and method of manufacturing the same |
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- 2014-08-08 KR KR1020140102109A patent/KR101614606B1/en active IP Right Grant
- 2014-12-30 CN CN201410840622.5A patent/CN105803347B/en active Active
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| CN1788102A (en) * | 2004-04-07 | 2006-06-14 | 新日铁住金不锈钢株式会社 | Ferritic stainless steel sheet with excellent formability, and its manufacturing method |
| CN101255532A (en) * | 2007-02-26 | 2008-09-03 | 新日铁住金不锈钢株式会社 | Ferrite series stainless steel plate having excellent formability with small roughness of machining surface and method for manufacturing same |
| CN101538683A (en) * | 2008-03-19 | 2009-09-23 | 宝山钢铁股份有限公司 | Ferritic stainless steel with excellent formability and manufacturing method thereof |
| CN101812641A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Ferrite stainless steel and manufacturing method thereof |
| CN101845595A (en) * | 2009-03-26 | 2010-09-29 | 宝山钢铁股份有限公司 | Ferritic stainless steel with good wrinkle resistance and production method thereof |
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| KR101614606B1 (en) | 2016-04-22 |
| CN105803347A (en) | 2016-07-27 |
| KR20160018953A (en) | 2016-02-18 |
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