WO2006109814A1 - 鋼材の水冷方法およびその水冷方法により得られた鋼材 - Google Patents
鋼材の水冷方法およびその水冷方法により得られた鋼材 Download PDFInfo
- Publication number
- WO2006109814A1 WO2006109814A1 PCT/JP2006/307686 JP2006307686W WO2006109814A1 WO 2006109814 A1 WO2006109814 A1 WO 2006109814A1 JP 2006307686 W JP2006307686 W JP 2006307686W WO 2006109814 A1 WO2006109814 A1 WO 2006109814A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- cooling
- oxide film
- thickness
- steel material
- Prior art date
Links
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
Definitions
- the present invention relates to a water cooling method for controlling the thickness of an oxide film of a heated steel material, and a steel material obtained by the water cooling method.
- the annealed steel material is subjected to chemical conversion treatment and tacking on the surface. In this case, if an oxide film is formed on the surface, the chemical conversion treatment and staking will not be sufficient, and the subsequent paintability, plating adhesion and corrosion resistance will be impaired. Therefore, the annealed steel must be cooled without oxidation.
- the cooling medium If water is used as the cooling medium, the oxidation of the steel cannot be avoided because the water itself is oxidizing. However, if the steel material is thick or a relatively fast cooling rate is required, the cooling rate using gas cannot provide the required cooling rate, and cooling using water is required. In this case, post-treatment such as pickling is required after annealing to remove the oxide film formed on the steel surface.
- JP-A-57-198218 discloses a method for cooling by reducing the dissolved oxygen concentration in cooling water to less than or equal to 0.1 ppm, and JP-A-61-179820.
- the publication proposes a cooling facility equipped with a deaeration facility. Oxidation of steel during water cooling includes oxidation that proceeds using dissolved oxygen as an oxygen source and oxidation by the cooling water itself. Without understanding these contributions, they simply propose to reduce dissolved oxygen.
- JP-A-63-7339 an electrochemical method is proposed to reduce oxidation by water in consideration of the presence of oxidation by dissolved oxygen and water.
- the prior art distinguishes between the thickness of the oxide film due to dissolved oxygen in water and the thickness of the oxide film due to water vapor (that is, the cooling water itself) generated in contact with the heated steel material. None of the factors that affect the thickness were identified, and the relationship between the thickness of each oxide film and the factors affecting it was not quantified. Disclosure of the invention
- cooling of thick steel or cooling that requires a relatively fast cooling rate requires cooling using water, but cooling using water requires an acid to remove the oxide film that forms on the surface of the steel. Post-treatment such as washing is required.
- the present invention provides a water-cooling method for steel that does not require post-treatment to remove the oxide film after water-cooling, and a steel material obtained by the water-cooling method.
- the present inventors have accurately determined the contribution of oxidation by oxygen and oxidation by water vapor.
- the present invention is characterized in that, in a water cooling method for water-cooling a heated steel material, the thickness of an oxide film formed on the steel material surface is controlled by the following equation.
- Thickness of the oxide film generated using water vapor as the oxidation source (nm) d devis 20 ⁇ 5. 50X 10— 3 (T — T. 2 ) — 6.51 ( ⁇ ( - ⁇ 0 ) ⁇ / C R , ⁇ . ⁇ 573 ⁇
- Thickness (nm) of the oxide film generated using dissolved oxygen as the oxidation source. 2 7.98X 10— 4 (L— T n ) dD 0 where T. ⁇ 573K
- the water cooling method of the present invention includes a water cooling start temperature (Ti), a water cooling end point temperature (T.), a steel thickness (d), a dissolved oxygen concentration (D.) in the cooling water, and a cooling rate (C R ).
- a water cooling start temperature Ti
- a water cooling end point temperature T.
- a steel thickness d
- a dissolved oxygen concentration D.
- C R cooling rate
- the water cooling method of the present invention is characterized in that the heated steel material is water cooled using cooling water in which dissolved oxygen is reduced by a deaeration device.
- the steel material of the present invention is a steel material obtained by the water cooling method of the present invention, wherein the steel film has an oxide film thickness of 15 nm or less, and the water cooling method of the steel material of the present invention, and According to the steel material obtained by this water cooling method, the following effects can be obtained.
- the thickness of the oxide film generated by using dissolved oxygen in the cooling water as an oxidation source is obtained as a function of the water cooling start temperature, the water cooling end point temperature, the steel thickness, and the dissolved oxygen concentration in the cooling water, and the cooling water evaporates.
- the thickness of the oxide film generated by using water vapor as an oxidation source is determined as a function of the water cooling start temperature, the water cooling end temperature, and the cooling rate. It is possible to quantitatively set various conditions for this.
- FIG. 1 is a graph showing the relationship between the cooling rate and the oxide film thickness in the water cooling method of the present invention.
- the present inventors have investigated in detail the oxidation phenomenon caused by water containing dissolved oxygen.
- the oxidation phenomenon caused by water includes oxidation using dissolved oxygen as the oxygen source and oxidation using water vapor as the oxygen source.
- the present inventors have succeeded in quantitatively determining the oxidation rate with each as an oxidation source, and the sum of the thicknesses of the oxide films with each as an oxidation source is an oxide film generated during water cooling. It was found that the thickness becomes. While the heated steel is water cooled, the steel is always oxidized by water vapor.
- the present inventors quantitatively determined the water vapor oxidation rate by accurately measuring the steam oxidation of the steel material.
- the oxidation rate does not depend on the oxide film thickness, (ii) the oxidation rate is proportional to the water vapor rate, and (iii) the oxidation rate is an index with respect to temperature. It turned out to increase functionally.
- the oxide film thickness on the steel material surface when the water cooling start temperature and the cooling rate during steel water cooling are changed can be obtained by the following formula.
- the water vapor partial pressure is 1 atm.
- the thickness of the oxide film generated by the amount of water evaporation is determined by the following equation.
- the sum of the thickness of the oxide film generated by water and the thickness of the oxide film generated by dissolved oxygen is the thickness of the oxide film generated by water cooling.
- the inventors prepared a steel material with an oxide film by cooling with water during annealing, and confirmed the appearance.
- the steel material after water cooling was able to confirm the color corresponding to the oxide film thickness.
- the oxide film thickness is 15 nm or less
- the temper color hardly occurs and the metallic luster is obtained.
- the oxide film exceeds 15 nm a light yellow temper color is generated.
- the temper color becomes darker, and when it exceeds 30 nm, a brown temper color is obtained.
- steel materials with an oxide film formed by cooling with water during annealing were prepared, subjected to chemical conversion treatment, and the following three evaluations were performed.
- Table 1 shows the results of chemical conversion treatment and adhesion evaluation. If the thickness of the oxide film is 15 nm or less, there will be no problems with chemical conversion and adhesion. When the oxide film thickness is 15 to 30 nm, no problem occurs in the micro-observation of the chemical conversion treatment, the amount of adhesion, and the adhesiveness in adhesion, but color unevenness occurs in the chemical conversion treatment. If the oxide film thickness is 30 nm or more, problems will occur in all evaluations of chemical conversion treatment and adhesive adhesion.
- the adjustable conditions may be adjusted as appropriate.
- the dissolved oxygen concentration in the cooling water can be adjusted by using a cooling facility with a deaerator.
- FIG. 1 is a graph showing the relationship between the cooling rate and the oxide film thickness by the water cooling method of the present invention.
- Table 2 shows the steel thickness (d), cooling start temperature (1), cooling end point temperature (T.), and dissolved oxygen concentration (D.) conditions used in the examples.
- the oxide film thickness can be determined by setting the water cooling start temperature, the water cooling end point temperature, the steel material thickness, the dissolved oxygen concentration in the cooling water, and the cooling rate condition. Therefore, to obtain the required oxide film thickness after water cooling, it is possible to quantitatively grasp the range in which various operating conditions are set.
- the present invention it is possible to quantitatively set various conditions for obtaining a required oxide film thickness on the surface of a steel material after water cooling, and to clearly set a target value of the oxide film thickness after water cooling. Therefore, the present invention has great applicability in the steel material manufacturing industry.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Physical Vapour Deposition (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/918,290 US7815757B2 (en) | 2005-04-12 | 2006-04-05 | Water-cooling method of steel material |
BRPI0610554-8B1A BRPI0610554B1 (pt) | 2005-04-12 | 2006-04-05 | Método de resfriamento a água para resfriar um material de aço aquecido |
EP06731633A EP1873264B1 (en) | 2005-04-12 | 2006-04-05 | Method for cooling steel product with water |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-115049 | 2005-04-12 | ||
JP2005115049 | 2005-04-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006109814A1 true WO2006109814A1 (ja) | 2006-10-19 |
Family
ID=37087084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/307686 WO2006109814A1 (ja) | 2005-04-12 | 2006-04-05 | 鋼材の水冷方法およびその水冷方法により得られた鋼材 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7815757B2 (ja) |
EP (1) | EP1873264B1 (ja) |
KR (1) | KR100995393B1 (ja) |
CN (2) | CN101171347A (ja) |
BR (1) | BRPI0610554B1 (ja) |
RU (1) | RU2366732C2 (ja) |
WO (1) | WO2006109814A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102269668B (zh) * | 2011-07-11 | 2013-01-02 | 南京钢铁股份有限公司 | 一种对压缩试样进行急速水淬的试验方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61179820A (ja) * | 1985-02-05 | 1986-08-12 | Nippon Steel Corp | 連続焼鈍設備 |
JPS637339A (ja) * | 1986-06-27 | 1988-01-13 | Nippon Kokan Kk <Nkk> | 鋼帯の冷却方法 |
JPS6311623A (ja) * | 1986-06-30 | 1988-01-19 | Kawasaki Steel Corp | 化成処理性の優れた鋼板の製造方法およびその連続焼鈍設備 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5173911A (en) * | 1974-12-24 | 1976-06-26 | Nippon Kokan Kk | Kosutoritsupuoteisankajotaidemizuyakiiresuruhoho oyobi sochi |
JPS5424211A (en) | 1977-07-26 | 1979-02-23 | Showa Electric Wire & Cable Co Ltd | Cooling method for annealed wire rod |
JPS57198218A (en) | 1981-05-29 | 1982-12-04 | Nippon Steel Corp | Cooling method for continuously annealed steel strip |
JPS6052531A (ja) * | 1983-09-02 | 1985-03-25 | Nippon Steel Corp | 冷延鋼帯の冷却用水溶液 |
BE1014417A3 (fr) * | 2001-10-05 | 2003-10-07 | Cockerill Rech & Dev | Procede de recuit continu pour l'obtention d'un etat de surface ameliore. |
-
2006
- 2006-04-05 CN CNA2006800156579A patent/CN101171347A/zh active Pending
- 2006-04-05 RU RU2007141708/02A patent/RU2366732C2/ru active
- 2006-04-05 WO PCT/JP2006/307686 patent/WO2006109814A1/ja active Search and Examination
- 2006-04-05 US US11/918,290 patent/US7815757B2/en not_active Expired - Fee Related
- 2006-04-05 BR BRPI0610554-8B1A patent/BRPI0610554B1/pt not_active IP Right Cessation
- 2006-04-05 KR KR1020077023347A patent/KR100995393B1/ko not_active IP Right Cessation
- 2006-04-05 EP EP06731633A patent/EP1873264B1/en not_active Expired - Fee Related
- 2006-04-05 CN CN2012103619071A patent/CN102851468A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61179820A (ja) * | 1985-02-05 | 1986-08-12 | Nippon Steel Corp | 連続焼鈍設備 |
JPS637339A (ja) * | 1986-06-27 | 1988-01-13 | Nippon Kokan Kk <Nkk> | 鋼帯の冷却方法 |
JPS6311623A (ja) * | 1986-06-30 | 1988-01-19 | Kawasaki Steel Corp | 化成処理性の優れた鋼板の製造方法およびその連続焼鈍設備 |
Also Published As
Publication number | Publication date |
---|---|
RU2007141708A (ru) | 2009-05-20 |
EP1873264A1 (en) | 2008-01-02 |
BRPI0610554B1 (pt) | 2014-05-27 |
EP1873264B1 (en) | 2012-10-24 |
CN101171347A (zh) | 2008-04-30 |
RU2366732C2 (ru) | 2009-09-10 |
KR20080010393A (ko) | 2008-01-30 |
EP1873264A4 (en) | 2011-05-25 |
CN102851468A (zh) | 2013-01-02 |
US20090038715A1 (en) | 2009-02-12 |
KR100995393B1 (ko) | 2010-11-19 |
BRPI0610554A2 (pt) | 2010-07-06 |
US7815757B2 (en) | 2010-10-19 |
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