WO2010137598A1 - 成形性に優れた熱延鋼板およびその製造方法 - Google Patents
成形性に優れた熱延鋼板およびその製造方法 Download PDFInfo
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- WO2010137598A1 WO2010137598A1 PCT/JP2010/058847 JP2010058847W WO2010137598A1 WO 2010137598 A1 WO2010137598 A1 WO 2010137598A1 JP 2010058847 W JP2010058847 W JP 2010058847W WO 2010137598 A1 WO2010137598 A1 WO 2010137598A1
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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
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- 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
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- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
-
- 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
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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
- C22C38/02—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
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Definitions
- the present invention relates to a hot-rolled steel sheet applied to materials such as automobiles and home appliances.
- the hot-rolled steel sheet has workability suitable for press molding and has excellent aging resistance and in-plane anisotropy. About.
- Hot-rolled steel sheets used in automobiles and electrical products are required to have high formability.
- hot-rolled steel sheets used for deep drawing applications such as compressor covers are energetically advanced. It has been.
- the stability of materials, especially aging resistance is becoming more important.
- the upper limit of strengthening elements such as C and Mn is limited to ensure soft high ductility, and 0.001% or more of B is added to fix N in the steel.
- a technique for improving the aging resistance is proposed in Patent Document 1.
- the amount of B added to the hot-rolled steel sheet is as high as 0.001% or more, so that
- Patent Document 2 proposes a technique for improving
- Patent Document 3 discloses a technique of performing finish rolling at three or more points of Ar in order to improve
- Non-Patent Document 1 the hot-rolled steel sheet to which B is added tends to be coarse and has a large dependency on the hot-rolling conditions. Therefore, if the finish rolling is simply performed at a high temperature as proposed in Patent Document 2 and Patent Document 3, excessive graining occurs, and the surface after press molding becomes rough.
- the hot-rolled steel sheet proposed in Patent Document 3 does not add B, but the grain growth property is enhanced by setting it to an extremely low P (0.005% or less), so the hot-rolled steel sheet proposed in Patent Document 2 As with, the occurrence of rough skin due to excessive coarsening becomes a problem.
- Patent Document 4 discloses a technique of adding Ti or Nb to a hot-rolled steel sheet for the purpose of suppressing excessive grain growth.
- Ti and Nb have remarkably strong recrystallization suppressing effects and grain growth suppressing effects. Therefore, in order to improve
- B since B is not added, the occurrence of aging in the low C region cannot be avoided, and there is a problem that the aging resistance is inferior.
- the present inventors conducted extensive research on the recrystallization behavior and the grain growth behavior of B-added aluminum killed steel.
- P is added in a relatively large amount, and in terms of process After hot rolling is completed, a short-time cooling treatment is performed on hot-rolled steel sheets with aging resistance and soft high ductility without causing excessive coarsening that causes skin roughness.
- ⁇ r can be reduced.
- the present invention has been made based on the above findings, and the gist thereof is as follows. (1) In mass%, C: 0.03% to 0.07%, Si: 0.1% or less, Mn: 0.05% or more and 0.5% or less, P: 0.01% or more and 0.03% or less, S: 0.03% or less, sol. Al: 0.02% or more and 0.1% or less, N: 0.005% or less, Nb + Ti: less than 0.005% and B: 0.0003% or more and 0.0020% or less, the balance being Fe and inevitable impurities, the average crystal grain size being 12 ⁇ m or more and 25 ⁇ m or less, and
- the hot rolled steel sheet can be provided with sufficient aging resistance and soft high ductility, and the in-plane anisotropy can be reduced while maintaining a crystal grain size suitable for press working. Therefore, according to the hot-rolled steel sheet of the present invention, even a product that requires high processing, such as a compressor cover, which has been difficult to form with conventional hot-rolled steel sheets, is produced without causing quality deterioration due to rough skin during forming. It becomes possible to do.
- the unit of the element content in the steel sheet is “mass%”, but hereinafter, it is simply indicated by “%” unless otherwise specified.
- Component composition range C 0.03% or more and 0.07% or less If the C content is large, a large amount of carbide is generated, the elongation of the hot-rolled steel sheet is reduced and formability is inhibited, so the content thereof Is 0.07% or less. On the other hand, since extremely low C leads to an increase in manufacturing cost, the lower limit is made 0.03%.
- Si 0.1% or less Since Si increases in strength and deteriorates moldability when contained in excess, its content is made 0.1% or less.
- Si is an element that deteriorates moldability, and its content is preferably low.
- Mn 0.05% or more and 0.5% or less Since Mn has an effect of fixing S as MnS and improving hot ductility, its content needs to be 0.05% or more. On the other hand, excessive addition causes hardening of the steel and deteriorates formability, so the upper limit of the content is set to 0.5%.
- P 0.01% or more and 0.03% or less
- P is a characteristic element in the present invention. That is, when the P content is low, the grain growth increases and the risk of rough skin due to coarsening increases. Therefore, in the present invention, at least 0.01% of P is contained. Nonetheless, P is a solid solution strengthening element. If it is excessively contained, the steel is hardened, so the upper limit is made 0.03%.
- S 0.03% or less S is an element that inhibits hot ductility and formability, and the content is preferably low.
- S is fixed as MnS for the purpose of improving hot ductility and formability. However, if the amount of MnS is excessive, the elongation is reduced, so the upper limit of the S content is 0.03%.
- sol. Al 0.02% or more and 0.1% or less Al is not only useful as a deoxidizing agent, but also fixes N which is not fixed by B as AlN to enhance aging resistance. sol.
- the Al content needs to be 0.02% or more. On the other hand, excessive addition causes an increase in manufacturing cost, so the upper limit is made 0.1%.
- N 0.005% or less
- N is an element that causes aging of a hot-rolled steel sheet, and its content is preferably as small as possible. However, excessive reduction causes a significant cost increase.
- B and Al are added to fix N, if the N content is 0.005% or less, the adverse effect can be ignored, so the upper limit is made 0.005%.
- Nb + Ti less than 0.005% Since Nb and Ti are strong recrystallization suppressing elements, it is difficult to reduce
- B 0.0003% or more and 0.0020% or less B is an element that fixes N and improves aging resistance. Moreover, since it has the effect
- the balance other than the components described above is Fe and inevitable impurities. As impurities, for example, Cu: 0.02% or less and Ni: 0.02% or less are allowed.
- the average crystal grain size must be 12 ⁇ m or more and 25 ⁇ m or less. If it is less than 12 ⁇ m, the yield strength becomes high and molding becomes difficult, and if it exceeds 25 ⁇ m, rough skin occurs during press molding. In addition, More preferably, they are 12 micrometers or more and 23 micrometers or less.
- the aging index AI refers to the difference in tensile stress before and after aging treatment at 100 ° C. for 30 minutes after a tensile elongation of 7.5%. Since the yield elongation phenomenon may occur after the aging treatment, strictly speaking, the yield stress or 0.2% proof stress after the aging treatment is used. If the aging index AI exceeds 20 MPa, the material changes during transportation or during coil storage, and it is necessary to optimize the press molding conditions, leading to an increase in product cost. On the other hand, if AI is 20 MPa or less, the material variation is not a problem, and therefore AI is 20 MPa or less, more preferably 10 MPa or less.
- Manufacturing process A steel piece obtained by casting the steel prepared by melting in the above component composition range is cast immediately or after reheating, and the final pass of the hot rolling is set to rolling temperature: Ar 3 points + 50 C. or higher and rolling rate: 15% or more. After the hot rolling, the mixture is allowed to cool for 0.5 seconds to 10 seconds and then cooled to 700.degree. C. or lower at a cooling rate of 20.degree. C./s or higher. And wound up at 590 ° C. or more and 700 ° C. or less.
- the reheating temperature need not be specified, but it must be reheated under conditions that can secure the finish rolling temperature, and is generally 1050 to 1300 ° C.
- the finish rolling temperature and rolling rate, and cooling after finish rolling are performed. It is important to optimize the conditions and the winding temperature.
- the present inventors investigated the correlation between
- the final pass of the hot rolling means the final pass in the finish rolling of the hot rolling, that is, the final reduction stand, and the rolling temperature (also referred to as the finish rolling temperature) is the outlet temperature of the reduction stand.
- the r 45 value in the above equation (1) shows a large value relative to the r 0 value and the r 90 value.
- the r 0 value and the r 90 value increase as the rolling temperature of the steel increases, while the r 45 value decreases.
- in the above equation (1) decreases, and this
- finish rolling is performed at a high temperature where the final pass is a rolling temperature: Ar 3 points + 50 ° C. or more.
- the finish rolling temperature is preferably 950 ° C. or less from the viewpoint of reducing the scale layer.
- it cools for a predetermined time after finish rolling. This is because the austenite processed structure formed by finish rolling is recrystallized in the austenite region, the texture is randomized, and
- the cooling after finish rolling is less than 0.5 seconds, recrystallization of the austenite processed structure is not sufficient, so in the present invention, the cooling time is set to 0.5 seconds or more.
- the final pass rolling rate (reduction rate in the final pass) is 15% or more, more preferably 20% or more to increase the number of recrystallized nuclei, and the cooling time after finish rolling is 10 times.
- the size of the crystal grains after ferrite transformation was adjusted to an appropriate range by suppressing the austenite grain growth for less than 2 seconds, preferably less than 5 seconds.
- the said rolling rate shall be less than 25% at the point which makes a steel plate shape favorable.
- the sample After a predetermined holding (cooling) time has elapsed, the sample is cooled to 700 ° C. or lower at a cooling rate of 20 ° C./sec or higher, and wound at 590 ° C. or higher and 700 ° C. or lower.
- the cooling rate In order to suppress grain growth during cooling, the cooling rate needs to be 20 ° C./sec or more.
- the winding temperature is set to 590 ° C. or more and 700 ° C. or less. Preferably it is 625 degreeC or more.
- the upper limit of the cooling rate is approximately 500 ° C./s from the viewpoint of not accompanied by a large increase in manufacturing cost.
- the performance of the hot-rolled steel sheet according to the present invention is the same regardless of whether it is pickled or black leather. Moreover, there is no problem even if hot dip galvanization is performed with the black skin material after pickling or without pickling. Although there is no restriction
- the hot-rolled steel sheet targeted by the present invention is a soft hot-rolled steel sheet suitably used for deep drawing applications with a yield stress of about 250 MPa or less and a plate thickness of about 2 mm to 6 mm.
- Example 1 Steel having the components shown in Table 1 was melted, and a processed Formaster test piece having a diameter of 8 mm and a height of 12 mm was cut out, heated to 1200 ° C., cooled to 950 ° C. at a cooling rate of 10 ° C./second, and at 950 ° C. After compressing at 30% strain, it was cooled to 200 ° C. at a cooling rate of 10 ° C./second. When the thermal expansion curve during cooling was measured Ar 3 point was 823 ° C.. This steel was heated to 1200 ° C. and hot-rolled under the conditions shown in Table 2 to obtain a hot-rolled steel plate having a thickness of 3.2 mm.
- the obtained hot-rolled steel sheet was pickled and then subjected to temper rolling with an elongation of 1%, and mechanical property evaluation and structure observation were performed.
- JIS Z 2201 (1998) No. 5 test piece was sampled in the rolling direction (RD) and subjected to a tensile test based on JIS Z 2241 (1998).
- the r value was measured by collecting No. 5 test piece of JIS Z 2201 (1998) in the rolling direction (RD), the rolling perpendicular direction (TD), and the rolling 45 ° direction (DD) and applying 15% strain.
- was determined according to the equation (1).
- AI was obtained by collecting JIS Z 2201 (1998) No. 5 test piece in the rolling direction (RD), applying a pre-strain of 7.5%, and performing heat treatment at 100 ° C. for 30 minutes to obtain stress (7.
- the stress was evaluated by the difference between the stress at the time of applying 5% pre-strain and the yield stress after the heat treatment.
- the yield stress YP is 220 MPa or less
- the breaking elongation El is 48% or more and soft and highly ductile
- AI is 20 MPa or less
- is 0.25.
- a hot rolled steel sheet having the following and sufficient aging resistance and low anisotropy is obtained.
- the average crystal grain size of the hot-rolled steel sheet produced under the conditions B, C, G, and H of the examples of the present invention satisfies the range of 12 to 25 ⁇ m, and therefore there is no risk of rough skin during press forming.
- conditions B, C, and H, which are examples of the present invention have a coiling temperature of 625 ° C. or higher, and thus the AI of the obtained hot-rolled steel sheet is 10 MPa or less, and is particularly excellent in aging resistance. .
- Example 2 Steel having the components shown in Table 3 was melted, and Ar 3 points were measured by the same method as in Example 1. Next, after these steels were heated to 1200 ° C., the final pass of finish rolling in hot rolling was performed at a rolling rate of 22% and a temperature of 875 ° C., allowed to cool for 4.2 seconds after finish rolling, and then 25 ° C./second. It cooled to 630 degreeC with the cooling rate of and wound up as it was.
- the yield stress YP is 220 MPa or less
- the breaking elongation El is 48% or more, which is soft and highly ductile
- AI is 20 MPa or less
- the average grain size of the hot rolled steel sheet of steel No. 3 is 20 ⁇ m or less, there is less concern about rough skin.
- P is added in the range of 0.01 to 0.03% to the hot-rolled steel sheet for processing to which B is added, and the rolling rate is 15% or more, and after the final pass, 0.5 to 10 seconds.
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Abstract
Description
(1)質量%で、
C:0.03%以上0.07%以下、
Si:0.1%以下、
Mn:0.05%以上0.5%以下、
P:0.01%以上0.03%以下、
S:0.03%以下、
sol.Al:0.02%以上0.1%以下、
N:0.005%以下、
Nb+Ti:0.005%未満 および
B:0.0003%以上0.0020%以下
を含有し、残部がFe及び不可避的不純物からなり、平均結晶粒径が12μm以上25μm以下で、かつ、|Δr|≦0.25、AI≦20MPaであることを特徴とする、熱延鋼板。
C:0.03%以上0.07%以下、
Si:0.1%以下、
Mn:0.05%以上0.5%以下、
P:0.01%以上0.03%以下、
S:0.03%以下、
sol.Al:0.02%以上0.1%以下、
N:0.005%以下、
Nb+Ti:0.005%未満 および
B:0.0003%以上0.0020%以下
を含有し、残部がFe及び不可避的不純物からなる鋼片に、熱間圧延の最終パスを圧延温度:Ar3点+50℃以上かつ圧延率:15%以上の条件で行い、該熱間圧延終了後、0.5秒以上10秒以下の時間放冷した後、20℃/s以上の冷却速度で700℃以下まで冷却し、590℃以上700℃以下で巻き取ることを特徴とする、熱延鋼板の製造方法。
(1)成分組成範囲
C:0.03%以上0.07%以下
C含有量が多いと炭化物を多量に生成し、熱延鋼板の伸びを低下させ成形性を阻害することから、その含有量を0.07%以下とする。一方、極端な低C化は製造コストの増加を招くため、その下限を0.03%とする。
Siは、過剰に含有すると強度が高まり成形性を劣化させることから、その含有量は0.1%以下とする。本発明においてSiは、成形性を劣化させる元素であり、その含有量は低いほうが好ましい。
Mnは、SをMnSとして固定し、熱間延性を向上させる作用があることから、その含有量は0.05%以上とする必要がある。一方、過剰な添加は鋼の硬質化をもたらすとともに、成形性を劣化させることから、含有量の上限を0.5%とする。
Pは、本発明において特徴的な元素である。すなわち、P含有量が少ないと粒成長が高まり、粗粒化による肌荒れを招来するおそれが増大する。そこで本発明では少なくとも0.01%のPを含有させるものとした。とはいえ、Pは固溶強化元素であり、過剰に含有させると鋼の硬質化をもたらすため上限を0.03%とする。
Sは、熱間延性や成形性を阻害する元素であり、その含有量は低いほうが好ましい。また、熱間延性や成形性を改善する目的でSはMnSとして固定されるが、MnS量が過剰になると伸びの低下を招くため、Sの含有量の上限は0.03%とする。
Alは、脱酸剤として有用なだけでなく、Bで固定されないNをAlNとして固定して耐時効性を高める。sol.Alの含有量としては0.02%以上が必要である。一方、過度の添加は製造コストの上昇を招くため、その上限を0.1%とする。
Nは、熱延鋼板の時効の原因となる元素であり、その含有量は少ないほど好ましいが、過度の低減は著しいコスト上昇を招く。本発明においては、BおよびAlを添加してNを固定するため、N含有量が0.005%以下であれば、その弊害が無視できることから上限を0.005%とする。
Nb、Tiは、強力な再結晶抑制元素であるため、これらの元素を過度に含有すると|Δr|の低減化が困難になる。また、これらの元素は強力な粒成長抑制元素でもあるため、過度に含有すると熱延鋼板の結晶粒が細粒となり、伸びの低下を招く。この点、Nb+Ti量は少ない程好ましいが、NbとTiの含有量が合わせて0.005%未満であれば、上記弊害が無視できることからNb+Tiの上限を0.005%未満とする。
Bは、Nを固定して耐時効性を向上させる元素である。また、結晶粒を適度に粗粒化する作用を有し、結晶粒微細化に起因する伸びの低下を抑制する効果を奏することから、Bの含有量としては0.0003%以上を必要とする。一方、過度に添加すると|Δr|が大きくなるため、その上限を0.0020%とする。
なお、上記した成分以外の残部はFeおよび不可避的不純物である。不純物としては、例えばCu:0.02%以下、Ni:0.02%以下程度が許容される。
平均結晶粒径は、12μm以上25μm以下とすることが必要である。12μm未満では降伏強度が高くなって成形が困難になり、25μmを超えるとプレス成形時に肌荒れが生じるためである。なお、より好ましくは12μm以上23μm以下である。
下記(1)式で示される平均r値の異方差|Δr|が0.25を超えると、絞り成形時の歩留まりが低下するため、0.25以下とする必要がある。
記
|Δr|=|(r0+r90−2r45)/2| (1)式
ここで、r0は、圧延方向(RD)の、r90は、圧延直角方向(TDの)、r45は、圧延45°方向(DD)のr値を示す。なお、平均r値は0.80以上とすることが成形荷重低減の点で好ましい。また、本発明の鋼板は熱延鋼板であり、平均r値は概ね1.0以下である。
エイジングインデックスAIとは、伸び率7.5%の引張後、100℃で30分の時効処理の前後における引張応力差をいう。なお、時効処理後は、降伏伸び現象が生じる場合があるので、厳密には、時効処理後の下降伏応力または0.2%耐力を用いる。エイジングインデックスAIが20MPaを超えると、輸送途中やコイル保管期間中に材質が変動し、プレス成形条件の適正化を図ることが必要となるため、製品コストの上昇を招く。これに対し、AIが20MPa以下であれば、材質変動が問題とならない範囲であるため、AIは20MPa以下、より好ましくは10MPa以下とする。
上記の成分組成範囲に溶製調整した鋼を、鋳造して得られた鋼片に、鋳造直後または再加熱した後、熱間圧延の最終パスを圧延温度:Ar3点+50℃以上かつ圧延率:15%以上の条件で行い、該熱間圧延終了後、0.5秒以上10秒以下の時間放冷した後、20℃/s以上の冷却速度で700℃以下まで冷却し、590℃以上700℃以下で巻き取る。なお、上記再加熱温度は特に規定する必要はないが、仕上げ圧延温度を確保できる条件で再加熱する必要があり、一般には1050~1300℃である。
なお、上記圧延率は、25%未満とすることが、鋼板形状を良好にする点で好ましい。
表1に示す成分を有する鋼を溶製し、φ8mm、高さ12mmの加工フォーマスタ試験片を切り出し、1200℃に加熱後、10℃/秒の冷却速度で950℃まで冷却し、950℃で30%の歪みで圧縮した後、10℃/秒の冷却速度で200℃まで冷却した。冷却時の熱膨張曲線からAr3点を測定したところ、823℃であった。この鋼を1200℃に加熱後、表2に示す条件で熱間圧延を行い、板厚3.2mmの熱延鋼板とした。
表3に示す成分を有する鋼を溶製し、実施例1と同様の方法によりAr3点を測定した。次いで、これらの鋼を1200℃に加熱後、熱間圧延における仕上げ圧延の最終パスを、圧延率22%、温度875℃で行い、仕上げ圧延後4.2秒放冷した後、25℃/秒の冷却速度で630℃まで冷却し、そのまま巻き取った。
Claims (2)
- 質量%で、
C:0.03%以上0.07%以下、
Si:0.1%以下、
Mn:0.05%以上0.5%以下、
P:0.01%以上0.03%以下、
S:0.03%以下、
sol.Al:0.02%以上0.1%以下、
N:0.005%以下、
Nb+Ti:0.005%未満 および
B:0.0003%以上0.0020%以下
を含有し、残部がFe及び不可避的不純物からなり、平均結晶粒径が12μm以上25μm以下で、かつ、|Δr|≦0.25、AI≦20MPaであることを特徴とする、熱延鋼板。 - 質量%で、
C:0.03%以上0.07%以下、
Si:0.1%以下、
Mn:0.05%以上0.5%以下、
P:0.01%以上0.03%以下、
S:0.03%以下、
sol.Al:0.02%以上0.1%以下、
N:0.005%以下、
Nb+Ti:0.005%未満 および
B:0.0003%以上0.0020%以下
を含有し、残部がFe及び不可避的不純物からなる鋼片に、熱間圧延の最終パスを圧延温度:Ar3点+50℃以上かつ圧延率:15%以上の条件で行い、該熱間圧延終了後、0.5秒以上10秒以下の時間放冷した後、20℃/s以上の冷却速度で700℃以下まで冷却し、590℃以上700℃以下で巻き取ることを特徴とする、熱延鋼板の製造方法。
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SG2013054267A SG194424A1 (en) | 2009-05-25 | 2010-05-19 | Hot rolled sheet steel having excellent formability, and method for producing same |
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JPH10183255A (ja) * | 1996-12-20 | 1998-07-14 | Nippon Steel Corp | r値の面内異方性の小さい熱延鋼板の製造方法 |
JPH10219388A (ja) * | 1997-02-05 | 1998-08-18 | Nkk Corp | 加工性に優れ、かつ加工性の幅方向での変動が少ない鋼板およびその製造方法 |
JPH1161270A (ja) * | 1997-08-26 | 1999-03-05 | Nkk Corp | 塑性異方性が小さく、加工性に優れた熱延鋼板の製造方法 |
JPH11222647A (ja) * | 1998-01-31 | 1999-08-17 | Kawasaki Steel Corp | 耐時効性に優れかつ耳発生率の小さい表面処理鋼板用原板およびその製造方法 |
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WO2001062997A1 (fr) * | 2000-02-23 | 2001-08-30 | Kawasaki Steel Corporation | Feuille d'acier resistant a une traction elevee, laminee a chaud et dotee d'excellentes proprietes de resistance au durcissement, au vieillissement et a la deformation et procede de fabrication associe |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH10183255A (ja) * | 1996-12-20 | 1998-07-14 | Nippon Steel Corp | r値の面内異方性の小さい熱延鋼板の製造方法 |
JPH10219388A (ja) * | 1997-02-05 | 1998-08-18 | Nkk Corp | 加工性に優れ、かつ加工性の幅方向での変動が少ない鋼板およびその製造方法 |
JPH1161270A (ja) * | 1997-08-26 | 1999-03-05 | Nkk Corp | 塑性異方性が小さく、加工性に優れた熱延鋼板の製造方法 |
JPH11222647A (ja) * | 1998-01-31 | 1999-08-17 | Kawasaki Steel Corp | 耐時効性に優れかつ耳発生率の小さい表面処理鋼板用原板およびその製造方法 |
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CN102449178A (zh) | 2012-05-09 |
MY153088A (en) | 2014-12-31 |
CN102449178B (zh) | 2014-12-10 |
KR101369098B1 (ko) | 2014-02-28 |
JP2010270383A (ja) | 2010-12-02 |
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