CN104087731A - Method for repairing mechanical properties of uneven fault IF steel - Google Patents
Method for repairing mechanical properties of uneven fault IF steel Download PDFInfo
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- CN104087731A CN104087731A CN201410348709.0A CN201410348709A CN104087731A CN 104087731 A CN104087731 A CN 104087731A CN 201410348709 A CN201410348709 A CN 201410348709A CN 104087731 A CN104087731 A CN 104087731A
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Abstract
The invention relates to a method for repairing mechanical properties of uneven fault IF steel. The method for repairing mechanical properties of the uneven fault IF steel comprises the following steps: uncoiling a fault steel coil to be repaired on an uncoiling machine, and cutting off a part which does not meet the requirement in the steel coil; calendering a steel plate by adopting working rolls in a bending roll group and a straightening roll group of a tension straightening machine, wherein depression depth of a bending section is controlled to be 9-11mm, the depression depth of a straightening section is controlled to be 9-11mm, and running speed of each machine unit is controlled to be 90-110m/min; meanwhile, shielding a position sensor in the tension straightening machine; coiling at coiling tension of 35-45N/mm<2>. The method for repairing the mechanical properties of the uneven fault IF steel has the advantages that the tension straightening machine is adopted for repairing mechanical properties of interstitial free steel with imperfect mechanical properties uneven, so that the uneven fault IF steel is changed into a qualified product; mechanical properties can meet requirements, so that yield is increased, production cost is reduced, and resource is saved.
Description
Technical field
The present invention relates to a kind of restorative procedure of mechanical property of steel plate, belong to particularly a kind of restorative procedure without smooth fault IF steel mechanical property, it is more suitable for thickness at 0.2-2.5mm definitely, and width is at the restorative procedure without smooth fault IF steel mechanical property of 800-2000mm.
Background technology
IF steel claims again gapless atomic steel, in this steel, because C, N content are low, adding after a certain amount of Ti, Nb, C, N atom in steel are fixed to as carbide and nitride, thereby making 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 low yield-point and yield tensile ratio, high elongation rate, the high deep drawability such as plastic strain ratio, high work hardening exponent, and has without ageing.
In 1949, external expert just proposed gapless atomic steel scheme the earliest, and at the end of the sixties in last century, along with the application of vacuum degassing technology in metallurgical production, this steel grade starts to produce, but only for the complicated structure of a small amount of distortion on automobile.After 1980, various countries' metallurgical technology starts to develop rapidly, and gapless atomic steel starts to be progressively applied to integral body and manufactures.
Due to automobile with Interstitial Atom Free Sheet Steel thickness generally between 0.6-1.5mm, width is between 1200-2000mm, therefore this series products is all produced at continuous annealing unit.Generally after annealing furnace, be provided with a levelling machine at continuous annealing unit, rely on tensioning roller and the leveling roll group of frame front and back to produce certain unit elongation and draught to band steel, to producing certain raising with the intensity of steel, and eliminate yield point elongation, reach the final mechanical property requirement of product.The levelling machine system operation troubles that occurs now and then and continuous annealing unit is in operation, and whole unit is because furnace temperature is compared with high and cannot shut down processing.Therefore, often can produce part without smooth product.This series products, due to without smooth, therefore cannot reach the standard of mechanical property, causes and scraps or as defect ware processing, cause qualification rate to decline, and cost increases.And for this type of defect ware, due to Interstitial Atom Free Sheet Steel, intensity is low, steel is soft, in the time reprocessing by levelling machine after annealing furnace heating again, can make steel plate in stove produce fold and scrap or broken belt, so cannot again anneal and smooth processing.
Up to the present, both at home and abroad for this because be exactly mainly to scrap as main without the inferior gapless atomic steel of smooth mechanical property extremely.
Through consulting pertinent literature and patent, all find no production technique and the technical scheme of effect.Some producers have the smooth unit of employing single chassis to repair in early days, but it is the steel band below 1300mm for width, cannot realize the smooth reparation again of the gapless atomic steel of the above wide cut of 1300mm that auto sheet is used.
Refer to and do not affecting under the surface quality of product and the prerequisite of apparent size for the finished steel plate mechanical property reparation of gapless atomic steel, make its mechanical property reach the scope that product is set.
Stretch-bend leveller equipment is the requirement of the template planeness for adapting to strip of steel plate high request, its work characteristics is under the combined action of tensioning roller and the continuous alternate repetition bending of bending roll, to make band production plastic elongation and obtain strip aligning, can eliminate the ternary shape defects such as the song that wafts, edge shape wave and camber with steel.
Summary of the invention
The present invention is directed to that prior art cannot be carried out mechanics reparation to the inferior gapless atomic steel of the mechanical property without smooth and the deficiency of being scrapped, provide a kind of and can repair the mechanical property without the inferior gapless atomic steel of smooth mechanical property by drawn straightener, its change is given up as qualified product, mechanical property meets the demands, thereby increases the restorative procedure of the fault IF steel mechanical property of qualification rate.
Realize the measure of above-mentioned purpose:
Without a restorative procedure for smooth fault IF steel mechanical property, its step:
1) the fault coil of strip that will repair carries out uncoiling on Abrollhaspel, and the part not meeting the requirements in coil of strip is wiped out; After carry out threading; The tension control of Abrollhaspel is at 25 ~ 35N/mm
2;
2) adopt the bending roll group of stretching straightener and the working roll of pulling-straightening roller group to roll steel plate, that controls bending section depresses the degree of depth at 9 ~ 11mm, straightening section depress the degree of depth at 9 ~ 11mm, unit operation speed is at 90 ~ 110m/min; Shield during this period and by the position transducer in stretching straightener;
3) batch, control coiling tension at 35 ~ 45N/mm
2.
It is characterized in that: the bending roll group in described stretching straightener and the working roll of pulling-straightening roller group are the stacks after chromium plating.
The effect of master operation in the present invention
The present invention is based on the production of gapless atomic steel cold rolled sheet product has been done after a large amount of tracking and testing research, select to adopt following novel process to solve this series products and cannot repair the problem of mechanical property: 1. utilize tension leveling equipment, produce steel plate and extend by suitable tension force is set; 2. the draught of each roller group of tension leveling equipment is set.
It should be noted that the work roll surface of bending roll group in stretching straightener and pulling-straightening roller group is through chromium plating processing; Ensure stretching straightener working roll group and the synchronous operation with steel, its measure strengthens bearing lubrication exactly.
The present invention compared with prior art, can repair the mechanical property without the inferior gapless atomic steel of smooth mechanical property by drawn straightener, and its change is given up as qualified product, mechanical property meets the demands, thereby increase qualification rate, reduces production costs, and economizes on resources.
Brief description of the drawings
Accompanying drawing is the schematic diagram that adopts stretching straightener to carry out mechanical property reparation;
In figure: 1-working roll draught h, 2-carry out the band steel of recovery of performance, the 3-working roll depressed, 4-recoverable deformation region, 5-produce the region of viscous deformation, 6-stationary roll, 7-produce the region of viscous deformation, 8-recoverable deformation region.
Embodiment
Below the present invention is described in detail:
The bending roll group of the following stated tension leveling and the working roll of straightening roll group are the roller after chromium plating;
Embodiment 1
Reel is set: the mechanical property of the qualified coil of strip after smooth should be: tensile strength is at 270-330MPa, and yield strength is at 120-180MPa, and unit elongation is more than 42 %; Product should be: thickness is 0.8mm, and width is 1700mm;
In the time that continuous annealing unit is produced, there is transmission fault owing to connecting the levelling machine that moves back unit, therefore without smooth and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will repair carries out uncoiling on Abrollhaspel, and the part not meeting the requirements in coil of strip is wiped out; After carry out threading; The tension force of Abrollhaspel is 26N/mm
2;
2) adopt the bending roll group of stretching straightener and the working roll of straightening roll group after chromium plating to roll steel plate, the degree of depth of depressing of bending section is 9mm, straightening section depress the degree of depth at 9.5mm, unit operation speed is at 100m/min; Shield during this period and by the position transducer in stretching straightener;
3) batch, coiling tension is at 38N/mm
2.
After testing, the fault IF steel mechanical property after repairing is: tensile strength is at 311MPa, and yield strength is at 140 MPa, and unit elongation is at 48 %.It is compared with the mechanical property of reel design, meets the requirements, and the coil of strip after repairing becomes qualified product, meets the demands completely.
Embodiment 2
Reel is set: the mechanical property of the qualified coil of strip after smooth should be: tensile strength is at 270-330 MPa, and yield strength is at 120-180MPa, and unit elongation is more than 42 %; Product should be: thickness is 0.65mm, and width is 1650mm;
Due in the time that continuous annealing unit is produced, have frame and press fault owing to connecting the levelling machine that moves back unit, therefore without smooth and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will repair carries out uncoiling on Abrollhaspel, and the part not meeting the requirements in coil of strip is wiped out; After carry out threading; The tension force of Abrollhaspel is 31N/mm
2;
2) adopt the bending roll group of stretching straightener and the working roll of straightening roll group after chromium plating to roll steel plate, the degree of depth of depressing of bending section is 9.5mm, straightening section depress the degree of depth at 10.5mm, unit operation speed is at 95m/min; Shield during this period and by the position transducer in stretching straightener;
3) batch, coiling tension is at 35N/mm
2.
After testing, the fault IF steel mechanical property after repairing is: tensile strength is at 138 MPa, and yield strength is at 142 MPa, and unit elongation is at 47 %.It is compared with the mechanical property of reel design, meets the requirements, and the coil of strip after repairing becomes qualified product, meets the demands completely.
Embodiment 3
Reel is set: the mechanical property of the qualified coil of strip after smooth should be: tensile strength is at 270-330 MPa, and yield strength is at 120-180 MPa MPa, and unit elongation is more than 42 %; Product should be: thickness is 1.1mm, and width is 1750mm;
Due in the time that continuous annealing unit is produced, owing to connecting the levelling machine working roll damage of moving back unit, therefore without smooth and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will repair carries out uncoiling on Abrollhaspel, and the part not meeting the requirements in coil of strip is wiped out; After carry out threading; The tension force of Abrollhaspel is 34N/mm
2;
2) adopt the bending roll group of stretching straightener and the working roll of straightening roll group after chromium plating to roll steel plate, the degree of depth of depressing of bending section is 10mm, straightening section depress the degree of depth at 9.5mm, unit operation speed is at 105m/min; Shield during this period and by the position transducer in stretching straightener;
3) batch, coiling tension is at 42N/mm
2.
After testing, the fault IF steel mechanical property after repairing is: tensile strength is at 298MPa, and yield strength is at 137 MPa, and unit elongation is at 46 %.It is compared with the mechanical property of reel design, meets the requirements, and the coil of strip after repairing becomes qualified product, meets the demands completely.
Embodiment 4
Reel is set: the mechanical property of the qualified coil of strip after smooth should be: tensile strength is at 270-330MPa, and yield strength is at 120-180MPa, and unit elongation is more than 42 %; Product should be: thickness is 2.5mm, and width is 950mm;
Due in the time that continuous annealing unit is produced, there is working roll damage owing to connecting the levelling machine that moves back unit, therefore without smooth and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will repair carries out uncoiling on Abrollhaspel, and the part not meeting the requirements in coil of strip is wiped out; After carry out threading; The tension force of Abrollhaspel is 25N/mm
2;
2) adopt the bending roll group of stretching straightener and the working roll of straightening roll group after chromium plating to roll steel plate, the degree of depth of depressing of bending section is 10mm, straightening section depress the degree of depth at 10mm, unit operation speed is at 110m/min; Shield during this period and by the position transducer in stretching straightener;
3) batch, coiling tension is at 45N/mm
2.
After testing, the fault IF steel mechanical property after repairing is: tensile strength is at 300 MPa, and yield strength is at 146 MPa, and unit elongation A is at 45 %.It is compared with the mechanical property of reel design, meets the requirements, and the coil of strip after repairing becomes qualified product, meets the demands completely.
Embodiment 5
Reel is set: the mechanical property of the qualified coil of strip after smooth should be: tensile strength is at 270-330 MPa, and yield strength is at 120-180 MPa, and unit elongation A is more than 42 %; Product should be: thickness is 1.6mm, and width is 1300mm;
Due in the time that continuous annealing unit is produced, due to the roll marks that connects the levelling machine that moves back unit and occur that working roll produces, therefore without smooth and carry out the reparation of mechanical property according to following steps:
1) the fault coil of strip that will repair carries out uncoiling on Abrollhaspel, and the part not meeting the requirements in coil of strip is wiped out; After carry out threading; The tension force of Abrollhaspel is 35N/mm
2;
2) adopt the bending roll group of stretching straightener and the working roll of straightening roll group after chromium plating to roll steel plate, the degree of depth of depressing of bending section is 11mm, straightening section depress the degree of depth at 9mm, unit operation speed is at 90m/s; Shield during this period and by the position transducer in stretching straightener;
3) batch, coiling tension is at 39N/mm
2.
After testing, the fault IF steel mechanical property after repairing is: tensile strength is at 302 MPa, and yield strength is at 146 MPa, and unit elongation A is 45%.It is compared with the mechanical property of reel design, meets the requirements, and the coil of strip after repairing becomes qualified product, meets the demands completely.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1. without the restorative procedure of smooth fault IF steel mechanical property, its step:
1) the fault coil of strip that will repair carries out uncoiling on Abrollhaspel, and the part not meeting the requirements in coil of strip outer ring is wiped out; After carry out threading; The tension control of Abrollhaspel is at 25 ~ 35N/mm
2;
2) adopt the bending roll group of stretching straightener and the working roll of pulling-straightening roller group to roll steel plate, that controls bending section depresses the degree of depth at 9 ~ 11mm, straightening section depress the degree of depth at 9 ~ 11mm, unit operation speed is at 90 ~ 110m/s; Shield during this period and by the position transducer in stretching straightener;
3) batch, control coiling tension at 35 ~ 45N/mm
2.
2. a kind of restorative procedure without smooth fault IF steel mechanical property as claimed in claim 1, is characterized in that: the bending roll group in described stretching straightener and the working roll of pulling-straightening roller group are the stacks after chromium plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410348709.0A CN104087731B (en) | 2014-07-22 | 2014-07-22 | A kind of restorative procedure of not flattened fault IF steel mechanical property |
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|---|---|---|---|
| CN201410348709.0A CN104087731B (en) | 2014-07-22 | 2014-07-22 | A kind of restorative procedure of not flattened fault IF steel mechanical property |
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| CN104087731A true CN104087731A (en) | 2014-10-08 |
| CN104087731B CN104087731B (en) | 2016-07-06 |
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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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- 2014-07-22 CN CN201410348709.0A patent/CN104087731B/en active Active
Patent 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 |
Non-Patent Citations (1)
| Title |
|---|
| 朱丛贵等: ""1580mm拉伸弯曲矫直机在泰钢冷轧厂的应用"", 《山东冶金》 * |
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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. |
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