JPH11350074A - Bainitic rail excellent in gas-pressure weldability - Google Patents
Bainitic rail excellent in gas-pressure weldabilityInfo
- Publication number
- JPH11350074A JPH11350074A JP30262298A JP30262298A JPH11350074A JP H11350074 A JPH11350074 A JP H11350074A JP 30262298 A JP30262298 A JP 30262298A JP 30262298 A JP30262298 A JP 30262298A JP H11350074 A JPH11350074 A JP H11350074A
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- Prior art keywords
- rail
- gas pressure
- welding
- gas
- pressure
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主にガス圧接によ
り長尺レールとして用いられる鉄道用レールに関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway rail mainly used as a long rail by gas pressure welding.
【０００２】[0002]
【従来の技術】近年、鉄道用レールは、軌道の保守・点
検の簡略化、騒音・振動の抑制、乗り心地の向上の観点
から溶接によるロングレール化が進められている。用い
られる溶接法には、フラッシュバット溶接、ガス圧接、
エンクローズアーク溶接およびテルミット溶接などがあ
る。2. Description of the Related Art In recent years, railroad rails have been developed into long rails by welding from the viewpoints of simplifying track maintenance and inspection, suppressing noise and vibration, and improving ride comfort. Welding methods used include flash butt welding, gas pressure welding,
There are enclosed arc welding and thermite welding.
【０００３】これらの溶接方法の中でフラッシュバット
やガス圧接は、文献（鉄と鋼 Vol.７０，No．１０，１
９８４）にも示されているようにレールのロング化には
必須の技術となっている。これらの接合の場合、レール
同士を接合するため、その接合性はレール鋼成分の影響
を受けやすい。Among these welding methods, flash butt and gas pressure welding are described in the literature (Iron and Steel Vol. 70, No. 10, 1).
984), it is an indispensable technology for elongating the rail. In the case of these joinings, since the rails are joined together, the joining property is easily affected by the rail steel component.
【０００４】特にガス圧接では、接合すべき端面を突き
合わせて密着させ、レール軸方向に加圧しながら大気中
にて酸素−アセチレン炎で外周から加熱し接合するた
め、接合界面に酸化物が生成し、場合によっては多元系
の低融点酸化物となり、欠陥となる。In gas pressure welding, in particular, the end faces to be joined are brought into close contact with each other, and heated and joined from the outer periphery with an oxygen-acetylene flame in the atmosphere while being pressed in the rail axis direction, so that an oxide is generated at the joint interface. In some cases, it becomes a multi-component low-melting-point oxide and becomes a defect.
【０００５】そこで、酸化を防止するために特開平７−
２２７６８４号公報や特開平７−２３２２８５号公報な
どにみられるように端面をシールし、酸素の侵入を防止
するか、侵入酸素をガス化元素で除去する方法などが検
討されている。In order to prevent oxidation, Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent Application No. 227684 and Japanese Patent Application Laid-Open No. Hei 7-232285, a method of sealing an end face to prevent intrusion of oxygen, or removing invading oxygen with a gasifying element has been studied.
【０００６】また、レール鋼としては、従来から用いら
れている高炭素鋼があるが、この場合、一度、生成した
酸化物が鋼中の炭素により、還元されうることが文献
（溶接学会論文集 第１４巻，第２号，１９９６）に述
べられており、鋼中炭素のガス圧接性向上に寄与すると
考えられる。[0006] As a rail steel, there is a conventionally used high carbon steel. In this case, it has been reported that once formed oxide can be reduced by carbon in the steel (Journal of the Japan Welding Society). Vol. 14, No. 2, 1996), and is considered to contribute to improving the gas pressure contact property of carbon in steel.
【０００７】一方、最近、レールの表面損傷性を向上さ
せる手段として比較的炭素量が低く、合金を添加したベ
イナイト鋼の利用が、特開平２−２８２４４８号公報や
特開平８−９２６９６号公報などに紹介されている。こ
れらのレール鋼は、従来の高炭素鋼に比較し、炭素量が
低く、先に述べた炭素の還元効果が減じることが懸念さ
れる。On the other hand, recently, as a means for improving the surface damage of rails, the use of bainite steel having a relatively low carbon content and containing an alloy has been proposed in Japanese Patent Application Laid-Open Nos. 2-282448 and 8-92696. Has been introduced. These rail steels have a lower carbon content than conventional high carbon steels, and there is a concern that the above-described carbon reduction effect may be reduced.
【０００８】[0008]
【発明が解決しようとする課題】レール鋼は構造部材で
あり、その特性上、強度の確保が必要な材料である。し
たがって、鉄に合金を添加して製造される場合が殆ど
で、それらの強化元素であるＳｉ，Ｍｎ，Ｃｒなどの合
金添加は必須となる。SUMMARY OF THE INVENTION Rail steel is a structural member, and it is a material whose strength must be ensured due to its characteristics. Therefore, it is almost always manufactured by adding an alloy to iron, and it is essential to add an alloy such as Si, Mn, or Cr, which is a strengthening element thereof.
【０００９】これらの元素の単独あるいは複合の酸化物
は比較的融点が高く、ガス圧接温度の最高加熱温度より
高いため、溶融は生じないが、これらにＡｌの酸化物が
融合すると、その融点が１１００℃程度のムライトと呼
ばれるＡｌ−Ｓｉ−Ｍｎ系酸化物を形成し、欠陥の原因
となる。Oxides of these elements, alone or in combination, have relatively high melting points and are not melted because they are higher than the maximum heating temperature of the gas pressure welding temperature. An Al—Si—Mn-based oxide called mullite at about 1100 ° C. is formed, which causes defects.
【００１０】レール鋼の脱酸では、このＡｌの混入を可
能な限り防止するために、Ｓｉ脱酸などＡｌキルド以外
の方法が用いられる場合が多いが、その場合でも微量の
Ａｌの混入は不可避で、その結果、圧接時の欠陥発生に
影響を及ぼす場合がある。In the deoxidization of rail steel, a method other than Al killing, such as deoxidation of Si, is often used in order to prevent the incorporation of Al as much as possible. As a result, the occurrence of defects during pressure welding may be affected.
【００１１】本発明の課題は、耐表面損傷性を改善する
ために、従来のレール鋼に比較して炭素量を低減し、合
金を添加したベイナイト系レールの圧接時の圧接界面で
のこの微量混入Ａｌの酸化を防止し、多元系の低融点複
合酸化物生成を防止することにある。An object of the present invention is to improve the surface damage resistance by reducing the amount of carbon as compared with conventional rail steels, and reducing the trace amount of the bainite-based rail to which an alloy has been added at the press-bonded interface during press-bonding. An object of the present invention is to prevent oxidation of mixed Al and prevent formation of a multi-component low melting point composite oxide.
【００１２】[0012]
【課題を解決するための手段】本発明は、レールのガス
圧接時の圧接界面でのレール鋼中微量Ａｌの酸化を防止
し、多元系の低融点複合酸化物生成を防止できるレール
であり、その要旨は、（１） 質量％で、 Ｃ ：０．１５〜０．４５、 Ｓｉ：０．１０〜０．５０、 Ｍｎ：０．３０〜１．２０、 Ｃｒ：０．２０〜３．００、 Ｎ ：０．００６０〜０．０２００ を含有し、残部が鉄および不可避的不純物からなること
を特徴とするガス圧接性に優れたベイナイト系レール。SUMMARY OF THE INVENTION The present invention is a rail capable of preventing the oxidation of trace amounts of Al in rail steel at the pressure contact interface at the time of gas pressure welding of the rail and preventing the formation of a multi-component low melting point composite oxide. The gist is (1) mass%, C: 0.15 to 0.45, Si: 0.10 to 0.50, Mn: 0.30 to 1.20, Cr: 0.20 to 3.00 , N: 0.0060 to 0.0200, with the balance being iron and unavoidable impurities, the bainitic rail having excellent gas pressure contact property.
【００１３】（２） 質量％で、 Ｃ ：０．１５〜０．４５、 Ｓｉ：０．１０〜０．５０、 Ｍｎ：０．３０〜１．２０、 Ｃｒ：０．２０〜３．００、 Ｎ ：０．００６０〜０．０２００ を含有し、さらに、 Ｍｏ：０．０５〜１．００、 Ｃｕ：０．０５〜１．００、 Ｎｉ：０．０５〜１．００、 Ｎｂ：０．００５〜０．０５、 Ｖ ：０．０１〜０．２０、 Ｔｉ：０．０００５〜０．００５０、 Ｂ ：０．０００１〜０．００５０ の一種または二種以上を含有し、残部が鉄および不可避
的不純物からなることを特徴とするガス圧接性に優れた
ベイナイト系レール。(2) In mass%, C: 0.15 to 0.45, Si: 0.10 to 0.50, Mn: 0.30 to 1.20, Cr: 0.20 to 3.00, N: 0.0060 to 0.0200, Mo: 0.05 to 1.00, Cu: 0.05 to 1.00, Ni: 0.05 to 1.00, Nb: 0.005 -0.05, V: 0.01-0.20, Ti: 0.0005-0.0050, B: 0.0001-0.0050, with the balance being iron and inevitable A bainite-based rail with excellent gas pressure contact, characterized by being made of impurities.
【００１４】（３）ガス圧接性が、ガス圧接時に圧接界
面での低融点酸化物生成による割れを生じないことであ
ることを特徴とする前記（１）または（２）に記載のガ
ス圧接性に優れたベイナイト系レールである。(3) The gas pressure contact property according to the above (1) or (2), wherein the gas pressure contact property is such that cracking due to the formation of a low melting point oxide at the pressure contact interface does not occur at the time of gas pressure contact. An excellent bainite rail.
【００１５】[0015]
【発明の実施の形態】以下、本発明について詳細に説明
する。Ｃ，Ｓｉ，Ｍｎ，Ｃｒは、レールの耐表面損傷性
を改善するために具備すべき強度を満足し、かつ低炭素
のベイナイト組織を得るために必要な元素であり、それ
ぞれの上限、下限の値はそれらの効果が最適となる値で
ある。すなわち、Ｃは連続冷却の状態で、その含有量が
０．１５％に満たない場合、フェライトの生成を招き、
また、０．４５％を超えるとパーライトの生成や残留γ
（オーステナイト）の生成を招きやすくなる。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. C, Si, Mn, and Cr are elements that satisfy the strength to be provided for improving the surface damage resistance of the rail and are necessary to obtain a low carbon bainite structure. The value is the value at which those effects are optimal. That is, when C is continuously cooled and its content is less than 0.15%, ferrite is formed,
On the other hand, if it exceeds 0.45%, generation of pearlite and residual γ
(Austenite) is likely to be generated.
【００１６】Ｓｉはベイナイト中フェライト地の強化に
有効で、その含有量が０．１０％未満ではその効果が減
ずる。また、酸化物形成が比較的容易で、Ａｌとの複合
酸化物の形成を助長する元素であるため、０．５０％を
超えるとその影響が顕在化する。したがって、Ｓｉの含
有量は０．１０〜０．５０％とする。[0016] Si is effective for strengthening the ferrite ground in bainite, and if its content is less than 0.10%, its effect is reduced. In addition, since oxide formation is relatively easy and is an element that promotes formation of a composite oxide with Al, the effect becomes apparent when it exceeds 0.50%. Therefore, the content of Si is set to 0.10 to 0.50%.
【００１７】Ｍｎはベイナイトの変態温度を低下させ、
強度の向上に有効な元素で、その含有量が０．３０％に
満たないとその効果を減じる。また、Ｓｉと同様に酸化
物形成が比較的容易で、Ａｌとの複合酸化物の形成を助
長する元素であるため、１．２０％を超えるとその影響
が顕在化する。したがって、Ｍｎの含有量は０．３０〜
１．２０％とする。Mn lowers the transformation temperature of bainite,
It is an element effective for improving the strength. If its content is less than 0.30%, its effect is reduced. Further, like Si, oxide formation is relatively easy, and it is an element that promotes formation of a composite oxide with Al. Therefore, when the content exceeds 1.20%, the effect becomes apparent. Therefore, the content of Mn is 0.30 to
1.20%.
【００１８】Ｃｒもベイナイトの変態温度を低下させ、
強度の向上に有効な元素で、その含有量が０．２０％に
満たないとその効果を減じる。また、３．００％を超え
る添加ではマルテンサイトの生成を招き、レール鋼本来
の耐表面損傷性を損なう。したがって、Ｃｒの含有量は
０．２０〜３．００％とする。Cr also reduces the transformation temperature of bainite,
It is an element effective for improving the strength. If its content is less than 0.20%, its effect is reduced. Further, if the addition exceeds 3.00%, martensite is generated, and the surface damage resistance inherent in rail steel is impaired. Therefore, the content of Cr is set to 0.20 to 3.00%.
【００１９】Ｎについては、本発明の目的とするところ
の、鋼中の微量Ａｌの酸化を防止するための添加であ
る。具体的には、鋼中の微量ＡｌをＡｌＮの析出物とし
て鋼中に固定し、ガス圧接時に酸化ＡｌとＳｉ，Ｍｎな
どの酸化物との低融点複合酸化物生成を阻止する作用を
もつ。N is added to prevent oxidation of a trace amount of Al in steel, which is the object of the present invention. Specifically, it has a function of fixing a small amount of Al in the steel as a precipitate of AlN in the steel and preventing the formation of a low melting point composite oxide of Al oxide and an oxide such as Si or Mn during gas pressure welding.
【００２０】窒化物生成に関しては、Ｆｅ，Ｓｉ，Ｃ
ｒ、あるいは後述するその他の選択元素、特にＮｂやＶ
も炭窒化物として生成の可能性はあるが、生成のための
エネルギーがＡｌに比較して高く、ＡｌＮの生成が選択
的に生ずる。そして、鋼中に不可避的に存在するＡｌの
量、約０．００４％を窒化物として固定するためには少
なくとも０．００６０％に窒素が必要であり、また、
０．０２００％以上ではその効果が減ずるとともに、鋼
溶製上、不安定となる。したがって、Ｎの含有量は０．
００６０〜０．０２００％とする。Regarding nitride formation, Fe, Si, C
r or other optional elements described below, especially Nb or V
Although there is a possibility that carbon dioxide is also produced as carbonitride, the energy for the production is higher than that of Al, and the production of AlN occurs selectively. In order to fix the amount of Al inevitably present in steel, about 0.004%, as nitride, at least 0.0060% of nitrogen is required.
If the content is 0.0200% or more, the effect is reduced, and the steel becomes instable due to melting. Therefore, the content of N is 0.1.
0060 to 0.0200%.
【００２１】以下、必要に応じて添加する元素について
説明する。Ｍｏはベイナイト組織を安定にし、強度向上
に効果のある元素で、含有量が０．０５％未満ではその
効果を発揮できず、１．００％を超えるとマルテンサイ
トの生成を招き、レール鋼本来の耐表面損傷性に有害と
なる。したがって、Ｍｏの含有量は０．０５〜１．００
％とする。Hereinafter, elements to be added as necessary will be described. Mo is an element that stabilizes the bainite structure and is effective in improving the strength. When the content is less than 0.05%, the effect cannot be exhibited. When the content exceeds 1.00%, martensite is generated, and the rail steel is originally formed. Is detrimental to the surface damage resistance. Therefore, the content of Mo is 0.05 to 1.00.
%.
【００２２】Ｃｕ，Ｎｉは延性・靭性を損なわず、強度
の向上に有効な元素であるが、それぞれ０．０５％未満
ではその効果を発揮できず、一方、１．００％を超える
とその効果が飽和する。したがって、Ｃｕ、Ｎｉの含有
量はそれぞれ０．００５〜１．００％とする。Cu and Ni are elements that do not impair ductility and toughness and are effective in improving the strength. However, if their contents are less than 0.05%, their effects cannot be exerted. Saturates. Therefore, the contents of Cu and Ni are each set to 0.005 to 1.00%.
【００２３】Ｎｂ，Ｖは析出効果による強度向上元素で
あるが、Ｎｂ：０．００５％未満、Ｖ：０．０１％未満
ではその効果を発揮できず、一方、Ｎｂ：０．０５％
超、Ｖ：０．２０％超ではその効果が飽和する。したが
って、Ｎｂの含有量は０．００５〜０．０５％、Ｖの含
有量は０．０１〜０．２０％とする。Nb and V are elements that improve the strength due to the precipitation effect. However, if Nb is less than 0.005% and V is less than 0.01%, the effect cannot be exerted. On the other hand, Nb: 0.05%
Exceeding, V: Exceeding 0.20%, the effect is saturated. Therefore, the content of Nb is set to 0.005 to 0.05%, and the content of V is set to 0.01 to 0.20%.
【００２４】Ｔｉは析出効果に加え、組織の細粒化にも
有効な元素で０．００５％以上含有させるが、あまり多
く含有させるとその効果が飽和するため上限を０．０５
０％とする。Ti is an element that is effective not only for the precipitation effect but also for refining the structure and is contained in an amount of 0.005% or more.
0%.
【００２５】Ｂは粒界フェライトの生成を抑え、ベイナ
イト組織を安定に保つ効果を持つため０．０００１％以
上含有させるが、過剰な含有はＢ系の粗大介在物を生じ
せしめ、靭性を劣化させるため、上限を０．００５０％
とする。B is contained in an amount of 0.0001% or more because it has the effect of suppressing the formation of grain boundary ferrite and maintaining the bainite structure in a stable manner. However, excessive B causes the generation of coarse inclusions of the B type and deteriorates toughness. Therefore, the upper limit is 0.0050%
And
【００２６】上記のような成分組成で構成されるレール
鋼は、転炉、電気炉などの通常の溶解炉で溶製し、この
溶鋼を造塊・分塊法あるいは連続鋳造法で鋼片とし、さ
らに熱間圧延法でレールに製造される。The rail steel having the above composition is melted in a conventional melting furnace such as a converter or an electric furnace, and the molten steel is formed into a billet by an ingot-bulking method or a continuous casting method. , And further manufactured into rails by a hot rolling method.
【００２７】[0027]
【実施例】以下に実施例により本発明の効果を具体的に
示す。表１に示す成分組成のレールについて、ガス圧接
を行い評価した。その結果を表２に示す。EXAMPLES The effects of the present invention will be specifically described below with reference to examples. The rails having the component compositions shown in Table 1 were evaluated by gas pressure welding. Table 2 shows the results.
【００２８】ここで、ガス圧接性の評価は、次に述べる
ガス圧接条件にてレール圧接継手を作製し、頭部が引張
となるように２点支持間の距離が１０００mmの３点曲げ
により、接合部を強制破断し、破断面状に低融点酸化物
による欠陥の存在を目視で観察・評価した。Here, the gas pressure welding property was evaluated by preparing a rail pressure welding joint under the gas pressure welding conditions described below, and performing a three-point bending with a distance between two points of support of 1000 mm so that the head becomes tensile. The joint was forcibly fractured, and the presence of defects due to the low melting point oxide was visually observed and evaluated in the fractured surface.
【００２９】ガス圧接はＴＧＰ−ＨＡと称する汎用をガ
ス圧接機を用い、加圧力を６００kgf/cm2 とし、酸素ガ
スは１次圧７．０kgf/cm2 、２次圧５．０kgf/cm2 、流
量１１５l/min.、アセチレンガスは１次圧１．３kgf/cm
2 、２次圧０．６kgf/cm2 、流量１２５l/min.の条件で
行った。[0029] Gas Pressure is using a gas welding machine a generic called TGP-HA, the pressing pressure was 600 kgf / cm 2, oxygen gas primary pressure 7.0kgf / cm 2, 2 primary pressure 5.0 kgf / cm 2 , Flow rate 115 l / min., Acetylene gas primary pressure 1.3 kgf / cm
2 , the secondary pressure was 0.6 kgf / cm 2 and the flow rate was 125 l / min.
【００３０】表１は、供試レールの化学成分である。Ａ
〜Ｆが本発明レール、Ｇ〜Ｉが比較レールである。表２
は、表１の各供試レールについて、上記の条件でガス圧
接を行い、ガス圧接継手の欠陥発生の有無を評価したも
のである。本発明レールは、欠陥が認められなかった。Table 1 shows the chemical components of the test rail. A
F is a rail of the present invention, and GI are comparative rails. Table 2
Table 2 shows the results of gas pressure welding of the test rails in Table 1 under the above conditions, and evaluation of the occurrence of defects in the gas pressure welded joint. No defects were observed in the rail of the present invention.
【００３１】[0031]
【表１】 [Table 1]
【００３２】[0032]
【表２】 [Table 2]
【００３３】[0033]
【発明の効果】本発明により、ガス圧接時に、圧接界面
での低融点酸化物生成による割れを生じる等の、欠陥発
生の生じないベイナイト系レールを提供できる。According to the present invention, it is possible to provide a bainite-based rail which does not cause defects such as cracks due to generation of a low melting point oxide at a pressure interface at the time of gas pressure welding.
Claims (3)
を特徴とするガス圧接性に優れたベイナイト系レール。1. Mass%, C: 0.15 to 0.45, Si: 0.10 to 0.50, Mn: 0.30 to 1.20, Cr: 0.20 to 3.00, N : A bainite-based rail excellent in gas pressure contact, characterized by containing 0.0060 to 0.0200 with the balance being iron and unavoidable impurities.
的不純物からなることを特徴とするガス圧接性に優れた
ベイナイト系レール。2. In mass%, C: 0.15 to 0.45, Si: 0.10 to 0.50, Mn: 0.30 to 1.20, Cr: 0.20 to 3.00, N : 0.0060 to 0.0200, Mo: 0.05 to 1.00, Cu: 0.05 to 1.00, Ni: 0.05 to 1.00, Nb: 0.005 to 0.05, V: 0.01 to 0.20, Ti: 0.005 to 0.05, B: 0.0001 to 0.0050, the balance being iron and unavoidable impurities. A bainite rail with excellent gas pressure contact characteristics.
の低融点酸化物生成による割れを生じないことであるこ
とを特徴とする請求項１または２に記載のガス圧接性に
優れたベイナイト系レール。3. The bainite having excellent gas pressure contact property according to claim 1, wherein the gas pressure contact property is such that cracking due to generation of a low melting point oxide at a pressure contact interface does not occur during gas pressure contact. System rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30262298A JPH11350074A (en) | 1998-04-07 | 1998-10-23 | Bainitic rail excellent in gas-pressure weldability |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-95069 | 1998-04-07 | ||
| JP9506998 | 1998-04-07 | ||
| JP30262298A JPH11350074A (en) | 1998-04-07 | 1998-10-23 | Bainitic rail excellent in gas-pressure weldability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11350074A true JPH11350074A (en) | 1999-12-21 |
Family
ID=26436358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30262298A Withdrawn JPH11350074A (en) | 1998-04-07 | 1998-10-23 | Bainitic rail excellent in gas-pressure weldability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11350074A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6783610B2 (en) * | 2001-03-05 | 2004-08-31 | Amsted Industries Incorporated | Railway wheel alloy |
| CN102191438A (en) * | 2010-03-18 | 2011-09-21 | 宝山钢铁股份有限公司 | Steel plate for seamless high pressure gas cylinder, and manufacture method thereof |
| WO2022253912A1 (en) * | 2021-06-02 | 2022-12-08 | Ascometal France Holding Sas | Hot-formed steel part and manufacturing method |
-
1998
- 1998-10-23 JP JP30262298A patent/JPH11350074A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6783610B2 (en) * | 2001-03-05 | 2004-08-31 | Amsted Industries Incorporated | Railway wheel alloy |
| AU780209B2 (en) * | 2001-03-05 | 2005-03-10 | Amsted Industries Incorporated | Railway wheel alloy |
| CN102191438A (en) * | 2010-03-18 | 2011-09-21 | 宝山钢铁股份有限公司 | Steel plate for seamless high pressure gas cylinder, and manufacture method thereof |
| WO2022253912A1 (en) * | 2021-06-02 | 2022-12-08 | Ascometal France Holding Sas | Hot-formed steel part and manufacturing method |
| FR3123659A1 (en) * | 2021-06-02 | 2022-12-09 | Ascometal France Holding Sas | Hot-formed steel part and method of manufacture |
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| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20060110 |