CN110373604A - A kind of ultrapure middle chrome ferritic stainless steel and its manufacturing method with excellent surface quality - Google Patents
A kind of ultrapure middle chrome ferritic stainless steel and its manufacturing method with excellent surface quality Download PDFInfo
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- CN110373604A CN110373604A CN201810332190.5A CN201810332190A CN110373604A CN 110373604 A CN110373604 A CN 110373604A CN 201810332190 A CN201810332190 A CN 201810332190A CN 110373604 A CN110373604 A CN 110373604A
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- stainless steel
- ultrapure
- ferritic stainless
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- chrome ferritic
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- 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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A kind of ultrapure middle chrome ferritic stainless steel and its manufacturing method with excellent surface quality, the steel chemical composition weight percent are as follows: C:0.005~0.02%, Si:0.4~0.6%, Mn:0.1~0.3%, P≤0.04%, S≤0.005%, Cr:19~21%, N:0.005~0.02%, Cu:0.4~0.6%, Nb:0.4~0.6%, O≤0.005%, Al≤0.005%, must also meet: 0.025% >=C+N >=0.015%, 30 (C+N) >=Nb >=20 (C+N), remaining is Fe and inevitable impurity.The cold rolling processing that carry out aximal deformation value in manufacturing process of the present invention after hot rolling, controls rolled thickness reduction rate >=80%, then in 1000~1050 DEG C of 5~30s of heat preservation.Ultrapure middle chrome ferritic stainless steel provided by the invention has excellent plasticity, intensity and excellent surface quality, can be applied to automobile, building the Surface Qualities requirement such as decorative element field.
Description
Technical field
The present invention relates to a kind of ultrapure middle chrome ferritic stainless steel and its manufacturing method with excellent surface quality.
Technical background
Ferritic stainless steel has vast potential for future development in China.It is analyzed from consumer field, China is a household electrical appliances production
Big country, and household electrical appliances industry is ferritic stainless steel using rich and influential family (such as 430 trades mark), such as roller of washing machine uses ferrite
Stainless steel；With domestic automobile industrial expansion, automobile exhaust system be also using ferritic stainless steel key areas (such as
The 409 equal trades mark)；In terms of, interior/exterior decoration especially roofing using ferritic stainless steel advantageously (such as
The 445 equal trades mark)；In the industrial circles such as petrochemical industry and environmental protection, better corrosion resistance is needed, and super-purity ferrite stainless steel will be at
For the selection (such as 444 trades mark) in this field；China is the manufacture of maximum hardware and export base in the world, ferrite
Stainless steel also has huge use space (such as 443 trades mark) in hardware field.
Ultrapure middle chrome ferritic stainless steel is (Cr weight percent content about are as follows: be 19~21%) steel emerging in recent years
Kind, carbon, nitrogen element content are lower in such steel grade major part ingredient, and stablize containing a certain amount of niobium, titanium, vanadium and aluminium etc.
The element of carbon, nitrogen, some also add a certain amount of nickel and copper.These Design of Chemical Composition are for improving the corrosion-resistant of material
Performance and mechanical property etc..But the addition of the elements such as titanium, aluminium is easy to generate larger harder nonmetallic compound in the material
Grain, when material carries out rolling processing, these particles are easy to fall off from material surface, to influence surface quality.Especially for
There is the defects of surface line squama or peeling often in cold rolling light thin plate, titaniferous or aluminium ferritic stainless steel, while product surface
Brightness, roughness can also decrease.And use environment very high for surface quality requirements, as automobile exterior trimming parts and build
The exterior decoration panel etc. of facility is built, such surface defect is not allow to occur.This just needs iron and steel enterprise to continually develop newly
The product of type.
Summary of the invention
The purpose of the present invention is to provide a kind of ultrapure middle chrome ferritic stainless steel and its system with excellent surface quality
Method is made, tensile strength >=500MPa, yield strength >=330MPa, elongation percentage >=33%, the corrosion resistance E ' of the steelb10≥
0.27V also has high-intensitive, high-ductility and excellent surface quality, is applied under the premise of with preferable corrosion resistance
The more demanding field of Surface Qualities such as decorative element of automobile, building.
In order to achieve the above objectives, the technical scheme is that
A kind of ultrapure middle chrome ferritic stainless steel with excellent surface quality, chemical component weight percentage are as follows: C:
0.005~0.02%, Si:0.4~0.6%, Mn:0.1~0.3%, P≤0.04%, S≤0.005%, Cr:19~21%, N:
0.005~0.02%, Cu:0.4~0.6%, Nb:0.4~0.6%, O≤0.005%, Al≤0.005%, remaining is for Fe and not
Evitable impurity；And above-mentioned constituent content must simultaneously meet following relationship: 0.025% >=C+N >=0.015%, 30 (C+N)
≥Nb≥20(C+N)。
Further, tensile strength >=500MPa of the ultrapure middle chrome ferritic stainless steel, yield strength >=330MPa are prolonged
Stretch rate >=33%, corrosion resistance E 'b10≥0.27V。
In the ingredient design of ferritic stainless steel of the present invention:
Carbon: carbon is the element for increasing alloy strength, but be not easy it is excessive, otherwise can loss material plasticity and corrosion resistance,
Therefore, it is 0.005~0.02% that carbon content is controlled in steel of the present invention.
Silicon: silicon is added as deoxidier, can also improve intensity, but addition can excessively reduce plasticity.Therefore, this hair
It is 0.4~0.6% that silicone content is controlled in bright steel.
Manganese: in view of manganese plays certain advantageous effect to thermoplasticity, but it is excessive when can reduce plasticity and corrosion resistance, because
This, it is 0.1~0.3% that manganese content is controlled in steel of the present invention.
Phosphorus, sulphur: the two elements are harmful therefore lower as far as possible to thermoplasticity and corrosion resistance, should control P≤0.04%, S
≤ 0.005%.
Chromium: chromium is the important element for improving corrosion resistance, and when chromium content is lower than 19%, corrosion resistance is poor, cannot reach
Requirement；But it will increase production difficulty when more than 21%, be also easy to produce hot-rolling sticking defect etc., and then reduce material surface matter
Amount, therefore, in steel of the present invention controlling chromium content is 19~21%.
Nitrogen: nitrogen can increase intensity, to guarantee that material has excellent plasticity and corrosion resistance, it is desirable that Control of Nitrogen Content exists
0.005~0.02%.
Copper: a small amount of copper can be improved the cold working plasticity of material, but it is more when then will increase cost and reduce hot-working
Plasticity, therefore, control the content of copper is 0.4~0.6% in steel of the present invention.
Niobium: being added a certain amount of niobium, plays stable effect, and thinning microstructure to carbon, the nitrogen of material.Due to niobium and carbon,
The affinity of nitrogen is much larger than chromium, and therefore, niobium preferentially forms uniformly tiny NbC or NbN particle in conjunction with carbon, nitrogen, prevents or subtracts
The carbide and nitride of few chromium are formed, to improve the intergranular corrosion resistance performance of material.These tiny NbC or NbN particles
Uniformly tiny equiaxed grain structure can be obtained, and then improve the intensity and plasticity of material with refiner material tissue.These are tiny
NbC or NbN particle while thinning microstructure, it is possible to reduce or eliminate material surface plate line defect generation, to make material
Material surface becomes smooth, fine and smooth, improves surface quality.
Niobium other than corrosion resistance and intensity, plasticity and surface quality can be improved, can also improve material elevated temperature strength and
High-temperature oxidation resistance prevents hot-rolling sticking defect to prevent material from bonding in hot rolling with roller surface
Generation, further increase the surface quality of material.In conjunction with after niobium and carbon, nitrification to the work of material property and surface quality
With by the control of Nb content greater than 20 (C+N) contents.But when content of niobium is excessive, plasticity can be reduced instead, and it is difficult also to will increase production
Degree is also easy to produce material surface crack defect, and the suitable range of Nb content is 0.4~0.6%, and less than 30 (C+N).
C+N: suitably carbon, nitrogen content can guarantee to form the quantity of NbC or NbN particle, improve the corrosion resistance of material
And the performances such as intensity, plasticity and surface quality.But it is not easy excessively, it otherwise can loss material plasticity and corrosion resistance.For dress
Industry is adornd, higher intensity is needed, material can be saved in this way, reduces material cost.For this purpose, the present invention is by (C+N) content control
System is in 0.015~0.025% range.
Especially for ultrapure middle chrome ferritic stainless steel, the present invention control impurity element O≤0.005% in composition of steel,
Al≤0.005% reduces the quantity of large scale in material, field trash with high hardness by controlling these impurity contents,
It avoids material from occurring the defects of surface line squama or peeling during the rolling process, and then improves the surface quality of material.
The manufacturing method of ultrapure middle chrome ferritic stainless steel of the present invention with excellent surface quality comprising as follows
Step:
1) it smelts, cast
It smelted according to mentioned component, be casting continuously to form slab；
2) hot rolling
Heating temperature is 1150~1200 DEG C；
3) annealing+pickling
Hot-roll annealing temperature is 1000~1050 DEG C, 5~30s of soaking time；
4) cold rolling+annealing
Rolled thickness reduction rate >=80%；Annealing after cold rolling temperature is 1000~1050 DEG C, 5~30s of soaking time.
Design and manufacture technology of the invention is after hot rolling to carry out the cold rolling processing of aximal deformation value, specifically comprises the processes of: it is cold
Reduction >=80% is rolled, 5~30s of heat preservation annealing is then carried out at 1000~1050 DEG C.The cold rolling processing technology is available
Uniformly tiny grain structure, and then guarantee that material has good plasticity；Part hot rolled plate surface defect can also be eliminated, it is bright
It is aobvious to improve surface quality.
Beneficial effects of the present invention:
For ultrapure middle chrome ferritic stainless steel, the present invention is by controlling certain carbon, nitrogen content and adding niobium and copper, together
When creatively control C+N:0.015~0.025%, 30 (C+N) >=Nb >=20 (C+N), guaranteeing ultrapure middle chrome ferritic not
Under the premise of the Steel material that becomes rusty has preferable corrosion resistance, the performances such as surface quality and plasticity, the intensity of material are improved；Sternly
Lattice control the impurity contents such as aluminium, oxygen, reduce large scale, the quantity of field trash with high hardness in material, and then improve material
Surface quality；By carrying out the cold rolling processing and Short-time Annealing at High-temperature processing of big deformation quantity to material, it ensure that material grains
It is of uniform size tiny, and then the performances such as ultrapure middle chrome ferritic stainless steel product surface quality and plasticity, intensity are further increased,
Manufacturing process is simple and effective.
Ultrapure middle chrome ferritic stainless steel product produced by the present invention has preferable corrosion resistance, and has excellent
Surface quality and excellent plasticity and intensity, specific performance index are as follows: tensile strength >=500MPa, and yield strength >=
330MPa, elongation percentage >=33%, corrosion resistance E 'b10≥0.27V。
Detailed description of the invention
Fig. 1 is the microscopic metallographic structure photo of 1 steel of the embodiment of the present invention.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
Table 1 is the chemical component of the embodiment of the present invention and comparative example steel, and table 2 is the system of the embodiment of the present invention and comparative example steel
Technological parameter is made, table 3 is the performance of the embodiment of the present invention and comparative example steel.
Embodiment:
It being smelted according to the electric furnace-AOD-VOD of chemical component in table 1, continuous casting steel billet, slab thickness 200mm is hot-rolled down to 5mm,
Annealing, is then cold-rolled to 0.5mm, bright annealing, fabrication process parameters are referring to table 2.Then to cold-rolled products carry out mechanical property,
Corrosion resistance and surface quality detection.
Tensile property detection (testing standard: GB/T228-1987 gold is carried out to embodiment and comparative example stainless steel cold-rolled plate
Belong to stretching test method), it the results are shown in Table 3.
According to stainless steel ferric trichloride pitting corrosion test method (testing standard: GB/T 17897-1999) to of the invention real
It applies a stainless steel cold-rolled plate and carries out corrosion resistance test, testing result is shown in Table 3.
Having carried out surface quality detection to embodiment and comparative example product, (high-grade decoration stainless steel band surface quality is sentenced
Calibration is quasi-: defects count cannot be more than 3 within the scope of the every 200mm of steel strip surface, and flaw size total length cannot be greater than
0.5mm；Steel strip surface totality fraction defective is no more than 5%.), testing result is shown in Table 3.
As shown in Table 3: tensile strength >=500MPa of stainless steel of the present invention, yield strength >=330MPa, elongation percentage >=
33%, there is excellent plasticity and intensity.From embodiment it is found that its high surface quality of Nb content and intensity are preferable, comparative example 1
Middle Nb content is lower than the present invention claims ranges, and cold rolling finished product plate surface hot-rolling sticking defect residual is more, and intensity is relatively low, says
The surface quality and intensity of material are poor when bright Nb content is too low；The Nb content of comparative example 2 is obviously higher by the present invention claims range,
Its plasticity is lower, illustrates that Nb too high levels will affect the plasticity of material.
As shown in Table 3: stainless steel and comparative example steel of the invention and other conventional ultrapure middle chrome ferritic stainless steel (examples
Such as SUS430J1L trade mark) it compares, corrosion resistance is substantially suitable.
As shown in Table 3: the excellent surface quality of stainless-steel cold-rolling panel products of the present invention can reach high-grade decorative sheet
Surface quality requirements.1 product hot-rolling sticking defect of comparative example residual is more, also illustrates the surface matter of material when Nb content is too low
It measures not up to standard.And the product surface of comparative example 3,4 has the appearance of the defects of more different degrees of line squama or peeling, surface quality
It is poor, the surface quality requirements of not up to high-grade decorative sheet, it is seen then that the table of material can be reduced when O, Al constituent content are excessively high
Face quality.
As shown in Figure 1, the tissue of stainless steel of the present invention is uniformly tiny ferrite equi-axed crystal, ensure that material has
There are good intensity and plasticity.
1 unit of table: wt%
Table 2
Table 3
Claims (4)
1. a kind of ultrapure middle chrome ferritic stainless steel with excellent surface quality, chemical component weight percentage are as follows: C:
0.005~0.02%, Si:0.4~0.6%, Mn:0.1~0.3%, P≤0.04%, S≤0.005%, Cr:19~21%, N:
0.005~0.02%, Cu:0.4~0.6%, Nb:0.4~0.6%, O≤0.005%, Al≤0.005%, remaining is for Fe and not
Evitable impurity；And above-mentioned constituent content must simultaneously meet following relationship: 0.025% >=C+N >=0.015%, 30 (C+N)
≥Nb≥20(C+N)。
2. ultrapure middle chrome ferritic stainless steel according to claim 1, which is characterized in that the ultrapure middle chrome ferritic is not
Tensile strength >=500MPa of rust steel, yield strength >=330MPa, elongation percentage >=33%, corrosion resistance E 'b10≥0.27V。
3. a kind of manufacturing method of the ultrapure middle chrome ferritic stainless steel with excellent surface quality comprising following steps:
1) it smelts, cast
Ingredient described in accordance with the claim 1 is smelted, is casting continuously to form slab；
2) hot rolling
Heating temperature is 1150~1200 DEG C；
3) annealing+pickling
Annealing temperature is 1000~1050 DEG C, 5~30s of soaking time；
4) cold rolling+annealing
Rolled thickness reduction rate >=80%；Annealing temperature is 1000~1050 DEG C, 5~30s of soaking time.
4. the manufacturing method of ultrapure middle chrome ferritic stainless steel according to claim 3, which is characterized in that it is described it is ultrapure in
Tensile strength >=500MPa of chrome ferritic stainless steel, yield strength >=330MPa, elongation percentage >=33%, corrosion resistance E 'b10≥
0.27V。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810332190.5A CN110373604A (en) | 2018-04-13 | 2018-04-13 | A kind of ultrapure middle chrome ferritic stainless steel and its manufacturing method with excellent surface quality |
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| CN201810332190.5A CN110373604A (en) | 2018-04-13 | 2018-04-13 | A kind of ultrapure middle chrome ferritic stainless steel and its manufacturing method with excellent surface quality |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094325A (en) * | 2022-07-05 | 2022-09-23 | 鞍钢联众(广州)不锈钢有限公司 | Ultrapure ferrite stainless steel for elevator panel and manufacturing method thereof |
| CN115341147A (en) * | 2022-08-19 | 2022-11-15 | 山西太钢不锈钢股份有限公司 | Medium-chromium ferrite stainless steel for elevator panel and preparation method thereof |
| CN115461485A (en) * | 2020-04-28 | 2022-12-09 | 株式会社Posco | Ferrite-based stainless steel with improved surface characteristics and method for manufacturing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796960A (en) * | 2011-05-25 | 2012-11-28 | 宝山钢铁股份有限公司 | Ferrite stainless steel with good plastic property and surface quality and preparation method thereof |
| CN103966409A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Manufacturing method for medium chrome ferrite stainless steel |
-
2018
- 2018-04-13 CN CN201810332190.5A patent/CN110373604A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796960A (en) * | 2011-05-25 | 2012-11-28 | 宝山钢铁股份有限公司 | Ferrite stainless steel with good plastic property and surface quality and preparation method thereof |
| CN103966409A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Manufacturing method for medium chrome ferrite stainless steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115461485A (en) * | 2020-04-28 | 2022-12-09 | 株式会社Posco | Ferrite-based stainless steel with improved surface characteristics and method for manufacturing the same |
| CN115094325A (en) * | 2022-07-05 | 2022-09-23 | 鞍钢联众(广州)不锈钢有限公司 | Ultrapure ferrite stainless steel for elevator panel and manufacturing method thereof |
| CN115341147A (en) * | 2022-08-19 | 2022-11-15 | 山西太钢不锈钢股份有限公司 | Medium-chromium ferrite stainless steel for elevator panel and preparation method thereof |
| CN115341147B (en) * | 2022-08-19 | 2023-09-26 | 山西太钢不锈钢股份有限公司 | Medium chromium ferrite stainless steel for elevator panel and preparation method thereof |
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