CN104087731B - A kind of restorative procedure of not flattened fault IF steel mechanical property - Google Patents
A kind of restorative procedure of not flattened fault IF steel mechanical property Download PDFInfo
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- CN104087731B CN104087731B CN201410348709.0A CN201410348709A CN104087731B CN 104087731 B CN104087731 B CN 104087731B CN 201410348709 A CN201410348709 A CN 201410348709A CN 104087731 B CN104087731 B CN 104087731B
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Abstract
The restorative procedure of a kind of not flattened fault IF steel mechanical property: the fault coil of strip that will repair carries out uncoiling on uncoiler, and part undesirable in coil of strip is wiped out；Adopting the bending roll group of seven-roll Abramsen machine and the working roll of smoothing roll group that steel plate is rolled, control the pressure degree of depth of bending section at 9 ~ 11mm, the pressure degree of depth of straightening section is at 9 ~ 11mm, and unit operation speed is at 90 ~ 110m/min；Shield during this period and by the position sensor in seven-roll Abramsen machine；Batching, coiling tension is at 35 ~ 45N/mm2.The mechanical property of the gapless atomic steel that the not flattened mechanical property of energy drawn straightener reparation of the present invention is inferior so that it is becoming and give up as qualified products, mechanical property meets requirement, thus increasing qualification rate, reducing production cost, economizing on resources.
Description
Technical field
The present invention relates to the restorative procedure of a kind of mechanical property of steel plate, specifically belong to the restorative procedure of a kind of not flattened fault IF steel mechanical property, it is more suitable for thickness at 0.2-2.5mm definitely, and width is at the restorative procedure of the not flattened fault IF steel mechanical property of 800-2000mm.
Background technology
IF steel is also known as gapless atomic steel, in this steel, owing to C, N content are low, adding after a certain amount of Ti, Nb, making the C in steel, atom N be fixed to as carbide and nitride, so that the existence of atom very close to each other in steel, therefore be called gapless atomic steel, i.e. IF steel.IF steel plate has the deep drawability such as low yield point and yield tensile ratio, high elongation rate, high plastic strain ratio, high work hardening index, and has without ageing.
External expert was just it has been proposed that at the end of the sixties in last century in 1949 for gapless atomic steel scheme the earliest, and along with vacuum degassing technology application in metallurgical production, this steel grade starts to produce, but the only structure of a small amount of deformation complexity for automobile on.After 1980, various countries' metallurgical technology starts to develop rapidly, and gapless atomic steel starts progressively to be applied to integral body and manufactures.
Owing to automobile Interstitial Atom Free Sheet Steel thickness is typically between 0.6-1.5mm, width is between 1200-2000mm, and therefore this series products all produces at continuous annealing unit.A planisher it is provided with after continuous annealing unit is typically in annealing furnace, rely on the jockey pulley before and after frame and leveling roll group that strip steel produces certain elongation percentage and drafts, carry out the intensity to strip steel and produce certain raising, and eliminate yield point elongation, reach the final mechanical property requirements of product.The planisher system operation troubles that occurs now and then and continuous annealing unit is in operation, and whole unit cannot shut down process owing to furnace temperature is higher.Therefore, the product that part is not flattened is often produced.This series products is not due to flattened, therefore is unable to reach the standard of mechanical property, causes and scraps or process as defect ware, causes that qualification rate declines, cost increase.And for this type of defect ware, due to Interstitial Atom Free Sheet Steel, namely intensity is low, steel is soft, when being reprocessed by planisher after heating then through annealing furnace, steel plate in stove can be made to produce fold and scrap or broken belt, so cannot be carried out annealing and smooth process again.
Up to the present, both at home and abroad for this because the inferior gapless atomic steel of abnormal not flattened mechanical property is mainly exactly to scrap.
Through consulting pertinent literature and patent, all find no production technology and the technical scheme of effect.Some producers have in early days and adopt single stand skin pass mill unit to carry out repairing, but it is for the width steel band at below 1300mm, it is impossible to realize the smooth again reparation of gapless atomic steel to more than the 1300mm wide cut that Automobile Plate uses.
Finished steel plate mechanical property reparation for gapless atomic steel refers under the premise of the surface quality and apparent size that do not affect product so that it is mechanical property reaches the scope that product sets.
Stretch-bend leveller equipment is the requirement of the template glacing flatness for adapting to strip of steel plate high request, its work characteristics is to make band produce plastic elongation under the synergy of the continuous alternate repetition bending of jockey pulley and bending roll and obtain strip aligning, can eliminate the ternary shape defects such as the song that wafts of strip steel, edge shape wave and camber.
Summary of the invention
The present invention is directed to prior art and the gapless atomic steel that not flattened mechanical property is inferior be cannot be carried out mechanics reparation and the deficiency scrapped, there is provided a kind of can the mechanical property of the inferior gapless atomic steel of the not flattened mechanical property of drawn straightener reparation, make it become and give up as qualified products, mechanical property meets requirement, thus increasing the restorative procedure of the fault IF steel mechanical property of qualification rate.
Realize the measure of above-mentioned purpose:
A kind of restorative procedure of not flattened fault IF steel mechanical property, its step:
1) the fault coil of strip that will carry out repairing carries out uncoiling on uncoiler, and part undesirable in coil of strip is wiped out；After carry out threading；The tension force of uncoiler controls at 25 ~ 35N/mm2；
2) adopting the bending roll group of seven-roll Abramsen machine and the working roll of pulling-straightening roller group that steel plate is rolled, control the pressure degree of depth of bending section at 9 ~ 11mm, the pressure degree of depth of straightening section is at 9 ~ 11mm, and unit operation speed is at 90 ~ 110m/min；Shield during this period and by the position sensor in seven-roll Abramsen machine；
3) batch, control coiling tension at 35 ~ 45N/mm2。
It is characterized in that: bending roll group and the working roll of pulling-straightening roller group in described seven-roll Abramsen machine are the stacks after chromium plating.
The effect of master operation in the present invention
The present invention is based on after having done substantial amounts of tracking and testing research to the production of gapless atomic steel cold rolled sheet product, select to adopt following new technology to solve the problem that this series products cannot repair mechanical property: 1. utilize tension straingtening equipment, produce steel plate extension by arranging suitable tension force；2. the drafts of each roller group of tension straingtening equipment is set.
It should be noted that the work roll surface of the bending roll group in seven-roll Abramsen machine and pulling-straightening roller group processes through chromium plating；Ensureing the synchronous operation of seven-roll Abramsen machine working roll group and strip steel, its measure strengthens bearing lubrication exactly.
The present invention compared with prior art, can the mechanical property of the inferior gapless atomic steel of the not flattened mechanical property of drawn straightener reparation so that it is becoming and give up as qualified products, mechanical property meets requirement, thus increasing qualification rate, reducing production cost, economizing on resources.
Accompanying drawing explanation
Accompanying drawing is the schematic diagram adopting seven-roll Abramsen machine to carry out mechanical property reparation；
In figure: 1 working roll drafts h, 2 carry out the strip steel of recovery of performance, the working roll of 3 pressures, 4 elastic deformation area, and 5 produce the region of plastic deformation, and 6 fixing rollers, 7 produce the region of plastic deformation, 8 elastic deformation area.
Detailed description of the invention
Below the present invention is described in detail:
The bending roll group of the following stated tension straingtening and the working roll of smoothing roll group are the roller after chromium plating；
Embodiment 1
Reel sets: the mechanical property of the qualified coil of strip after flattened should be: tensile strength is at 270-330MPa, and yield strength is at 120-180MPa, and elongation percentage is more than 42%；Product should be: thickness is 0.8mm, and width is 1700mm；
When continuous annealing unit produces, owing to there is drive failures in the planisher of continuous annealing unit, therefore not flattened and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will carry out repairing carries out uncoiling on uncoiler, and part undesirable in coil of strip is wiped out；After carry out threading；The tension force of uncoiler is 26N/mm2；
2) adopting the bending roll group of seven-roll Abramsen machine after chromium plating and the working roll of smoothing roll group that steel plate is rolled, the pressure degree of depth of bending section is 9mm, and the pressure degree of depth of straightening section is at 9.5mm, and unit operation speed is at 100m/min；Shield during this period and by the position sensor in seven-roll Abramsen machine；
3) batching, coiling tension is at 38N/mm2。
After testing, the fault IF steel mechanical property after repaired is: tensile strength is at 311MPa, and yield strength is at 140MPa, and elongation percentage is 48%.It compared with mechanical property of design, meets the requirements with reel, and the coil of strip after namely repaired becomes qualified products, fully meets requirement.
Embodiment 2
Reel sets: the mechanical property of the qualified coil of strip after flattened should be: tensile strength is at 270-330MPa, and yield strength is at 120-180MPa, and elongation percentage is more than 42%；Product should be: thickness is 0.65mm, and width is 1650mm；
Due to when continuous annealing unit produces, it is pressed against fault owing to the planisher of continuous annealing unit has frame, therefore not flattened and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will carry out repairing carries out uncoiling on uncoiler, and part undesirable in coil of strip is wiped out；After carry out threading；The tension force of uncoiler is 31N/mm2；
2) adopting the bending roll group of seven-roll Abramsen machine after chromium plating and the working roll of smoothing roll group that steel plate is rolled, the pressure degree of depth of bending section is 9.5mm, and the pressure degree of depth of straightening section is at 10.5mm, and unit operation speed is at 95m/min；Shield during this period and by the position sensor in seven-roll Abramsen machine；
3) batching, coiling tension is at 35N/mm2。
After testing, the fault IF steel mechanical property after repaired is: tensile strength is at 138MPa, and yield strength is at 142MPa, and elongation percentage is 47%.It compared with mechanical property of design, meets the requirements with reel, and the coil of strip after namely repaired becomes qualified products, fully meets requirement.
Embodiment 3
Reel sets: the mechanical property of the qualified coil of strip after flattened should be: tensile strength is at 270-330MPa, and yield strength is at 120-180MPaMPa, and elongation percentage is more than 42%；Product should be: thickness is 1.1mm, and width is 1750mm；
Due to when continuous annealing unit produces, owing to the planisher working roll of continuous annealing unit damages, therefore not flattened and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will carry out repairing carries out uncoiling on uncoiler, and part undesirable in coil of strip is wiped out；After carry out threading；The tension force of uncoiler is 34N/mm2；
2) adopting the bending roll group of seven-roll Abramsen machine after chromium plating and the working roll of smoothing roll group that steel plate is rolled, the pressure degree of depth of bending section is 10mm, and the pressure degree of depth of straightening section is at 9.5mm, and unit operation speed is at 105m/min；Shield during this period and by the position sensor in seven-roll Abramsen machine；
3) batching, coiling tension is at 42N/mm2。
After testing, the fault IF steel mechanical property after repaired is: tensile strength is at 298MPa, and yield strength is at 137MPa, and elongation percentage is 46%.It compared with mechanical property of design, meets the requirements with reel, and the coil of strip after namely repaired becomes qualified products, fully meets requirement.
Embodiment 4
Reel sets: the mechanical property of the qualified coil of strip after flattened should be: tensile strength is at 270-330MPa, and yield strength is at 120-180MPa, and elongation percentage is more than 42%；Product should be: thickness is 2.5mm, and width is 950mm；
Due to when continuous annealing unit produces, owing to the planisher of continuous annealing unit occurs that working roll damages, therefore not flattened and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will carry out repairing carries out uncoiling on uncoiler, and part undesirable in coil of strip is wiped out；After carry out threading；The tension force of uncoiler is 25N/mm2；
2) adopting the bending roll group of seven-roll Abramsen machine after chromium plating and the working roll of smoothing roll group that steel plate is rolled, the pressure degree of depth of bending section is 10mm, and the pressure degree of depth of straightening section is at 10mm, and unit operation speed is at 110m/min；Shield during this period and by the position sensor in seven-roll Abramsen machine；
3) batching, coiling tension is at 45N/mm2。
After testing, the fault IF steel mechanical property after repaired is: tensile strength is at 300MPa, and yield strength is at 146MPa, and elongation percentage A is 45%.It compared with mechanical property of design, meets the requirements with reel, and the coil of strip after namely repaired becomes qualified products, fully meets requirement.
Embodiment 5
Reel sets: the mechanical property of the qualified coil of strip after flattened should be: tensile strength is at 270-330MPa, and yield strength is at 120-180MPa, and elongation percentage A is more than 42%；Product should be: thickness is 1.6mm, and width is 1300mm；
Due to when continuous annealing unit produces, owing to there is the roll marks that working roll produces in the planisher of continuous annealing unit, therefore not flattened and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will carry out repairing carries out uncoiling on uncoiler, and part undesirable in coil of strip is wiped out；After carry out threading；The tension force of uncoiler is 35N/mm2；
2) adopting the bending roll group of seven-roll Abramsen machine after chromium plating and the working roll of smoothing roll group that steel plate is rolled, the pressure degree of depth of bending section is 11mm, and the pressure degree of depth of straightening section is at 9mm, and unit operation speed is at 90m/s；Shield during this period and by the position sensor in seven-roll Abramsen machine；
3) batching, coiling tension is at 39N/mm2。
After testing, the fault IF steel mechanical property after repaired is: tensile strength is at 302MPa, and yield strength is at 146MPa, and elongation percentage A is 45%.It compared with mechanical property of design, meets the requirements with reel, and the coil of strip after namely repaired becomes qualified products, fully meets requirement.
Above-described embodiment is only the best and enumerates, and is not the restriction to embodiments of the present invention.
Claims (1)
1. a restorative procedure for not flattened fault IF steel mechanical property, its step:
1) the fault coil of strip that will carry out repairing carries out uncoiling on uncoiler, and part undesirable in coil of strip outer ring is wiped out；After carry out threading；The tension force of uncoiler controls at 25 ~ 35N/mm2；
2) adopting the bending roll group of seven-roll Abramsen machine and the chromium plating working roll of pulling-straightening roller group that steel plate is rolled, control the pressure degree of depth of bending section at 9 ~ 11mm, the pressure degree of depth of straightening section is at 9 ~ 11mm, and unit operation speed is at 90 ~ 110m/s；Shield during this period and by the position sensor in seven-roll Abramsen machine；
3) batch, control coiling tension at 35 ~ 45N/mm2。
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1424154A (en) * | 2002-12-31 | 2003-06-18 | 赵新林 | Process and apparatus for producing super-thin precisive band steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1424154A (en) * | 2002-12-31 | 2003-06-18 | 赵新林 | Process and apparatus for producing super-thin precisive band steel |
Non-Patent Citations (1)
| Title |
|---|
| "1580mm拉伸弯曲矫直机在泰钢冷轧厂的应用";朱丛贵等;《山东冶金》;20100630;第32卷(第3期);第35-37页 * |
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Effective date of registration: 20170817 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |