CN113025872B - Chromium-manganese-nickel-nitrogen austenitic stainless steel and manufacturing method thereof - Google Patents
Chromium-manganese-nickel-nitrogen austenitic stainless steel and manufacturing method thereof Download PDFInfo
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 41
- MPQIMOMLTNCGNB-UHFFFAOYSA-N [N].[Mn].[Ni].[Cr] Chemical compound [N].[Mn].[Ni].[Cr] MPQIMOMLTNCGNB-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000000137 annealing Methods 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 238000005266 casting Methods 0.000 claims abstract description 18
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000005097 cold rolling Methods 0.000 claims abstract description 9
- 238000005554 pickling Methods 0.000 claims abstract description 7
- 229910000863 Ferronickel Inorganic materials 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 239000011572 manganese Substances 0.000 claims description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 17
- 239000011651 chromium Substances 0.000 claims description 15
- 239000011573 trace mineral Substances 0.000 claims description 5
- 235000013619 trace mineral Nutrition 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims 1
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/002—Stainless steels
-
- 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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
-
- 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
- C21D2211/001—Austenite
Abstract
The invention provides chromium-manganese-nickel-nitrogen austenitic stainless steel and a manufacturing method thereof, wherein the method comprises the following steps of: smelting by charging ferronickel into a furnace AOD, continuously casting a plate blank, continuously rolling, annealing and pickling, cold rolling and bright annealing; the chromium-manganese-nickel-nitrogen austenitic stainless steel comprises the following chemical components in percentage by weight: 0.13-0.15 wt%, Si is less than or equal to 0.50wt%, Mn: 9.00-9.40 wt%, P is less than or equal to 0.050wt%, S is less than or equal to 0.005wt%, and Cr: 14.00-14.40 wt%, N: 0.177 wt%, 0.183wt%, 0.186wt%, or 0.188wt%, Cu: 0.25 to 0.35 wt%, Ni: 1.1-1.5 wt%, the pouring temperature of a tundish in the slab continuous casting process is 1500-1530 ℃, and the casting blank drawing speed is 1.0-1.2 m/min. The chromium-manganese-nickel-nitrogen austenitic stainless steel Rp0.2 is more than or equal to 450MPa, the tensile strength Rm is 750-900 MPa, and the elongation A50mm is more than or equal to 40%.
Description
Technical Field
The invention relates to the technical field of stainless steel production and manufacturing, in particular to chromium-manganese-nickel-nitrogen austenitic stainless steel and a manufacturing method thereof.
Background
In the last decade, the demand of stainless steel is rapidly increased along with the rapid development of Chinese economy, and nickel-saving austenitic stainless steel is rapidly developed and popularized. The nickel-saving austenitic stainless steel is a metastable austenitic stainless steel formed by partially or completely replacing noble metal nickel by manganese and nitrogen, has excellent machinability, comprehensive mechanical property and exquisite decoration, has good corrosion resistance, can be used in almost all fields of architectural decoration, tableware and kitchen ware, sanitary equipment and appliances, transportation equipment and parts and the like, and has very wide application fields. With the upgrading of consumption and the standardization of industry, new requirements are provided for the service performances of nickel-saving austenitic stainless steel, such as corrosion resistance, cold work hardening condition and the like.
The nickel-saving austenitic stainless steel in market circulation has low Cr content, generally higher Mn content, and pitting resistance equivalent PREN (pitting resistance equivalent, the higher the value is, the better the corrosion resistance) values which are all lower than 10; too high Mn content tends to reduce the plasticity and corrosion resistance of the material.
In summary, the following problems exist in the prior art: the corrosion resistance of stainless steel is insufficient.
Disclosure of Invention
The invention aims to solve the problem of insufficient corrosion resistance of stainless steel.
To this end, in one aspect, the invention proposes a method for manufacturing a chromium manganese nickel nitrogen austenitic stainless steel, said method comprising the following steps carried out in sequence:
smelting by charging ferronickel into a furnace AOD, continuously casting a plate blank, continuously rolling, annealing and pickling, cold rolling, bright annealing, inspecting, packaging and warehousing; the chromium-manganese-nickel-nitrogen austenitic stainless steel comprises the following chemical components in percentage by weight: 0.13-0.15 wt%, Si is less than or equal to 0.50wt%, Mn: 9.00-9.40 wt%, P is less than or equal to 0.050wt%, S is less than or equal to 0.005wt%, and Cr: 14.00-14.40 wt%, N: 0.177 wt%, 0.183wt%, 0.186wt%, or 0.188wt%, Cu: 0.25 to 0.35 wt%, Ni: 1.1-1.5 wt%, and the balance of Fe and inevitable trace elements.
In the slab continuous casting process, the pouring temperature of a tundish is 1500-1530 ℃, and the casting blank drawing speed is 1.0-1.2 m/min.
Specifically, the slab continuous casting adopts a full-process protection casting process, an alkaline covering agent is used for a tundish, and the fluctuation of the liquid level of a crystallizer is controlled to be +/-3 mm.
Specifically, in the hot continuous rolling, the soaking temperature of a casting blank is controlled to be 1200-1250 ℃, the furnace time is 180-200 min, the final rolling temperature is 980-1050 ℃, and the coiling temperature is 850-900 ℃.
Specifically, in the cold rolling process, the total reduction rate is more than 60%, and the pass reduction rates of the first two frames are 30-35%.
Specifically, a double-belt continuous muffle bright annealing furnace is adopted for annealing, the annealing temperature is 1000-1100 ℃, and the TV value is 7-10.
On the other hand, the invention provides the Cr-Mn-Ni-N austenitic stainless steel which comprises the following chemical components in percentage by weight: 0.13-0.15 wt%, Si is less than or equal to 0.50wt%, Mn: 9.00-9.40 wt%, P is less than or equal to 0.050wt%, S is less than or equal to 0.005wt%, and Cr: 14.00-14.40 wt%, N: 0.177 wt%, 0.183wt%, 0.186wt%, or 0.188wt%, Cu: 0.25 to 0.35 wt%, Ni: 1.1-1.5 wt%, and the balance of Fe and inevitable trace elements.
Specifically, the chromium-manganese-nickel-nitrogen austenitic stainless steel comprises the following chemical components in percentage by weight: 0.14wt%, Si: 0.30wt%, Mn: 9.30wt%, P: 0.032wt%, S: 0.004wt%, Ni: 1.16wt%, Cr: 14.30 wt%, Cu: 0.28 wt%, N: 0.183 wt%.
Specifically, the chromium-manganese-nickel-nitrogen austenitic stainless steel comprises the following chemical components in percentage by weight: 0.15wt%, Si: 0.44wt%, Mn: 9.11wt%, P: 0.032wt%, S: 0.003wt%, Ni: 1.20wt%, Cr: 14.06 wt%, Cu: 0.33 wt%, N: 0.186 wt%.
Specifically, the chromium-manganese-nickel-nitrogen austenitic stainless steel comprises the following chemical components in percentage by weight: 0.13wt%, Si: 0.50wt%, Mn: 9.40wt%, P: 0.034wt%, S: 0.004wt%, Ni: 1.14wt%, Cr: 14.40 wt%, Cu: 0.35 wt%, N: 0.177 wt%.
In particular, the thickness of the chromium-manganese-nickel-nitrogen austenitic stainless steel product is 0.4mm to 0.7 mm.
The invention realizes the stable production of the product by fully utilizing Mn and N alloying principles and adopting proper continuous casting and rolling annealing processes through the optimized design of components, and obtains the austenitic stainless steel with stable mechanical property, good pitting corrosion resistance, small cold work hardening, less deformation induced martensite and small aging cracking risk. The Cr-Mn-Ni-N austenitic stainless steel R obtained by the inventionp0.2Not less than 450MPa, tensile strength Rm750 to 900MPa, elongation A50mm≥40%。
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, there is provided a method of manufacturing a chromium manganese nickel nitrogen austenitic stainless steel, the method comprising the following steps performed in order:
smelting by charging ferronickel into a furnace AOD, continuously casting a plate blank, continuously rolling, annealing and pickling, cold rolling, bright annealing, inspecting, packaging and warehousing; the chromium-manganese-nickel-nitrogen austenitic stainless steel comprises the following chemical components in percentage by weight: 0.13-0.15 wt%, Si is less than or equal to 0.50wt%, Mn: 9.00-9.40 wt%, P is less than or equal to 0.050wt%, S is less than or equal to 0.005wt%, and Cr: 14.00-14.40 wt%, N: 0.177 wt%, 0.183wt%, 0.186wt%, or 0.188wt%, Cu: 0.25 to 0.35 wt%, Ni: 1.1-1.5 wt%, and the balance of Fe and inevitable trace elements.
In the slab continuous casting process, the pouring temperature of a tundish is 1500-1530 ℃, and the casting blank drawing speed is 1.0-1.2 m/min.
The slab continuous casting adopts a whole-process protective casting process, the casting temperature of a tundish is 1500-1530 ℃, the tundish uses an alkaline covering agent, the fluctuation of the liquid level of a crystallizer is controlled to be +/-3 mm, special covering slag is used, and the casting blank drawing speed is 1.0-1.2 m/min.
The high-precision continuous casting control process comprises the following steps: the casting process of 'weak cooling, low superheat degree, low pulling speed and high straightening temperature' is adopted, and the generation of bubbles and slab surface cracks is reduced.
The nickel-iron water comprises (by mass percent) C <2.0%, Ni < 1.6%, Cr: 3.26%, Si: 0.5-0.7%, P is less than or equal to 0.03%, and S is less than 0.28%.
The components and the temperature of the molten ferronickel entering the furnace for AOD smelting are shown in the following table (table 1), and the molten ferronickel and the scrap steel are fed into the furnace according to the required proportion. Alloy melting, oxidation decarburization, reduction and component fine adjustment are sequentially completed in an AOD furnace, and the tapping temperature is guaranteed to be 1620-. LF refining: heating molten steel in an LF furnace, stirring with argon, removing impurities, and homogenizing components and temperature;
table 1: condition of nickel-iron water
In the hot continuous rolling, the soaking temperature of a casting blank is controlled to be 1200-1250 ℃, the furnace time is 180-200 min, the final rolling temperature is 980-1050 ℃, and the coiling temperature is 850-900 ℃.
In the hot continuous rolling process, the soaking temperature of a casting blank is controlled to be 1200-1250 ℃, the furnace time is about 180-200 min, and the generation of high-temperature ferrite under long-time heating is avoided; the rough rolling adopts a four-stand hot continuous rolling mill, the finish rolling adopts a nine-stand hot continuous rolling mill, the finish rolling temperature is controlled to be 980-1050 ℃, and the coiling temperature is 850-900 ℃.
Annealing and pickling: the annealing temperature of the hot-rolled strip steel is 1000-1100 ℃, the annealing process speed is 15-20 m/min, and the hardness of the annealed strip steel is controlled at 92-96 HRB; the acid cleaning adopts a three-section type mixed acid cleaning process, and the concentration of the first-section acid solution and the second-section acid solution is respectively HF: 0 to 60g/L, H 2SO4：150～250g/L、HNO3: 90-150 g/L, acid liquor temperature 70-85 ℃, and HNO adopted in the third stage3Passivating, wherein the pickling temperature is 35-55 ℃; the pickling speed is less than or equal to 60 m/min; controlling the pH value of the alkali liquor in the neutralization tank to be 13-14; rinsing at the temperature of 70-80 ℃; the drying temperature is more than or equal to 80 ℃.
In the cold rolling process, the total reduction rate is more than 60%, and the pass reduction rates of the first two frames are 30-35%.
Cold rolling and annealing: the cold rolling adopts a 950mm six-stand continuous rolling mill or a single-stand rolling mill, the total reduction rate is controlled to be more than 60 percent, the pass reduction rates of the first two stands are controlled to be 30-35 percent, and the reduction amount is uniformly distributed in the rest passes, so that the generation of more deformation induced martensite is avoided; and annealing by adopting a double-belt continuous muffle bright annealing furnace, wherein the annealing temperature is 1000-1100 ℃, and the TV value is 7-10.
In an embodiment of the present invention, there is also provided a chromium-manganese-nickel-nitrogen austenitic stainless steel (or an austenitic stainless steel), where the chemical components of the chromium-manganese-nickel-nitrogen austenitic stainless steel are, by weight: 0.13-0.15 wt%, Si is less than or equal to 0.50wt%, Mn: 9.00-9.40 wt%, P is less than or equal to 0.050wt%, S is less than or equal to 0.005wt%, and Cr: 14.00-14.40 wt%, N: 0.177 wt%, 0.183wt%, 0.186wt%, or 0.188wt%, Cu: 0.25 to 0.35 wt%, Ni: 1.1-1.5 wt%, and the balance of Fe and inevitable trace elements.
Preferably, the chemical components of the chromium-manganese-nickel-nitrogen austenitic stainless steel in percentage by weight are C: 0.14wt%, Si: 0.30wt%, Mn: 9.30wt%, P: 0.032wt%, S: 0.004wt%, Ni: 1.16wt%, Cr: 14.30 wt%, Cu: 0.28 wt%, N: 0.183 wt%.
Preferably, the chemical components of the chromium-manganese-nickel-nitrogen austenitic stainless steel in percentage by weight are C: 0.15wt%, Si: 0.44wt%, Mn: 9.11wt%, P: 0.032wt%, S: 0.003wt%, Ni: 1.20wt%, Cr: 14.06 wt%, Cu: 0.33 wt%, N: 0.186 wt%.
Preferably, the chemical components of the chromium-manganese-nickel-nitrogen austenitic stainless steel in percentage by weight are C: 0.13wt%, Si: 0.50wt%, Mn: 9.40wt%, P: 0.034wt%, S: 0.004wt%, Ni: 1.14wt%, Cr: 14.40 wt%, Cu: 0.35 wt%, N: 0.177 wt%.
Preferably, the chemical components of the chromium-manganese-nickel-nitrogen austenitic stainless steel in percentage by weight are C: 0.14wt%, Si: 0.45wt%, Mn: 9.21wt%, P: 0.031wt%, S: 0.004wt%, Ni: 1.16wt%, Cr: 14.27 wt%, Cu: 0.33 wt%, N: 0.188 wt%.
The thickness of the chromium-manganese-nickel-nitrogen austenitic stainless steel product is 0.4mm to 0.7 mm.
The thickness of the chromium-manganese-nickel-nitrogen austenitic stainless steel plate (or the austenitic stainless steel plate) is 0.4 to 0.7 mm.
The invention realizes the stable production of the product by fully utilizing Mn and N alloying principles and adopting proper continuous casting and rolling annealing processes through the optimized design of components, and obtains the austenitic stainless steel with stable mechanical property, good pitting corrosion resistance or pitting corrosion resistance equivalent (PREN), small cold work hardening, less deformation induced martensite amount and small aging cracking risk. The Cr-Mn-Ni-N austenitic stainless steel R obtained by the inventionp0.2Not less than 450MPa, tensile strength Rm750 to 900MPa, elongation A50mm≥40%。
The production method of the chromium-manganese-nickel-nitrogen austenitic stainless steel adopts the following component proportion and specific process. Wherein, table 2 is the composition (in weight percent) of the steels of the respective examples. Table 3 shows the process parameters corresponding to the example steels described in table 2. Table 4 shows the mechanical properties of the steel compositions according to the examples of Table 2.
Table 2: chemical composition and index of product
Table 3: specific key process parameters of each embodiment
Table 4: mechanical properties of the austenitic stainless steels obtained in the examples
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is within the scope of the present invention that any person skilled in the art may make equivalent changes and modifications without departing from the spirit and principle of the present invention.
Claims (3)
1. A method for manufacturing a chromium-manganese-nickel-nitrogen austenitic stainless steel, characterized in that the method comprises the following steps carried out in sequence:
smelting by charging ferronickel into a furnace AOD, continuously casting a plate blank, continuously rolling, annealing and pickling, cold rolling and bright annealing; the chromium-manganese-nickel-nitrogen austenitic stainless steel comprises the following chemical components in percentage by weight: 0.13-0.15 wt%, Si is less than or equal to 0.50wt%, Mn: 9.11-9.40 wt%, P is less than or equal to 0.050wt%, S is less than or equal to 0.005wt%, and Cr: 14.00-14.40 wt%, N: 0.177 wt%, 0.183wt%, 0.186wt%, or 0.188wt%, Cu: 0.25 to 0.35 wt%, Ni: 1.1-1.5 wt%, and the balance of Fe and inevitable trace elements;
in the slab continuous casting process, the pouring temperature of a tundish is 1500-1530 ℃, and the casting blank pulling speed is 1.0-1.2 m/min;
the slab continuous casting adopts a whole-process protective casting process, an alkaline covering agent is used for a tundish, and the fluctuation of the liquid level of a crystallizer is controlled to be +/-3 mm;
annealing by adopting a double-belt continuous muffle bright annealing furnace, wherein the annealing temperature is 1000-1100 ℃, and the TV value is 7-10;
Cr-Mn-Ni-N austenitic stainless steel Rp0.2Not less than 450MPa, tensile strength RmThe elongation A of the austenitic stainless steel is 750-900 MPa, and the chromium, manganese, nickel and nitrogen50mm≥40%。
2. The manufacturing method of the Cr-Mn-Ni-N austenitic stainless steel as claimed in claim 1, wherein the soaking temperature of casting blank is controlled to be 1200-1250 ℃, the furnace time is 180-200 min, the final rolling temperature is 980-1050 ℃, and the coiling temperature is 850-900 ℃.
3. The method for manufacturing the Cr-Mn-Ni-N austenitic stainless steel as claimed in claim 1, wherein in the cold rolling process, the total reduction rate is more than 60%, and the reduction rates of the first two stand passes are 30-35%.
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| CN101724790A (en) * | 2008-10-23 | 2010-06-09 | 宝山钢铁股份有限公司 | Low-nickel austenitic stainless steel and manufacturing method thereof |
| CN112111691A (en) * | 2020-08-12 | 2020-12-22 | 广西柳钢中金不锈钢有限公司 | Copper-free nickel-saving cold-rolled austenitic stainless steel and manufacturing method thereof |
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| CN102337481B (en) * | 2010-07-20 | 2013-11-13 | 宝山钢铁股份有限公司 | Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof |
| CN102943219B (en) * | 2012-11-23 | 2014-08-06 | 四川金广技术开发有限公司 | Nickel-saving austenitic stainless steel containing manganese, nitrogen and boron and fabrication method |
| CN106834973B (en) * | 2016-12-28 | 2021-06-04 | 宝钢德盛不锈钢有限公司 | Economical high-strength austenitic stainless steel for railway vehicles and manufacturing method thereof |
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| CN112111691A (en) * | 2020-08-12 | 2020-12-22 | 广西柳钢中金不锈钢有限公司 | Copper-free nickel-saving cold-rolled austenitic stainless steel and manufacturing method thereof |
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