CN112571288A - Environment-friendly method for descaling surfaces of titanium and titanium alloy plates and strips - Google Patents
Environment-friendly method for descaling surfaces of titanium and titanium alloy plates and strips Download PDFInfo
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- CN112571288A CN112571288A CN202011294605.8A CN202011294605A CN112571288A CN 112571288 A CN112571288 A CN 112571288A CN 202011294605 A CN202011294605 A CN 202011294605A CN 112571288 A CN112571288 A CN 112571288A
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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
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
Abstract
The invention relates to the field of production, processing and manufacturing of titanium and titanium alloy plates and strips, in particular to an environment-friendly method for descaling the surfaces of titanium and titanium alloy plates and strips. The invention provides an environment-friendly method for descaling the surfaces of titanium and titanium alloy plates and strips, which comprises the following steps: s1, feeding titanium and titanium alloy plate strips, and running on a channel at a constant speed; s2, simultaneously impacting the upper surface and the lower surface of the titanium and titanium alloy plate strip at the same angle by the pressurized sand-water mixture; s3, washing the upper surface and the lower surface of the titanium and titanium alloy plate strip at the same angle by the pressurized water at the same time, and drying; and S4, blanking titanium and titanium alloy plates and strips. The method for descaling the surfaces of the titanium and titanium alloy plates and strips does not comprise the traditional mixed acid pickling step, and has the advantages of environmental protection, low cost, simple steps and the like.
Description
Technical Field
The invention relates to the field of production, processing and manufacturing of titanium and titanium alloy plates and strips, in particular to an environment-friendly method for descaling the surfaces of titanium and titanium alloy plates and strips.
Background
Titanium and titanium alloys have been widely used in a variety of industrial fields due to their advantages of low density, high strength, high thermal strength, and good corrosion resistance. However, titanium and titanium alloys are active at high temperatures, for example, when heated to 250 ℃ in the atmosphere and oxidized, yellow oxide films begin to appear on the surface when heated to about 540 ℃, and the oxidation speed is significantly increased at 760-1100 ℃. During the thermal oxidation process, C, O, N, H and other impurities diffuse into titanium and titanium alloy to form scale with high hardness and high brittleness, which results in cracking on the surface of the material during subsequent processing and use and reduced use performance of the material.
In order to industrially remove scales on the surface of titanium and titanium alloy plates and strips and prevent the performance of the titanium and titanium alloy plates and strips from being reduced, a mixed acid pickling process of nitric acid and hydrofluoric acid is mainly adopted, and the basic process comprises the following steps: uncoiling, straightening, descaling, cleaning, sulfuric acid pickling, cleaning (brushing and rinsing), pre-cleaning, primary mixed acid pickling (hydrofluoric acid + nitric acid), cleaning (brushing and rinsing), secondary mixed acid pickling (hydrofluoric acid + nitric acid), tertiary mixed acid pickling (hydrofluoric acid + nitric acid), cleaning (brushing and rinsing), drying, coiling and the like. Wherein, the reaction principle of the one-to-three-stage mixed acid pickling is shown as the formula (1):
2TiO2+4HNO3+4HF＝TiF4+4H2O+Ti(NO3)4 (1)。
according to the above process and reaction principle, the existing method for descaling the surface of titanium and titanium alloy plate and strip has the following disadvantages: (1) the process flow is long; (2) in the step of mixed acid pickling, nitric acid and hydrofluoric acid are needed, the process safety is low, and the corrosion rate of equipment is high; (3) the acid cost of the mixed acid pickling process is high; (4) in the step of mixed acid pickling, once the scale is damaged, the matrix reacts violently with acid, so that the loss of the metal body is large and the yield is low; (5) in the whole treatment process, acidic wastewater and polluting gas can be generated, and the environment is polluted.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems in the prior art. Therefore, the invention provides an environment-friendly method for descaling the surfaces of titanium and titanium alloy plates and strips.
An environment-friendly method for descaling the surfaces of titanium and titanium alloy plates and strips comprises the following steps:
s1, feeding titanium and titanium alloy plate strips, and running on a channel at a constant speed;
s2, simultaneously impacting the upper surface and the lower surface of the titanium and titanium alloy plate strip at the same angle by the pressurized sand-water mixture;
s3, washing the upper surface and the lower surface of the titanium and titanium alloy plate strip at the same angle by the pressurized water at the same time, and drying;
and S4, blanking titanium and titanium alloy plates and strips.
According to an embodiment of the present invention, the operation in step S1 is performed at a constant speed of 5-30 m/min.
According to a preferred embodiment of the present invention, the operation in step S1 is performed at a constant speed of 10-20 m/min.
According to one embodiment of the present invention, the upper and lower surfaces of the titanium and titanium alloy sheet and strip are impacted simultaneously in steps S2 and S3 to achieve uniform stress and avoid the titanium and titanium alloy sheet and strip from deforming due to uneven stress caused by sand-water mixture or water angle difference during the descaling process.
According to one embodiment of the present invention, the sand-water mixture in step S2 is a sufficient mixture of stainless steel shot and water.
According to one embodiment of the invention, the diameter of the stainless steel shot is 0.3-0.5 mm.
According to one embodiment of the invention, the reason that the diameter of the stainless steel shot is 0.3-0.5 mm is to take the flatness of the surface of the plate and strip material and the complete scale removal degree into consideration.
According to an embodiment of the present invention, the sand-water mixture described in step S2 contains 30% to 70% of sand by mass.
According to an embodiment of the present invention, the impact in step S2 is performed under a pressure of 50-80 MPa.
According to one embodiment of the present invention, the pressurized sand-water mixture and the running direction of the titanium and titanium alloy plate strip are at an angle of 95-135 ° by the impact described in step S2.
According to one embodiment of the present invention, step S2 is performed to peel off scale on the surface of titanium or titanium alloy from the metallic substrate by the impact force and cutting force of the stainless steel shot and the scouring force of water in the pressurized sand-water mixture, thereby achieving the objective of mechanical descaling.
According to one embodiment of the present invention, the sand-water mixture is pressurized by a high pressure pump or by centrifugal force in step S2.
According to one embodiment of the present invention, the stainless steel shot is selected because titanium is a corrosion-resistant metal, and the stainless steel shot has better corrosion resistance, wear resistance and machinability among the same size of shot.
According to an embodiment of the present invention, in step S3, the pressure of the flushing is 8 to 10 MPa.
According to an embodiment of the present invention, in step S3, the drying is performed by drying with hot air at 60-80 ℃.
According to an embodiment of the present invention, in step S3, the water after washing and pressurizing forms an angle of 95 ° to 135 ° with the running direction of the titanium and titanium alloy plate strip.
According to one embodiment of the present invention, in step S3, the washing is performed to further peel off the scale on the surface of the titanium or titanium alloy sheet strip by the washing force generated by the pressurized water, and to wash off the scale peeled off in step S2 but still attached to the surface of the sheet strip.
According to an embodiment of the present invention, after the treatment of the steps S1 to S4, the titanium and titanium alloy plate and strip have clean surface, uniform color and 3 to 8 μm roughness, which meets the requirements of subsequent processing and use of the titanium and titanium alloy plate and strip.
According to one embodiment of the invention, in the environment-friendly method for descaling the surfaces of the titanium and titanium alloy plates and strips, the adopted water and stainless steel shots are recycled, no waste water or waste gas is discharged, the process is environment-friendly, and the resources are saved.
The scale on the surface of the titanium and titanium alloy plate strip comprises oxygen pollution and nitrogen pollution.
The mechanism of oxygen contamination is: at 500 ℃ or below, oxygen in the air reacts with titanium to generate titanium oxide on one hand, and migrates into the titanium substrate on the other hand, and the step of generating titanium oxide is a speed control step, so that oxygen contamination mainly exists in the oxide film with a dense surface; when the temperature exceeds 700 ℃, the dense oxide film on the surface loses the protection effect on the body, and the migration of oxygen in titanium is accelerated; when the temperature exceeds 950 ℃, oxygen diffuses into the matrix through anion vacancies and phase boundaries of the same oxide, titanium diffuses to the surface, and the oxide layer deepens.
The mechanism of nitrogen contamination is: when the temperature is higher than 538 ℃, nitrogen in the air firstly generates a solid solution with titanium (nitrogen diffuses into the titanium matrix), and then a titanium nitride film is formed, and the nitrogen continues to diffuse through the TiN layer with the increase of the temperature and the increase of the time, so that the thickness of the TiN layer is increased.
Because the hot-rolled titanium strip coil is subjected to the steps of casting, hot rolling and the like, under the influence of working conditions such as nitrogen, oxygen concentration, processing temperature and the like, the penetration depth of nitrogen impurities is usually higher than that of oxygen impurities, so that a sand-water mixture needs to be formed by mixing stainless steel shots with better wear resistance and cutting performance with water, and nitrogen and oxygen impurities with different penetration depths on the surfaces of titanium and titanium alloy plates and strips can be removed through the impact of the sand-water mixture.
After accounting, the cost of the method provided by the invention is lower than that of the traditional shot blasting and pickling method. The cost figures for processing one ton of titanium and titanium alloy plate strip are shown in table 1.
Table 1 cost accounting for processing one ton of titanium and titanium alloy sheet strip.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) according to the environment-friendly method for descaling the surfaces of the titanium and titanium alloy plates and strips, provided by the invention, the scale on the surfaces of the titanium and titanium alloy plates and strips is removed by utilizing the physical cutting force brought by the high-pressure sand-water mixture and replacing the traditional mixed acid pickling method with a mechanical method, and the metal body is prevented from being corroded by the mixed acid, so that the loss of the metal body is only 0.01%, and the loss of the metal body in the traditional mixed acid pickling process can reach 1.5-3%.
(2) According to the environment-friendly method for descaling the surfaces of the titanium and titanium alloy plates and strips, the used stainless steel shots and water can be recycled, industrial waste water and waste gas are not generated, and the environment is protected.
(3) The invention has simple process and low cost; after accounting, the cost for processing 1 ton of titanium or titanium alloy plate strip is 500 yuan; the cost of the traditional industrial treatment of one ton of titanium or titanium alloy is up to 980 yuan, which is about twice of the cost of the invention.
(4) The invention has mild condition, does not adopt strong acid and corrosive acid, thereby having safe operation and low corrosion loss of equipment.
(5) The titanium strip treated by the method provided by the invention has good mechanical property and surface property, wherein the Vickers hardness of the surface is more than or equal to 186.0HV5, and the Vickers hardness of the section is more than or equal to 165.0HV 5; longitudinal yield strength 373N/mm2Transverse yield strength of 477N/mm2(ii) a Transverse tensile strength of 535N/mm2Tensile strength in the machine direction of 552N/mm2(ii) a The transverse after-fracture elongation rate is 23.5 percent, and the longitudinal after-fracture elongation rate is 20.0 percent, thereby meeting the industrial standard.
Drawings
FIG. 1 is a surface SEM image of an untreated TA1 type hot rolled titanium coil.
FIG. 2 is a cross-sectional view of an untreated TA1 type hot rolled titanium coil.
Fig. 3 is a surface SEM image of the titanium strip 1.
Fig. 4 is a cross-sectional view of the titanium strip 1.
Fig. 5 is a surface SEM image of a comparative titanium strip 1.
Fig. 6 is a cross-sectional view of a comparative titanium strip 2.
FIG. 7 is a graphical representation of the change in oxygen content with depth in a titanium strip.
FIG. 8 is a graphical representation of nitrogen as a function of depth in a titanium strip.
FIG. 9 is a schematic diagram of the process of the present invention.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the embodiments and the drawings, but the present invention is not limited to these embodiments.
Example 1
The embodiment provides an environment-friendly method for descaling the surface of a titanium and titanium alloy plate strip, which specifically comprises the following steps:
s1, feeding a TA1 type hot-rolled titanium coil with the thickness of 2.8mm and the thickness of an oxidation layer of 3-5 microns, and running on a channel at a constant speed of 10 m/min;
s2, pressurizing a sand-water mixture with a stainless steel shot (diameter of 0.3mm) mass fraction of 50% to 50MPa by using a high-pressure pump, and impacting the upper surface and the lower surface of the titanium alloy strip in a direction forming an included angle of 110 degrees with the running direction of the TA1 type hot-rolled titanium coil;
s3, pressurizing water to 8MPa by using a high-pressure pump, and impacting the upper surface and the lower surface of the titanium alloy strip in a direction forming an included angle of 110 degrees with the running direction of the TA1 type hot-rolled titanium coil; then drying by hot air at 50 ℃;
and S4, blanking the processed TA1 type hot-rolled titanium coil and winding the titanium coil into a coil.
A titanium strip 1 is obtained.
The schematic diagram of the treatment method is shown in fig. 9.
Comparative example 1
The comparison example provides a method for descaling the surface of a titanium and titanium alloy strip, and the difference between the specific steps and the example 1 is as follows:
in step S2, the 0.3mm stainless steel shot is replaced with a 0.3mm cast steel shot.
A comparative titanium strip 1 was obtained.
Comparative example 2
The comparative example provides a method for descaling the surfaces of titanium and titanium alloys, which is recorded in the national standard document 'method for descaling and cleaning the surfaces of titanium and titanium alloys' (number: GB/T23602-2009), and comprises the following specific steps:
s1, feeding a TA1 type hot-rolled titanium coil with the thickness of 2.8mm and the thickness of an oxidation layer of 3-5 microns, and running on a channel at a constant speed of 10 m/min;
s2, performing dry shot blasting treatment on the upper surface and the lower surface of the TA1 type hot-rolled titanium coil by using 0.3mm stainless steel shots;
s3, preparing mixed acid according to the proportion of 150 g/L-450 g/L nitric acid and 12 g/L-36 g/L hydrofluoric acid, and treating the titanium strip obtained in the step S2 at the temperature of 49 ℃;
s4, pressurizing water to 8MPa by using a high-pressure pump, and impacting the upper surface and the lower surface of the titanium alloy strip in a direction forming an included angle of 100 degrees with the running direction of the TA1 type hot-rolled titanium coil; then drying by hot air at 50 ℃;
and S5, blanking the processed TA1 type hot-rolled titanium coil and winding the titanium coil into a coil.
A comparative titanium strip 2 was obtained.
Detection example 1
The example provides morphology detection of a TA1 hot rolled strip, a titanium strip 1 and comparative titanium strips 1-2, and specifically comprises visual observation of the apparent morphology of the strip before and after treatment, SEM detection of the surface morphology of the strip before and after treatment, and metallographic detection of the cross-sectional morphology of the strip before and after treatment.
Through visual observation, the titanium strip 1 and the comparative titanium strips 1-2 both have flat surfaces and are free of deformation; and because the scale on the surface of the titanium strip is peeled or partially peeled, the titanium strip has more obvious metallic luster than the TA1 hot rolled strip before treatment.
The surface topography of the untreated TA1 hot rolled strip is shown in fig. 1; the surface topography of the titanium strip 1 is shown in FIG. 3; the surface topography of the comparative titanium strip 1 is shown in fig. 5. From the SEM images of the surface topography described above, it can be seen that: (1) the untreated TA1 strip had a rough surface with a crazing texture indicating that the titanium strip surface did have scale formation inconsistent with the crystallinity of the titanium bulk. (2) The surfaces of the titanium strip 1 and the comparative titanium strip 1 are similar, and the surfaces of the titanium strip 1 are smoother and smoother than those of the untreated TA1 strip; the scale on the surface of the titanium strip can be effectively removed without deformation by the impact of the sand-water mixture consisting of the stainless steel shots or the cast steel shots.
The cross-sectional profile of the untreated TA1 strip is shown in fig. 2; the cross-sectional profile of the titanium strip 1 is shown in FIG. 4; the cross-sectional profile of the comparative titanium strip 2 is shown in fig. 6. From the above results of the characterization of the cross-sectional morphology, it can be seen that: (1) a layer of film with obvious texture different from that of the body exists on the surface of the untreated TA1 strip, which indicates that the surface of the titanium strip is provided with scale; (2) after the treatment by the method provided by the invention, the cross section of the titanium strip 1 is uniform in texture, which shows that the surface descaling method provided by the invention can effectively remove scale on the surface of the titanium strip; (3) the comparative titanium strip 2 was subjected to an acid pickling step, with a smooth surface, showing: the surface of the titanium strip material after being acid-washed by a chemical method has no oxide, and is a metal body, which can cause acid corrosion of the metal body.
Detection example 2
The embodiment provides the component detection of the TA1 hot rolled strip, the titanium strip 1 and the comparative titanium strips 1-2, and specifically comprises the characterization of impurity components on the surface of the strip before and after the characterization treatment by an EDS method and the characterization of the change of the impurity components along with the depth.
The characterization results of the surface composition of the titanium strip are shown in table 2:
TABLE 2 surface composition of titanium strip
Wherein "-" represents no detection.
From the results described in table 2, it can be seen that: (1) the mass content of oxygen impurities contained on the surface of the untreated TA1 strip is more than or equal to 36.29 percent, which indicates that the surface of the strip contains an obvious oxide layer; the content of oxygen impurities on the surfaces of the titanium strip 1 and the comparative titanium strip 1 is obviously reduced, which shows that the content of an oxide layer on the surface of the titanium strip is obviously reduced after the titanium strip is impacted by the sand-water mixture; secondly, the oxygen content of the surface of the titanium strip 1 is slightly lower than that of the comparative titanium strip 1, which shows that the sand-water mixture composed of the stainless steel shots has higher cutting force than the sand-water mixture composed of the cast steel shots, and can achieve better descaling effect on the surface of the titanium strip. (2) The mass content of nitrogen impurities contained on the surface of the untreated TA1 strip is more than or equal to 0.87%, which indicates that the surface of the strip contains a certain nitrogen impurity layer; the nitrogen impurities in the titanium strip 1 are not detected, which shows that the sand-water mixture consisting of the stainless steel shots can effectively remove the nitrogen impurity layer with deeper depth; in contrast, the content of nitrogen impurities on the surface of the titanium strip is increased on the contrary, which indicates that the cutting force of the sand-water mixture consisting of the cast steel shots is insufficient, and the nitrogen impurities on the surface of the titanium strip cannot be effectively removed.
The variation of the oxygen impurity content in the titanium strip with depth is shown in fig. 7, and it can be known from the graphical information that: (1) the distribution depth of oxygen impurities in the titanium strip is generally less than 10 mu m; (2) the untreated titanium strip with the highest surface oxygen content and, secondly, the comparative titanium strip 1, the titanium strip 1 with the lowest oxygen impurity content. The above results show that (1) the method for descaling the surface of the titanium and titanium alloy plate strip provided by the invention can effectively remove the surface oxide layer; (2) the sand-water mixture composed of the stainless steel shots has better effect on descaling the surfaces of the titanium and titanium alloy plates and strips than the sand-water mixture composed of the cast steel shots.
The variation of the nitrogen impurity content with depth is shown in fig. 8, and the graphical information shows that: (1) the distribution depth of nitrogen impurities in the titanium strip is more than 30 mu m; (2) the highest nitrogen content is untreated titanium strip; in the comparative titanium strip 1, the nitrogen content at a depth of < 10 μm is significantly reduced, but the nitrogen content at a depth of > 10 μm is essentially unchanged; the nitrogen impurity content of the titanium strip 1 is reduced overall. In the experimental range, the sand-water mixture consisting of stainless steel shots is adopted to carry out surface descaling treatment on the titanium and titanium alloy plate strips, so that nitrogen impurities with the depth of more than 10 mu m can be effectively removed.
In conclusion, the mechanical method of high-pressure sand-water mixture impact can effectively remove the scale on the surface of the titanium and titanium alloy plate strip; if the oxygen impurities with the depth less than 10 mu m and the nitrogen impurities with the depth more than 30 mu m are to be removed simultaneously, the sand-water mixture consisting of stainless steel shots is needed to impact the surface of the titanium and titanium alloy plate strip, and the sand shots made of other materials such as cast steel can not meet the requirements.
Detection example 3
The present example provides a case hardening and mechanical property characterization of titanium strip 1 and comparative titanium strip 2. The characterization method comprises the following steps:
the surface hardening condition of the material is characterized by referring to a method provided by a national standard document 'metal material Vickers hardness test-test method' with the national standard number GB/T4340.1-2009.
The mechanical properties of the material are represented by referring to a method provided by a national standard document 'metallic material tensile test laboratory-temperature test method' with the national standard number GB/T228.1-2010.
The results of surface hardening of the titanium strip are shown in table 3.
Table 3 surface hardening results of titanium strip.
The results show that the Vickers hardness of the surface and the section of the titanium strip 1 are lower than those of the comparative titanium strip 2, and that (1) the environment-friendly descaling method for titanium and titanium alloy plates and strips, provided by the invention, can effectively remove scale with high hardness and high brittleness on the surface of the titanium strip without generating other high-hardness impurities; (2) compared with the surface descaling method provided by the national standard document 'titanium and titanium alloy surface descaling and cleaning method' (number: GB/T23602-2009), the environment-friendly titanium and titanium alloy plate strip descaling method provided by the invention can effectively remove scale even without the step of mixed acid pickling, and the treated titanium strip has better performance; (3) the surface hardening condition of the plate and strip materials treated by the method is close to or superior to that of the traditional method, and the treated materials meet the requirements of subsequent processing or use.
The mechanical properties of the titanium strip are shown in table 4.
Table 4 mechanical properties results of titanium strip.
The above results show that: the titanium strip 1 is superior to the comparative titanium strip 2 in three mechanical properties of yield strength, tensile strength and elongation after fracture in the longitudinal and transverse directions.
In conclusion, the environment-friendly method for descaling the titanium and titanium alloy plates and strips provided by the invention is superior to the method for descaling the surfaces of the titanium and titanium alloys provided by the national standard document 'method for descaling and cleaning the surfaces of the titanium and titanium alloys' (number: GB/T23602-2009).
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments described above, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. An environment-friendly method for descaling the surfaces of titanium and titanium alloy plates and strips is characterized by comprising the following steps:
s1, feeding titanium and titanium alloy plate strips, and running on a channel at a constant speed;
s2, simultaneously impacting the upper surface and the lower surface of the titanium and titanium alloy plate strip at the same angle by the pressurized sand-water mixture;
s3, washing the upper surface and the lower surface of the titanium and titanium alloy plate strip at the same angle by the pressurized water at the same time, and drying;
and S4, blanking titanium and titanium alloy plates and strips.
2. The method for descaling the surface of a titanium and titanium alloy plate and strip according to claim 1, wherein the step S1 is performed at a constant speed of 5-30 m/min.
3. The method for descaling the surface of a titanium and titanium alloy plate strip according to claim 1, wherein the step S1 is performed at a constant speed of 10-20 m/min.
4. The method of descaling surfaces of titanium and titanium alloy sheet and strip according to claim 1 wherein said sand and water mixture of step S2 is a mixture of stainless steel shot and water.
5. The method of claim 4, wherein the stainless steel shot has a diameter of 0.3mm to 0.5 mm.
6. The method for descaling the surface of a titanium and titanium alloy sheet or strip according to claim 1, wherein the sand-water mixture in step S2 contains 30-70% by mass of sand.
7. The method for descaling the surface of a titanium and titanium alloy sheet or strip according to claim 1, wherein the impact in step S2 is at a pressure of 50 to 80 MPa.
8. The method for descaling the surface of a titanium and titanium alloy sheet or strip according to claim 1, wherein the angle between the pressurized sand-water mixture or water and the running direction of the titanium and titanium alloy sheet or strip is 95 to 135 degrees in steps S2 and S3.
9. The method for descaling the surface of a titanium and titanium alloy sheet or strip according to claim 1, wherein the washing in step S3 is performed at a pressure of 8 to 10 MPa.
10. The method for descaling the surface of a titanium and titanium alloy sheet or strip according to claim 1, wherein the drying step in step S3 is a hot air drying step at 60-80 ℃.
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| US20130084785A1 (en) * | 2010-06-09 | 2013-04-04 | Posco | Descaling apparatus |
| CN103418624A (en) * | 2012-05-25 | 2013-12-04 | 宝山钢铁股份有限公司 | Continuous cold-state metal plate strip jet descaling technology |
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2020
- 2020-11-18 CN CN202011294605.8A patent/CN112571288A/en active Pending
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| US20130084785A1 (en) * | 2010-06-09 | 2013-04-04 | Posco | Descaling apparatus |
| CN103418624A (en) * | 2012-05-25 | 2013-12-04 | 宝山钢铁股份有限公司 | Continuous cold-state metal plate strip jet descaling technology |
| CN204262074U (en) * | 2014-11-25 | 2015-04-15 | 北京首钢国际工程技术有限公司 | A kind of finish rolling De-scaling box with recoil collector |
| CN107457707A (en) * | 2017-08-17 | 2017-12-12 | 中冶赛迪工程技术股份有限公司 | A kind of titanium or titanium alloy surface aoxidize layer minimizing technology |
| CN109807754A (en) * | 2017-11-20 | 2019-05-28 | 中冶赛迪技术研究中心有限公司 | A kind of belt steel surface descaling method and system |
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Application publication date: 20210330 |