CN112323075A - Solid solution pickling process for S32750 super duplex stainless steel medium plate - Google Patents
Solid solution pickling process for S32750 super duplex stainless steel medium plate Download PDFInfo
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- CN112323075A CN112323075A CN202011038270.3A CN202011038270A CN112323075A CN 112323075 A CN112323075 A CN 112323075A CN 202011038270 A CN202011038270 A CN 202011038270A CN 112323075 A CN112323075 A CN 112323075A
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- Prior art keywords
- pickling
- stainless steel
- solution treatment
- blackboard
- solid solution
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
Abstract
The invention provides a solid solution pickling process for an S32750 super duplex stainless steel medium plate, belonging to the field of stainless steel pressure processing. The process mainly comprises the following steps: the method comprises the steps of performing direct acid washing on a blackboard; solid solution treatment is carried out; and thirdly, pickling the annealed plate. According to the invention, the S32750 blackboard is directly pickled, so that the problem of difficult pickling caused by internal oxidation of elements with strong affinity with O, such as Cr, Si and the like in the S32750 blackboard directly annealed steel plate is solved, and the produced board has good quality; by controlling the solution treatment temperature and the cooling speed, the gamma phase proportion of the S32750 steel is ensured to be 45-55%, and no harmful phases such as sigma are precipitated; by increasing the concentration of HF and enhancing shot blasting, the pickling efficiency is increased from 1m/min to 3-5m/min, and the pickling efficiency is doubled.
Description
Technical Field
The invention belongs to the technical field of stainless steel pressure processing, and particularly relates to a solid solution pickling process for an S32750 super duplex stainless steel medium plate.
Background
The duplex stainless steel is a kind of stainless steel whose ferrite phase and austenite phase in microstructure are nearly half of each other, and has the advantages of both austenite stainless steel and ferrite stainless steel, high strength and good corrosion resistance, so that it can be extensively used in the industrial fields of petrochemical industry, paper-making and marine engineering, etc. S32750 belongs to super duplex stainless steel, has pitting equivalent weight PREN more than 40, has good corrosion resistance and high mechanical property in harsh environments containing chlorides, acids and the like, and is a substitute material for 6Mo super austenitic stainless steel, titanium materials and glass fiber reinforced plastics.
At present, the S32750 super duplex stainless steel pickling process refers to the 2205 process for production, and because the Cr and Mo contents of S32750 steel are higher, compared with 2205, the production difficulty is higher, and the specific expression is as follows: (1) the S32750 steel has high Cr and Mo content and is more compact in oxidation, elements such as Cr, Si and the like in the steel plate with strong affinity with O are easy to generate internal oxidation to cause difficult pickling when the steel plate is directly annealed by a blackboard, the pickling efficiency is low, the pickling speed is lower than 1m/mim, and the whole plate surface is blackened; (2) s32750 is easy to precipitate sigma-phase-equal precipitated phases, the influence on mechanical property and corrosion resistance is large, and in addition, the performance of the duplex stainless steel is optimal when the proportion of two phases is controlled to be 45-55%, so that certain requirements are imposed on the solution treatment temperature and the cooling speed, the solution treatment temperature is higher than the temperature for precipitation of the sigma-phase-equal precipitated phases to ensure complete solution, and meanwhile, the solution treatment temperature cannot be too high, and the proportion of the two phases is ensured to be 45-55%; the cooling rate is kept from the region where the sigma phase precipitates.
Disclosure of Invention
The invention aims to provide a solid solution pickling process for an S32750 super duplex stainless steel medium plate, aiming at overcoming the defects or shortcomings in the prior art, and solving the problems that the pickling efficiency of the S32750 super duplex stainless steel medium plate is low and the whole plate surface is blackened, so that the gamma phase proportion of the S32750 super duplex stainless steel medium plate is 45-55%, and no sigma precipitated phase is precipitated.
In order to achieve the purpose, the invention adopts the technical scheme that the solid solution pickling process for the S32750 super duplex stainless steel medium plate mainly comprises the following steps:
direct pickling of blackboard
Cutting an S32750 duplex stainless steel blackboard into fixed length, directly pickling with mixed acid without annealing, wherein the mixed acid adopted in pickling is HF + HNO3Wherein, the mass concentration of HF is 55-70g/L, the mass concentration of HNO3 is 120-150g/L, the pickling temperature is 60-70 ℃, and the pickling speed is 3-5 m/min;
good solid solution treatment effect
Carrying out solution treatment on the acid-washed S32750 steel plate, wherein the solution treatment temperature is 1080 +/-10 ℃, the heating coefficient is 1.4min/mm, the heat preservation coefficient is 1.0min/mm, and quenching and straightening treatment are carried out after the solution treatment;
pickling of annealed sheet
Carrying out secondary pickling on the S32750 steel plate subjected to the solution treatment, wherein the pickling medium adopted in the secondary pickling is HF + HNO3Wherein the mass concentration of HF is 55-70g/L, the mass concentration of HNO3 is 120-150g/L, the pickling temperature is 60-70 ℃, and the pickling speed is 3-5 m/min.
Preferably, in an embodiment of the present invention, the first shot blasting process is performed before the acid mixing and pickling.
Preferably, in one embodiment of the invention, the medium used in the quenching in the second step is water, and the cooling water amount is 220-3The quenching speed is 0.1-0.4 m/s.
Preferably, in one embodiment of the invention, the step three is performed with secondary shot blasting treatment before the secondary acid washing, wherein the shot blasting current is 65-75A, and the blasting speed is 2000-.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the problem of difficult pickling caused by internal oxidation of elements such as Cr, Si and the like with strong affinity with O in the S32750 blackboard directly annealed steel plate is solved by directly pickling the S32750 blackboard, and the quality of the board surface is good;
2. by controlling the solution treatment temperature and the cooling speed, the gamma phase proportion of the S32750 steel is ensured to be 45-55%, and no harmful phases such as sigma phase are precipitated;
3. the continuous process of direct acid washing of the blackboard, solid solution treatment and acid washing of the annealed plate is adopted, shot blasting is enhanced by improving the concentration of HF, the acid washing efficiency is improved to 3-5m/min from the original 1m/min, and the acid washing efficiency is doubled.
Drawings
FIG. 1 is a metallographic structure of an annealed plate treated by a solution pickling process for an S32750 super duplex stainless steel medium plate according to an embodiment of the present invention, wherein white represents a γ phase and black represents an α phase;
FIG. 2 is a back-scattered electron image before and after the treatment of the S32750 super duplex stainless steel medium plate solution pickling process according to an embodiment of the present invention, wherein a is a black panel before the treatment, b is an annealed plate after the treatment, white represents a sigma phase, gray represents a gamma phase, and black represents an alpha phase.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to preferred embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
PREFERRED EMBODIMENTS
A solid solution pickling process for an S32750 super duplex stainless steel medium plate mainly comprises the following steps:
direct pickling of blackboard
Cutting an S32750 duplex stainless steel blackboard to length, performing annealing shot blasting treatment at a shot blasting current of 65-75A and a blasting speed of 2000-plus-2300 r/min, and then directly pickling with mixed acid, wherein the mixed acid adopted in pickling is HF + HNO3Wherein, the mass concentration of HF is 55-70g/L, the mass concentration of HNO3 is 120-150g/L, the pickling temperature is 60-70 ℃, and the pickling speed is 3-5 m/min;
good solid solution treatment effect
Carrying out solution treatment on the acid-washed S32750 steel plate, wherein the solution treatment temperature is 1080 +/-10 ℃, the heating coefficient is 1.4min/mm, the heat preservation coefficient is 1.0min/mm, and the solid solution position isAfter the treatment, quenching and straightening treatment are carried out, and the cooling water quantity adopted in the quenching process is 220-3H, the quenching speed is 0.1-0.4 m/s;
pickling of annealed sheet
Performing secondary shot blasting treatment on the S32750 steel plate subjected to the solution treatment at shot blasting current of 65-75A and at a blasting speed of 2000-plus 2300r/min, and then performing acid cleaning for the second time, wherein the acid cleaning medium adopted in the acid cleaning for the second time is HF + HNO3Wherein the mass concentration of HF is 55-70g/L, the mass concentration of HNO3 is 120-150g/L, the pickling temperature is 60-70 ℃, and the pickling speed is 3-5 m/min.
By adopting the processes of direct acid washing of the blackboard, solid solution treatment and acid washing of the annealed plate and measures of improving the concentration of HF and strengthening shot throwing, the quality of the acid-washed plate surface is good, the acid washing efficiency is improved to 3-5m/min from the original 1m/min, and the acid washing efficiency is doubled; as shown in FIGS. 1 and 2, the proportion of the gamma phase is 50 to 55%, and no harmful phases such as sigma phase are precipitated. It can be seen that compared with the original process for producing the S32750 steel plate by referring to the 2205 process, the method of the invention has more outstanding pickling efficiency and quality.
The above description is only a preferred embodiment of the present invention, and it is intended to explain the technical solutions of the present invention, and those skilled in the art can make routine modifications, equivalent substitutions, improvements, and the like within the spirit and principle of the present invention.
Claims (4)
1. A solid solution pickling process for an S32750 super duplex stainless steel medium plate is characterized by mainly comprising the following steps:
direct pickling of blackboard
Cutting an S32750 duplex stainless steel blackboard into fixed length, directly pickling with mixed acid without annealing, wherein the mixed acid adopted for pickling is HF + HNO3Wherein, the mass concentration of HF is 55-70g/L, the mass concentration of HNO3 is 120-150g/L, the pickling temperature is 60-70 ℃, and the pickling speed is 3-5 m/min;
good solid solution treatment effect
Carrying out solution treatment on the acid-washed S32750 steel plate, wherein the solution treatment temperature is 1080 +/-10 ℃, the heating coefficient is 1.4min/mm, the heat preservation coefficient is 1.0min/mm, and quenching and straightening treatment are carried out after the solution treatment;
pickling of annealed sheet
Carrying out secondary pickling on the S32750 steel plate subjected to the solution treatment by adopting a pickling medium of HF + HNO3Wherein the mass concentration of HF is 55-70g/L, the mass concentration of HNO3 is 120-150g/L, the pickling temperature is 60-70 ℃, and the pickling speed is 3-5 m/min.
2. The process according to claim 1, characterized in that: the method comprises the step of performing shot blasting treatment once before acid mixing and pickling.
3. The process according to claim 1, characterized in that: step two, the medium adopted for quenching is water, and the cooling water quantity is 220-3The quenching speed is 0.1-0.4 m/s.
4. The process according to claim 1, characterized in that: step three, performing secondary shot blasting treatment before the second acid washing, wherein the shot blasting current is 65-75A, and the blasting speed is 2000-plus 2300 r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011038270.3A CN112323075A (en) | 2020-09-28 | 2020-09-28 | Solid solution pickling process for S32750 super duplex stainless steel medium plate |
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| CN202011038270.3A CN112323075A (en) | 2020-09-28 | 2020-09-28 | Solid solution pickling process for S32750 super duplex stainless steel medium plate |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709477A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pickling of double-phase stainless steel coil |
| CN103526130A (en) * | 2013-10-23 | 2014-01-22 | 北京科技大学 | Processing method for direct cold rolling of two-phase stainless steel as-cast state billet steel after solid solution treatment |
| CN103710637A (en) * | 2013-12-26 | 2014-04-09 | 浙江德传管业有限公司 | Thin-wall super duplex stainless steel seamless tube and production technology thereof |
| CN105586600A (en) * | 2016-03-16 | 2016-05-18 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Duplex stainless steel cold rolling annealing and pickling process |
| CN108247292A (en) * | 2017-12-29 | 2018-07-06 | 浙江久立特材科技股份有限公司 | A kind of manufacturing method of super-duplex stainless steel Welding Thick Pipe |
| CN110923726A (en) * | 2019-11-13 | 2020-03-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Production process of high-quality stainless steel medium plate for nuclear |
-
2020
- 2020-09-28 CN CN202011038270.3A patent/CN112323075A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709477A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pickling of double-phase stainless steel coil |
| CN103526130A (en) * | 2013-10-23 | 2014-01-22 | 北京科技大学 | Processing method for direct cold rolling of two-phase stainless steel as-cast state billet steel after solid solution treatment |
| CN103710637A (en) * | 2013-12-26 | 2014-04-09 | 浙江德传管业有限公司 | Thin-wall super duplex stainless steel seamless tube and production technology thereof |
| CN105586600A (en) * | 2016-03-16 | 2016-05-18 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Duplex stainless steel cold rolling annealing and pickling process |
| CN108247292A (en) * | 2017-12-29 | 2018-07-06 | 浙江久立特材科技股份有限公司 | A kind of manufacturing method of super-duplex stainless steel Welding Thick Pipe |
| CN110923726A (en) * | 2019-11-13 | 2020-03-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Production process of high-quality stainless steel medium plate for nuclear |
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