CN108220748A - The manufacturing method of household electrical appliances cold rolling low-carbon glassed steel - Google Patents

The manufacturing method of household electrical appliances cold rolling low-carbon glassed steel Download PDF

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CN108220748A
CN108220748A CN201711440367.5A CN201711440367A CN108220748A CN 108220748 A CN108220748 A CN 108220748A CN 201711440367 A CN201711440367 A CN 201711440367A CN 108220748 A CN108220748 A CN 108220748A
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steel
manufacturing
cold rolling
temperature
household electrical
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CN108220748B (en
Inventor
杨跃标
邓深
樊雷
陈海
叶姜
刘崇林
袁勤攀
蒋才灵
张广川
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Liuzhou Iron and Steel Co Ltd
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Liuzhou Iron and Steel Co Ltd
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Priority to CN201911307909.0A priority Critical patent/CN111074139B/en
Priority to CN201911308494.9A priority patent/CN111057940B/en
Priority to CN201911308041.6A priority patent/CN111020354B/en
Priority to CN201911308609.4A priority patent/CN111118388B/en
Priority to CN201911308292.4A priority patent/CN111074140B/en
Priority to CN201711440367.5A priority patent/CN108220748B/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The present invention provides a kind of household electrical appliances manufacturing methods of cold rolling low-carbon glassed steel.The manufacturing method includes：Blast-melted smelting, desulfurizing iron pretreatment, converter molten steel smelting, liquid steel refining processing, sheet billet continuous casting, hot continuous rolling, pickling cold continuous rolling, annealing and it is smooth.The present invention realizes the steady production of the product, product has excellent fish scaling resistance, adhesion property, anti-deforming deformation performance and processability by the smelting of optimization, continuous casting, hot rolling, cold rolling, the technique annealed.

Description

The manufacturing method of household electrical appliances cold rolling low-carbon glassed steel
Technical field
The present invention relates to metallurgical steel rolling fields, and in particular to a kind of household electrical appliances cold rolling low-carbon glassed steel and its manufacturing method, Such as the household electrical appliances such as water heater and oven cold rolling low-carbon glassed steel and its manufacturing method.
Background technology
Enamelware is long, specious, easy to clean, safe and non-toxic with corrosion-resistant, wear-resistant, high temperature resistant, service life The features such as, thus extensively using every field such as household electrical appliances productions.Enamelware is typically by steel plate after punch process shapes Bottom embryo is made, the enamel application of slip is then carried out on the surface of bottom embryo and is sintered, therefore it requires steel plate to have good punching press Performance, fish scaling resistance, adhesion property and anti-deforming performance.
The general steel plate that enamelware such as water heater and oven of traditional household electrical appliances production field etc. largely use It is produced as raw material, general steel plate is being warded off although can ensure in punching performance and anti-deforming aspect of performance The defects of squama is quick-fried, adherence is bad is often generated during porcelain, these defects seriously constrain the quality of enamelware.With The application range of enamel product constantly expands, and the requirement to enamel quality is also higher and higher, and general steel plate can not meet enamel The high request of quality, the enamel special-purpose steel only with excellent application of slip performance could adapt to the development need of Enamel Industry completely.
The common production technology of household electrical appliances cold rolling glassed steel includes both at home and abroad at present：1) titanium (Ti) microalloying technique, should Technique be mainly using in steel such as Second Phase Precipitations objects such as TiN, TiS, Ti4C2S2 and Ti (C, N) as hydrogen trap to carry The fish scaling resistance of high steel plate.This technique major problem is that precipitated phase in steel is complicated, in hot rolling and cold rolled annealed The precipitate type of the precipitated phase of Ti in the process and the technology controlling and process window of size are more stringent, the technique control to production scene Precise requirements height processed；In addition, Ti microalloying techniques are primarily adapted for use in ultra-low-carbon steel, for general cold-rolled low carbon steel, adopt Take the technique that can deteriorate the enamel adhesion property of steel and the quick-fried performance of squama to a certain extent.2) Re microalloyings technique, the technique Mainly by adding a certain amount of rare earth element into steel, make to obtain the Re Second Phase Precipitation objects of small and dispersed distribution in steel The inclusion modifications such as the Al2O3 in steel is made to become fine uniform simultaneously, to improve the fish scaling resistance of steel plate.The master of steel technique Problem is wanted to be that Re elements are too active and atomic density is big, the stability contorting of alloying technology and constituent content is difficult Degree is big, and large-scale denaturation inclusion density is relatively difficult to float greatly.3) hyperoxia (O) technique, the technique are mainly the O controlled in steel For content in higher range, general control is used as hydrogen trap to improve steel plate in more than 100ppm by the oxide in steel Fish scaling resistance.The main problem of steel technique is that the Control for Oxygen Content technique of smelting process is more difficult, continuous casting manufacturing technique More difficult to control, there are the probability of gas hole defect is larger for surface of steel plate.4) boron (B) technique, the technique mainly add one into steel Fixed micro B element, is used as hydrogen trap to improve the fish scaling resistance of steel plate by the compound of the boron such as the BN in steel.Steel work The main problem of skill is that the continuous casting billet of B microalloyings easily generates surface transverse cracks defect, can be genetic to subsequent steel plate Surface influences application of slip performance.
In conclusion problems with exists in the prior art：The production cost of household electrical appliances cold rolling glassed steel is high, and technique is multiple It is miscellaneous.
Invention content
The present invention provides a kind of manufacturing method of household electrical appliances cold rolling low-carbon glassed steel, to solve household electrical appliances cold rolling glassed steel The problem of production cost is high, complex process.
The present invention proposes a kind of manufacturing method for producing household electrical appliances cold rolling low-carbon glassed steel, and the manufacturing method includes following The processing step carried out successively：Blast-melted smelting, desulfurizing iron pretreatment, converter molten steel is smelted, liquid steel refining is handled, plate Base continuous casting, hot continuous rolling, pickling cold continuous rolling, annealing and it is smooth；
Wherein, in converter molten steel smelting step：Molten iron controls S≤0.040Wt%；Smelting process is using whole bottom blowing nitrogen Gas；
In liquid steel refining processing step：Deoxidation and the alloying technology of Al, Mn, N and S are carried out, wherein, N microalloyings are adopted It is carried out with addition nitrided ferromanganese alloy, S alloying technologies are carried out by the way of addition sulphur iron or hello sulphur line, and molten steel carries out Ca Processing is controlled by [Ca]/[Als]=0.10~0.14, and Ca processing terminates ladle and carries out soft blow 8~15min of argon, soft blow argon knot Beam to continuous casting steel unwraps ladle molten steel calmness time control between pouring in 15~30min.
Further, in sheet billet continuous casting step：The automatic Lower proterozoic group control of the ladle that comes into operation, the basket pouring degree of superheat press 10 ~30 DEG C, middle packet is using alkaline covering agent, and using low-carbon steel protecting slag, Casting speed is 1.20~1.60m/min, using knot Brilliant device liquid fluctuating automatically controls, and fluctuation range is controlled in ± 3mm.
Further, in hot continuous rolling step：It is 1100~1250 DEG C to control slab heating temperature；Finishing temperature control exists 850~950 DEG C；600~700 DEG C of coiling temperature.
Further, in pickling cold continuous rolling step：Cold rolling reduction ratio 65~80%.
Further, in annealing steps, using bell-type annealing or continuous annealing；
Wherein, bell-type annealing：Using full hydrogen purge；Holding temperature of annealing is 660~730 DEG C, soaking time 11 of annealing ~14h controls cooldown rate≤20 DEG C/h, and control is cooled to 380 DEG C, tapping temperature≤80 DEG C；
Continuous annealing：Soaking zone temperature is 780~870 DEG C, 50~170s of soaking time, slow cooling outlet temperature 640~690 DEG C, 320~450 DEG C of rapid cooling outlet temperature, 360~450 DEG C of overaging section temperature, 200~350s of time.
Further, in planarization step：Smooth elongation percentage is controlled according to different steel thickness by 0.7~1.6%.
Further, the household electrical appliances are C with cold rolling low-carbon glassed steel chemical component weight percentage：0.03%~ 0.08Wt%, Si≤0.03Wt%, Mn：0.25%~0.60Wt%, P≤0.020Wt%, S：0.015%~0.040Wt%, Als (sour aluminum melting)：0.015%~0.040Wt%, N：0.0050%~0.0120Wt%, surplus for Fe and inevitably it is micro- Secondary element.
Further, Ti≤0.020Wt%, Mn/S >=15.
Further, the household electrical appliances are C with cold rolling low-carbon glassed steel chemical component weight percentage：0.06Wt%, Si： 0.02Wt%, Mn：0.30Wt%, P：0.013Wt%, S：0.018Wt%, Als：0.029Wt%, N：0.0061Wt%, Ti≤ 0.020Wt%, Mn/S >=15, surplus trace element for Fe and inevitably.
Further, the household electrical appliances are C with cold rolling low-carbon glassed steel chemical component weight percentage：0.05Wt%, Si： 0.02Wt%, Mn：0.53Wt%, P：0.010Wt%, S：0.033Wt%, Als：0.018Wt%, N：0.0114Wt%, Ti≤ 0.020Wt%, Mn/S >=15, surplus trace element for Fe and inevitably.
Further, the household electrical appliances are C with cold rolling low-carbon glassed steel chemical component weight percentage：0.05Wt%, Si： 0.02Wt%, Mn：0.53Wt%, P：0.010Wt%, S：0.033Wt%, Als：0.018Wt%, N：0.0114Wt%, Ti≤ 0.020Wt%, Mn/S >=15, surplus trace element for Fe and inevitably.
The present invention does not need to addition Ti, Re, B by rational composition design and technology controlling and process, it is not required that in control steel High O content, only by controlling suitable C, Mn, Als, S, N content, by the smelting of optimization, continuous casting, hot rolling, cold rolling, move back The technique of fire, realizes the steady production of the product, and product has excellent fish scaling resistance, adhesion property, anti-deforming Deformation performance and processability.It is 170~260MPa that the cold rolling low-carbon glassed steel yield strength of gained of the invention, which is Rp0.2, is resisted Tensile strength Rm is 280~370MPa, elongation percentage A80mm >=34%, n90 >=0.16, r90 >=1.4.The present invention meets household electrical appliances life The two-sided application of slip of production and enamel technology, while be also adapted to wet method and dust coat technique twice.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now illustrate the present invention.
The household electrical appliances cold rolling low-carbon glassed steel of the present invention, the steel grade chemical component weight percentage are C：0.03%~ 0.08Wt%, Si≤0.03Wt%, Mn：0.25%~0.60Wt%, P≤0.020Wt%, S：0.015%~0.040Wt%, Als：0.015%~0.040Wt%, N：0.0050%~0.0120Wt%, Ti≤0.020Wt%, Mn/S >=15, surplus are Fe and inevitably trace element.Wherein, the present invention has carried out control as follows chemical composition：
The C of the present invention：0.03%-0.08%, the C in steel can promote the analysis of cementite, pearlite and other carbide Go out as hydrogen trap to improve the fish scaling resistance of steel；While one of most effective intensified element makes the intensity of steel in C or steel It improves, but the plasticity of steel can also reduced, therefore C content is generally less than 0.10Wt%.The cold rolling glassed steel of the present invention is come It says, to ensure fish scaling resistance and high temperature enamel firing intensity, C is improved as possible under the premise of ensuring processability there is no problem Content.
Si≤0.03% of the present invention, Si is harmful element in glassed steel, and Si contents height can not only damage enamel property, And it forms the very poor oxide of ductility and is mingled with the plasticity for reducing steel, therefore the lower the control of Si contents the better.
The Mn of the present invention：0.25%~0.60%, S：0.015%~0.040%.Mn can play crystal grain thinning in steel Effect, while Mn also reacted with S generation MnS plasticity be mingled with play the role of hydrogen trap improve fish scaling resistance.But S contains The excessively high FeS of Fe elements production low melting point being easy in steel is measured, steel plate is made to lead to the problem of edge surface defect, so must protect Demonstrate,prove Mn/S >=15 in steel.The present invention makes to generate a certain amount of MnS in steel and is mingled with simultaneously by improving Mn contents and S in steel Achieve the purpose that improve fish scaling resistance by certain crystal grain thinning.
The Als (sour aluminum melting) of the present invention：0.015~0.040%, N：0.0050%~0.0150%.Al can be in steel Play the role of crystal grain thinning, while Al reacts the Al of generation with O (oxygen) and N2O3It can be as the hydrogen trap in steel with AlN Fish scaling resistance is improved, but the Al2O3 field trashes in steel excessively deteriorate the plasticity of steel.The present invention is by improving the Als in steel Content and N content make to generate a certain amount of AlN in steel while by certain crystal grain thinning reach to improve fish scaling resistance Purpose.
P≤0.020% of the present invention, P is harmful element, and easily segregation on the crystal boundary in steel, is easily produced in enamel firing Anger bubble and stain influence the surface quality of enamel, therefore the lower control the better.
The manufacturing method of the present invention, process route are：Blast-melted smelting → desulfurizing iron pretreatment → converter molten steel Smelting → LF liquid steel refinings processing (or the processing of RH liquid steel refinings) → sheet billet continuous casting → hot continuous rolling → pickling cold continuous rolling → bell furnace Annealing (or continuous annealing) → smooth → test package storage；Wherein, the process characteristic in each stage is：
Converter molten steel is smelted：Molten iron controls S≤0.040Wt%；Smelting process is using whole bottom blowing nitrogen；
LF liquid steel refinings processing (or the processing of RH liquid steel refinings)：The alloying technologies such as deoxidation and Al, Mn, N, S are carried out, In, N microalloyings are carried out using nitride alloys such as addition nitrided ferromanganeses, and S alloying technologies are using addition sulphur iron or feed sulphur line Mode carry out, molten steel carry out Ca processing, by [Ca]/[Als]=0.10~0.14 control, Ca processing terminate ladle carry out it is soft 8~15min of Argon, soft blow argon terminate to unwrap ladle molten steel calmness time control between pouring in 15~30min to continuous casting steel.
Sheet billet continuous casting：It is required that the automatic Lower proterozoic group control of the ladle that comes into operation, the basket pouring degree of superheat press 10~30 DEG C, middle packet Using alkaline covering agent, using low-carbon steel protecting slag, Casting speed is 1.20~1.60m/min, using liquid level fluctuation of crystallizer It automatically controls, fluctuation range is controlled in ± 3mm.
Hot continuous rolling：It is 1100~1250 DEG C to control slab heating temperature, makes the abundant austenitizing of steel billet and the overwhelming majority Alloying element fully dissolves, and the tissue uniformly to be refined is prepared；Finishing temperature control ensures at 850~950 DEG C Austenite low-temperature space has enough deformations, while avoids deforming to obtain mixed crystal in two-phase section, makes what hot rolled plate was uniformly refined Tissue；600~700 DEG C of coiling temperature, makes the cementite of steel grade fully be precipitated, while ensure structure refinement as possible.
Pickling cold continuous rolling：Cold rolling reduction ratio 65~80%, big cold deformation can make the subsequent anneal process of steel plate It is middle to obtain tiny grain size and the cementite compared with low mass distribution, while dislocation density is improved, so as to improve hydrogen trap number Amount and fish scaling resistance.
Annealing process：Suitable parameter and annealing can be such that steel plate fully recrystallizes, crystal grain isometry, cementite disperse It is precipitated, so as to which steel plate be made to obtain good mechanical property and fish scaling resistance.Annealing process is broadly divided into bell-type annealing and continuous Annealing.1) bell-type annealing：Using full hydrogen purge, the cleaning of furnace atmosphere and the cleaning of belt steel surface are realized；Annealing heat preservation temperature It is 660~730 DEG C to spend, and anneal 11~14h of soaking time, controls cooldown rate≤20 DEG C/h, and control is cooled to 380 DEG C, comes out of the stove Temperature≤80 DEG C.2) continuous annealing：Soaking zone temperature is 780~870 DEG C, 50~170s of soaking time, slow cooling outlet temperature 640~690 DEG C, 320~450 DEG C of rapid cooling outlet temperature, 360~450 DEG C of overaging section temperature, 200~350s of time.
Flattening process：Smooth elongation percentage is controlled according to different steel thickness by 0.7~1.6%, primarily to disappearing Except tensile yield platform existing for strip after recrystallization annealing, shape wave is eliminated, improves surface quality.
It is 170~260MPa that the cold rolling low-carbon glassed steel yield strength of gained of the invention, which is Rp0.2, and tensile strength Rm is 280~370MPa, elongation percentage A80mm >=34%, n90 >=0.16, r90 >=1.4.The present invention by rational composition design and Technology controlling and process, do not need to addition Ti, Re, B, it is not required that control steel in high O content, only by control suitable C, Mn, Als, S, N content by the smelting of optimization, continuous casting, hot rolling, cold rolling, the technique annealed, realize the steady production of the product, Product has excellent fish scaling resistance, adhesion property, anti-deforming deformation performance and processability.The present invention meets house The two-sided application of slip of electricity production and enamel technology, while be also adapted to wet method and dust coat technique twice.
The production method of the household electrical appliances cold rolling low-carbon glassed steel of the present invention is matched using following compositions and concrete technology.Its In, table 1 is the ingredient (by weight percentage) of each embodiment steel.Table 2 is technological parameter corresponding with example described in table 1.Table 3 be comprehensive performance corresponding with 1 each example of table.
1 product chemical composition (wt%) of table
Example C Si Mn P S Als N
Example 1 0.06 0.02 0.30 0.013 0.018 0.029 0.0061
Example 2 0.07 0.02 0.41 0.014 0.024 0.021 0.0082
Example 3 0.05 0.03 0.53 0.010 0.033 0.018 0.0114
Example 4 0.08 0.03 0.32 0.009 0.017 0.020 0.0055
Example 5 0.06 0.01 0.43 0.011 0.025 0.034 0.0073
Example 6 0.04 0.02 0.52 0.015 0.034 0.026 0.0128
The 2 specific technological parameter of each embodiment of table
The comprehensive performance of cold rolling low-carbon enamel obtained by 3 each embodiment of table
The meaning of Rp0.2 is yield strength, and Rm is tensile strength, and A80mm is elongation percentage, and the meaning of n90 is strain hardening Index, the meaning of r90 is plastic strain ratio.
The foregoing is merely the schematical specific embodiments of the present invention, are not limited to the scope of the present invention.For this Each component part of invention can be combined with each other under conditions of not conflicting, any those skilled in the art, not depart from this Made equivalent variations and modification, should all belong to the scope of protection of the invention under the premise of the design of invention and principle.

Claims (10)

1. a kind of household electrical appliances manufacturing method of cold rolling low-carbon glassed steel, which is characterized in that the manufacturing method includes next coming in order The processing step of progress：Blast-melted smelting, desulfurizing iron pretreatment, converter molten steel is smelted, liquid steel refining is handled, slab connects Casting, hot continuous rolling, pickling cold continuous rolling, annealing and it is smooth；
Wherein, in converter molten steel smelting step：Molten iron controls S≤0.040Wt%；Smelting process is using whole bottom blowing nitrogen；
In liquid steel refining processing step：Deoxidation and the alloying technology of Al, Mn, N and S are carried out, wherein, N microalloyings, which use, to be added Nitrided ferromanganese alloy is added to carry out, S alloying technologies are carried out by the way of addition sulphur iron or hello sulphur line, and molten steel carries out Ca processing, It is controlled by [Ca]/[Als]=0.10~0.14, Ca processing terminates ladle and carries out soft blow 8~15min of argon, and soft blow argon terminates to even Cast steel unwraps ladle molten steel calmness time control between pouring in 15~30min.
2. manufacturing method as described in claim 1, which is characterized in that household electrical appliances cold rolling low-carbon enamel steel chemical composition weight Amount percentage is C：0.03%~0.08Wt%, Si≤0.03Wt%, Mn：0.25%~0.60Wt%, P≤0.020Wt%, S： 0.015%~0.040Wt%, Als：0.015%~0.040Wt%, N：0.0050%~0.0120Wt%.
3. manufacturing method as described in claim 1, which is characterized in that household electrical appliances cold rolling low-carbon enamel steel chemical composition weight It measures in percentage, Mn/S >=15, Ti≤0.020Wt%.
4. manufacturing method as described in claim 1, which is characterized in that in sheet billet continuous casting step：The automatic slag inspection of the ladle that comes into operation Observing and controlling system, the basket pouring degree of superheat press 10~30 DEG C, and middle packet is using alkaline covering agent, and using low-carbon steel protecting slag, strand is drawn Speed is 1.20~1.60m/min, is automatically controlled using liquid level fluctuation of crystallizer, and fluctuation range is controlled in ± 3mm.
5. manufacturing method as described in claim 1, which is characterized in that in hot continuous rolling step：Control slab heating temperature be 1100~1250 DEG C；Finishing temperature control is at 850~950 DEG C；600~700 DEG C of coiling temperature.
6. manufacturing method as described in claim 1, which is characterized in that in pickling cold continuous rolling step：Cold rolling reduction ratio 65~ 80%.
7. manufacturing method as described in claim 1, which is characterized in that in annealing steps, using bell-type annealing, the bell-type moves back Fire：Using full hydrogen purge；Holding temperature of annealing is 660~730 DEG C, and anneal 11~14h of soaking time, control cooldown rate≤ 20 DEG C/h, control is cooled to 380 DEG C, tapping temperature≤80 DEG C.
8. manufacturing method as described in claim 1, which is characterized in that in annealing steps, using continuous annealing；It is described continuously to move back Fire：Soaking zone temperature is 780~870 DEG C, 50~170s of soaking time, 640~690 DEG C of slow cooling outlet temperature, rapid cooling terminal temperature 320~450 DEG C of degree, 360~450 DEG C of overaging section temperature, 200~350s of time.
9. manufacturing method as described in claim 1, which is characterized in that in planarization step：Smooth elongation percentage is according to different steel Thickness is controlled by 0.7~1.6%.
10. manufacturing method as described in claim 1, which is characterized in that household electrical appliances cold rolling low-carbon enamel steel chemical composition Weight percent is C：0.06Wt%, Si：0.02Wt%, Mn：0.30Wt%, P：0.013Wt%, S：0.018Wt%, Als： 0.029Wt%, N：0.0061Wt%, Ti≤0.020Wt%, surplus trace element for Fe and inevitably.
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