CN114015846A - Process method for reducing yield strength of low-chromium ferrite stainless steel - Google Patents
Process method for reducing yield strength of low-chromium ferrite stainless steel Download PDFInfo
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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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- 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
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- 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
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- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a process method for reducing yield strength of low-chromium ferrite stainless steel, belongs to the technical field of preparation of low-chromium ferrite stainless steel, and solves the technical problems of large rebound quantity of the existing low-chromium ferrite stainless steel, low weld quality of welded pipes and the like. The technical scheme of the invention is as follows: a method of reducing the yield strength of a low chromium ferritic stainless steel comprising the steps of: 1) smelting and continuously forming a blank to obtain a low-chromium ferrite stainless steel continuous casting blank or a casting blank; 2) heating the continuous casting blank or the casting blank, then carrying out hot rolling, and curling and cooling to obtain a hot rolled coil; 3) carrying out bell-type furnace annealing on the hot rolled coil at the temperature of 800-950 ℃, and carrying out air cooling tapping after the heat preservation time is 6-14 hours; 4) and carrying out continuous low-temperature annealing and pickling on the steel body by using continuous annealing and pickling equipment to obtain the low-chromium ferritic stainless steel with low yield strength. The invention has the advantages of reasonable process design, good product forming performance, high welding quality and the like.
Description
Technical Field
The invention belongs to the technical field of preparation of low-chromium ferritic stainless steel, and particularly relates to low-chromium ferritic stainless steel and a method for reducing yield strength of the low-chromium ferritic stainless steel.
Background
The ferritic stainless steel is roughly divided into three types, namely low chromium (the mass percentage of chromium is 11-15%), medium chromium (the mass percentage of chromium is 16-20%) and high chromium (the mass percentage of chromium is 21-30%) due to different chromium contents. The low-chromium ferrite stainless steel saves chromium resources and has low cost, thereby being widely applied to a plurality of fields (automobile industry, house building, petrochemical industry and environmental protection).
The yield strength is the yield limit at which the metal material yields, i.e., the stress against a slight amount of plastic deformation. Intrinsic factors affecting yield strength are: bonding, organization, structure, and atomic nature. From a structural point of view, four strengthening mechanisms affect the yield strength of a metallic material, including: solid solution strengthening, deformation strengthening, precipitation strengthening, dispersion strengthening, and grain boundary and sub-crystal strengthening. External factors affecting yield strength are: temperature, strain rate, and stress state. Yield strength is not only of direct use significance, but also an approximate measure of certain mechanical behaviors and process properties of materials in engineering. The yield strength of the material is increased, and the material is sensitive to stress corrosion and hydrogen embrittlement; the material has low yield strength and good cold-working forming performance and welding performance. However, the low-chromium ferritic stainless steel for general processing has high yield strength, so that the rebound quantity of a stainless steel product is large, and the quality of a welding seam of a welded pipe is low.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problems of large rebound quantity of the existing low-chromium ferritic stainless steel and low quality of the welding line of the welded pipe, the invention provides a process method for reducing the yield strength of the low-chromium ferritic stainless steel.
The invention is realized by the following technical scheme.
A method of reducing the yield strength of a low chromium ferritic stainless steel comprising the steps of:
1) obtaining a low-chromium ferrite stainless steel continuous casting blank or a casting blank through alloy smelting and continuous cooling forming;
2) hot rolling the continuous casting blank or the casting blank prepared in the step 1), wherein the hot rolling deformation is 92-98%, and the continuous casting blank or the casting blank is curled and cooled after hot rolling to obtain a hot rolled coil;
3) feeding the hot rolled coil prepared in the step 2) into a bell-type furnace for annealing at the annealing temperature of 800-950 ℃ for 6-14 hours, and then discharging and air cooling to room temperature;
4) continuous low temperature annealing and pickling
In the continuous annealing and pickling equipment, the front 1/2-2/3 area of the continuous annealing furnace is set as a rolled plate preheating area, and the rear 1/3-1/2 area of the continuous annealing furnace is set as a process temperature control area;
unwinding the hot rolled coil prepared in the step 3), and then sending the unwound hot rolled coil into a plate rolling preheating area, wherein the heating temperature is 200-300 ℃; continuously feeding the preheated rolled plate into a process temperature control area, wherein the heating furnace temperature is 400-700 ℃, and TV = 150-210; and carrying out continuous low-temperature treatment and pickling on the rolled plate by using continuous annealing and pickling equipment to obtain the low-chromium ferritic stainless steel with low yield strength.
Furthermore, in the step 4), the continuous annealing furnace has 18 zones in total, wherein the 1 st to 11 th zones are rolling plate preheating zones, and the 12 th to 18 th zones are process temperature control zones.
Further, the pickling process in the continuous annealing pickling equipment adopts a sulfuric acid + mixed acid process.
Further, the thickness of the steel strip of the hot-rolled coil is 3-12 mm.
Further, the yield strength of the low-chromium ferrite stainless steel prepared in the step 4) at room temperature is 190-230 MPa.
Further, the chemical weight percentage of the low-chromium ferritic stainless steel is as follows: c: less than or equal to 0.03 percent, Cr: 10.5-12.0%, Si: less than or equal to 0.60 percent, Mn: less than or equal to 1.20 percent, less than or equal to 0.04 percent of P, less than or equal to 0.02 percent of S, and the weight ratio of Ti: 0.10-0.30%, N: less than or equal to 0.02 percent, and the balance of Fe and inevitable impurities.
The invention has the following beneficial effects: the invention provides a process method for reducing the yield strength of low-chromium ferritic stainless steel, which utilizes the process of 'bell-type furnace annealing + continuous low-temperature treatment (low-temperature annealing + pickling)', reduces the yield strength of the low-chromium ferritic stainless steel, reduces the phenomenon of springback of a steel plate after being coiled due to overhigh yield strength, improves the performance of the low-chromium ferritic stainless steel and further improves the welding quality.
Compared with the prior art, the invention has the advantages of reasonable process design, good product forming performance, high welding quality and the like.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
In this example 1, the chemical weight percentages of the low-chromium ferritic stainless steel are as follows: c: 0.0062%, Si: 0.46%, Mn: 0.21%, P0.0167%, S0.001%, Cr: 11.15%, Ti: 0.24%, N: 0.0056%, and the balance of Fe and inevitable impurities.
A method of reducing the yield strength of a low chromium ferritic stainless steel comprising the steps of:
1) obtaining a low-chromium ferrite stainless steel continuous casting blank or a casting blank through alloy smelting and continuous cooling forming;
2) hot rolling the continuous casting blank or the casting blank prepared in the step 1), wherein the hot rolling deformation is 92%, the thickness of a steel strip of a hot-rolled coil is 3mm, and the continuous casting blank or the casting blank is curled and cooled after hot rolling to obtain the hot-rolled coil;
3) feeding the hot rolled coil prepared in the step 2) into a bell-type furnace for annealing at 850 ℃ for 10 hours, and then discharging and air-cooling to room temperature;
4) continuous low temperature annealing and pickling
In the continuous annealing and pickling equipment, the continuous annealing furnace has 18 areas, wherein the 1 st to 11 th areas are rolling plate preheating areas, and the 12 th to 18 th areas are process temperature control areas; the acid cleaning process adopts a sulfuric acid and mixed acid process;
unwinding the hot rolled coil prepared in the step 3), and then sending the hot rolled coil into a rolling plate preheating area, wherein the heating temperature is 200 ℃; the preheated rolled plate is continuously sent into a process temperature control area, the heating temperature is 400 ℃, and TV = 150.
The low-chromium ferritic stainless steel obtained by the process has the yield strength (Rp0.2) of 230MPa, the tensile strength of 425MPa, the elongation of 44% and the hardness of 62HRB at room temperature (to 25 ℃).
Example 2
In this example 2, the chemical weight percentages of the low-chromium ferritic stainless steel are as follows: c: 0.0067%, Si: 0.41%, Mn: 0.20%, P0.0168%, S0.001%, Cr: 11.31%, Ti: 0.22%, N: 0.0053%, and the balance of Fe and inevitable impurities.
A method of reducing the yield strength of a low chromium ferritic stainless steel comprising the steps of:
1) obtaining a low-chromium ferrite stainless steel continuous casting blank or a casting blank through alloy smelting and continuous cooling forming;
2) hot rolling the continuous casting blank or the casting blank prepared in the step 1), wherein the hot rolling deformation is 93%, the thickness of a steel strip of a hot-rolled coil is 3mm, and the continuous casting blank or the casting blank is curled and cooled after hot rolling to obtain the hot-rolled coil;
3) feeding the hot rolled coil prepared in the step 2) into a bell-type furnace for annealing at 850 ℃ for 12 hours, and then discharging and air-cooling to room temperature;
4) continuous low temperature annealing and pickling
In the continuous annealing and pickling equipment, the continuous annealing furnace has 18 areas, wherein the 1 st to 11 th areas are rolling plate preheating areas, and the 12 th to 18 th areas are process temperature control areas; the acid cleaning process adopts a sulfuric acid and mixed acid process;
unwinding the hot rolled coil prepared in the step 3), and then sending the hot rolled coil into a rolling plate preheating area, wherein the heating temperature is 250 ℃; the preheated rolled plate is continuously sent into a process temperature control area, the heating temperature is 500 ℃, and TV = 150.
The low-chromium ferritic stainless steel obtained by the process has the yield strength (Rp0.2) of 218MPa, the tensile strength of 411MPa, the elongation of 46% and the hardness of 61.5HRB at room temperature (to 25 ℃).
Example 3
In this example 3, the chemical weight percentages of the low-chromium ferritic stainless steel are as follows: c: 0.0062%, Si: 0.46%, Mn: 0.21%, P0.0167%, S0.001%, Cr: 11.15%, Ti: 0.24%, N: 0.0056%, and the balance of Fe and inevitable impurities.
A method of reducing the yield strength of a low chromium ferritic stainless steel comprising the steps of:
1) obtaining a low-chromium ferrite stainless steel continuous casting blank or a casting blank through alloy smelting and continuous cooling forming;
2) hot rolling the continuous casting blank or the casting blank prepared in the step 1), wherein the hot rolling deformation is 94%, the thickness of a steel strip of a hot-rolled coil is 3mm, and the continuous casting blank or the casting blank is curled and cooled after hot rolling to obtain the hot-rolled coil;
3) feeding the hot rolled coil prepared in the step 2) into a bell-type furnace for annealing at the annealing temperature of 830 ℃ for 10 hours, and then discharging and air-cooling to room temperature; the acid cleaning process adopts a sulfuric acid and mixed acid process;
4) continuous low temperature annealing and pickling
In the continuous annealing and pickling equipment, the continuous annealing furnace has 18 areas, wherein the 1 st to 11 th areas are rolling plate preheating areas, and the 12 th to 18 th areas are process temperature control areas;
unwinding the hot rolled coil prepared in the step 3), and then sending the hot rolled coil into a rolling plate preheating area, wherein the heating temperature is 300 ℃; the preheated rolled plate is continuously sent into a process temperature control area, the heating temperature is 600 ℃, and TV = 150.
The low-chromium ferritic stainless steel obtained by the process has the yield strength (Rp0.2) of 212MPa at room temperature (to 25 ℃), the tensile strength of 415MPa, the elongation of 45 percent and the hardness of 62 HRB.
Example 4
In this example 4, the chemical weight percentages of the low-chromium ferritic stainless steel are as follows: c: 0.0075%, Si: 0.45%, Mn: 0.18%, P0.0219%, S0.001%, Cr: 11.28%, Ti: 0.22%, N: 0.0055%, and the balance of Fe and inevitable impurities.
A method of reducing the yield strength of a low chromium ferritic stainless steel comprising the steps of:
1) obtaining a low-chromium ferrite stainless steel continuous casting blank or a casting blank through alloy smelting and continuous cooling forming;
2) hot rolling the continuous casting blank or the casting blank prepared in the step 1), wherein the hot rolling deformation is 98%, the thickness of a steel strip of a hot-rolled coil is 3mm, and the continuous casting blank or the casting blank is curled and cooled after hot rolling to obtain the hot-rolled coil;
3) feeding the hot rolled coil prepared in the step 2) into a bell-type furnace for annealing at the annealing temperature of 830 ℃ for 12 hours, and then discharging and air-cooling to room temperature;
4) continuous low temperature annealing and pickling
In the continuous annealing and pickling equipment, the continuous annealing furnace has 18 areas, wherein the 1 st to 11 th areas are rolling plate preheating areas, and the 12 th to 18 th areas are process temperature control areas; the acid cleaning process adopts a sulfuric acid and mixed acid process;
unwinding the hot rolled coil prepared in the step 3), and then sending the hot rolled coil into a rolling plate preheating area, wherein the heating temperature is 300 ℃; the preheated rolled plate is continuously sent into a process temperature control area, the heating temperature is 700 ℃, and TV = 150.
The low-chromium ferritic stainless steel obtained by the process has the yield strength (Rp0.2) of 196MPa, the tensile strength of 403MPa, the elongation of 46% and the hardness of 60HRB at room temperature (to 25 ℃).
Comparative example
In this example 4, the chemical weight percentages of the low-chromium ferritic stainless steel are as follows: c: 0.0076%, Si: 0.43%, Mn: 0.17%, P0.0164%, S0.001%, Cr: 11.15%, Ti: 0.24%, N: 0.0053%, and the balance of Fe and inevitable impurities.
1) Smelting and continuously forming a blank to obtain a low-chromium ferrite stainless steel continuous casting blank or a casting blank;
2) heating the continuous casting blank or the casting blank, then carrying out hot rolling, wherein the hot rolling deformation is 95%, curling and cooling to obtain a hot rolled coil, and the thickness of a steel strip of the hot rolled coil is 3 mm;
3) carrying out bell-type furnace annealing on the hot-rolled coil at the temperature of 850 ℃, and carrying out air cooling tapping after the heat preservation time is 10 hours;
4) in the continuous annealing and pickling equipment, the temperature of a continuous annealing furnace is controlled below 100 ℃; the acid washing process adopts a sulfuric acid and mixed acid process.
The low-chromium ferritic stainless steel obtained by the process has the yield strength (Rp0.2) of 267MPa at room temperature (to 25 ℃), the tensile strength of 416MPa, the elongation of 40% and the hardness of 67 HRB.
The chemical compositions and weight percentages of the low chromium ferritic stainless steels in the examples and comparative examples are shown in table 1.
The process conditions in the examples and comparative examples are shown in Table 2 below.
The mechanical properties of the ferritic stainless steel manufactured in each example and comparative example are shown in table 3 below.
As can be seen from table 3, the present invention reduces the yield strength of the low-chromium ferritic stainless steel, reduces the spring back phenomenon after the steel sheet is coiled due to the excessively high yield strength, improves the performance of the low-chromium ferritic stainless steel, and further improves the welding quality.
The embodiments of the present invention have been described in detail with reference to the examples, but the present invention is not limited to the above embodiments, and can be modified within the knowledge of those skilled in the art, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method of reducing the yield strength of a low chromium ferritic stainless steel characterized in that: the method comprises the following steps:
1) obtaining a low-chromium ferrite stainless steel continuous casting blank or a casting blank through alloy smelting and continuous cooling forming;
2) hot rolling the continuous casting blank or the casting blank prepared in the step 1), wherein the hot rolling deformation is 92-98%, and the continuous casting blank or the casting blank is curled and cooled after hot rolling to obtain a hot rolled coil;
3) feeding the hot rolled coil prepared in the step 2) into a bell-type furnace for annealing at the annealing temperature of 800-950 ℃ for 6-14 hours, and then discharging and air cooling to room temperature;
4) continuous low temperature annealing and pickling
In the continuous annealing and pickling equipment, the front 1/2-2/3 area of the continuous annealing furnace is set as a rolled plate preheating area, and the rear 1/3-1/2 area of the continuous annealing furnace is set as a process temperature control area;
unwinding the hot rolled coil prepared in the step 3), and then sending the unwound hot rolled coil into a plate rolling preheating area, wherein the heating temperature is 200-300 ℃; and continuously feeding the preheated rolled plate into a process temperature control area, wherein the heating furnace temperature is 400-700 ℃, and TV = 150-210.
2. A process for reducing the yield strength of low chromium ferritic stainless steels according to claim 1 wherein: in the step 4), the continuous annealing furnace has 18 areas, wherein the 1 st to 11 th areas are rolling plate preheating areas, and the 12 th to 18 th areas are process temperature control areas.
3. A process for reducing the yield strength of low chromium ferritic stainless steels according to claim 1 wherein: the pickling process in the continuous annealing pickling equipment adopts a sulfuric acid + mixed acid process.
4. A process for reducing the yield strength of low chromium ferritic stainless steels according to claim 1 wherein: the thickness of the steel strip of the hot-rolled coil is 3-12 mm.
5. A process for reducing the yield strength of low chromium ferritic stainless steels according to claim 1 wherein: the yield strength of the low-chromium ferrite stainless steel prepared in the step 4) at room temperature is 190-230 MPa.
6. A process for reducing the yield strength of low chromium ferritic stainless steels according to claim 1 wherein: the low-chromium ferritic stainless steel comprises the following chemical weight percentage: c: less than or equal to 0.03 percent, Cr: 10.5-12.0%, Si: less than or equal to 0.60 percent, Mn: less than or equal to 1.20 percent, less than or equal to 0.04 percent of P, less than or equal to 0.02 percent of S, and the weight ratio of Ti: 0.10-0.30%, N: less than or equal to 0.02 percent, and the balance of Fe and inevitable impurities.
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Cited By (2)
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| CN114959466A (en) * | 2022-05-17 | 2022-08-30 | 天津太钢天管不锈钢有限公司 | Low-chromium ferrite stainless steel and manufacturing method thereof |
| CN115386807A (en) * | 2022-09-19 | 2022-11-25 | 山西太钢不锈钢股份有限公司 | Ferrite stainless steel hot-rolled middle plate and preparation method thereof |
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