CN106011681B - A kind of method of raising 316LN austenite stainless steel mechanical properties - Google Patents
A kind of method of raising 316LN austenite stainless steel mechanical properties Download PDFInfo
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- CN106011681B CN106011681B CN201610482610.9A CN201610482610A CN106011681B CN 106011681 B CN106011681 B CN 106011681B CN 201610482610 A CN201610482610 A CN 201610482610A CN 106011681 B CN106011681 B CN 106011681B
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/0273—Final recrystallisation annealing
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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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Abstract
The invention discloses a kind of method of raising 316LN austenite stainless steel mechanical properties, belong to stainless steel preparation field, this method by by thickness be 40~60mm 316LN austenitic stainless steels blank material hot-rolled to 4~5mm thickness plate, pass through cold rolling-annealing process processing again, it is 450~600MPa to be prepared for yield strength, tensile strength is 1020~1220MPa, elongation percentage is more than 50% 316LN austenitic stainless steels, by this method, solve the problems, such as that 316LN austenitic stainless steels yield strength is insufficient in the prior art.The method of the present invention is easily operated, is easy to implement industrialized production.
Description
Technical field
The present invention relates to the preparation of stainless steel, in particular to a kind of side of raising 316LN austenite stainless steel mechanical properties
Method.
Background technology
The requirement of most of stainless steels keeps original appearance of building for a long time, on serious pollution industrial area and edge
Haiti area, surface can be very dirty, or even produce corrosion, but to ensure the aesthetic effect of outdoor environment, need to use and contain nickel and stainless steel,
Austenitic stainless steel is a kind of widely used stainless steel grade, accounts for the 70% of whole stainless steel dosage.316LN austenitic stainless steels
It is a kind of very excellent material, it has fabulous cryogenic property, very strong resistance to corrosion, preferable plasticity and extension
Property, tensile strength are very big, therefore are widely used in cryogenic technique, ocean engineering, biochemical industry and other industry.It is but existing
316LN austenitic stainless steel yield strengths are very low, about 250~400MPa, using being very restricted in structural member.With
The high speed development of human society, requirements at the higher level are proposed to 316LN austenitic stainless steel yield strengths performance, become high-strength high-plastic
One of property austenitic stainless steel motive force of development.
In enhancements, common solution strengthening effect has reached ultimate attainment.Many intensifying methods cannot take into account intensity with
Plasticity, is often that intensity improves, plasticity is but remarkably decreased.And intensity can not only be significantly increased in crystal grain thinning, moreover it is possible to protect
Hold plasticity to be basically unchanged or by a small margin decline, therefore intensity can be improved using deformation method for grain refinement.
In recent years, research has shown that strain inducing martensite combination annealing process is that a kind of refinement austenitic stainless steel is brilliant
The effective ways of grain.Cold deformation converts the austenite into strain induced martensite, recrystallizes martensite back with after annealing and is received
Meter Jing/Ultra-fine Grained austenite, this method have been obtained for excellent strength and the matched austenitic stainless steel of plasticity.It is this high in the wrong
Nanocrystalline/Ultra-fine Grained the austenitic stainless steel for taking intensity obtains phase in excellent yield strength and deformation process by refined crystalline strengthening
Become induced plastic (TRIP) effect or twin crystal induction plastic (TWIP) effect obtains fabulous plasticity, show fabulous performance
Advantage.
The method of existing crystal grain thinning, is often limited by the process conditions of equipment and harshness so that fine grain/Ultra-fine Grained
The production of 316LN austenitic stainless steels is very difficult with preparing, and leverages the using effect in later stage.Equal channel angular pressing platen press can
Effectively to obtain nanocrystalline or Ultra-fine Grained, but this method is only limitted to intensity is low, ductility is good material.
The content of the invention
The purpose of the present invention is cause yield strength is too low to ask for existing 316LN austenitic stainless steels coarse grains
Topic, there is provided a kind of method of raising 316LN austenite stainless steel mechanical properties, can obtain yield strength by this method is
450~600MPa, tensile strength are 1020~1220MPa, and elongation percentage is more than 50% 316LN austenitic stainless steels, and this hair
Bright method is easy to operate, industrialized production easy to implement.
Realizing the technical solution that the object of the invention uses is：A kind of side of raising 316LN austenite stainless steel mechanical properties
Method, the chemical composition (quality %) of used 316LN austenitic stainless steels are：C≤0.05, Si≤0.5, Mn≤1.5,
Cr16.0~20.0, Ni7.0~11.0, S≤0.03, P≤0.045, Mo0.01~2.0, N≤0.001, remaining is Fe and can not
Avoid impurity.
Comprise the following steps that：
(1) hot rolling
By the 316LN austenite stainless steel ingots of said components be forged into thickness be 40~60mm blank, by blank with
Stove heat is to 1180~1250 DEG C and keeps the temperature 1~5h, then rolls into the hot rolled plate of 4~5mm thickness, start rolling temperature and finishing temperature point
Wei not be 1170~1220 DEG C and 1070~1120 DEG C, with the cooldown rate water cooling of 25~35 DEG C/s to 120~170 after hot rolling
DEG C, then it is air-cooled to room temperature.
(2) cold rolling-annealing is carried out to hot rolled plate
Cold rolling is carried out to hot rolled plate with cold-rolling mill at room temperature, is made annealing treatment after cold rolling, by the furnace temperature liter of heating furnace
The plate of rolling is put into 1~1000s of insulation after to 700~1000 DEG C, is then rapidly cooled to room temperature.
Particularly, heating furnace used in above-mentioned annealing process is heat treatment chamber type electric resistance furnace.
By aforesaid operations, the yield strength for obtaining the stainless steel is 450~600MPa, tensile strength for 1020~
1220MPa, elongation percentage are more than 50%.
The present invention has the advantages that notable：
1) present invention uses cold rolling-annealing process, and grain refining effect is notable, can be by 316LN austenitic stainless steels
Crystallite dimension is refined to 4~4.5 μm.
2) cold rolling of the present invention is to carry out at room temperature, and is prepared receive using cold rolling-annealing process both at home and abroad at present
Meter level austenitic stainless steel, cold rolling are that low temperature either ultralow temperature carries out mostly.The present invention is easier to industrialized production.
3) annealing of the present invention is carried out in resistance-type heating furnace, is more nearly practical condition.
Brief description of the drawings
Fig. 1 is engineering stress-engineering strain curve map of the 316LN austenitic stainless steels after embodiment is handled.
Fig. 2 is to be schemed in embodiment with EBSD of the steel after cold rolling-annealing process processing.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
First, the present embodiment uses following equipment：Hot-rolling mill is 450 hot-rolling mills of φ, cold-rolling mill is 325 × 400mm of φ
Four-roller Straight pull reversable cold-rolling machine, annealing are heat treatment chamber type electric resistance furnace with heating furnace.
The concrete operations of the method for the present invention are as follows：
Take the component (wt.%) of 316LN austenitic stainless steels as follows：C is 0.04, Si 0.34, and Mn 1.15, Cr are
18.06, Ni 8.33, S 0.03, P 0.04, Mo 0.051, N 0.0008, remaining is Fe and inevitable impurity.
The 316LN austenite stainless steel ingots of said components are forged into the blank that thickness is 45~50mm with hot-rolling mill,
Blank to 1200~1220 DEG C and is kept the temperature into 2.5~3h with stove heat, then rolls into the hot rolled plate of 4mm thickness, start rolling temperature and end
It is respectively 1185~1205 DEG C and 1085~1100 DEG C to roll temperature, with the cooldown rate water cooling of 30 DEG C/s to 138 after hot rolling
~142 DEG C, then it is air-cooled to room temperature.
Cold rolling-annealing is then carried out on cold-rolling mill to hot rolled plate：
Cold rolling is carried out to hot rolled plate with cold-rolling mill at room temperature, is made annealing treatment after cold rolling by heating furnace, will be heated
The furnace temperature of stove rises to after 900 DEG C the plate of rolling being put into insulation 300s, is then rapidly cooled to room temperature.Martensite during it is organized
Austenite is completely transformed into, it is almost isometric different from the lath morphological structure formed during cold deformation, austenite grain
Type.
Engineering stress-engineering strain curve map of 316LN austenitic stainless steels is as schemed after the processing of the present embodiment method
Shown in 1, the 316LN austenitic stainless steel yield strengths after processing significantly improve, and tensile strength also significantly improves.Fig. 2 is implementation
Schemed in example with EBSD of the steel after cold rolling-annealing process processing, the crystal grain of the 316LN austenitic stainless steels after processing is substantially thin
Change, 4~4.5 μm of crystallite dimension.
Mechanical property tests are carried out to experiment steel, the yield strength that the present embodiment obtains the stainless steel is 487.4MPa, is resisted
Tensile strength is 1050.5MPa, elongation percentage 58.0%.
Claims (3)
- A kind of 1. method of raising 316LN austenite stainless steel mechanical properties, it is characterised in that including：S100, hot rolling316LN austenite stainless steel ingots are forged into the blank that thickness is 40~60mm, the 316LN austenitic stainless steels Mass percentage content be：C≤0.05, Si≤0.5, Mn≤1.5, Cr16.0~20.0, Ni7.0~11.0, S≤0.03, P ≤ 0.045, Mo0.01~2.0, N≤0.001, remaining is Fe and inevitable impurity；By blank with stove heat to 1180~ 1250 DEG C and 1~5h of insulation, then roll into the hot rolled plate of 4~5mm thickness；Hot-rolling method is：Start rolling temperature and finishing temperature difference For 1170~1220 DEG C and 1070~1120 DEG C, with the cooldown rate water cooling of 25~35 DEG C/s to 120~170 after hot rolling DEG C, then it is air-cooled to room temperature；S200, carry out cold rolling-annealing to hot rolled plateCold rolling is carried out to hot rolled plate with cold-rolling mill at room temperature, the overall reduction of cold rolling is 30~90%, is annealed after cold rolling Processing, the furnace temperature of heating furnace is risen to after 700~1000 DEG C the plate of rolling is put into 1~1000s of insulation, then rapid cooling To room temperature.
- 2. the method for 316LN austenite stainless steel mechanical properties is improved according to claim 1, it is characterised in that step Heating furnace described in S200 is heat treatment chamber type electric resistance furnace.
- 3. the method for 316LN austenite stainless steel mechanical properties is improved according to claim 1, it is characterised in that by this 316LN austenitic stainless steels yield strength made from method is 450~600MPa, and tensile strength is 1020~1220MPa, extension Rate is more than 50%.
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| CN110408757A (en) * | 2018-04-28 | 2019-11-05 | 南京理工大学 | A kind of preparation method of high-strength plasticity matching 316L stainless steel materials |
| EP3640352A1 (en) * | 2018-10-17 | 2020-04-22 | AB Sandvik Materials Technology | Method of producing tube of duplex stainless steel |
| CN112831722B (en) * | 2020-12-31 | 2022-05-06 | 武汉科技大学 | Ultrathin ultrahigh-strength austenitic stainless steel and production method thereof |
| CN112831640B (en) * | 2020-12-31 | 2022-10-21 | 武汉科技大学 | Production method of austenitic stainless steel with yield strength of more than or equal to 980MPa |
| CN113046534B (en) * | 2021-03-15 | 2023-02-03 | 长春工业大学 | Preparation method of high-nitrogen nickel-free austenitic stainless steel with high twin crystal density |
| CN114480807B (en) * | 2022-01-27 | 2023-04-11 | 东北大学 | Preparation method of complete recrystallization ultrafine-grained 316LN stainless steel plate |
| CN115287426A (en) * | 2022-08-03 | 2022-11-04 | 南京理工大学 | 316L stainless steel with block nano structure and preparation method thereof |
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| JP3296723B2 (en) * | 1996-07-23 | 2002-07-02 | 川崎製鉄株式会社 | Austenitic stainless hot-rolled steel sheet excellent in deep drawability and method for producing the same |
| EP2072631A1 (en) * | 2007-12-20 | 2009-06-24 | Ugine & Alz France | Austenitic stainless steel sheet and method for obtaining this sheet |
| CN102994905B (en) * | 2012-11-01 | 2014-07-23 | 北京科技大学 | Preparation method of micro/nano-structure ultrahigh-strength plastic stainless steel containing Nb |
| CN104152804B (en) * | 2014-08-01 | 2015-12-30 | 山西太钢不锈钢股份有限公司 | A kind of nickel-free metastable austenitic stainless steel material and preparation method thereof |
| CN104451082B (en) * | 2014-12-10 | 2016-08-24 | 东北大学 | A kind of preparation method of the average grain size 304 austenitic stainless steels less than 100nm |
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Effective date of registration: 20180930 Address after: 214423 No. 1, Qian Men Road, Zhouzhuang Town, Jiangyin City, Wuxi, Jiangsu. Patentee after: Jiangyin Jinsong science and Technology Co., Ltd. Address before: 430081 Peace Avenue, Qingshan District, Wuhan, Hubei 947 Patentee before: Wuhan University of Science and Technology |