JPH05279804A - Steel for automobile exhaust manifold - Google Patents
Steel for automobile exhaust manifoldInfo
- Publication number
- JPH05279804A JPH05279804A JP7798792A JP7798792A JPH05279804A JP H05279804 A JPH05279804 A JP H05279804A JP 7798792 A JP7798792 A JP 7798792A JP 7798792 A JP7798792 A JP 7798792A JP H05279804 A JPH05279804 A JP H05279804A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- exhaust manifold
- less
- automobile exhaust
- present
- 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.)
- Withdrawn
Links
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は自動車エギゾーストマニ
ホールド用鋼に関し、さらに詳しくは、自動車のエンジ
ンに取り付けられるエギゾーストマニホールド用として
強度や加工性等に優れ、かつ低コストの鋼に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel for an automobile exhaust manifold, and more particularly to a steel for an exhaust manifold attached to an automobile engine, which is excellent in strength and workability and is low in cost.
【0002】[0002]
【従来の技術】近年、自動車のエギゾーストマニホール
ド(以下エキマニと称する)には、従来の鋳物製エキマ
ニに代えて、ステンレス鋼板製のエキマニが使用される
例が増加している。これはステンレス鋼板製エキマニの
方が肉厚を薄くすることが可能であり、自動車の軽量化
に大きく役立つためである。JISのSUS310等の
オーステナイト系ステンレス鋼は優れた耐熱性および加
工性を有しているので一般の耐熱用途に広く使用されて
いる。しかし、この種の鋼は一般に高価である上に、熱
膨張係数が大きく、熱疲労特性に劣るという難点を有し
ている。2. Description of the Related Art In recent years, an increasing number of exhaust manifolds (hereinafter referred to as "exhaust manifolds") for automobiles are replaced with exhaust manifolds made of stainless steel sheet instead of the conventional exhaust manifolds made of casting. This is because the exhaust manifold made of stainless steel plate can make the wall thickness thinner, which greatly contributes to the weight reduction of the automobile. Austenitic stainless steels such as JIS SUS310 have excellent heat resistance and workability, and are therefore widely used for general heat resistance applications. However, this type of steel is generally expensive, and has a large thermal expansion coefficient, and thus has a drawback of being inferior in thermal fatigue properties.
【0003】一方、フェライト系ステンレス鋼は、一般
にオーステナイトステンレス鋼よりも熱膨張係数が小さ
いので熱疲労特性に優れることから、エギゾーストマニ
ホールドのように加熱・冷却の温度サイクルを受ける用
途には適していると言える。このため、例えば特開昭6
4−8254号公報や特開平2−175843号公報に
はCrを多量に含有し、高温強度を改善したフェライト
系ステンレス鋼が提案されている。しかし、これらのフ
ェライト系ステンレス鋼は非常に高価であり、エキマニ
に使用した場合には鋳物製エキマニに比べてコストが著
しく高いという難点がある。かつ、Crを多量に含有し
ているために加工性がよいとは言えず、エキマニのよう
な複雑な形状を形成するためには、製造工程が複雑にな
り加工コストも高くなるという問題がある。On the other hand, ferritic stainless steels generally have a smaller coefficient of thermal expansion than austenitic stainless steels and are therefore excellent in thermal fatigue characteristics, and are therefore suitable for applications such as exhaust manifolds that undergo a temperature cycle of heating and cooling. Can be said. Therefore, for example, JP-A-6
Japanese Patent Laid-Open No. 4-8254 and Japanese Patent Laid-Open No. 2-175843 propose ferritic stainless steel containing a large amount of Cr and having improved high temperature strength. However, these ferritic stainless steels are very expensive, and when used in an exhaust manifold, there is a drawback that the cost is significantly higher than in a cast exhaust manifold. Further, since it contains a large amount of Cr, it cannot be said that the workability is good, and in order to form a complicated shape such as exhaust manifold, there is a problem that the manufacturing process becomes complicated and the processing cost becomes high. ..
【0004】[0004]
【発明が解決しようとする課題】本発明はこのような現
状の問題点を解消するものであって、強度や加工性等の
特性に優れ、かつ低コストの自動車エンジンに取り付け
られるエギゾーストマニホールド用鋼を提供することを
目的としている。SUMMARY OF THE INVENTION The present invention solves the above problems in the present situation, and is a steel for an exhaust manifold which is excellent in properties such as strength and workability and is attached to a low-cost automobile engine. Is intended to provide.
【0005】[0005]
【課題を解決するための手段】本発明者らは上記の目的
を達成すべく種々検討した結果、Crを従来のエキマニ
用ステンレス鋼とは逆に5.5%以上9.5%以下と比
較的少なくした鋼にMoを添加することによって高温強
度および高温での耐酸化性を大きく改善できること、合
金元素量の範囲を特定の条件を満足するように厳密に制
御すると一段と高温強度が改善されること、を見出し
た。さらに本発明者らは、かかる鋼にWあるいはNbを
添加すると高温強度が一段と向上し、一方、希土類元素
あるいはCaを添加すると、高温での耐酸化性も良くな
ることを見出した。As a result of various investigations to achieve the above object, the present inventors compared Cr with 5.5% or more and 9.5% or less, which is the reverse of the conventional stainless steel for exhaust manifold. The high temperature strength and the oxidation resistance at high temperature can be greatly improved by adding Mo to the steel which has been reduced in quantity, and the high temperature strength is further improved by strictly controlling the range of the amount of alloying elements so as to satisfy the specific conditions. I found that. Furthermore, the present inventors have found that the addition of W or Nb to such steel further improves the high temperature strength, while the addition of rare earth elements or Ca improves the oxidation resistance at high temperatures.
【0006】本発明は主に上記の知見に基づいてなされ
たものであり、その要旨とするところは、重量%で、S
i:0.01%以上1.2%未満、Mn:0.02〜
1.0%、Cr:5.5〜9.5%、Mo:0.9〜
4.0%、Al:0.01〜1.0%、を含有し、Cを
0.03%以下、Pを0.03%以下、Sを0.03%
以下、Nを0.02%以下に低減し、残部Feおよび不
可避不純物からなり、以下の式で与えられるM値 M値=Cr+3Si+4Mo+10Al+1.5W+5
Nb+10Ti+10V−40C−30N−2Mn−4
Ni−Cu が13.0以上であることを特徴とする自動車エギゾー
ストマニホールド用鋼である。上記本発明鋼には付加成
分として、重量%で、W:0.05%〜4.0%、N
b:0.01%〜1.5%の1種または2種を含有させ
ることができ、また本発明は上記した各成分鋼にそれぞ
れ付加成分としてさらに、重量%で、希土類元素:0.
005〜0.1%、Ca:0.001〜0.03%の1
種または2種を含有させることができる。The present invention has been made mainly on the basis of the above findings, and the gist of the present invention is that, in% by weight, S
i: 0.01% or more and less than 1.2%, Mn: 0.02
1.0%, Cr: 5.5 to 9.5%, Mo: 0.9 to
4.0%, Al: 0.01 to 1.0%, C is 0.03% or less, P is 0.03% or less, and S is 0.03%.
Hereinafter, N is reduced to 0.02% or less, the balance is Fe and unavoidable impurities, and the M value is given by the following formula: M value = Cr + 3Si + 4Mo + 10Al + 1.5W + 5
Nb + 10Ti + 10V-40C-30N-2Mn-4
Ni-Cu is 13.0 or more, which is steel for automobile exhaust manifolds. In the above-mentioned steel of the present invention, as an additional component, W: 0.05% to 4.0%, N by weight%
b: 0.01% to 1.5% of 1 type or 2 types can be contained, and in the present invention, each of the above component steels is further added as an additional component by weight% with a rare earth element: 0.
005-0.1%, Ca: 0.001-0.03% of 1
One or two species can be contained.
【0007】[0007]
【作用】以下に本発明において各成分の範囲を限定した
理由を述べる。 Si:SiはCrを5.5%以上含有する鋼に脱酸剤お
よび強化元素としての添加が有効であるが、含有量が
0.01%未満ではその脱酸効果が充分ではなく、1.
2%以上を含有するともはやその効果は飽和しているの
で、含有量範囲を0.01%以上1.2%未満に限定す
る。The reason why the range of each component is limited in the present invention will be described below. Si: Si is effective to be added as a deoxidizing agent and a strengthening element to steel containing 5.5% or more of Cr, but if the content is less than 0.01%, the deoxidizing effect is not sufficient.
Since the effect is already saturated when the content is 2% or more, the content range is limited to 0.01% or more and less than 1.2%.
【0008】Mn:Mnは鋼の脱酸剤として必要で0.
02%以上を含有させる必要があるが、1.0%を超え
て含有させてもその効果はもはや飽和しているばかり
か、過剰にMnを含有させるとフェライト単相組織を確
保することが難しくなるので上限含有量は1.0%とす
る。Mn: Mn is required as a deoxidizing agent for steel,
It is necessary to contain 02% or more, but even if the content exceeds 1.0%, the effect is already saturated, and if Mn is excessively contained, it is difficult to secure a ferrite single-phase structure. Therefore, the upper limit content is 1.0%.
【0009】Cr:Crはエキマニとして必要な耐食
性、耐酸化性を確保するために5.5%以上を含有させ
ることが必要であるが、9.5%を超えて含有させても
いたずらにコストを増すばかりか、加工性が低下するの
で上限含有量は9.5%とする。Cr: Cr is required to be contained in an amount of 5.5% or more in order to secure the corrosion resistance and the oxidation resistance required as exhaust manifold, but even if it exceeds 9.5%, the cost is unnecessarily increased. Not only increases, but also the workability decreases, so the upper limit content is made 9.5%.
【0010】Mo:MoはCrを5.5%以上含有する
鋼に添加してエキマニとして必要な高温強度を確保する
ために0.9%以上を含有させなければならないが、
4.0%を超えて添加してもその効果はもはや飽和する
のに対していたずらにコストを増加させるだけであるか
ら、上記含有量は4.0%とする。Mo: Mo must be added to steel containing 5.5% or more of Cr so as to contain 0.9% or more in order to secure the high temperature strength required as an exhaust manifold.
Even if it is added in excess of 4.0%, its effect will be saturated, but the cost will increase unnecessarily, so the above content is set to 4.0%.
【0011】Al:Alは鋼の脱酸剤として0.01%
以上の添加が必要であるが、1.0%を超えて添加する
と粗大な酸化物系介在物を形成して加工性を低下させる
ので、含有量は0.01〜1.0%に限定する。Al: Al is 0.01% as a deoxidizing agent for steel.
The above-mentioned addition is necessary, but if added in excess of 1.0%, coarse oxide-based inclusions are formed and the workability is reduced, so the content is limited to 0.01-1.0%. ..
【0012】C,N:CはMoと化合物を生成してMo
を析出させ、高温強度を低下させるので、またNは靭性
を低下させるので、CおよびN量は少ない方が望まし
く、エキマニとしての特性を確保するための上限含有量
は、Cは0.03%、Nは0.02%とする。 P:Pは多量に存在すると靭性を低下させるので少ない
方が望ましく、上限含有量は0.03%とする。 S:Sも多量に存在すると熱間加工性および延性を低下
させるので少ない方が望ましく、上限含有量は0.03
%とする。C, N: C forms a compound with Mo to form Mo.
Since N precipitates to lower the high temperature strength and N lowers the toughness, it is preferable that the amount of C and N is small, and the upper limit content for securing the characteristics as exhaust manifold is 0.03% of C. , N is 0.02%. P: If P is present in a large amount, it lowers the toughness, so it is preferable that the content be small, and the upper limit content is made 0.03%. S: If S is present in a large amount, the hot workability and ductility are deteriorated, so it is preferable that the S content is small, and the upper limit content is 0.03.
%.
【0013】さらに本発明では各元素の含有量の組み合
わせとして下記の式で定義されるM値が13.0以上で
あることが必要である。Further, in the present invention, it is necessary that the M value defined by the following formula is 13.0 or more as a combination of the contents of the respective elements.
【0014】M値=Cr+3Si+4Mo+10Al+
1.5W+5Nb+10Ti+10V−40C−30N
−2Mn−4Ni−Cu これは、本発明者らがエキマニとしての特性を得るため
の最適成分組成および組み合わせについて詳細に検討し
た結果に基づく知見であって、M値が13.0未満では
熱処理条件等の如何に制御しても組織をフェライト単相
とすることが困難で、エキマニとして重要な特性である
熱疲労特性が低下するからであり、信頼性の高いエキマ
ニを製造するためにはM値を13.0以上とすることが
重要である。M value = Cr + 3Si + 4Mo + 10Al +
1.5W + 5Nb + 10Ti + 10V-40C-30N
-2Mn-4Ni-Cu This is a finding based on the results of the present inventors' detailed examination of the optimum component composition and combination for obtaining the characteristics as exhaust manifold, and the heat treatment condition when the M value is less than 13.0. This is because it is difficult to make the structure a ferrite single phase regardless of the control such as, and the thermal fatigue property, which is an important property as an exhaust manifold, deteriorates. To produce a highly reliable exhaust manifold, the M value is Is important to be 13.0 or more.
【0015】以上が本発明が対象とする自動車エギゾー
ストマニホールド用鋼の基本成分であるが、本発明にお
いては必要に応じてさらに以下の元素を添加して特性を
一段と向上させた鋼も対象としている。 W:WはCrを5.5%以上含有しMoを0.9%以上
含有する鋼に添加すると、エキマニとして必要な高温強
度を一段と高めるのに効果がある。添加量が0.05%
未満ではその効果が充分発揮されないので、Wの添加効
果を充分に得るためには0.05%以上添加する必要が
あるが、4.0%を超えて添加してもその効果はもはや
飽和するのに対して、いたずらにコストを増加させるだ
けであるから、上限含有量は4.0%とする。The above is the basic composition of the steel for automobile exhaust manifold which is the subject of the present invention, but the present invention is also intended for the steel whose properties are further improved by further adding the following elements as required. .. W: When W is added to steel containing Cr in an amount of 5.5% or more and Mo in an amount of 0.9% or more, it is effective in further increasing the high temperature strength required as an exhaust manifold. Addition amount is 0.05%
If it is less than 4.0%, the effect is not sufficiently exerted, so in order to obtain the sufficient effect of adding W, it is necessary to add it in an amount of 0.05% or more, but even if added in excess of 4.0%, the effect is no longer saturated. On the other hand, since the cost is unnecessarily increased, the upper limit content is set to 4.0%.
【0016】Nb:NbもCrを5.5%以上含有しM
oを0.9%以上含有する鋼に添加すると、エキマニと
して必要な高温強度を一段と高めるのに効果がある。添
加量が0.01%未満ではその効果が充分発揮されない
ので、Nbの添加効果を充分に得るためには0.01%
以上添加する必要があるが、1.5%以上添加してもそ
の効果はもはや飽和するのに対して、いたずらにコスト
を増加させるだけであるから、含有量範囲は0.01%
以上1.5%未満とする。Nb: Nb also contains 5.5% or more of Cr and is M
Adding o to steel containing 0.9% or more is effective in further increasing the high-temperature strength required as an exhaust manifold. If the addition amount is less than 0.01%, the effect is not sufficiently exhibited. Therefore, in order to obtain the sufficient Nb addition effect, 0.01% is required.
Although it is necessary to add more than 1.5%, even if adding 1.5% or more, the effect is no longer saturated, while it only unnecessarily increases the cost, so the content range is 0.01%.
It should be at least 1.5%.
【0017】希土類元素(REM)、Ca:希土類元素
およびCaは熱間加工性の向上、高温での耐酸化性の改
善に効果のある元素であるが、希土類元素では0.00
5%未満、Caでは0.001%未満の含有量ではその
効果が充分ではなく、希土類元素では0.1%を超え
て、Caでは0.03%を超えて添加すると、それぞれ
粗大な非金属介在物を生成して逆に熱間加工性や耐酸化
性を劣化させるので、上限含有量は希土類元素では0.
1%、Caでは0.03%とした。なお、本発明におい
て希土類元素とは原子番号が57〜71番および89〜
103番の元素およびYを指す。Rare earth elements (REM), Ca: Rare earth elements and Ca are elements which are effective in improving hot workability and oxidation resistance at high temperatures, but rare earth elements are 0.00
If the content is less than 5% or less than 0.001% in Ca, the effect is not sufficient. Since inclusions are formed and conversely deteriorate the hot workability and oxidation resistance, the upper limit content of the rare earth element is 0.
1% and Ca of 0.03%. In the present invention, the rare earth element has an atomic number of 57 to 71 and 89 to
It refers to element 103 and Y.
【0018】本発明の鋼においては上記の成分の他にス
クラップ等から混入不純物として、あるいは靭性や加工
性等を調整する目的でTi,V,Ni,Cu等を含有す
ることができるが、その場合にも特許請求の範囲で規定
したM値が13.0以上であることが必要であるのは言
うまでもない。The steel of the present invention may contain Ti, V, Ni, Cu and the like in addition to the above components as impurities mixed from scraps or the like, or for the purpose of adjusting toughness, workability and the like. Needless to say, the M value specified in the claims should be 13.0 or more.
【0019】本発明において提案する鋼は、エキマニと
して使用するに際して鋼板として製造した後に、鋼板を
プレス成形し、さらに加工・溶接してエキマニとして製
造しても良いし、鋼板を例えば電縫鋼管等としてまず鋼
管の形状にした後に2次加工および溶接等によってエキ
マニに加工しても良く、その他のプロセスも含めて本発
明で限定する組成および元素の組み合わせを有する鋼
は、いずれも本発明の対象とするところであって、コス
トや既存製造設備の制約等によって最適なエキマニ製造
工程を選択することができ、どのエキマニ製造工程を選
択したとしてもそれをもって本発明の範囲を逸脱するも
のではない。The steel proposed in the present invention may be manufactured as a steel sheet after being manufactured as a steel sheet for use as an exhaust manifold, and then press-formed and further processed / welded to produce an exhaust manifold. First, the steel pipe may be formed into a shape and then processed into an exhaust manifold by secondary processing, welding, etc., and any steel having a composition and a combination of elements limited by the present invention including other processes is the object of the present invention. However, the optimum exhaust manifold manufacturing process can be selected depending on the cost, constraints of the existing manufacturing equipment, and the like, and whichever exhaust manifold manufacturing process is selected does not depart from the scope of the present invention.
【0020】[0020]
【実施例】以下に本発明の実施例について説明する。表
1に成分を示す鋼を溶製し、通常の熱間圧延工程によっ
て肉厚2mmの鋼板とし、950℃にて焼鈍を施した。次
にこれらの鋼板から試験片を採取して高温(800℃)
における引張試験と高温酸化試験を実施した。また、最
高加熱温度を800℃とする熱疲労試験も実施した。試
験結果を表1にあわせて示す。ここで表1の高温引張試
験結果において、○は800℃における0.2%耐力が
エキマニとして必要な強度である20N/mm2 以上であ
ったことを示し、×は20N/mm2 未満であったことを
示す。また、高温酸化試験結果において、○は800℃
における酸化増量が0.01g/m2/hr以下であった
ことを示し、×は酸化増量が0.01g/m2 /hrより
大きかったことを示している。さらに、熱疲労試験結果
において、○は破断に至るまでの繰り返し数が500回
以上であったことを示し、×は繰り返し数が500回未
満であったことを示している。EXAMPLES Examples of the present invention will be described below. Steels having the components shown in Table 1 were melted and made into a steel plate having a thickness of 2 mm by an ordinary hot rolling process, and annealed at 950 ° C. Next, test pieces are taken from these steel plates and subjected to high temperature (800 ° C)
The tensile test and the high temperature oxidation test were conducted. Further, a thermal fatigue test in which the maximum heating temperature was 800 ° C was also carried out. The test results are also shown in Table 1. Here, in the high temperature tensile test results of Table 1, ◯ indicates that the 0.2% proof stress at 800 ° C. was 20 N / mm 2 or more, which is the strength required as an exhaust manifold, and × was less than 20 N / mm 2. Indicates that In addition, in the high temperature oxidation test result, ○ indicates 800 ° C.
Shows that the increase in oxidation was less than or equal to 0.01 g / m 2 / hr, and x indicates that the increase in oxidation was greater than 0.01 g / m 2 / hr. Furthermore, in the thermal fatigue test results, ◯ indicates that the number of repetitions up to fracture was 500 or more, and x indicates that the number of repetitions was less than 500.
【0021】[0021]
【表1】 [Table 1]
【0022】表1から明らかなように、本発明鋼である
No.1〜7は高温強度、耐酸化性および耐熱疲労特性に
優れているのに対して、比較例であるNo.8〜10は高
温強度、高温での耐酸化性あるいは耐熱疲労特性に劣る
ことがわかる。As is clear from Table 1, the steel of the present invention is
No. Nos. 1 to 7 which are comparative examples are excellent in high temperature strength, oxidation resistance and heat fatigue resistance. It can be seen that 8 to 10 are inferior in high temperature strength, high temperature oxidation resistance or heat fatigue resistance.
【0023】[0023]
【発明の効果】以上述べたように、本発明は自動車エギ
ゾーストマニホールド用鋼として高温強度および高温で
の耐酸化性に優れる鋼を低コストで提供することを可能
としたものであり、産業の発展に貢献するところ極めて
大である。INDUSTRIAL APPLICABILITY As described above, the present invention makes it possible to provide, at a low cost, steel having excellent high-temperature strength and oxidation resistance at high temperatures as steel for automobile exhaust manifolds. It is extremely large that it contributes to.
Claims (3)
の式で与えられるM値 M値=Cr+3Si+4Mo+10Al+1.5W+5
Nb+10Ti+10V−40C−30N−2Mn−4
Ni−Cu が13.0以上であることを特徴とする自動車エギゾー
ストマニホールド用鋼。1. By weight%, Si: 0.01% or more and less than 1.2%, Mn: 0.02-1.0%, Cr: 5.5-9.5%, Mo: 0.9- 4.0%, Al: 0.01 to 1.0%, C is 0.03% or less, P is 0.03% or less, S is 0.03% or less, N is 0.02%. The M value which is reduced to the following and consists of the balance Fe and unavoidable impurities, and is given by the following formula: M value = Cr + 3Si + 4Mo + 10Al + 1.5W + 5
Nb + 10Ti + 10V-40C-30N-2Mn-4
Ni-Cu is 13.0 or more, steel for automobile exhaust manifolds.
て、重量%で、 W :0.05%〜4.0%、 Nb:0.01%以上1.5%未満、 の1種または2種を含有することを特徴とする自動車エ
ギゾーストマニホールド用鋼。2. As an additive component to the component steel according to claim 1, W: 0.05% to 4.0%, Nb: 0.01% or more and less than 1.5%, or 1% by weight, or Steel for automobile exhaust manifolds, characterized by containing two kinds.
分としてさらに、重量%で、 希土類元素:0.005〜0.1%、 Ca:0.001〜0.03%、 の1種または2種を含有することを特徴とする自動車エ
ギゾーストマニホールド用鋼。3. One of the constituent steels according to claims 1 and 2, further comprising, as an additional component, by weight, a rare earth element: 0.005-0.1%, Ca: 0.001-0.03%. Or steel for automobile exhaust manifolds, characterized by containing two kinds.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7798792A JPH05279804A (en) | 1992-03-31 | 1992-03-31 | Steel for automobile exhaust manifold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7798792A JPH05279804A (en) | 1992-03-31 | 1992-03-31 | Steel for automobile exhaust manifold |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05279804A true JPH05279804A (en) | 1993-10-26 |
Family
ID=13649206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7798792A Withdrawn JPH05279804A (en) | 1992-03-31 | 1992-03-31 | Steel for automobile exhaust manifold |
Country Status (1)
Country | Link |
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JP (1) | JPH05279804A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114000047A (en) * | 2021-09-28 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon high-chromium steel plate blank and continuous efficient production method thereof |
-
1992
- 1992-03-31 JP JP7798792A patent/JPH05279804A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114000047A (en) * | 2021-09-28 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon high-chromium steel plate blank and continuous efficient production method thereof |
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