CN101573466A - Ferritic stainless steel with execellent corrosion resistnace and excellent discoloration resistance - Google Patents

Ferritic stainless steel with execellent corrosion resistnace and excellent discoloration resistance Download PDF

Info

Publication number
CN101573466A
CN101573466A CNA2007800486997A CN200780048699A CN101573466A CN 101573466 A CN101573466 A CN 101573466A CN A2007800486997 A CNA2007800486997 A CN A2007800486997A CN 200780048699 A CN200780048699 A CN 200780048699A CN 101573466 A CN101573466 A CN 101573466A
Authority
CN
China
Prior art keywords
stainless steel
ferritic stainless
steel
still less
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2007800486997A
Other languages
Chinese (zh)
Other versions
CN101573466B (en
Inventor
李庸得
李龙宪
金光泰
李钟锡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of CN101573466A publication Critical patent/CN101573466A/en
Application granted granted Critical
Publication of CN101573466B publication Critical patent/CN101573466B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The present invention relates to a high Cr ferritic stainless steel substituting Cr, Cu, Ti, Nb, etc, for an austenitic steel containing expensive Ni high corrosion resistance ferritic stainless steel and to a high corrosion resistance ferritic stainless steel with the same or more corrosion resistance as compared to the type 304 steel. The ferritic stainless steel is made of C of 0.01% or less, Si of 0.2 to 1.0%, Mn of 0.3% or less, Cr of 20 to 23%, Ni of 0.2 to 0.4%, N of 0.01% or less, Al of 0.03 to 0.10%, S 0.002% or less, Cu of 0.3 to 0.5%, Zr of 0.02 to 0.06%, Ti of 0.2 to 0.4% (Ti/(C+N) > 20), and Nb of 0.06 to 0.45% (Nb/(C+N)>28)), and Fe and inevitable impurities as the remaining components, wherein a unit is mass %. Also, a manufacturing method of performing a cold rolling and a surface polishing on the ferritic stainless steel is provided.

Description

Ferritic stainless steel with superior corrosion resistance and good discoloration-resistant
Technical field
The present invention relates to a kind of ferritic stainless steel with superior corrosion resistance and good discoloration-resistant.More particularly, the present invention relates to a kind of element that can replace Ni raising erosion resistance contains the austenitic stainless steel of expensive Ni element with replacement high chromium content ferrite stainless steel that contains, the invention still further relates to a kind of ferritic stainless steel with superior corrosion resistance and good discoloration-resistant, described ferritic stainless steel control Ti, Nb, Cu, Ni, Si and Zr component are to have the identical erosion resistance of erosion resistance with the 304 steel grade materials that are used as material of construction.
Background technology
Existing 304 austenitic stainless steels by 18%Cr-8%Ni as main component, because the content height of expensive Ni, so there is the low problem of price competitiveness in existing 304 austenitic stainless steels.
In addition, owing to contain expensive Mo element with existing 436L ferritic stainless steel that 304 austenitic stainless steels have an identical erosion resistance, so also have the low problem of price competitiveness because of the manufacturing cost increase causes the 436L ferritic stainless steel.
In order to replace 304 steel grades or the 436L steel grade that causes manufacturing cost to increase owing to a large amount of expensive Ni or Mo component, proposed several different methods and reduced Ni or Mo.Yet, according to such method, can significantly reduce manufacturing cost by reducing Ni or Mo, problem is to be difficult to obtain the erosion resistance of user expectation.
Summary of the invention
Technical problem
The invention is intended to address this problem.The object of the present invention is to provide a kind of by adding the high chromium content ferrite stainless steel that element such as Cr, Cu, Si, Ni, Zr and compound interpolation Ti and Nb have superior corrosion resistance and good discoloration-resistant, thereby add Ni and Mo that elements such as Cr, Cu, Si, Ni, Zr are substituted in the costliness in existing 304 steel grades (18Cr-8Ni) and the 436L steel grade (18Cr-1.2Mo-0.2Ti), it is 20 or higher that compound interpolation Ti and Nb make Ti (C+N), or to make Nb (C+N) be 28 or higher, thereby make C and N element stable.
In addition, for the present invention, another object of the present invention is to provide the steel of a kind of 21%Cr-0.3%Ti-0.06%Nb-0.5%Si-0.4%Cu-0.3%Ni-0.02%Zr-0.007% of having C-0.008%N component as the exemplary alloy component, and provide a kind of cold rolling process and surface polishing method, thereby improve the erosion resistance and the high temperature discoloration-resistant of described steel.
Purpose of the present invention is not limited to above-mentioned purpose, and by following detailed, those skilled in the art will be well understood to other purpose of the present invention.
Technical scheme
In order to realize described purpose, the ferritic stainless steel that has superior corrosion resistance and good discoloration-resistant is according to an embodiment of the invention made by following component: 0.01% or C still less; 0.01% or N still less; 0.2% to 0.4% Ti; 0.05% to 0.45% Nb; 0.2% to 1.0% Si; 0.3% or Mn still less; 20% to 23% Cr; 0.2% to 0.4% Ni; 0.3% to 0.5% Cu; 0.03% to 0.10% AL; 0.002% or S still less; 0.02% to 0.06% Zr; Ti/ (C+N) be 20 or higher or Nb/ (C+N) be 28 or higher; Fe and unavoidable impurities are as other component, and wherein, unit is quality %.
In addition, for the present invention, provide a kind of ferritic stainless steel with superior corrosion resistance and good discoloration-resistant, at 500 ℃ down after the heating 90 minutes, when the colourimeter that meets ASTM D2244 in utilization was measured color, this ferritic stainless steel was present in a *Value is less than 11 and b *Value is greater than in 11 the zone.
In addition, for the present invention, provide a kind of ferritic stainless steel with superior corrosion resistance and good discoloration-resistant, wherein, Nb is 0.1% or still less, Si is 0.45% to 0.5%, and annealing grains is of a size of No. 7.5, ASTM or higher.
In addition, for the present invention, a kind of ferritic stainless steel with superior corrosion resistance and good discoloration-resistant is provided, wherein, under 320 orders (mesh) or higher round brush type, ferritic stainless steel is carried out the fine rule polishing, and cold rolling surface roughness Ra value and Rz value are restricted to 0.25 and 1.70 respectively.
Beneficial effect
As mentioned above, the invention provides a kind of by adding the ferritic stainless steel of the erosion resistance that Ni that cheap chromium (Cr), copper (Cu), silicon (Si), zirconium (Zr), titanium (Ti) or niobium (Nb) etc. replace costliness had with the raising of 304 steel grade pars, with 304 steel grades of replacement as austenitic steel.In addition, provide a kind of steel has been carried out suitable cold rolling and roll shape surface finish to have the manufacture method of superior corrosion resistance.
Description of drawings
(a) of Fig. 1 and (b) be light micrograph according to the surface finish condition of steel of the present invention, wherein, (a) of Fig. 1 shows the surface picture of the increase of polishing mark of break (polishing discontinuous) length after using sand belt, and (b) of Fig. 1 shows the surface picture that the polishing mark of break length after using round brush reduces.
Embodiment
Hereinafter, feature of the present invention and effect will be described.At first, compositional range of the present invention and limitation reason will be described.
C is an austenite former.When adding C, hot strength improves.Yet when adding C too much, C and Cr reaction produce chromium carbide, thereby reduce erosion resistance, ductility and the weldability of ferritic steel.Therefore, typically, C is restricted to 0.01% or still less, this is possible low levels.
N is an austenite phase stable element.The advantage of N is to replace the Ni element and improves intensity and pitting corrosion resistance, and the shortcoming of N is to make ductility and deteriorated workability.Therefore, in the present invention, N is restricted to 0.01% or still less.
Ti utilize Ti (C, N) precipitation makes C element and N element stable, suppress chromium carbide at high temperature separate out the raising erosion resistance, and the control recrystallization texture improves workability when carrying out annealing thermal treatment.Yet, when adding Ti too much, cause the problem of deteriorated workability and surface imperfection.Therefore, Ti is restricted to 0.2% to 0.4%, specifically, Ti/ (C+N) is 20 or higher.
Nb utilizes Nb (C, N) precipitation is stablized C element and N element, suppress chromium carbide at high temperature separate out the raising erosion resistance, control recrystallization texture when carrying out annealing thermal treatment, and when it is processed as the material that is used for elevator, make the crystal grain granular to prevent the appearance of orange peel phenomenon.Yet, because when adding Nb too much, deteriorated workability and for example corrugated surface imperfection occurs, so Nb is controlled to be 0.05% to 0.45%, specifically, Nb/ (C+N) is 28 or higher.
Mn is the austenite phase stable element as nitrogen, and is the element that replaces Ni.When Mn was added in the ferritic steel, Mn made austenite be in the quasi-stable state mutually and improves intensity, yet reduction can be with industrial and commercial bank.Therefore, Mn is restricted to 0.3% or still less.
Cr is that oxide film forms the promotion element and makes erosion resistance bring up to the level identical with 304 steel grades.Need interpolation 21% or more Cr to replace the Mo element of 436L steel grade.Yet, when adding Cr too much, produce densified oxidation scale during owing to the execution hot rolling, cause bonding defect to increase.Therefore, Cr is restricted to 23%.
Ni be austenite phase stable element as C and N, and Ni reduces the element that corrosion speed improves erosion resistance.Yet Ni is expensive element, therefore, considers economical efficiency, and Ni is restricted to 0.2% to 0.4%.
Si is 0.2% or more, thereby improves high-temperature oxidation resistance, and improves erosion resistance by reinforce passive film in stainless steel.Yet when adding Si too much, Si makes the ductility deterioration, therefore, Si is restricted to 1.0% or still less.
The impurity element that the S amount of being is considerably less.When carrying out hot rolling, thereby S is the principal element that segregation causes processing crackle in the grain boundary.Therefore, S is restricted to 0.002% or still less, this is possible low levels.
Cu reduces the element that corrosion propagation speed improves erosion resistance.Yet when adding Cu too much, Cu is the element that makes high-temperature oxidation resistance and hot deteriorated workability.Therefore, Cu is restricted to 0.3% to 0.5%.
Al is the deoxidizer element of control grain-size.When adding Al too much, can be in continuous casting process owing to inclusion makes nozzle clogging.Therefore, Al is restricted to 0.10% or still less.
Zr is the element that improves the impelling strength of welding portion.When adding Zr too much, can be in continuous casting process owing to inclusion makes nozzle clogging.Therefore, Zr is restricted to 0.06% or still less.
In following table 1, for the Ti/ in the essentially consist that changes 21%Cr-0.3%Ti-0.006%C-0.006%N-0.3%Ni-0.5%Si-0.4%Cu (C+N) mark, and in order to obtain the erosion resistance with 304 steel grades and 436L steel grade par, high chromium content ferrite stainless steel and 304 steel grades that replace Ni and Mo with elements such as Cr, Cu are compared, and in table 1, listed correlated example.
Every kind of steel with compared steel is melted and casts in mold according to one embodiment of present invention.Then, they being carried out hot rolling, cold rolling, annealing and pickling is the cold rolling strap of 1.0mm to make thickness.Anti-corrosion test result to cold rolling strap lists in table 1.
Table 1
According to one embodiment of present invention with the physical properties of the steel of compared steel
Steel grade Cr Si Cu Ni Mn C N Ti Nb Zr Ti，Nb/(C+N) CPT
304 18.3 0.49 0.2 8.1 1.06 0.049 0.043 - - - 25.0 29.4
Compared steel 1 18.5 0.44 - - 0.2 0.015 0.01 - 0.47 - 25.0 20.1
Compared steel 2 21.0 0.10 - - 0.2 0.006 0.006 0.30 - - 25.0 25.0
Compared steel 3 21.0 0.45 - - 0.2 0.006 0.006 0.30 - - 25.0 25.6
Compared steel 4 21.0 0.10 0.4 0.3 0.2 0.006 0.006 0.30 - - 25.0 28.1
Compared steel 5 21.0 0.10 0.4 0.3 0.2 0.006 0.006 - 0.34 - 28.3 29.8
Compared steel 6 21.0 0.45 - 0.4 0.2 0.006 0.006 0.30 - - 25.0 30.5
Compared steel 7 21.0 0.45 0.4 0.3 0.2 0.006 0.006 0.30 - - 25.0 35.1
Compared steel 8 21.0 0.45 0.4 0.3 0.2 0.006 0.006 - 0.34 - 28.3 34.3
The present invention 21.0 0.45 0.4 0.32 0.21 0.005 0.0051 0.27 0.06 0.02 32.4 35.3
CPT: critical pitting temperature
Critical pitting temperature (CPT) is meant such temperature, that is, sample is put into the NaCl solution of 1M (mole) and sample is applied+300mV, and when comparing with mercurous chloride electrode, the current density of sample reaches 100 μ A/cm 2The time temperature.Observe the result in the table 1, what can understand is, because the nickel of interpolation 8% makes that very the CPT of expensive austenite 304 steel grades is 29.4 ℃.Austenite 304 steel grades are used as the inside and outside material of common building.
Usually, when austenite 304 steel grades are used as the inside and outside material of common building, because the external corrosion environment can cause the corrosion of 304 steel grades owing to exotic attached to the surface of 304 steel grades.Therefore, should periodically clean steel.In order to have enough anti-sanitising agent abilities, in repetition salt solution spray test, should not get rusty based on ISO14993.In order to satisfy such standard, 32 ℃ of CPT should exceeds.
The invention provides and a kind ofly have superior corrosion resistance and can be used in ferritic stainless steel in the employed environment of common 304 steel grades, described ferritic stainless steel is adding 21% or more Cr and the very a spot of element of control when not adding expensive nickel.
As understanding from table 1, have 19% or the situation of the compared steel 1 of still less Cr under, CPT is 20.1 ℃.Compare with 304 steel grades, what can understand is that this CPT is very low.When as when the content of Cr is increased to 21% in compared steel 2 and compared steel 3, CPT is increased to 25 ℃ significantly.
Compared steel 4 and compared steel 5 are stabilizing elements and have added Ti and Nb respectively.Compare with compared steel 2, they are added with very a spot of Cu and Ni, thereby their CPT is increased to 28.1 ℃ and 29.8 ℃ respectively.Yet, because Si content is low to moderate 0.1% level, so the not enough high erosion resistance of erosion resistance that obtains than 304 steel grades.What therefore, can understand is by the content of increase Si and add very a spot of Cu and Ni simultaneously and improve erosion resistance.
Compare with compared steel 3, the CPT that has 0.45% Si and be added with the compared steel 6 of small amount of N i is elevated to 30.2 ℃.Yet, to compare with 304 steel grades, its erosion resistance is still not enough.
On the other hand, steel according to an embodiment of the invention is stabilizing element and is the steel of a kind of compound interpolation Ti and Nb.Described ladle contains 0.3% Ti and 0.06% Nb, and Si content is increased to 0.45%.Under the situation of steel according to an embodiment of the invention, what can understand is that critical pitting temperature (CPT) is about 34 ℃ to 35 ℃, and has obtained the corrosion-resistant higher erosion resistance than 304 steel grades.This explanation is that the content of Si in 21% the steel increases to 0.45% and during as interpolation Cu and Ni, erosion resistance significantly improves at Cr.
Under the situation of building interior and outer material, carry out bending operation usually.At this moment, when crystal grain is big, orange peel phenomenon occurs, thereby damage occurs the pattern that forms on the surface.The present invention is the investigation surface after bending has the steel of various grain sizes, orange peel phenomenon whether occurs with investigation.Its result is shown in the table 2.
Table 2
Degree according to the appearance orange peel phenomenon of the grain-size of steel
{。##.##1}, 6 6.5 7.0 7.5 Equiax crystal (continuously cast bloom)
Compared steel 4 (21Cr-0.10Si) × × △ ○ About 30%
The present invention (21Cr-Nb+0.45Si) × × ○ ○ About 40%
Zero: orange peel do not occur, △: orange peel is unintelligible, *: orange peel appears
Observe the result of table 2, what can understand is according to grain-size, and the appearance of orange peel is different.When grain-size is numbered 7.5 or when higher, what can understand is orange peel not occur based on American Society Testing and Materials (ASTM).Therefore, when adding 0.06% or during more Nb, compare with TiC, the NbC segregation is at high temperature more stable and suppressed the growth of crystal grain, thereby can obtain meticulous crystal grain when execution is annealed.In addition, in steel according to an embodiment of the invention, the content of Si is higher by 0.45% than existing steel (Si of compared steel 4:0.10%).Because when carrying out continuous casting, the equiax crystal of slab is about 40%, so improved workability (for example, bending process etc.) significantly.
When steel is used as material of construction, must need the fine rule polishing is carried out on the surface.In following table 3, relatively and estimated the erosion resistance of the steel according to an embodiment of the invention that changes according to surface polishing method.
For table 3, come the execution list mirror polish by the mode of round brush, so that the surface roughness Ra value is 0.25 or lower, thereby can obtain superior corrosion resistance.Here, measured surface imperfection length is, utilizing enlargement ratio is after three positions of opticmicroscope random shooting of 1000 times, the value of the surface imperfection length addition that will exist in each glazed surface.
Table 3
Steel is because the change in corrosion resistance that the surface finish condition causes according to an embodiment of the invention
When using sand belt, the coarse and reason that defect length increases of surfaceness is, occurs manyly can causing the corroded surface defective when using sand belt in the glossing process.For this reason, should utilize the mode of round brush that the surface finish of ferritic steel is softened.
Fig. 1 shows after utilizing the sand belt glazed surface and utilizes round brush glazed surface surface picture afterwards.(a) among Fig. 1 and (b) be light micrograph according to the surface finish condition of steel of the present invention.Here, the length that is to use sand belt to polish mark of break afterwards that can understand by (a) among Fig. 1 increases, and the length that is to use round brush to polish mark of break afterwards that can understand by (b) among Fig. 1 reduces.
When using sand belt, have on the surface and tear phenomenon greatly.In other words, when utilizing the sand belt glazed surface, defect length surpasses 2.58mm.Yet what can understand is, when using round brush and mesh to be 320 (hole counts of per 1 inch screen cloth), defect length is decreased to 0.67mm significantly, and erosion resistance improves greatly.
In addition, the present inventor finds by experimental result repeatedly, when carrying out cold-rolling treatment, when cold rolling draft is 70% or when lower, the defective shown in (b) among Fig. 1 occurs.If such defective is arranged in the steel, the erosion resistance deterioration.Therefore, in order to improve erosion resistance, discovery be that the original depth of hot rolling band should be thick, and should adopt 70% or higher draft.
Table 4
The Zr element exerts an influence to the impelling strength of the welding portion of steel according to an embodiment of the invention
{。##.##1}, Erichsen value (mm) Impact energy (joule ,-40 ℃)
The steel that does not contain Zr 10.3 19
The steel that contains 0.02% Zr 10.6 22
Wherein, Erichsen value (erichsen value) expression is by carrying out the value that the Erichsen test obtains to various steel.Erichsen test is such test, that is, the steel of experimental subjects is made after the thin plate, described thin plate applying load is measured the changing value of steel.
When making steel according to an embodiment of the invention and described steel is applied in the pipeline of cold-zone (cold area), should carry out welding, wherein, steel is the steel that contains Zr.Therefore, when carrying out welding, welding portion impelling strength at low temperatures should be good.
Shown in the result at table 4, because steel according to an embodiment of the invention contains 0.02% Zr element, so compare with the steel that does not contain Zr, steel of the present invention shows good impelling strength.When carrying out welding, separate out by Zr for consolidated structure equiax crystal nuclear is increased, make that crystal grain is meticulous and impelling strength is good.
Table 5
The influence that Cr element, Si element produce steel according to an embodiment of the invention
Figure A20078004869900111
Zero: variable color does not appear, *: variable color appears
When the gas grill, the surface discolouration of ferrite 439 steel grades etc. is faster than the surface discolouration of 304 steel grades under heat.Yet under the situation of steel according to an embodiment of the invention, Cr and Si are increased to as shown in table 5, thereby can be clear that described steel has good discoloration-resistant.Therefore, (21Cr-Ti, when Nb-0.45Si) being used as the gas grill that need not process especially, described steel can obtain the discoloration-resistant identical with the discoloration-resistant of 304 steel grades when steel according to an embodiment of the invention.
For steel according to an embodiment of the invention, when utilization meets the colourimeter of ASTM D2244 and when the mode of tube-surface net shape is not measured color, can obtain to have the ferritic stainless steel of good discoloration-resistant, after 500 ℃ were heated 90 minutes down, described stainless steel was present in a *Value is less than 11 and b *Value is greater than in 11 the zone.
Though illustrated and described exemplary embodiment of the present invention, but those skilled in the art should understand that, without departing from the principles and spirit of the present invention, can change embodiment, scope of the present invention limits in claim and equivalent thereof.

Claims (8)

1, a kind of ferritic stainless steel with superior corrosion resistance and good discoloration-resistant, described ferritic stainless steel is made by following component: 0.01% or C still less; 0.01% or N still less; 0.2% to 0.4% Ti; 0.05% to 0.45% Nb; 0.2% to 1.0% Si; 0.3% or Mn still less; 21% to 23% Cr; 0.2% to 0.4% Ni; 0.3% to 0.5% Cu; 0.03% to 0.10% Al; 0.002% or S still less; 0.02% to 0.06% Zr; Ti/ (C+N) be 20 or higher or Nb/ (C+N) be 28 or higher; Fe and unavoidable impurities are as other component, and wherein, unit is quality %.
2, ferritic stainless steel as claimed in claim 1, wherein, Si is 0.45% to 0.5%.
3, ferritic stainless steel as claimed in claim 1, wherein, Cr be 21% and Si be 0.45% to 0.5%, and described ferritic stainless steel is at 500 ℃ down after the heating 90 minutes, when utilization met the colourimeter measurement color of ASTM D2244, described ferritic stainless steel was present in a *Value is less than 11 and b *Value is greater than in 11 the zone.
4, ferritic stainless steel as claimed in claim 1, wherein, Nb is 0.1% or still less, Si is 0.45% to 0.5%, annealing grains is of a size of No. 7.5, ASTM or higher.
5, a kind of by ferritic stainless steel being carried out the manufacture method of the ferritic stainless steel of cold-rolling process and processing of surface polishing, described ferritic stainless steel is made by the ferritic stainless steel with superior corrosion resistance and good discoloration-resistant, and is made by following component: 0.01% or C still less; 0.01% or N still less; 0.2% to 0.4% Ti; 0.05% to 0.45% Nb; 0.2% to 1.0% Si; 0.3% or Mn still less; 21% to 23% Cr; 0.2% to 0.4% Ni; 0.3% to 0.5% Cu; 0.03% to 0.10% Al; 0.002% or S still less; 0.02% to 0.06% Zr; Ti/ (C+N) be 20 or higher or Nb/ (C+N) be 28 or higher; Fe and unavoidable impurities are as other component, and wherein, unit is quality %, said method comprising the steps of:
With 70% or higher cold rolling draft carry out cold-rolling process;
Under 320 orders or higher round brush type, carry out processing of surface polishing with the mode of fine rule surface finish, so that cold rolling surface roughness Ra value and Rz value are restricted to 0.25 and 1.70 respectively.
6, manufacture method as claimed in claim 5, wherein, Si is 0.45% to 0.5%.
7, manufacture method as claimed in claim 5, wherein, Cr be 21% and silicon be 0.45% to 0.5%, and described ferritic stainless steel is at 500 ℃ down after the heating 90 minutes, when utilization met the colourimeter measurement color of ASTMD2244, described ferritic stainless steel was present in a *Value is less than 11 and b *Value is greater than in 11 the zone.
8, manufacture method as claimed in claim 5, wherein, Nb is 0.1% or still less, Si is 0.45% to 0.5%, annealing grains is of a size of No. 7.5, ASTM or higher.
CN2007800486997A 2006-12-28 2007-12-12 Ferritic stainless steel and manufacture method thereof Active CN101573466B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020060137088 2006-12-28
KR10-2006-0137088 2006-12-28
KR1020060137088A KR100821060B1 (en) 2006-12-28 2006-12-28 Ferritic stainless steel with excellent corrosion resistance properties and excellent discoloration resistance properties
PCT/KR2007/006456 WO2008082096A1 (en) 2006-12-28 2007-12-12 Ferritic stainless steel with execellent corrosion resistnace and excellent discoloration resistance

Publications (2)

Publication Number Publication Date
CN101573466A true CN101573466A (en) 2009-11-04
CN101573466B CN101573466B (en) 2012-06-20

Family

ID=39534418

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2007800486997A Active CN101573466B (en) 2006-12-28 2007-12-12 Ferritic stainless steel and manufacture method thereof

Country Status (4)

Country Link
JP (1) JP5372775B2 (en)
KR (1) KR100821060B1 (en)
CN (1) CN101573466B (en)
WO (1) WO2008082096A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103597109A (en) * 2011-06-15 2014-02-19 杰富意钢铁株式会社 Ferritic stainless steel
CN106435103A (en) * 2016-10-13 2017-02-22 江苏金坛绿能新能源科技有限公司 Technological method for improving corrosion resistance of ferritic stainless steel
CN108138278A (en) * 2015-09-30 2018-06-08 杰富意钢铁株式会社 Ferrite series stainless steel plate
CN110312815A (en) * 2017-02-23 2019-10-08 日铁不锈钢株式会社 Black ferrite stainless steel
CN112639152A (en) * 2018-08-28 2021-04-09 株式会社Posco Ferritic stainless steel having excellent pickling characteristics
US11220732B2 (en) 2016-06-27 2022-01-11 Jfe Steel Corporation Ferritic stainless steel sheet

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011214063A (en) * 2010-03-31 2011-10-27 Jfe Steel Corp Ferritic stainless steel sheet and method for manufacturing the same
JP2011214060A (en) * 2010-03-31 2011-10-27 Jfe Steel Corp Ferritic stainless steel sheet and method for manufacturing the same
JP2020164955A (en) * 2019-03-29 2020-10-08 日鉄ステンレス株式会社 Ferritic stainless steel sheet for coating and painted steel sheet
KR20230094072A (en) 2021-12-20 2023-06-27 주식회사 포스코 Ferritic stainless steel with improved resistance to oxidation and discoloration
CN115927950B (en) * 2022-07-29 2024-01-09 江西宝顺昌特种合金制造有限公司 Carbon-nitrogen-containing high-chromium ferrite stainless steel and manufacturing method thereof

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5302214A (en) * 1990-03-24 1994-04-12 Nisshin Steel Co., Ltd. Heat resisting ferritic stainless steel excellent in low temperature toughness, weldability and heat resistance
JP2739531B2 (en) * 1991-09-17 1998-04-15 日新製鋼株式会社 Ferritic stainless steel with excellent weld corrosion resistance
JPH06279951A (en) * 1993-03-26 1994-10-04 Nisshin Steel Co Ltd Ferritic stainless steel for water heater
US6413332B1 (en) * 1999-09-09 2002-07-02 Kawasaki Steel Corporation Method of producing ferritic Cr-containing steel sheet having excellent ductility, formability, and anti-ridging properties
JP3680272B2 (en) * 2001-01-18 2005-08-10 Ｊｆｅスチール株式会社 Ferritic stainless steel sheet and manufacturing method thereof
EP1225242B1 (en) 2001-01-18 2004-04-07 JFE Steel Corporation Ferritic stainless steel sheet with excellent workability and method for making the same
JP3788311B2 (en) * 2001-10-31 2006-06-21 Ｊｆｅスチール株式会社 Ferritic stainless steel sheet and manufacturing method thereof
KR100762151B1 (en) * 2001-10-31 2007-10-01 제이에프이 스틸 가부시키가이샤 Ferritic stainless steel sheet having excellent deep-drawability and brittle resistance to secondary processing and method for making the same
JP3680829B2 (en) * 2001-10-31 2005-08-10 Ｊｆｅスチール株式会社 Ferritic stainless steel sheet excellent in deep drawability, secondary work brittleness resistance and corrosion resistance, and method for producing the same
KR20060075690A (en) * 2004-12-29 2006-07-04 주식회사 포스코 Method for manufacturing cold-rolled ferritic stainless steel having excellent surface brilliant

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103597109A (en) * 2011-06-15 2014-02-19 杰富意钢铁株式会社 Ferritic stainless steel
CN103597109B (en) * 2011-06-15 2015-05-20 杰富意钢铁株式会社 Ferritic stainless steel
CN108138278A (en) * 2015-09-30 2018-06-08 杰富意钢铁株式会社 Ferrite series stainless steel plate
TWI638055B (en) * 2015-09-30 2018-10-11 杰富意鋼鐵股份有限公司 Ferrous iron series stainless steel plate
US11220732B2 (en) 2016-06-27 2022-01-11 Jfe Steel Corporation Ferritic stainless steel sheet
CN106435103A (en) * 2016-10-13 2017-02-22 江苏金坛绿能新能源科技有限公司 Technological method for improving corrosion resistance of ferritic stainless steel
CN110312815A (en) * 2017-02-23 2019-10-08 日铁不锈钢株式会社 Black ferrite stainless steel
CN110312815B (en) * 2017-02-23 2021-05-25 日铁不锈钢株式会社 Black ferrite stainless steel sheet
CN112639152A (en) * 2018-08-28 2021-04-09 株式会社Posco Ferritic stainless steel having excellent pickling characteristics
CN112639152B (en) * 2018-08-28 2022-07-05 株式会社Posco Ferritic stainless steel having excellent pickling characteristics

Also Published As

Publication number Publication date
WO2008082096A1 (en) 2008-07-10
JP5372775B2 (en) 2013-12-18
CN101573466B (en) 2012-06-20
KR100821060B1 (en) 2008-04-08
JP2010514924A (en) 2010-05-06

Similar Documents

Publication Publication Date Title
CN101573466B (en) Ferritic stainless steel and manufacture method thereof
JP5349015B2 (en) Method for producing Ni-saving austenitic stainless hot-rolled steel sheet, slab and hot-rolled steel sheet
TWI546389B (en) Fat iron stainless steel plate
JP6037882B2 (en) Ferritic stainless steel sheet with excellent scale peel resistance and method for producing the same
TWI499465B (en) High-toughness and high-corrosion resistance hot rolled ferritic stainless steel sheet
JP6196453B2 (en) Ferritic stainless steel sheet with excellent scale peel resistance and method for producing the same
JP7217353B2 (en) Seawater corrosion resistant steel and its manufacturing method
JP7339255B2 (en) Ferritic stainless steel with excellent high-temperature oxidation resistance and method for producing the same
JP5272759B2 (en) Thick steel plate manufacturing method
JP6274370B1 (en) Ferritic stainless steel sheet
JP5311942B2 (en) Stainless steel for brazing
JP2012172211A (en) METHOD OF MANUFACTURING LOW Ni AUSTENITIC STAINLESS STEEL SHEET
JP6411881B2 (en) Ferritic stainless steel and manufacturing method thereof
JP5697218B2 (en) Metal mask
KR101940427B1 (en) Ferritic stainless steel sheet
JP2001207244A (en) Cold rolled ferritic stainless steel sheet excellent in ductility, workability and ridging resistance, and its manufacturing method
WO2015133433A1 (en) Ferritic/austenitic two-phase stainless-steel sheet with excellent polishability and process for producing same
JP2007270168A (en) Method for producing chromium-containing ferritic steel sheet
JP2004083972A (en) Ferritic stainless steel cold rolled, annealed material having excellent secondary workability, and production method therefor
JP4742876B2 (en) Heat resistant material with excellent oxidation resistance and brazing
JP2004218066A (en) Steel sheet with composite structure having excellent fatigue property, and production method therefor
JP3923485B2 (en) Manufacturing method of ferritic single-phase stainless steel with excellent deep drawability
JP4675771B2 (en) Ferritic stainless steel wire for glass encapsulation
JP2021123751A (en) Ferritic stainless steel material for roll molding
JP2021195574A (en) Ferritic stainless steel sheet, method for producing ferritic stainless steel sheet, and automobile exhaust system parts

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CP03 Change of name, title or address
CP03 Change of name, title or address

Address after: Seoul, South Kerean

Patentee after: POSCO Holdings Co.,Ltd.

Address before: Gyeongbuk, South Korea

Patentee before: POSCO

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20230522

Address after: Gyeongbuk, South Korea

Patentee after: POSCO Co.,Ltd.

Address before: Seoul, South Kerean

Patentee before: POSCO Holdings Co.,Ltd.