CN106319370B - With excellent plasticity and high-intensitive middle chrome ferritic stainless steel and its manufacturing method - Google Patents
With excellent plasticity and high-intensitive middle chrome ferritic stainless steel and its manufacturing method Download PDFInfo
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Abstract
A kind of middle chrome ferritic stainless steel and its manufacturing method with excellent plasticity and high intensity, steel chemical composition weight percent are as follows: C:0.022~0.04%, Si:0.3~0.5%, Mn:0.1~0.3%, P :≤0.04%, S :≤0.01%, Cr:18.0~22.0%, Cu:0.4~0.7%, Nb:0.4~0.7%, N:0.01~0.04%, remaining is Fe and inevitable impurity, and needs to meet: 0.032%≤C+N≤0.06%, 1.0%≤Nb+Cu≤1.2%.The present invention is in a manufacturing process, the cold rolling processing of aximal deformation value is carried out after hot rolling, control rolled thickness reduction rate >=80%, then 30~60s of heat preservation annealing is carried out at 1000~1020 DEG C, obtains uniformly tiny ferrite equi-axed crystal, and then guarantees that material has good plasticity and intensity, its tensile strength >=510MPa, yield strength >=350MPa, elongation percentage >=35%, spot corrosion current potential E 'b10≥0.21v。
Description
Technical field
The present invention relates to ferritic stainless steels, and in particular to it is a kind of with excellent plasticity and high-intensitive middle chrome ferritic not
The manufacturing method of rust steel cold-reduced sheet.
Background technique
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 middle chrome ferritic 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.
Middle chrome ferritic stainless steel (Cr weight percent content about are as follows: it is 18~22%) steel grade emerging in recent years,
Such steel grade improves the corrosion resistance of material, and the member of the microalloying by the way that Stable Carbon nitrogen is added by reducing carbon nitrogen content
The performances such as the cold working and welding of plain (niobium, titanium, vanadium etc.) Lai Tigao material, after material cold working also can be improved in these microelements
Surface quality, such as can be with corrugated degree after lightening material cold forming.The steel grade has and conventional 304 austenite stainless base steels
The characteristics of this comparable corrosion resistance and cold forming function admirable, and at low cost, can be widely applied to electric appliance, product, automobile,
The industries such as elevator.Day brand-new Gang Deng company, the Japan such steel grade of mass production at present, the trade mark have NSS180, NSS442M,
SUS430J1L etc..Such steel grade is mainly used for instead of low in the poor routine of the higher austenitic stainless steel of price and corrosion resistance
Chrome ferritic stainless steel, in multiple industrial applications, such as: household appliance components, product, inner and outer decorative parts of automobile are also used to exchange heat
Device component etc., market demand is larger.It can be seen that the steel grade is at home and abroad widely applied, market prospects are considerable.But in some household electrical appliances
And the industries such as product, the requirement of cold-forming property and intensity to material are higher and higher, it is desirable to obtain not only having high-ductility but also have
There is high-intensitive material, iron and steel enterprise is thus needed to develop novel stainless steel material.
Carbon, nitrogen control lower in the chemical component of existing middle chrome ferritic stainless steel, and contain niobium, titanium, vanadium and aluminium etc.
The element of Stable Carbon, nitrogen, some also added nickel and copper.Such Design of Chemical Composition is for improving the corrosion-resistant of material
With cold machine-shaping.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 pair
In cold rolling bright plate, there is the defects of surface peeling or striped, the light of product surface often in titaniferous or aluminium ferritic stainless steel
Degree, roughness can also decrease.And the use environment high for some surface quality requirements, such as appliances parts, such table
Planar defect is not allow to occur.
Summary of the invention
The purpose of the present invention is to provide a kind of with excellent plasticity and high-intensitive middle chrome ferritic stainless steel and its system
Make method, the steel have excellent plasticity and high intensity, tensile strength >=510MPa, yield strength >=350MPa, elongation percentage >=
35%, spot corrosion current potential E 'b10>=0.21v can be processed into product of various shapes, be applied to household electrical appliances, product, automobile and other industries.
In order to achieve the above objectives, the technical scheme is that
A kind of middle chrome ferritic stainless steel with excellent plasticity and high intensity, chemical component weight percentage are as follows: C:
0.022~0.04%, Si:0.3~0.5%, Mn:0.1~0.3%, P :≤0.04%, S :≤0.01%, Cr:18.0~
22.0%, Cu:0.4~0.7%, Nb:0.4~0.7%, N:0.01~0.04%, remaining is Fe and inevitable impurity, and
Above-mentioned element need to meet following relationship: 0.032%≤C+N≤0.06%, 1.0%≤Nb+Cu≤1.2% simultaneously.
Further, the microstructure of middle chrome ferritic stainless steel of the present invention is uniformly tiny ferrite equiax crystal
Grain.
Tensile strength >=510MPa of the middle chrome ferritic stainless steel, yield strength >=350MPa, elongation percentage >=35%,
Spot corrosion current potential E 'b10≥0.21v。
In the ingredient design of steel of the present invention:
Carbon (C): being to increase the element of alloy strength, but be not easy excessively, otherwise can loss material plasticity and corrosion resistance.Cause
This, it is 0.022~0.04% that the present invention, which controls carbon content,.
Silicon (Si): being to be added as deoxidier, but addition can excessively reduce plasticity.Therefore, the present invention controls silicone content
It is 0.3~0.5%.
Manganese (Mn): in view of manganese plays certain advantageous effect to thermoplasticity, but it is excessive when can reduce plasticity and corrosion resistance
Can, it should lack as far as possible, therefore it is 0.1~0.3% that the present invention, which controls manganese content,.
Phosphorus (P), sulphur (S): for thermoplasticity and corrosion proof consideration, the two elements are lower as far as possible, should control P≤
0.04%, S≤0.01%.
Chromium (Cr): improving corrosion proof important element, and when being lower than 18%, corrosion resistance is poor, cannot reach requirement, but
Chromium content will increase production difficulty, cost and intermetallic compound and tendency be precipitated when being more than 22%.Therefore, the present invention controls chromium and contains
Amount is 18~22%.
Copper (Cu): a small amount of copper can be improved the cold working plasticity and intensity of material, but it is more when then will increase cost and
Plasticity is reduced, therefore control the content of copper of the present invention is 0.4~0.7%.
Niobium (Nb): being added a certain amount of microelement niobium, plays stable effect to carbon, the nitrogen of material, thinning microstructure can
Plasticity, intensity and corrosion resistance etc. are improved, but excessive niobium is unfavorable instead to material plasticity, and increases material cost.Therefore, originally
Invention control content of niobium is 0.4~0.7%.
Nitrogen (N): intensity can be increased, it is desirable that it is to have excellent plasticity for guarantee material that nitrogen content, which is 0.01~0.04%,
With corrosion proof consideration.
0.032%≤C+N≤0.06%: carbon and nitrogen are the element of increase alloy strength, but are not easy excessively, otherwise to lose
Material plasticity and corrosion resisting property.For household electric appliances, higher intensity is needed, material can be saved, reduce cost.For this purpose, carbon,
The content of nitrogen is unsuitable too low, to guarantee high intensity, but can not be excessively high, it otherwise can reduce plasticity and corrosion resistance, nothing
Method meets the processing performance requirement of household electric appliances.
1.0%≤Nb+Cu≤1.2%: niobium and copper are the elements for improving material plasticity and surface quality, can also be improved strong
Degree.For household electric appliances requirement, higher plasticity and surface quality are needed, the niobium and copper that sufficient amount is added both can be obtained preferably
Plasticity, mouldability and intensity, and can guarantee product surface quality.But when niobium and copper content are more than 1.2%, intensity mistake can be made
Height causes plasticity to decline, and increases material cost.In conjunction with carbon+Control of Nitrogen Content 0.03~0.06%, admittedly in view of carbon,
Niobium+copper control is guaranteed the combined influence of material property by nitrogen, niobium and copper in 1.0~1.2% ranges accordingly
To excellent cold working plasticity and intensity, and it can guarantee good product surface quality, to obtain optimal performance and table
Face mass combination.
Manufacturing method of the present invention with excellent plasticity and high-intensitive middle chrome ferritic stainless steel, including it is as follows
Step:
1) it makes steel, cast
It is made steel by mentioned component using electric furnace-AOD, is casting continuously to form slab.
2) hot rolling
Start rolling temperature is 1150~1200 DEG C, and finishing temperature is 850~950 DEG C.
3) annealing, pickling
Annealing temperature is 980~1000 DEG C, and annealing time is 30~60s, pickling after annealing.
4) cold rolling
Rolled thickness reduction rate >=80%.
5) bright annealing after cold rolling
Bright annealing temperature is 1000~1020 DEG C, and the bright annealing time is 30~60s.
In design and manufacture technology of the invention:
Hot rolling start rolling temperature of the present invention is 1150~1200 DEG C, and finishing temperature is 850~950 DEG C, guarantees sufficiently high heat
Roll plate temperature, it is possible to reduce generation the defects of hot roll trace.
Reduction >=80% is controlled in cold-rolled process, the cold rolling processing of aximal deformation value is to guarantee to store foot in cold-reduced sheet
Enough deformation energy, available good metallographic structure and performance in subsequent annealing processing.
Busbar bright annealing technology is all to obtain steel plate good using annealing between high temperature, short time after hot-roll annealing technique, cold rolling
Good metallographic structure and performance.
The present invention can repeat step 4) and step 5) and hot-roll annealing plate is carried out cold rolling twice and annealing processing.In this way may be used
To obtain preferably uniformly small grains tissue, and then guarantee that material has more excellent plasticity and intensity, table also can be improved
Face quality.
Beneficial effects of the present invention:
The present invention has excellent modeling by controlling carbon, nitrogen content, and adding a certain amount of niobium, copper to guarantee material both
Property, also there is high intensity；It is handled in manufacturing process by the cold rolling processing and Short-time Annealing at High-temperature that carry out big deformation quantity to material,
It obtains uniformly tiny grain structure, further increases the plasticity and intensity of material, and guarantee to obtain good product surface
Quality.
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 and attached drawing, the present invention will be further described.
Stainless steel chemical component of the embodiment of the present invention is shown in Table 1.
Manufacturing method of the present invention is made steel using electric furnace-AOD, is casting continuously to form base, slab thickness 200mm, is hot-rolled down to 4mm thickness, and 980
Then~1000 DEG C of heat preservations annealing+pickling in 30~60 seconds is cold-rolled to 0.5mm thickness, in 1000~1020 DEG C of bright annealings, annealing
Heat preservation 30~60 seconds.
To 1-5 of the embodiment of the present invention and comparative example 1-4 stainless steel cold-rolled plate carried out tensile property detection (testing standard:
GB/T 228-1987 metal tensile test method), it the results are shown in Table 2.
According to stainless steel ferric trichloride pitting corrosion test method (testing standard: GB/T 17897-1999) to the present invention not
The steel cold-reduced sheet that becomes rusty carries out corrosion resistance test, and testing result is shown in Table 2.
As known from Table 2: the elongation percentage of steel of the present invention is 35% or more, and for yield strength in 350MPa or more, tension is strong
Degree in 510MPa or more, has excellent plasticity and high intensity.From table 1, table 2 it is found that with C+N and Nb+Cu content increasing
Add, the plasticity of material gradually decreases, and intensity gradually increases.For the C+N content of comparative example 1 lower than the present invention, intensive properties are lower, say
Bright: the intensity of material is poor when C+N < 0.03%；The C+N content of comparative example 2 is greater than the present invention, and plasticity is lower, illustrates: C+N
The plasticity of material is poor when > 0.06%；For the Nb+Cu content of comparative example 3 lower than the present invention, intensity is lower, illustrates: Nb+Cu <
The intensity of material is poor when 1.0%；The Nb+Cu content of comparative example 4 is greater than the present invention, and plasticity is lower, illustrates: Nb+Cu >
The plasticity of material is poor when 1.2%.
As shown in Table 2, for steel of the present invention compared with conventional middle chrome ferritic stainless steel, corrosion resistance is substantially suitable.It is real
The Nb content for applying example 3 is higher, and corrosion resisting property is preferable.When Cr content in embodiment 5 is higher, corrosion resisting property is significantly improved.
The C+N content of comparative example 1 is lower, and corrosion resistance is preferable；And the C+N content of comparative example 2 is higher, corrosion resistance compared with
It is low.As it can be seen that the corrosion resistance of material is substantially reduced when C+N > 0.06%.
Referring to Fig. 1, the grain structure of steel of the present invention is uniformly tiny ferrite equi-axed crystal, ensure that material has
Good plasticity and intensity.
Claims (2)
1. a kind of middle chrome ferritic stainless steel with excellent plasticity and high intensity, chemical component weight percentage are as follows: C:
0.022~0.04%, Si:0.3~0.5%, Mn:0.1~0.3%, P :≤0.04%, S :≤0.01%, Cr:18.0~
22.0%, Cu:0.4~0.7%, Nb:0.4~0.7%, N:0.01~0.04%, remaining is Fe and inevitable impurity, and
Above-mentioned element need to meet following relationship: 0.032%≤C+N≤0.06%, 1.0%≤Nb+Cu≤1.2% simultaneously；The middle chromium
The microstructure of ferritic stainless steel is uniformly tiny ferrite equi-axed crystal；The tension of the middle chrome ferritic stainless steel is strong
Degree >=510MPa, yield strength >=350MPa, elongation percentage >=35%, spot corrosion current potential E 'b10≥0.21v。
2. the manufacturing method with excellent plasticity and high-intensitive middle chrome ferritic stainless steel as described in claim 1, feature
It is, includes the following steps:
1) it makes steel, cast
It is made steel by ingredient described in claim 1 using electric furnace-AOD, is casting continuously to form slab；
2) hot rolling
Hot rolling start rolling temperature is 1150~1200 DEG C, and hot rolling finishing temperature is 850~950 DEG C；
3) annealing, pickling
Annealing temperature is 980~1000 DEG C, and annealing time is 30~60s, pickling after annealing；
4) cold rolling
Rolled thickness reduction rate >=80%；
5) bright annealing after cold rolling
Bright annealing temperature is 1000~1020 DEG C, and the bright annealing time is 30~60s.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107042235B (en) * | 2017-06-02 | 2018-07-27 | 江苏甬金金属科技有限公司 | The production method of very thin ferritic stainless steel band with glossy surface |
| CN110684926A (en) * | 2019-10-21 | 2020-01-14 | 宁波宝新不锈钢有限公司 | Ferritic stainless steel and preparation method thereof |
| CN115725897A (en) * | 2021-08-26 | 2023-03-03 | 生生国际（香港）有限公司 | Cold-rolled stainless steel material and container made of same |
| CN114000061A (en) * | 2021-10-29 | 2022-02-01 | 宝钢德盛不锈钢有限公司 | Low-chromium ferrite stainless steel with excellent plasticity |
| CN116463559B (en) * | 2023-03-21 | 2024-03-22 | 江苏铭铸新材料科技有限公司 | High-rigidity cold-rolled stainless steel sheet for building templates and preparation method thereof |
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| CN101845595A (en) * | 2009-03-26 | 2010-09-29 | 宝山钢铁股份有限公司 | Ferritic stainless steel with good wrinkle resistance and production method thereof |
| 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 |
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Patent Citations (5)
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| JP2002020845A (en) * | 2000-07-07 | 2002-01-23 | Sumitomo Metal Ind Ltd | Heat resistant ferritic stainless steel and automobile exhaust manifold using the same |
| CN101381842A (en) * | 2007-09-07 | 2009-03-11 | 宝山钢铁股份有限公司 | High chromium content ferrite stainless steel and manufacturing method thereof |
| CN101845595A (en) * | 2009-03-26 | 2010-09-29 | 宝山钢铁股份有限公司 | Ferritic stainless steel with good wrinkle resistance and production method thereof |
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Effective date of registration: 20190813 Address after: The Hong Kong Industrial Zone in Luoyuan Bay Development Zone of Luoyuan County of Fuzhou City, Fujian province 350600 Patentee after: Baosteel Desheng Stainless Steel Co., Ltd. Address before: 735 Baoshan District Changjiang Road, Shanghai, No. 200431 Patentee before: Baosteel Stainless Steel Co.,Ltd. |
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