CN106591736B - High-strength low straight-chromiun stainless steel and its heat treatment method - Google Patents
High-strength low straight-chromiun stainless steel and its heat treatment method Download PDFInfo
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- CN106591736B CN106591736B CN201611143713.9A CN201611143713A CN106591736B CN 106591736 B CN106591736 B CN 106591736B CN 201611143713 A CN201611143713 A CN 201611143713A CN 106591736 B CN106591736 B CN 106591736B
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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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- 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
- C21D2211/008—Martensite
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- Heat Treatment Of Steel (AREA)
Abstract
High-strength low straight-chromiun stainless steel and its heat treatment method are disclosed, by weight percentage, which includes 0<C≤0.05%, 0<Si≤1.0%, 0<Mn≤2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni≤1.0%, 0<Ti+Nb≤0.5%, surplus are Fe and other inevitable impurity.The high-strength low straight-chromiun stainless steel yield strength is more than or equal to 500MPa, and heat treatment cycle shortens dramatically, and is promoted so as to large-scale engineering applications.
Description
Technical field
The application relates generally to stainless steel field.Specifically, this application involves high-strength low straight-chromiun stainless steel and its heat treatments
Method.
Background technology
It is the low chrome ferritic stainless steel of representative with South Africa 3Cr12, U.S. S41003 and Germany 1.4003 etc., due to having
Good mechanical property, corrosion resisting property and low overall life cycle cost are increasingly becoming engineering structure part carbon steel, weathering steel
With the alternative materials of coating plate etc..This kind of stainless steel Cr equivalents are relatively low, can be formed in ferrite matrix after hot rolling and air cooling
A small amount of martensite, therefore there is higher intensity.But the corresponding plasticity of material is poor (elongation percentage is about 10%) at this time, can not
Direct engineer application.For this purpose, usually coil of strip will carry out long term annealing processing in 700 DEG C -750 DEG C of bell furnace.
It summarizes
On the one hand, this application involves high-strength low straight-chromiun stainless steel, by weight percentage, it includes 0<C≤0.05%, 0<Si
≤ 1.0%, 0<Mn≤2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni
≤ 1.0%, 0<Ti+Nb≤0.5%, surplus are Fe and other inevitable impurity.
On the other hand, this application involves heat treatment methods comprising：A) high-strength low straight-chromiun stainless steel, by weight percentage are provided
Than meter, the high-strength low straight-chromiun stainless steel includes 0<C≤0.05%, 0<Si≤1.0%, 0<Mn≤2.00%, P≤0.045%, S
≤ 0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni≤1.0%, 0<Ti+Nb≤0.5%, surplus be Fe and
Other inevitable impurity；And continuous annealing treatment b) is carried out to the pending stainless steel, wherein the continuous annealing
Heat treatment temperature in processing is 800 DEG C -900 DEG C.
In another aspect, this application involves high-strength low straight-chromiun stainless steel, wherein the high-strength low straight-chromiun stainless steel passes through continuous annealing
Processing, by weight percentage, the high-strength low straight-chromiun stainless steel include 0<C≤0.05%, 0<Si≤1.0%, 0<Mn≤
2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni≤1.0%, 0<Ti+
Nb≤0.5%, surplus are Fe and other inevitable impurity.
Brief Description Of Drawings
Fig. 1 is the microstructure picture for the high-strength low straight-chromiun stainless steel that embodiment 1 produces.
It is described in detail
In the following description, including certain concrete details to each disclosed embodiment to provide comprehensive reason
Solution.However, those skilled in the relevant art are not, it will be recognized that use one or more of these concrete details, and use other
Embodiment is still realized in the case of method, component, material etc..
Unless required otherwise in the application, in the whole instruction and appended claims, word " comprising ", " packet
Containing ", " containing " and " having " should be interpreted that meaning that is open, including formula, i.e., " include but not limited to ".
" embodiment " mentioned throughout the specification, " embodiment ", " in another embodiment " or " at certain
In a little embodiments " mean an at least embodiment include with described in the embodiment it is relevant with specific reference to element,
Structure or feature.Therefore, throughout the specification different location occur phrase " in one embodiment " or " in embodiment
In " or " in another embodiment " or " in certain embodiments " same embodiment need not be all referred to.In addition, specifically wanting
Element, structure or feature can combine in one or more embodiments in any suitable manner.
Definition
Herein, " austenite " means the nonmagnetic solid solution that a small amount of carbon is dissolved in γ-Fe, with face-centered cubic knot
Structure.Austenite plasticity is preferable, and intensity is relatively low, has certain toughness, does not have ferromagnetism.
Herein, " martensite " means supersaturated solid solution of the carbon in α-Fe, with body-centered structure of the quartet.It is higher
Intensity and hardness be martensite in steel one of main feature.
Herein, " ferrite " means interstitial solid solution of the carbon dissolution in α-Fe, with body-centered cubic lattic, often
It is indicated with symbol F.Pure ferritic structure has good plasticity and toughness, but intensity and hardness are all relatively low.
Herein, " room temperature " means 25 DEG C ± 5 DEG C.
Herein, " plasticity and toughness " mean the general designation of stainless steel material plasticity and toughness.
Herein, " plasticity " is meant under external force, and permanent deformation can steadily occur for stainless steel material without broken
The ability of its bad integrality.
Herein, " toughness " means stainless steel material in the ability for being plastically deformed with absorbing energy in fracture process.
Herein, " elongation percentage (δ) " means the total deformation Δ L and original gauge length of gauge length section after stainless steel curved beam tension failure
The percentage of the ratio between length L：δ=Δ L/L × 100%.
Herein, " yield strength " means yield limit when yield phenomenon occurs for stainless steel material, here using rule
Determine stress value when Non-proportional extension rate is 0.2%.
Herein, " tensile strength " means that stainless steel material bears maximum stress value before breaking.
Herein, " average cooling rate " means (- 300 DEG C of heat treatment temperature)/(stainless steel comes out from continuous annealing furnace
It is cooled to the time used in 300 DEG C).
Specific embodiment
On the one hand, this application involves high-strength low straight-chromiun stainless steel, by weight percentage, it includes 0<C≤0.05%, 0<Si
≤ 1.0%, 0<Mn≤2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni
≤ 1.0%, 0<Ti+Nb≤0.5%, surplus are Fe and other inevitable impurity.
In certain embodiments, C is austenite former, while being also solution strengthening element, however C content is excessively high
The corrosion resistance and plasticity and toughness of steel, therefore, by weight percentage 0 can be reduced<C≤0.05%.
In certain embodiments, deoxidation from Si is in steel-making, while being also ferrite former, suitable silicon
Intensity and corrosion resistance can be improved, however the toughness of steel, therefore, by weight percentage 0 can be deteriorated when Si too high levels<Si≤
1.0%.
In certain embodiments, Mn and Ni is all austenite former, and Mn, which is added, can make steel form more high temperature Austria
Family name's body is conducive to improve intensity to obtain more martensites in follow-up cooling procedure；Mn prices are low more than Ni simultaneously, with
Mn can reduce the cost of steel for Ni.However excessively high Mn contents are unfavorable to the corrosion resistance of steel, and therefore, by weight percentage 0<Mn
≤ 2.0%.
In certain embodiments, P, S are the inevitable impurity element of steel-making, while unfavorable to Steel Properties, therefore its
Content should be low as possible, by weight percentage P≤0.045%, S≤0.03%.
In certain embodiments, N is austenite former, and a small amount of nitrogen can play solution strengthening and tissue modulation
Effect, however the excessively high toughness that can reduce steel of N content, therefore, by weight percentage 0<N≤0.03%.
In certain embodiments, Cr is main anti-corrosion element, and the content the high more is conducive to improve the corrosion resisting property of steel；
Cr is also ferrite former, and too high levels are unfavorable for the formation of martensite and intensity in steel and improve, while excessively high Cr
Content can also increase the cost of steel, therefore 10.5%≤Cr≤13.5% by weight percentage.
In certain embodiments, Ni is austenite former, the austenite structure ratio of steel when can increase high temperature,
It is also beneficial to the toughness of steel simultaneously.However Ni contents, more than after certain value, the increased amplitude of effect becomes smaller.In addition, Ni resources have
Limit, for strategic element, expensive and fluctuation is big, therefore, by weight percentage 0<Ni≤1.0%.
In certain embodiments, Ti, Nb are strong carbonitride-forming elements, and a certain amount of Ti, Nb is added can be preferential
Extra carbon in steel, nitrogen are fixed, the Carbonitride Precipitation of Cr is avoided, improves the corrosion resisting property of steel；Ti, Nb is precipitated
Carbonitride can improve the mechanical property of steel with crystal grain thinning.However excessive Ti, Nb can cause surface defect and be added to
This, therefore Ti, Nb total amount>0 and≤0.5%.
In certain embodiments, in order to ensure the application high-strength low straight-chromiun stainless steel have high intensity and good modeling
Property, it is about 2.1-3.6 that the chemical composition of the stainless steel, which should meet the size of components Factor M, wherein M=[Cr+6Si+5 (Ti+
Nb)]/[4Ni+2Mn+40(C+N)].Components Factor M reflects ferrite former and austenite former content is opposite
Ratio.Components Factor M values are bigger, illustrate that the ferrite former content of stainless steel is more, and corresponding stainless hardness of steel is low, plasticity
It is good.On the contrary, components Factor M values are smaller, illustrate that the austenite former content of stainless steel is more, can be formed after cooling more
Martensite, corresponding stainless hardness of steel is high, plasticity is poor.
On the other hand, this application involves heat treatment methods comprising：
A) pending stainless steel is provided, by weight percentage, the stainless composition of steel includes 0<C≤0.05%, 0<Si
≤ 1.0%, 0<Mn≤2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni
≤ 1.0%, 0<Ti+Nb≤0.5%, surplus are Fe and other inevitable impurity；And
B) continuous annealing treatment is carried out to the pending stainless steel, wherein the heat treatment temperature in the continuous annealing treatment
Degree is 800 DEG C -900 DEG C.
In certain embodiments, it can be used in the illustrative examples packet of the equipment of the carry out continuous annealing treatment of the application
It includes but is not limited to continuous annealing furnace.
In certain embodiments, it can be used in the corresponding guarantor of every millimeter of stainless steel thickness in the heat treatment method of the application
The warm time is 0.5min-3.0min.
In certain embodiments, it can be used in average cooling rate≤40 DEG C/s in the heat treatment method of the application.
In certain embodiments, the heat treatment postcooling in annealing is to room temperature.
In certain embodiments, after the heating and thermal insulation process of heat treatment, with the average cooling speed of≤40 DEG C/s
Rate is cooled to room temperature.
In certain embodiments, the stainless steel that can be used in the application heat treatment method is coil of strip.
In certain embodiments, the stainless steel that can be used in the application heat treatment method is rolled.
In certain embodiments, the stainless steel thickness that can be used in the application heat treatment method is about 2.0mm-
12.0mm.In certain embodiments, the stainless steel thickness that can be used in the application heat treatment method is about 4.0mm-
7.0mm。
In certain embodiments, it can be used in the exemplary reality of the high-strength low straight-chromiun stainless steel of the heat treatment method of the application
Example includes but not limited to high-strength low straight-chromiun stainless steel coil of strip.
In certain embodiments, the illustrative examples that can be used in the high-strength low straight-chromiun stainless steel coil of strip of the application include but
It is not limited to rolled coil of strip.
In certain embodiments, in order to make stainless steel obtain comparatively fine crystal grain, it can be used in every milli of the application
The corresponding soaking time of the low straight-chromiun stainless steel thickness of meter Gao Qiang is about 0.5min-3.0min.In certain embodiments, in order to make not
Rust steel obtains comparatively fine crystal grain, can be used in the corresponding soaking time of every millimeter of the application high-strength low straight-chromiun stainless steel thickness
About 1.5min-3.0min.In certain embodiments, in order to make stainless steel obtain comparatively fine crystal grain, it can be used in this
The corresponding soaking time of every millimeter of application high-strength low straight-chromiun stainless steel thickness is about 1.5min-2.3min.
In certain embodiments, by the elongation percentage of the heat treatment method of the application treated high-strength low straight-chromiun stainless steel
About it is more than or equal to 20%.
In certain embodiments, the surrender by the heat treatment method of the application treated high-strength low straight-chromiun stainless steel is strong
Degree is about more than or equal to 500MPa.
In certain embodiments, the size that the chemical composition of high-strength low straight-chromiun stainless steel tool should meet components Factor M is about
2.1-3.6, wherein M=[Cr+6Si+5 (Ti+Nb)]/[4Ni+2Mn+40 (C+N)].Components Factor M reflects ferrite and is formed
Element and austenite former content relative scale.Components Factor M values are bigger, illustrate that the ferrite former of stainless steel contains
Measure more, corresponding stainless hardness of steel is low, plasticity is good.On the contrary, components Factor M values are smaller, illustrate the austenitic formation of stainless steel
Constituent content is more, and more martensites can be formed after cooling, and corresponding stainless hardness of steel is high, plasticity is poor.
In certain embodiments, there is Fig. 1 institutes by the high-strength low straight-chromiun stainless steel that the heat treatment method of the application obtains
The microscopic structure shown.
The heat treatment temperature of continuous annealing in the heat treatment method of the application is higher, can make the abundant austenite of stainless steel
Change, more martensites is formed after cooling, to improve intensity.In addition, higher heat treatment temperature can also quickly eliminate change
Shape tissue improves the plasticity and toughness of stainless steel.Moderate soaking time can make stainless steel obtain tiny institutional framework, to improve
Intensity and plasticity and toughness.Slower cooling rate can make stainless steel that martensite self tempering occur in cooling procedure, can further increase
Add the plasticity and toughness of steel.
In addition, compared with the cover annealing of this field routine, the annealing cycle of the heat treatment method of the application greatly contracts
It is short.Average steel≤3 ton being heat-treated per hour of the bell furnace of this field routine, and continuously moving back in the heat treatment method of the application
Fire steel >=5 ton heat treatable per hour.
In another aspect, this application involves high-strength low straight-chromiun stainless steel, wherein the high-strength low straight-chromiun stainless steel is by continuously moving back
Fire processing obtains, and by weight percentage, the high-strength low straight-chromiun stainless steel includes 0<C≤0.05%, 0<Si≤1.0%, 0<Mn
≤ 2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni≤1.0%, 0<Ti
+ Nb≤0.5%, surplus are Fe and other inevitable impurity.
In certain embodiments, in order to ensure the application high-strength low straight-chromiun stainless steel have high intensity and good modeling
Property, it is about 2.1-3.6 that the chemical composition of the stainless steel, which should meet the size of components Factor M, wherein M=[Cr+6Si+5 (Ti+
Nb)]/[4Ni+2Mn+40(C+N)].Components Factor M reflects ferrite former and austenite former content is opposite
Ratio.Components Factor M values are bigger, illustrate that the ferrite former content of stainless steel is more, and corresponding stainless hardness of steel is low, plasticity
It is good.On the contrary, components Factor M values are smaller, illustrate that the austenite former content of stainless steel is more, can be formed after cooling more
Martensite, corresponding stainless hardness of steel is high, plasticity is poor.
Hereinafter, the application will be explained in detail by following examples and attached drawing to more fully understand the application
Various aspects and its advantage.It is simply used for illustrating the application it will be appreciated, however, that embodiment below is non-limiting
Certain embodiments.
Embodiment
Embodiment 1
The pending coils of hot-rolled steel that thickness is 2.12mm is obtained by the method for smelting-continuous casting and hot rolling, chemical composition is shown in
Table 1.Wherein about 830 DEG C of hot rolling finishing temperature crimps in rolls after section cooling when about 630 DEG C.
Then coil of strip is heat-treated in continuous annealing line, heat treatment temperature is 830 DEG C, per mm of thickness steel plate pair
The soaking time answered is 3.0min, and it is stainless to be finally cooled to room temperature the low chromium of acquisition high intensity with the average cooling rate of 30 DEG C/s
Steel.Specific mechanical property and heat treatment efficiency (tonnage of handled steel in the unit interval) are shown in Table 2.The high-strength low straight-chromiun stainless steel tool
There is microscopic structure shown in FIG. 1.
Embodiment 2
The pending coils of hot-rolled steel that thickness is 4.01mm is obtained by the method for smelting-continuous casting and hot rolling, chemical composition is shown in
Table 1.Wherein about 850 DEG C of hot rolling finishing temperature crimps in rolls after section cooling when about 640 DEG C.
Then coil of strip is heat-treated in continuous annealing line, heat treatment temperature is 850 DEG C, per mm of thickness steel plate pair
The soaking time answered is 2.3min, and it is stainless to be finally cooled to room temperature the low chromium of acquisition high intensity with the average cooling rate of 21 DEG C/s
Steel.Specific mechanical property and heat treatment efficiency (tonnage of handled steel in the unit interval) are shown in Table 2.The high-strength low straight-chromiun stainless steel tool
There is the microscopic structure similar with Fig. 1.
Embodiment 3
The pending coils of hot-rolled steel that thickness is 7.08mm is obtained by the method for smelting-continuous casting and hot rolling, chemical composition is shown in
Table 1.Wherein about 845 DEG C of hot rolling finishing temperature crimps in rolls after section cooling when about 630 DEG C.
Then coil of strip is heat-treated in continuous annealing line, heat treatment temperature is 870 DEG C, per mm of thickness steel plate pair
The soaking time answered is 1.5min, and it is stainless to be finally cooled to room temperature the low chromium of acquisition high intensity with the average cooling rate of 12 DEG C/s
Steel.Specific mechanical property and heat treatment efficiency (tonnage of handled steel in the unit interval) are shown in Table 2.The high-strength low straight-chromiun stainless steel tool
There is the microscopic structure similar with Fig. 1.
Embodiment 4
The pending coils of hot-rolled steel that thickness is 11.96mm, chemical composition are obtained by the method for smelting-continuous casting and hot rolling
It is shown in Table 1.Wherein about 835 DEG C of hot rolling finishing temperature crimps in rolls after section cooling when about 635 DEG C.
Then coil of strip is heat-treated in continuous annealing line, heat treatment temperature is 890 DEG C, per mm of thickness steel plate pair
The soaking time answered is 0.5min, is finally cooled to room temperature with the average cooling rate of 5 DEG C/s and obtains the low straight-chromiun stainless steel of high intensity.
Specific mechanical property and heat treatment efficiency (tonnage of handled steel in the unit interval) are shown in Table 2.The high-strength low straight-chromiun stainless steel has
The microscopic structure similar with Fig. 1.
The chemical composition unit of 1 embodiment 1-4 steel of table：W.t.%
| Embodiment | C | Si | Mn | P | S | Cr | Ni | N | Ti+Nb | Components Factor M |
| 1 | 0.05 | 0.1 | 0.3 | 0.045 | 0.03 | 10.5 | 0.05 | 0.03 | 0.5 | 3.4 |
| 2 | 0.03 | 0.5 | 1.1 | 0.031 | 0.02 | 11.5 | 0.3 | 0.02 | 0.3 | 3.0 |
| 3 | 0.02 | 0.8 | 1.6 | 0.023 | 0.01 | 12.3 | 0.6 | 0.01 | 0.11 | 2.6 |
| 4 | 0.01 | 1.0 | 2.0 | 0.005 | 0.001 | 13.5 | 1.0 | 0.008 | 0.05 | 2.3 |
2 embodiment 1-4 Heat-Treatments of Steel parameter of table, mechanical property and heat treatment efficiency
It can be seen that by rational composition design and/or continuous annealing process parameter, low straight-chromiun stainless steel is made to obtain carefully
Small ferrite+tempered martensite (see Fig. 1) obtains higher intensity under the premise of ensureing elongation percentage >=20%
(yield strength >=500MPa) and faster rhythm of production (heat treatment cycle shortens dramatically), pushes away to be more conducive to engineer application
Extensively.
From the foregoing it is appreciated that although the purpose for exemplary illustration describes specific embodiments of the present invention,
But under condit without departing from the spirit and scope of the present invention, technical staff described in this field can make various modifications or change
Into.These deformations or modification should all fall into the application scope of the appended claims.
Claims (24)
1. high-strength low straight-chromiun stainless steel, by weight percentage, it includes 0<C≤0.05%, 0<Si≤1.0%, 0<Mn≤
2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<Ni≤1.0%, 0<Ti+
Nb≤0.5%, surplus are Fe and other inevitable impurity, and components Factor M is 2.1-3.6, wherein M=[Cr+6Si+5
(Ti+Nb)]/[4Ni+2Mn+40(C+N)]。
2. heat treatment method comprising：
A) pending stainless steel is provided, by weight percentage, the pending stainless composition of steel includes 0<C≤0.05%, 0<
Si≤1.0%, 0<Mn≤2.00%, P≤0.045%, S≤0.03%, 0<N≤0.03%, 10.5%≤Cr≤13.5%, 0<
Ni≤1.0%, 0<Ti+Nb≤0.5%, surplus are Fe and other inevitable impurity；And
B) continuous annealing treatment is carried out to the pending stainless steel, wherein the heat treatment temperature in the continuous annealing treatment is
800℃-900℃。
3. heat treatment method as claimed in claim 2, wherein the pending stainless steel is stainless-steel roll.
4. heat treatment method as claimed in claim 2, wherein the corresponding soaking time of every millimeter of stainless steel thickness is 0.5min-
3.0min。
5. heat treatment method as claimed in claim 3, wherein the corresponding soaking time of every millimeter of stainless steel thickness is 0.5min-
3.0min。
6. the heat treatment method as described in any claim in claim 2 to 5, wherein flat in the continuous annealing treatment
Equal cooling rate≤40 DEG C/s.
7. the heat treatment method as described in any claim in claim 2 to 5, wherein the pending stainless steel is hot rolling
State.
8. heat treatment method as claimed in claim 6, wherein the pending stainless steel is rolled.
9. heat treatment method as claimed in claim 7, wherein the thickness of the pending stainless steel is 2.0mm-12mm.
10. heat treatment method as claimed in claim 8, wherein the thickness of the pending stainless steel is 2.0mm-12mm.
11. the heat treatment method as described in any claim in claim 2 to 5, wherein the high-strength low straight-chromiun stainless steel
Components Factor M is 2.1-3.6, wherein M=[Cr+6Si+5 (Ti+Nb)]/[4Ni+2Mn+40 (C+N)].
12. heat treatment method as claimed in claim 6, wherein the components Factor M of the high-strength low straight-chromiun stainless steel is 2.1-
3.6, wherein M=[Cr+6Si+5 (Ti+Nb)]/[4Ni+2Mn+40 (C+N)].
13. heat treatment method as claimed in claim 7, wherein the components Factor M of the high-strength low straight-chromiun stainless steel is 2.1-
3.6, wherein M=[Cr+6Si+5 (Ti+Nb)]/[4Ni+2Mn+40 (C+N)].
14. heat treatment method as claimed in claim 8, wherein the components Factor M of the high-strength low straight-chromiun stainless steel is 2.1-
3.6, wherein M=[Cr+6Si+5 (Ti+Nb)]/[4Ni+2Mn+40 (C+N)].
15. heat treatment method as claimed in claim 9, wherein the components Factor M of the high-strength low straight-chromiun stainless steel is 2.1-
3.6, wherein M=[Cr+6Si+5 (Ti+Nb)]/[4Ni+2Mn+40 (C+N)].
16. heat treatment method as claimed in claim 10, wherein the components Factor M of the high-strength low straight-chromiun stainless steel is 2.1-
3.6, wherein M=[Cr+6Si+5 (Ti+Nb)]/[4Ni+2Mn+40 (C+N)].
17. the heat treatment method as described in any claim in claim 2 to 5, wherein high-strength after continuous annealing treatment
Elongation percentage >=20% of low straight-chromiun stainless steel.
18. heat treatment method as claimed in claim 6, the elongation percentage of the high-strength low straight-chromiun stainless steel wherein after continuous annealing treatment
>=20%.
19. heat treatment method as claimed in claim 7, the elongation percentage of the high-strength low straight-chromiun stainless steel wherein after continuous annealing treatment
>=20%.
20. heat treatment method as claimed in claim 8, the elongation percentage of the high-strength low straight-chromiun stainless steel wherein after continuous annealing treatment
>=20%.
21. heat treatment method as claimed in claim 9, the elongation percentage of the high-strength low straight-chromiun stainless steel wherein after continuous annealing treatment
>=20%.
22. heat treatment method as claimed in claim 10, the extension of the high-strength low straight-chromiun stainless steel wherein after continuous annealing treatment
Rate >=20%.
23. heat treatment method as claimed in claim 11, the extension of the high-strength low straight-chromiun stainless steel wherein after continuous annealing treatment
Rate >=20%.
24. the heat treatment method as described in any claim in claim 12 to 16, the wherein height after continuous annealing treatment
Elongation percentage >=20% of strong low straight-chromiun stainless steel.
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