CN114959195B - Stainless steel hood type annealing method - Google Patents
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- CN114959195B CN114959195B CN202210495361.2A CN202210495361A CN114959195B CN 114959195 B CN114959195 B CN 114959195B CN 202210495361 A CN202210495361 A CN 202210495361A CN 114959195 B CN114959195 B CN 114959195B
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 73
- 238000000137 annealing Methods 0.000 title claims abstract description 62
- 239000010935 stainless steel Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 10
- 239000001257 hydrogen Substances 0.000 claims abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 description 7
- 238000005097 cold rolling Methods 0.000 description 6
- 238000005098 hot rolling Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 229910001710 laterite Inorganic materials 0.000 description 2
- 239000011504 laterite Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002431 hydrogen Chemical group 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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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
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- 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
-
- 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
- C21D2211/004—Dispersions; Precipitations
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides a stainless steel hood-type annealing method. The stainless steel hood-type annealing method comprises the following steps: heating the ferrite stainless steel hot rolled coil to 640-660 ℃ at a speed of 5 ℃/min by adopting a full hydrogen hood-type annealing furnace, and preserving heat for 2-3 hours; then, continuously heating the ferrite stainless steel hot rolled coil to 720-740 ℃ at the speed of 10 ℃/min, and preserving heat for 20-24 hours; then, the mixture is cooled for more than 4 hours by a heating cover, then cooled to 180-250 ℃ by a cooling cover, and cooled for more than 10 hours by a final cooling table.
Description
Technical Field
The invention relates to the field of stainless steel annealing, in particular to a stainless steel cover type annealing method.
Background
Currently, austenitic stainless steels are common in the market, such as 304 stainless steel, which has a high Ni content. In addition to this, there are ferritic stainless steels. The ferrite stainless steel is a resource-saving and environment-friendly stainless steel, has wide application prospect in the fields of automobiles, railway transportation, household appliances and the like due to excellent resource saving and comprehensive performance, and is a stainless steel advocated to be developed by the China stainless steel industry.
Ferritic stainless steels are generally free of Ni and have almost zero Ni content. In stainless steel, ni is an austenite forming element, and the existence of Ni enables the (gamma+alpha)/alpha phase boundary in a Fe-Cr binary phase diagram to move towards the direction of higher Cr content, so that the gamma phase region is enlarged, the performance of the stainless steel is changed, and the hardness and the strength of the stainless steel are higher than those of common ferrite stainless steel.
In ferritic stainless steel, due to the existence of carbon and nitrogen elements, gamma phase exists at high temperature, phase transformation occurs in the heating and cooling processes, and annealing treatment is needed after hot rolling. The purpose of the annealing is to fully recrystallize the stainless steel hot rolled coil and decompose the martensite phase formed by transformation at high temperature into ferrite + carbide to give the hot rolled coil cold rolled characteristics; the prior art is limited to annealing of ferritic stainless steel containing no Ni or a small Ni content (0.1%) and annealing of other ferritic stainless steel containing Ni exceeding 0.1%, and the prior art is not concerned with it being difficult to produce ferritic stainless steel containing Ni exceeding 0.1% suitable for subsequent processing or cold rolling.
In summary, the following problems exist in the prior art: annealing of ferritic stainless steel with Ni content exceeding 0.1% is not related to the prior art.
Disclosure of Invention
The invention provides a cover annealing method of ferrite stainless steel and a ferrite stainless steel coil obtained by the method, in particular to a cover annealing method of 410 ferrite stainless steel and a 410 ferrite stainless steel coil obtained by the method, which are used for solving the problem that the prior art does not have a blank of annealing ferrite stainless steel with Ni content exceeding 0.1% and obtaining ideal ferrite stainless steel or is used for solving the problem that the prior art is difficult to produce ferrite stainless steel with Ni content exceeding 0.1% which is suitable for subsequent processing or cold rolling.
To this end, the invention proposes a stainless steel hood-type annealing method comprising:
the components of the stainless steel hot rolled coil are as follows: carbon: 0.04 to 0.065 percent, silicon: 0.35 to 0.60 percent of manganese: 0.25 to 0.45 percent of chromium: 12.00% -12.50%, nickel: 0.30 to 0.60 percent of nitrogen: 0.015 to 0.045 percent, and the balance of Fe and unavoidable impurities;
heating the 410 ferrite stainless steel hot rolled coil to 640-660 ℃ at a speed of 5 ℃/min by adopting a full hydrogen hood-type annealing furnace, and preserving heat for 2-3 hours;
then, continuously heating the ferrite stainless steel hot rolled coil to 720-740 ℃ at the speed of 10 ℃/min, and preserving heat for 20-24 hours;
then, the mixture is cooled for more than 4 hours by a heating cover, then cooled to 180-250 ℃ by a cooling cover, and cooled for more than 10 hours by a final cooling table.
Further, the first stage annealing temperature is 640 ℃, the first stage heat preservation time is 2 hours, the second stage annealing temperature is 740 ℃, the second stage heat preservation time is 24 hours, and the cooling end point temperature is 180 ℃.
Further, the annealing temperature of the first stage is 660 ℃, the heat preservation time of the first stage is 2h, the annealing temperature of the second stage is 720 ℃, the heat preservation time of the second stage is 24h, and the cooling end point temperature is 200 ℃.
Further, the annealing temperature of the first stage is 650 ℃, the heat preservation time of the first stage is 2h, the annealing temperature of the second stage is 730 ℃, the heat preservation time of the second stage is 24h, and the cooling end point temperature is 180 ℃.
Further, the finished ferritic stainless steel 410 has a thickness of 2-3.8mm.
Further, the annealing method adopts a hot coil annealing furnace, which is a full hydrogen hood-type annealing furnace, and comprises the following steps: a furnace table, a heating cover, an inner cover and a cooling cover.
Further, the combustion medium adopted in the annealing is coke oven gas.
Further, the gas burner is arranged on the outer cover in an upper layer and a lower layer, twelve layers are arranged in total, the heat of gas combustion is transferred to the inner cover through radiation, and then the heat is transferred to the annealed steel coil through the heat radiation of the inner cover and the circulating convection heat transfer of the protective gas.
Further, the protective gas in the hot coil annealing furnace is hydrogen.
The invention also provides a 410 ferrite stainless steel coil which is manufactured by the stainless steel cover annealing method, wherein the stainless steel hot rolled coil comprises the following components: carbon: 0.04 to 0.065 percent, silicon: 0.35 to 0.60 percent of manganese: 0.25 to 0.45 percent of chromium: 12.00% -12.50%, nickel: 0.30 to 0.60 percent of nitrogen: 0.015 to 0.045 percent, and the balance of Fe and unavoidable impurities.
Further, the finished ferritic stainless steel 410 has a thickness of 2-3.8mm.
Further: the 410 ferrite stainless steel comprises the following chemical components in percentage by weight: 0.062wt%, si:0.56wt%, mn:0.42wt%, P:0.033wt%, S:0.005wt%, N:0.044wt%, cu:0.03wt%, cr:12.37wt%, ni:0.56wt%.
Further: the 410 ferrite stainless steel comprises the following chemical components in percentage by weight: 0.047wt%, si:0.49wt%, mn:0.35wt%, P:0.033wt%, S:0.006wt%, N:0.023wt%, cu:0.03wt%, cr:12.34wt%, ni:0.50wt%.
The annealing technology provided by the invention enables 410 ferrite stainless steel hot rolled coil (for example, produced by laterite nickel ore) to form a carbide tissue structure with ferrite, a very small amount of martensite and uniform dispersion distribution, wherein the ferrite content is more than or equal to 95%. The invention can reduce the hardness of the annealed hot rolled coil, obtain good yield strength, tensile strength and elongation, and completely meet the processing requirements of the cold rolling process.
Drawings
FIG. 1 is a photograph showing a metallographic structure of example 1 of the present invention;
FIG. 2 is a photograph showing a metallographic structure of example 2 of the present invention;
FIG. 3 is a photograph showing a metallographic structure of example 3 of the present invention.
Detailed Description
The present invention will now be described for a clearer understanding of technical features, objects, and effects of the present invention.
The invention aims at providing a ferrite stainless steel hot-rolled coil bell-type furnace annealing method for 410 ferrite stainless steel hot-rolled coils produced by laterite nickel ore. Through optimization of the bell-type furnace annealing process, the ferrite stainless steel hot rolled coil has lower hardness value and excellent cold rolling processability.
The invention controls the process control point and technical parameters:
1) The components of the stainless steel hot rolled coil are as follows: carbon: 0.03 to 0.07 percent of silicon: 0.40 to 0.60 percent of manganese: 0.25 to 0.55 percent of chromium: 12.00% -12.40%, nickel: 0.40 to 0.60 percent of nitrogen: 0.020 to 0.050 percent, and the balance of Fe and unavoidable impurities.
2) And heating the 410 ferrite stainless steel hot rolled coil to 640-660 ℃ at a speed of 5 ℃/min by adopting a full hydrogen hood-type annealing furnace, and preserving heat for 2-3 hours. At this stage, no recrystallization has occurred, and in the recovery stage, energy storage is provided for subsequent ferrite stainless steel recrystallization.
3) Continuously heating the ferrite stainless steel hot rolled coil to 720-740 ℃ at the speed of 10 ℃/min, and preserving heat for 20-24 hours. The recrystallization behavior at this stage has occurred, long-time heat preservation is favorable for uniform and stable steel coil structure performance, and when the temperature is higher than 750 ℃, the dissolution of carbide can occur, and the carbide can be aggregated and separated out on the grain boundary in the cooling process, which is unfavorable for the corrosion resistance of the ferrite stainless steel.
4) Cooling for more than 4 hours with a heating cover, then cooling to 180-250 ℃ with a cooling cover, and cooling for more than 10 hours at a final cooling stage.
The hot coil annealing furnace adopted by the invention is an all-hydrogen hood-type annealing furnace, which consists of a furnace table, a heating hood, an inner hood and a cooling hood. The combustion medium of the annealing furnace is coke oven gas, the gas burner is arranged on the outer cover in an upper layer and a lower layer, twelve layers are arranged, the heat of gas combustion is transferred to the inner cover through radiation, and then the heat is transferred to the annealed steel coil through the heat radiation of the inner cover and the circulating convection heat transfer of the protective gas. The protection gas in the furnace is hydrogen, convection is formed in the inner cover by the furnace table atmosphere circulating fan, heat of the inner cover is taken away, the steel coil is conveyed to be heated, after heating is finished, the steel coil is cooled for more than 4 hours by the heating cover, after cooling to a preset temperature, the outer cover is removed, the cooling cover is buckled, cold air is sucked from the bottom of the cover and is discharged from the top of the cover, the temperature of the inner cover is reduced, the cooling cover is cooled to 180-250 ℃, the cooling cover is removed, the inner cover is removed, and the steel coil is lifted to be cooled by the final cooling table.
The production method of the ferrite stainless steel adopts the following components and specific processes. Wherein, table 1 is the composition (in weight percent) of each example. Table 2 shows annealing process parameters corresponding to each example of table 1, and the present invention is an annealing process after hot rolling, excluding a cold rolling process, and the above process parameters do not include cold rolling. Table 3 shows mechanical properties after hot rolling annealing according to each example of Table 1. The yield strength ReL of the ferrite stainless steel obtained by the invention: 340-390MPa, tensile strength Rm:510-560MPa, elongation A:25% -38%, rockwell hardness HRB:65-78. FIG. 1 is a metallographic structure of example 1, which is: ferrite, a very small amount of martensite and carbide which are uniformly dispersed, wherein the ferrite content is more than or equal to 99%, the grain size is grade 9.5, and fig. 2 is a metallographic structure of example 2, and the metallographic structure is as follows: ferrite, a very small amount of martensite and carbide which are uniformly dispersed, wherein the ferrite content is more than or equal to 99%, the grain size is 9.0 grade, and fig. 3 is a metallographic structure of example 3, and the metallographic structure is as follows: ferrite, a very small amount of martensite and carbide which are uniformly dispersed, wherein the ferrite content is more than or equal to 99 percent, and the grain size is 9.0 grade.
TABLE 1 content of elements in ferritic stainless steel (%)
| Examples | C | Si | Mn | P | S | Ni | Cr | Cu | N |
| Example 1 | 0.062 | 0.56 | 0.42 | 0.033 | 0.005 | 0.56 | 12.37 | 0.03 | 0.044 |
| Example 2 | 0.055 | 0.39 | 0.31 | 0.033 | 0.005 | 0.54 | 12.20 | 0.03 | 0.032 |
| Example 3 | 0.047 | 0.49 | 0.35 | 0.033 | 0.006 | 0.50 | 12.34 | 0.03 | 0.023 |
TABLE 2 annealing parameters for examples 1-3
Table 3: mechanical Properties of ferritic stainless Steel obtained in examples
| Examples | R p0.2 /MPa | R m /MPa | A/％ | Rockwell hardness HRB |
| Example 1 | 345 | 518 | 36.0 | 70.0 |
| Example 2 | 347 | 554 | 25.6 | 74.0 |
| Example 3 | 374 | 552 | 29.2 | 74.0 |
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. In order that the components of the invention may be combined without conflict, any person skilled in the art shall make equivalent changes and modifications without departing from the spirit and principles of the invention.
Claims (9)
1. A stainless steel cap annealing method, wherein the stainless steel is 410 ferrite stainless steel, the stainless steel cap annealing method comprising:
the components of the stainless steel hot rolled coil are as follows: carbon: 0.04 to 0.065 percent, silicon: 0.35 to 0.60 percent of manganese: 0.25 to 0.45 percent of chromium: 12.00% -12.50%, nickel: 0.30 to 0.60 percent of nitrogen: 0.015 to 0.045 percent, and the balance of Fe and unavoidable impurities;
heating the 410 ferrite stainless steel hot rolled coil to 640-660 ℃ at a speed of 5 ℃/min by adopting a full hydrogen hood-type annealing furnace, and preserving heat for 2-3 hours;
then, continuously heating the ferrite stainless steel hot rolled coil to 720-740 ℃ at the speed of 10 ℃/min, and preserving heat for 20-24 hours;
then, cooling for more than 4 hours with a heating cover, then cooling to 180-250 ℃ with a cooling cover, and cooling for more than 10 hours at a final cooling table;
the yield strength ReL of the obtained ferritic stainless steel: 340-390MPa, tensile strength Rm:510-560MPa, elongation A:25% -38%, rockwell hardness HRB:65-78;
the metallographic structure is as follows: ferrite, a very small amount of martensite and carbide which are uniformly dispersed, wherein the ferrite content is more than or equal to 99 percent, and the grain size grade is 9.5 grade or 9.0 grade.
2. The stainless steel hood-type annealing method according to claim 1, wherein the first stage annealing temperature is 640 ℃, the first stage heat-preserving time is 2h, the second stage annealing temperature is 740 ℃, the second stage heat-preserving time is 24h, and the cooling end point temperature is 180 ℃.
3. The stainless steel hood-type annealing method according to claim 1, wherein the first stage annealing temperature is 660 ℃, the first stage heat-preserving time is 2h, the second stage annealing temperature is 720 ℃, the second stage heat-preserving time is 24h, and the cooling end point temperature is 200 ℃.
4. The stainless steel hood-type annealing method according to claim 1, wherein the first stage annealing temperature is 650 ℃, the first stage heat-preserving time is 2h, the second stage annealing temperature is 730 ℃, the second stage heat-preserving time is 24h, and the cooling end point temperature is 180 ℃.
5. The stainless steel hood-type annealing method according to claim 1, wherein the thickness of the finished ferritic stainless steel 410 is 2-3.8mm.
6. The stainless steel hood-type annealing method according to claim 1, wherein the annealing method employs a hot coil annealing furnace, which is an all-hydrogen hood-type annealing furnace, comprising: a furnace table, a heating cover, an inner cover and a cooling cover.
7. The stainless steel hood-type annealing method according to claim 1, wherein the combustion medium used for the annealing is coke oven gas.
8. The stainless steel hood-type annealing method according to claim 6, wherein the gas burner is installed on the outer hood in upper and lower layers, twelve in total, the heat of gas combustion is transferred to the inner hood by radiation, and then the heat is transferred to the annealed steel coil by heat radiation of the inner hood and circulating convection heat transfer of the shielding gas.
9. The stainless steel hood-type annealing method according to claim 6, wherein the shielding gas in the hot coil annealing furnace is hydrogen.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990040403A (en) * | 1997-11-18 | 1999-06-05 | 이구택 | Phase Annealing Method for 430 Stainless Steel Hot Rolled Coil |
| CN102125931A (en) * | 2010-01-12 | 2011-07-20 | 宝山钢铁股份有限公司 | Hot rolling production method for 400 series stainless steel coils |
| CN113832403A (en) * | 2021-09-25 | 2021-12-24 | 新疆八一钢铁股份有限公司 | Cover annealing method for low-carbon door plate steel |
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| KR19990040403A (en) * | 1997-11-18 | 1999-06-05 | 이구택 | Phase Annealing Method for 430 Stainless Steel Hot Rolled Coil |
| CN102125931A (en) * | 2010-01-12 | 2011-07-20 | 宝山钢铁股份有限公司 | Hot rolling production method for 400 series stainless steel coils |
| CN113832403A (en) * | 2021-09-25 | 2021-12-24 | 新疆八一钢铁股份有限公司 | Cover annealing method for low-carbon door plate steel |
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