JP2745823B2 - Manufacturing method of as-roll type ultra-high tensile ERW steel pipe for vehicle door impact bar excellent in flattening test characteristics - Google Patents
Manufacturing method of as-roll type ultra-high tensile ERW steel pipe for vehicle door impact bar excellent in flattening test characteristicsInfo
- Publication number
- JP2745823B2 JP2745823B2 JP2418482A JP41848290A JP2745823B2 JP 2745823 B2 JP2745823 B2 JP 2745823B2 JP 2418482 A JP2418482 A JP 2418482A JP 41848290 A JP41848290 A JP 41848290A JP 2745823 B2 JP2745823 B2 JP 2745823B2
- Authority
- JP
- Japan
- Prior art keywords
- high tensile
- steel pipe
- less
- impact bar
- manufacturing
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/60—Subframe construction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/70—Materials used in suspensions
- B60G2206/72—Steel
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】本発明は車輌ドアインパクトバー
用アズロールタイプ超高張力電縫鋼管の製造方法に係
り、自動車用ドア内部などにおけるインパクトバー用と
して好ましい高強度を有すると共に形状ないし品質的に
優れた電縫鋼管を安定且つ低コストに製造することので
きる方法を提供しようとするものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an as-roll type ultra-high tensile electric resistance welded steel pipe for a vehicle door impact bar. It is an object of the present invention to provide a method capable of stably and at low cost producing an electric resistance welded steel pipe excellent in quality.
【0002】[0002]
【従来の技術】自動車などの車輌用ドアに関し、側面衝
突時などにおける安全性を図り、しかも軽量性を得るた
めに鋼管などによるドアインパクトバーと称される補強
材を内部に設けることが行われている。即ち、このよう
なインパクトバーとして従来70〜80キロ級のものが
一般的に用いられているが、近時公開されたものに特開
平2−197525号公報があり、造管まま、もしくは
低温の歪取焼鈍後にて引張強さが60〜100kgf /mm
2 を示すものとされている。2. Description of the Related Art A door for a vehicle such as an automobile is provided with a reinforcing member called a door impact bar made of a steel pipe or the like in order to secure safety in a side collision or the like and to obtain a light weight. ing. That is, a 70-80 kg class impact bar has been generally used as such an impact bar. Recently, Japanese Unexamined Patent Publication (Kokai) No. 2-197525 has been disclosed, Tensile strength after strain relief annealing is 60-100 kgf / mm
2 is indicated.
【0003】[0003]
【発明が解決しようとする課題】然し上記のような従来
の技術によるものにおいては上記したインパクトバー用
とした場合において必ずしも好ましいものでない。即ち
引張強度において前記の程度では前記したような目的に
おいてなお不充分であり、必然的にそれなりに厚肉とな
り、軽量化・安全性強化が充分に図られない。However, the above-mentioned prior art is not always preferable in the case of the above-mentioned impact bar. That is, the above-mentioned degree of tensile strength is still insufficient for the above-described purpose, and the thickness is inevitably increased, and the weight and safety are not sufficiently enhanced.
【0004】このような不利を避けるために素材成分を
特定し又所要の元素を添加したものとして準備し得られ
た冷延板を用いて溶接造管してから別ラインにおいて均
熱焼入れ、焼戻し等の処理をなすことが考えられるが、
造管して定寸に切断された鋼管に対する処理となるから
その工程は煩雑で多くの工数を必要とし、必然的に高価
とならざるを得ない。しかも品質的に表面粗度が劣る不
利がある。[0004] In order to avoid such disadvantages, the raw material components are specified, and the required elements are added. The obtained cold rolled sheet is used to form a welded pipe and then soaked and tempered in another line. It is conceivable to perform processing such as
Since the process is performed on a steel pipe that has been formed and cut to a fixed size, the process is complicated, requires many man-hours, and is inevitably expensive. In addition, there is a disadvantage that the surface roughness is inferior in quality.
【0005】[0005]
【課題を解決するための手段】本発明は上記したような
従来のものにおける技術的課題を解決することについて
検討を重ね、創案されたものであって以下の如くであ
る。重量%で、C:0.1〜0.2%、Mn:1.2〜
1.8%、Si:0.2〜0.5%、S:0.010%
以下、P:0.030%以下、sol.Al:0.05
0%以下を含有する鋼を熱間圧延、冷間圧延し連続熱処
理設備に送り、該連続焼鈍設備において800〜910
℃に加熱し1分以上均熱してから水焼入れし、連続的に
600〜900℃/secで急速冷却を行い、100〜
300℃の過時効処理を行い得られる超高張力鋼帯を電
縫鋼管製造設備において電縫熔接すると共に該熔接シー
ム部を650〜850℃で局部熱処理することを特徴と
する偏平化試験特性に優れた車輌ドアインパクトバー用
アズロールタイプ超高張力電縫鋼管の製造方法。SUMMARY OF THE INVENTION The present invention is studying on to solve the technical problems in the prior art Do you I above, is as follows A was conceived. By weight%, C: 0.1-0.2%, Mn: 1.2-
1.8%, Si: 0.2-0.5%, S: 0.010%
Or less, P: 0.030% or less, sol. Al: 0.05
The steel containing 0% or less hot rolling, cold rolling and continuous heat treatment
To the treatment equipment, and 800 to 910 in the continuous annealing equipment.
℃, soak for more than 1 minute, water quench, and continuously
Rapid cooling at 600-900 ° C / sec.
An ultra-high tensile steel strip obtained by overaging at 300 ° C. is subjected to ERW welding at an ERW pipe manufacturing facility and the welded seam is locally heat-treated at 650 to 850 ° C. An excellent method for manufacturing an as-roll type ultra-high tensile ERW steel pipe for vehicle door impact bars.
【0006】[0006]
【作用】上記したような本発明について、先ず鋼の成分
限定理由をwt%(以下単に%という)により説明すると
以下の如くである。In the present invention as described above, the reasons for limiting the composition of steel will first be described in terms of wt% (hereinafter simply referred to as%) as follows.
【0007】C:0.1〜0.2% Cは、マルテンサイト生成元素であり、且つマルテンサ
イトの硬さを高める元素であるから本発明の目的とする
強度を得る上において不可欠の元素であり、インパクト
バーとして好ましい強度を得るために0.1%程度が必要
である。又0.2%を超えると鋼スラブに割れが生じ易く
なるのでこれを上限とする。C: 0.1 to 0.2 % C is a martensite-generating element and an element that increases the hardness of martensite, and is therefore an indispensable element for obtaining the intended strength of the present invention. Yes, about 0.1 % is necessary to obtain a preferable strength as an impact bar. If the content exceeds 0.2 %, the steel slab is likely to crack.
【0008】Mn:1.2 〜1.8 % Mnは、オーステナイトの焼入性を向上させる元素であ
って、マルテンサイト量をコントロールし、所定強度を
安定に得るためには1.2 %以上が必要である。又本発明
の特性を効果的に得るために急速水焼入れによる連続焼
鈍設備で実施した場合において上記効果が飽和し、却っ
て悪影響を来すことから1.8%を上限とした。Mn: 1.2 to 1.8% Mn is an element for improving the hardenability of austenite. To control the amount of martensite and stably obtain a predetermined strength, Mn is required to be at least 1.2%. Further, in order to effectively obtain the characteristics of the present invention, the above effect is saturated in the case of performing the continuous annealing equipment by rapid water quenching, which adversely affects the characteristics.
【0009】Si:0.2 〜0.5 % Siは、脱酸元素であり、鋼板の機械的特性に寄与する
元素として0.2 %以上を必要とする。然し0.5 %を超え
ると、電縫溶接に好ましくない傾向が認められ、電縫管
の機械的性質が劣化し、あるいは耐衝撃性などが低下す
るので、これを上限とする。Si: 0.2-0.5% Si is a deoxidizing element and requires 0.2% or more as an element contributing to the mechanical properties of the steel sheet. However, if it exceeds 0.5%, an unfavorable tendency is observed in ERW, and the mechanical properties of the ERW pipe deteriorate or the impact resistance decreases, so the upper limit is set.
【0010】本発明によるものは原則的には上記C、M
n、Siを必須元素とするもので、残部についてはFe
及び不可避的不純物であって、S:0.010%以下、P:
0.030 %以下、sol.Al:0.050 %以下とするものであ
り、このようにすることにより電縫溶接部などにおける
品質を向上する。According to the present invention, in principle, the above C, M
n and Si as essential elements, and the remainder is Fe
And unavoidable impurities, S: 0.010% or less, P:
The content is set to 0.030% or less, and sol. Al: 0.050% or less. By doing so, the quality in an electric resistance welded portion or the like is improved.
【0011】なお、本発明のものは、必要に応じてN
b:0.05%以下、Cr:1.0 %以下、Mo:0.6 %以
下、V:0.12%以下、Ti:0.1 %以下、B:0.01%以
下の1種または2種以上を限定された範囲内で添加し、
各元素による特性を利用することができる。In the present invention, if necessary, N
One or more of b: 0.05% or less, Cr: 1.0% or less, Mo: 0.6% or less, V: 0.12% or less, Ti: 0.1% or less, B: 0.01% or less added within a limited range. And
The characteristics of each element can be used.
【0012】上記のような成分組成を有する鋼は熱間圧
延、冷間圧延して鋼帯とされるが、斯かる鋼帯は連続焼
鈍設備に送り、800〜910℃に加熱し、均熱され
る。800℃はオーステナイト組織を得るために必要な
温度条件であり、一方上限の910℃はオーステナイト
粒の粗大化を回避し、加工性および衝撃特性に悪影響を
及ぼす。均熱時間は一般的に1分以上として鋼板におけ
る温度分布のばらつきをなからしめ、オーステナイト組
織を鋼板の幅方向において均一に得しめる。The steel having the above-mentioned composition is hot-rolled and cold-rolled into a steel strip. The steel strip is sent to a continuous annealing facility and heated to 800 to 910 ° C. It is. 800 ° C. is a temperature condition necessary for obtaining an austenite structure, while an upper limit of 910 ° C. avoids coarsening of austenite grains and adversely affects workability and impact properties. The soaking time is generally set to 1 minute or more so that the variation in the temperature distribution in the steel sheet is taken into account, and the austenite structure can be uniformly obtained in the width direction of the steel sheet.
【0013】上記のように均熱されたものは水焼入れさ
れ、連続的に200〜1200℃/sec (好ましくは6
00〜900℃/sec)の急速冷却されるが、必要に応じ
て100〜300℃の過時効処理を行うことができる。
即ち前記均熱のままでは固溶Cが多く熱的に不安定であ
り、インパクトバーの塗装時に引張強度が変化するため
上記温度範囲の過時効処理を行うもので、100℃未満
では該効果が得られず、300℃を超えるとマルテンサ
イトが軟化し強度の低下が大きいので上限温度範囲とす
る。The soaked material is water-quenched and continuously heated at 200 to 1200 ° C./sec (preferably 6 to 1200 ° C./sec).
(00-900 ° C / sec), but can be overaged at 100-300 ° C as needed.
In other words, if the temperature is soaked, the solid solution C is large and thermally unstable, and the tensile strength changes during the coating of the impact bar, so that the overaging treatment is performed in the above temperature range. If the temperature exceeds 300 ° C., martensite is softened and the strength is greatly reduced.
【0014】前記した急速冷却については、200℃/
sec 未満ではマルテンサイトの生成が適切に行われず、
一方1200℃/sec 超えでは工業的に不利であって、
上記範囲の冷却速度は連続的に加熱、均熱して鋼帯を加
熱し、50〜120m/minで送られる鋼帯に対し連続
焼鈍設備における冷却帯において噴流水の如きを用い、
適切に実施することができる。The rapid cooling described above is performed at 200 ° C. /
If it is less than sec, the generation of martensite will not be performed properly,
On the other hand, if it exceeds 1200 ° C / sec, it is industrially disadvantageous,
The cooling rate in the above range is continuously heated and soaked to heat the steel strip, and the steel strip sent at 50 to 120 m / min is used in the cooling zone in the continuous annealing equipment, such as jet water,
Can be properly implemented.
【0015】前記のように急冷された鋼帯は本発明にお
いて引続き電縫溶接設備に送られ、成形ロールにより円
形に弯曲成形され且つ電極ロール間において対向した端
縁を接合せしめて電縫管とされる。この電縫溶接速度と
しては20〜100m/min、好ましくは30〜60m
/min で実施される。In the present invention, the steel strip quenched as described above is continuously sent to an electric resistance welding machine, is formed into a curved shape by a forming roll, and is joined to the electric resistance welding pipe by joining the opposite edges between the electrode rolls. Is done. The electric resistance welding speed is 20 to 100 m / min, preferably 30 to 60 m / min.
/ Min.
【0016】前記電縫造管設備の溶接以後の概要は図1
の如くであって、鋼板Pは溶接ロール1で溶接されたも
のが空冷ゾーン3、水冷ゾーン4を経てサイジングロー
ル5で矯正され、切断機6切断されるが、前記溶接ロー
ルの直後にシーム熱処理機構2により加熱処理される。FIG. 1 shows an outline of the above-mentioned electric resistance welded pipe equipment after welding.
A is as, steel P those welded by the welding roll 1 is corrected with a sizing roll 5 through air cooling zone 3, the water cooling zone 4, is cleaved machine 6 cut seam immediately following the welding rolls Heat treatment is performed by the heat treatment mechanism 2.
【0017】上記のように電縫溶接して送られる電縫鋼
管に対する前記熱処理機構2は電縫溶接シーム部に対し
幅が10mm前後で長さが3〜10m、好ましくは4〜6
m程度の高周波誘導加熱機構が設けられ、走行する電縫
鋼管の溶接部を局部加熱する。即ちこのような局部加熱
によって電縫溶接時の急速加熱、急冷により硬化した組
織を適切に改善し、偏平化その他の加工時において溶接
部における割れ発生などを回避せしめる。The heat treatment mechanism 2 for the ERW steel pipe fed by ERW welding as described above has a width of about 10 mm and a length of 3 to 10 m, preferably 4 to 6 m, with respect to the ERW seam.
A high-frequency induction heating mechanism of about m is provided to locally heat the welded portion of the running ERW steel pipe. That is, by such local heating, the structure hardened by rapid heating and rapid cooling at the time of electric resistance welding is appropriately improved, and generation of cracks at the welded portion at the time of flattening or other processing is avoided.
【0018】[0018]
【実施例】上記したような本発明によるものの具体的な
実施例について説明すると本発明者等は次の表1に示す
ような130kgf/mm2 級の成分組成をもった各鋼を準備
した。The present invention as described above will be described in detail with reference to specific examples. The present inventors prepared each steel having a component composition of 130 kgf / mm 2 grade as shown in Table 1 below.
【0019】[0019]
【表1】 [Table 1]
【0020】上記表1の各鋼は仕上温度Ar3 点以上で
熱延仕上げられ、均一な組織で厚さ5.2mmの熱延板とさ
れてから500〜650℃の温度で一般的に巻取られ
る。この熱延板はライン上の酸洗槽で酸洗後冷間圧延さ
れて厚さ2.1mmの冷延板とした。Each of the steels in Table 1 is hot-rolled at a finishing temperature of at least three points Ar and formed into a hot-rolled sheet having a uniform structure and a thickness of 5.2 mm, and then generally rolled at a temperature of 500 to 650 ° C. Taken. This hot-rolled sheet was pickled in a pickling tank on the line and then cold-rolled to form a cold-rolled sheet having a thickness of 2.1 mm.
【0021】上記冷延板は連続焼鈍設備において、その
加熱帯で790〜890℃に加熱されてから5分間の均
熱帯における均熱処理を受け、次いで冷却帯に送出され
て噴流水を用い、約800℃/secで冷却され、厚さ2.1
mm常温の冷延鋼帯とされた。[0021] The cold-rolled sheet in a continuous annealing equipment receives the soaking in the soaking zone of 5 minutes after being heated to seven hundred ninety to eight hundred and ninety ° C. at which pressurized hot zone, then sent using jet water cooling zone, Cooled at about 800 ° C / sec, thickness 2.1
mm Cold-rolled steel strip at room temperature.
【0022】前記したような工程を経た冷延鋼帯は電縫
溶接設備に送られ、45m/min の速度で、成形ロール
およびスクイズロールを経しめ電縫溶接した。The cold rolled steel strip having undergone the above-described steps was sent to an electric resistance welding equipment, and was subjected to electric resistance welding at a speed of 45 m / min through a forming roll and a squeeze roll.
【0023】得られた溶接鋼管は次いで長さ5mの前記
熱処理機構2を通過せしめて製品とした。得られた電縫
鋼管における機械的特性を試験測定した結果を図示する
と図2に示す通りである。The obtained welded steel pipe was then passed through the heat treatment mechanism 2 having a length of 5 m to obtain a product. FIG. 2 shows the results of test measurement of the mechanical properties of the obtained ERW steel pipe.
【0024】なお前記のようにして得られた製品につい
て図3に示すような偏平化して溶接部に割れが発生した
時の高さH、即ち偏平高さを求めた結果は次の表2に示
す如くであり、本発明により割れの発生する偏平高さは
何れも3分の1以下に縮減され、著しく改善されている
ことが確認された。The height H when the product obtained as described above was flattened as shown in FIG. 3 and cracks occurred in the weld, that is, the flattened height was obtained. As shown in the figure, it was confirmed that the flat height at which cracks were generated was reduced to one third or less according to the present invention, and that the height was remarkably improved.
【0025】[0025]
【表2】 [Table 2]
【0026】[0026]
【発明の効果】以上説明したような本発明によるときは
引張強度が高く、しかも偏平化試験特性のおいても優れ
たドアインパクトバー用鋼管を高性能且つ低コストに均
一な特性をもった製品として製造することができるもの
であるから工業的にその効果の大きい発明である。According to the present invention as described above, a steel pipe for door impact bars having high tensile strength and excellent flattening test characteristics is provided with uniform characteristics at high performance and at low cost. Therefore, the invention is industrially highly effective.
【図1】本発明についての装置概要を示した説明図であ
る。FIG. 1 is an explanatory diagram showing an outline of an apparatus according to the present invention.
【図2】本発明による電縫溶接インパクトバーの1例に
ついて引張試験結果を示すグラフである。FIG. 2 is a graph showing a tensile test result of one example of the electric resistance welded impact bar according to the present invention.
【図3】偏平化試験において割れ発生の偏平高さを求め
る要領の説明図である。FIG. 3 is an explanatory diagram of a procedure for obtaining a flat height at which a crack occurs in a flattening test.
1 溶接ロール 2 シーム熱処理装置 3 空冷ゾーン 4 水冷ゾーン 5 サイジングロール 6 カットオフ Reference Signs List 1 welding roll 2 seam heat treatment device 3 air cooling zone 4 water cooling zone 5 sizing roll 6 cut-off
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI C21D 9/50 101 C21D 9/50 101A C22C 38/00 301 C22C 38/00 301U 38/06 38/06 (72)発明者 杉本 裕二 東京都千代田区丸の内一丁目1番2号 日本鋼管株式会社内 (72)発明者 森本 美登志 東京都千代田区丸の内一丁目1番2号 日本鋼管株式会社内 (72)発明者 高村 美登志 東京都千代田区丸の内一丁目1番2号 日本鋼管株式会社内 (56)参考文献 特開 昭60−224717(JP,A) 特開 昭50−86442(JP,A)──────────────────────────────────────────────────の Continuation of front page (51) Int.Cl. 6 Identification code FI C21D 9/50 101 C21D 9/50 101A C22C 38/00 301 C22C 38/00 301U 38/06 38/06 (72) Inventor Sugimoto Yuji 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Mitoshi Morimoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. 1-2-1 Kumarunouchi Nippon Kokan Co., Ltd. (56) References JP-A-60-224717 (JP, A) JP-A-50-86442 (JP, A)
Claims (1)
n:1.2〜1.8%、Si:0.2〜0.5%、S:
0.010%以下、P:0.030%以下、sol.A
l:0.050%以下を含有する鋼を熱間圧延、冷間圧
延し連続熱処理設備に送り、該連続焼鈍設備において8
00〜910℃に加熱し1分以上均熱してから水焼入れ
し、連続的に600〜900℃/secで急速冷却を行
い、100〜300℃の過時効処理を行い得られる超高
張力鋼帯を電縫鋼管製造設備において電縫熔接すると共
に該熔接シーム部を650〜850℃で局部熱処理する
ことを特徴とする偏平化試験特性に優れた車輌ドアイン
パクトバー用アズロールタイプ超高張力電縫鋼管の製造
方法。C .: 0.1 to 0.2% by weight, M in weight%
n: 1.2 to 1.8%, Si: 0.2 to 0.5%, S:
0.010% or less, P: 0.030% or less, sol. A
l: Steel hot rolling containing 0.050% or less, Hiyakan圧
And then sent to the continuous heat treatment equipment, where the continuous annealing equipment
Heat to 00-910 ° C, soak for at least 1 minute, then water quench
And rapid cooling at 600 to 900 ° C / sec continuously.
Flattening, wherein an ultra-high tensile steel strip obtained by overaging at 100 to 300 ° C. is subjected to ERW welding at an ERW pipe manufacturing facility, and the welded seam portion is locally heat-treated at 650 to 850 ° C. Manufacturing method of as-roll type ultra-high tensile electric resistance welded steel pipe for vehicle door impact bar which has excellent aging test characteristics.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2418482A JP2745823B2 (en) | 1990-12-29 | 1990-12-29 | Manufacturing method of as-roll type ultra-high tensile ERW steel pipe for vehicle door impact bar excellent in flattening test characteristics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2418482A JP2745823B2 (en) | 1990-12-29 | 1990-12-29 | Manufacturing method of as-roll type ultra-high tensile ERW steel pipe for vehicle door impact bar excellent in flattening test characteristics |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04289122A JPH04289122A (en) | 1992-10-14 |
JP2745823B2 true JP2745823B2 (en) | 1998-04-28 |
Family
ID=18526318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2418482A Expired - Fee Related JP2745823B2 (en) | 1990-12-29 | 1990-12-29 | Manufacturing method of as-roll type ultra-high tensile ERW steel pipe for vehicle door impact bar excellent in flattening test characteristics |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2745823B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTO980785A1 (en) * | 1998-09-16 | 2000-03-16 | M A C S P A | STRUCTURAL ELEMENT FOR A VEHICLE. |
JP4608739B2 (en) * | 2000-06-14 | 2011-01-12 | Jfeスチール株式会社 | Manufacturing method of steel pipe for automobile door reinforcement |
US6518533B1 (en) * | 2001-11-01 | 2003-02-11 | Ltv Steel Company, Inc. | High strength steel tubing |
DE102010012830B4 (en) * | 2010-03-25 | 2017-06-08 | Benteler Automobiltechnik Gmbh | Method for producing a motor vehicle component and body component |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5086442A (en) * | 1973-12-06 | 1975-07-11 | ||
JPS5397964A (en) * | 1977-02-09 | 1978-08-26 | Toshiba Corp | Preparation of electric welded steel tube |
JPS60224717A (en) * | 1984-04-20 | 1985-11-09 | Nippon Steel Corp | Manufacture of high-tension cold-rolled steel sheet having superior cold workability and weldability |
JPS61272318A (en) * | 1985-05-28 | 1986-12-02 | Nippon Steel Corp | Manufacture of seam welded steel pipe for high strength oil well pipe |
-
1990
- 1990-12-29 JP JP2418482A patent/JP2745823B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH04289122A (en) | 1992-10-14 |
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