CN104178621A - Heat treatment method of steel band for packaging - Google Patents

Heat treatment method of steel band for packaging Download PDF

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Publication number
CN104178621A
CN104178621A CN201410452789.4A CN201410452789A CN104178621A CN 104178621 A CN104178621 A CN 104178621A CN 201410452789 A CN201410452789 A CN 201410452789A CN 104178621 A CN104178621 A CN 104178621A
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China
Prior art keywords
steel band
steel
less
heat treating
packaging
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CN201410452789.4A
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Chinese (zh)
Inventor
王强
李雯
严俊
许建明
韩建春
袁洁敏
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SHANGHAI BAOGANG PACKAGING STEEL STRIP CO Ltd
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SHANGHAI BAOGANG PACKAGING STEEL STRIP CO Ltd
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Priority to CN201410452789.4A priority Critical patent/CN104178621A/en
Publication of CN104178621A publication Critical patent/CN104178621A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a heat treatment method of a steel band for packaging. The heat treatment method comprises the following steps of (a) heating the steel band to austenitizing temperature of 840-880 DEG C, and preserving the heat for 30-40 seconds; (b) carrying out isothermal quenching; (c) scraping lead from a carbon tower; (d) water cooling; (e) naturally air cooling, wherein the isothermal quenching in the step (b) is carried out in molten lead at 425-435 DEG C for the time of 21-28 seconds, and the steel band comprises the following components in percentage by weight: 0.15%-0.20% of C, 0.05%-0.2% of Si, 1.30%-1.6% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S and the balance of Fe. The packaging steel band produced through the heat treatment method disclosed by the invention belongs to a high-strength packaging steel band, is stable in mechanical property, good in obdurability, is not less than 940 Mpa in tensile strength and not less than 12% in elongation rate by being measured through experiments, is good in model and completely meets the requirements of packaging bundling industry of products of iron and steel industry, building industry, building industry, mechanical industry and the like.

Description

A kind of heat treating method of steel belt for packages
Technical field
The heat treating method that the present invention relates to a kind of steel belt for packages, belongs to metallurgical technology field.
Background technology
Steel belt for packages, also claims tie or steel band, is a kind of narrow strip wrapping material with certain unit elongation compared with high-tensile that have.It is widely used in the packing bundling of the products such as Iron And Steel Industry, building industry, non-ferrous metal industry, glass industry, mechanical industry.
In " tensile property of table 4 steel band " in CNS GB/T 25820-2010 steel belt for packages, the tensile strength of 930KD is not less than 930MPA, and elongation after fracture is not less than 10%.The tensile strength of the ULT900 trade mark in " tensile property of table 5 steel band " in the company standard Q/BQB 908-2006 of Baoshan Iron & Steel Co., Ltd is not less than 900MPA, elongation after fracture is not less than 8%, so the product innovation of inferior Baoshan Iron & Steel Co., Ltd development is that tensile strength is not less than 940MPA, elongation after fracture is not less than 12%.
Traditional high-intensity packing generally has two production processes by steel band production technique.Its master operation one is: welding → kink → thermal treatment → batching; It two is: through heat treated work in-process → welding → shearing → burr finishing → turn blue → paint → wax etc.Production regular tenacity and middle high-intensity packing with steel band only need through together with production process, high strength and superstrength steel band need through heat-treatment lines and slitting lacquer wire twice production process.
Package steel strip, in heat treatment process, can obtain different tissues under differing temps.By intensity index, arrange: martensite > bainite > perlite > ferrite > austenite, and toughness index is just in time contrary.Therefore the words of wanting all to obtain ideal value on obdurability must be by thermal treatment.And the maximum difficulty of thin plate thermal treatment process is restive template, therefore conventionally adopt isothermal quenching technique.Traditional high-intensity packing with the thermal treatment production process of steel band is: preheating → be heated to ℃ isothermal quenching → 60,860 ± 20 ℃ of austenitizing temperature → 450 ℃ shrend → air cooling → batch, steel belt operating speed is more than 20m/s.
What under this technique, the product of output obtained is ferrite and lower bainite tissue (referring to Fig. 1).And the existence of a small amount of proeutectoid ferrite has been played good effect to improving the plasticity of tie; On the other hand, the existence of lower bainite has guaranteed the intensity index of steel band.The mixing of these two kinds of microstructures exists, and makes it reach the performance requriements of high-strength steel strip.
Publication number is CN1712552A, within open day, is that the Chinese invention patent application on December 28th, 2005 discloses a kind of high-intensity packing steel belt, and the hot-rolled coil that adopts following composition is raw material, through slitting, pickling, cold rolling, cut open and cut; It is characterized in that: the weight percentage of hot-rolled coil composition is: C:0.24%, Si:0.013%, Mn:1.3%, P≤0.012%, S≤0.008%, Als >=0.020%, Nb:0.015%, surplus is Fe; Steel band through above-mentioned processing, enters liquid furnace through citation roller, and in stove, temperature is 460~560 ℃, speed 15m/min~the 30m/min of steel band, steel band heats in liquid furnace, and steel band is through carbon tower: temperature rises to more than 620~720 ℃ and by S roller, enters oil groove through air-cooled, washing, makes finished product.According to specification sheets, claim, the mixed type tissue that the metallographic structure of this package steel strip is ferrite+granular bainite, its tensile strength is not less than 950MPa, and elongation is not less than 10%.
Granted publication number is CN1189584C, Granted publication day is that the Chinese invention patent on February 16th, 2005 discloses a kind of high-intensity packing steel belt and thermal treatment process thereof, the composition of this steel band is (weight percent): C:0.22~0.29%, Si≤0.015%, Mn:1.30~1.5%, P≤0.012%, S≤0.010%, Als:0.015%, Nb:0.012%, surplus is Fe; Its technological process is that steel band enters electrical heater through citation roller, and in stove, temperature is 550 ℃~650 ℃, and the speed of its steel band operation is 2.5~3.5m/min, and the temperature that steel band is come out of the stove is 450 ℃~550 ℃, and steel band is natural air cooled after coming out of the stove.According to specification sheets, claim the tensile property of this steel band to be not less than 880MPa, elongation is not less than 8%.
Granted publication number is CN1318630C, Granted publication day is that the Chinese invention patent on May 30th, 2007 discloses a kind of high-intensity packing steel belt and manufacturing process thereof, selecting carbon manganese steel hot-rolled coil is raw material, described carbon manganese steel comprises following component (weight percent): C:0.15~0.28%, Si0.005~0.07%, Mn:1.20~1.7%, P:0.005~0.025%, S:0.0005~0.015%, Als:0.015~0.10%, all the other are Fe.This roll bending carries out cold rolling after slitting, pickling, then the steel band after cold rolling is sent into continuous furnace, make steel band be heated to 400~600 ℃, cooling after steel band is come out of the stove, the tensile strength of the high-intensity packing steel belt obtaining is not less than 930MPa, and elongation is not less than 8%.
But the tensile strength of the steel belt for packages obtaining according to foregoing prior heat treatment process and foregoing invention or application for a patent for invention manufacture does not all reach 940MPA, the standard of unit elongation 12%.
Summary of the invention
The object of the invention is to propose a kind of heat treating method of steel belt for packages, and the steel belt for packages tensile strength making by present heat treating method exploitation is not less than 940MPa, and elongation after fracture is not less than 12% new variety, and template is better.
For achieving the above object, the technical solution used in the present invention is as follows:
A heat treating method for steel belt for packages, comprises the steps:
A) steel band is heated to the austenitizing temperature of 840~880 ℃, insulation 30~40s;
B) carry out isothermal quenching;
C) carbon tower is scraped lead;
D) water-cooled;
E) natural air cooling.
Wherein: described step b), isothermal quenching is carried out in plumbous liquid at 425~435 ℃, and isothermal quenching time is 21~28s; The composition of described steel band and weight percent are C:0.15~0.20%, Si:0.05~0.2%, Mn:1.30~1.6%, P≤0.030%, S≤0.030%, surplus is Fe, austempering temperature is lower than 425 ℃, will unit elongation lower than expection, higher than 435 ℃, will tensile strength lower than expection; Isothermal quenching time is lower than 21s, will unit elongation lower than expection, isothermal quenching time is higher than 28s, will tensile strength lower than expection.
As preferred version, described step a) in, when to the heating of described steel band, adopt described steel band is placed in to the mode heating under the protection of shielding gas heats.
As preferred version, described step a) in, when to the heating of described steel band, adopt the mode of electromagnetic induction coil heating in medium frequency to heat.
As preferred version, described step a) in, first by described steel band at described step b) in plumbous liquid in carry out preheating, be 6.75~9 seconds warm up time.
As preferred version, described steps d) in, in the water of 60 ± 10 ℃, carry out water-cooled.
Compared with prior art, the present invention is by adjusting austenitizing time, austempering temperature and time, adopt above-mentioned heat treating method that steel band interior tissue is undergone phase transition and obtain lower bainite and martensitic heterogeneous structure (referring to Fig. 2), under the prerequisite that guarantees steel band plasticity, obviously improved its intensity index.Can extend soaking time by the travelling speed of reduction steel band and make its austenite homogenizing.Because austenitic average carbon content is lower than pearlitic average carbon content, thus perlite in changing austenitic process into, when the ferrite in perlite all disappears, cementite does not also dissolve completely.Therefore reduce the travelling speed of steel band by reducing unit speed, not molten cementite is constantly dissolved in austenite, and the diffusion in austenite make being evenly distributed of the carbon in austenite by carbon.On the other hand, the downward of the travelling speed of steel band has extended the time that steel belt isothermal quenches.Known according to the isothermal quenching curve of steel band, isothermal quenching time is longer, and austenite is more abundant to Lower Bainite Transformation, and the lower bainite amount obtaining is just more, and strength property is also just better.
When isothermal quenching, starting to realize austenite changes to austempering.The hardness of lower bainite is about HRC45~55, has higher intensity and good plasticity and toughness simultaneously.Affecting bainite strength factor is mainly the size of bainite bar and the size of carbide particle.According to Hall-Petch relational expression and dispersion-strengthened mechanism, the diameter of bainite bar is less and carbide particle diameter is less, the more, and the intensity of bainite is just higher.And bainite formation temperature is lower, the diameter of bainite bar less and carbide particle diameter is less, the more.By above-mentioned, can learn that the tensile strength of bainite increases along with the reduction of formation temperature, so by adjusting bainite formation temperature, adjust austempering temperature and control half-finished intensity.
The steel belt for packages of producing under this heat treating method, belong to high-intensity packing steel band, stable mechanical performance, there is good obdurability, experiment records tensile strength and is not less than 940Mpa unit elongation and is not less than 12%, template is better, meets the packing bundling industry of the products such as Iron And Steel Industry, building industry, mechanical industry completely.
The tensile strength that experiment showed, this steel belt for packages is not less than 940MPa, and elongation after fracture is not less than 12%, and template is better.
Accompanying drawing explanation
Fig. 1 is the structure figure of the steel belt for packages that makes of traditional heat treating method;
Fig. 2 is the structure figure that adopts the steel belt for packages that heat treating method of the present invention makes;
Fig. 3 is the structural representation that carries out the equipment of heat treating method of the present invention;
Fig. 4 is the schema that carries out heat treating method of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further elaborated.
Referring to Fig. 3.Figure 3 shows that the equipment that carries out heat treating method of the present invention.This equipment mainly comprises: the lead bath furnace of plumbous liquid 5 is housed, shielding gas case 1, insulated rollers 23,24, guide roller 21,22,25,26, electromagnetic induction coil 4 in lead bath 6.Protection gas tank 1 is approximate inverted u-shaped on the whole, and the inner cavity that forms, is filled with shielding gas in cavity, the hydrogen that shielding gas is 5% containing mass percent, and all the other 95% are nitrogen.Respectively there is an opening at two of protection gas tank 1, as import and the outlet of steel band 3; The bottom of protection gas tank 1 is immersed in the plumbous liquid 5 of lead bath 6, protects like this opening at gas tank 1 two to be also in plumbous liquid 5.Protecting two nooks of the inwall of gas tank 1 that insulated rollers 23,24 is installed.Nook in lead bath 6 inwall steel band operations is also provided with insulated rollers; as shown in Figure 3; steel band 3 enter plumbous liquid 5 places below lead bath 6 inwalls on guide roller 21 is installed; protection gas tank 1 import below lead bath 6 inwalls on guide roller 22 is installed; protection gas tank 1 outlet below lead bath 6 inwalls on guide roller 25 is installed, steel band 3 walk out plumbous liquid 5 places below lead bath 6 inwalls on guide roller 26 is installed.3 of steel bands are on insulated rollers 23,24 and guide roller 21,22,25,26, and under the drive of unit, steel band 3 just can move by the route of design like this.At protection gas tank 1, be provided with electromagnetic induction coil 4 around, realize the heating in medium frequency to steel band 3.
During concrete production, by high-intensity steel belt for packages production technique, employing hot-rolled coil is raw material, through slitting, pickling, cold rolling, then adopts heat treating method of the present invention to heat-treat.Again referring to Fig. 4, during thermal treatment, under the drive of insulated rollers 23,24 and guide roller 21,22,25,26, steel band 3 travelling speed are 15m/min~20m/min, the plumbous liquid 5 that steel band 3 is introduced in the lead bath 6 of lead bath furnace carries out preheating, plumbous liquid temp is 425~435 ℃, and be 6.75~9 seconds warm up time; Then enter gas shield case 1, under the protection of shielding gas, by electromagnetic induction coil 4, carry out heating in medium frequency, be heated to after 860 ± 20 ℃ of austenitic temperature, insulation 30~40s; Then steel band 3 again enters and in the plumbous liquid 5 of lead bath furnace lead bath 6, carries out isothermal quenching and start to occur Lower Bainite Transformation, and the temperature range of isothermal quenching is 425~435 ℃, and the time is 21~28s; Then after scraping lead, 60 ± 10 ℃ of water-cooleds, natural air cooling, carbon tower batches the work in-process that make high-intensity steel belt for packages.Again by the slitting japanning production technique of traditional high-intensity steel belt for packages, by the work in-process of high-intensity steel belt for packages through shearing, burr finishing, turn blue, the technique such as japanning, waxing makes finished product.
As raw-material hot-rolled coil, adopt composition and the following carbon manganese steel of weight percent:
C:0.15~0.20%, Si:0.05~0.2%, Mn:1.30~1.6%, P≤0.030%, S≤0.030%, surplus is Fe.
Embodiment 1
Choose a kind of carbon manganese steel that comprises following chemical composition: C:0.16%, Si:0.08%, Mn:1.35%, P:0.019%, S:0.009%, surplus is Fe, described percentage ratio is weight percentage.
Selecting the above-mentioned carbon manganese steel hot-rolled sheet that 3.3mm is thick is raw material, becomes the steel band of 0.9 * 199mm through pickling and cold-rolling, the mechanical property after it is cold rolling: tensile strength is 930MPa, and unit elongation is 6%.Then enter the equipment that carries out heat treating method of the present invention, by heat treating method of the present invention, carry out modifier treatment, whole heat treatment process steel belt operating speed is 17m/min, be heated to 860 ℃ and carry out austenitizing, soaking time is about 35.3s, and lead patenting temperature is 435 ℃, and isothermal quenching time is about 24.7s, cold through 60 ℃ of laggard line spaces of water-cooled, then obtain finished product warehouse-in by traditional slitting japanning production technique.
Its finished product mechanical property is: tensile strength 940Mpa, unit elongation is 13%.
Embodiment 2
Choose a kind of carbon manganese steel that comprises following chemical composition: C:0.16%, Si:0.08%, Mn:1.35%, P:0.019%, S:0.009%, surplus is Fe, described percentage ratio is weight percentage.
Selecting the above-mentioned carbon manganese steel hot-rolled sheet that 3.3mm is thick is raw material, becomes the steel band of 0.9 * 199mm through pickling and cold-rolling, the mechanical property after it is cold rolling: tensile strength is 930MPa, and unit elongation is 6%.Then enter the equipment that carries out heat treating method of the present invention, carry out modifier treatment, whole heat treatment process steel belt operating speed 17m/min, be heated to 860 ℃ and carry out austenitizing, soaking time 35.3s, lead patenting temperature is 430 ℃, isothermal quenching time 24.7s, cold through 60 ℃ of laggard line spaces of water-cooled, then obtain finished product warehouse-in by traditional slitting japanning production process.
Its finished product mechanical property is: tensile strength 950Mpa, unit elongation is 12%.
Embodiment 3
Choose a kind of carbon manganese steel that comprises following chemical composition: C:0.17%, Si:0.09%, Mn:1.45%, P:0.019%, S:0.009%, surplus is Fe, described percentage ratio is weight percentage.
Selecting the above-mentioned carbon manganese steel hot-rolled sheet that 3.3mm is thick is raw material, becomes the steel band of 0.9 * 199mm through pickling and cold-rolling, the mechanical property after it is cold rolling: tensile strength is 920MPa, and unit elongation is 7%.Then enter the equipment that carries out heat treating method of the present invention, carry out modifier treatment, whole heat treatment process steel belt operating speed 15m/min, be heated to 860 ℃ and carry out austenitizing, the about 40s of soaking time, lead patenting temperature is 435 ℃, isothermal quenching time is about 28s, cold through 60 ℃ of laggard line spaces of water-cooled, then obtain finished product warehouse-in by traditional slitting japanning production process.
Its finished product mechanical property is: tensile strength 940Mpa, unit elongation is 13%.
Embodiment 4
Choose a kind of carbon manganese steel that comprises following chemical composition: C:0.17%, Si:0.09%, Mn:1.45%, P:0.019%, S:0.009%, surplus is Fe, described percentage ratio is weight percentage.
Selecting the above-mentioned carbon manganese steel hot-rolled sheet that 3.3mm is thick is raw material, becomes the steel band of 0.9 * 199mm through pickling and cold-rolling, the mechanical property after it is cold rolling: tensile strength is 920MPa, and unit elongation is 7%.Then enter the equipment that carries out heat treating method of the present invention, carry out modifier treatment, whole heat treatment process steel belt operating speed 15m/min, be heated to 860 ℃ and carry out austenitizing, soaking time 40s, lead patenting temperature is 430 ℃, isothermal quenching time 28s, cold through 60 ℃ of laggard line spaces of water-cooled, then obtain finished product warehouse-in by traditional slitting japanning production process.
Its finished product mechanical property is: tensile strength 945Mpa, unit elongation is 12%.
Embodiment 5
Choose a kind of carbon manganese steel that comprises following chemical composition: C:0.17%, Si:0.09%, Mn:1.45%, P:0.019%, S:0.009%, surplus is Fe, described percentage ratio is weight percentage.
Selecting the above-mentioned carbon manganese steel hot-rolled sheet that 3.3mm is thick is raw material, becomes the steel band of 0.9 * 199mm through pickling and cold-rolling, the mechanical property after it is cold rolling: tensile strength is 920MPa, and unit elongation is 7%.Then enter the equipment that carries out heat treating method of the present invention, carry out modifier treatment, whole heat treatment process steel belt operating speed 20m/min, be heated to 880 ℃ and carry out austenitizing, soaking time 30s, lead patenting temperature is 425 ℃, isothermal quenching time 21s, cold through 70 ℃ of laggard line spaces of water-cooled, then obtain finished product warehouse-in by traditional slitting japanning production process.
Its finished product mechanical property is: tensile strength 940Mpa, unit elongation is 12%.
The mechanical property test of the steel band in above-described embodiment is carried out on the XYA105C in Shanghai Baogang Packaging Steel Strip Co., Ltd. laboratory (CMT5105) microcomputer universal tensile testing machine, and sample adopts without mach full rectangular cross sectional shape.According to the company standard Q of Baoshan Iron & Steel Co., Ltd BQB908-2006 < < tie up with the steel belt for packages in steel band > > standard detection above-described embodiment, above-mentioned steel belt for packages tensile strength of mechanical property is not less than 940Mpa, unit elongation is not less than 12% steel belt for packages, meets the requirement of industrial high-intensity packing steel belt completely.
Finally be necessary explanation: above embodiment is only for being described in further detail technical scheme of the present invention; can not be interpreted as limiting the scope of the invention, some nonessential improvement that those skilled in the art's foregoing according to the present invention is made and adjustment all belong to protection scope of the present invention.

Claims (5)

1. a heat treating method for steel belt for packages, comprises the steps:
A) steel band is heated to the austenitizing temperature of 840~880 ℃, insulation 30~40s;
B) carry out isothermal quenching;
C) carbon tower is scraped lead;
D) water-cooled;
E) natural air cooling.
It is characterized in that: described step b), isothermal quenching is carried out in plumbous liquid at 425~435 ℃, and isothermal quenching time is 21~28s; The composition of described steel band and weight percent are C:0.15~0.20%, Si:0.05~0.2%, and Mn:1.30~1.6%, P≤0.030%, S≤0.030%, surplus is Fe.
2. heat treating method as claimed in claim 1, is characterized in that: described step a) in, when to described steel band heating, adopt described steel band is placed in to the mode heating under the protection of shielding gas heats.
3. heat treating method as claimed in claim 1, is characterized in that: described step a) in, when to described steel band heating, adopt the mode of electromagnetic induction coil heating in medium frequency to heat.
4. heat treating method as claimed in claim 1, is characterized in that: described step a) in, first by described steel band at described step b) in plumbous liquid in carry out preheating, be 6.75~9 seconds warm up time.
5. heat treating method as claimed in claim 1, is characterized in that: described steps d), carry out water-cooled in the water of 60 ± 10 ℃.
CN201410452789.4A 2014-09-05 2014-09-05 Heat treatment method of steel band for packaging Pending CN104178621A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001355041A (en) * 2000-06-13 2001-12-25 Kobe Steel Ltd Transformation-induced plastic plated steel sheet excellent in ductility and adhesion for plating and its production method
JP2007270341A (en) * 2006-03-06 2007-10-18 Jfe Steel Kk Method for producing hot dip galvanized steel sheet
CN101363078A (en) * 2008-09-25 2009-02-11 上海宝钢包装钢带有限公司 Heat treatment method of steel belt for packages and steel belt for packages
CN103436680A (en) * 2013-08-26 2013-12-11 武汉钢铁(集团)公司 Method for producing steel for binding straps with tensile strength of more than or equal to 990 MPa
CN103757530A (en) * 2014-01-24 2014-04-30 宝山钢铁股份有限公司 Thin strip continuous casting economic ultrahigh-strength binding strip with tensile strength of at least 1250 MPa and manufacturing method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001355041A (en) * 2000-06-13 2001-12-25 Kobe Steel Ltd Transformation-induced plastic plated steel sheet excellent in ductility and adhesion for plating and its production method
JP2007270341A (en) * 2006-03-06 2007-10-18 Jfe Steel Kk Method for producing hot dip galvanized steel sheet
CN101363078A (en) * 2008-09-25 2009-02-11 上海宝钢包装钢带有限公司 Heat treatment method of steel belt for packages and steel belt for packages
CN103436680A (en) * 2013-08-26 2013-12-11 武汉钢铁(集团)公司 Method for producing steel for binding straps with tensile strength of more than or equal to 990 MPa
CN103757530A (en) * 2014-01-24 2014-04-30 宝山钢铁股份有限公司 Thin strip continuous casting economic ultrahigh-strength binding strip with tensile strength of at least 1250 MPa and manufacturing method thereof

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Application publication date: 20141203