CN115032095A - Method for rapidly judging cold rolling brittleness of oriented silicon steel normalized plate - Google Patents
Method for rapidly judging cold rolling brittleness of oriented silicon steel normalized plate Download PDFInfo
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- 238000005097 cold rolling Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 44
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 19
- 238000005452 bending Methods 0.000 claims abstract description 59
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 238000007619 statistical method Methods 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000005554 pickling Methods 0.000 claims description 6
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000010606 normalization Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000035929 gnawing Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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Abstract
The application provides a method for rapidly judging cold rolling brittleness of an oriented silicon steel normalizing plate, which belongs to the technical field of oriented silicon steel materials, the method comprises the steps of randomly sampling when the tail of a normalizing unit is coiled, sampling in the middle of the plate and broken edge wires on two sides of the plate respectively for each coil, sampling along rolling direction, performing bending test on the broken edge wires under the condition that the temperature of a sample is normal temperature, recording the bending times of each broken edge wire pattern, counting the brittle failure conditions of steel coils corresponding to the sampling in a cold rolling process, performing corresponding statistical analysis on the bending test results and the cold rolling brittle failure conditions, judging whether the bending times of the sample on the edge of the normalizing plate is more than or equal to 1 time, and if not, judging the cold rolling brittle failure. The minimum recurvation times of the normalizing plate are determined by detecting the recurvation times of the normalizing plate under different normalizing process conditions, verifying the cold rolling rollability under the premise of different bending times and finding out the corresponding relation between the bending times and the rollability, so that the cold rolling brittleness is judged.
Description
Technical Field
The application relates to the technical field of oriented silicon steel materials, in particular to a method for quickly judging cold rolling brittleness of an oriented silicon steel normalizing plate.
Background
The oriented silicon steel is a brittle material with high silicon content (> 3%), and has high processing difficulty. The main production flow comprises steel making, continuous casting, hot rolling, acid washing (normalizing treatment if necessary), cold rolling, decarburization annealing, high-temperature annealing, stretching and flattening and the like, wherein the cold rolling is the process with the highest processing difficulty. The oriented silicon steel of the company needs pickling normalizing annealing, and the annealing process has great influence on cold rolling performance and often causes brittle fracture. A large amount of intermediate waste products and failure shutdown are caused due to belt breakage, so that the yield is reduced, the energy consumption is increased, and the manufacturing cost is increased. Due to the lack of effective detection means, the rollability of the produced normalizing plate cannot be confirmed when the acid pickling normalizing unit is produced again after being shut down, whether the process is adjusted in place can be confirmed only by repeatedly adjusting the normalizing process and then trial rolling, and the process adjustment can be implemented only when batch strip breakage occurs in cold rolling.
The cold rolling performance is influenced by more factors, including material (component) factors, metallographic structure factors, material edge defect factors and the like. If the judgment is carried out through microscopic analysis and detection, the time consumption is long, the representativeness of sampling detection is poor due to the nonuniformity of components and tissues, and even if the detection is accurate, the improvement of the production process cannot be guided in time.
Disclosure of Invention
In order to make up for the defects, the application provides a method for quickly judging cold rolling brittleness of an oriented silicon steel normalized plate, aims to solve the problems that the representativeness of sampling detection is poor, and even if the detection is accurate, the improvement of a production process cannot be guided in time.
The application is realized as follows: the application provides a method for rapidly judging cold rolling brittleness of an oriented silicon steel normalized plate, which comprises the following steps:
randomly sampling when the tail part of the normalizing unit is coiled, wherein each coil respectively samples the scrap edge wires in the middle and at two sides of the plate, and respectively samples along the rolling direction;
under the condition that the temperature of the sample is normal temperature, bending test is carried out on the broken edge wires, and the bending times of each broken edge wire sample are recorded;
counting the brittle failure condition of the steel coil corresponding to the sampling in the cold rolling process;
carrying out corresponding statistical analysis on the bending experiment result and the cold rolling brittle failure condition;
whether the bending times of the sample at the edge of the normalizing plate is more than or equal to 1 time or not is judged; and
if not, judging cold rolling brittle fracture.
Preferably, the method also comprises a cold rolling brittle fracture sample temperature raising and bending test:
placing test samples under different temperature conditions for heat preservation;
testing 3 samples at each temperature level, and taking the mean value of the bending times to represent the bending performance;
whether the mean value of the recurvation times is more than or equal to 2 times or not is judged; and
if not, the unqualified coil is bent reversely.
Preferably, the method for disposing the unqualified coil based on the cold rolling brittle fracture sample temperature raising and reverse bending test comprises the following steps:
before the pickling normalizing unit is started and heated every time, unqualified coils for bending test are developed;
under the condition that the furnace temperature is less than 350 ℃, the unqualified coil is subjected to a through plate bending test again;
opening a flame heater before tail coiling, and adjusting the output quantity of natural gas to ensure that the coiling temperature is greater than or equal to 60 ℃;
the coil failing the bending test was cold rolled within 1 hour after the relief treatment.
Preferably, when the tail part of the normalizing unit is coiled, the steel coil is subjected to sample collection on the scrap edge wires on two sides, and the samples on two sides are respectively marked.
Preferably, the normal temperature is 20-40 ℃.
Preferably, the sample is incubated for 20 minutes based on different temperature conditions.
The beneficial effect of this application is: according to the method for rapidly judging the cold rolling brittleness of the oriented silicon steel normalizing plate, which is designed, when the method is used, the normalizing plate is subjected to repeated bending detection, and the cold rolling rollability is represented by the number of times of reverse bending. The technical scheme is as follows: and detecting the recurvation times of the normalized plate under different normalization process conditions, verifying the cold rolling rollability under the premise of different recurvation times, and finding out the corresponding relation between the recurvation times and the rollability, thereby determining the minimum recurvation times of the normalized plate as the control standard of the production process of the acid washing normalization process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also derive other related drawings based on these drawings without inventive effort.
Fig. 1 is a schematic diagram of the number of repeated bending at different temperatures according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
According to conventional practice, checking the mechanical properties of steel sheets can be solved by tensile tests. However, because the silicon content of the oriented silicon steel is high, the normalizing plate presents obvious brittle characteristics during stretching, and the tensile strength, the yield strength and the elongation rate cannot be accurately detected.
Moreover, in order to prevent cold rolling strip breakage, the following conventional methods are generally adopted:
1) carrying out appearance inspection on the hot-rolled original plate, mainly confirming whether defects such as edge cracks, brittle edges, scabs and the like exist, and carrying out edge shearing treatment when the defects are found;
2) inspecting the quality of the edge after edge shearing, and judging whether the edge shearing defects such as edge gnawing, excessive burrs and the like exist or not, if so, performing repair treatment;
3) continuously optimizing cold rolling operation, and avoiding strip breakage caused by improper rolling process and operation;
4) and (4) confirming chemical components to see whether the brittle failure risk with the overproof silicon content exists.
However, since the detection of the rollability after the normalization annealing is still not preferable, the detection of the rollability embrittlement can be performed according to the following scheme.
The application provides a technical scheme: a method for rapidly judging cold rolling brittleness of an oriented silicon steel normalized plate specifically comprises the following steps:
randomly sampling when the tail part of the normalizing unit is coiled, wherein each coil respectively samples scrap edge wires in the middle and two sides of a plate, and respectively samples along the rolling direction;
under the condition that the temperature of the sample is normal temperature, bending test is carried out on the broken edge wires, and the bending times of each broken edge wire sample are recorded;
counting the brittle failure condition of the steel coil corresponding to the sampling in the cold rolling process;
carrying out corresponding statistical analysis on the bending experiment result and the cold rolling brittle failure condition;
according to whether the bending times of the sample at the edge part of the normalizing plate is more than or equal to 1 time or not; and
if not, judging cold rolling brittle fracture.
In the specific setting, it needs to be noted that, when the tail part of the normalizing unit is coiled, the broken edge wires at two sides of the steel coil are respectively sampled one by one, the samples at two sides are respectively marked with a marking pen, namely the side A of the steel coil number and the side B of the steel coil number, and then the sampled samples are sent to a quality monitoring station for the recurvation test, and further, when the test result is more than or equal to 1 time, the process adjustment is not needed; otherwise, the quality inspector should immediately notify the technical department to perform the normalized process adjustment, and the steel coil with unqualified bending test is immediately sealed to wait for the subsequent disposal.
According to the long-time detection and cold rolling tracking, the corresponding statistics of the bending test result and the cold rolling brittle failure condition are as follows:
the normalization plate millability standard can be determined, and the following conclusion can be reached:
(1) at normal temperature, as long as the bending times of the samples at the edge of the normalized plate are less than 1 time, cold rolling brittle fracture can be caused;
(2) the bending properties in the middle of the normalizing plate do not affect the rollability.
Specifically, the normal temperature is set to be between 20 ℃ and 40 ℃,
in order to further optimize the technical scheme, the method further comprises a cold rolling brittle fracture sample temperature raising and bending test on the basis of the embodiment:
placing test samples under different temperature conditions for heat preservation;
testing 3 samples at each temperature level, and taking the mean value of the bending times to represent the bending performance;
whether the mean value of the recurvation times is more than or equal to 2 times or not is judged; and
if not, the unqualified coil is bent reversely.
And in the specific setting, it should be noted that each pair of 3 samples can be insulated for 20min at the experimental temperature of 20 ℃, 40 ℃, 60 ℃, 80 ℃, 100 ℃ and 120 ℃, then the detection is carried out according to the national standard GB/T235-1999, and the average value of the 3 samples is tested at each temperature level to represent the reverse bending performance, as shown in figure 1, the result shows that the average value is more than or equal to 2 times, the product is qualified, and the product is unqualified on the contrary, meanwhile, the field cold rolling requirement can be met when the temperature reaches 60 ℃, the reverse bending frequency starts to be obviously improved when the temperature reaches 80 ℃, and the product tends to be stable when the temperature reaches 100 ℃.
In order to further optimize the technical scheme, on the basis of the embodiment, the method for disposing the unqualified coil based on the cold rolling brittle fracture sample temperature raising and bending-back test comprises the following steps:
before the pickling normalizing unit is started and heated every time, unqualified coils for bending test are developed;
under the condition that the furnace temperature is less than 350 ℃, the unqualified coil is subjected to a through plate bending test again;
opening a flame heater before tail coiling, and adjusting the output quantity of natural gas to ensure that the coiling temperature is greater than or equal to 60 ℃;
after the coil failing the bending test is salvaged, it should be cold rolled within 1 hour.
In addition, in the specific setting, it should be noted that, when the coil with the unqualified bending test is disposed, the coil can be disposed according to the disposing method of the unqualified coil in the cold rolling brittle fracture sample temperature raising and reverse bending test, the unqualified coil can be rescued again, then the cold rolling operation is performed within 1 hour, and in order to avoid the temperature reduction of the process transportation, the coiling temperature can reach 80 ℃.
Specifically, the method is implemented on site, the cogging and strip breakage rate of the rolling mill can be greatly reduced from 5.5% to 1.5%, the yield is improved from 95.2% to 97.1%, and the working efficiency is greatly improved.
Specifically, the working principle of the method for rapidly judging the cold rolling brittleness of the oriented silicon steel normalized plate is as follows: when the device is used, the normalized plate is subjected to repeated bending detection, and the cold rolling performance is represented by the number of times of reverse bending. The technical scheme is as follows: detecting the recurvation times of the normalizing plate under different normalizing process conditions, verifying the cold rolling rollability under the premise of different recurvation times, and finding out the corresponding relation between the recurvation times and the rollability, thereby determining the minimum recurvation times of the normalizing plate as the control standard of the production process of the acid washing normalizing procedure;
firstly, sampling two sides and the middle part of a steel coil at the normal temperature of 20-40 ℃, then carrying out reverse bending test on the sample, and determining the judgment of the rolling performance standard through different combined bending times of three parts, thereby obtaining the conclusion that the cold rolling brittle fracture can be caused as long as the bending times of the sample at the edge part of the normalizing plate is less than 1 time at the normal temperature, and the bending performance of the middle part of the normalizing plate does not influence the rolling performance;
in the test, the steel coil with brittle fracture can be further detected to be unqualified coil in the steel coil by raising the temperature, specifically, the bending resistance can be represented by respectively measuring the average values of 3 samples at different temperatures, when the average value is more than or equal to 2, the steel coil is qualified coil, otherwise, the steel coil is unqualified coil;
further, the unqualified coil is reprocessed by a method for disposing the unqualified coil, the unqualified coil in the bending test can be rescued before the acid pickling normalizing unit is started and heated every time, then the unqualified coil is subjected to the plate passing bending test again under the condition that the furnace temperature is lower than 350 ℃, a flame heater before tail coiling is further opened, the output quantity of natural gas is adjusted, the coiling temperature is more than 80 ℃ (more than or equal to 60 ℃, the temperature drop of process transportation is considered at the position), and the unqualified coil in the bending test is subjected to the rescue treatment and then is subjected to cold rolling treatment within 1 hour;
the method is implemented on site, the cogging and strip breakage rate of the rolling mill can be greatly reduced from 5.5% to 1.5%, the yield is improved from 95.2% to 97.1%, and the working efficiency is greatly improved.
It should be noted that the specific model specifications of the normalizing unit, the acidification normalizing unit and the flame heater need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.
The power supply and the principle of the normalizing unit, the acidification normalizing unit and the fired heater are clear to those skilled in the art and will not be described in detail here.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A method for rapidly judging cold rolling brittleness of an oriented silicon steel normalized plate is characterized by comprising the following steps:
randomly sampling when the tail part of the normalizing unit is coiled, wherein each coil respectively samples the scrap edge wires in the middle and at two sides of the plate, and respectively samples along the rolling direction;
under the condition that the temperature of the sample is normal temperature, bending test is carried out on the broken edge wires, and the bending times of each broken edge wire sample are recorded;
counting the brittle failure condition of the steel coil corresponding to the sampling in the cold rolling process;
carrying out corresponding statistical analysis on the bending experiment result and the cold rolling brittle fracture condition;
according to whether the bending times of the sample at the edge part of the normalizing plate is more than or equal to 1 time or not; and
if not, judging cold rolling brittle fracture.
2. The method for rapidly judging the cold rolling brittleness of the normalized oriented silicon steel plate as claimed in claim 1, further comprising the step of performing a cold rolling brittleness sample temperature raising and reverse bending test:
placing test samples under different temperature conditions for heat preservation;
testing 3 samples at each temperature level, and taking the mean value of the bending times to represent the bending performance;
whether the mean value of the recurvation times is more than or equal to 2 times or not is judged; and
if not, the unqualified coil is bent reversely.
3. The method for rapidly judging the cold rolling brittleness of the oriented silicon steel normalized sheet according to claim 2, wherein the handling method of the unqualified coil based on the cold rolling brittleness-test sample temperature raising and reverse bending test comprises the following steps:
before the pickling normalizing unit is started and heated every time, unqualified coils for bending test are developed;
under the condition that the furnace temperature is less than 350 ℃, the unqualified coil is subjected to a through plate bending test again;
opening a flame heater before tail coiling, and adjusting the output quantity of natural gas to ensure that the coiling temperature is greater than or equal to 60 ℃;
the coil failing the bending test was cold rolled within 1 hour after the relief treatment.
4. The method as claimed in claim 1, wherein during the coiling at the tail of the normalizing unit, samples are taken from the steel coil at the scrap wires at two sides, and the samples at two sides are respectively marked.
5. The method for rapidly judging the cold rolling brittleness of the normalized sheet of oriented silicon steel according to claim 1, wherein the normal temperature is 20-40 ℃.
6. The method for rapidly judging the cold rolling brittleness of the normalized oriented silicon steel plate as claimed in claim 2, wherein the sample is subjected to heat preservation for 20 minutes based on different temperature conditions.
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Citations (7)
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|---|---|---|---|---|
| JPH0578741A (en) * | 1991-09-25 | 1993-03-30 | Kawasaki Steel Corp | Method for preventing ear cracking in cold rolling of silicon steel sheet |
| KR20020051073A (en) * | 2000-12-22 | 2002-06-28 | 이구택 | Test method for brittle fracture of cold rolled steel sheet after forming |
| JP2008046106A (en) * | 2006-07-19 | 2008-02-28 | Nippon Steel Corp | System for controlling quality of brittle crack propagation arrest properties of thick steel plate |
| CN201083660Y (en) * | 2007-09-24 | 2008-07-09 | 宝山钢铁股份有限公司 | Band steel bending test apparatus |
| CN101726441A (en) * | 2008-10-21 | 2010-06-09 | 北京有色金属研究总院 | Method for detecting low-temperature brittleness of zinc anode ribbon |
| CN202599745U (en) * | 2012-04-26 | 2012-12-12 | 宝山钢铁股份有限公司 | Automatic recurvation device capable of preheating strip steel sample |
| CN113020278A (en) * | 2021-03-05 | 2021-06-25 | 武汉钢铁有限公司 | Method for prejudging cold rolling brittle failure occurrence of oriented silicon steel |
-
2021
- 2021-12-13 CN CN202111514458.5A patent/CN115032095A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0578741A (en) * | 1991-09-25 | 1993-03-30 | Kawasaki Steel Corp | Method for preventing ear cracking in cold rolling of silicon steel sheet |
| KR20020051073A (en) * | 2000-12-22 | 2002-06-28 | 이구택 | Test method for brittle fracture of cold rolled steel sheet after forming |
| JP2008046106A (en) * | 2006-07-19 | 2008-02-28 | Nippon Steel Corp | System for controlling quality of brittle crack propagation arrest properties of thick steel plate |
| CN201083660Y (en) * | 2007-09-24 | 2008-07-09 | 宝山钢铁股份有限公司 | Band steel bending test apparatus |
| CN101726441A (en) * | 2008-10-21 | 2010-06-09 | 北京有色金属研究总院 | Method for detecting low-temperature brittleness of zinc anode ribbon |
| CN202599745U (en) * | 2012-04-26 | 2012-12-12 | 宝山钢铁股份有限公司 | Automatic recurvation device capable of preheating strip steel sample |
| CN113020278A (en) * | 2021-03-05 | 2021-06-25 | 武汉钢铁有限公司 | Method for prejudging cold rolling brittle failure occurrence of oriented silicon steel |
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Application publication date: 20220909 |