CN115181906A - Ultrapure ferrite stainless steel for high-corrosion-resistance water tank and production method thereof - Google Patents

Ultrapure ferrite stainless steel for high-corrosion-resistance water tank and production method thereof Download PDF

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Publication number
CN115181906A
CN115181906A CN202210783274.7A CN202210783274A CN115181906A CN 115181906 A CN115181906 A CN 115181906A CN 202210783274 A CN202210783274 A CN 202210783274A CN 115181906 A CN115181906 A CN 115181906A
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China
Prior art keywords
stainless steel
equal
percent
less
water tank
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CN202210783274.7A
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Inventor
谈宇亮
刘文华
徐向东
方剑锋
方健
崔庆君
孙器为
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Angang Lianzhong Guangzhou Stainless Steel Co ltd
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Angang Lianzhong Guangzhou Stainless Steel Co ltd
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Priority to CN202210783274.7A priority Critical patent/CN115181906A/en
Publication of CN115181906A publication Critical patent/CN115181906A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/086—Iron or steel solutions containing HF
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C25F1/02—Pickling; Descaling
    • C25F1/04—Pickling; Descaling in solution
    • C25F1/06—Iron or steel
    • 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

Abstract

The invention relates to a high corrosion resistance ultra-pure ferrite stainless steel for a water tank and a production method thereof, wherein the steel comprises the following chemical components in percentage by mass: less than or equal to 0.025 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.030 percent of S, 17.0 to 20.0 percent of Cr17, 1.75 to 2.50 percent of Mo1, less than or equal to 0.025 percent of N, less than or equal to 0.80 percent of 8 x (C + N) and less than or equal to (Ti + Nb), and the balance of Fe and inevitable impuritiesImpurity elements. The invention solves the problem of Cl which is easy to appear in a stainless steel water tank ﹣ The problem of pitting corrosion prolongs the service life of the water tank and reduces the manufacturing cost of the water tank.

Description

Ultrapure ferrite stainless steel for high-corrosion-resistance water tank and production method thereof
Technical Field
The invention relates to the technical field of stainless steel production, in particular to ultrapure ferrite stainless steel for a high-corrosion-resistance water tank and a production method thereof.
Background
In order to improve the comprehensive performance of the material and avoid the adverse effects of Cr carbide and nitride precipitation on the mechanical property and the corrosion resistance of the steel, the ferritic stainless steel develops towards the direction of low C and N at the present stage. The ultra-pure ferritic stainless steel belongs to a ferritic stainless steel, the content of C and N elements is extremely low (the sum of the mass fractions of C and N elements does not exceed 0.015 percent generally), and the ultra-pure ferritic stainless steel has medium and high Cr mass fraction.
The ultra-pure ferritic stainless steel does not contain nickel alloy, has lower alloy cost than 304 and 316 austenitic stainless steel, and can replace 304 and 316 steel in many fields. 304. Cl resistance of 316 austenitic stainless steel ﹣ The pitting corrosion performance is poor, and the 304 and 316 austenitic stainless steels often generate Cl when manufacturing water tanks and water pipes ﹣ The service life is shortened due to the problem of pitting corrosion. As a substitute for austenitic stainless steel, there is a need to develop a Cl-resistant alloy which is resistant to corrosion by atmospheric environment ﹣ An ultra-pure ferritic stainless steel excellent in pitting corrosion properties.
Disclosure of Invention
The invention provides an ultrapure ferrite stainless steel for a high-corrosion-resistance water tank and a production method thereof, which solve the problem that Cl is easy to appear in a stainless steel water tank ﹣ The pitting problem prolongs the service life of the water tank and reduces the manufacturing cost of the water tank at the same time.
In order to achieve the purpose, the invention adopts the following technical scheme:
the ultrapure ferrite stainless steel for the high-corrosion-resistance water tank comprises the following chemical components in percentage by mass: less than or equal to 0.025 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.030 percent of S, 17.0 to 20.0 percent of Cr, 1.75 to 2.50 percent of Mo, less than or equal to 0.025 percent of N, less than or equal to 0.80 percent of 8 x (C + N) (Ti + Nb), and the balance of Fe and inevitable impurity elements.
A production method of ultra-pure ferritic stainless steel for a high-corrosion-resistance water tank comprises the following steps:
1) Obtaining a black-skin steel coil after steel-making smelting, continuous casting and hot rolling and rolling;
2) Carrying out solid solution, sand blasting, re-brushing and acid pickling on the black strip coil to obtain a No.1 surface steel coil with the surface roughness Ra of less than or equal to 3.5 microns;
3) Carrying out reciprocating multi-pass cold deformation rolling processing on the No.1 surface steel coil to obtain a hard plate steel coil;
4) Rapidly heating the stainless steel band after the hard-state plate steel coil is uncoiled at 950-1100 ℃ for less than or equal to 5min; rapidly cooling the heated stainless steel band to room temperature by adopting a water cooling mode;
5) The stainless steel strip is subjected to solid solution, electrolysis, acid washing and quenching and tempering rolling processing to obtain a stainless steel product with a 2B surface.
In the step 2), 2 groups of heavy brush rollers are adopted to brush the surface of the steel belt in the heavy brushing process.
In the step 5), the steel strip is subjected to electrolytic treatment in a neutral electrolysis area, and the surface rusts are loosened by strong current.
In the step 5), the stainless steel strip is subjected to acid cleaning treatment on the surface through an acid mixing tank, wherein the concentration of HF in the acid mixing tank is 15-30 g/L, and HNO is contained in the acid mixing tank 3 The concentration is 150-250 g/L.
The microstructure of the stainless steel product with the 2B surface is single-phase ferrite.
Compared with the prior art, the invention has the beneficial effects that:
1) After the black skin is subjected to solid solution and sand blasting, 2 groups of heavy brush rolls are used for scrubbing the surface of the steel strip, and then mixed acid pickling is carried out to obtain the No.1 steel coil with lower surface roughness (Ra is less than or equal to 3.5 microns).
2) The NO.1 steel coil after being brushed and washed again is subjected to cold rolling, solid solution, neutral salt strong current electrolysis, HF concentration of 15-30 g/L and HNO 3 Carrying out surface acid washing treatment on a mixed acid tank with the concentration of 150-250 g/L, and carrying out quenching and tempering rolling to obtain a 2B surface,The microstructure is a single-phase ferritic stainless steel product.
Detailed Description
The invention relates to ultrapure ferrite stainless steel for a high-corrosion-resistance water tank, which comprises the following chemical components in percentage by mass: less than or equal to 0.025 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.030 percent of S, 17.0 to 20.0 percent of Cr, 1.75 to 2.50 percent of Mo, less than or equal to 0.025 percent of N, less than or equal to 0.80 percent of 8 x (C + N) and less than or equal to (Ti + Nb), and the balance of Fe and inevitable impurity elements.
A production method of ultra-pure ferritic stainless steel for a high-corrosion-resistance water tank comprises the following steps:
1) Obtaining a black-skin steel coil after steel-making smelting, continuous casting and hot rolling and rolling;
2) Carrying out solid solution, sand blasting, re-brushing and acid pickling on the black strip coil to obtain a No.1 surface steel coil with the surface roughness Ra of less than or equal to 3.5 microns;
3) No.1 surface steel coil is subjected to reciprocating multi-pass cold deformation rolling processing to obtain a hard plate steel coil;
4) Rapidly heating the stainless steel band after the hard-state plate steel coil is uncoiled at 950-1100 ℃ for less than or equal to 5min; rapidly cooling the heated stainless steel band to room temperature by adopting a water cooling mode;
5) The stainless steel strip is subjected to solid solution, electrolysis, acid washing and quenching and tempering rolling processing to obtain a stainless steel product with a 2B surface.
In the step 2), 2 groups of heavy brush rollers are adopted to brush the surface of the steel belt in the heavy brushing process.
In the step 5), the steel strip is subjected to electrolytic treatment in a neutral electrolysis area, and the surface rusts are loosened by strong current.
In the step 5), the surface of the stainless steel strip is subjected to acid cleaning treatment by an acid mixing tank, wherein the concentration of HF (hydrogen fluoride) in the acid mixing tank is 15-30 g/L, and HNO (hydrogen sulfide) is added 3 The concentration is 150-250 g/L.
The microstructure of the stainless steel product with the 2B surface is single-phase ferrite.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In the present example, the main chemical components of the ultrapure ferritic stainless steel for the high corrosion resistance water tank are shown in table 1.
Table 1 main chemical components in steel (mass%)
Examples C Si Mn P S Cr Mo N Ti+Nb Fe
1 0.011 0.44 0.29 0.032 0.001 18.9 1.90 0.014 0.28 Balance of
2 0.013 0.36 0.37 0.006 0.002 17.6 1.84 0.018 0.34 Allowance of
3 0.012 0.27 0.24 0.017 0.001 17.2 1.99 0.007 0.25 Balance of
4 0.006 0.22 0.28 0.025 0.003 17.5 2.36 0.011 0.29 Allowance of
5 0.017 0.35 0.44 0.008 0.001 17.8 2.27 0.015 0.36 Balance of
6 0.009 0.26 0.36 0.021 0.003 19.4 1.88 0.006 0.26 Balance of
In this example, the method for manufacturing the ultrapure ferritic stainless steel for the high corrosion resistance water tank was as follows:
1) Obtaining a black-skin steel coil after steelmaking smelting, continuous casting and hot rolling and rolling delay;
2) Carrying out solid solution, sand blasting, re-brushing and acid washing on the black strip coil to obtain a No.1 surface strip coil with the surface roughness Ra of less than or equal to 3.5 microns;
3) No.1 surface steel coil is subjected to reciprocating multi-pass cold deformation rolling processing to obtain a hard plate steel coil;
4) Rapidly heating the stainless steel band after the hard-state plate steel coil is uncoiled at 950-1100 ℃ for less than or equal to 5min; rapidly cooling the heated stainless steel band to room temperature by adopting a water cooling mode;
5) The stainless steel strip is subjected to solid solution, electrolysis, acid washing and quenching and tempering rolling processing to obtain a stainless steel product with a 2B surface.
The process parameters are shown in table 2.
TABLE 2 Process parameters
Figure BDA0003730601850000031
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The ultrapure ferrite stainless steel for the high-corrosion-resistance water tank is characterized by comprising the following chemical components in percentage by mass: less than or equal to 0.025 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.030 percent of S, 17.0 to 20.0 percent of Cr17, 1.75 to 2.50 percent of Mo1, less than or equal to 0.025 percent of N, less than or equal to 0.80 percent of 8 x (C + N) and less than or equal to (Ti + Nb), and the balance of Fe and inevitable impurity elements.
2. The method of producing an ultrapure ferritic stainless steel for a highly corrosion-resistant water tank according to claim 1, comprising the steps of:
1) Obtaining a black-skin steel coil after steelmaking smelting, continuous casting and hot rolling and rolling delay;
2) Carrying out solid solution, sand blasting, re-brushing and acid pickling on the black strip coil to obtain a No.1 surface steel coil with the surface roughness Ra of less than or equal to 3.5 microns;
3) Carrying out reciprocating multi-pass cold deformation rolling processing on the No.1 surface steel coil to obtain a hard plate steel coil;
4) Rapidly heating the stainless steel band after the hard-state plate steel coil is uncoiled at 950-1100 ℃ for less than or equal to 5min; rapidly cooling the heated stainless steel band to room temperature by adopting a water cooling mode;
5) The stainless steel strip is subjected to solid solution, electrolysis, acid washing and quenching and tempering rolling processing to obtain a stainless steel product with a 2B surface.
3. The method for producing an ultrapure ferritic stainless steel for a highly corrosion-resistant water tank according to claim 2, wherein in the step 2), the surface of the steel strip is brushed by 2 sets of heavy brush rollers.
4. The method for producing an ultrapure ferritic stainless steel for high corrosion resistance water tanks according to claim 2 wherein in step 5) the steel strip is subjected to electrolysis in a neutral electrolysis zone and the surface scale is loosened by high current.
5. The method for producing the ultrapure ferritic stainless steel for the highly corrosion-resistant water tank according to claim 2, wherein in the step 5), the surface of the stainless steel strip is subjected to acid pickling treatment by an acid mixing tank, wherein the concentration of HF and HNO in the acid mixing tank is 15-30 g/L 3 The concentration is 150-250 g/L.
6. The method of claim 2, wherein the microstructure of the stainless steel strip on the 2B surface is single-phase ferrite.
CN202210783274.7A 2022-07-05 2022-07-05 Ultrapure ferrite stainless steel for high-corrosion-resistance water tank and production method thereof Pending CN115181906A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102206791A (en) * 2010-03-29 2011-10-05 宝山钢铁股份有限公司 Mo-containing ferritic stainless steel and manufacturing method thereof
CN114058958A (en) * 2021-11-09 2022-02-18 鞍钢联众(广州)不锈钢有限公司 High-formability ultrapure ferrite stainless steel and continuous rolling production method thereof
CN114058972A (en) * 2021-11-09 2022-02-18 鞍钢联众(广州)不锈钢有限公司 High-deep-drawing-property ultrapure ferrite stainless steel and manufacturing method thereof
CN114107622A (en) * 2021-11-23 2022-03-01 鞍钢联众(广州)不锈钢有限公司 Production method of cold-rolled nickel-saving austenitic stainless steel 8K mirror surface
CN114645194A (en) * 2022-02-17 2022-06-21 宁波宝新不锈钢有限公司 Preparation method of high-corrosion-resistance ferritic stainless steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102206791A (en) * 2010-03-29 2011-10-05 宝山钢铁股份有限公司 Mo-containing ferritic stainless steel and manufacturing method thereof
CN114058958A (en) * 2021-11-09 2022-02-18 鞍钢联众(广州)不锈钢有限公司 High-formability ultrapure ferrite stainless steel and continuous rolling production method thereof
CN114058972A (en) * 2021-11-09 2022-02-18 鞍钢联众(广州)不锈钢有限公司 High-deep-drawing-property ultrapure ferrite stainless steel and manufacturing method thereof
CN114107622A (en) * 2021-11-23 2022-03-01 鞍钢联众(广州)不锈钢有限公司 Production method of cold-rolled nickel-saving austenitic stainless steel 8K mirror surface
CN114645194A (en) * 2022-02-17 2022-06-21 宁波宝新不锈钢有限公司 Preparation method of high-corrosion-resistance ferritic stainless steel

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