CN111604786A - Acid pickling process for stainless steel hot-rolled strip steel - Google Patents
Acid pickling process for stainless steel hot-rolled strip steel Download PDFInfo
- Publication number
- CN111604786A CN111604786A CN202010321753.8A CN202010321753A CN111604786A CN 111604786 A CN111604786 A CN 111604786A CN 202010321753 A CN202010321753 A CN 202010321753A CN 111604786 A CN111604786 A CN 111604786A
- Authority
- CN
- China
- Prior art keywords
- hydrochloric acid
- acid pickling
- rolled strip
- controlled
- strip steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a pickling process of stainless steel hot-rolled strip steel, which comprises the following steps: descaling pretreatment of a descaling unit, wherein the total elongation of the strip steel is controlled to be more than or equal to 3.0 percent; the first-stage hydrochloric acid pickling, namely soaking the strip steel into a first-stage hydrochloric acid pickling solution to perform first-stage hydrochloric acid pickling, wherein the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is controlled to be 50-300 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 60-80 ℃, and the pickling time is controlled to be 25-50 s; a second-stage hydrochloric acid pickling, wherein the strip steel is immersed into a second-stage hydrochloric acid pickling solution to carry out second-stage hydrochloric acid pickling, the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is controlled to be 50-250 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 50-75 ℃, and the pickling time is controlled to be 25-50 s; and (3) grinding and brushing, wherein the diameter of the bristles of the roller brush is controlled to be 0.7-1 mm, the bristles contain 170-200 meshes of silicon carbide abrasive, the rotating speed of a motor of the roller brush is controlled to be 600-1000 rpm, and the current of the motor of the roller brush is controlled to be 100-200A.
Description
Technical Field
The invention relates to the technical field of hot-rolled stainless steel production. More particularly, the invention relates to a pickling process of stainless steel hot-rolled strip steel.
Background
The production of stainless steel plates and strips is carried out by continuous casting, hot rolling, annealing and other procedures, and due to the influence of high temperature and oxidizing atmosphere, black iron oxide scale which is continuous, compact and strong in adhesive force with a matrix is generated on the surface of the stainless steel. From the steel rolling perspective, if the strip steel with the iron oxide scale is directly sent to a cold rolling mill for rolling, a plurality of problems can be caused, firstly, the rolling is carried out under the condition of large reduction, the iron oxide scale can be pressed into the matrix of the strip steel, the surface quality and the processing performance of the cold rolled strip are influenced, and even waste products are caused; secondly, the emulsified liquid system of the cooling and lubricating roller after the ferric oxide scale is crushed damages the circulating equipment, and the service life of the emulsified liquid is shortened; and the cold roll which has high surface smoothness and machining precision and is expensive is damaged. Therefore, the surface of the strip must be cleaned of scale before cold rolling to ensure the surface quality of the cold rolled strip produced.
The pickling of stainless steel hot rolled strip steel generally adopts shot blasting, sulfuric acid pickling and mixed acid (HNO)3+ HF) acid cleaning process, shot blasting is to use the centrifugal force of shot blasting to hit the descaling medium on the surface of the steel plate at a certain speed, and to remove the stainless steel surface oxidation layer by a large impact force, the descaling effect is good but the surface roughness is high, resulting in poor surface quality of the subsequent stainless steel cold plate, and the shot blasting machine has high investment once, large consumption of the shot blasting medium, and high maintenance and operation cost. A large amount of solid waste generated by the discharge of the sulfuric acid pickling waste acid is mostly accumulated to be treated, a large amount of land is occupied, secondary pollution of soil and underground water is caused, acid mud generated in the pickling process is easily deposited in a pipeline and a circulating tank of a circulating system, the circulation of acid liquor is influenced, frequent parking maintenance is needed, and the production efficiency is reduced. The mixed acid pickling process containing nitric acid generates a large amount of highly polluted NOxGas and nitrate-containing wastewater bring serious harm to natural environment and human production activities, and the purification cost of nitrogen oxides and the treatment cost of nitrate-containing wastewater are also higher.
Therefore, it is an urgent technical problem to be solved by the technical personnel in the field to develop a novel stainless steel hot-rolled strip steel pickling process to reduce the surface roughness and the investment and operation cost of the strip steel, simultaneously reduce the emission of solid waste and the shutdown maintenance times, and avoid the generation of high-pollution nitrogen oxide and nitrogen-containing wastewater during pickling with nitric acid-containing mixed acid, thereby reducing the environmental pollution.
Disclosure of Invention
In order to solve the technical problem, the invention provides a pickling process of stainless steel hot-rolled strip steel, which comprises the following steps:
a descaling pretreatment step of a descaling unit, wherein the stainless steel hot-rolled strip steel is subjected to descaling pretreatment through the descaling unit, and the total elongation of the stainless steel hot-rolled strip steel is controlled to be more than or equal to 3.0%;
a first-stage hydrochloric acid pickling step, namely soaking the stainless steel hot-rolled strip steel subjected to descaling pretreatment into a first-stage hydrochloric acid pickling solution to perform first-stage hydrochloric acid pickling, wherein the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is controlled to be 50-300 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 60-80 ℃, and the first-stage hydrochloric acid pickling time is controlled to be 25-50 s;
a second hydrochloric acid pickling step, namely soaking the stainless steel hot-rolled strip steel subjected to the first hydrochloric acid pickling into a second hydrochloric acid pickling solution to perform second hydrochloric acid pickling, wherein the hydrochloric acid concentration of the second hydrochloric acid pickling solution is controlled to be 50-250 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 50-75 ℃, and the second hydrochloric acid pickling time is controlled to be 25-50 s;
and a grinding and brushing step, wherein the stainless steel hot rolled strip steel subjected to the second-stage hydrochloric acid pickling is ground and brushed, the diameter of brush bristles of a roller brush used for grinding and brushing is controlled to be 0.7-1 mm, the brush bristles contain silicon carbide abrasive, the mesh number of the silicon carbide abrasive is 170-200 meshes, the rotating speed of a roller brush motor is controlled to be 600-1000 rpm, and the current of the roller brush motor is controlled to be 100-200A.
As a specific embodiment, in the pickling process of the hot-rolled stainless steel strip, the hot-rolled stainless steel strip is a low-medium chromium 400-series hot-rolled stainless steel strip containing Cr less than or equal to 18% and containing no Mo, such as 430 ferritic stainless steel hot-rolled strip, 441 ferritic stainless steel hot-rolled strip, and 4Cr13 martensitic stainless steel hot-rolled strip.
As a specific embodiment, in the pickling process of the stainless hot-rolled strip, the stainless hot-rolled strip is 430 ferritic stainless hot-rolled strip; in the descaling pretreatment step of the descaling unit, the total elongation of the 430 ferrite stainless steel hot-rolled strip steel is controlled to be 4.5 percent; in the first-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is 185g/L, the iron ion concentration is 20g/L, the temperature is 70 ℃, and the first-stage hydrochloric acid pickling time is 30 s; in the second-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 160g/L, the iron ion concentration is 12g/L, the temperature is 65 ℃, and the second-stage hydrochloric acid pickling time is 30 s; in the grinding and brushing step, the diameter of the brush hair of the roller brush is 1mm, the brush hair contains 180 meshes of silicon carbide abrasive, the rotating speed of a motor of the roller brush is 700rpm, and the current of the motor of the roller brush is 175A.
As a specific embodiment, in the above-described acid pickling process of the hot-rolled stainless steel strip, the hot-rolled stainless steel strip is a 441 ferritic hot-rolled stainless steel strip; in the descaling pretreatment step of the descaling unit, the total elongation of the 441 ferritic stainless steel hot-rolled strip steel is controlled to be 7 percent; in the first-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is 220g/L, the iron ion concentration is 18g/L, the temperature is 75 ℃, and the first-stage hydrochloric acid pickling time is 48 s; in the second-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 190g/L, the iron ion concentration is 10g/L, the temperature is 70 ℃, and the second-stage hydrochloric acid pickling time is 48 s; in the grinding and brushing step, the diameter of the brush hair of the roller brush is 1mm, the brush hair contains 180 meshes of silicon carbide abrasive, the rotating speed of a motor of the roller brush is 800rpm, and the current of the motor of the roller brush is 180A.
As a specific embodiment, in the pickling process of the hot-rolled stainless steel strip, the hot-rolled stainless steel strip is a hot-rolled 4Cr13 martensitic stainless steel strip; in the descaling pretreatment step of the descaling unit, the total elongation of the 4Cr13 martensitic stainless steel hot-rolled strip steel is controlled to be 4%; in the first-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is 100g/L, the iron ion concentration is 15g/L, the temperature is 65 ℃, and the first-stage hydrochloric acid pickling time is 30 s; in the second-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 80g/L, the iron ion concentration is 12g/L, the temperature is 55 ℃, and the second-stage hydrochloric acid pickling time is 30 s; in the grinding and brushing step, the diameter of the brush hair of the roller brush is 1mm, the brush hair contains 180 meshes of silicon carbide abrasive, the rotating speed of a motor of the roller brush is 700rpm, and the current of the motor of the roller brush is 175A.
The pickling process of the stainless steel hot-rolled strip steel adopts a descaling machine set descaling process, a two-stage hydrochloric acid pickling process and a grinding and scrubbing process, has a good pickling effect, can gradually remove oxide skin and a chromium-poor layer on the surface of the stainless steel hot-rolled strip steel, and reduces the surface roughness Ra of the stainless steel hot-rolled strip steel from 3.5-4.5 mu m to 1.0-2.0 mu m, so that the subsequent cold-rolled strip steel can obtain good surface quality.
The stainless steel hot-rolled strip steel pickling process adopts the descaling unit to carry out descaling pretreatment, so that the surface roughness, the investment and the operation cost of the stainless steel hot-rolled strip steel can be reduced, and the subsequent cold-rolled strip steel can obtain good surface quality; the acid washing process of the stainless steel hot rolled strip steel does not use sulfuric acid, so that the discharge of solid waste and the generation of acid mud are reduced, the problems of difficult stacking of the solid waste and secondary environmental pollution caused by the difficult stacking of the solid waste are solved, the shutdown maintenance frequency in acid washing production is reduced, and the production efficiency is improved; the pickling process of the stainless steel hot-rolled strip steel does not involve mixed acid (HNO)3+ HF), thus avoid producing high polluting nitrogen oxide and nitrogenous waste water, reduce production cost and waste water treatment cost, has lightened the environmental pollution; the stainless steel hot rolled strip steel pickling process adopts two-stage hydrochloric acid pickling, namely the first-stage hydrochloric acid pickling and the second-stage hydrochloric acid pickling, and reasonably controls the hydrochloric acid concentration and the iron ion concentration of the hydrochloric acid pickling solution and the temperature of the hydrochloric acid pickling solution, so that the pickling time of the stainless steel hot rolled strip steel is shortened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of the pickling process of the stainless hot-rolled strip steel of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the pickling process of the stainless steel hot-rolled strip steel of the present invention generally includes a descaling pre-treatment step of a descaling machine set, a first-stage hydrochloric acid pickling step, a second-stage hydrochloric acid pickling step, and a grinding and scrubbing step, wherein:
(1) in the descaling pretreatment step of the descaling unit, the stainless steel hot-rolled strip passes through the descaling unit, the total elongation of the stainless steel hot-rolled strip is controlled to be more than or equal to 3.0%, and the descaling pretreatment is carried out on the stainless steel hot-rolled strip;
(2) in the first-stage hydrochloric acid pickling step, soaking the stainless steel hot-rolled strip steel subjected to descaling pretreatment into a first-stage hydrochloric acid pickling solution for pickling, wherein the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is controlled to be 50-300 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 60-80 ℃, and the first-stage hydrochloric acid pickling time is controlled to be 25-50 s;
(3) in the second hydrochloric acid pickling step, the stainless steel hot-rolled strip steel subjected to the first hydrochloric acid pickling is immersed into a second hydrochloric acid pickling solution for pickling, the hydrochloric acid concentration of the second hydrochloric acid pickling solution is controlled to be 50-250 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 50-75 ℃, and the second hydrochloric acid pickling time is controlled to be 25-50 s;
(4) in the grinding and brushing step, the stainless steel hot rolled strip steel subjected to the second-stage hydrochloric acid pickling is ground and brushed, the diameter of brush bristles of a roller brush used for grinding and brushing is controlled to be 0.7-1 mm, the mesh number of silicon carbide grinding materials contained in the brush bristles is 170-200 meshes, the rotating speed of a roller brush motor is controlled to be 600-1000 rpm, and the current of the roller brush motor is controlled to be 100-200A.
As a specific implementation mode, the stainless steel hot-rolled strip steel to be treated in the acid pickling process of the stainless steel hot-rolled strip steel is medium-low chromium stainless steel hot-rolled strip steel. As used herein, the term "low-chromium stainless hot rolled strip" refers to a hot rolled strip of stainless steel containing Cr.ltoreq.18% and containing no Mo.
The acid cleaning process of the medium-low chromium stainless steel hot-rolled strip steel is described in the following with reference to specific embodiments.
Example 1
The strip steel to be treated by the high-surface environment-friendly pickling process for the stainless steel hot-rolled strip steel in the embodiment 1 is 430 ferrite stainless steel hot-rolled strip steel, the thickness of the strip steel is 3.0mm, and the process comprises the following steps of:
(1) the 430 ferrite stainless steel hot rolled strip steel enters the scale breaking units connected in series from the inlet section through the inlet loop, the total elongation is controlled to be 4.5%, and the scale removing pretreatment is carried out;
(2) soaking 430 ferrite stainless steel hot-rolled strip steel subjected to descaling pretreatment into a first section of hydrochloric acid pickling solution to perform first section hydrochloric acid pickling, wherein the hydrochloric acid concentration of the first section of hydrochloric acid pickling solution is 185g/L, the iron ion concentration is 20g/L, the temperature is 70 ℃, and the first section of hydrochloric acid pickling time is 30 s;
(3) immersing the 430 ferrite stainless steel hot-rolled strip steel subjected to the first-stage hydrochloric acid pickling into a second-stage hydrochloric acid pickling solution for second-stage hydrochloric acid pickling, wherein the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 160g/L, the iron ion concentration is 12g/L, the temperature is 65 ℃, and the second-stage hydrochloric acid pickling time is 30 s;
(4) and grinding and brushing the 430 ferrite stainless steel hot rolled strip steel subjected to the second section of hydrochloric acid pickling, wherein the diameter of brush bristles of a roller brush adopted by the grinding and brushing is 1mm, the brush bristles contain silicon carbide grinding materials with 180 meshes, the rotating speed of a roller brush motor is set to 700rpm, and the current of the roller brush motor is set to 175A.
Example 2
The strip steel to be treated by the high-surface environment-friendly pickling process for the stainless steel hot-rolled strip steel of the embodiment 2 is 441 ferrite stainless steel hot-rolled strip steel, the thickness of which is 3.5mm, and the process comprises the following steps of:
(1) the 441 ferritic stainless steel hot-rolled strip steel enters a scale breaking unit connected in series from an inlet section through an inlet loop, the total elongation is controlled to be 7%, and descaling pretreatment is carried out;
(2) soaking 441 ferrite stainless steel hot-rolled strip steel subjected to descaling pretreatment into a first-stage hydrochloric acid pickling solution for first-stage hydrochloric acid pickling, wherein the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is 220g/L, the iron ion concentration is 18g/L, the temperature is 75 ℃, and the first-stage hydrochloric acid pickling time is 48 s;
(3) immersing 441 ferrite stainless steel hot-rolled strip steel after the first-stage hydrochloric acid pickling into a second-stage hydrochloric acid pickling solution for carrying out second-stage hydrochloric acid pickling, wherein the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 190g/L, the iron ion concentration is 10g/L, the temperature is 70 ℃, and the second-stage hydrochloric acid pickling time is 48 s;
(4) and grinding and brushing 441 ferritic stainless steel hot-rolled strip steel subjected to second-stage hydrochloric acid pickling, wherein the diameter of brush bristles of a roller brush adopted by the grinding and brushing is 1mm, the brush bristles contain silicon carbide grinding materials with 180 meshes, the rotating speed of a roller brush motor is set to be 800rpm, and the current of the roller brush motor is set to be 180A.
Example 3
The strip steel to be treated by the high-surface environment-friendly pickling process for the stainless steel hot-rolled strip steel in the embodiment 3 is 4Cr13 martensitic stainless steel hot-rolled strip steel, the thickness of the strip steel is 3.0mm, and the process comprises the following steps of:
(1)4Cr13 martensitic stainless steel hot-rolled strip steel enters a scale breaking unit connected in series from an inlet section through an inlet loop, the total elongation is controlled to be 4%, and descaling pretreatment is carried out;
(2) soaking the 4Cr13 martensitic stainless steel hot-rolled strip steel subjected to descaling pretreatment into a first hydrochloric acid pickling solution to perform first hydrochloric acid pickling, wherein the hydrochloric acid concentration of the first hydrochloric acid pickling solution is 100g/L, the iron ion concentration is 15g/L, the temperature is 65 ℃, and the first hydrochloric acid pickling time is 30 s;
(3) immersing the 4Cr13 martensitic stainless steel hot-rolled strip steel subjected to the first-stage hydrochloric acid pickling into a second-stage hydrochloric acid pickling solution for second-stage hydrochloric acid pickling, wherein the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 80g/L, the iron ion concentration is 12g/L, the temperature is 55 ℃, and the second-stage hydrochloric acid pickling time is 30 s;
(4) and (3) grinding and scrubbing the 4Cr13 martensitic stainless steel hot rolled strip steel subjected to the second-stage hydrochloric acid pickling, wherein the diameter of brush bristles of a roller brush adopted by the grinding and scrubbing is 1mm, the brush bristles contain silicon carbide grinding materials with 180 meshes, the rotating speed of a roller brush motor is set to be 700rpm, and the current of the roller brush motor is set to be 175A.
Experiments prove that after the 430 ferrite stainless steel hot-rolled strip steel, 441 ferrite stainless steel hot-rolled strip steel and 4Cr13 martensite stainless steel hot-rolled strip steel which are respectively treated by the stainless steel hot-rolled strip steel high-surface environment-friendly acid pickling process of the embodiments 1, 2 and 3 are subjected to two-stage hydrochloric acid pickling and grinding and brushing of descaling pretreatment, first-stage hydrochloric acid pickling and second-stage hydrochloric acid pickling, no residual iron oxide scale exists on the surface of the stainless steel hot-rolled strip steel, the surface roughness Ra of the stainless steel hot-rolled strip steel is less than or equal to 2.0 mu m, and the requirement of the high surface grade of a hot plate is met.
The pickling process of the stainless steel hot-rolled strip steel adopts a descaling machine set descaling process, a two-stage hydrochloric acid pickling process and a grinding and scrubbing process, has a good pickling effect, can gradually remove oxide skin and a chromium-poor layer on the surface of the stainless steel hot-rolled strip steel, and reduces the surface roughness Ra of the stainless steel hot-rolled strip steel from 3.5-4.5 mu m to 1.0-2.0 mu m, so that the subsequent cold-rolled strip steel can obtain good surface quality.
In conclusion, the stainless steel hot-rolled strip steel pickling process adopts the descaling unit to carry out descaling pretreatment, so that the surface roughness, investment and operation cost of the stainless steel hot-rolled strip steel can be reduced, and the subsequent cold-rolled strip steel can obtain good surface quality; the acid washing process of the stainless steel hot rolled strip steel does not use sulfuric acid, so that the discharge of solid waste and the generation of acid mud are reduced, the problems of difficult stacking of the solid waste and secondary environmental pollution caused by the difficult stacking of the solid waste are solved, the shutdown maintenance frequency in acid washing production is reduced, and the production efficiency is improved; the pickling process of the stainless steel hot-rolled strip steel does not involve mixed acid (HNO)3+ HF), thus avoid producing high polluting nitrogen oxide and nitrogenous waste water, reduce production cost and waste water treatment cost, has lightened the environmental pollution; the stainless steel hot rolled strip steel pickling process adopts two-stage hydrochloric acid pickling, namely the first-stage hydrochloric acid pickling and the second-stage hydrochloric acid pickling, and reasonably controls the hydrochloric acid concentration and the iron ion concentration of the hydrochloric acid pickling solution and the temperature of the hydrochloric acid pickling solution, so that the pickling time of the stainless steel hot rolled strip steel is shortened.
It should be noted that the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (5)
1. The pickling process of the stainless steel hot-rolled strip steel is characterized by comprising the following steps of:
a descaling pretreatment step of a descaling unit, wherein the stainless steel hot-rolled strip steel is subjected to descaling pretreatment through the descaling unit, and the total elongation of the stainless steel hot-rolled strip steel is controlled to be more than or equal to 3.0%;
a first-stage hydrochloric acid pickling step, namely soaking the stainless steel hot-rolled strip steel subjected to descaling pretreatment into a first-stage hydrochloric acid pickling solution to perform first-stage hydrochloric acid pickling, wherein the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is controlled to be 50-300 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 60-80 ℃, and the first-stage hydrochloric acid pickling time is controlled to be 25-50 s;
a second hydrochloric acid pickling step, namely soaking the stainless steel hot-rolled strip steel subjected to the first hydrochloric acid pickling into a second hydrochloric acid pickling solution to perform second hydrochloric acid pickling, wherein the hydrochloric acid concentration of the second hydrochloric acid pickling solution is controlled to be 50-250 g/L, the iron ion concentration is controlled to be 5-100 g/L, the temperature is controlled to be 50-75 ℃, and the second hydrochloric acid pickling time is controlled to be 25-50 s;
and a grinding and brushing step, wherein the stainless steel hot rolled strip steel subjected to the second-stage hydrochloric acid pickling is ground and brushed, the diameter of brush bristles of a roller brush used for grinding and brushing is controlled to be 0.7-1 mm, the brush bristles contain silicon carbide abrasive, the mesh number of the silicon carbide abrasive is 170-200 meshes, the rotating speed of a roller brush motor is controlled to be 600-1000 rpm, and the current of the roller brush motor is controlled to be 100-200A.
2. The pickling process of the stainless hot-rolled strip steel according to claim 1, wherein the stainless hot-rolled strip steel is a medium-low chromium 400 series stainless hot-rolled strip steel containing Cr less than or equal to 18% and containing no Mo.
3. The pickling process of the stainless hot-rolled strip steel according to claim 1 or 2, characterized in that:
the stainless steel hot-rolled strip steel is 430 ferrite stainless steel hot-rolled strip steel;
in the descaling pretreatment step of the descaling unit, the total elongation of the 430 ferrite stainless steel hot-rolled strip steel is controlled to be 4.5 percent;
in the first-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is 185g/L, the iron ion concentration is 20g/L, the temperature is 70 ℃, and the first-stage hydrochloric acid pickling time is 30 s;
in the second-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 160g/L, the iron ion concentration is 12g/L, the temperature is 65 ℃, and the second-stage hydrochloric acid pickling time is 30 s;
in the grinding and brushing step, the diameter of the brush hair of the roller brush is 1mm, the brush hair contains 180 meshes of silicon carbide abrasive, the rotating speed of a motor of the roller brush is 700rpm, and the current of the motor of the roller brush is 175A.
4. The pickling process of the stainless hot-rolled strip steel according to claim 1 or 2, characterized in that:
the stainless steel hot-rolled strip steel is 441 ferrite stainless steel hot-rolled strip steel;
in the descaling pretreatment step of the descaling unit, the total elongation of the 441 ferritic stainless steel hot-rolled strip steel is controlled to be 7 percent;
in the first-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is 220g/L, the iron ion concentration is 18g/L, the temperature is 75 ℃, and the first-stage hydrochloric acid pickling time is 48 s;
in the second-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 190g/L, the iron ion concentration is 10g/L, the temperature is 70 ℃, and the second-stage hydrochloric acid pickling time is 48 s;
in the grinding and brushing step, the diameter of the brush hair of the roller brush is 1mm, the brush hair contains 180 meshes of silicon carbide abrasive, the rotating speed of a motor of the roller brush is 800rpm, and the current of the motor of the roller brush is 180A.
5. The pickling process of the stainless hot-rolled strip steel according to claim 1 or 2, characterized in that:
the stainless steel hot-rolled strip steel is 4Cr13 martensitic stainless steel hot-rolled strip steel;
in the descaling pretreatment step of the descaling unit, the total elongation of the 4Cr13 martensitic stainless steel hot-rolled strip steel is controlled to be 4%;
in the first-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the first-stage hydrochloric acid pickling solution is 100g/L, the iron ion concentration is 15g/L, the temperature is 65 ℃, and the first-stage hydrochloric acid pickling time is 30 s;
in the second-stage hydrochloric acid pickling step, the hydrochloric acid concentration of the second-stage hydrochloric acid pickling solution is 80g/L, the iron ion concentration is 12g/L, the temperature is 55 ℃, and the second-stage hydrochloric acid pickling time is 30 s;
in the grinding and brushing step, the diameter of the brush hair of the roller brush is 1mm, the brush hair contains 180 meshes of silicon carbide abrasive, the rotating speed of a motor of the roller brush is 700rpm, and the current of the motor of the roller brush is 175A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321753.8A CN111604786A (en) | 2020-04-22 | 2020-04-22 | Acid pickling process for stainless steel hot-rolled strip steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321753.8A CN111604786A (en) | 2020-04-22 | 2020-04-22 | Acid pickling process for stainless steel hot-rolled strip steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111604786A true CN111604786A (en) | 2020-09-01 |
Family
ID=72194810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010321753.8A Pending CN111604786A (en) | 2020-04-22 | 2020-04-22 | Acid pickling process for stainless steel hot-rolled strip steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111604786A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112264840A (en) * | 2020-09-18 | 2021-01-26 | 浙江谋皮环保科技有限公司 | Method for removing oxide skin on steel surface and application |
| CN112967767A (en) * | 2021-01-29 | 2021-06-15 | 北京电子科技职业学院 | Optimization method of shot blasting-pickling combined descaling process |
| CN113088980A (en) * | 2021-04-02 | 2021-07-09 | 山西太钢不锈钢股份有限公司 | Production method of iron chromium aluminum alloy hot-rolled strip steel surface oxide skin through hydrochloric acid pickling |
| CN114381581A (en) * | 2022-01-13 | 2022-04-22 | 山西太钢不锈钢股份有限公司 | Method for eliminating ultra-pure ferrite stainless steel hot-rolled surface roughness |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3830010B2 (en) * | 1999-03-17 | 2006-10-04 | 日鐵住金溶接工業株式会社 | Manufacturing method of steel wire for gas shielded arc welding |
| CN104120438A (en) * | 2014-07-22 | 2014-10-29 | 中冶南方工程技术有限公司 | Pickling production method for hot-rolling 304 Austenitic stainless steel strip steel |
| CN105256323A (en) * | 2015-11-04 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous acid pickling method for hot-rolled dual-phase steel |
| CN110468442A (en) * | 2019-09-23 | 2019-11-19 | 中冶南方工程技术有限公司 | A kind of cold rolling 409L ferritic stainless steel strip steel acid cleaning process |
| CN110528009A (en) * | 2019-09-23 | 2019-12-03 | 中冶南方工程技术有限公司 | A kind of 304 austenitic stainless steel of cold rolling is without nitric acid acidwashing technique |
-
2020
- 2020-04-22 CN CN202010321753.8A patent/CN111604786A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3830010B2 (en) * | 1999-03-17 | 2006-10-04 | 日鐵住金溶接工業株式会社 | Manufacturing method of steel wire for gas shielded arc welding |
| CN104120438A (en) * | 2014-07-22 | 2014-10-29 | 中冶南方工程技术有限公司 | Pickling production method for hot-rolling 304 Austenitic stainless steel strip steel |
| CN105256323A (en) * | 2015-11-04 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous acid pickling method for hot-rolled dual-phase steel |
| CN110468442A (en) * | 2019-09-23 | 2019-11-19 | 中冶南方工程技术有限公司 | A kind of cold rolling 409L ferritic stainless steel strip steel acid cleaning process |
| CN110528009A (en) * | 2019-09-23 | 2019-12-03 | 中冶南方工程技术有限公司 | A kind of 304 austenitic stainless steel of cold rolling is without nitric acid acidwashing technique |
Non-Patent Citations (1)
| Title |
|---|
| 何汝迎: "《不锈钢冷轧生产技术及产品应用》", 31 August 2014 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112264840A (en) * | 2020-09-18 | 2021-01-26 | 浙江谋皮环保科技有限公司 | Method for removing oxide skin on steel surface and application |
| CN112967767A (en) * | 2021-01-29 | 2021-06-15 | 北京电子科技职业学院 | Optimization method of shot blasting-pickling combined descaling process |
| CN112967767B (en) * | 2021-01-29 | 2023-06-09 | 北京电子科技职业学院 | Shot blasting-pickling combined descaling process optimization method |
| CN113088980A (en) * | 2021-04-02 | 2021-07-09 | 山西太钢不锈钢股份有限公司 | Production method of iron chromium aluminum alloy hot-rolled strip steel surface oxide skin through hydrochloric acid pickling |
| CN113088980B (en) * | 2021-04-02 | 2022-09-20 | 山西太钢不锈钢股份有限公司 | Production method of iron chromium aluminum alloy hot-rolled strip steel surface oxide skin through hydrochloric acid pickling |
| CN114381581A (en) * | 2022-01-13 | 2022-04-22 | 山西太钢不锈钢股份有限公司 | Method for eliminating ultra-pure ferrite stainless steel hot-rolled surface roughness |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111604786A (en) | Acid pickling process for stainless steel hot-rolled strip steel | |
| CN102719831A (en) | Method for removing scales on surface of hot-rolled stainless steel strip | |
| CN105297040B (en) | A kind of 304 austenic stainless steel belt steel surface de-scaling of hot rolling is passivated production technology | |
| KR101403064B1 (en) | Process for descaling a ferrite stainless steel strip using nitric acid free solutions | |
| CN112139861A (en) | Steel surface rust removal method | |
| CN207578196U (en) | A kind of belt steel surface descaling system | |
| CN109457260A (en) | A kind of acid washing method of 2205 double-phase stainless steel coil | |
| JP2004306077A (en) | Manufacturing method of stainless steel strip | |
| CN107460491A (en) | A kind of environment-friendly hot rolling low chrome ferritic stainless steel acid washing method | |
| JP6173514B1 (en) | Manufacturing method of ferritic stainless steel sheet | |
| US6843860B2 (en) | Method and device for pickling hot-rolled special steel strips | |
| CN112831791B (en) | Pickling process of hot-rolled 409L ferrite stainless steel strip steel | |
| KR20190020948A (en) | Scale removing apparatus for ferritic stainless steel and method for removing scale using the same | |
| KR100395135B1 (en) | Cleaning method of ferritic stainless steel | |
| CN109807754A (en) | A kind of belt steel surface descaling method and system | |
| JP3430661B2 (en) | Pickling method for stainless steel | |
| CN214597693U (en) | Pickling waste liquid treatment system and stainless steel pickling system | |
| KR20130017408A (en) | Eco-friendly scale removing system of martensitic stainless steel sheet and method for manufacturing martensitic stainless steel sheet using the same | |
| JPH05177238A (en) | Method for descaling hot-rolled steel strip | |
| JP3457464B2 (en) | Method for smooth pickling of hot-rolled austenitic stainless steel strip | |
| JP3546307B2 (en) | Pickling method for stainless steel plate | |
| CN112853455A (en) | Acid pickling method for cold-rolled 304 austenitic stainless steel strip steel | |
| JPH03207879A (en) | Descaling equipment for metallic sheet | |
| CN116571584A (en) | Metal plate strip acid-less descaling process | |
| KR20230091617A (en) | Pickling method of stainless hot-rolled steel sheet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200901 |
|
| RJ01 | Rejection of invention patent application after publication |