JPH05186849A - High strength plated steel sheet - Google Patents
High strength plated steel sheetInfo
- Publication number
- JPH05186849A JPH05186849A JP316492A JP316492A JPH05186849A JP H05186849 A JPH05186849 A JP H05186849A JP 316492 A JP316492 A JP 316492A JP 316492 A JP316492 A JP 316492A JP H05186849 A JPH05186849 A JP H05186849A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- plating
- plated steel
- affected zone
- corrosion resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- Electroplating And Plating Baths Therefor (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高強度めっき鋼板に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high strength plated steel sheet.
【０００２】[0002]
【従来の技術】従来、自動車のフレーム、サスペンショ
ンなどの足まわり部品用の鋼板あるいは補強用の内板と
しては熱延鋼板および冷延鋼板が使用されていた。これ
らの部品を軽量化のために板厚を減少させようとして
も、溶接部の疲労強度が低いため、あるいは耐食性が不
十分なために、板厚の減少は困難であった。耐食性を確
保するために、たとえば特開昭６２−２４３７３８号，
特開昭６３−２５５３４１号公報などがある。2. Description of the Related Art Heretofore, hot-rolled steel sheets and cold-rolled steel sheets have been used as steel plates for suspension parts such as automobile frames and suspensions or as inner plates for reinforcement. Even if it is attempted to reduce the plate thickness of these parts in order to reduce the weight, it is difficult to reduce the plate thickness because the fatigue strength of the welded portion is low or the corrosion resistance is insufficient. In order to secure corrosion resistance, for example, JP-A-62-243738,
There is JP-A-63-255341.
【０００３】これらは、Ｃの含有量を減らし、ＣｕとＰ
を添加したことに特徴がある。耐食性確保のためには、
これらの対策は有効であるが、これらの鋼材ではいずれ
も溶接熱影響部の強度が低下し、この部分の疲労強度が
母材よりも劣るという欠点を有していた。この点から、
耐食性を向上させて板厚を減少させようとしても、おの
ずと限度が生じていた。また、耐食性も必ずしも十分と
はいえなかった。[0003] These reduce the content of C, Cu and P
It is characterized by the addition of. To ensure corrosion resistance,
Although these measures are effective, all of these steel materials have the drawback that the strength of the weld heat affected zone is reduced and the fatigue strength of this area is inferior to that of the base metal. From this point,
Even when trying to improve the corrosion resistance and reduce the plate thickness, the limit naturally occurred. Further, the corrosion resistance was not always sufficient.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記欠点を
解決し、溶接熱影響部の強度低下を抑え、かつ十分な耐
食性を具備させた高強度めっき鋼板を提供するものであ
る。SUMMARY OF THE INVENTION The present invention provides a high-strength plated steel sheet which solves the above-mentioned drawbacks, suppresses the decrease in strength of the weld heat-affected zone, and has sufficient corrosion resistance.
【０００５】[0005]
【課題を解決するための手段】本発明の特徴とするとこ
ろは、Ｃ：０．００５〜０．２０％、Ｓｉ：０．００５
〜１．０％、Ｍｎ：０．１〜２．５％、Ｐ：０．００１
〜０．１０％、Ｓ：０．００１〜０．０１０％、Ａｌ：
０．００５〜０．１％、Ｎ：０．０００５〜０．０１０
０％、Ｎｂ：０．０１〜０．０５％、Ｍｏ：０．１〜
０．５０％を含有し、残部Ｆｅおよび不可避的不純物か
らなる鋼板の表面に犠牲防食作用のあるめっきを施した
高強度めっき鋼板、ならびに該めっきが亜鉛である高強
度めっき鋼板、ならびに上述のめっき鋼板に伸び率にし
て１．０％以上１０．０％未満の歪が加えられている高
強度めっき鋼板にある。The features of the present invention are as follows: C: 0.005 to 0.20%, Si: 0.005
~ 1.0%, Mn: 0.1-2.5%, P: 0.001
~ 0.10%, S: 0.001-0.010%, Al:
0.005-0.1%, N: 0.0005-0.010
0%, Nb: 0.01 to 0.05%, Mo: 0.1
A high-strength plated steel sheet containing 0.50% and a balance of Fe and unavoidable impurities on the surface of which a plating having a sacrificial anticorrosion effect is applied, and a high-strength plated steel sheet in which the plating is zinc, and the above-mentioned plating. It is a high-strength plated steel sheet in which a strain of 1.0% or more and less than 10.0% is applied to the steel sheet in terms of elongation.
【０００６】自動車の腐食環境は、北米、欧州などが最
も厳しく、この地域では冬期に道路氷結防止剤（塩化ナ
トリウム、塩化カルシウムなど）が使用されるため、塩
素イオン存在下で湿潤・乾燥が繰り返される。このよう
な環境下では、特開昭６２−２４３７３８号公報に開示
されるように、ＣｕとＰの添加が効果的である。The corrosive environment of automobiles is the harshest in North America and Europe. In this region, road deicing agents (sodium chloride, calcium chloride, etc.) are used. Therefore, wet and dry are repeated in the presence of chloride ions. Be done. Under such an environment, addition of Cu and P is effective, as disclosed in JP-A-62-243738.
【０００７】しかしながら、この鋼の耐食性では不十分
であり、より高い防食性能が求められていた。この腐食
に対しては、亜鉛めっきが有効である。すなわち、自動
車の足まわりでは、種々のアーク溶接が施され、鋼板の
耐食性が十分でも溶接棒の材質によっては、溶融金属部
の耐食性が劣化するため、これを補う方法として亜鉛め
っきの犠牲防食作用が有効である。However, the corrosion resistance of this steel is insufficient, and higher corrosion protection performance has been demanded. Galvanization is effective for this corrosion. That is, in the suspension of automobiles, various arc welding is performed, and even if the corrosion resistance of the steel sheet is sufficient, the corrosion resistance of the molten metal part deteriorates depending on the material of the welding rod. Is effective.
【０００８】つぎに、溶接熱影響部の軟化防止方法を検
討した結果、ＮｂとＭｏの複合添加が必須であることを
知見した。この理由は明確ではないが、ＮｂとＭｏを複
合添加することにより、溶接により温度が上昇しても、
Ｍｏが成形等で導入された転位の消滅を抑え、この転位
が析出核となって、短時間で（Ｎｂ，Ｍｏ）Ｃが析出
し、溶接熱影響部の軟化を抑えるものと考えられる。さ
らにこの効果をより有効に発揮させるためには、伸び率
にして１．０％以上の塑性歪を加えることが好ましいこ
とを見い出した。Next, as a result of examining a method for preventing softening of the heat-affected zone of the welding, it was found that the combined addition of Nb and Mo is essential. The reason for this is not clear, but by adding Nb and Mo in combination, even if the temperature rises due to welding,
It is considered that Mo suppresses the disappearance of dislocations introduced by molding, etc., and these dislocations act as precipitation nuclei to precipitate (Nb, Mo) C in a short time, and suppress the softening of the weld heat affected zone. Furthermore, it has been found that it is preferable to add a plastic strain of 1.0% or more in terms of elongation in order to exert this effect more effectively.
【０００９】以下、各成分、歪量の限定理由を述べる。
Ｃは、セメンタイトのように大きな析出物となった場
合、腐食に際しカソード部分となりカップル電流が増加
し耐食性を劣化させるので、低い方が望ましいが、本発
明のように、Ｍｏが添加されている場合には高くても構
わず、０．２０％まで含有できる。０．２０％を超える
とたとえＭｏを添加しても耐食性が劣化するので０．２
０％を上限とする。また、０．００５％未満では、（Ｎ
ｂ，Ｍｏ）Ｃが析出しなくなり、溶接熱影響部の軟化防
止ができなくなるので０．００５％を下限とする。The reasons for limiting each component and the amount of strain will be described below.
When C becomes a large precipitate such as cementite, it becomes a cathode portion during corrosion and couple current increases and deteriorates corrosion resistance. Therefore, it is preferable that C is low, but when Mo is added as in the present invention. It does not matter if it is high, but it can be contained up to 0.20%. If it exceeds 0.20%, the corrosion resistance deteriorates even if Mo is added, so 0.2
The upper limit is 0%. If less than 0.005%, (N
b, Mo) C does not precipitate and the softening of the weld heat affected zone cannot be prevented, so 0.005% is made the lower limit.
【００１０】Ｓｉは、強度を得るための補助的元素とし
て用いる。０．００５％未満にするには製造コストがか
かり経済的に不利であるため、０．００５％を下限と
し、１．０％を超えると熱延段階でのスケールの除去に
コストがかかり経済的に不利であるため、１．０％を上
限とする。Si is used as an auxiliary element for obtaining strength. If it is less than 0.005%, it is economically disadvantageous because of the manufacturing cost, so 0.005% is the lower limit, and if it exceeds 1.0%, the scale removal in the hot rolling stage is costly and economical. Therefore, the upper limit is 1.0%.
【００１１】Ｍｎは、主として強度を得るための元素で
ある。０．１％未満では、溶製するのにコストがかかり
経済的に不利であるため、０．１％を下限とし、２．５
％を超えると加工性が劣化し、加工に耐えられなくなる
ため、２．５％を上限とする。Mn is an element mainly for obtaining strength. If it is less than 0.1%, it will be costly and economically disadvantageous to produce it.
%, The workability deteriorates and the workability cannot be endured, so 2.5% is made the upper limit.
【００１２】Ｐは、０．００１％未満では、工業的にコ
スト高を招くので０．００１％を下限とし、０．１０％
を超えると、２次加工性が劣化し、プレス成形時に割れ
たり、プレス成形後わずかな力で割れたりするので０．
１０％を上限とする。If P is less than 0.001%, the cost is industrially increased, so 0.001% is made the lower limit, and P is 0.10%.
If it exceeds 1.0, the secondary workability is deteriorated and cracks during press molding or cracks with a slight force after press molding.
The upper limit is 10%.
【００１３】Ｓは、錆の起点となるので少ない方が良
く、０．０１％以下とする必要がある。このため、上限
を０．０１％とし、また、０．００１％未満とするには
コストがかかるので０．００１％を下限とする。Since S is a starting point of rust, it is preferable that S is small, and it is necessary to set it to 0.01% or less. For this reason, the upper limit is set to 0.01%, and it is costly to make it less than 0.001%, so 0.001% is made the lower limit.
【００１４】Ａｌは、鋼の脱酸に必要な元素で、０．０
０５％未満では脱酸不足となり、ピンホールなどの欠陥
を生じるので、０．００５％を下限とし、０．１％を超
えると、アルミナなどの介在物が増加し、鋼の延性を損
ねるので０．１％を上限とする。Al is an element necessary for deoxidizing steel, and is 0.0
If it is less than 05%, deoxidation becomes insufficient and defects such as pinholes occur, so 0.005% is the lower limit, and if it exceeds 0.1%, inclusions such as alumina increase and the ductility of the steel is impaired. The upper limit is 1%.
【００１５】Ｎは、（Ｎｂ，Ｍｏ）Ｃの析出に関与し、
この析出物にわずかに含まれ強度確保に必要なので０．
０００５％以上含有させる。また、０．０１００％を超
えて含まれると、熱延段階でＮｂＮが析出し、溶接時の
溶接熱影響部の軟化防止に有効なＮｂ量を減らすことに
なるので、０．０１００％を上限とする。N is involved in the precipitation of (Nb, Mo) C,
It is slightly contained in this precipitate and is necessary for securing strength.
Include at least 0005%. Further, if it is contained in excess of 0.0100%, NbN will be precipitated in the hot rolling stage, and the amount of Nb effective in preventing softening of the heat affected zone during welding will be reduced, so 0.0100% is the upper limit. And
【００１６】Ｎｂは、Ｍｏとともに溶接熱影響部の軟化
を防止する効果があり、本発明に必須の元素である。
０．０１％未満では、溶接熱影響部の軟化防止効果がな
くなるので、０．０１％を下限とし、０．０５％を超え
ると加工性が劣化するので０．０５％を上限とする。Nb, together with Mo, has the effect of preventing softening of the weld heat affected zone and is an essential element of the present invention.
If it is less than 0.01%, the effect of preventing softening of the weld heat affected zone is lost, so 0.01% is the lower limit, and if it exceeds 0.05%, the workability deteriorates, so 0.05% is the upper limit.
【００１７】Ｍｏは、耐食性を向上させるとともに、Ｎ
ｂとの複合添加において溶接熱影響部の軟化を防止する
のに有効な元素であり、本発明に必須の元素である。Ｍ
ｏは０．１％未満では、耐食性と溶接熱影響部の軟化防
止効果がともになくなるので、０．１％を下限とし、
０．５％を超えると効果が飽和するとともに、疵の原因
となる介在物が多くなるので、０．５％を上限とする。Mo improves corrosion resistance and, at the same time, N
It is an element effective in preventing softening of the heat-affected zone of welding in a complex addition with b and is an essential element in the present invention. M
If o is less than 0.1%, both the corrosion resistance and the effect of preventing softening of the weld heat affected zone are lost, so 0.1% is made the lower limit,
If it exceeds 0.5%, the effect is saturated and the number of inclusions that cause defects increases, so 0.5% is made the upper limit.
【００１８】上記成分に調整された鋼を以下の方法に従
い鋼板となす。まず、転炉で鋼を溶製し、連続鋳造法に
よりスラブとなす。このスラブを高温状態のまま、ある
いは、室温まで冷却した後、加熱炉に装入し、１０００
〜１２５０℃の温度範囲で加熱し、その後８００〜９５
０℃の温度範囲で仕上圧延を行い、ついで７００℃以下
の温度で巻き取って熱延鋼板となす。The steel adjusted to the above composition is made into a steel sheet according to the following method. First, steel is melted in a converter and made into a slab by the continuous casting method. This slab is kept in a high temperature state or cooled to room temperature and then charged into a heating furnace to
Heating in the temperature range of ˜1250 ° C., then 800-95
Finish rolling is performed in a temperature range of 0 ° C., and then rolled at a temperature of 700 ° C. or lower to obtain a hot rolled steel sheet.
【００１９】酸洗後、直接めっきを施すかあるいは冷
延、焼鈍後めっきを施す。めっきの種類は亜鉛めっき、
アルミニウムめっき、亜鉛−アルミニウム合金めっき、
鉄−亜鉛合金めっき、あるいはそれらの組み合わせな
ど、犠牲防食作用のあるめっきとする。犠牲防食作用の
あるめっきとは、電気化学的に鋼板の電位よりも卑なも
のをいう。After pickling, plating is performed directly, or after cold rolling and annealing, plating is performed. The type of plating is zinc plating,
Aluminum plating, zinc-aluminum alloy plating,
The plating has a sacrificial anticorrosion action such as iron-zinc alloy plating or a combination thereof. Plating having a sacrificial anticorrosion action is electrochemically baser than the potential of the steel sheet.
【００２０】これにより、溶接部の耐食性を向上させる
ことができる。犠牲防食作用のあるめっきであれば、ア
ーク溶接部において、溶加材および母材の一部が露出し
ても、その部分の耐食性を十分カバーできるためであ
る。これらのめっきを３〜２００ｇ／ｍ2 の目付け量で
鋼板表面に施す。３ｇ／ｍ2 以下ではいずれのめっきも
犠牲防食作用がなくなり、また２００ｇ／ｍ2 を超える
とアーク溶接時にブローホールなどの欠陥が生じるため
である。As a result, the corrosion resistance of the welded portion can be improved. This is because if the plating has a sacrificial anticorrosive action, even if a part of the filler material and the base material is exposed in the arc welded portion, the corrosion resistance of the part can be sufficiently covered. These platings are applied to the surface of the steel sheet with a basis weight of 3 to 200 g / m 2 . This is because if the plating amount is 3 g / m 2 or less, the sacrificial anticorrosive action is lost in any plating, and if it exceeds 200 g / m 2 , defects such as blowholes occur during arc welding.
【００２１】かくして製造された鋼板に伸び率にして
１．０％以上１０．０％未満の塑性歪を加える。歪を加
える方法としては、スキンパス圧延、あるいは鋼板に切
り出した後引張歪を加えるなどの方法による。歪量は、
１．０％未満では導入される転位の量が少なく溶接熱影
響部の軟化を抑える効果がないため１．０％を下限と
し、１０．０％を超えると鋼板の延性が低下し成形が困
難になるので１０．０％を上限とする。伸び率１．０％
〜１０．０％とは、鋼板表面に罫書かれた標点が１．０
％〜１０．０％伸びる歪量をいう。かくして溶接部の疲
労強度と耐食性に優れた高強度めっき鋼板を得る。A plastic strain having an elongation of 1.0% or more and less than 10.0% is applied to the steel sheet thus manufactured. As a method for applying strain, there is a method such as skin pass rolling or a method of applying tensile strain after cutting into a steel plate. The amount of distortion is
If it is less than 1.0%, the amount of dislocations introduced is small and there is no effect of suppressing the softening of the weld heat affected zone, so 1.0% is the lower limit, and if it exceeds 10.0%, the ductility of the steel sheet decreases and forming is difficult. Therefore, the upper limit is 10.0%. Elongation rate 1.0%
~ 10.0% means that the marked points on the steel plate surface are 1.0
% To 10.0% elongation amount. Thus, a high-strength plated steel sheet having excellent fatigue strength and corrosion resistance of the welded portion is obtained.
【００２２】[0022]
【実施例】表１に示すＡ〜Ｏの化学成分の鋼を転炉で溶
製し、連続鋳造でスラブとした後、表１に示す条件で熱
延を行い、熱延鋼板（板厚２．３mm）となし、引き続き
冷延（板厚１．２mm）し、再結晶温度以上の焼鈍後電気
亜鉛めっき（２０ｇ／ｍ2 ，Ａ〜Ｄ，Ｊ〜Ｌ）を施した
ものと、溶融亜鉛めっき（４５ｇ／ｍ2 ，Ｅ〜Ｉ，Ｍ〜
Ｏ）を施したものを製造した。塑性歪はスキンパス圧延
により加えた。EXAMPLE Steels having chemical compositions A to O shown in Table 1 were melted in a converter and made into a slab by continuous casting, and then hot rolled under the conditions shown in Table 1 to obtain a hot rolled steel sheet (sheet thickness 2 .3 mm), followed by cold rolling (sheet thickness 1.2 mm), electro-galvanization (20 g / m 2 , A to D, J to L) after annealing at a recrystallization temperature or higher, and molten zinc Plating (45 g / m 2 , E ~ I, M ~
O) was produced. Plastic strain was added by skin pass rolling.
【００２３】これらの鋼板にアーク溶接を施し、母材と
溶接熱影響部の再軟化箇所の硬さを測定した。アーク溶
接条件は、電流；２５０Ａ，電圧；２５Ｖ，速度；１０
００mm／min，雰囲気；マグガスである。この最軟化部
の硬さと母材の硬さの差で溶接熱影響部の軟化性を評価
した。Arc welding was applied to these steel sheets, and the hardness of the re-softened portions of the base material and the welding heat affected zone was measured. Arc welding conditions are: current; 250A, voltage; 25V, speed; 10
00 mm / min, atmosphere; mag gas. The softness of the welding heat affected zone was evaluated by the difference between the hardness of the softest zone and the hardness of the base material.
【００２４】耐食性は、鋼板に燐酸塩処理（日本パーカ
ー製ＢＴＬ３０８０）を施した後、カチオン電着塗装
（日本ペイント製パワートップＤ−３０，２０μｍ塗
布）後、素地に達する疵を施し、塩水噴霧３５℃／６時
間−乾燥７０℃／ＲＨ６０％／４時間−湿潤４９℃／Ｒ
Ｈ９５％／４時間−冷却２０℃／４時間を１サイクルと
する促進テストを８０サイクル実施した際の疵部の侵食
深さで評価した。Corrosion resistance is determined by subjecting a steel sheet to a phosphate treatment (BTL3080 manufactured by Nippon Parker), followed by cation electrodeposition coating (NIPPON PAINT power top D-30, 20 μm coating), and then a flaw reaching the base material and salt spraying. 35 ° C / 6 hours-dry 70 ° C / RH 60% / 4 hours-wet 49 ° C / R
H 95% / 4 hours-cooling 20 [deg.] C./4 hours was evaluated as the erosion depth of the flaw portion after 80 cycles of the accelerated test.
【００２５】結果を表２に示す。本発明鋼は、溶接熱影
響部の軟化特性、耐食性ともに比較鋼に比べて優れてい
ることが判る。The results are shown in Table 2. It can be seen that the steel of the present invention is superior to the comparative steel in both the softening characteristics of the heat-affected zone of welding and the corrosion resistance.
【００２６】[0026]
【表１】 [Table 1]
【表２】 [Table 2]
【００２７】[0027]
【発明の効果】かくすることにより、耐食性と溶接熱影
響部の軟化の少ないすなわち溶接熱影響部の疲労特性に
優れた高強度めっき鋼板を提供することができ、工業上
大きな効果を奏することができる。As described above, it is possible to provide a high-strength plated steel sheet which is excellent in corrosion resistance and softening of the welding heat-affected zone, that is, excellent in fatigue characteristics of the welding heat-affected zone, and has a great industrial effect. it can.
Claims (3)
犠牲防食作用のあるめっきを施した高強度めっき鋼板。1. A weight ratio of C: 0.005 to 0.20%, Si: 0.005 to 1.0%, Mn: 0.1 to 2.5%, P: 0.001 to 0. 10%, S: 0.001-0.010%, Al: 0.005-0.1%, N: 0.0005-0.0100%, Nb: 0.01-0.05%, Mo: 0 1 to 0.50%, on the surface of the steel sheet consisting of the balance Fe and unavoidable impurities,
High-strength plated steel plate that has been plated with sacrificial anticorrosion.
度めっき鋼板。2. The high strength plated steel sheet according to claim 1, wherein the plating is zinc.
満の歪が加えられた請求項１又は２記載の高強度めっき
鋼板。3. The high-strength plated steel sheet according to claim 1 or 2, wherein a strain of 1.0% or more and less than 10.0% in terms of elongation is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00316492A JP3241075B2 (en) | 1992-01-10 | 1992-01-10 | High strength plated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00316492A JP3241075B2 (en) | 1992-01-10 | 1992-01-10 | High strength plated steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05186849A true JPH05186849A (en) | 1993-07-27 |
| JP3241075B2 JP3241075B2 (en) | 2001-12-25 |
Family
ID=11549721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00316492A Expired - Lifetime JP3241075B2 (en) | 1992-01-10 | 1992-01-10 | High strength plated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3241075B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000004200A1 (en) * | 1998-07-16 | 2000-01-27 | Nippon Steel Corporation | High-strength steel plate reduced in softening in weld heat-affected zone |
| US6709535B2 (en) | 2002-05-30 | 2004-03-23 | Kobe Steel, Ltd. | Superhigh-strength dual-phase steel sheet of excellent fatigue characteristic in a spot welded joint |
-
1992
- 1992-01-10 JP JP00316492A patent/JP3241075B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000004200A1 (en) * | 1998-07-16 | 2000-01-27 | Nippon Steel Corporation | High-strength steel plate reduced in softening in weld heat-affected zone |
| EP1026274A1 (en) * | 1998-07-16 | 2000-08-09 | Nippon Steel Corporation | High-strength steel plate reduced in softening in weld heat-affected zone |
| US6428631B1 (en) | 1998-07-16 | 2002-08-06 | Nippon Steel Corporation | High-strength steel sheet having excellent formality and resistance to softening of the heat affected zone after welding |
| KR100368461B1 (en) * | 1998-07-16 | 2003-01-24 | 신닛뽄세이테쯔 카부시키카이샤 | High-strength steel plate reduced in softening in weld heat-affected zone |
| EP1026274A4 (en) * | 1998-07-16 | 2005-01-19 | Nippon Steel Corp | High-strength steel plate reduced in softening in weld heat-affected zone |
| US6709535B2 (en) | 2002-05-30 | 2004-03-23 | Kobe Steel, Ltd. | Superhigh-strength dual-phase steel sheet of excellent fatigue characteristic in a spot welded joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3241075B2 (en) | 2001-12-25 |
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