CN109563600A - Economizing type two phase stainless steel with excellent bendability - Google Patents
Economizing type two phase stainless steel with excellent bendability Download PDFInfo
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- CN109563600A CN109563600A CN201780047077.6A CN201780047077A CN109563600A CN 109563600 A CN109563600 A CN 109563600A CN 201780047077 A CN201780047077 A CN 201780047077A CN 109563600 A CN109563600 A CN 109563600A
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 66
- 239000010935 stainless steel Substances 0.000 title claims abstract description 56
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 31
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 23
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000011651 chromium Substances 0.000 claims description 46
- 239000011572 manganese Substances 0.000 claims description 45
- 239000010949 copper Substances 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 29
- 239000010959 steel Substances 0.000 description 29
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 23
- 229910001566 austenite Inorganic materials 0.000 description 15
- 230000007797 corrosion Effects 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 15
- 238000005452 bending Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000000137 annealing Methods 0.000 description 10
- 238000003754 machining Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 229910052759 nickel Inorganic materials 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 239000010960 cold rolled steel Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 101150031278 MP gene Proteins 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 150000003818 basic metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Disclose the economizing type two phase stainless steel with excellent bendability.An embodiment according to the present invention, the economizing type two phase stainless steel in terms of weight % comprising 0.01% to 0.06% C, 0.2% to 1.0% Si, 3.5% to 6.5% Mn, 18.5% to 22.5% Cr, 0.05% to 0.25% N, and the iron (Fe) and other inevitable impurity of surplus, it is 3.4 to 4.1 that wherein Cr+Mn, which is 26.0% to 28.5%, Cr/Mn,.
Description
Technical field
This disclosure relates to economizing type two phase stainless steel (lean duplex stainless steel), and more
Body, it is related to the economizing type two phase stainless steel for the bendability for having excellent.
Background technique
In general, the austenitic stainless steel with excellent processability and corrosion resistance includes the iron (Fe) as basic metal
And chromium (Cr) and nickel (Ni) as primary raw material, and passed through and added such as its of molybdenum (Mo) and copper (Cu) thereto
His element and be developed to the various steel types suitable for various applications.
Due to 300 series stainless steels with excellent corrosion resistance and processability include high price raw material such as Ni and
Mo, therefore discussed 400 series stainless steels alternatively object.However, there are the formabilities of 400 series stainless steels not
The problem of formability of 300 series stainless steels can be reached.Although the corrosion resistance level of 400 series stainless steels is according to using ring
Border is suitable for the slab less processed compared with the hot/cold rolled stainless steel for having been subjected to more process segments, but due to difference
Impact characteristics and weld seam deterioration, there are many limitations when using as slab for 400 series stainless steels.
Meanwhile wherein being mixed with the two phase stainless steel of austenite phase and ferritic phase has stainless steel and ferritic stainless steel
The advantages of the two, and developed a plurality of types of two phase stainless steels.
Due to the alloying elements such as Ni, Mo valuableness, cheap stainless steel is constantly received more and more attention.As a result,
Have attempted to develop the economizing type alloy with a small amount of expensive alloy element.This trend also in microscopic structure by ferritic phase and
It is confirmed in the two phase stainless steel that austenite phase is formed.
Patent document 1 discloses such austenite ferrite stainless steel: it is with low Ni content and high N content, with logical
The stability of austenite phase is overregulated to constitute with high-elongation and simultaneously the economizing type two phase stainless steel with high intensity.Section
About type two phase stainless steel due to the crystallite dimension as caused by duplex structure refine effect and with excellent corrosion resistance and high
Intensity, therefore it uses and gradually increases.
Stainless steel decorative tube or structural tube can be obtained according to its application with various shape, and it also requires various characteristics
(such as corrosion resistance and formability).Therefore, according to shape and material requirements, 400 series, 200 series and 300 series are stainless
Steel has been used for this, and relatively cheap 400 series and 200 series stainless steels have been primarily used to this.
Although economizing type two phase stainless steel is not only due to excellent corrosion resistance and is expected applied to exterior decoration pipe, and
And be expected due to high intensity applied to structural tube, but there is limitation in the use of economizing type two phase stainless steel, because of its valence
Lattice are with 400 series and 200 series stainless steels compared to relatively high and be easy to appear and split when economizing type two phase stainless steel is bent
Line.Therefore, for 400 series of replacement and 200 series stainless steel pipes, it is desirable to reduce the amount of expensive alloy element, and need to change
It is apt to bendability to manufacture the pipe with complex section (such as rectangular section).
Patent document 1: Korea Patent Laid discloses No. 10-2009-0005252 (on January 12nd, 2009 is open)
Summary of the invention
Technical problem
This disclosure relates to provide such economizing type two phase stainless steel: it passes through the element for making to constitute two phase stainless steel
In high price alloying element such as Ni, Cu and Mo amount minimize and optimize Cr and Mn total amount and Cr and Mn it
Than, the duplex structure that coexists with wherein austenite phase and ferritic phase and there is improved bendability.
Technical solution
The one aspect of present disclosure provides economizing type two phase stainless steel, with excellent bendability and
With all form weight percent (%) meter include: 0.01% to 0.06% carbon (C), 0.2% to 1.0% silicon (Si),
3.5% to 6.5% manganese (Mn), 18.5% to 22.5% chromium (Cr), 0.05% to 0.25% nitrogen (N) and surplus
Iron (Fe) and other inevitable impurity, wherein the total amount of Cr and Mn is 26.0% to 28.5%, and Cr/Mn ratio is 3.4
To 4.1.
The economizing type two phase stainless steel may include 0.5% or less (Ni), 0.5% or less copper (Cu) and
0.5% or less molybdenum (Mo).
The volume fraction of ferrite base body tissue in microscopic structure can be 50% to 75%.
The elongation percentage of the stainless steel can be 30% to 40%.
Beneficial effect
According to the embodiment of present disclosure, in the element for constituting two phase stainless steel, the alloy of such as Ni, Cu and Mo
Element is controlled as impurity, and these alloying elements are minimized or from wherein excluding, thus can economize on resources and
The manufacturing cost of two phase stainless steel can be reduced.
In addition, the bendability of stainless steel can be improved by the total amount and the ratio between Cr and Mn of optimization Cr and Mn.
Detailed description of the invention
Fig. 1 is that the warp according to the economizing type two phase stainless steel of the embodiment of present disclosure after 180 ° of bending machinings adds
The photo on work surface.
Fig. 2 is that the warp according to the economizing type two phase stainless steel of the comparative example of present disclosure after 180 ° of bending machinings adds
The photo on work surface.
Specific embodiment
According to the economizing type two phase stainless steel with excellent bendability of present disclosure embodiment
With all form weight percent (%) meter include: 0.01% to 0.06% carbon (C), 0.2% to 1.0% silicon (Si),
3.5% to 6.5% manganese (Mn), 18.5% to 22.5% chromium (Cr), 0.05% to 0.25% nitrogen (N) and surplus
Iron (Fe) and other inevitable impurity, wherein the total amount of Cr and Mn is 26.0% to 28.5%, and Cr/Mn ratio is 3.4
To 4.1.
Invention embodiment
Hereinafter, it will be described in detail with reference to the accompanying drawings the exemplary implementation scheme of present disclosure.Following embodiment party is provided
Case is sufficiently to convey the design of present disclosure to those skilled in the art.Present disclosure is not limited to these embodiments, and
And it can implement otherwise.In the accompanying drawings, it is convenient to omit the part unrelated with description is to be explicitly described the disclosure
Content, and can be with the size of amplifier module should be readily appreciated that.
According to the economizing type two phase stainless steel with excellent bendability of present disclosure embodiment
With all form weight percent (%) meter include: 0.01% to 0.06% carbon (C), 0.2% to 1.0% silicon (Si),
3.5% to 6.5% manganese (Mn), 18.5% to 22.5% chromium (Cr), 0.05% to 0.25% nitrogen (N) and surplus
Iron (Fe) and other inevitable impurity.
The amount of C is 0.01% to 0.06%.
C as the element for forming austenite phase may be used as the substitute of the element such as Ni of high price, and be to be used for
Increase the effective element of the intensity of steel by improving solid solubility.
Excessive C may cause the formation of carbon segregation and thick carbide in the central area of steel, to hot rolling, move back
Fire, cold rolling and the subsequent operation of cooling and annealing process have an adverse effect, and C may be easy ferritic phase and austenite phase it
Between boundary in conjunction with the element such as Cr for effectively forming carbide to corrosion resistance, reduce the Cr amount around crystal grain, from
And reduce corrosion resistance.Therefore, in order to maximize corrosion resistance, the amount of C can be 0.06% or less.Therefore, the amount of C can
Think 0.01% to 0.06%.
The amount of Si is 0.2% to 1.0%.
The Si added on a small quantity for deoxidation effect is the ferritic member of formation being enriched in ferrite by annealing
Element.
Si content needs to obtain the ferritic phase of appropriate score with 0.2% or bigger amount addition.However, being more than
1.0% excessive Si may make the hardness of ferritic phase increase sharply, and elongation percentage is caused to reduce, and make clinker during steelmaking process
Mobility reduces, and field trash is formed in conjunction with oxygen, to damage corrosion resistance.Therefore, the amount of Si can be 0.2% to 1.0%
In the range of.
Mn is added with 3.5% to 6.5% amount.
Element of the Mn as the mobility for adjusting molten metal, as deoxidier and increases the solid solubility of nitrogen, adds Mn
To replace the Ni of high price as the element for forming austenite.
When the amount of Mn is less than 3.5%, in the case where controlling Ni and Cu for impurity, even if adjusting other forms Ovshinsky
When the amount of the element of body such as N, it is also difficult to obtain the austenite phase of appropriate score.When the amount of Mn is greater than 6.5%, it is difficult to obtain resistance to
Corrosivity and the uncontrollable phase fraction due to excessive austenite phase.Therefore, the amount of Mn can be limited in 3.5% to
In the range of 6.5%.
The amount of Cr is 18.5% to 22.5%.
Cr plays a major role as the element for making ferritic phase stable together with Si when obtaining ferritic phase, and must
It need to add to obtain corrosion resistance.
Although improving corrosion resistance by the amount for increasing Cr, in order to keep phase fraction to need to increase the Ni of high price
The amount for the element for forming austenite with other.Therefore, the amount of Cr can be limited in the range of 18.5% to 22.5%.
The amount of N is 0.05% to 0.25%.
N is enriched in austenite phase as the element for helping to keep austenite phase stable together with C and Ni by annealing.
As the amount of N increases, both corrosion resistance and intensity can also be improved.However, excessive N consolidates due to the excessive of N
Solubility and nitrogen pore may generated during casting, lead to surface defect, therefore, it is difficult to steadily manufacture steel.Therefore, the amount of N can
To be limited in the range of 0.05% to 0.25%.
For example, economizing type two phase stainless steel according to an embodiment may include 0.5% or less Ni, 0.5%
Or less Cu and 0.5% or less Mo.
Ni rises in terms of the stability for improving austenite phase as the element of the stable austenite together with Mn, Cu and N
Main function.
However, can be also to form Austria by increasing when the amount for the Ni for making high price is minimized to reduce manufacturing cost
The amount of the Mn and N of the element of family name's body maintain the balance of phase fraction.The Ni of high price can not be added with prevent manufacturing cost by
This increases.Accordingly, it is considered to which to the amount as impurity, the amount of Ni can be restricted to 0.5% or smaller (including zero (0)).
Cu is to inhibit the processing hardening as caused by the formation of the martensitic phase of strain inducing and facilitate austenitic stainless steel
The element of softening.
However, it is possible to which the manufacturing cost of product increases caused by not adding Cu to prevent the Cu because of high price.Therefore, it examines
Consider the amount as impurity, the amount of Cu can be restricted to 0.5% or smaller (including zero (0)).
Mo is the very effective element that can improve corrosion resistance while stablizing ferrite together with Cr.
However, it is possible to which manufacturing cost increases caused by not adding Mo to prevent the Mo because of high price.Accordingly, it is considered to making
For the amount of impurity, the amount of Mo can be restricted to 0.5% or smaller (including zero (0)).
That is, due in the element of two phase stainless steel for constituting an embodiment according to present disclosure,
The alloying element of such as Ni, Cu and Mo are controlled as impurity and are minimized or are left out, therefore can save money
Source and the manufacturing cost of two phase stainless steel can be made to minimize.Therefore, when the respective amount of Ni, Cu and Mo is more than 0.5%, by
Increase in the amount of the W metal of high price, Cu and Mo, manufacturing cost can increase.
In addition, in the two phase stainless steel according to an embodiment of present disclosure, the total amount of Cr and Mn are
26.0% to 28.5%, and Cr/Mn ratio is 3.4 to 4.1.
This disclosure relates to replace the economizing type two-phase of the low price of 400 series and 200 series stainless steel decorative tubes not
The composition of rust steel.To alloying element Ni, Cu and Mo comprising high price as impurity rather than the low price of object element
When the formability of economizing type two phase stainless steel is studied, the inventors discovered that uncommon phenomenon, passes through wherein having
The stainless steel of the relatively low elongation of tensile strength test measurement has preferably curved compared with the stainless steel compared with high-elongation
Bent processability.
Based on the uncommon phenomenon, discovery only the total amount of Cr and Mn by weight 26.0% to 28.5% model
Excellent bendability is just obtained in enclosing and when Cr/Mn is than in the range of 3.4 to 4.1.
That is, in the range of the total amount of Cr and Mn are adjusted to by weight 26.0% to 28.5% and by Cr/
Mn ratio be adjusted to 3.4 to 4.1 in the range of when, during can be provided in bending machining with excellent formability low price
Stainless steel.
For example, ferrite base body tissue in the microscopic structure of economizing type two phase stainless steel according to an embodiment
Volume fraction can be 50% to 75%.When the volume fraction of ferrite base body tissue is less than 50%, possibly foot can not be obtained
Enough corrosion resistances.When the volume fraction of ferrite base body tissue is greater than 75%, the volume fraction phase of austenitic matrix tissue
To reduction, it is thus possible to enough processabilities can not be obtained.
For example, the elongation percentage of economizing type two phase stainless steel according to an embodiment can be 30% to 40%.
When elongation percentage is less than 30%, processability be may deteriorate.It, can during bending machining when elongation percentage is greater than 40%
It can be cracked.It can be improved as elongation percentage increases due to being generally expected to processability, it is therefore contemplated that bendability
It can be improved.However, when the amount, the total amount of Cr and Mn and Cr/Mn ratio of element meet the standard according to present disclosure
When, it has problems in that, it is cracked in steel bending when elongation percentage is more than 40%.
Economizing type two phase stainless steel according to an embodiment such as gets off manufacture: carrying out heat to two-phase stainless plate slab
It rolls, the slab is with the C that weight percent (%) meter all formed includes 0.01% to 0.06%, 0.2% to 1.0%
Si, 3.5% to 6.5% Mn, 18.5% to 22.5% Cr, 0.05% to 0.25% N, 0.5 or less Ni, 0.5 or
Less Cu, 0.5 or less Mo and the Fe of surplus and other inevitable impurity, wherein the total amount of Cr and Mn be
26.0% to 28.5%, Cr/Mn ratio are 3.4 to 4.1；1050 DEG C to 1150 DEG C at a temperature of to hot rolled steel plate carry out heat move back
Fire；Cold rolling is carried out to the steel plate through thermal annealing；1050 DEG C to 1150 DEG C at a temperature of cold annealing is carried out to cold-rolled steel sheet；And
Pickling is carried out to gains.
Any method well known in the art can be used to carry out the economizing type two-phase stainless plate slab with above-mentioned composition
Rolling is to manufacture slab, and the thickness of hot rolled steel plate can be 4mm to 20mm.For example, can be at 1050 DEG C to 1150 DEG C
At a temperature of by hot rolled steel plate anneal 30 seconds to 60 minutes.
Hereafter, cold rolling, and the thickness of cold-rolled steel sheet can be carried out to hot rolled steel plate according to any method well known in the art
Degree can be 0.1mm to 5mm.For example, can 1050 DEG C to 1150 DEG C at a temperature of by cold-rolled steel sheet anneal 10 seconds to 60 points
Clock.
Hereinafter, one or more exemplary implementation schemes will be described in detail referring to following embodiment and comparative example.
The steel of embodiment and comparative example
The steel for separately including element as shown in Table 1 below is prepared according to following embodiment and comparative example.In vacuum sense
It answers and is cast as every kind of steel in smelting furnace to weigh 50kg and with a thickness of the ingot of 140mm.By the ingot cast 1250 in heating furnace
Aging 3 hours at a temperature of DEG C are hot-rolled down to the width of 200mm and the thickness of 4mm, and it is cooling to carry out air.It will be cooling through air
Hot rolled steel plate 1100 DEG C at a temperature of thermal annealing 1 minute, and be cold-rolled to after pickling the thickness of 1.5mm.By cold-rolled steel
Plate 1100 DEG C at a temperature of it is cold annealing 30 seconds and pickling to prepare two phase stainless steel cold-rolled steel sheet sample.
Table 1
For, with the steel of 4mm thickness, the ferrite of steel being measured by using Ferritescope under thermal annealing state
Score.Ferritescope is the device that the score of ferritic phase is measured using the magnetic characteristic of steel, and is manufactured by Fisher
" Ferritescope MP30 " measurement ferrite fraction be shown in the following table 2.
It is 180mm to the length obtained by the steel plate through cold annealing with a thickness of 1.5mm on the direction perpendicular to rolling
And the sample that width is 20mm is processed and carries out crooked test.The formed punch that crooked test is 1.5mm by using angular radius
(punch) with 10 tons of power first by 90 ° of sample bent and further by sample bent until 180 ° carry out.It is curved based on 180 °
The result of song test determines the rupture of sample, is as a result shown in the following table 2.
The tensile strength test results of steel according to examples and comparative examples are shown in the following table 2.In the side perpendicular to rolling
The sample that measuring length is 50mm and width is 12.5mm is obtained by the steel plate with a thickness of 1.5mm through cold annealing upwards, and
Tensile strength test is carried out under 20mm/ minutes tensile speeds at room temperature.For each sample, 5 tensile strengths are being carried out
The characteristic of steel after test is shown in the following table 2.
Table 2
Referring to Tables 1 and 2, do not have in the steel according to the embodiment of present disclosure it is cracked, but at all
According to all cracked in the steel of comparative example.
Fig. 1 is that the warp according to the economizing type two phase stainless steel of the embodiment of present disclosure after 180 ° of bending machinings adds
The photo on work surface.Fig. 2 is the economizing type two phase stainless steel according to the comparative example of present disclosure after 180 ° of bending machinings
Processed surface photo.
Specifically, Fig. 1 is the photo on the processed surface according to the steel of embodiment 1 after 180 ° of bending machinings, and Fig. 2 is
According to the photo on processed surface of the steel of comparative example 6 after 180 ° of bending machinings.
That is, referring to Fig.1, without cracked after a bending process for establishing, thus it is confirmed that, the steel
With excellent bendability.Referring to Fig. 2, it has been confirmed that there is serious face crack by bending machining.
Referring to upper table 2, it has been confirmed that being unsatisfactory for according to the total amount of the Cr and Mn of present disclosure and Cr/Mn ratio
In the case where parameter, bendability deterioration, even if there is the high elongation percentage by tensile strength test measurement in stainless steel
When be also such.
More specifically, this is higher than other steel although the elongation percentage of the steel of comparative example 2 and 4 is respectively 45.1% and 43.7%
Elongation percentage, but after 180 ° of bending machinings or cracked.Therefore, it has been confirmed that control as described herein and Cr
Parameter (that is, the total amount of Cr and Mn and Cr/Mn ratio) related with Mn is important for obtaining excellent bendability.
Therefore, in order to obtain the excellent bendability of two phase stainless steel, the total amount of the Cr and Mn of the element as steel
Need to be controlled as by weight 26.0% to 28.5%, and the ratio between Cr by weight percentage and Mn (Cr/Mn) need
It is controlled as 3.4 to 4.1.
Although present disclosure has been described in detail referring to exemplary implementation scheme, those skilled in the art should be managed
Solution, can carry out various changes in form and details without departing from the spirit and scope in the present disclosure.
Industrial applicibility
According to the economizing type two phase stainless steel with excellent bendability of present disclosure due to excellent bending
Processability and can be applied to various fields, such as exterior decoration pipe or internal structure pipe.
Claims (4)
1. a kind of economizing type two phase stainless steel has excellent bendability and the weight percent (%) all to form
Meter includes: 0.01% to 0.06% carbon (C), 0.2% to 1.0% silicon (Si), 3.5% to 6.5% manganese (Mn), 18.5%
To the iron (Fe) and other inevitable impurity of 22.5% chromium (Cr), 0.05% to 0.25% nitrogen (N) and surplus,
It is 3.4 to 4.1 that wherein the total amount of Cr and Mn, which is 26.0% to 28.5%, Cr/Mn ratio,.
2. economizing type two phase stainless steel according to claim 1, wherein economizing type two phase stainless steel includes 0.5% or less
(Ni), 0.5% or less copper (Cu) and 0.5% or less molybdenum (Mo).
3. economizing type two phase stainless steel according to claim 1, the wherein body of the ferrite base body tissue in microscopic structure
Fraction is 50% to 75%.
4. economizing type two phase stainless steel according to claim 1, wherein the elongation percentage of the stainless steel is 30% to 40%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2016-0101824 | 2016-08-10 | ||
| KR1020160101824A KR101820526B1 (en) | 2016-08-10 | 2016-08-10 | Lean duplex stainless steel having excellent bending workability |
| PCT/KR2017/008215 WO2018030690A1 (en) | 2016-08-10 | 2017-07-31 | Lean duplex stainless steel having excellent bending processability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109563600A true CN109563600A (en) | 2019-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780047077.6A Pending CN109563600A (en) | 2016-08-10 | 2017-07-31 | Economizing type two phase stainless steel with excellent bendability |
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| Country | Link |
|---|---|
| US (1) | US20190177814A1 (en) |
| EP (1) | EP3498878A4 (en) |
| JP (1) | JP2019522726A (en) |
| KR (1) | KR101820526B1 (en) |
| CN (1) | CN109563600A (en) |
| WO (1) | WO2018030690A1 (en) |
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| CN112893489A (en) * | 2021-01-19 | 2021-06-04 | 西宁特殊钢股份有限公司 | Rolling process for eliminating rolling-state mixed crystal structure of 20MnCr5 steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3736131A (en) * | 1970-12-23 | 1973-05-29 | Armco Steel Corp | Ferritic-austenitic stainless steel |
| KR19990007429A (en) * | 1997-06-30 | 1999-01-25 | 므나르드 쟝-가브리엘 | Osteoferrite stainless steel with very low nickel content and high tensile elongation |
| KR20140105849A (en) * | 2012-03-09 | 2014-09-02 | 닛폰 스틸 앤드 스미킨 스테인레스 스틸 코포레이션 | Ferrite-austenite 2-phase stainless steel plate having low in-plane anisotropy and method for producing same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI122657B (en) * | 2010-04-29 | 2012-05-15 | Outokumpu Oy | Process for producing and utilizing high formability ferrite-austenitic stainless steel |
| KR20130105721A (en) * | 2011-01-27 | 2013-09-25 | 닛폰 스틸 앤드 스미킨 스테인레스 스틸 코포레이션 | Alloying element-saving hot rolled duplex stainless steel material, clad steel sheet having duplex stainless steel as mating material therefor, and production method for same |
| KR101379063B1 (en) * | 2011-11-15 | 2014-03-28 | 주식회사 포스코 | Lean duplex stainless steel and manufacturing method using the same |
| KR101379079B1 (en) * | 2011-11-30 | 2014-03-28 | 주식회사 포스코 | Lean duplex stainless steel |
| FI125734B (en) * | 2013-06-13 | 2016-01-29 | Outokumpu Oy | Duplex ferritic austenitic stainless steel |
| KR20160080304A (en) * | 2014-12-26 | 2016-07-08 | 주식회사 포스코 | Duplex stainless steel excellent in deep drawing quality |
-
2016
- 2016-08-10 KR KR1020160101824A patent/KR101820526B1/en active IP Right Grant
-
2017
- 2017-07-31 WO PCT/KR2017/008215 patent/WO2018030690A1/en unknown
- 2017-07-31 US US16/324,714 patent/US20190177814A1/en not_active Abandoned
- 2017-07-31 EP EP17839708.9A patent/EP3498878A4/en not_active Withdrawn
- 2017-07-31 CN CN201780047077.6A patent/CN109563600A/en active Pending
- 2017-07-31 JP JP2018565292A patent/JP2019522726A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3736131A (en) * | 1970-12-23 | 1973-05-29 | Armco Steel Corp | Ferritic-austenitic stainless steel |
| KR19990007429A (en) * | 1997-06-30 | 1999-01-25 | 므나르드 쟝-가브리엘 | Osteoferrite stainless steel with very low nickel content and high tensile elongation |
| KR20140105849A (en) * | 2012-03-09 | 2014-09-02 | 닛폰 스틸 앤드 스미킨 스테인레스 스틸 코포레이션 | Ferrite-austenite 2-phase stainless steel plate having low in-plane anisotropy and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3498878A4 (en) | 2019-08-07 |
| KR101820526B1 (en) | 2018-01-22 |
| EP3498878A1 (en) | 2019-06-19 |
| WO2018030690A1 (en) | 2018-02-15 |
| JP2019522726A (en) | 2019-08-15 |
| US20190177814A1 (en) | 2019-06-13 |
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