CN110331261A - Think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method - Google Patents
Think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method Download PDFInfo
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- CN110331261A CN110331261A CN201910770551.9A CN201910770551A CN110331261A CN 110331261 A CN110331261 A CN 110331261A CN 201910770551 A CN201910770551 A CN 201910770551A CN 110331261 A CN110331261 A CN 110331261A
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- stainless steel
- ferritic stainless
- low chrome
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- rolled coil
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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
- 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
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
-
- 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
- C22C38/004—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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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)
- 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 belongs to ferritic stainless steel technical fields, a kind of particularly think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, the following steps are included: (1) uses hot rolling curtain bell furnace that low chrome ferritic stainless steel hot rolled coil is warming up to 750-800 DEG C with the speed of 30-60 DEG C/h, and keep the temperature 2-5 hours；(2) continue the low chrome ferritic stainless steel hot rolled coil to be warming up to 830-880 DEG C, and keep the temperature 10-16 hours；(3) the hot rolled coil band insulation cover slow cooling is come out of the stove to 500 DEG C of -600 DEG C of rapid cooling, finally obtains low chrome ferritic stainless steel product.The present invention is by the optimization to cover annealing technology, so that think gauge low chrome ferritic stainless steel hot rolled coil has lower hardness number and excellent intensity.
Description
Technical field
The invention belongs to ferritic stainless steel technical fields, and particularly a kind of think gauge low chrome ferritic stainless steel is warm
Roller shutter cover annealing method.
Background technique
Low chrome ferritic stainless steel chromium containing noble metal due to nickel without precious metal or less, not compared with nickeliferous austenite
Become rusty steel, dual phase steel and containing for high chromium content ferrite stainless steel etc., and manufacture cost of material is low, certain along with itself having
Corrosion resistance and workability, therefore the industry such as auto industry, container, heat exchanger are widely applied in low chrome ferritic stainless steel
Manufacture in.For example, when selecting flange think gauge stainless steel, the alternatively material of low chrome ferritic stainless steel plate it
One.However, think gauge low chrome ferritic stainless steel plate must also under the premise of meeting corrosion proof to be suitable for flange steel
Must there are good mechanical property, especially excellent hardness number.Although current existing low chrome ferritic stainless steel production technology,
It has been able to ensure for typical impurity element C, N, 0 etc. to be maintained in lower range, in addition, can be also added according to different demands
Ti or Al etc. refines crystal grain element, and Lai Tigao thickness is less than the performance and processability of 6mm low chrome ferritic stainless steel itself；?
It can be annealed by on-line continuous and obtain good performance, but 6mm ferritic stainless steel is greater than due to welding procedure for thickness
Problem and cannot achieve, thus limit application of the think gauge low chrome ferritic stainless steel as structural member.Therefore, it is directed to thickness
Degree is greater than 6mm ferritic stainless steel and needs that it is made to have excellent physical property by cover annealing technology.
Summary of the invention
The purpose of the present invention is in view of the drawbacks of the prior art, provide a kind of think gauge low chrome ferritic stainless steel hot rolling
Curtain cover annealing method.Wherein, the present invention is by the optimization to cover annealing technology, so that think gauge low chrome ferritic is not
Rust steel hot rolled coil has lower hardness number and excellent intensity.
Specifically, think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method of the invention, including following step
It is rapid:
(1) hot rolling curtain bell furnace is used to be warming up to low chrome ferritic stainless steel hot rolled coil with the speed of 30-60 DEG C/h
750-800 DEG C, and keep the temperature 2-5 hours；
(2) continue the low chrome ferritic stainless steel hot rolled coil to be warming up to 830-880 DEG C, and keep the temperature 10-16 hours；
(3) the hot rolled coil band insulation cover slow cooling is come out of the stove to 500 DEG C of -600 DEG C of rapid cooling, finally obtains low chrome ferritic not
Become rusty steel product.
Above-mentioned think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, the rate of temperature fall of the slow cooling are
10-30℃/h。
Above-mentioned think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, heating described in step (2)
Heating rate is 30-60 DEG C/h.
Above-mentioned think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, the hot rolling curtain bell furnace is complete
Hydrogen bell-type furnace.
Above-mentioned think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, the low chrome ferritic stainless steel
Steel band with a thickness of 6-12mm in hot rolled coil.
Above-mentioned think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, is calculated in mass percent, described
Low chrome ferritic stainless steel includes: C 0-0.03%, N 0-0.03%, Si≤1.0%, Mn≤1.0%, Cr 10.5%-
12.5%, Ti 0.10%-0.30%, remaining is Fe and inevitable impurity.
Above-mentioned think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, the low chrome ferritic stainless steel
The yield strength (Rp0.2) of product at room temperature be 200-280MPa, tensile strength (Rm) be 360-440MPa, hardness (HV)≤
135。
The present invention also provides a kind of low chrome ferritic stainless steels, by above-mentioned think gauge low chrome ferritic stainless steel heat
The processing of roller shutter cover annealing method obtains.
Above-mentioned low chrome ferritic stainless steel, is calculated in mass percent, and the low chrome ferritic stainless steel includes: C 0-
0.03%, N 0-0.03%, Si≤1.0%, Mn≤1.0%, Cr 10.5%-12.5%, Ti 0.10%-0.30%, remaining
For Fe and inevitable impurity.
Technical solution of the present invention have it is following the utility model has the advantages that
(1) requirement for automobile flange stainless steel etc. to ferritic stainless steel hardness and strength, the present invention
By optimizing cover annealing technology, the uniformity of think gauge hot rolled coil physical property, this hair are realized using double annealing technology
The yield strength (Rp0.2) of bright think gauge low chrome ferritic stainless steel is 200-280MPa, and tensile strength (Rm) is 360-
440MPa, hardness (HV)≤135；
(2) present invention is solved by cover annealing technical optimization since think gauge ferritic stainless steel is continuously moving back
Since matrix grain is coarse, plasticity decline, brittleness increases fiery production process, is easy cracking in bending force process, and occur disconnected
Process difficulties with risk realize the continuous acid-washing production of hot rolled coil；
(3) punching press flange can be manufactured raw material and be improved to hot rolling NO.1 roll bending by cut roll plate by the present invention, realize flange punching
The continuous production of pressure improves production efficiency and reduces productive manpower cost for subsequent production.
Specific embodiment
In order to fully understand the purpose of the present invention, feature and effect, by following specific embodiments, the present invention is made detailed
It describes in detail bright.For process of the invention in addition to following the description, remaining is all made of the conventional method or device of this field.Following nouns
Term is unless otherwise stated, all have the normally understood meaning of those skilled in the art.
Specifically, the present invention provides a kind of think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, packet
Include following steps:
(1) hot rolling curtain bell furnace is used to be warming up to low chrome ferritic stainless steel hot rolled coil with the speed of 30-60 DEG C/h
750-800 DEG C, and keep the temperature 2-5 hours.
Wherein, the hot rolling curtain bell furnace that the present invention uses is perhydro bell-type furnace, by table, heating mantles, inner cover, cold
But composition is covered, coal gas burns nozzle point upper layer and lower layer and is mounted on outer cover, shares eight, the heat of gas-fired passes to interior by radiation
It on cover, then is conducted heat by the heat radiation of inner cover and the circulative convection of protective gas and heat is transmitted to annealing coil, protect gas in furnace
Body is hydrogen, forms convection current in inner cover by table blower, takes away inner cover heat, is transmitted to coil of strip and is heated, after heating,
Outer cover is removed, forced convertion cooling dome is buckled, cold air is sucked by cover bottom, is gone out by cover top row, is cooled down to inner cover.
Wherein, in the low chrome ferritic stainless steel hot rolled coil steel band with a thickness of 6-12mm, belong to thick steel band.
Wherein, it is calculated in mass percent, the low chrome ferritic stainless steel includes: C 0-0.03%, N 0-0.03%, Si
≤ 1.0%, Mn≤1.0%, Cr 10.5%-12.5%, Ti 0.10%-0.30%, remaining is Fe and inevitable impurity.
Wherein, first stage annealing is carried out according to step (1), just enters this steel grade perfect recrystallization initial temperature, fitted
When low temperature soak be conducive to the inside and outside tissue recrystallization row of slab (with a thickness of the low chrome ferritic stainless steel steel plate of 6-12mm)
For the homogenization of starting.
In the first stage in annealing process, when heating rate is less than 30 DEG C/h, then production efficiency is low, when heating rate is big
When 60 DEG C/h, then low chrome ferritic stainless steel hot rolled coil is easy to happen side under interior stress and is split due to uneven heating.When
When annealing temperature is lower than 750 DEG C, then recrystallization behavior cannot occur for crystal grain, and when annealing temperature is greater than 800 DEG C, then crystal grain occurs
Recrystallization behavior uniformity is poor.When soaking time is lower than 2 hours, then slab internal and external temperature is easy uneven, soaking time
When greater than 5 hours, then recrystallization behavior occurs in advance for portion crystal.
(2) low chrome ferritic stainless steel hot rolled coil is continued to be warming up to 830-880 DEG C, and keeps the temperature 10-16 hours.
In some embodiments, the heating rate of the low chrome ferritic stainless steel hot rolled coil can be any value, this hair
It is bright to be not specifically limited.
In some preferred embodiments, the heating rate of the low chrome ferritic stainless steel hot rolled coil is 30-60 DEG C/h.
Wherein, secondary stage annealing is carried out according to the parameter that step (2) limit, slab can be completed (with a thickness of 6-12mm
Low chrome ferritic stainless steel steel plate) tissue recrystallization behavior, reduce hardness, obtain good intensity and elongation percentage.
During secondary stage annealing, when annealing temperature is lower than 830 DEG C, then the recrystallization behavior of slab tissue cannot
It uniformly completes, surface of steel plate hardness is uneven, when annealing temperature is greater than 880 DEG C, then is easy to make surface of steel plate coarse grains, no
Conducive to the punching production of subsequent shaped piece；When soaking time is lower than 10 hours, then there are mixed crystal phenomenons for steel plate tissue crystal grain, no
Conducive to the punching press uniformity of steel plate, when soaking time is greater than 16 hours, then steel plate tissue crystal grain can uniformity tend to be constant, to changing
Kind plate property effect less, but is unfavorable for the promotion of production efficiency.
(3) by the hot rolled coil band insulation cover slow cooling to 500 DEG C -600 DEG C, rapid cooling is come out of the stove, and low chrome ferritic is finally obtained
Stainless steel product.
" band insulation cover slow cooling " of the invention refers to stopping heating after heat preservation, and original state is kept to progressively cool to
Target temperature.
Wherein, the rate of temperature fall of the slow cooling is 10-30 DEG C/h.
" rapid cooling is come out of the stove " of the invention refers to by the way that insulation cover is changed to cooling dome, with 10000Nm3The cooling wind of/h
Amount is rapidly cooled coil of strip, until air-cooled after reaching tapping temperature.
Preferably, after second stage heat preservation, the hot rolled coil band insulation cover slow cooling is come out of the stove to 600 DEG C of rapid cooling.
The yield strength (Rp0.2) of the low chrome ferritic stainless steel product at room temperature is 200-280MPa, and tension is strong
Spending (Rm) is 360-440MPa, hardness (HV)≤135.
The present invention is obtained lower product hardness, is solved at present due to think gauge by cover annealing technical optimization
Ferritic stainless steel not can be carried out on-line continuous annealing production, cause matrix grain coarse, and plasticity decline, brittleness increases, in acid
It washes that bending force in technical process is easy to crack, and the disconnected process difficulties with risk occurs.
In addition, the present invention also provides a kind of low chrome ferritic stainless steel, not by above-mentioned think gauge low chrome ferritic
Steel hot rolling curtain cover annealing method of becoming rusty processing obtains.
Wherein, low chrome ferritic stainless steel of the invention, is calculated in mass percent, comprising: C 0-0.03%, N 0-
0.03%, Si≤1.0%, Mn≤1.0%, Cr 10.5%-12.5%, Ti 0.10%-0.30%, remaining is Fe and can not keep away
The impurity exempted from.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions.
In the low chrome ferritic stainless steel of embodiment 1-6, other than iron and inevitable element, the content of each element is such as
Shown in table 1.Wherein, using perhydro bell-type furnace to the method for annealing of the low chrome ferritic stainless steel hot rolled coil of embodiment 1-6
Technical parameter is shown in Table 2, and the mechanical property of the corresponding low chrome ferritic stainless steel product obtained is shown in Table 3.
The content (%) of each element in 1 low chrome ferritic stainless steel of table
The annealing technology parameter of 2 embodiment 1-6 of table
The low chrome ferritic stainless steel product mechanical property of 3 embodiment 1-6 of table summarizes
In addition, inventor is investigated different annealing technology parameters to the low chrome ferritic stainless steel product capability of embodiment 1
Learn the influence of performance.Wherein, annealing technology parameter is shown in Table 4, and the mechanical property of the final products of acquisition is shown in Table 5.
The annealing technology parameter of table 4 embodiment 7-9 and comparative example 1-2
Note: symbol "-" indicates "None".
The low chrome ferritic stainless steel product mechanical property of table 5 embodiment 7-9 and comparative example 1-2 summarizes
Summarize the think gauge it is found that of the invention by the low chrome ferritic stainless steel product mechanical property shown in table 3 and table 5
The yield strength (Rp0.2) of low chrome ferritic stainless steel product is 200-280MPa, and tensile strength (Rm) is 360-440MPa, firmly
It spends (HV)≤135.Therefore, the present invention obtains lower product hardness, solve at present due to think gauge ferritic stainless steel not
It can be carried out on-line continuous annealing production, cause matrix grain coarse, plasticity decline, brittleness increases, curved during acid cleaning process
Qu Shouli is easy to crack, and the disconnected process difficulties with risk occur, and realizes the continuous acid-washing production of hot rolled coil.
The present invention is hereinbefore disclosed with preferred embodiment, but it should be understood by those skilled in the art that, these
Embodiment is only used for describing the present invention, but should not be understood as limiting the scope of the invention.It should be noted that all implement with these
Example equivalent variation and displacement, should all be set as being covered by scope of the presently claimed invention.Therefore, protection scope of the present invention
It should be subject to range defined in claims.
Claims (9)
1. a kind of think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method, which comprises the following steps:
(1) use hot rolling curtain bell furnace that low chrome ferritic stainless steel hot rolled coil is warming up to 750-800 with the speed of 30-60 DEG C/h
DEG C, and keep the temperature 2-5 hours；
(2) continue the low chrome ferritic stainless steel hot rolled coil to be warming up to 830-880 DEG C, and keep the temperature 10-16 hours；
(3) the hot rolled coil band insulation cover slow cooling is come out of the stove to 500 DEG C of -600 DEG C of rapid cooling, finally obtains low chrome ferritic stainless steel
Product.
2. method for annealing according to claim 1, which is characterized in that the rate of temperature fall of the slow cooling is 10-30 DEG C/h.
3. method for annealing according to claim 1, which is characterized in that the heating rate of heating described in step (2) is 30-
60℃/h。
4. method for annealing according to claim 1, which is characterized in that the hot rolling curtain bell furnace is perhydro bell-type
Furnace.
5. method for annealing according to claim 1, which is characterized in that steel band in the low chrome ferritic stainless steel hot rolled coil
With a thickness of 6-12mm.
6. method for annealing according to claim 1, which is characterized in that be calculated in mass percent, the low chrome ferritic is not
The steel that becomes rusty includes: C 0-0.03%, N 0-0.03%, Si≤1.0%, Mn≤1.0%, Cr 10.5%-12.5%, Ti
0.10%-0.30%, remaining is Fe and inevitable impurity.
7. method for annealing according to claim 6, which is characterized in that the low chrome ferritic stainless steel product is at room temperature
Yield strength (Rp0.2) be 200-280MPa, tensile strength (Rm) be 360-440MPa, hardness (HV)≤135.
8. a kind of low chrome ferritic stainless steel, which is characterized in that by the low ferrochrome element of the described in any item think gauges of claim 1-7
The processing of body stainless steel hot roller shutter cover annealing method obtains.
9. low chrome ferritic stainless steel according to claim 8, which is characterized in that be calculated in mass percent, the low chromium
Ferritic stainless steel includes: C 0-0.03%, N 0-0.03%, Si≤1.0%, Mn≤1.0%, Cr 10.5%-12.5%,
Ti 0.10%-0.30%, remaining is Fe and inevitable impurity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910770551.9A CN110331261A (en) | 2019-08-20 | 2019-08-20 | Think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method |
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| CN201910770551.9A CN110331261A (en) | 2019-08-20 | 2019-08-20 | Think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959194A (en) * | 2022-05-07 | 2022-08-30 | 宁波宝新不锈钢有限公司 | Cover type annealing process for hot-rolled ferritic stainless steel |
| CN115786804A (en) * | 2022-11-28 | 2023-03-14 | 江阴华新特殊合金材料有限公司 | Low-Cr system soft magnetic stainless steel and control method of structure thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959194A (en) * | 2022-05-07 | 2022-08-30 | 宁波宝新不锈钢有限公司 | Cover type annealing process for hot-rolled ferritic stainless steel |
| CN115786804A (en) * | 2022-11-28 | 2023-03-14 | 江阴华新特殊合金材料有限公司 | Low-Cr system soft magnetic stainless steel and control method of structure thereof |
| CN115786804B (en) * | 2022-11-28 | 2023-11-10 | 江阴华新特殊合金材料有限公司 | Low-Cr soft magnetic stainless steel and control method of structure thereof |
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