CN1141412C - band steel for shadow mask and its preparing process - Google Patents
band steel for shadow mask and its preparing process Download PDFInfo
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- CN1141412C CN1141412C CNB011131071A CN01113107A CN1141412C CN 1141412 C CN1141412 C CN 1141412C CN B011131071 A CNB011131071 A CN B011131071A CN 01113107 A CN01113107 A CN 01113107A CN 1141412 C CN1141412 C CN 1141412C
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Abstract
The present invention relates to shadow mask band steel for a color image tube and the production method thereof. The steel comprises the chemical constituents by weight percentage: at most 0.002% of C, 0.005 to 0.05% of Ti, 0.1 to 0.4% of Mn, 0 to 0.08% of Al, 0 to 0.015% of Nb, 0.001 to 0.03% of Cr, at most 0.03% of Si, and the balance of Fe. The steel has the production technical process of making steel, hot rolling, pickling and cold continuous rolling or acid rolling on-line operation, continuous annealing, leveling, finishing and completing the shadow mask band steel. The performance of the steel can satisfy the requirement of the color image tube, and the steel has the advantages of simple production technology, high productivity, short production period and low production cost.
Description
The present invention relates to a kind of shadow mask for colour image tube band steel and production method thereof.
Up to the present, the suitability for industrialized production of shadow mask for colour image tube band steel still adopts the method for secondary cold-rolling and middle decarburizing annealing in the world, and its main technique flow process is as follows:
Steel-making → hot rolling → pickling and cold rolling → cleaning by degreasing → loose winding decarburizing annealing → second time is cold rolling → cleaning by degreasing → straightening → finishing → band steel for shadow mask.
This traditional production technology is to adopt Ultra-low carbon pure iron (not containing Ti, Nb), after hot rolling, pickling and the first time are cold roller and deformed, carry out cleaning by degreasing, then pass through very long and expensive loose winding decarburizing annealing operation, passes through cold rolling for the second time, cleaning by degreasing and straightening finishing after the decarburizing annealing again.This traditional band steel for shadow mask production method is not because the steel grade of selecting for use contains strong carbide forming elements such as Ti, Nb, carbon in the steel mainly with the atomic state solid solution in the iron-based body, embarking on journey property of punching press and magnetic behavior influence to final finished are bigger, therefore must the carbon content of final finished be controlled at below about 5ppm with the method for middle decarburizing annealing, below 0.5%, yield strength is below 120Mpa with the yield extension of guaranteeing final finished.The main drawback of this method is a complex manufacturing, and production efficiency is low, and the production cycle is long, and energy consumption is big, and lumber recovery is low, and production cost is very high and unfavorable to environment protection.
The patent of international patent application no WO96/13618 provides a kind of and produces band steel for shadow mask with once cold rolling and stress relief annealed method.This patented technology adopts the method steel-making continuous casting of the Cr that adds 0.005～0.03% Nb and 0.02～0.06% in carbon content is lower than 0.004% Ultra-low carbon aluminium killed steel, continuously cast bloom is through 1200～1250 ℃ homogenizing extension anneal, then carry out hot rolling again, 900～940 ℃ of hot rolling finishing temperatures, 550～650 ℃ of hot rolling reeling temperature, this hot-rolled sheet directly carries out 85～90% once cold rolling, at last through 640～680 ℃ continuous annealing and smooth distortion, produce and have the band steel for shadow mask of formability and etching performance preferably.The main drawback of this method is because the higher poor-performing that makes final band steel for shadow mask of carbon content, the steel ageing resistance performance of adding small amount of N b in addition merely is relatively poor, can improve its ageing resistance performance though increase the addition of Nb, again its magnetic be brought bad influence simultaneously.From the production technique aspect, the simple steel grade continuous casting steel billet in the steel-making continuous casting process that adds Nb ftractures easily, the alloy amount of adding is more particularly evident, the steel of simple interpolation Nb is then responsive especially to hot-rolled process parameter in course of hot rolling, and the minor fluctuations of hot-rolled process parameter will make the tissue of material and performance that significant the variation taken place.In addition, the band steel recrystallization temperature of adding Nb merely is higher, must increase substantially annealing temperature in the annealing operation of finished product, increase energy consumption and make the easy wooden dipper song of product, plate shape is worsened, and last Nb is very expensive element, its price is higher than Ti far away, the production cost height.
The object of the present invention is to provide a kind of band steel for shadow mask and production method thereof, appropriate design by its Chemical Composition, thereby can adopt more sophisticated once cold rolling and stress relief annealed method to produce shady band steel, its performance really can satisfy the requirement of colour picture tube, and production technique obtains simplifying, boost productivity, shorten the production cycle and reduce production costs.
For achieving the above object, the present invention adopts following technical proposals:
A kind of band steel for shadow mask is characterized in that Chemical Composition is by weight percentage: C≤0.002%, and Ti0.005～0.05%, Mn0.1～0.4%, Al0～0.08%, Nb0～0.015%, Cr0.001～0.03%, Si≤0.03%, surplus is Fe.
Also contain N≤0.003% in the Chemical Composition, P≤0.012%, S≤0.008% and O≤0.002%.
A kind of production method of above-mentioned band steel for shadow mask, it is characterized in that the technological process of production is: on line → continuous annealing and smooth → finishing → band steel for shadow mask are rolled in steel-making → hot rolling → pickling and cold continuous rolling or acid.
The processing parameter of aforementioned production method is: the hot rolling reeling temperature is 660～750 ℃ to containing the Nb steel, is 620～715 ℃ to super ultra-low carbon steel; Cold rolling reduction is 87～93%; Whole unit elongation is 0.3～1.3%; It is ± 3 μ m that the finished product reach thickness and precision, plate shape wave height≤2mm, and surface roughness Ra is 0.3～0.6 μ m, peak density PC≤70, inclusion≤0.02/m
2
Principle of design of the present invention is as follows:
The present invention adopts ultra low-carbon steel (pure iron) or add a spot of strong carbide forming element Ti or Ti and Nb in ultra low-carbon steel, it is the IF steel, carbon is wherein mainly existed with the form of carbide, reduce the dissolved carbon content in the steel significantly, thereby guarantee the press formability of shadow mask board finished product; By to the appropriate design of steel chemical composition, steel-making continuous casting, hot rolling, cold rolling, annealing and flattening process technical parameter even comprise the adjustment and the optimization of user's final annealing parameter, make the material capability of band steel for shadow mask, the size, quantity, form and the distribution thereof that comprise its grain structure, inclusion can be satisfied its service requirements, the plate shape, dimensional precision, surface quality and the surfaceness that guarantee band steel for shadow mask in the scope of customer requirements, thereby guarantee its etching performance; By the Comprehensive Control of chemical ingredients, inclusion, final finished weave construction and grain fineness number, realize control to the shadow mask board magnetic property.
According to above-mentioned principle of design, we have proposed to add Ti or interpolation Ti and Nb or have directly adopted super utmost point low-carbon (LC) pure iron in ultra low-carbon steel be raw material, through the stringent regulations of strict slab quality control, hot-rolled temperature, hot-rolled sheet convexity, wedge shape and local high spot, cold rolling reduction, continuous annealing and smooth parameter control are carried out the production of band steel for shadow mask.
The plate shape of band steel for shadow mask, especially its planeness of band steel for shadow mask of producing by the method for once cold rolling is crucial quality index with the shape wave and the warpage of steel promptly, for the shape wave that guarantees band steel for shadow mask below 2mm, dangle angularity below 20mm, except in cold continuous rolling process, will adopting modern plate shape automatic control system (AFC), follow-up continuous annealing process, technology and operating parameters are wanted strict control, and particularly smooth technical parameter will rationally be set.
The surface of band steel for shadow mask does not allow any surface imperfection, to the belt steel surface roughness, comprises average surface roughness Ra, peak density, and promptly the peak value number on the unit length (PC or PPI) is strict.For the surface roughness Ra that guarantees band steel for shadow mask at 0.3～0.6 μ m, the PC value must be carried out the electrical spark texturing to smooth work roll surface more than 70, or the texturing of alternate manner, wants smooth Technology and the operating parameters of strict control simultaneously.
The present invention compared with the prior art, have conspicuous outstanding feature and advantage: band steel for shadow mask provided by the present invention is that a kind of its carbon content of super ultra-low carbon steel is extremely low, dissolved carbon content is in harmless scope, when carbon content reaches deleterious scope, then in ultra low-carbon steel, add strong carbide forming element Ti or Ti and Nb.Other element of steel grade of the present invention such as Mn, N, Al, P, O, Cr, S equal size are also lower in addition, guarantee its magnetic property.The processing method of producer of the present invention once cold rolling owned by France, and compare with existing once cold rolling technology, saved slab homogenizing diffusion annealing operation, and critical hot rolling such as hot rolling reeling temperature, cold rolling reduction and cold-rolling process technical parameter also have bigger improvement, the state of the art and the quality in kind of product are obviously improved, formed technical characterictic of the present invention.The present invention also can produce this cold-reduced sheet superfine product of band steel for shadow mask in modern TECHNIQUE TO LARGE INTEGRATED STEEL WORKS, and the production of band steel for shadow mask in the past all only is adapted at professional extremely strong professional little factory production.Band steel for shadow mask once cold rolling of the present invention and recovery annealing production technique can have modern steel-making, hot rolling in any family fully, Steel Complex cold rolling and continuous annealing apparatus implement, has the consistent management of being convenient to quality product, the technological process of production is simple, the production efficiency height, advantages such as the cycle is short, and production cost is low.
According to the difference of the band steel for shadow mask Chemical Composition of inventing, the invention will be further described by three embodiment below.
Embodiment 1:
Adopt the Ultra-low carbon aluminium killed steel that adds trace Ti, handle, and adopted the measure of various control inclusiones, produce continuous casting steel billet through conventional continuous casting process at last through RH refining vacuum outgas.The molten steel Chemical Composition sees the following form 1.
The Chemical Composition actual achievement of table 1 embodiment 1
| Chemical element | C | Mn | Si | P | S | Al* | N | O | Cr | Ti | Nb |
| Steel grade wt% of the present invention | 0.0013 | 0.15 | 0.014 | 0.007 | 0.0076 | 0.039 | 0.0025 | 0.0014 | 0.018 | 0.039 | 0 |
| Contrast steel grade wt% | 0.0033 | 0.23 | - | 0.009 | 0.008 | 0.0034 | 0.0028 | - | 0.035 | - | 0.013 |
* 0.039% is whole alumiunum amount, and 0.034% is sour molten aluminium amount
Also comprise other unavoidable impurities element, surplus is Fe.
Continuous casting steel billet is heated to the hot rolling cogging temperature before hot rolling, batch after roughing, finish rolling and laminar flow cooling.After the cooling of 2～3 days room temperatures, pass through CDCM unit (pickling and cold rolling) and CAPL unit (continuous annealing and smooth), at last on inspection, finishing procedures such as side cut and bundling produce the band steel for shadow mask finished product.Its main technique technical parameter sees the following form 2.
The hot rolling of table 2 embodiment 1 and cold-rolling process parameter actual achievement
| Technical data | The diffusion annealing of slab homogenizing | Slab heating temperature (℃) | Finishing temperature (℃) | Coiling temperature ℃ | Cold rolling reduction (%) | The continuous annealing temperature (℃) | Connect and move back soaking time (S) | Smooth unit elongation (%) |
| Technology of the present invention | Not | 1220 | 910 | 660 | 90 | 670 | 37 | 0.9 |
| Contrast technology | Necessary 1234 ℃ | 1220 | 920 | 600 | 87.5 | 655 | - | 0.8 |
The quality in kind technical indicator of band steel for shadow mask of the present invention such as following table 3.
The intermediates of table 3 embodiment 1 and end product quality technical indicator
| The quality in kind index | Inclusion content is (individual/m 2) | Grain structure and mechanical property after annealing for the second time | Band steel for shadow mask thickness and precision (μ m) | High (the mm of wave | Surfaceness | ||||||
| Grain fineness number | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) | Hardenability value n value | Yield extension (%) | Ra | PC | ||||
| (μm) | |||||||||||
| Product of the present invention | 0.004 | 7.0 level | 92 | 290 | 47 | 0.276 | 0 | ±2.5 | 1.0 | 0.5 | 85 |
| Contrast product | - | - | 105 | 282 | 47 | - | 0.1 | - | - | - | - |
Embodiment 2:
Adopt the Ultra-low carbon aluminium killed steel that adds trace Ti and Nb, handle, and adopted the measure of various control inclusiones, produce continuous casting steel billet through conventional continuous casting process at last through RH refining vacuum outgas.The molten steel Chemical Composition sees the following form 4.
The Chemical Composition actual achievement of table 4 embodiment 2
| Chemical element | C | Mn | Si | P | S | Al* | N | O | Cr | Ti | Nb |
| Steel grade wt% of the present invention | 0.0012 | 0.16 | 0.013 | 0.007 | 0.004 | 0.033 | 0.0019 | 0.0013 | 0.018 | 0.023 | 0.009 |
| Contrast steel grade wt% | 0.0030 | 0.13 | - | 0.012 | 0.006 | 0.041 | 0.0020 | - | 0.040 | - | 0.010 |
* 0.033% is total Al amount, and 0.041% is sour molten aluminium amount
Also comprise other unavoidable impurities element, surplus is Fe.
Continuous casting steel billet is heated to the hot rolling cogging temperature before hot rolling, batch after roughing, finish rolling and laminar flow cooling.After the cooling of 2～3 days room temperatures, pass through CDCM unit (pickling and cold rolling) and CAPL unit (continuous annealing and smooth), at last on inspection, finishing procedures such as side cut and bundling produce the band steel for shadow mask finished product.Its main technique technical parameter sees the following form 5.
The hot rolling of table 5 embodiment 2 and cold-rolling process parameter actual achievement
| Technical data | The diffusion annealing of slab homogenizing | Slab heating temperature (℃) | Finishing temperature (℃) | Coiling temperature ℃ | Cold rolling reduction (%) | The continuous annealing temperature (℃) | Connect and move back soaking time (S) | Smooth unit elongation (%) |
| Technology of the present invention | Not | 1210 | 915 | 705 | 90 | 675 | 37 | 0.8 |
| Contrast technology | Necessary 1230 ℃ | 1200 | 920 | 600 | 87.5 | 650 | - | 0.75 |
The quality in kind technical indicator of band steel for shadow mask of the present invention such as following table 6.
The intermediates of table 6 embodiment 2 and end product quality technical indicator
| The quality in kind index | Inclusion content is (individual/m 2) | Grain structure and mechanical property after annealing for the second time | Band steel for shadow mask thickness and precision (μ m) | Wave high (mm) | Surfaceness | ||||||
| Grain fineness number | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) | Hardenability value n value | Yield extension (%) | Ra | PC | ||||
| (μm) | |||||||||||
| Product of the present invention | 0.003 | 7.5 level | 95 | 295 | 46.1 | 0.27 | 0 | ±2.0 | 1.5 | 0.45 | 80 |
| Contrast product | - | - | 107 | 285 | 45.7 | - | 0.1 | - | - | - | - |
Embodiment 3:
Adopt the Ultra-low carbon aluminium killed steel that does not add any strong carbide forming element, handle, and adopted the measure of various control inclusiones, produce continuous casting steel billet through conventional continuous casting process at last through RH refining vacuum outgas.The molten steel Chemical Composition sees the following form 7.
The Chemical Composition actual achievement of table 7 embodiment 3
| Chemical element | C | Mn | Si | P | S | Al* | N | O | Cr | Ti |
| Steel grade wt% of the present invention | 0.0005 | 0.20 | 0.013 | 0.008 | 0.008 | 0.031 | 0.0018 | 0.0013 | 0.01 | 0.007 |
| Contrast steel grade wt% | 0.003 | 0.20 | - | 0.011 | 0.007 | 0.029 | 0.003 | - | 0.050 | 0 |
* 0.031% is whole alumiunum amount, and 0.029% is sour molten aluminium amount
Also comprise other unavoidable impurities element, surplus is Fe.
Continuous casting steel billet is heated to the hot rolling cogging temperature before hot rolling, batch after roughing, finish rolling and laminar flow cooling.After the cooling of 2～3 days room temperatures, pass through CDCM unit (pickling and cold rolling) and CAPL unit (continuous annealing and smooth), at last on inspection, finishing procedures such as side cut and bundling produce the band steel for shadow mask finished product.Its main technique technical parameter sees the following form 8.
The hot rolling of table 8 embodiment 3 and cold-rolling process parameter actual achievement
| Technical data | The diffusion annealing of slab homogenizing | Slab heating temperature (℃) | Finishing temperature (℃) | Coiling temperature ℃ | Cold rolling reduction (%) | The continuous annealing temperature (℃) | Connect and move back soaking time (S) | Smooth unit elongation (%) |
| Technology of the present invention | Not | 1230 | 925 | 670 | 90 | 580 | 37 | 0.85 |
| Contrast technology | Necessary 1230 ℃ | 1190 | 920 | 735 | 75 | 540 | - | 1.3 |
The quality in kind technical indicator of band steel for shadow mask of the present invention such as following table 9.
The intermediates of table 9 embodiment 3 and end product quality technical indicator
| The quality in kind index | Inclusion content is (individual/m 2) | Grain structure and mechanical property after annealing for the second time | Band steel for shadow mask thickness and precision (μ m) | Wave high (mm) | Surfaceness | ||||||
| Grain fineness number | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) | Hardenability value n value | Yield extension (%) | Ra | PC | ||||
| (μm) | |||||||||||
| Product of the present invention | 0.002 | 7.0 level | 94 | 286 | 46 | - | 0.1 | ±2.5 | 1.3 | 0.54 | 88 |
| Contrast product | - | 157 | 243 | 50 | - | 5.0 | - | - | - | - | |
Claims (3)
1. band steel for shadow mask is characterized in that Chemical Composition is by weight percentage:
C≤0.002％，
Ti：0.005～0.05，
Mn：0.1～0.4％，
Al：0～0.08％，
Nb：0～0.015％，
Cr：0.001～0.03％
Si≤0.03％，
Surplus is Fe.
2. band steel for shadow mask according to claim 1 is characterized in that by weight percentage, also contains N≤0.003% in the Chemical Composition, P≤0.012%, S≤0.008% and O≤0.002%.
3. production method according to the described band steel for shadow mask of claim 1, it is characterized in that the technological process of production is: on line → continuous annealing and smooth → finishing → band steel for shadow mask are rolled in steel-making → hot rolling → pickling and cold continuous rolling or acid; Processing parameter is: the hot rolling reeling temperature is 660～750 ℃ to containing the Nb steel, is 620～715 ℃ to super ultra-low carbon steel; Cold rolling reduction is 87～93%; Smooth unit elongation is 0.3～1.3%; It is ± 3 μ m that the finished product reach thickness and precision, plate shape wave height≤2mm, and surface roughness Ra is 0.3～0.6 μ m, peak density PC≤70, inclusion≤0.02/m
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011131071A CN1141412C (en) | 2001-06-26 | 2001-06-26 | band steel for shadow mask and its preparing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011131071A CN1141412C (en) | 2001-06-26 | 2001-06-26 | band steel for shadow mask and its preparing process |
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| CN1330165A CN1330165A (en) | 2002-01-09 |
| CN1141412C true CN1141412C (en) | 2004-03-10 |
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| CNB011131071A Expired - Lifetime CN1141412C (en) | 2001-06-26 | 2001-06-26 | band steel for shadow mask and its preparing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007003109A1 (en) * | 2005-06-30 | 2007-01-11 | Baoshan Iron & Steel Co., Ltd. | Once-cold-rolled steel strip for shadow mask and its manufacture process |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021278B (en) * | 2009-09-22 | 2012-12-19 | 宝山钢铁股份有限公司 | Extreme low carbon steel manufacturing method and extreme low carbon steel manufactured by same |
| CN102719731B (en) * | 2012-06-28 | 2016-03-02 | 宝山钢铁股份有限公司 | Secondary cold-rolling band steel for shadow mask and manufacture method thereof |
| CN103878173B (en) * | 2012-12-21 | 2016-03-02 | 鞍钢股份有限公司 | Production method for eliminating surface color difference of cold-rolled plate |
-
2001
- 2001-06-26 CN CNB011131071A patent/CN1141412C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007003109A1 (en) * | 2005-06-30 | 2007-01-11 | Baoshan Iron & Steel Co., Ltd. | Once-cold-rolled steel strip for shadow mask and its manufacture process |
| CN100430511C (en) * | 2005-06-30 | 2008-11-05 | 宝山钢铁股份有限公司 | Cold rolled strip steel for shadow mask and its making process |
| JP2008545060A (en) * | 2005-06-30 | 2008-12-11 | 宝山鋼鉄股▲分▼有限公司 | Manufacturing method of primary cold-rolled shadow mask steel strip |
| KR101049303B1 (en) | 2005-06-30 | 2011-07-13 | 바오샨 아이론 앤 스틸 유한공사 | Single cold rolled strip steel for shadow mask and manufacturing method thereof |
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| CN1330165A (en) | 2002-01-09 |
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