CN106661695A - Ferritic stainless steel sheet - Google Patents

Ferritic stainless steel sheet Download PDF

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Publication number
CN106661695A
CN106661695A CN201580043511.4A CN201580043511A CN106661695A CN 106661695 A CN106661695 A CN 106661695A CN 201580043511 A CN201580043511 A CN 201580043511A CN 106661695 A CN106661695 A CN 106661695A
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stainless steel
corrosion resistance
steel plate
content
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CN106661695B (en
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西田修司
石井知洋
中村彻之
藤泽光幸
上力
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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Priority claimed from JP2014240888A external-priority patent/JP6146400B2/en
Priority claimed from JP2014240889A external-priority patent/JP6146401B2/en
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Priority claimed from PCT/JP2015/001030 external-priority patent/WO2016024370A1/en
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    • 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
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    • C21D6/00—Heat treatment of ferrous alloys
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    • 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
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    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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Abstract

Provided is a ferritic stainless steel which exhibits excellent corrosion resistance and workability equivalent or superior to SUH409L stainless steel. A ferritic stainless steel sheet is characterized by containing, in terms of mass %, 0.025% or less of C, 0.01-1.00% of Si, 0.05-1.00% of Mn, 0.020-0.040% of P, 0.030% or less of S, 0.001-0.100% of Al, 12.5-14.4% of Cr, 0.01-0.80% of Ni, 0.11-0.40% of Ti, 0.010-0.100% of Nb and 0.020% or less of N, with the remainder consisting of Fe and unavoidable impurities.

Description

Ferrite series stainless steel plate
Technical field
The present invention relates to have excellent corrosion resistance and it is equal with SUH409L more than processability ferrite it is stainless Steel plate.
Background technology
Because ferrite-group stainless steel has excellent corrosion resistance and resource-saving, so being used in automobile exhaust system Various uses headed by part, building materials, kitchen appliance and appliances parts etc..The most important conjunction that ferrite-group stainless steel contains Gold element is Cr.In general, when Cr contents are increased, corrosion resistance can be improved, but processability can decline.Due to the spy Levy, (representative steel grade is SUH409L (Japanese Industrial Standards JIS G to the low Cr systems steel grade of excellent in workability but corrosion-resistant 4312：2011,11mass%Cr-0.3mass%Ti)) and poor in processability but excellent corrosion resistance middle Cr systems steel grade it is (representative Steel grade is SUS430 (Japanese Industrial Standards JIS G 4305：2012,16mass%Cr)) Jing is often distinguished according to purposes and used.
In recent years, along with the variation of the design in Domestic electronic product, the portion with complicated shape is occurred in that Part.Wherein, it is interior during length to tie up if ferrite-group stainless steel is applied to specially require the part of corrosion resistance Shield, can cut down life cycle cost.From be processed as complexity shape from the viewpoint of, it is believed that using excellent in workability SUH409L is appropriate.However, because the corrosion resistance of SUH409L is inadequate, so being dfficult to apply to above-mentioned part.Cause This, needs with excellent corrosion resistance, also with stainless with the ferrite of the equal excellent processabilities above of SUH409L Steel.
It is on the books in patent document 1, patent document 2 with regard to corrosion resistance and the respective raising of processability.In patent text Offer in 1, disclose the high-purity ferritic stainless steel of surface characteristic and excellent corrosion resistance.In patent document 1, by control The form of Ti systems processed precipitate, realizes the raising of corrosion resistance.
In patent document 2, the excellent ferrite series stainless steel plate of ductility is disclosed.In patent document 2, by control The form of Mg systems processed field trash, Ti carbon sulfide, realizes the raising of elongation.
Citation
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2001-288544 publications
Patent document 2：Japanese Unexamined Patent Publication 2001-294990 publications
The content of the invention
Problems to be solved by the invention
However, in patent document 1, have studied the pitting potential of the index as corrosion resistance, but always stretch without research The processability such as long rate and r values.In addition, though the finished product elongation that the index as processability is have studied in patent document 2 is (disconnected Split elongation), but do not study corrosion resistance.As shown in these documents, in the research of the past of ferrite-group stainless steel, Eye is few in the research example of corrosion resistance and processability both sides.
The present invention provides one kind in ferrite-group stainless steel, with excellent corrosion resistance and with SUH409L on an equal basis with On excellent processability ferrite-group stainless steel.
Means for solving the problem
The present inventors has carried out the comprehensive study to meet corrosion resistance and both processability for the problems referred to above.
Firstly it is found that by adding Ti and Nb compoundly, improve can corrosion resistance.The effect is in the content of Ti More than 0.11% and less than 0.40%, Nb content be more than 0.010% and less than 0.100% in the case of obtain.Thus, may be used Know：In the ferrite-group stainless steel containing more than 12.5% Cr, excellent corrosion resistance can be obtained.Contain additionally, representing " % " of amount is referred to " quality % ".
Additionally, it was found that the raising containing more than 0.010% and less than 0.100% Nb to processability is effective.Add Plus Nb be solid-solubilized in steel, with by the effect of crystal grain grain refined.Due to the uneven portion of local easily near crystal boundary Generate { 111 }<001>The crystal grain of orientation, so along with by the miniaturization for adding crystal grain caused by above-mentioned Nb, tying again During crystalline substance, the generation frequency of the recrystallization grain in { 111 } face increases.Due to the generation frequency of the recrystallization grain along with { 111 } face Rate increases, it is suppressed that Goss orientations ({ 110 } of increase intra-face anisotropy<001>) crystal grain generation, so reducing The intra-face anisotropy of tissue, Elmin(minimum of a value of El) and rmin(minimum of a value of r) is improved.Understand：Due to the effect, containing In having less than 14.4% ferrite-group stainless steel of Cr, the processability more than equal with SUH409L can be obtained.
By the research of above-mentioned corrosion resistance and processability both sides, distinguish：In order to realize with excellent corrosion-resistant Property and it is equal with SUH409L more than processability ferrite-group stainless steel, in the ferrite containing 12.5～14.4% Cr In being stainless steel, containing Ti：0.11～0.40% and Nb：0.010～0.100% is extremely important.
Based on above-mentioned opinion, its design constitutes as follows the present invention.
[1] a kind of ferrite series stainless steel plate, it is characterised in that in terms of quality %, containing C：Less than 0.025%, Si： 0.01～1.00%, Mn：0.05～1.00%, P：0.020～0.040%, S：Less than 0.030%, Al：0.001～ 0.100%th, Cr：12.5～14.4%, Ni：0.01～0.80%, Ti：0.11～0.40%, Nb：0.010～0.100% and N：Less than 0.020%, remainder is made up of Fe and inevitable impurity.
[2] ferrite series stainless steel plate according to [1], it is characterised in that Ti contents and Nb contents meet following formula (1),
0.10≤Nb/Ti≤0.30(1)
Element mark in formula (1) refers to the content of each element.
[3] ferrite series stainless steel plate according to [1] or [2], it is characterised in that in terms of quality %, also containing choosing From Mo：0.01～0.30%, Cu：0.01～0.50%, Co：0.01～0.50% and W：0.01～0.50% one kind or two More than kind.
[4] ferrite series stainless steel plate according to any one of [1]～[3], it is characterised in that in terms of quality %, Also containing selected from V：0.01～0.25%, Zr：0.01～0.30%, B：0.0003～0.0030%, Mg：0.0005～ 0.0030%th, Ca：0.0003～0.0030%, Y：0.001～0.20% and REM (rare earth metal)：0.001～0.10% One or more.
[5] ferrite series stainless steel plate according to any one of [1]～[4], it is characterised in that in terms of quality %, Also containing selected from Sn：0.001～0.50% and Sb：0.001～0.50% one or two.
[6] ferrite series stainless steel plate according to any one of [1]～[5], it is characterised in that in terms of quality %, Containing V：0.01～0.25%, Ti content and Nb contents meet following formula (1), under Ti contents, Nb contents and V content also meet Formula (2) is stated,
0.10≤Nb/Ti≤0.30 (1)
0.20≤V/(Ti+Nb)≤1.00 (2)
Element mark in formula (1), (2) refers to the content of each element.
The effect of invention
The corrosion resistance and excellent in workability of the ferrite series stainless steel plate of the present invention.Specifically, according to the present invention, energy Access with excellent corrosion resistance and it is equal with SUH409L more than processability ferrite-group stainless steel.
Description of the drawings
Fig. 1 is the figure for representing the impact that Ti contents and Nb contents are brought to corrosion resistance.
Fig. 2 is the figure for representing the impact that Ti contents, Nb contents and V content bring to corrosion resistance.
Specific embodiment
Hereinafter, embodiments of the present invention are illustrated.Additionally, the present invention is not limited to following embodiment.
The present invention ferrite series stainless steel plate in terms of quality %, containing C：Less than 0.025%, Si：0.01～1.00%, Mn：0.05～1.00%, P：0.020～0.040%, S：Less than 0.030%, Al：0.001～0.100%, Cr：12.5～ 14.4%th, Ni：0.01～0.80%, Ti：0.11～0.40%, Nb：0.010～0.100% and N：Less than 0.020%.
In the following description, unless otherwise specified, the % for representing the composition of ferrite series stainless steel plate refers to matter Amount %.
C：Less than 0.025%
C is the effective element of intensity to improving steel.From obtaining from the viewpoint of its effect, being preferably set to C content More than 0.001%.But, when C content is more than 0.025%, corrosion resistance and processability can be remarkably decreased.Therefore, C content sets For less than 0.025%.More preferably it is set to less than 0.015%.More preferably less than 0.010%.
Si：0.01～1.00%
Si is as the useful element of deoxidier.The effect is obtained by the way that Si contents are set to into more than 0.01%.It is another Aspect, when Si contents are more than 1.00%, steel hardening and processability decline.Therefore, Si contents are limited to 0.01～1.00% In the range of.More preferably 0.03～0.50% scope.More preferably 0.06～0.20% scope.
Mn：0.05～1.00%
Mn has deoxidation effect.From obtaining from the viewpoint of the effect, Mn contents being set to into more than 0.05%.On the other hand, When Mn contents are more than 1.00%, can promote MnS precipitation and coarsening and cause corrosion resistance to decline.Therefore, Mn contents limit It is scheduled in the range of 0.05～1.00%.More preferably 0.10～0.40% scope.More preferably 0.20～0.30% Scope.
P：0.020～0.040%
P is the element for declining corrosion resistance.Further, since P is in cyrystal boundary segregation, and hot-workability declines.It is therefore preferable that P Content is as low as possible, is set to less than 0.040%.However, to less than 0.020% P content excessive reduction can cause steel processed into This rising.Therefore, P content is limited in the range of 0.020～0.040%.More preferably 0.020～0.030% scope.
S：Less than 0.030%
S and Mn forms precipitate MnS.The MnS becomes the starting point of spot corrosion with the interface of stainless steel mother metal, and makes ferrite Stainless corrosion resistance declines.It is therefore preferable that S contents are relatively low, less than 0.030% is set to.Preferably less than 0.020%.Enter One step is preferably less than 0.010%.
Al：0.001～0.100%
Al is element effective to deoxidation.The effect is obtained by the way that Al content is set to into more than 0.001%.The opposing party Face, when Al content is more than 0.100%, due to the increase of surface damage caused by the non-metallic inclusion by Al systems, surface matter Amount can decline.Therefore, Al content is limited in the range of 0.001～0.100%.More preferably 0.01～0.08% scope. More preferably 0.02～0.06% scope.
Cr：12.5～14.4%
Cr is the important element of the corrosion resistance and processability for determining ferrite-group stainless steel.By Cr shapes on the steel surface The corrosion resistance of ferrite-group stainless steel is obtained into passivation epithelium.Therefore, increase more Cr contents, corrosion resistance is more improved. In the present invention, by the way that Cr contents are adjusted in a specific range, and Ti contents described later and Nb contents are also adjusted In specific scope, so that the corrosion resistance of steel is improved.In the present invention, in order to obtain excellent corrosion resistance, need to contain There is more than 12.5% Cr.On the other hand, as Cr contents increase, the processability of ferrite-group stainless steel declines.In the present invention In, by adding Nb described later, improve processability, in the present invention, in order to obtain the processing more than equal with SUH409L Property, can be containing less than 14.4% Cr.Therefore, Cr contents are limited in the range of 12.5～14.4%.More preferably 13.0 ～13.8% scope.
Ni：0.01～0.80%
Ni is suppressed by anode reaction caused by oxygen, even and lower pH is also able to maintain that the element of passivation.That is, Ni The effect of resistance to crevice corrosion is improved, significantly the progress of the corrosion under inhibitory activity dissolved state, makes ferrite stainless The corrosion resistance of steel is improved.
The effect is obtained by Ni contents for more than 0.01%.On the other hand, when Ni contents are more than 0.80%, steel is hard Matter and its processability declines.Therefore, Ni contents are limited in the range of 0.01～0.80%.More preferably 0.10～0.40% Scope.
Ti：0.11～0.40%
Ti is to fix C, N and prevent from being sensitized by caused by Cr carbonitrides, and makes the element of corrosion resistance raising.And And, Ti makes corrosion resistance further improve by the composite effect with Nb described later.
Its effect is obtained by Ti contents for more than 0.11%.On the other hand, it is stainless when Ti contents are more than 0.40% Steel plate hardening, processability declines.Also, can on the surface generate Ti systems field trash and cause surface quality to decline.Therefore, Ti Content is set to 0.11～0.40% scope.More preferably 0.20～0.35% scope.
Nb：0.010～0.100%
Nb have be solid-solubilized in steel and by the effect of crystal grain grain refined.Due to the easily generation { 111 } near crystal boundary< 001>The crystal grain of orientation, so being accompanied by by crystal grain miniaturization caused by addition Nb, in recrystallization process, { 111 } face Recrystallization grain ratio increase.Thus, it is suppressed that increase intra-face anisotropy and be orientated the Goss that processability declines ({110}<001>) crystal grain generation, the intra-face anisotropy of tissue reduces.As a result, Elmin(by rolling direction and rolling Direction is set to L directions, D directions, C directions, the elongation of all directions into 45 degree of direction and rolling direction direction at a right angle Minimum of a value among rate) and rmin(minimum of a value among the r values of L, D, C all directions) increases, and processability is improved.Also, Nb passes through With the composite effect of Ti described later, corrosion resistance is set further to improve.Its effect is obtained by Nb contents for more than 0.010% Arrive.On the other hand, when Nb contents are more than 0.100%, ferrite-group stainless steel hardening, processability declines.Therefore, Nb contents It is set to 0.010～0.100% scope.More preferably 0.030～0.070% scope.
When the present invention is completed, it was found that add Ti and Nb by compound, improve can corrosion resistance.Its mechanism can Think as follows.It is known：Stainless corrosion is caused by the destruction that the local for being referred to as spot corrosion is passivated epithelium.As the generation of spot corrosion Reason, has and adds man-hour to apply caused by the difference of dependent variable to precipitate and steel mother metal and be formed in precipitate-steel in rolling etc. The local gap corrosion of the gap location of the near surface of parent material interface.MnS, Ti carbonitride is the representative analysis to form the gap Go out thing.Also, due to Ti carbonitrides it is thick, and the interface with straight line, so being formed at the gap location at the interface, anode Reaction intensively occurs, and the corrosion resistance of steel declines.It is well known, however, that：By relative to the compound addition Nb of Ti, obtaining the nitridation of Nb carbon Thing is attached to the precipitation form of the compound carbonitrides of Ti-Nb of Ti carbonitride peripheries.Thus obtained Ti-Nb composite carbons nitridation Thing is different with Ti carbonitrides from the interface of stainless steel mother metal, and it is not straight line to become.That is, divide because the total length at interface increases There is anode reaction scatteredly, so being difficult to spot corrosion, corrosion resistance is improved.
In order that the effect manifests and makes processability good, the content of Ti and Nb is needed respectively within the above range.It is more excellent Choosing, by ratio (Nb/Ti) of the Nb contents relative to Ti contents more than 0.10 and less than 0.30 is set to.Thus, corrosion resistance is entered One step is improved.Become abundant to the precipitation of Ti carbonitride peripheries by the way that more than 0.10, Nb carbonitrides will be set to than (Nb/Ti). In addition, by being set to less than 0.30 than (Nb/Ti), the carbonitride of independent Nb is difficult to separate out, Ti-Nb composite carbons are easily formed Nitride.
N：Less than 0.020%
N is the element being inevitably mixed in steel.But, when N content is more than 0.020%, corrosion resistance and processing Property can be remarkably decreased.Therefore, N content is set to less than 0.020%.More preferably less than 0.015%.
This concludes the description of required composition, but in the present invention, in addition, it is also possible to the appropriate unit containing described below Element.
Mo：0.01～0.30%
Mo has the effect that the resistance to crevice corrosion for making ferrite-group stainless steel is improved.Its effect is by the way that Mo contents are set to More than 0.01% and obtain.But, when Mo contents are more than 0.30%, not only its effect saturation, processability also declines.Therefore, In the case of addition Mo, Mo contents are set to into 0.01～0.30%.More preferably 0.03～0.10% scope.
Cu：0.01～0.50%
Cu has the effect that the toughness for making steel is improved.Its effect is obtained by Cu contents for more than 0.01%.On the other hand, When Cu contents are more than 0.50%, the toughness of steel declines, and processability declines.Therefore, in the case of addition Cu, Cu is contained Amount is set to 0.01～0.50%.More preferably 0.01%～it is less than 0.10%.More preferably 0.03～0.06%.
Co：0.01～0.50%
Co is the element for improving stainless resistance to crevice corrosion.The effect by Co contents by being set to more than 0.01% And obtain.But, when Co contents are more than 0.50%, its effect saturation, and processability decline.Therefore, in the feelings of addition Co Under condition, Co contents are set to into 0.01～0.50%.More preferably 0.03～0.30% scope.More preferably 0.05～ 0.10% scope.
W：0.01～0.50%
W is the element for improving the resistance to crevice corrosion of ferrite-group stainless steel.In order to obtain the effect, W content is preferred More than 0.01%.But, when its content is more than 0.50%, its effect saturation, and processability decline.Therefore, in the feelings of addition W Under condition, W content is set to into 0.01～0.50%.More preferably 0.03～0.30% scope.More preferably 0.05～ 0.10% scope.
V：0.01～0.25%
V is the element for improving the resistance to crevice corrosion of ferrite-group stainless steel.The effect is by the way that V content is set to More than 0.01% and obtain.On the other hand, when V content is more than 0.25%, its effect saturation, and cause the deterioration of processability. Therefore, V is defined in the range of 0.01～0.25%.More preferably 0.03～0.20% scope.More preferably 0.05 Less than～0.10% scope.
When the present invention is completed, it was found that：In the case of addition V, by relative to the summation of Ti contents and Nb contents Adjustment V content, improving effect by corrosion resistance caused by the compound addition of above-mentioned Ti and Nb becomes more notable.Its mechanism is unclear Chu, but be believed that as follows.
Due to containing V in steel, contain V in the carbonitride of Ti, Nb, formed Ti and V compound carbonitride ((Ti, V) (C, N)), the compound carbonitride ((Nb, V) (C, N)) of Nb and V, be further mixed in the compound carbonitrides of above-mentioned Ti-Nb The compound carbonitride ((Ti, Nb, V) (C, N)) of V.Due to becoming these carbonitrides, compared with not containing in the case of V, As the temperature drop for most promoting to separate out for separating out peak temperature.As a result, also there is grain in more low-temperature region to grow.Due to low Temperature area diffusion is slack-off, it is suppressed that the coarsening of each grain, carbonitride relative to Ti or Nb without V and theirs is compound Carbonitride (as general name, can be referred to as the compound carbonitrides of Ti-Nb), and each carbonitride containing V (as general name, can claim For the compound carbonitrides of Ti-Nb-V) become smaller size, and obtain more scattered precipitation form.It is respective compound After the size of carbonitride diminishes, the gap that man-hour formed between carbonitride-steel mother metal is added to diminish in rolling etc..Therefore, by Corrode in generation local gap is difficult to, and inhibit the generation of spot corrosion, so corrosion resistance is improved.
In order that the effect manifests and realize excellent corrosion resistance, and processability is set to become good, with Ti, Nb and V Content mode respectively within the above range is adjusted, while the ratio (Nb/Ti) by Nb contents relative to Ti contents is set to More than 0.10 and less than 0.30, and by the content of V relative to the content of Ti and the ratio (V/ (Ti+Nb)) of the summation of the content of Nb It is set to more than 0.20 and less than 1.00.Thus, corrosion resistance is further improved.By will than (V/ (Ti+Nb)) be set to 0.20 with On, the decline of (Ti, V) (C, N), the Precipitation Temperature of (Nb, V) (C, N) becomes notable.In addition, by being set to than (V/ (Ti+Nb)) Less than 1.00, the carbonitride of independent V is difficult to separate out, and easily forms the compound carbonitrides of Ti-Nb-V.
Zr：0.01～0.30%
Zr is identical with Ti, Nb, fixes and prevents by sensitization caused by Cr carbonitrides with by C, N, and makes corrosion resistance The effect of raising.Its effect is obtained by Zr contents for more than 0.01%.But, when Zr contents are more than 0.30%, can give birth to Into ZrO2Deng and produce surface damage.Therefore, in the case of addition Zr, Zr contents are set to into 0.01～0.30%.More preferably For 0.01～0.20% scope.
B：0.0003～0.0030%
B is the element for improving hot-workability, secondary workability.It is known to Ti addition steel addition B be effective.The effect Obtained by the way that B content is set to into more than 0.0003%.On the other hand, when B content is more than 0.0030%, processability declines. Therefore, in the case of addition B, B content is located at into 0.0003～0.0030% scope.More preferably 0.0010～ 0.0025% scope.More preferably 0.0015～0.0020% scope.
Mg：0.0005～0.0030%
Mg together with Al forms Mg oxides and works as deoxidier in molten steel.The effect is by the way that Mg contents are set Obtain for more than 0.0005%.On the other hand, when Mg contents are more than 0.0030%, the toughness of steel declines, and manufacturing declines. Therefore, in the case of addition Mg, Mg contents are limited in the range of 0.0005～0.0030%.
Ca：0.0003～0.0030%
Ca is closed for the crystallization for preventing the incidental Ti systems field trash in continuously casting separates out nozzle caused by institute Fill in effective composition.The effect is obtained by Ca contents for more than 0.0003%.On the other hand, when Ca contents exceed When 0.0030%, the toughness of steel declines, and manufacturing declines.In addition, when Ca contents are more than 0.0030%, due to the precipitation of CaS, Corrosion resistance declines.Therefore, in the case of addition Ca, Ca contents are limited in the range of 0.0003～0.0030%.It is more excellent Elect 0.0010～0.0020% scope as.
Y：0.001～0.20%
Y is that the viscosity for making molten steel reduces, and makes the element of cleanliness factor raising.The effect is more than 0.001% by Y contents And obtain.On the other hand, when Y contents are more than 0.20%, its effect saturation, and processability decline.Therefore, addition Y's In the case of, Y contents are limited in the range of 0.001～0.20%.More preferably 0.001～0.10% scope.
REM (rare earth metal)：0.001～0.10%
REM (rare earth metals：The element of the atomic numbers such as La, Ce, Nd 57～71) improve high-temperature oxidation Element.The effect is obtained by REM contents for more than 0.001%.On the other hand, when REM contents are more than 0.10%, not only Its effect saturation, can also produce surface defect in hot rolling.Therefore, in the case of addition REM, REM contents are limited to In the range of 0.001～0.10%.More preferably 0.005～0.05% scope.
Sn、Sb：0.001～0.50%
These elements are for caused resistance to strip defect (ridging) property of promotion institute of the generation of Zona transformans during rolling Raising is effective.The effect by these elements in a certain content obtain for more than 0.001%.But, when this The content of a little elements respectively more than 0.50% when, not only its effect saturation, processability also further declines.Therefore, addition Sn, In the case of Sb, respective content is set to into 0.001～0.50%.It is further preferred that respective content is 0.003～0.20% Scope.
Remainder beyond above composition is Fe and inevitable impurity.
Then, the preferred manufacture method of the ferrite series stainless steel plate of the present invention is illustrated.By converter, electric furnace, vacuum The steel of method melting mentioned component composition known to smelting furnace etc., and (the casting of steel former material is made by continuous metal cast process or ingot casting-cogging method Base).Hot rolling is carried out as follows：After the steel former material is heated to into 1000 DEG C～1200 DEG C, finishing temperature is being set to into 700 DEG C Under conditions of～1000 DEG C, thickness of slab becomes 2.0mm～5.0mm.By the hot rolled steel plate being so fabricated by 800 DEG C～1100 DEG C At a temperature of anneal and carry out pickling, then, carry out cold rolling, carry out cold-reduced sheet annealing at a temperature of 700 DEG C～1000 DEG C. Pickling is carried out after cold-reduced sheet annealing, except descale.Can also be to carrying out skin-pass except the cold-rolled steel sheet after descale.
Embodiment
The melting in vacuum melting furnace has the No.1 of table 1 (by table 1-1, table 1-2, table 1-3 included together as table 1) After the steel of the composition shown in～82, the bloom of 30kg is cast as.The bloom is heated to after 1050 DEG C of temperature, in finish to gauge temperature Degree：Hot rolling is carried out at 900 DEG C, thickness of slab is rolled into：The hot rolled steel plate of 5mm.Afterwards, carry out at 1000～1050 DEG C in an ar atmosphere The annealing of one minute, being impregnated in sulfuric acid carries out after pickling, by cold rolling thickness of slab being become：The cold-rolled steel sheet of 1.0mm.What is obtained is cold Rolled steel plate carries out in an ar atmosphere the annealing of one minute at 900 DEG C, by neutral salt electrolysis, nitre fluoric acid dipping and nitrate Electrolysis carries out pickling and obtains cold rolled annealed pickled plate.
In addition, in vacuum melting furnace No.83 of the melting with table 1, composition shown in 84 ferrite-group stainless steel Afterwards, it is cast as the bloom of 30kg.The bloom is heated to after 1050 DEG C of temperature, in finishing temperature：Hot rolling is carried out at 900 DEG C, Roll into thickness of slab：The hot rolled steel plate of 5mm.Afterwards, the annealing of 12 hours is carried out at 800～850 DEG C in an atmosphere, is impregnated into sulfuric acid In carry out after pickling, by cold rolling thickness of slab being become：The cold-reduced sheet of 1.0mm.The cold-rolled steel sheet for obtaining is in an ar atmosphere at 800 DEG C The annealing of one minute is carried out, pickling is carried out and is obtained cold rolling moving back by neutral salt electrolysis, nitre fluoric acid dipping and nitrate electrolysis Fiery pickled plate.
Additionally, the test No.82 of table 1,83 being respectively the suitable steel of SUH409L, the suitable steel of SUS430.
By cutting off processing, the cold rolled annealed pickled plate of the ferrite-group stainless steel obtained with above manufacturing condition is cut out 80×60mm.After cutting out, till being ground to No. 320 with diamond dust pouncing paper, and carry out using the degreasing of acetone.By what is obtained The end of steel plate and sealing backside, and to incline：60 ° are configured on cycle corrosion test machine.In corrosion testing machine, by 0.1 Quality %NaCl-0.5 mass %H2O2The spraying (30 minutes, 35 DEG C, 98%RH (humidity)) of the aqueous solution, be dried (1 hour, 60 DEG C, 30%RH), and moistening (1 hour, 40 DEG C, 95%RH) as a circulation, carry out the corrosion test of 240 circulations.This is Think poorly of～corrosion of the corrosion resistance of middle Cr systems steel grade promotes test method(s).After test, using 10% diammonium hydrogen citrate solution Corrosion product is removed, and determines corrosion weight loss.It is 1.0g/m by corrosion weight loss2It is (qualified that following steel plate is evaluated as " ◎ "：It is non- Chang Youyi), will be more than 1.0g/m2～5.0g/m2It is (qualified that following steel plate is evaluated as "○"：It is especially excellent), will be more than 5.0g/ m2～8.0g/m2It is (qualified that following steel plate is evaluated as " "：It is excellent), will be more than 8.0g/m2～16.0g/m2Following steel plate is commented Valency is " △ " (qualified), will compare 16.0g/m2Big steel plate is evaluated as " ▲ " (unqualified).
Also, will be rolling direction and rolling direction into 45 degree in No. 13B test piece collection specified in JIS Z 2201 Direction and the direction with rolling direction at a right angle, and carry out tension test at normal temperatures, evaluate processability.By ElminFor More than 33% and rminSteel plate for more than 1.1 is evaluated as "○" (qualified), by ElminLess than 33% or rminSteel plate less than 1.1 It is evaluated as " ▲ " (unqualified).
The result for obtaining is as shown in table 1.Understand：Invention steel test No.1～65 corrosion resistance be evaluated as "○" or " " or " △ ", and processability is evaluated as "○", corrosion resistance and excellent in workability.Particularly meet than (V/ (Ti+Nb)) Evaluation for test No.34～47,55～65 corrosion resistance and processability of more than 0.20 and 1.00 invention below steel is equal For "○".
In FIG, by the result of example of the present invention, Ti contents be the scope of the invention outside comparative example result and Nb contents The result of the comparative example outside for the scope of the invention collects in the graph.As shown in Figure 1, it is known that meet formula in the content of Ti and Nb (1) in the case of, with better corrosion resistance.
In fig. 2, the example of the present invention of formula (1) is met for Ti and Nb contents, will with the summation of V content, Ti and Nb contents The result of corrosion resistance collects in the graph.As shown in Figure 2, it is known that：Meet the situation of formula (2) in the content of Ti, Nb and V Under, with better corrosion resistance.
Meet than (V/ (Ti+Nb)) be more than 0.20 and 1.00 invention below steel test No.34～47,55～65 The evaluation of corrosion resistance and processability is "○".
Due to test No.66,68,70,71 comparative example respective Cr, Ni, Ti content than the present invention composition range It is low, so corrosion-resistant.Due to test the respective Cr of comparative example of No.67,69,72,73,76,77,78,79,80, Ni, Ti, Nb, V content are higher than the composition range of the present invention, so poor in processability.Contain due to testing No.74, the Nb of 75 comparative example Amount is lower than the composition range of the present invention, so corrosion resistance, processability are poor.Because the C for testing the comparative example of No.81 contains Amount is higher than the composition range of the present invention, so corrosion resistance and processability are poor.Because the comparative example for testing No.82 is not contained Nb, in addition, Cr contents are also low than the scope of the invention, so corrosion-resistant.Nb is not contained due to testing No.83,84 comparative example, In addition, C content, N content and Cr contents are higher than the scope of the invention, so poor in processability.
[table 1-1]
※【Corrosion resistance】It is 1.0g/m by corrosion weight loss after the corrosion test of 240 circulations2Following steel plate is evaluated as " ◎ " is (qualified：It is very excellent),
Will be more than 1.0g/m2～5.0g/m2It is (qualified that following steel plate is evaluated as "○"：It is especially excellent), will be more than 5.0g/ m2～8.0g/m2It is (qualified that following steel plate is evaluated as " "：It is excellent),
Will be more than 8.0g/m2～16.0g/m2Following steel plate is evaluated as " △ " (qualified), will compare 16.0g/m2Big steel plate It is evaluated as " ▲ " (unqualified).
※【Processability】By tension test at normal temperatures, by ElminFor more than 33% and rminFor more than 1.1 steel plate "○" (qualified) is evaluated as, by ElminLess than 33% or rminSteel plate less than 1.1 is evaluated as " ▲ " (unqualified).
※ underscores are represented outside the scope of the present invention.
[table 1-2]
※【Corrosion resistance】After the corrosion test of 240 circulations, steel plate of the corrosion weight loss for below 1.0g/m2 is evaluated as " ◎ " is (qualified：It is very excellent),
Will be more than 1.0g/m2～5.0g/m2It is (qualified that following steel plate is evaluated as "○"：It is especially excellent), will be more than 5.0g/ m2～8.0g/m2It is (qualified that following steel plate is evaluated as " "：It is excellent),
Will be more than 8.0g/m2～16.0g/m2Following steel plate is evaluated as " △ " (qualified), will compare 16.0g/m2Big steel plate It is evaluated as " ▲ " (unqualified).
※【Processability】By tension test at normal temperatures, by ElminFor more than 33% and rminFor more than 1.1 steel plate "○" (qualified) is evaluated as, by ElminLess than 33% or rminSteel plate less than 1.1 is evaluated as " ▲ " (unqualified).
※ underscores are represented outside the scope of the present invention.
[table 1-3]
※【Corrosion resistance】It is 1.0g/m by corrosion weight loss after the corrosion test of 240 circulations2Following steel plate is evaluated as " ◎ " is (qualified：It is very excellent),
Will be more than 1.0g/m2～5.0g/m2It is (qualified that following steel plate is evaluated as "○"：It is especially excellent), will be more than 5.0g/ m2～8.0g/m2It is (qualified that following steel plate is evaluated as " "：It is excellent),
Will be more than 8.0g/m2～16.0g/m2Following steel plate is evaluated as " △ " (qualified), will compare 16.0g/m2Big steel plate It is evaluated as " ▲ " (unqualified).
※【Processability】By tension test at normal temperatures, by ElminFor more than 33% and rminFor more than 1.1 steel plate "○" (qualified) is evaluated as, by ElminLess than 33% or rminSteel plate less than 1.1 is evaluated as " ▲ " (unqualified).
※ underscores are represented outside the scope of the present invention.
Industrial applicability
According to the present invention, due to corrosion resistance and excellent in workability, can be suitably used in headed by the inner panel of elevator, Interior trim, conduit cover, muffler (muffler) cutter, cabinet, household appliances part, office supplies part, automobile inside are used The purposes such as the lid in part, automobile exhaust pipeline, building materials and gutter.

Claims (6)

1. a kind of ferrite series stainless steel plate, it is characterised in that
In terms of quality %, containing C：Less than 0.025%, Si：0.01～1.00%, Mn：0.05～1.00%, P：0.020～ 0.040%th, S：Less than 0.030%, Al：0.001～0.100%, Cr：12.5～14.4%, Ni：0.01～0.80%, Ti： 0.11～0.40%, Nb：0.010～0.100% and N：Less than 0.020%, remainder is by Fe and inevitable impurity Constitute.
2. ferrite series stainless steel plate according to claim 1, it is characterised in that
Ti contents and Nb contents meet following formula (1),
0.10≤Nb/Ti≤0.30(1)
Element mark in formula (1) refers to the content of each element.
3. ferrite series stainless steel plate according to claim 1 and 2, it is characterised in that
In terms of quality %, also containing selected from Mo：0.01～0.30%, Cu：0.01～0.50%, Co：0.01～0.50% and W：0.01～0.50% one or more.
4. the ferrite series stainless steel plate according to any one of claims 1 to 3, it is characterised in that
In terms of quality %, also containing selected from V：0.01～0.25%, Zr：0.01～0.30%, B：0.0003～0.0030%, Mg：0.0005～0.0030%, Ca：0.0003～0.0030%, Y：0.001～0.20% and REM is rare earth metal： 0.001～0.10% one or more.
5. the ferrite series stainless steel plate according to any one of Claims 1 to 4, it is characterised in that
In terms of quality %, also containing selected from Sn：0.001～0.50% and Sb：0.001～0.50% one or two.
6. the ferrite series stainless steel plate according to any one of Claims 1 to 5, it is characterised in that
In terms of quality %, containing V：0.01～0.25%,
Ti contents and Nb contents meet following formula (1),
Ti contents, Nb contents and V content also meet following formula (2),
0.10≤Nb/Ti≤0.30 (1)
0.20≤V/(Ti+Nb)≤1.00 (2)
Element mark in formula (1), (2) refers to the content of each element.
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