CN102732780B - Hot galvanized plate used for refrigerator outer plate, and production method thereof - Google Patents
Hot galvanized plate used for refrigerator outer plate, and production method thereof Download PDFInfo
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- CN102732780B CN102732780B CN 201210205829 CN201210205829A CN102732780B CN 102732780 B CN102732780 B CN 102732780B CN 201210205829 CN201210205829 CN 201210205829 CN 201210205829 A CN201210205829 A CN 201210205829A CN 102732780 B CN102732780 B CN 102732780B
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Abstract
The invention discloses a hot galvanized plate used for a refrigerator outer plate, and a production method thereof. The hot galvanized plate comprises the chemical components of, by mass: 0.020-0.10% of C, no more than 0.04% of Si, 0.20-0.50% of Mn, no more than 0.015% of P, no more than 0.015% of S, 0.020-0.060% of Alt, no more than 0.0040% of N, and balance of Fe and trace elements. The invention also discloses a method used for producing the hot galvanized plate used for the refrigerator outer plate. The hot galvanized plate provided by the invention has properties of high strength and low aging, and can satisfy performance requirements of steel used in refrigerator outer plate. The refrigerator outer plate hot galvanized plate production method provided by the invention adopts processes such as reasonable chemical component designing, hot rolling, cold rolling, and hot galvanizing, such that high-strength and low-aging hot galvanized steel plate is obtained, and refrigerator outer plate performance requirements of high strength and low aging can be satisfied.
Description
Technical field
The invention belongs to technical field of steel rolling, be specifically related to heat zinc coating plate and production method thereof for a kind of refrigerator outside plate.
Background technology
Household electrical appliances with heat zinc coating plate as one of elaboration sheet material of cold rolling kind, there are wide market outlook, particularly China is as household electrical appliances production and consumption big country, and household electric appliances are the highest priorities that each big steel enterprise competitively dabbles always, especially under China's household electrical appliances are gone to the countryside the overall background of policy.Exploitation is also the important symbol of weighing iron and steel enterprise's cold-rolled products quality with producing high-quality appliance plate.
The refrigerator outside plate is sheet material the strictest in appliance plate to the requirement of steel always, and it not only is embodied in the high request of Surface Quality, is also embodied in the high request of its intensity to steel plate and ageing resistance energy.Colour coated plate is the development trend of appliance plate outside plate, and the refrigerator outside plate is to supply the refrigerator outside plate after color coating with heat zinc coating plate by the steel plate major part.We know, color coating just is equivalent to artificial aging, so it requires to have low aging performance to steel plate.In addition, because the refrigerator inner panel needs the high-pressure injection moulding lagging material, high strength is conducive to prevent the pit that collides with simultaneously, so the refrigerator outside plate is had relatively high expectations to armor plate strength.Therefore how economic, stable, production refrigerator outside plate in batches with the heat zinc coating plate of the low timeliness of high strength always each big steel enterprise capture this commanding elevation of appliance plate concentrate on studies " trump card ".
Summary of the invention
The object of the invention is to, a kind of heat zinc coating plate and production method thereof for the refrigerator outside plate with high strength, low aging performance is provided.
According to an aspect of the present invention, a kind of refrigerator outside plate heat zinc coating plate provided, its chemical composition mass percent is:
C:0.020～0.10wt%, Si≤0.04wt%, Mn:0.20～0.50wt%, P≤0.015wt%, S≤0.015wt%, Alt:0.020～0.060wt%, N≤0.0040wt%, surplus is Fe and trace element.
According to another aspect of the present invention, a kind of above-mentioned refrigerator outside plate method with heat zinc coating plate of producing provided comprises: by molten steel by refining after the slab of continuous casting acquisition mentioned component;
Described slab is heated, then obtained hot-rolled sheet through roughing, finish rolling, then described hot-rolled sheet is carried out to laminar flow cooling, coiled into hot rolled coil after cooling;
By described hot rolled coil by the chill volume of cold rolling acquisition;
Described chill volume, after continuous annealing process to obtain the band steel, then, through pot galvanize, polishing, is then coiled into to finished product.
Further, described by molten steel by refining after continuous casting obtain slab and be:
Molten iron, after KR desulfurization processing, conventional converter steelmaking, CAS/RH refining treatment, then is carried out to the slab that continuous casting obtains high cleanliness.
Further, described slab is heated, then is obtained hot-rolled sheet through roughing, finish rolling, then hot-rolled sheet is carried out to laminar flow cooling, coil into hot rolled coil after cooling and be:
Described slab is heated, and Heating temperature is 1200～1350 ℃, and be 2～5 hours heat-up time;
Described slab is obtained to needed width of plate slab, obtains intermediate blank through two roller roughing, four roller roughing again through fixed-width pressure machine;
Described intermediate blank is obtained to hot-rolled sheet by finish rolling;
Enable stay-warm case between roughing and finish rolling, guarantee the homogeneity of intermediate blank temperature;
Described hot-rolled sheet is coiled into to hot rolled coil after laminar flow is cooling.
Further, the finishing temperature of described hot-rolled sheet is that 890～910 ℃, coiling temperature are 500 ~ 700 ℃;
The cooling employing leading portion of described laminar flow is cooling mode fast.
Further, describedly by hot rolled coil, by the chill volume of cold rolling acquisition, be:
By hot rolled coil through the straightening scale breading;
Hot rolled coil after the straightening scale breading is removed to its scale on surface by continuous turbulent pickling, then through tandem mills, carry out the cold rolling chill volume of making.
Further, described hot rolled coil carries out when cold rolling, and cold rolling draft is 65 ~ 85%.
Further, described described chill volume processed and obtained the band steel through continuous annealing, then through pot galvanize, polishing, then coil into finished product and be:
By the described chill Continuous Hot Dip Galvanizing ingress uncoiling crop material loading that twists in, then through cleaning section, clean and remove its surface and oil contaminant;
Chill volume after described cleaning is carried out to anneal by vertical continuous annealing furnace and obtain the band steel;
By described obtain the coating needed after zinc pan gas cutter with steel after, then carry out after polishing, straightening entering the passivation unit through polishing machine and carry out surface passivation, then batch as finished product.
Further, in described hot galvanizing process, the heating zone temperature is 690 ~ 760 ℃.
Further, described polishing machine polishing unit elongation is controlled at 0.5 ~ 1.5% according to the belt steel thickness specifications vary.
A kind of refrigerator outside plate heat zinc coating plate provided by the invention, have the performance that high strength is hanged down timeliness, meets the performance requriements with steel to the refrigerator outside plate.The production method of heat zinc coating plate for a kind of refrigerator outside plate provided by the invention, for meeting the performance requriements of refrigerator outside plate by the low timeliness of steel high strength, obtain the hot-dip galvanizing sheet steel of the low timeliness of high strength by chemical composition reasonable in design, hot rolling, cold rolling and hot dip galvanizing process system.
Embodiment
The invention provides a kind of refrigerator outside plate of embodiment heat zinc coating plate, for meeting the performance requriements of refrigerator outside plate by the low timeliness of steel high strength, obtain the hot-dip galvanizing sheet steel of the low timeliness of high strength by chemical composition reasonable in design, hot rolling, cold rolling and hot dip galvanizing process system.
From cost consideration, improving C content is the most effectual way that improves armor plate strength, but this steel grade need to hang down timeliness, and C content again can not be too high, and this is the conflict point.Therefore the Composition Design theory is suitably to improve C content, does not add alloying constituent to reduce composition, by rolling reasonable in design and hot dip galvanizing process system to obtain the high-intensity low timeliness that has simultaneously.Through many kinds of tests show to adopt this composition system coordinate this rolling technology can realize economy, in batches, the heat zinc coating plate of the low timeliness of high strength for stable production refrigerator outside plate.This refrigerator outside plate by the chemical composition mass percent of heat zinc coating plate is: C:0.020～0.10wt%, Si≤0.04wt%, Mn:0.20～0.50wt%, P≤0.015wt%, S≤0.015wt%, Alt:0.020～0.060wt%, N≤0.0040wt%, surplus is Fe and trace element.
The embodiment of the present invention also provides a kind of this refrigerator outside plate of producing to comprise by the method for heat zinc coating plate:
Step S1: by molten steel by refining after continuous casting obtain the slab of the described composition of claim 1.Specifically by molten iron after KR desulfurization processing, conventional converter steelmaking, CAS/RH refining treatment, carry out again the slab of continuous casting acquisition high cleanliness, the chemical composition mass percent is: C:0.020～0.10wt%, Si≤0.04wt%, Mn:0.20～0.50wt%, P≤0.015wt%, S≤0.015wt%, Alt:0.020～0.060wt%, N≤0.0040wt%, surplus is Fe and trace element.。
Step S2: described slab is heated, then obtain hot-rolled sheet through roughing, finish rolling, then described hot-rolled sheet is carried out to laminar flow cooling, coil into hot rolled coil after cooling;
Step S3: by described hot rolled coil by the chill volume of cold rolling acquisition; Specifically by hot rolled coil through the straightening scale breading; Hot rolled coil after the straightening scale breading is removed to its scale on surface by continuous turbulent pickling, then through 5 Stands Cold Tandem Mill group rollings, obtain chill volume.Hot rolled coil carries out when cold rolling, and cold rolling draft is 65 ~ 85%.
Step S4: described chill volume, after continuous annealing process to obtain the band steel, then, through pot galvanize, polishing, is then coiled into to finished product.
Wherein, step S2: slab is heated, then obtain hot-rolled sheet through roughing, finish rolling, then hot-rolled sheet is carried out to laminar flow cooling, coil into hot rolled coil after cooling to comprise:
Step S11: described slab is heated, and Heating temperature is 1200～1350 ℃, and be 2～5 hours heat-up time;
Step S12: described slab is obtained to needed width of plate slab, obtains intermediate blank through two roller roughing, four roller roughing again through fixed-width pressure machine, and the roughing pattern adopts the 3+3 pattern, to improve its output;
Step S13: described intermediate blank is obtained to hot-rolled sheet by finish rolling, and the finishing temperature of hot-rolled sheet is 890～910 ℃;
Step S14: enable stay-warm case between roughing and finish rolling, guarantee the homogeneity of intermediate blank temperature;
Step S15: described hot-rolled sheet is coiled into to hot rolled coil after laminar flow is cooling, and the cooling employing leading portion of laminar flow is cooling mode fast, and coiling temperature is 500 ~ 700 ℃.
Step S4: described chill volume, after continuous annealing process to obtain the band steel, then, through pot galvanize, polishing, is then coiled into to finished product and comprises:
Step S41: by the described chill Continuous Hot Dip Galvanizing ingress uncoiling crop material loading that twists in, then through cleaning section, clean and remove its surface and oil contaminant;
Step S42: the chill volume after described cleaning is carried out to anneal by vertical continuous annealing furnace and obtain the band steel;
Step S43: by described obtain the coating needed after zinc pan gas cutter with steel after, then carry out after polishing, straightening entering the passivation unit through polishing machine and carry out surface passivation, then batch as finished product.In hot galvanizing process, the heating zone temperature is 690 ~ 760 ℃, and polishing machine polishing unit elongation is controlled at 0.5 ~ 1.5% according to the belt steel thickness specifications vary.
A kind of refrigerator outside plate heat zinc coating plate provided by the invention, have the performance that high strength is hanged down timeliness, meets the performance requriements with steel to the refrigerator outside plate.The production method of heat zinc coating plate for a kind of refrigerator outside plate provided by the invention, for meeting the performance requriements of refrigerator outside plate by the low timeliness of steel high strength, obtain the hot-dip galvanizing sheet steel of the low timeliness of high strength by chemical composition reasonable in design, hot rolling, cold rolling and hot dip galvanizing process system.
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment mono-:
Molten iron, after KR desulfurization processing, conventional converter steelmaking, CAS/RH refining processing, then is carried out to continuous casting; Its slab smelting component: C:0.030wt%, Si:0.01wt%, Mn:0.20wt%, P:0.005wt%, S:0.005wt%, Alt:0.030wt%, N:0.0028wt%, surplus is Fe substantially.
By 1200 ℃ of heating of plate blanks, be 2 hours heat-up time, and finishing temperature is 890 ℃, and coiling temperature is 580 ℃; Then enter after the broken phosphorus of uncoiling straightening on sour milling train group after its scale on surface is removed in the pickling of shallow slot turbulent flow and enter 5 Stands Cold Tandem Mills, draft is 80%; Finally after the uncoiling of Continuous Hot Dip Galvanizing ingress, cleaning, enter vertical continuous annealing furnace, the heating zone temperature is 750 ℃, and fast cold section temperature is 470 ℃, then after smooth (smooth unit elongation is 0.8%), batches as finished product.The refrigerator outside plate heat zinc coating plate that finally to obtain specification be 0.45mm * 1250mm.Its yield strength, tensile strength and elongation after fracture A80 index are respectively 295MPa, 365MPa and 33%; The yield point elongation length of its stress strain curve is less than 1%, possesses good ageing resistance performance.
Embodiment bis-:
Molten iron, after KR desulfurization processing, conventional converter steelmaking, CAS/RH refining processing, then is carried out to continuous casting; Its slab smelting component: C:0.05wt%, Si:0.02wt%, Mn are 0.28wt%, P:0.010wt%, S:0.010wt%, Alt:0.040wt%, N:0.0020wt%, and surplus is Fe substantially.
By 1260 ℃ of heating of plate blanks, be 3.5 hours heat-up time, and finishing temperature is 900 ℃, and coiling temperature is 640 ℃; Then enter after the broken phosphorus of uncoiling straightening on sour milling train group after its scale on surface is removed in the pickling of shallow slot turbulent flow and enter 5 Stands Cold Tandem Mills, draft is 80%; Finally after the uncoiling of Continuous Hot Dip Galvanizing ingress, cleaning, enter vertical continuous annealing furnace, the heating zone temperature is 750 ℃, and fast cold section temperature is 470 ℃, then after smooth (smooth unit elongation is 1.0%), batches as finished product.The refrigerator outside plate heat zinc coating plate that finally to obtain specification be 0.50mm * 1250mm.Its yield strength, tensile strength and elongation after fracture A80 index are respectively 290MPa, 365MPa and 35%; The yield point elongation length of its stress strain curve is less than 1%, possesses good ageing resistance performance.
Embodiment tri-:
Molten iron, after KR desulfurization processing, conventional converter steelmaking, CAS/RH refining processing, then is carried out to continuous casting; Its slab smelting component: C:0.10wt%, Si:0.02wt%, Mn:0.35wt%, P:0.015wt%, S:0.015wt%, Alt:0.060wt%, N:0.0036wt%, surplus is Fe substantially.
By 1250 ℃ of heating of plate blanks, be 4 hours heat-up time, and finishing temperature is 910 ℃, and coiling temperature is 680 ℃; Then enter after the broken phosphorus of uncoiling straightening on sour milling train group after its scale on surface is removed in the pickling of shallow slot turbulent flow and enter 5 Stands Cold Tandem Mills, draft is 85%; Finally after the uncoiling of Continuous Hot Dip Galvanizing ingress, cleaning, enter vertical continuous annealing furnace, the heating zone temperature is 750 ℃, and fast cold section temperature is 470 ℃, then after smooth (smooth unit elongation is 0.9%), batches as finished product.The refrigerator outside plate heat zinc coating plate that finally to obtain specification be 0.45mm * 1250mm.Its yield strength, tensile strength and elongation after fracture A80 index are respectively 280MPa, 355MPa and 36%; The yield point elongation length of its stress strain curve is less than 1%, possesses good ageing resistance performance.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (7)
1. the production method of a refrigerator outside plate use heat zinc coating plate, is characterized in that, comprising:
By molten steel by refining after continuous casting obtain the slab of following composition;
The chemical composition mass percent of described slab is: C:0.10wt%, Si≤0.04wt%, Mn:0.35～0.50wt%, P≤0.015wt%, S≤0.015wt%, Alt:0.020～0.060wt%, N≤0.0040wt%, and surplus is Fe and trace element;
Described slab is heated, then obtained hot-rolled sheet through roughing, finish rolling, then described hot-rolled sheet is carried out to laminar flow cooling, coiled into hot rolled coil after cooling;
By described hot rolled coil by the chill volume of cold rolling acquisition;
By the described chill Continuous Hot Dip Galvanizing ingress uncoiling crop material loading that twists in, then through cleaning section, clean and remove its surface and oil contaminant;
Chill volume after described cleaning is carried out to anneal by vertical continuous annealing furnace and obtain the band steel;
By described obtain the coating needed after zinc pan gas cutter with steel after, then carry out after polishing, straightening entering the passivation unit through polishing machine and carry out surface passivation, then batch as finished product, in described hot galvanizing process, the heating zone temperature is 690～760 ℃.
2. production method as claimed in claim 1, is characterized in that, described by molten steel by refining after continuous casting obtain slab and be:
Molten iron, after KR desulfurization processing, conventional converter steelmaking, CAS/RH refining treatment, then is carried out to continuous casting and obtains slab.
3. production method as claimed in claim 1, is characterized in that, described slab heated, then obtain hot-rolled sheet through roughing, finish rolling, then hot-rolled sheet carried out to laminar flow cooling, coils into hot rolled coil after cooling to be:
Described slab is heated, and Heating temperature is 1200～1350 ℃, and be 2～5 hours heat-up time;
Described slab is obtained to needed width of plate slab, obtains intermediate blank through two roller roughing, four roller roughing again through fixed-width pressure machine;
Described intermediate blank is obtained to hot-rolled sheet by finish rolling;
Enable stay-warm case between roughing and finish rolling, guarantee the homogeneity of intermediate blank temperature;
Described hot-rolled sheet is coiled into to hot rolled coil after laminar flow is cooling.
4. production method as claimed in claim 3 is characterized in that:
The finishing temperature of described hot-rolled sheet is that 890～910 ℃, coiling temperature are 500～700 ℃;
The cooling employing leading portion of described laminar flow is cooling mode fast.
5. production method as claimed in claim 1, is characterized in that, describedly by hot rolled coil, by the chill volume of cold rolling acquisition, is:
By described hot rolled coil through the straightening scale breading;
Described hot rolled coil after the straightening scale breading is removed to its scale on surface by continuous turbulent pickling, then through tandem mills, carry out the cold rolling chill volume of making.
6. production method as claimed in claim 5 is characterized in that:
Described hot rolled coil carries out when cold rolling, and cold rolling draft is 65～85%.
7. production method as claimed in claim 1 is characterized in that:
Described polishing machine polishing unit elongation is controlled at 0.5～1.5% according to the belt steel thickness specifications vary.
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| CN103290319A (en) * | 2013-04-28 | 2013-09-11 | 首钢总公司 | Cold rolling plate for single layer Bundy tube and production method thereof |
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| JP5549307B2 (en) * | 2009-04-13 | 2014-07-16 | Ｊｆｅスチール株式会社 | Cold-rolled steel sheet excellent in aging and bake hardenability and method for producing the same |
| CN102174683B (en) * | 2011-01-30 | 2012-10-10 | 首钢总公司 | Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property |
| CN102416404B (en) * | 2011-09-21 | 2014-05-28 | 首钢总公司 | Method for producing cold-rolled steel strips |
| CN102534365B (en) * | 2011-12-28 | 2014-04-02 | 首钢总公司 | Aluminum killed steel hot dip galvanized sheet and production method thereof |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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