CN1275173A - Method for manufacturing high adherence enamel-coating steel sheet with superior formability - Google Patents
Method for manufacturing high adherence enamel-coating steel sheet with superior formability Download PDFInfo
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- CN1275173A CN1275173A CN 99801438 CN99801438A CN1275173A CN 1275173 A CN1275173 A CN 1275173A CN 99801438 CN99801438 CN 99801438 CN 99801438 A CN99801438 A CN 99801438A CN 1275173 A CN1275173 A CN 1275173A
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- steel
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- 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
-
- 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
- C21D8/0236—Cold rolling
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A method for manufacturing a cold rolled steel sheet to be enamel-coated and to be used as raw steel sheets for enamel-coated products such as bath tubs and components of electric appliances is disclosed. The optimum contents of the alloying elements such as S, P and N are realized, thereby satisfying the enamel layer adherence, the fishscale resistance and the formability. First, there is prepared a steel composed of, in weight %, 0.004 % or less of C, 0.3 % or less of Mn, 0.02-0.05 % of S, 0.005-0.03 % of P, 0.08-0.15 % of Ti, 0.04 % or less of N, 0.004 % or more of an excess Ti<*> (being defined to be Ti<*> = Ti -(48/32)S -(48/14)N -(48/12)C), and a balance of Fe and other unavoidable impurities so as to form an aluminum killed steel. The aluminum killed steel is reheated, and then a hot rolling is carried out, with the finish rolling temperature being above the Ar3 transformation point. Then a coiling is carried out in the normal manner, and then, a cold rolling is carried out with a reduction rate of 50-85 %. A continuous annealing is carried out above the recrystallization temperature.
Description
Invention field
The present invention relates to a kind of as scribbling the goods of enamel paint, as bathtub and electrical element, the manufacture method of raw-material cold-rolled steel sheet.More particularly, the present invention relates to a kind of manufacture method of cold-rolled steel sheet, wherein said steel plate is truly having higher level aspect characteristics such as enamel paint layer binding property, anti-fish scale and formability.
Background of invention
The cold-rolled steel sheet that can apply enamel paint usually is pressed into different shape, carries out enamel paint coating then on its surface, and at high temperature fires, thereby finish the manufacturing of the cold-rolled steel sheet goods that scribble enamel paint.Requiring the main characteristic of the cold-rolled steel sheet goods of coating enamel paint is the binding property of anti-fish scale, formability and former steel plate and enamel paint interlayer.
The binding property of enamel paint layer depends on the element and the surfaceness of interpolation.
Fish scale is meant the defective that forms on the surface that scribbles the enamel paint goods.When manufacturing scribbled the goods of enamel paint, the solid solution matter hydrogen in the steel can discharge in process of cooling or afterwards in other words.Because the pressure of hydrogen breaks the enamel paint layer of this hard system, is similar to cataphracted defective and form.For fear of this fish scale phenomenon, need be provided for storing the space of hydrogen in the steel.The very big influence of the throw out that this is subjected to existing in the steel plate or the kind of non-metallic inclusions and amount.Proposed at present by in steel, adding Ti, B, N or O
2Prevent the fish scale phenomenon to form known hydrogen absorption sources such as titanium sulfide, titanium nitride, titanium carbide, boron nitride, manganese oxide.According to this kind mode, with throw out or oxide precipitation, or high carbon steel carry out decarburizationization, to guarantee anti-fish scale.Therefore, the present steel great majority that propose are for adding titanium steel, adding boron guiding principle, high-oxygen steel or decarburized steel.
Simultaneously, formability is also extremely important, because before coating enamel paint, the cold-rolled steel sheet that must will apply enamel paint is pressed into needed shape.
Japanese Patent is openly announced the manufacture method that clear-63-500 has disclosed the steel plate of coating enamel paint.The composition of described steel comprises by weight percentage: 0.005% or lower carbon, 0.03% or lower silicon, 0.5% or lower manganese, 0.02% or lower phosphorus, 0.03% or the nitrogen of lower sulphur, 0.005-0.01%, 0.15% or lower titanium [Ti＞(48/12C+48/14N+48/32S)], 0.08% or lower copper, total add-on be 0.003-0.03% be selected from one or more elements in the group of forming by As, Sb and Bi, surplus is iron and other unavoidable impurities.But the content of N is very high in this steel, therefore, if the TiN throw out is exposed to the surface of steel, can form bubble.
And korean patent application 97-63270 has disclosed the manufacture method of the steel plate of another kind of coating enamel paint.In the method, the composition of described steel comprises by weight percentage: 0.01% or lower carbon, 0.3% or the titanium of the sulphur of the phosphorus of lower manganese, 0.05-0.1%, 0.02-0.04%, 0.04-0.10%, 0.005% or lower nitrogen, Ti/ (C+N+S)] atomic ratio be 1.0 or higher, surplus be iron and other unavoidable impurities.But, the content height of P in this steel, therefore, although the intensity of these steel can be accepted its plasticity variation.
As mentioned above, also do not develop the cold-rolled steel sheet of coating enamel paint so far with gratifying enamel paint layer binding property, anti-fish scale and formability.And existing problem is to have to lose other characteristics when obtaining some characteristic.
Summary of the invention
The present invention is intended to overcome the shortcoming of above-described routine techniques.
Therefore, an object of the present invention is to provide a kind of cold-rolled steel sheet that applies enamel paint, alloying element in the wherein said steel plate such as S, P, N, Ti and effective Ti (Ti
*) content reaches optimum value, thereby satisfied enamel paint layer binding property, anti-fish scale and the formability of acquisition.
For achieving the above object, the manufacture method that applies the cold-rolled steel sheet of enamel paint of the present invention comprises following each step: prepare a kind of steel, it is formed by weight percentage, comprising: 0.004% or lower carbon, 0.3% or the titanium of the phosphorus of the sulphur of lower manganese, 0.02-0.05%, 0.005-0.03%, 0.08-0.15%, 0.004% or lower nitrogen, 0.04% or more excessive Ti
*(it is defined as Ti
*=Ti-(48/32) S-(48/14) N-(48/12) C), surplus is iron and other unavoidable impurities, to form a kind of aluminium killed steel; This aluminium killed steel of reheat; Hot rolling system, finishing temperature is more than the Ar3 change point; Batch in a conventional manner then; Follow contraction ratio cold rolling with 50-85%; And carry out continuous annealing under the recrystallization temperature being higher than.Detailed description of the preferred embodiment
The manufacture method that applies the cold-rolled steel sheet of enamel paint of the present invention comprises the following steps: to prepare a kind of steel, it is formed by weight percentage, comprising: 0.004% or lower carbon, 0.3% or the titanium of the phosphorus of the sulphur of lower manganese, 0.02-0.05%, 0.005-0.03%, 0.08-0.15%, 0.004% or lower nitrogen, 0.04% or more excessive Ti
*(it is defined as Ti
*=Ti-(48/32) S-(48/14) N-(48/12) C), surplus is iron and other unavoidable impurities, to form a kind of aluminium killed steel; This aluminium killed steel of reheat; Carry out hot rolling system, finishing temperature is higher than Ar
3Change point; Batch in a conventional manner then; Follow contraction ratio cold rolling with 50-85%; And carry out continuous annealing under the recrystallization temperature being higher than.
To describe the numerical value of the limiting factor of composition of the present invention below in detail.
If C content is higher than 0.004%, then this solid solution matter carbon can be excessive.Therefore in annealing process, the formation of the structure of described steel is hindered, or the throw out of meticulous titanium carbide can be excessive.Thereby, the described particle thinner formability variation that makes that becomes.Therefore carbon content must be limited in 0.004% or lower.
Add manganese,, thereby prevented to make the pyrocondensation phenomenon that causes by the FeS film so that solid solution matter sulphur is with the form precipitation of manganese sulfide.Yet, among the present invention, add titanium and make the form precipitation of sulphur, thereby removed residual sulfur fully with titanium sulfide.Therefore needn't add Mn respectively.In addition, if Mn exists with the solid solution state, the intensity of this steel can increase, but its formability variation.Therefore, Mn content should be preferably limited to 0.3% or lower.
Usually, sulphur is considered to destroy the element of mechanical property, but among the present invention, the adding of sulphur has strengthened anti-fish scale.If sulphur content is lower than 0.02%, the amount of titanium sulfide and size can be not enough, and the result can not improve anti-fish scale.If sulphur content is more than 0.05%, excessive titanium and makes the formability variation very little.Therefore, sulphur content should be preferably limited in the 0.02-0.05%, more preferably is limited in the 0.02-0.03% to guarantee better formability.
As S, P also is a kind of element that makes the mechanical property variation.Therefore, its content should be low as far as possible.But in the present invention, the P of adding is by forming Ti (Fe, P) throw out and improved anti-fish scale with Ti reaction back.If P content is lower than 0.005%, (Fe, P) throw out can not form Ti, therefore can not improve anti-fish scale.If P content is higher than 0.03%, (Fe, P) sedimentary formation make the particle of recrystallize become too thin, and the result makes the formability variation owing to meticulous Ti.Therefore, P content should be limited in the 0.005-0.03%.
Ti removes solid solution matter C and N with the form of titanium carbide and titanium nitride, thereby improves the formability of raw steel.In addition, titanium is by precipitation titanium sulfide (TiS) and Ti (Fe, throw out P) and improve anti-fish scale.If its content is lower than 0.08%, the sedimentary precipitation capacity of titanium can not be improved anti-fish scale very little.If the content of titanium is higher than 0.15%, it is big that the titanium throw out becomes, and improve anti-fish scale.But because higher Ti
*Can make the poor adhesion of enamel paint layer.Therefore, the content of titanium should be limited in the 0.08-0.15%.
N and Ti reaction have improved anti-fish scale with the form precipitation of titanium nitride.Yet, if titanium nitride is exposed to the surface of steel plate, oxidizing reaction can take place, produce nitrogen, and make the surface that defective take place.Therefore, nitrogen content should be low as much as possible.If nitrogen content is lower than 0.004%, titanium nitride causes the possibility of surface imperfection just very low with small amount of precipitate.Therefore nitrogen content should be 0.004% or lower.
Excessive Ti
*Be defined as Ti
*=Ti-(48/32) S-(48/14) N-(48/12) C.Titanium and N, S and C reaction form TiN, TiS and TiC.The element of supposing all addings all precipitates, excessive Ti
*Be meant residual solid solution matter titanium.In fact, the element of all addings can complete reaction, therefore because excessive Ti
*Amount very big, residual more completely solid solution matter C and N are precipitated out.In addition, (Fe, P) sedimentary precipitation has been improved anti-fish scale to Ti.If excessive Ti
*Amount be higher than 0.04%, have remaining solid solution matter C and N hardly, therefore can guarantee to have the r value and be 2.0 or higher formability.When the r value 2.0 or when higher, described steel can form complicated shape.(Fe, P) throw out can obtain enough anti-fish scales owing to have an amount of Ti in addition.Therefore, excessive Ti
*Lower limit should be 0.04%.Particularly, if excessive Ti
*Amount be lower than 0.04%, therefore (Fe, P) throw out have reduced anti-fish scale not form Ti.
Creating conditions of steel of the present invention is described below.
The aluminium killed steel that will have above-mentioned composition carries out reheat and hot rolling system.Under this condition, finishing temperature should be higher than Ar
3Change point.Its reason is if hot rolling is being lower than Ar
3Carry out under the temperature of change point, can form rolling particle and make the formability variation.
After hot rolling system, batch in a conventional manner, be limited in compression ratio then and carry out cold rolling within the 50-85%.The throw out that forms in hot rolling system process is damaged in the cold rolling process or extends.In this course of processing, form little hole, and these holes even after continuous annealing, still remain intact harmless with as the absorption of hydrogen source.In this regard, need the cold rolling compression ratio of control.That is to say that if cold rolling compression ratio is lower than 50%, the sum in little hole has reduced the absorption of hydrogen very little, causes the fish scale phenomenon easily.On the other hand,,, reduced the gross space in little hole certainly, just greatly reduced the receptivity of hydrogen because high compression ratio subsides little hole if cold rolling compression ratio is higher than 85%.
After cold rolling, in a conventional manner steel carried out continuous annealing and handle.I.e. this continuous annealing is handled being higher than under the recrystallization temperature and is carried out.
Below will present invention is described according to the embodiment of reality.Embodiment
Preparation has the steel ingot that table 1 is formed, and carries out hot rolling in smelting furnace after keeping 1 hour under 1250 ℃.This hot rolled finishing temperature is 900 ℃, batches under 650 ℃ then.Last thickness is 3.2 millimeters.This hot rolling sample is carried out pickling remove its surperficial oxide film.Be to carry out cold rolling 70% time at compression ratio then.
The sample that this is cold rolling further is processed into enamel paint sample and stretching sample.Then these two kinds of samples are carried out continuous annealing.
The enamel paint sample is cut into 70 millimeters * 150 millimeters size, and according to the standard form drawing sample of ASTM E-8.Carrying out continuous annealing in 30 seconds under 830 ℃ temperature handles.
Use the tension testing machine (Model6025) of Instron company that the stretching sample is tested.Its yield strength, tensile strength, elongation and r value are measured, and the results are shown in Table 2.
The enamel paint sample is carried out complete degrease handle, then it was soaked 5 minutes in sulphuric acid soln (10%, 70 ℃).Then use the hot water injection, and this sample was soaked 5 minutes down at 85 ℃ in the aqueous solution of 3.6 grams per liter sodium carbides+1.2 grams per liter boraxs, neutralize.Finish the The pretreatment process.Then, apply enamel paint on sample, drying is 10 minutes under 200 ℃, and removes moisture fully.After the drying, sample is placed on 830 ℃ kept 7 minutes down, then fire, carry out air cooling at last, finish the enamel paint coating process.
Under this condition, the atmosphere of described baking furnace has 30 ℃ dew-point temperature.Formed serious harm like this, promptly the easiest generation fish scale phenomenon.Behind the coating enamel paint,, sample was placed in 200 ℃ the stove baking 20 hours in order to quicken the fish scale phenomenon, the quantity of visual inspection fish scale defective then, the results are shown in Table 2.
For the fusible evaluation of enamel paint, use a kind of binding property test machine (based on ASTMC313-78) to measure the binding property index.
Table 1
| Steel | Chemical constitution (weight %) | ????Ti | Cold-rolled compression is than (%) | ||||||
| ????C | ??Mn | ????P | ????S | ????Ti | ????N | ||||
| Steel of the present invention | ??1 | ??0.0025 | ??0.12 | ??0.015 | ??0.023 | ??0.098 | ??0.0021 | ??0.046 | ????70 |
| ??2 | ??0.0018 | ??0.23 | ??0.008 | ??0.025 | ??0.114 | ??0.0018 | ??0.063 | ||
| ??3 | ??0.0033 | ??0.15 | ??0.012 | ??0.025 | ??0.121 | ??0.0019 | ??0.064 | ||
| ??4 | ??0.0014 | ??0.20 | ??0.010 | ??0.022 | ??0.118 | ??0.0015 | ??0.074 | ||
| Comparative steel | ??1 | ??0.0042＾ | ??0.22 | ??0.014 | ??0.042＾ | ??0.095 | ??0.0030 | ??0.005＾ | |
| ??2 | ??0.0012 | ??0.25 | ??0.011 | ??0.012＾ | ??0.095 | ??0.0045＾ | ??0.057 | ||
| ??3 | ??0.0023 | ??0.26 | ??0.013 | ??0.032＾ | ??0.182＾ | ??0.0030 | ??0.115 | ||
| ??4 | ??0.0015 | ??0.14 | ??0.011 | ??0.038＾ | ??0.072＾ | ??0.0021 | ??0.002＾ | ||
| Conventional steel | ??1 | ??0.0039 | ??0.15 | ??0.010 | ??0.013＾ | ??0.122 | ??0.0075＾ | ??0.061 | |
| ??2 | ??0.0029 | ??0.25 | ??0.015 | ??0.028 | ??0.132 | ??0.0082＾ | ??0.050 | ||
| ??3 | ??0.0025 | ??0.20 | ??0.058＾ | ??0.025 | ??0.110 | ??0.0032 | ??0.052 | ||
^ represents to depart from the situation of condition of the present invention.
Table 2
| Test block | The enamel paint characteristic | Mechanical property | Remarks | ||||||
| Fish scale incidence (inferior) | Enamel paint thickness (micron) | Binding property index (%) | Yield strength (kilogram force/millimeter 2) | Tensile strength (kilogram force/millimeter 2) | Elongation (%) | The r value | |||
| Material of the present invention | ??1 | ????0 | ????131 | ???100 | ????12.2 | ????31.3 | ?48.6 | ?2.15 | Steel 1 of the present invention |
| ??2 | ????0 | ????103 | ????97 | ????13.3 | ????31.8 | ?47.6 | ?2.25 | Steel 2 of the present invention | |
| ??3 | ????0 | ????110 | ????96 | ????13.8 | ????30.9 | ?47.3 | ?2.28 | Steel 3 of the present invention | |
| ??4 | ????0 | ????121 | ????99 | ????12.3 | ????29.9 | ?48.9 | ?2.38 | Steel 4 of the present invention | |
| Contrast material | ??1 | ????0 | ????100 | ????97 | ????15.8 | ????32.4 | ?44.3 | ?1.72 | Comparative steel 1 |
| ??2 | ????25 | ????135 | ???100 | ????12.1 | ????30.9 | ?49.0 | ?2.25 | Comparative steel 2 | |
| ??3 | ????0 | ????104 | ????83 | ????14.6 | ????32.3 | ?46.8 | ?2.37 | Comparative steel 3 | |
| ??4 | ????38 | ????120 | ????99 | ????15.9 | ????33.1 | ?44.0 | ?1.72 | Comparative steel 4 | |
| Conventional material | ??1 | ????0 | ????99 | ????85 | ????13.6 | ????31.7 | ?46.4 | ?2.12 | Conventional steel 1 (surface imperfection) |
| ??2 | ????0 | ????135 | ????92 | ????12.7 | ????30.8 | ?46.8 | ?2.05 | Conventional steel 2 (generation surface imperfection) | |
| ??3 | ????0 | ????115 | ????92 | ????22.4 | ????36.4 | ?42.8 | ?1.82 | Conventional steel 3 | |
Shown in table 1 and 2, material 1-4 of the present invention show 2.0 or higher r value to guarantee the height formability.In addition, under height damage condition the fish scale phenomenon not taking place, shows good anti-fish scale.Its enamel paint layer binding property is higher than 95%.
In contrast, the S content of contrast material 1 therefore the fish scale phenomenon does not take place, but its C content is up to 0.042% up to 0.042%.Excessive Ti
*Amount be low to moderate 0.005%, so the r value just in time is 1.7, its formability is very low as a result.
The excessive Ti of contrast material 2
*Amount up to 0.057%, its r value is 2.25, its formability is good as a result.But its S content is low to moderate 0.012%, has therefore formed 25 fish scale defectives.So this steel plate can not be used for the enamel paint coating.
In the contrast material 3, S content is 0.032%, and therefore the fish scale phenomenon does not take place.In addition, excessive Ti
*Amount be 0.115%, therefore its r value is 2.37, has reached high formability.Yet Ti content is up to 0.182%, so its enamel paint layer binding property is low to moderate 83%.So this material can not be used for the enamel paint coating.
In the contrast material 4, S content is up to 0.038%, and Ti content is low to moderate 0.072%, and 38 place's fish scale defectives have appearred in the result.Excessive in addition Ti
*Amount be low to moderate 0.002%, so the r value just in time is 1.72, its formability is very low as a result.
In the conventional material 1 and 2, Ti content is respectively up to 0.122% and 0.110%, and N content is also respectively up to 0.0075% and 0.0082%.Therefore, because the formation of coarse grain titanium compound in the steel, and the fish scale defective does not take place.Excessive in addition Ti
*Amount be 0.061%, its r value is up to 2.12, its formability is good as a result.Yet there is a large amount of coarse grain TiN compounds to be present in the surface of described steel plate,, and makes the surface that defective take place owing to the generation of unusual air pocket.
In the conventional material 3, P content is up to 0.058%, so its yield strength is too high, and shows low r value, and formability is low as a result.When therefore these class steel are used to form complicated shape, may will the crack take place.
The above-mentioned description according to the present invention, the steel plate that can obtain to have good enamel paint layer binding property, anti-fish scale and formability.And steel plate of the present invention is suitable for being pressed into complicated shape.
Claims (2)
1. manufacture method that can apply the cold-rolled steel sheet of enamel paint, this method comprises following each step:
Prepare a kind of steel, it is formed by weight percentage, for: 0.004% or lower carbon, 0.3% or the titanium of the phosphorus of the sulphur of lower manganese, 0.02-0.05%, 0.005-0.03%, 0.08-0.15%, 0.004% or lower nitrogen, 0.04% or more excessive Ti
*(it is defined as Ti
*=Ti-(48/32) S-(48/14) N-(48/12) C), surplus is iron and other unavoidable impurities, to form a kind of aluminium killed steel;
This aluminium killed steel of reheat;
This aluminium killed steel of hot rolling system, finishing temperature is higher than Ar
3Change point;
This aluminium killed steel is batched in a conventional manner;
Contraction ratio with 50-85% is cold rolling; With
Being higher than under the recrystallization temperature, carry out continuous annealing.
2. the process of claim 1 wherein that the content of sulphur is 0.02-0.03%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1998/35267 | 1998-08-28 | ||
| KR19980035267A KR100360095B1 (en) | 1998-08-28 | 1998-08-28 | Manufacturing method of high adhesion enameled steel sheet with excellent formability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1275173A true CN1275173A (en) | 2000-11-29 |
| CN1091161C CN1091161C (en) | 2002-09-18 |
Family
ID=19548765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99801438A Expired - Fee Related CN1091161C (en) | 1998-08-28 | 1999-08-24 | Method for manufacturing high adherence enamel-coating steel sheet with superior formability |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3366904B2 (en) |
| KR (1) | KR100360095B1 (en) |
| CN (1) | CN1091161C (en) |
| ID (1) | ID25493A (en) |
| WO (1) | WO2000012773A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102884213A (en) * | 2010-05-11 | 2013-01-16 | 杰富意钢铁株式会社 | Cold-rolled steel sheet and method for producing same |
| CN104561832A (en) * | 2013-10-29 | 2015-04-29 | Posco公司 | Porcelain anamel steel sheet having no surface defects and excellent formability and manufacturing method thereof |
| CN108431268A (en) * | 2015-12-23 | 2018-08-21 | Posco公司 | Ductility, hole machined and excellent high strength cold rolled steel plate, hot-dip galvanized steel sheet and its manufacturing method of surface treatment characteristics |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100470669B1 (en) * | 2000-08-25 | 2005-03-07 | 주식회사 포스코 | A method for manufacturing high strength cold-rolled enamel steel sheet with superior fishscale resistance |
| JP2002343531A (en) * | 2001-05-18 | 2002-11-29 | Denso Corp | Terminal molded part and its manufacturing method |
| KR100951256B1 (en) | 2002-12-27 | 2010-04-02 | 주식회사 포스코 | Method of manufacturing hot rolled steel sheet for porcelain enameling |
| KR20100021274A (en) * | 2008-08-14 | 2010-02-24 | 주식회사 포스코 | Enameling steel sheet and manufacturing method thereof |
| CN104250705B (en) * | 2014-09-19 | 2017-01-18 | 宝山钢铁股份有限公司 | Enamel steel with high-temperature baking hardenability and manufacturing method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS543447B2 (en) * | 1973-03-09 | 1979-02-23 | ||
| JPS61117246A (en) * | 1984-11-13 | 1986-06-04 | Nippon Kokan Kk <Nkk> | Hot rolled steel sheet for enamel having high strength after baking and superior fish scale resistance and manufacture thereof |
| JPH02277719A (en) * | 1989-04-20 | 1990-11-14 | Nippon Steel Corp | Production of cold rolled steel sheet for rorcelain enameling excellent in fishscale resistance |
| JP2505579B2 (en) * | 1989-06-02 | 1996-06-12 | 新日本製鐵株式会社 | Manufacturing method of cold-rolled steel sheet for hollows having excellent resistance to tabs and its uniformity in the coil |
| KR970011629B1 (en) * | 1994-12-20 | 1997-07-12 | 김만제 | Method of manufacturing cold rolling sheet |
| JP3384265B2 (en) * | 1996-12-10 | 2003-03-10 | 日本鋼管株式会社 | Manufacturing method of cold rolled steel sheet for enamel with excellent nail jump resistance |
-
1998
- 1998-08-28 KR KR19980035267A patent/KR100360095B1/en not_active IP Right Cessation
-
1999
- 1999-08-24 CN CN99801438A patent/CN1091161C/en not_active Expired - Fee Related
- 1999-08-24 ID IDW20001024A patent/ID25493A/en unknown
- 1999-08-24 JP JP2000567755A patent/JP3366904B2/en not_active Expired - Fee Related
- 1999-08-24 WO PCT/KR1999/000477 patent/WO2000012773A1/en active Application Filing
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102884213A (en) * | 2010-05-11 | 2013-01-16 | 杰富意钢铁株式会社 | Cold-rolled steel sheet and method for producing same |
| CN102884213B (en) * | 2010-05-11 | 2014-10-08 | 杰富意钢铁株式会社 | Cold-rolled steel sheet and method for producing same |
| CN104561832A (en) * | 2013-10-29 | 2015-04-29 | Posco公司 | Porcelain anamel steel sheet having no surface defects and excellent formability and manufacturing method thereof |
| CN108431268A (en) * | 2015-12-23 | 2018-08-21 | Posco公司 | Ductility, hole machined and excellent high strength cold rolled steel plate, hot-dip galvanized steel sheet and its manufacturing method of surface treatment characteristics |
| CN108431268B (en) * | 2015-12-23 | 2020-12-18 | Posco公司 | High-strength cold-rolled steel sheet and hot-dip galvanized steel sheet having excellent ductility, hole workability, and surface treatment properties, and method for producing same |
| US11091818B2 (en) | 2015-12-23 | 2021-08-17 | Posco | High strength cold-rolled steel sheet and hot-dip galvanized steel sheet having excellent hole expansion, ductility and surface treatment properties, and method for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000012773A1 (en) | 2000-03-09 |
| KR20000015390A (en) | 2000-03-15 |
| CN1091161C (en) | 2002-09-18 |
| KR100360095B1 (en) | 2003-10-22 |
| ID25493A (en) | 2000-10-05 |
| JP3366904B2 (en) | 2003-01-14 |
| JP2002523633A (en) | 2002-07-30 |
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