CN-122007181-A - Treatment process for eliminating transverse fold defect on stainless steel surface of hot rolled broadband sheet

CN122007181ACN 122007181 ACN122007181 ACN 122007181ACN-122007181-A

Abstract

The invention discloses a treatment process for eliminating transverse fold defects on the surface of a hot rolled broadband sheet stainless steel, which comprises the specific process steps of 1) heating, 2) descaling by high-pressure water, 3) rough rolling, 4) finish rolling, 5) laminar cooling, 6) coiling, wherein cooling equipment in the step 5) comprises a water retaining mechanism, an edge shielding mechanism, a laminar cooling mechanism, a water receiving tank and a correction mechanism, the correction mechanism is arranged at one end of the water receiving tank, a plurality of edge shielding mechanisms are symmetrically arranged at two sides of the water receiving tank, the laminar cooling mechanisms are fixedly connected to the water receiving tank at equal intervals, and the water retaining mechanism is provided with a plurality of edge shielding mechanisms which are respectively and fixedly connected to one side of the laminar cooling mechanism. The invention controls the water retaining mechanism in the cooling equipment to locally shield and guide the laminar cooling mechanism, and solves the problem of uneven transverse temperature of the broadband sheet stainless steel by reducing the local cooling strength.

Inventors

ZHAO WEI
LIU LONGXIANG
Shao Zerong
Tang Shaoxin
JIANG WEI

Assignees

山东盛阳金属科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260321

Claims (7)

1. The treatment process for eliminating the transverse fold defect on the surface of the hot rolled broadband sheet stainless steel is characterized by comprising the following specific process steps: 1) The heating step comprises a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is controlled to be 750-850 ℃, the temperature of the first heating section is controlled to be 1050-1150 ℃, the temperature of the second heating section is controlled to be 1180-1250 ℃, the temperature of the soaking section is controlled to be 1200-1280 ℃, and the furnace pressure is controlled to be 20-40pa; 2) The high-pressure water descaling, namely removing the oxide skin on the surface of the heated billet by using 18-22 MPa high-pressure water, so as to prevent the oxide skin from adversely affecting the surface quality of the billet in the rolling process; 3) The rough rolling comprises the steps of rapidly conveying a billet to a rough rolling mill through a conveying device with a heat preservation cover, carrying out 7-pass rolling on the billet during rough rolling, wherein the rolling speed is 2-3.5m/s, the first-pass rolling reduction is 20-25%, the second-pass rolling reduction is 25-30%, the third-pass rolling reduction is 28-33%, the fourth-pass rolling reduction is 25-30%, the fifth-pass rolling reduction is 20-25%, the sixth-pass rolling reduction is 15-20%, and the seventh-pass rolling reduction is 10-15%; 4) Finish rolling, namely, hot continuous rolling is adopted, a rough rolled billet is conveyed into a finish rolling mechanism to be rolled into a wide-band sheet stainless steel, finish rolling is adopted, the speed-up rolling is adopted, the pressure AGC is applied, the finish rolling starting temperature is set to be 1000-1050 ℃, and the finish rolling finishing temperature is set to be 850-920 ℃; 5) The method comprises the steps of carrying out laminar cooling, namely detecting the temperature of the broadband sheet stainless steel through an infrared thermal imaging temperature measuring system in cooling equipment, then reducing the temperature of the broadband sheet stainless steel to 550-650 ℃ through a laminar cooling mechanism, simultaneously controlling the spraying range of the laminar cooling mechanism by matching with a water retaining mechanism, shielding the edge of the broadband sheet stainless steel through an edge shielding mechanism, reducing the difference value of the transverse temperature of the broadband sheet stainless steel, and then correcting the plate shape of the broadband sheet stainless steel through a correcting mechanism; 6) Coiling, namely coiling the broadband sheet stainless steel into a steel coil by using an underground coiling machine.
2. The treatment process for eliminating the transverse fold defect on the surface of the hot rolled broadband sheet stainless steel according to claim 1 is characterized in that the cooling equipment in the step 5) comprises a water retaining mechanism, an edge shielding mechanism, a laminar cooling mechanism, a water receiving tank and a correcting mechanism, wherein the correcting mechanism is arranged at one end of the water receiving tank, a plurality of edge shielding mechanisms are symmetrically arranged at two sides of the water receiving tank, and a plurality of laminar cooling mechanisms are fixedly connected to the water receiving tank at equal intervals; The water retaining mechanism comprises a water tank, connecting columns, guide grooves, a carrier and a water receiver, wherein the guide grooves are fixedly connected to the bottom of the water tank, one ends of the connecting columns are fixedly connected with two ends of the water tank respectively, the other ends of the connecting columns are fixedly connected with the laminar flow cooling mechanism, the carrier is positioned on one side of the water tank and connected with the guide grooves, and the water receiver is positioned above the water tank and is in sliding connection with the top of the carrier.
3. The treatment process for eliminating the transverse fold defect on the surface of the hot rolled wide-band sheet stainless steel is characterized in that a protective box I, a guide box, a sliding rod, a spring, a motor I, a motor II, a gear, a chain wheel I, a chain wheel II and a roller are arranged on the carrier, one side of the protective box I is in sliding connection with the guide groove, the motor I and the motor II are fixedly connected in the protective box I through a connecting seat, the output end of the motor I passes through a through hole in the top of the protective box I and is fixedly connected with the gear, one side of the chain wheel I and one side of the chain wheel II are fixedly connected with the roller arranged in the guide groove through a connecting shaft, the other side of the chain wheel I is in rotating connection with the protective box I through the connecting shaft, the other side of the chain wheel II passes through a through hole in the protective box I and is fixedly connected with the output end of the motor II through a chain, the guide box I is provided with a pair of the guide boxes, one ends of the sliding rod are respectively in sliding connection with the guide box I, the spring is provided with a pair of the guide boxes, and the spring is arranged in the guide box along the sliding rod.
4. The treatment process for eliminating the transverse fold defect of the surface of the hot rolled broadband sheet stainless steel is characterized in that the water receiver is provided with a connecting plate I, a telescopic groove, guide pipes, a sliding plate, racks, a connecting plate II, a protection box I, an electric pushing cylinder I, a connecting plate III, an electric pushing cylinder II and a baffle plate, two ends of the sliding plate are in sliding connection with the guide box through the sliding grooves, two sides of the telescopic groove are fixedly connected with a pair of connecting plates I which are in sliding connection with the sliding plate, one ends of the guide pipes are respectively in sliding connection with the connecting plates I, the racks are positioned below the telescopic groove and fixedly connected with the sliding plate, the racks are meshed with gears, the electric pushing cylinder II is provided with a pair of guide pipes, a cylinder body of the electric pushing cylinder II is respectively fixedly connected with the protecting box I arranged on the outer walls of the guide pipes through connecting seats, the extending end of the electric pushing cylinder II is fixedly connected with one end of the connecting plate II through the through holes of the protection box I, one end of the baffle plate is respectively in sliding connection with the guide pipes, the other end of the baffle plate I is fixedly connected with the connecting plate II, the cylinder body of the electric pushing cylinder I is provided with a pair of electric pushing cylinder I, the cylinder body of electric pushing body I is fixedly connected with one side of the connecting plate I through the connecting seat of a pair of guide plates I respectively through the connecting seat.
5. The process for eliminating the transverse fold defect on the stainless steel surface of the hot rolled broadband sheet according to claim 2, wherein the discharging end of the water receiving tank is provided with a squeezing roller, the feeding end is provided with a pinch roller, the side wall is provided with a water outlet, a plurality of conveying rollers are arranged inside the water receiving tank, the correction mechanism is arranged on the outer side of the discharging end of the water receiving tank, and the infrared thermal imaging temperature measuring system is positioned on one side of the pinch roller and fixedly connected with the water receiving tank.
6. The treatment process for eliminating the transverse fold defect on the surface of the hot rolled broadband sheet stainless steel is characterized in that the edge shielding mechanism comprises an electric pushing cylinder III, a water baffle and rotating rollers, wherein the electric pushing cylinder III is provided with a pair of electric pushing cylinders, the cylinder bodies of the pair of electric pushing cylinders III are fixedly connected with a water receiving tank through connecting seats, the extending ends of the electric pushing cylinders penetrate through holes in the water receiving tank and are fixedly connected with the water baffle, and the rotating rollers are provided with a plurality of rotating rollers and are equidistantly and rotatably connected to the inner side of the water baffle.
7. The treatment process for eliminating the transverse fold defect of the stainless steel surface of the hot rolled broadband sheet according to claim 2, wherein the laminar cooling mechanism comprises an upper header, a lower header and supporting columns, wherein two ends of the upper header are respectively and fixedly connected with the tops of a pair of supporting columns, the lower header is positioned in a water receiving tank and is fixedly connected with the bottoms of the pair of supporting columns, the other ends of the pair of connecting columns are respectively and fixedly connected with the pair of supporting columns, and a connecting flange at one end of the upper header and one end of the lower header are fixedly connected with cooling equipment through a conveying pipeline.

Description

Treatment process for eliminating transverse fold defect on stainless steel surface of hot rolled broadband sheet Technical Field The invention belongs to the technical field of hot rolling, and particularly relates to a treatment process for eliminating transverse fold defects on the surface of a stainless steel of a hot rolled broadband sheet. Background In the process of producing hot-rolled stainless steel, uneven cooling temperature, especially lateral temperature difference, of the hot-rolled stainless steel strip can lead to uneven microstructure and mechanical property of the stainless steel strip, and the difference leads to inconsistent deformation of the strip steel during subsequent flattening or stretching, and soft zone materials are pressed and buckled, so that transverse folding defects are caused; By way of retrieval, a hot rolled laminar flow cooling system of prior art publication No. CN118060351A, but the upper and lower cooling headers are typically arranged in segments, discretely, with physical spacing between the headers which can cause fluctuations in cooling intensity of the strip as it passes through these spaced areas, creating a macroscopic periodic lateral temperature differential; Through retrieval, the method for controlling the transverse fold of the hot rolled strip steel has the publication number CN120115539A, and the method combines the principle of phase structure transformation in the application steel by controlling the factors of the temperature difference of the rolled piece in the whole hot rolling process through a system, and eliminates the transverse fold problem caused by the temperature difference of the upper surface and the lower surface of the rolled piece on the basis of not affecting the rolling stability and the surface quality; therefore, a treatment process for eliminating the transverse folding defect on the surface of the stainless steel of the hot rolled broadband sheet is required, and the stainless steel of the broadband sheet can be stably and uniformly cooled, so that the transverse folding defect of the stainless steel of the broadband sheet is prevented. Disclosure of Invention The invention aims to overcome the defects in the prior art, provide a treatment process for eliminating the transverse fold defect of the stainless steel surface of a hot rolled broadband sheet, control a water retaining mechanism in cooling equipment to locally shield and guide a laminar cooling mechanism, and solve the problem of uneven transverse temperature of the stainless steel of the broadband sheet by reducing the local cooling strength. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The treatment process for eliminating the transverse fold defect on the surface of the stainless steel of the hot rolled broadband sheet comprises the following specific process steps: 1) The heating step comprises a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is controlled to be 750-850 ℃, the temperature of the first heating section is controlled to be 1050-1150 ℃, the temperature of the second heating section is controlled to be 1180-1250 ℃, the temperature of the soaking section is controlled to be 1200-1280 ℃, and the furnace pressure is controlled to be 20-40pa; 2) The high-pressure water descaling, namely removing the oxide skin on the surface of the heated billet by using 18-22 MPa high-pressure water, so as to prevent the oxide skin from adversely affecting the surface quality of the billet in the rolling process; 3) The rough rolling comprises the steps of rapidly conveying a billet to a rough rolling mill through a conveying device with a heat preservation cover, carrying out 7-pass rolling on the billet during rough rolling, wherein the rolling speed is 2-3.5m/s, the first-pass rolling reduction is 20-25%, the second-pass rolling reduction is 25-30%, the third-pass rolling reduction is 28-33%, the fourth-pass rolling reduction is 25-30%, the fifth-pass rolling reduction is 20-25%, the sixth-pass rolling reduction is 15-20%, and the seventh-pass rolling reduction is 10-15%; 4) Finish rolling, namely, hot continuous rolling is adopted, a rough rolled billet is conveyed into a finish rolling mechanism to be rolled into a wide-band sheet stainless steel, finish rolling is adopted, the speed-up rolling is adopted, the pressure AGC is applied, the finish rolling starting temperature is set to be 1000-1050 ℃, and the finish rolling finishing temperature is set to be 850-920 ℃; 5) The method comprises the steps of carrying out laminar cooling, namely detecting the temperature of the broadband sheet stainless steel through an infrared thermal imaging temperature measuring system in cooling equipment, then reducing the temperature of the broadband sheet stainless steel to 550-650 ℃ through a laminar cooling mechanism, simultaneous