CN110373615A - A kind of economical fine grain austenitic stainless steel and its manufacturing method - Google Patents
A kind of economical fine grain austenitic stainless steel and its manufacturing method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- 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
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C21D2211/001—Austenite
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Abstract
A kind of economical fine grain austenitic stainless steel and its manufacturing method, the steel chemical composition mass percent are as follows: C:0.01~0.03%, Si:0.1~0.70%, Mn:6.4~7.5%, Cr:16.0~17.5%, Ni:3.0~4.0%, N:0.10~0.20%, Cu:0.5~1.0%, V:0.1~0.5%, P≤0.040%, S≤0.03%, remaining is Fe and inevitable impurity；Above-mentioned constituent content must meet simultaneously: N%=(0.015~0.03) × Mn%；20.8% < Nieq< 21.8%.The crystal grain for the steel that the present invention is prepared is the fine austenite crystal grain of recrystallization, and crystal grain diameter reduces the ratio of defects after Precision Machinings such as photoetching and laser processing less than 5 μm, and substantially reduces production cost, is suitble to industrialized production.
Description
Technical field
The invention belongs to the Precision Machinings fields such as photoetching and laser processing, and in particular to a kind of economical fine grain austenite is not
Rust steel and its manufacturing method.
Background technique
Austenitic stainless steel is widely used in the precision parts of automobile and electronics industry, and photoetching and laser processing are its masters
The processing technology wanted.Common stainless steel is easy to produce rough surface after photoetching or laser processing or surface is etched
Because stress concentrates the defects of generating warpage after one half thickness.Research shows that: austenite is or not fine grain (crystal grain diameter is less than 5 μm)
Ratio of defects after rust steel retrofit substantially reduces.
Japanese Unexamined Patent Publication 2-173214 discloses a kind of method for preparing fine grain austenitic stainless steel, adjusts chemical component
It is mainly added to microelement Nb, is annealed after cold rolling at 500~850 DEG C, to obtain the tissue of fine grain, it is ensured that erosion
The slickness of facet.But recrystallization temperature is improved, simultaneously because cold rolling, annealing due to being added to Nb in industrialized production
The fluctuation of temperature, crystal grain cannot be recrystallized sufficiently, led to the non-recrystallization tissue for having more, influenced precision machined slickness.
Chinese patent CN107075632A discloses a kind of austenite stainless steel plate and its manufacturing method, and preparation is averaged
Crystal grain diameter less than 5.0 μm, but due to containing more valuableness alloying element nickel 4.5~10% and contain molybdenum 0.1~2.0% with
And the expensive metals element such as niobium 0.02~0.5%, and two cold rolling rolling processes are used in production technology, cause higher ingredient
Cost and process costs.
Chinese patent CN105256244A disclose a kind of high rigidity, high intensity and the Ultra-fine Grained stainless steel of resistance to spot corrosion and its
Preparation method, contains 7~9% Ni, and 1~3% Mo forms single austenite by hot pressed sintering, by subsequent
Heat treatment obtains hardness and reaches 400HV, tensile strength 900MPa, and resistance to corrosion is more than the stainless steel of 316L, but hot pressed sintering
Be not suitable for industrialized production.
Summary of the invention
The purpose of the present invention is to provide a kind of economical fine grain austenitic stainless steel and its manufacturing methods, keep steel finished product brilliant
Grain diameter reduces the ratio of defects after Precision Machinings such as photoetching and laser processing less than 5 μm, and substantially reduces production cost, is suitble to
Industrialized production.
In order to achieve the above objectives, the technical scheme is that
A kind of economical fine grain austenitic stainless steel, chemical component mass percent are as follows: C:0.01~0.03%, Si:
0.1~0.70%, Mn:6.4~7.5%, Cr:16.0~17.5%, Ni:3.0~4.0%, N:0.10~0.20%, Cu:0.5
~1.0%, V:0.1~0.5%, P≤0.040%, S≤0.03%, remaining is Fe and inevitable impurity；Above-mentioned element contains
Amount must simultaneously meet following relationship:
N%=(0.015~0.03) × Mn%,
20.8% < Nieq< 21.8%,
Nieq=Ni%+0.35 × Si%+0.5 × (Mn+Cu) %+0.65 × Cr%+12.6 × (C+N) %.
Further, the crystal grain of the economical fine grain austenitic stainless steel is the fine austenite crystal grain of recrystallization, crystal grain
Diameter is less than 5 μm.
The effect of each alloy element is as follows in austenitic stainless steel of the present invention:
C:C is a kind of interstitial element, and the intensity of steel is remarkably improved by solution strengthening, forms and stablizes austenite and expansion
Big austenitic area.But C forms Gao Ge's in conjunction with the Cr in steel after stopping for a long time within the scope of using 400~700 DEG C of temperature
Cr23C6Type carbide declines the corrosion resistance especially intergranular corrosion resistance performance of steel.Carbide also will cause retrofit simultaneously
Pollution in the process.Therefore, C content is controlled 0.01~0.03% in the present invention.
Si:Si is a kind of deoxidant element, is remarkably improved steel in the Susceptibility To Intergranular Corrosion and intensity of solid solution state.However Si
Precision machined etching speed is reduced when content is excessive.Therefore, the control of Si content is 0.1~0.70% in the present invention.
Mn:Mn is the element of strong stable austenite, and the intensity of steel can be improved and improve the thermoplasticity of steel.In order to make up
Nickel content reduces the reduction for leading to stabilization of austenite, appropriate to increase Mn content, and plays a part of to increase nitrogen solid solubility.Therefore,
The control of Mn content is 6.4~7.5% in the present invention.
Cr:Cr is to guarantee the corrosion proof essential element of stainless steel, is particularly improved in oxidative resistance medium and acid chlorization
Corrosion resistance in object medium, but excessive Cr causes the brittleness of stainless steel.Therefore, in the present invention control of Cr content for 16.0~
17.5%.
Ni:Ni is the element for forming and stablizing austenite strongly and expanding austenite phase field.With the increase of Ni content, steel
Strength reduction and plasticity improve, be conducive to cold machine-shaping performance, but Ni content is affected to manufacturing cost.Therefore, originally
The control of Ni content is 3.0~4.0%% in invention.
N:N is strong austenite former, avoids nickel content from reducing stabilization of austenite insufficient, while improving austenite not
The intensity and corrosion resistance of rust steel simultaneously refine crystal grain, but excessive N content can reduce the heat, cold-workability and cold formability of steel, and
And excessively high nitrogen content needs more alloying elements to be dissolved.Solubility of the N in molten steel is by elements such as nickel, manganese, molybdenum and chromium
Influence, because the present invention is free of molybdenum, and nickel and chromium are valuable alloying elements, in order to improve the solubility of nitrogen, must ensure N content
Meet: N%=(0.015~0.03) × Mn%.Therefore, N content control is 0.10~0.20% in the present invention, is met simultaneously
N%=(0.015~0.03) × Mn%.
Tissue is not influenced significantly when Cu:Cu content is less than 1%.In the present invention, Cu is mainly used to improve steel
Cold formability will not occur the mass defect that the influences such as edge crack use in cold-rolled process.Therefore, Cu content in the present invention
Control is 0.5~1.0%.
V:V can be formed V (C, N) in conjunction with C, N, and on the one hand the C in reduction matrix, N content, reduce austenite at room temperature
Stability, promote more austenites in cooling procedure to be changed into martensite, on the other hand as the nail in annealing after cold rolling
Tying point prevents crystal grain from growing up.But content is more than that the effect of 0.5%, V is unobvious, therefore, in the present invention V content control for 0.1~
0.5%.
P, S:P and S is inevitable impurity element, but has detrimental effect to performance, should be respectively smaller than 0.04%
With 0.03%.
Ni is controlled in present component systemeqIn 20.8~21.8% ranges, Ni is controlledeqBe greater than 20.8% in order to
Guarantee that slab cooling is to guarantee that certain cold roling reduction is rolled less than 21.8% to all existing at room temperature with austenite structure
There is at least 80% austenite to be changed into strain-induced martensite after system, strain-induced martensite is changed into fine grain in subsequent annealing process
Austenite, V (C, N) prevent crystal grain from growing up as pinning point.
The manufacturing method of economical fine grain austenitic stainless steel of the present invention, includes the following steps:
1) it smelts, cast
It smelted according to above-mentioned chemical component, be casting continuously to form slab；
2) it heats
The tapping temperature of slab is 1200~1400 DEG C, and total time inside furnace is 240~280 minutes；
3) hot rolling, cooling, batch
Slab hot rolling is to target thickness；After rolling through water cooling, batch, coiling temperature be 700~750 DEG C；It batches rear air-cooled；
4) solution treatment, pickling
Solid solution temperature is 1060~1100 DEG C；
5) cold rolling
Cold roling reduction > 60%, rolling temperature≤50 DEG C, single pass rolling reduction≤10%；
6) annealing after cold rolling, pickling
Annealing temperature after cold rolling is 900~1000 DEG C.
Further, in step 2), slab is sent in heating furnace and is heated, control the remaining oxygen in heating furnace less than 2%.
In step 2) of the present invention, continuous casting billet is sent in walking beam heating furnace and is heated, controls the air-fuel ratio in heating furnace,
Make the remaining oxygen in heating furnace less than 2%, obtains the good strip of surface quality after guaranteeing hot rolling.
In step 5), control cold roling reduction is greater than 60%, rolling temperature≤50 DEG C, drafts≤10% of single pass,
It is to promote more austenites to become strain-induced martensite, the crystal grain diameter after guaranteeing annealing is less than 5 μm.
The present invention is 900~1000 DEG C in the control of annealing after cold rolling temperature, it can be ensured that the strain-induced martensite generated in cold rolling
The austenite for becoming fine grain is all reversed, annealing after cold rolling temperature is too low, and strain-induced martensite changes insufficient, temperature to austenite
Du Taigao, the austenite after transformation are easy to grow up.
Yield strength >=598MPa of austenitic stainless steel produced by the present invention, tensile strength >=850MPa, elongation percentage >=
28, crystal grain diameter is less than 5 μm, and therefore, austenitic stainless steel crystal grain diameter of the present invention has high-intensitive and excellent less than 5 μm
Good plasticity.
Beneficial effects of the present invention:
The present invention reduces the content of expensive metal Ni in ingredient design by Mn, N alloying, and specifically increase Mn contains
Amount, N content and control N%=(0.015~0.03) × Mn% come avoid nickel content reduction cause stabilization of austenite to reduce, from
And cost of alloy is significantly reduced, 3000 yuan or so of ton steel escapable cost, but still ensure that stabilization of austenite；Add micro member
Plain V to promote more austenites to be changed into martensite in cooling procedure guarantees that the fine grain austenite being deformed into is reversed to exist
It is not easy to grow up in annealing process；By controlling NieqIn 20.8~21.8% ranges, guarantee most of austenite transformation after cold rolling
It is the basis for obtaining fine grain austenite at strain-induced martensite.
The present invention designs the cold-rolling process that drafts is greater than 60% in terms of manufacturing process, to promote more austenites to become
For strain-induced martensite, strain-induced martensite is changed into fine grain austenite in subsequent annealing process, and the crystal grain after guaranteeing annealing is straight
Diameter is less than 5 μm.Meanwhile 1 cold rolling rolling process is only needed in manufacturing process, a rolling process can be saved (including cold rolling and annealing)
Process costs (1500 yuan or so/ton steel), substantially reduce process costs, are suitble to industrialized production.
Detailed description of the invention
Fig. 1 is the micrograph of 1 steel of the embodiment of the present invention.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described.
Embodiment 1
Molten steel through electric furnace and AOD furnace smelting is poured into baked ladle, refining station microalloying, casting are hung to
Preceding chemical component is as shown in table 1, and the soft stirring of BOTTOM ARGON BLOWING makes field trash sufficiently float in 5 minutes, through continuous casting at continuous casting billet.
Continuous casting billet is sent in walking beam heating furnace and is heated, controls the remaining oxygen in heating furnace less than 2%, slab goes out
Furnace temperature is 1230 DEG C, and total time inside furnace is 240 minutes.
After continuous casting billet hot rolling to target thickness 3.0mm, water cooling is batched, and coiling temperature is 700 DEG C, is batched rear air-cooled；
Pickling is to white skin state after 1080 DEG C of solution treatment, the cold rolling through 60% drafts totally 11 passages, drafts per pass with
And rolling temperature is as shown in table 2, is rolled down to 1.2mm after annealing pickling, annealing temperature is 1000 DEG C.Preparing crystal grain diameter is
2.0~4.0 μm of economical austenitic stainless steel.
Embodiment 2
Molten steel through electric furnace and AOD furnace smelting is poured into baked ladle, refining station microalloying, casting are hung to
Preceding chemical component is as shown in table 1, and the soft stirring of BOTTOM ARGON BLOWING makes field trash sufficiently float in 10 minutes, through continuous casting at continuous casting billet.
Continuous casting billet is sent in walking beam heating furnace and is heated, controls the remaining oxygen in heating furnace less than 2%, slab goes out
Furnace temperature is 1240 DEG C, and total time inside furnace is 240 minutes.
After continuous casting billet hot rolling to target thickness 3.0mm, water cooling is batched, and coiling temperature is 750 DEG C, is batched rear air-cooled；
Pickling is to white skin state after 1080 DEG C of solution treatment, the cold rolling through 67.8% drafts totally 13 passages, drafts per pass
And rolling temperature is as shown in table 3, is rolled down to 1.0mm after annealing pickling, annealing temperature is 900 DEG C.Preparing crystal grain diameter is
1.0~3.0 μm of economical austenitic stainless steel.
Embodiment 3
Molten steel through electric furnace and AOD furnace smelting is poured into baked ladle, refining station microalloying, casting are hung to
Preceding chemical component is as shown in table 1, and the soft stirring of BOTTOM ARGON BLOWING makes field trash sufficiently float in 15 minutes, through continuous casting at continuous casting billet.
Continuous casting billet is sent in walking beam heating furnace and is heated, controls the remaining oxygen in heating furnace less than 2%, slab goes out
Furnace temperature is 1225 DEG C, and total time inside furnace is 280 minutes.
After continuous casting billet hot rolling to target thickness 2.8mm, water cooling is batched, and coiling temperature is 720 DEG C, is batched rear air-cooled；
Pickling is to white skin state after 1060 DEG C of solution treatment, the cold rolling through 71.4% drafts totally 13 passages, drafts per pass
And rolling temperature is as shown in table 4, is rolled down to 0.8mm after annealing pickling, annealing temperature is 950 DEG C.Preparing crystal grain diameter is
1.0~3.0 μm of economical austenitic stainless steel.
Embodiment 4
Molten steel through electric furnace and AOD furnace smelting is poured into baked ladle, refining station microalloying, casting are hung to
Preceding chemical component is as shown in table 1, and the soft stirring of BOTTOM ARGON BLOWING makes field trash sufficiently float in 8 minutes, through continuous casting at continuous casting billet.
Continuous casting billet is sent in walking beam heating furnace and is heated, controls the remaining oxygen in heating furnace less than 2%, slab goes out
Furnace temperature is 1235 DEG C, and total time inside furnace is 275 minutes.
After continuous casting billet hot rolling to target thickness 4.0mm, water cooling is batched, and coiling temperature is 735 DEG C, is batched rear air-cooled；
Pickling is to white skin state after 1100 DEG C of solution treatment, the cold rolling through 90% drafts totally 15 passages, drafts per pass with
And rolling temperature is as shown in table 5, is rolled down to 1.5mm after annealing pickling, annealing temperature is 900 DEG C.Preparing crystal grain diameter is 2.0
~4.0 μm of economical austenitic stainless steel.
Embodiment 5
Molten steel through electric furnace and AOD furnace smelting is poured into baked ladle, refining station microalloying, casting are hung to
Preceding chemical component is as shown in table 1, and the soft stirring of BOTTOM ARGON BLOWING makes field trash sufficiently float in 10 minutes, through continuous casting at continuous casting billet.
Continuous casting billet is sent in walking beam heating furnace and is heated, controls the remaining oxygen in heating furnace less than 2%, slab goes out
Furnace temperature is 1240 DEG C, and total time inside furnace is 240 minutes.
After continuous casting billet hot rolling to target thickness 3.2mm, water cooling is batched, and coiling temperature is 750 DEG C, is batched rear air-cooled；
Pickling is to white skin state after 1090 DEG C of annealing, the cold rolling through 85% drafts totally 13 passages, drafts per pass and rolls
Temperature processed is as shown in table 6, is rolled down to 1.0mm after annealing pickling, and annealing temperature is 930 DEG C.Prepare crystal grain diameter be 1.0~
3.0 μm of economical austenitic stainless steel.
As shown in Figure 1, the crystal grain of austenitic stainless steel produced by the present invention is the fine austenite crystal grain of recrystallization, brilliant
Grain diameter is 2~4 μm.
Table 7 is the performance and crystal grain diameter result of embodiment and comparative example steel.As shown in Table 7, the austenite stainless of manufacture
Yield strength >=598MPa of steel, tensile strength >=850MPa, elongation percentage >=28, crystal grain diameter size≤4 μm, therefore, this
Invention austenitic stainless steel crystal grain diameter≤4 μm, while there is high-intensitive and excellent plasticity.
1 unit of table: mass percent
| C | Si | Mn | P | S | Cr | Ni | N | Cu | V | Nieq | |
| Embodiment 1 | 0.018 | 0.2 | 6.5 | 0.028 | 0.002 | 16 | 4.3 | 0.18 | 0.6 | 0.1 | 20.81 |
| Embodiment 2 | 0.02 | 0.45 | 7.0 | 0.028 | 0.002 | 16.3 | 4.0 | 0.18 | 0.7 | 0.3 | 21.12 |
| Embodiment 3 | 0.023 | 0.6 | 7.2 | 0.027 | 0.003 | 17 | 3.5 | 0.20 | 1.0 | 0.2 | 21.67 |
| Embodiment 4 | 0.025 | 0.3 | 7.15 | 0.03 | 0.001 | 17.5 | 4.2 | 0.16 | 0.6 | 0.3 | 21.78 |
| Embodiment 5 | 0.03 | 0.7 | 7.5 | 0.03 | 0.001 | 16.8 | 4.1 | 0.10 | 0.5 | 0.5 | 20.90 |
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Claims (5)
1. a kind of economical fine grain austenitic stainless steel, chemical component mass percent are as follows: C:0.01~0.03%, Si:0.1
~0.70%, Mn:6.4~7.5%, Cr:16.0~17.5%, Ni:3.0~4.0%, N:0.10~0.20%, Cu:0.5~
1.0%, V:0.1~0.5%, P≤0.040%, S≤0.03%, remaining is Fe and inevitable impurity；Above-mentioned constituent content
It must simultaneously meet following relationship:
N%=(0.015~0.03) × Mn%；
20.8% < Nieq< 21.8%,
Nieq=Ni%+0.35 × Si%+0.5 × (Mn+Cu) %+0.65 × Cr%+12.6 × (C+N) %.
2. economical fine grain austenitic stainless steel according to claim 1, which is characterized in that the economical fine grain austenite
The crystal grain of stainless steel is the fine austenite crystal grain of recrystallization, and crystal grain diameter is less than 5 μm.
3. the manufacturing method of economical fine grain austenitic stainless steel according to claim 1 or claim 2, includes the following steps:
1) it smelts, cast
It smelted according to chemical component described in claim 1, be cast as slab；
2) it heats
Tapping temperature is 1200~1400 DEG C, and total time inside furnace is 240~280min；
3) hot rolling, cooling, batch
Slab hot rolling is to target thickness；After rolling through water cooling, batch, coiling temperature be 700~750 DEG C；
It batches rear air-cooled；
4) solution treatment, pickling
Solid solution temperature is 1060~1100 DEG C；
5) cold rolling
Cold roling reduction > 60%, rolling temperature≤50 DEG C, single pass rolling reduction≤10%；
6) annealing after cold rolling, pickling
Annealing temperature after cold rolling is 900~1000 DEG C.
4. the manufacturing method of economical fine grain austenitic stainless steel according to claim 3, which is characterized in that step 2)
In, slab is sent in heating furnace and is heated, controls the remaining oxygen in heating furnace less than 2%.
5. the manufacturing method of economical fine grain austenitic stainless steel according to claim 3 or 4, which is characterized in that described
The crystal grain of economical fine grain austenitic stainless steel is the fine austenite crystal grain of recrystallization, and crystal grain diameter is less than 5 μm.
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| CN112226686A (en) * | 2020-09-29 | 2021-01-15 | 鞍钢联众(广州)不锈钢有限公司 | Stainless steel plate for ore sieve sheet and manufacturing method thereof |
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