Parameter design method of green, low-cost and high-quality descaling technology suitable for cold-state stainless steel

Abstract

The invention relates to a parameter design method of a green, low-cost and high-quality descaling technology suitable for cold-state stainless steel, which comprises the following steps of: selecting abrasive granularity d, abrasive flow Q, high-pressure water nozzle diameter D, jet pressure P, jet angle theta, jet distance h and running speed v of strip steel; the kinetic energy component E, perpendicular to the surface of the steel strip, of abrasive particles exceeds 10 * 10 <-3 > J, the abrasive mass m consumed in the unit area of a strip steel descaling area exceeds 9.5 kg / m < 3 >, and the abrasive mass concentration C in abrasive water jet does not exceed 35%, so that efficient abrasive water jet descaling on the surface of stainless steel is guaranteed, and the service life of the stainless steel strip is prolonged. Wherein the kinetic energy component E, the abrasive mass m consumed per unit area and the abrasive mass concentration C are all calculated by a formula provided by the invention. According to the descaling parameters designed and obtained through the design method, the surface cleanliness after descaling reaches the Sa3.0 level, the high-quality and low-roughness descaling surface is obtained, and meanwhile energy and resource waste caused by excessive descaling is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel surface treatment, and relates to a parameter design method for a cold stainless steel green, low-cost, high-quality descaling technology. Background Art

[0002] During the steel production process, due to the presence of iron oxide scale on the surface of the steel, various product defects such as pits, pitting, and iron oxide indentation are generated on the steel surface. Therefore, it is necessary to remove the iron oxide scale completely, and this process is called descaling. During the hot rolling and heat treatment process, a complex oxide layer structure (iron oxide, chromium oxide, chromium-nickel spinel) and a dechromized layer are formed on the surface of stainless steel at the same time. This complex surface structure brings challenges to the descaling of stainless steel.

[0003] The mainstream descaling methods for stainless steel are chemical pickling and abrasive water jet descaling. The acid mist generated during pickling and descaling seriously affects the workers' operating environment. The cost of waste acid treatment is high, and improper treatment can easily pollute the environment. Abrasive water jet descaling using traditional brittle abrasives, such as pomegranate sand, steel sand and other abrasives, has an abrasive life of only 2-3 years, and the comprehensive descaling cost is higher than chemical pickling. Brittle abrasives cause micro-cutting wear on the stainless steel surface, and some abrasives are embedded in the surface, resulting in a high surface roughness after descaling.

[0004] Cold stainless steel uses a process of rough descaling with a high-speed roller brush + fine descaling with abrasive water jet. The whole process is acid-free and green. The use of Owen's martensitic stainless steel abrasives with a lifespan of up to 3,000 years significantly reduces the overall cost of descaling. The martensitic stainless steel abrasive particles deform and wear on the stainless steel surface, and a high-quality surface with a roughness of 2-3μm can be obtained. If the energy of martensitic stainless steel particles is too low, it will cause incomplete local descaling; if the energy of martensitic stainless steel particles is too high, it will cause energy waste and cause serious surface strengthening of the material, affecting subsequent processing. Therefore, the design of process parameters in the process of fine descaling with abrasive water jet directly affects the final descaling effect.

[0005] The abrasive water jet process involves multiple parameters, including abrasive material, particle size, shape, ejection speed, incident angle, strip running speed, etc. Traditionally, a large number of experiments are required to determine the threshold values ​​of these parameters respectively. Bai Zhenhua et al. published a patent for "an EPS parameter design method suitable for green and efficient pickling-free technology". This patent is applied to the descaling of hot-rolled strip steel, providing an environmentally friendly technology that can remove iron oxide scale without pickling. The design parameters include abrasive material, particle size, shape, ejection speed, incident angle, strip running speed, etc. The abrasive material is steel sand, the particle size is 150, the shape is small angular, the ejection speed is 150-250m / s, the incident angle is 60°-70°, and the strip running speed is 70-90m / min. By accurately calculating these parameters, it is ensured that the pressure and impulse of the abrasive sprayed onto the strip surface are sufficient to remove the oxide layer, while improving production efficiency and reducing costs. Compared with traditional EPS, this technology can significantly improve the descaling speed and strip surface roughness, and reduce iron oxide scale residue. However, the application object of this scheme is the removal of the oxide layer of hot-rolled strip steel, and the removal of the dechromized layer of stainless steel is not considered; and this scheme uses brittle abrasive steel sand to cause micro-cutting wear on the surface of the hot-rolled strip steel. The surface quality after descaling needs to be guaranteed by adding a roller brush to clean the surface. The comprehensive cost of descaling is high and the process is complicated. Liu Jiawei published a paper entitled "Research on Abrasive Water Jet Descaling and Surface Integrity of 2205 Duplex Stainless Steel". This paper discusses the wear mechanism of two abrasives, stainless steel particles and garnet sand, on the surface of stainless steel, gives the influence of the kinetic energy of single stainless steel particles on "flaking" wear, and proposes the kinetic energy threshold of abrasive particles for "flaking" wear. When using stainless steel shots, stainless steel shot deformation wear and stainless steel shot "flaking" wear may occur on the surface of 2205 duplex stainless steel. With the increase of stainless steel shot particle size and working pressure, the deformation wear efficiency of stainless steel shots is significantly improved. When the kinetic energy of stainless steel shots exceeds 3.49×10 -4J, the "sheet" wear of the stainless steel shot starts. When garnet sand is used, micro-cutting wear occurs on the surface of 2205 duplex stainless steel. At an impact angle of 80°, a "pit"-shaped cut groove is formed on the surface, and some garnet sand is embedded in the material to cause surface contamination. However, this paper only discusses the use of a single abrasive water jet for descaling, and abrasive water jets require higher energy intake; and the paper explains the threshold of "sheet" wear on the stainless steel surface from the perspective of stainless steel particle energy, which is significantly different from the actual industrial design parameters required. Dong Wenjie published a paper titled "Simulation of Abrasive Water Jet Descaling Process and Descaling Mechanism Research". This paper studies the simulation and descaling mechanism of abrasive water jet descaling process. The flow field distribution of the abrasive water jet was simulated by Fluent software, and the influence of descaling parameters on the temperature and impact pressure of the plate and strip was analyzed, and the descaling parameters were optimized. Using the Python nonlinear curve fitting method, the impact pressure formula was derived, which provides a theoretical basis for controlling the impact pressure and temperature. LS-DYNA software was used to simulate the rupture effect and analyze the initiation and propagation of cracks in the oxidized iron scale. Based on Workbench software, the fluid-thermal-solid coupling method was used to simulate the cooling effect and the separation of the interface between the oxidized iron scale and the substrate was studied. The scouring effect was simulated by coupling EDEM with Fluent software and the effect of abrasive water jet scouring the oxidized iron scale fragments was analyzed. However, this scheme involves descaling hot carbon steel, using garnet as an abrasive that may cause surface contamination, and using numerical simulation methods for parameter design, which makes the design process complicated. Summary of the invention

[0006] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide a parameter design method for descaling technology suitable for cold stainless steel, by which various descaling parameters can be derived from simple theoretical formulas, and high-quality and low-roughness descaling surfaces can be obtained after descaling by using these descaling parameters, while avoiding the waste of energy and resources caused by excessive descaling.

[0007] In order to achieve the above object, the present invention provides a parameter design method for a green, low-cost, high-quality descaling technology suitable for cold stainless steel, comprising the following steps: By selecting the abrasive particle size d, abrasive flow rate Q, high-pressure water nozzle diameter D, jet pressure P, jet angle θ, jet distance h and running speed v of the steel strip, the kinetic energy component E of the abrasive particles perpendicular to the steel strip surface exceeds 10×10 -3 J. The abrasive mass per unit area of ​​the strip descaling area exceeds 9.5 kg / m 3 , the abrasive mass concentration C in the abrasive water jet does not exceed 35%, thereby ensuring high-efficiency abrasive water jet descaling on the stainless steel surface; Wherein, the kinetic energy component E is calculated by the following formula I: In formula I, V is the volume of the abrasive particles, mm 3 ; ρ is the density of abrasive particles in g / cm 3 ; N is the water jet power, W; Q 水 is the water jet flow rate, kg / min; Q is the abrasive flow rate, kg / min; θ is the injection angle, °; D is the diameter of the high-pressure water nozzle, mm; P is the jet pressure, MPa; The water jet power N in formula I is calculated by the following formula II: In formula II, Q 水 is the water jet flow rate, kg / min; P is the jet pressure, MPa; D is the diameter of the high-pressure water nozzle, mm; The abrasive mass m consumed per unit area in the strip descaling region is calculated by the following formula III: In formula III, v is the running speed of the strip, m / min; D 除 is the diameter of the circular descaling area formed by a single nozzle, mm; The diameter D of the circular descaling area formed by the single nozzle in formula III is 除 Calculated by the following formula IV In formula IV, h is the injection distance, mm; The abrasive mass concentration C in the abrasive water jet is calculated by the following formula V: Q in V 水 is the water jet flow rate, kg / min; Q is the abrasive flow rate, kg / min; P is the jet pressure, MPa; D is the diameter of the high-pressure water nozzle, mm.

[0008] In a possible implementation of the parameter design method of the present invention, the abrasive particles are martensitic stainless steel particles, which are short cylindrical in shape, and the particle volume V is calculated by the following formula VI: V=0.25πd 3 (VI) In formula VI, d is the particle size of the martensitic stainless steel particles, mm.

[0009] In a possible implementation of the parameter design method of the present invention, the abrasive particles are martensitic stainless steel particles in the shape of short rods with a Vickers hardness of 440 HV; the abrasive particle size d is 0.6 to 0.8 mm, the abrasive flow rate Q is 60 to 120 kg / min, the high-pressure water nozzle diameter D is 3 to 4 mm, the jet pressure P is 70 to 90 MPa, the injection angle θ is 75° to 85°, the injection distance h is 80 to 100 mm, and the running speed v of the strip is 4 to 7 m / min.

[0010] The parameter design method of the present invention is derived through a simple theoretical formula as a green, low-cost, high-quality descaling technology for cold stainless steel using a high-speed roller brush for rough descaling and an abrasive water jet for fine descaling, and the descaling parameters including abrasive particle size d, abrasive flow rate Q, high-pressure water nozzle diameter D, jet pressure P, jet angle θ, jet distance h and running speed v of the strip are designed. The descaling parameters designed by the design method of this patent achieve a surface cleanliness of Sa3.0 after descaling, and a high-quality, low-roughness descaling surface is obtained, while avoiding the waste of energy and resources caused by excessive descaling. In addition, the design method of the present invention uses martensitic stainless steel particles as abrasives and cooperates with other descaling parameters to cause deformation and wear on the stainless steel surface. Multiple particles repeatedly impact the same position on the surface to cause deformation and wear, which effectively avoids the adverse effects of using other abrasives on the descaling surface, such as contamination of the descaling surface.

[0011] The above contents of the present invention will be more clearly understood in the following description of multiple embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings of the present invention will be provided below. These drawings are only for embodying the present invention in a more intuitive form. They are exemplary and are not intended to limit the scope of the present invention.

[0013] Figure 1 A schematic diagram showing the movement direction of the nozzle and the strip steel during the descaling process of the present invention is shown. DETAILED DESCRIPTION

[0014] To make the present invention easier to understand, the present invention is further described below in conjunction with specific examples. The experimental methods described in the present invention are conventional methods unless otherwise specified; the materials described are commercially available unless otherwise specified. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention. If there is any inconsistency, the meaning described in this specification or the meaning derived from the contents recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0015] In order to accurately describe the technical contents of the present invention and to accurately understand the present invention, the following explanations or definitions are given for the words and terms used in this specification before describing the specific implementation methods.

[0016] The words "one embodiment" or "an embodiment" as used in this specification means that a particular feature, step, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing throughout this specification do not necessarily all refer to the same embodiment, but may refer to the same embodiment. Furthermore, in one or more embodiments, the particular features, steps, or characteristics may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure.

[0017] The term "chemical pickling and descaling of stainless steel" used in the specification and claims is the most widely used descaling method for hot-rolled stainless steel plates. It combines shot peening and pickling. The specific process is as follows: (1) first use the shot peening process to mechanically damage the surface oxide layer and remove a portion of the oxide layer; (2) then use sulfuric acid or hydrochloric acid for pre-pickling; (3) finally use a mixed solution of nitric acid and hydrofluoric acid for final pickling.

[0018] The term "abrasive water jet" used in the specification and claims is a method of processing materials by using high-speed water flow to drive abrasive particles to spray at high speed. According to the mixing method of abrasive particles and water, it is divided into: front mixing type, rear mixing type and external mixing type. The rear mixing type abrasive water jet (hereinafter referred to as abrasive water jet) is a high-speed water flow and abrasive particles are mixed in the mixing chamber, and sprayed through the abrasive nozzle to form an abrasive water jet.

[0019] The term "Owen life" used in the specification and claims can directly reflect the wear resistance of abrasive particles. A high Owen life means high wear resistance and high quality. A high Owen life means high wear resistance and high quality. It is generally believed that abrasives with an Owen life of more than 2600 are high Owen life abrasives. The martensitic stainless steel particles involved in the present invention have an Owen life of about 3000, which belongs to high Owen life abrasives. The 100% replacement test process of Owen life is as follows: ① Put 100g of abrasive sample into the Owen life tester; ② Circulate until the sample consumption reaches about 20%, and stop the Owen life tester; ③ Take out the sample, sieve the sample with a mesh screen, remove the undersize, weigh the mass of the oversize, and record the loss and cumulative loss; ④ Add the original abrasive sample to make the mass of the oversize reach 100g again, and then circulate: ⑤ Repeat ① to ④ until the cumulative loss is ≥100g; ⑥ The calculation formula of Owen life by 100% replacement method is: Owen life = total number of cycles (number of tests each time / final loss) × (cumulative loss% - 100).

[0020] The term "cold stainless steel green, low-cost, high-quality descaling technology" used in the specification and claims refers to the descaling process of high-speed roller brush rough descaling + abrasive water jet fine descaling. The high-speed roller brush removes most of the iron oxide scale on the surface of the stainless steel (iron oxide scale removal rate ≥ 90%), and the abrasive water jet removes the residual iron oxide scale and dechromed layer on the surface of the stainless steel (the chromium content is significantly lower than that of the substrate, the corrosion resistance is poor, and it must be removed).

[0021] The present invention provides a parameter design method for a green, low-cost, high-quality descaling technology applicable to cold stainless steel, comprising the following steps: By selecting the abrasive particle size d, abrasive flow rate Q, high-pressure water nozzle diameter D, jet pressure P, jet angle θ, jet distance h and running speed v of the steel strip, the kinetic energy component E of the abrasive particles perpendicular to the steel strip surface exceeds 10×10 -3 J. The abrasive mass per unit area of ​​the strip descaling area exceeds 9.5 kg / m 3 , the abrasive mass concentration C in the abrasive water jet does not exceed 35%, thereby ensuring high-efficiency abrasive water jet descaling on the stainless steel surface; Wherein, the kinetic energy component E is calculated by the following formula I: In formula I, V is the volume of the abrasive particles, mm 3 ; ρ is the density of abrasive particles in g / cm 3 ; N is the water jet power, W; Q 水 is the water jet flow rate, kg / min; Q is the abrasive flow rate, kg / min; θ is the injection angle, °; D is the diameter of the high-pressure water nozzle, mm; P is the jet pressure, MPa; The water jet power N in formula I is calculated by the following formula II: In formula II, Q 水 is the water jet flow rate, kg / min; P is the jet pressure, MPa; D is the diameter of the high-pressure water nozzle, mm; The abrasive mass m consumed per unit area in the strip descaling region is calculated by the following formula III: In formula III, v is the running speed of the strip, m / min; D 除 is the diameter of the circular descaling area formed by a single nozzle, mm; The diameter D of the circular descaling area formed by the single nozzle in formula III is 除 Calculated by the following formula IV In formula IV, h is the injection distance, mm; The abrasive mass concentration C in the abrasive water jet is calculated by the following formula V: Q in V 水 is the water jet flow rate, kg / min; Q is the abrasive flow rate, kg / min; P is the jet pressure, MPa; D is the diameter of the high-pressure water nozzle, mm.

[0022] In order to make it easier for those skilled in the art to understand and implement the technical solution of the present invention, exemplary embodiments of the present invention are provided below.

[0023] Embodiment 1

[0024] The abrasive is made of martensitic stainless steel particles with a particle size of 0.6 mm, an abrasive flow rate of 65 kg / min, a high-pressure water nozzle diameter of 3.2 mm, a jet pressure of 75 MPa, a jet angle of 80°, a jet distance of 85 mm, and a running speed of the strip of steel of 4 m / min.

[0025] The abrasive volume is V=0.25πd 3 =0.17mm 3 The water jet power is N=35.1D 2 P 1.5 =233452W When the abrasive particles reach the steel belt, the kinetic energy perpendicular to the steel belt is The spray distance is 85mm, and the diameter of the circular descaling area formed by a single nozzle is 25mm. Abrasive mass consumed per unit area in the strip descaling area Abrasive mass concentration in abrasive water jet

[0026] In summary, the kinetic energy of the abrasive particles perpendicular to the steel belt when they reach the steel belt is 10.89×10 -3 J, above the critical value of 10×10 -3 J; Abrasive flow rate per unit area of ​​strip steel 10.83kg / m 3 , higher than the critical value of 9.5kg / m 3 The abrasive mass concentration is 30.92%, which is lower than the critical value of 35%. The surface cleanliness after descaling reaches Sa3 level, and the oxide layer and dechromized layer are completely removed. Therefore, this set of process parameter design meets the requirements of cold stainless steel.

[0027] Embodiment 2

[0028] The abrasive is made of martensitic stainless steel particles with a particle size of 0.8 mm, an abrasive flow rate of 120 kg / min, a high-pressure water nozzle diameter of 4 mm, a jet pressure of 90 MPa, a jet angle of 75°, a jet distance of 100 mm, and a running speed of the strip of steel of 7 m / min.

[0029] The abrasive volume is V=0.25πd 3 =0.4mm 3 The water jet power is N=35.1D 2 P 1.5 =606870W The kinetic energy of the abrasive particles when they reach the steel belt is The spray distance is 100 mm, and the diameter of the circular descaling area formed by a single nozzle is 30 mm. Abrasive mass consumed per unit area in the strip descaling area Abrasive mass concentration in abrasive water jet

[0030] In summary, the kinetic energy of the abrasive particles perpendicular to the steel belt when they reach the steel belt is 31.59×10 -3 J, above the critical value of 10×10 -3 J; Abrasive flow rate per unit area of ​​strip steel 9.52kg / m 3 , higher than the critical value of 9.5kg / m 3 The abrasive mass concentration is 29.75%, which is lower than the critical value of 35%. The surface cleanliness after descaling reaches Sa3 level, and the oxide layer and dechromized layer are completely removed. Therefore, this set of process parameter design meets the requirements of cold stainless steel.

[0031] Comparative Example 1

[0032] The abrasive is made of martensitic stainless steel particles with a particle size of 0.5 mm, an abrasive flow rate of 60 kg / min, a high-pressure water nozzle diameter of 3.4 mm, a jet pressure of 80 MPa, a jet angle of 85°, a jet distance of 80 mm, and a running speed of the strip of steel of 4 m / min.

[0033] The abrasive volume is V=0.25πd 3 =0.1mm 3 The water jet power is N=35.1D 2 P 1.5 =290335W The kinetic energy of the abrasive particles when they reach the steel belt is The spray distance is 80mm, and the diameter of the circular descaling area formed by a single nozzle is 25mm. The abrasive flow rate per unit area of ​​strip steel is Abrasive mass concentration in abrasive water jet

[0034] In summary, the kinetic energy of the abrasive particles perpendicular to the steel belt when they reach the steel belt is 7.19×10 -3 J, below the critical value of 10×10 -3 J; Abrasive flow rate per unit area of ​​strip steel 10kg / m 3 , higher than the critical value of 9.5kg / m 3 The abrasive mass concentration is 19.96%, which is lower than the critical value of 35%, and the surface has a residual dechromed layer after descaling. Therefore, this group of process parameter design does not meet the requirements of cold stainless steel.

[0035] Comparative Example 2

[0036] The abrasive is made of martensitic stainless steel particles with a particle size of 0.6 mm, an abrasive flow rate of 56 kg / min, a high-pressure water nozzle diameter of 3.2 mm, a jet pressure of 75 MPa, a jet angle of 80°, a jet distance of 88 mm, and a running speed of the strip of steel of 4 m / min.

[0037] The abrasive volume is V=0.25πd 3 =0.17mm 3 The water jet power is N=35.1D 2 P 1.5 =233452W The kinetic energy of the abrasive particles when they reach the steel belt is The spray distance is 88mm, and the diameter of the circular descaling area formed by a single nozzle is 26mm. The abrasive flow rate per unit area of ​​strip steel is Abrasive mass concentration in abrasive water jet

[0038] In summary, the kinetic energy of the abrasive particles perpendicular to the steel belt when they reach the steel belt is 11.29×10 -3 J, above the critical value of 10×10 -3 J; Abrasive flow rate per unit area of ​​strip steel 8.97kg / m 3 , below the critical value of 9.5kg / m 3 The abrasive mass concentration is 30.07%, which is lower than the critical value of 35%, and the chromium removal layer remains on the surface after descaling. Therefore, this group of process parameter design does not meet the requirements of cold stainless steel.

[0039] Comparative Example 3

[0040] The abrasive is made of martensitic stainless steel particles with a particle size of 0.7 mm, an abrasive flow rate of 90 kg / min, a high-pressure water nozzle diameter of 3.5 mm, a jet pressure of 80 MPa, a jet angle of 80°, a jet distance of 90 mm, and a running speed of the strip of steel of 6 m / min.

[0041] The abrasive volume is V=0.25πd 3 =0.27mm 3 The water jet power is N=35.1D2 P 1.5 =307665W The kinetic energy of the abrasive particles when they reach the steel belt is The spray distance is 90 mm, and the diameter of the circular descaling area formed by a single nozzle is 26 mm. The abrasive flow rate per unit area of ​​strip steel is Abrasive mass concentration in abrasive water jet

[0042] In summary, the kinetic energy of the abrasive particles perpendicular to the steel belt when they reach the steel belt is 17.89×10 -3 J, above the critical value of 10×10 -3 J; Abrasive flow rate per unit area of ​​strip steel 9.62kg / m 3 , higher than the critical value of 9.5kg / m 3 The abrasive mass concentration is 39.11%, which is lower than the critical value of 35%, and the surface has a residual dechromed layer after descaling. Therefore, this group of process parameter design does not meet the requirements of cold stainless steel.

[0043] The above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. A parameter design method for green, low-cost, high-quality descaling technology suitable for cold stainless steel, characterized in that: By selecting the abrasive particle size d, abrasive flow rate Q, high-pressure water nozzle diameter D, jet pressure P, jet angle θ, jet distance h and running speed v of the steel strip, the kinetic energy component E of the abrasive particles perpendicular to the steel strip surface exceeds 10×10 -3 J. The abrasive mass per unit area of ​​the strip descaling area exceeds 9.5 kg / m 3 , the abrasive mass concentration C in the abrasive water jet does not exceed 35%, thereby ensuring high-efficiency abrasive water jet descaling on the stainless steel surface; Wherein, the kinetic energy component E is calculated by the following formula I: In formula I, V is the volume of the abrasive particles, mm 3 ; ρ is the density of abrasive particles in g / cm 3 ; N is the water jet power, W; Q 水 is the water jet flow rate, kg / min; Q is the abrasive flow rate, kg / min; θ is the injection angle, °; D is the diameter of the high-pressure water nozzle, mm; P is the jet pressure, MPa; The water jet power N in formula I is calculated by the following formula II: In formula II, Q 水 is the water jet flow rate, kg / min; P is the jet pressure, MPa; D is the diameter of the high-pressure water nozzle, mm; The abrasive mass m consumed per unit area in the strip descaling region is calculated by the following formula III: In formula III, v is the running speed of the strip, m / min; D 除 is the diameter of the circular descaling area formed by a single nozzle, mm; The diameter D of the circular descaling area formed by the single nozzle in formula III is 除 Calculated by the following formula IV: In formula IV, h is the injection distance, mm; The abrasive mass concentration C in the abrasive water jet is calculated by the following formula V: Q in V 水 is the water jet flow rate, kg / min; Q is the abrasive flow rate, kg / min; P is the jet pressure, MPa; D is the diameter of the high-pressure water nozzle, mm.

2. The parameter design method according to claim 1, characterized in that: The abrasive particles are martensitic stainless steel particles, which are short cylindrical in shape, and the particle volume V is calculated by the following formula VI: V=0.25πd 3 (VI) In formula VI, d is the particle size of the martensitic stainless steel particles, mm.

3. The parameter design method according to claim 1, characterized in that: The abrasive particles are martensitic stainless steel particles in the shape of short rods with a Vickers hardness of 440 HV; the abrasive particle size d is 0.6 to 0.8 mm, the abrasive flow rate Q is 60 to 120 kg / min, the high-pressure water nozzle diameter D is 3 to 4 mm, the jet pressure P is 70 to 90 MPa, the jet angle θ is 75° to 85°, the jet distance h is 80 to 100 mm, and the running speed v of the strip steel is 4 to 7 m / min.

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