CN105568171A - Method for improving cold stamping performance of 2205 duplex stainless steel cold plate - Google Patents
Method for improving cold stamping performance of 2205 duplex stainless steel cold plate Download PDFInfo
- Publication number
- CN105568171A CN105568171A CN201610004187.1A CN201610004187A CN105568171A CN 105568171 A CN105568171 A CN 105568171A CN 201610004187 A CN201610004187 A CN 201610004187A CN 105568171 A CN105568171 A CN 105568171A
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- China
- Prior art keywords
- cold
- stainless steel
- duplex stainless
- solution treatment
- solid solution
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C21D8/0236—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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
Abstract
The invention relates to a method for improving cold stamping performance of a 2205 duplex stainless steel cold plate. The method comprises the steps of smelting, cold rolling deformation and solid solution treatment. The method is characterized in that during smelting, the content of Ni is controlled to range from 5.50% to 6.50% in mass percent, and the stability of austenite is improved; the thickness matching of raw material finished products is optimized, and 65% or above of cold deformation is achieved in the cold rolling deformation; and during solid solution treatment, the solid solution treatment temperature is between 1,060 DEG C and 1,080 DEG C. By means of the method, the average ductility of the 2205 duplex stainless steel cold plate reaches 28%. The average diameter of austenite grains in a structure is 30 microns, and the average diameter of ferrite grains in the structure is 15 microns. A gamma fiber structure is still not formed in the ferrite phase in steel, and a sheet with the thickness ranging from 0.7 mm to 1.2 mm meets the cold forming requirement of a plate heat exchanger.
Description
Technical field
The present invention relates to a kind of method improving the performance of stainless steel plate, be specifically related to the method for a kind of raising 2205 duplex stainless steel cold drawing cold stampings.
Background technology
2205 duplex stainless steels are owing to having higher Cr, Mo and N content, in room temperature texture, austenite and ratio of ferrite coexist according to about 1:1 simultaneously, therefore there is the outstanding advantages such as high strength (its yield strength is generally the twice of austenitic stainless steel), good resistance to Cl-spot corrosion, anticorrosion stress-resistant and welding property, be used widely in fields such as petrochemical complex, salt manufacturing, water conservancy project, shipbuildings.Compared with common austenitic stainless steel and super austenitic stainless steel, in steel, the content of Ni obviously reduces, and manufacturing cost reduces, and belongs to high-performance, resource-conserving steel grade.In duplex stainless steel series, 2205 proportions are about about 70%.
2205 is that ferrite and austenite structure coexist under solid solution condition, and the more common 304 austenitic stainless steel differences of its plasticity (lower value of 2205 duplex stainless steel cold drawing standard elongation percentage is 25%), its Lankford r value is very low, mean value r
mbe only 0.7, far below the r of super-purity ferrite stainless steel
mvalue (>1.5), cold-forming is more difficult, brings certain difficulty to plate-type heat exchanger punching press.In 2205 cold drawings, ferritic phase has strong alpha fibers texture, is the major cause causing punching press easily to split.
In order to improve 2205 duplex stainless steel cold drawing cold stampings, conventional method is the Cu adding about 1-2% in composition, or control Md30 is in rational scope, utilizes phase change induction plasticity (TRIP) to improve formability.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method for existing raising 2205 duplex stainless steel cold drawing cold stamping, the invention provides the method for a kind of raising 2205 duplex stainless steel cold drawing cold stampings, present method makes the average elongation of 2205 duplex stainless steel cold drawings at 28-32%.
The present invention, according to the research to 2205 duplex stainless steel cold drawing cold-forming mechanism, takes measures from the control of alloying constituent, the aspect such as organizational controls and thermal treatment process respectively.By improving the Ni content of steel grade, improving the stability of austenite structure, reducing in cold deformation process to bring out generating martensitic susceptibility; By controlling cold roling reduction and rolling post growth annealing, thinning microstructure, and alpha fibers texture being rotated to being conducive to shaping orientation, improving cold stamping performance.
The mass percent of 2205 duplex stainless steel cold drawing compositions of the present invention is as follows:
０＜C≤0.030％，０＜Si≤1.00％，０＜Mn≤2.00％，０＜P≤0.030％，
０＜S≤0.020％，Cr：21.00％～23.00％，Ni：5.50％～6.50％，
Mo:2.50% ~ 3.50%, N:0.14% ~ 0.20%, all the other are iron and inevitable impurity.
This method improving 2205 duplex stainless steel cold drawing cold stampings comprises smelting, cold roller and deformed and solution treatment, it is characterized in that:
In smelting, the content of Ni controls in mass percent 5.50% ~ 6.50%, improves stabilization of austenite;
Optimizing materials finished product thickness mates, cold roller and deformed middle cold deformation more than 65%;
Select rational solid solution temperature, solid solution temperature is 1060 DEG C-1080 DEG C.
Use this to improve the method for 2205 duplex stainless steel cold drawing cold stampings, the average elongation of 2205 duplex stainless steel cold drawings reaches 28%, has exceeded the level of common like product 25-26%.In tissue, the mean diameter of austenite and ferrite crystal grain is about respectively 30 μm and 15 μm, gamma fiber texture is not formed yet in ferritic phase in steel, but alpha fibers texture is to being conducive to rotating near shaping (112) [1-10] ~ (223) [1-10] orientation, thickness is the cold-forming requirement that the thin plate of 0.7-1.2mm meets plate-type heat exchanger.
Embodiment
Below in conjunction with the embodiment of embodiment process in detail, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
1, the chemical composition of 2205 cold drawings:
C：0.016％，Si：0.54％，Mn：1.22％，P：0.026％，S：0.001％，
Cr:22.41%, Ni:5.57%, Mo:3.17%, N:0.1603%, all the other are iron.
2,2205 cold drawing plate gauge lattice: 1.2 ╳ 1219 ╳ Cmm
3,2205 cold drawing deflections: raw thickness 4.0mm, cold roller and deformed rate 75%.
4,2205 cold drawing solution heat treatment temperature: 1070 ± 5 DEG C, strip speed 15m/min, water-cooled of coming out of the stove.
The present embodiment is by producing according to above-mentioned technique, and the unit elongation of 2205 duplex stainless steel cold drawings is 28-30%, meets the punching press requirement of plate-type heat exchanger.
Embodiment two
1, the chemical composition of 2205 cold drawings:
C:0.016%, Si:0.43%, Mn:1.11%, P:0.026%, S:0.001%, Cr:22.62%, Ni:5.74%, Mo:3.12%, N:0.1640%, all the other are iron.
2,2205 cold drawing plate gauge lattice: 0.7 ╳ 1219 ╳ Cmm
3, the deflection of 2205 cold drawings: raw thickness 2.5mm, cold roller and deformed rate 72%.
4,2205 cold drawing solution heat treatment temperature: 1070 ± 5 DEG C, strip speed 15m/min, water-cooled of coming out of the stove.
The present embodiment is by producing according to above-mentioned technique, and the unit elongation of 2205 duplex stainless steel cold drawings is 29-32%, meets the punching press requirement of plate-type heat exchanger.
Claims (1)
1. improve a method for 2205 duplex stainless steel cold drawing cold stampings, it comprises smelting, cold roller and deformed and solution treatment, it is characterized in that:
In smelting, the content of Ni controls in mass percent 5.50% ~ 6.50%, improves stabilization of austenite;
Optimizing materials finished product thickness mates, cold roller and deformed middle cold deformation more than 65%;
During solution treatment, solid solution temperature is 1060 DEG C-1080 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610004187.1A CN105568171A (en) | 2016-01-07 | 2016-01-07 | Method for improving cold stamping performance of 2205 duplex stainless steel cold plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610004187.1A CN105568171A (en) | 2016-01-07 | 2016-01-07 | Method for improving cold stamping performance of 2205 duplex stainless steel cold plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105568171A true CN105568171A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610004187.1A Pending CN105568171A (en) | 2016-01-07 | 2016-01-07 | Method for improving cold stamping performance of 2205 duplex stainless steel cold plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106757072A (en) * | 2016-12-06 | 2017-05-31 | 山西太钢不锈钢股份有限公司 | Plate surface treatment method in two phase stainless steel |
| CN110834040A (en) * | 2018-08-16 | 2020-02-25 | 中国石化工程建设有限公司 | Heat treatment method for forming dual-phase steel elbow |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256111A (en) * | 1996-03-19 | 1997-09-30 | Nisshin Steel Co Ltd | High strength dual-phase stainless steel sheet excellent in adhesion of coated film |
| JP2002339042A (en) * | 2001-05-17 | 2002-11-27 | Hitachi Metals Ltd | Duplex stainless steel for shaft having excellent pitting corrosion resistance |
| JP2004360035A (en) * | 2003-06-06 | 2004-12-24 | Sanyo Special Steel Co Ltd | Duplex stainless steel excellent in stress corrosion cracking resistance |
| CN103469051A (en) * | 2013-08-16 | 2013-12-25 | 广东华鳌合金新材料有限公司 | Duplex stainless steel master alloy and preparation method thereof |
| CN103526130A (en) * | 2013-10-23 | 2014-01-22 | 北京科技大学 | Processing method for direct cold rolling of two-phase stainless steel as-cast state billet steel after solid solution treatment |
-
2016
- 2016-01-07 CN CN201610004187.1A patent/CN105568171A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256111A (en) * | 1996-03-19 | 1997-09-30 | Nisshin Steel Co Ltd | High strength dual-phase stainless steel sheet excellent in adhesion of coated film |
| JP2002339042A (en) * | 2001-05-17 | 2002-11-27 | Hitachi Metals Ltd | Duplex stainless steel for shaft having excellent pitting corrosion resistance |
| JP2004360035A (en) * | 2003-06-06 | 2004-12-24 | Sanyo Special Steel Co Ltd | Duplex stainless steel excellent in stress corrosion cracking resistance |
| CN103469051A (en) * | 2013-08-16 | 2013-12-25 | 广东华鳌合金新材料有限公司 | Duplex stainless steel master alloy and preparation method thereof |
| CN103526130A (en) * | 2013-10-23 | 2014-01-22 | 北京科技大学 | Processing method for direct cold rolling of two-phase stainless steel as-cast state billet steel after solid solution treatment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106757072A (en) * | 2016-12-06 | 2017-05-31 | 山西太钢不锈钢股份有限公司 | Plate surface treatment method in two phase stainless steel |
| CN110834040A (en) * | 2018-08-16 | 2020-02-25 | 中国石化工程建设有限公司 | Heat treatment method for forming dual-phase steel elbow |
| CN110834040B (en) * | 2018-08-16 | 2021-11-12 | 中国石化工程建设有限公司 | Heat treatment method for forming dual-phase steel elbow |
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Application publication date: 20160511 |
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