JP2008063597A - HIGH Ni-Cr-CONTAINING AUSTENITIC STAINLESS STEEL WIRE ROD - Google Patents

HIGH Ni-Cr-CONTAINING AUSTENITIC STAINLESS STEEL WIRE ROD Download PDF

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JP2008063597A
JP2008063597A JP2006239670A JP2006239670A JP2008063597A JP 2008063597 A JP2008063597 A JP 2008063597A JP 2006239670 A JP2006239670 A JP 2006239670A JP 2006239670 A JP2006239670 A JP 2006239670A JP 2008063597 A JP2008063597 A JP 2008063597A
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stainless steel
austenitic stainless
steel wire
breakage
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JP5005298B2 (en
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Yoshinori Tada
好宣 多田
Koji Takano
光司 高野
Yuji Mori
祐司 森
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Nippon Steel & Sumikin Stainless Steel Corp
新日鐵住金ステンレス株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a high Ni-Cr-containing austenitic stainless steel wire rod having conflicting characteristics of the reduction in Ni and the lowering of strength in high Ni-containing steel kinds such as SUS310S, and in which breakage is hard to be generated upon rope manufacturing. <P>SOLUTION: The high Ni-Cr-containing austenitic stainless steel wire rod has a composition comprising, by mass, 0.01 to 0.05% C, 0.1 to 1.0% Si, 1.0 to 2.5% Mn, 19.0 to 20.0% Ni, 24.0 to 25.0% Cr, 0.1 to 1.0% Cu and 0.02 to 0.08% N, and the balance Fe with inevitable impurities, and whose breakage index upon rope manufacturing satisfies inequality (A): 0.328(C+N)-0.0028Ni+0.0415Cr≤1.0. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は高Ni,Cr含有オーステナイト系ステンレス鋼線材に関する。   The present invention relates to a high Ni, Cr containing austenitic stainless steel wire.
SUS310Sなどの高Ni含有鋼種はNi原料高騰によるコスト上昇代が大きいため、規格範囲内での原料コスト低減(省Ni化)が望まれている。   High Ni-containing steel grades such as SUS310S have a large cost increase due to soaring Ni raw materials, and therefore it is desired to reduce raw material costs within the standard range (reduction in Ni).
しかし、省Ni化は高強度化を招くため、製綱加工時に折損が発生しやすいという問題点があった。   However, since Ni saving leads to high strength, there has been a problem that breakage is likely to occur during steelmaking.
また、高Cr含有鋼種は、熱処理時に炭化物が析出しやすく、製綱加工時に炭化物による折損が発生しやすいこと、及び耐食性が劣化するため、炭化物の析出を抑制する成分調整とする必要があった。   In addition, the high Cr content steel type is easy to precipitate carbide during heat treatment, easily breakage due to carbide during steelmaking, and deteriorated corrosion resistance, it was necessary to adjust the component to suppress the precipitation of carbide. .
従って、原料コスト低減のための省Ni化に合わせ、コストアッフ゜しない方法で折損の改善を図る必要があった。   Therefore, it is necessary to improve breakage by a method that does not increase the cost in accordance with Ni saving for reducing the raw material cost.
高Ni,Cr含有オーステナイト系ステンレス鋼に関しては従来から種々の提案がなされており、例えば特開2005-23357号公報(下記特許文献1)には、Ni:8〜30%、Cr:15〜30%を含有する溶接施工性に優れたステンレス鋼が記載されている。   Various proposals have heretofore been made for high Ni, Cr-containing austenitic stainless steels. For example, Japanese Patent Laid-Open No. 2005-23357 (the following Patent Document 1) describes Ni: 8 to 30%, Cr: 15 to 30 Stainless steel excellent in welding workability and containing 20% is described.
しかし、この特許文献1は、溶接金属のフェライト組織率とCuとの関係式を規定することにより溶接施工性を向上させたものであり、製綱加工時の折損等については検討されていなかった。   However, this Patent Document 1 improves welding workability by defining a relational expression between the ferrite structure ratio of weld metal and Cu, and has not been studied for breakage during steelmaking. .
このように、SUS310Sなどの高Ni含有鋼種において省Niと低強度化の相反する特性を有し製綱加工時に折損が発生しにくい鋼線は実現されていなかった。
特開2005-23357号公報
As described above, a steel wire having high Ni-containing steel grades such as SUS310S, which has contradictory characteristics of Ni saving and low strength, and is less likely to break during steel forming processing has not been realized.
Japanese Unexamined Patent Publication No. 2005-23357
そこで本発明は、前述のような従来技術の問題点を解決し、SUS310Sなどの高Ni含有鋼種において省Niと低強度化の相反する特性を有有し製綱加工時に折損が発生しにくい高Ni,Cr含有オーステナイト系ステンレス鋼線材を提供することを課題とする。   Accordingly, the present invention solves the problems of the prior art as described above, and has high Ni-containing steel grades such as SUS310S, which have contradictory characteristics of Ni saving and low strength, and is less likely to break during steelmaking. It is an object to provide a Ni, Cr-containing austenitic stainless steel wire.
本発明は、前述の課題を解決するため省Niと低強度化の双方を満足する成分系について鋭意検討の結果なされたものであり、その要旨とするところは特許請求の範囲に記載した通りの下記内容である。
(1)質量%で、
C;0.001〜0.05%、
Si;0.1〜1.0%、
Mn;1.0〜2.5%、
Ni;19.0〜20.0%、
Cr;24.0〜25.0%、
Cu;0.01〜1.0%、
N;0.02〜0.08%を含有し、残部Feおよび不可避的不純物からなり、
製綱加工時の折損指数が下記(A)式を満足することを特徴とする高Ni,Cr含有オーステナイト系ステンレス鋼線材。
In order to solve the above-mentioned problems, the present invention has been made as a result of intensive studies on a component system that satisfies both Ni saving and low strength, and the gist of the present invention is as described in the claims. The contents are as follows.
(1) In mass%,
C; 0.001 to 0.05%,
Si: 0.1 to 1.0%,
Mn: 1.0-2.5%
Ni; 19.0 to 20.0%,
Cr: 24.0 to 25.0%,
Cu; 0.01 to 1.0%,
N; containing 0.02 to 0.08%, consisting of the balance Fe and inevitable impurities,
A high Ni, Cr-containing austenitic stainless steel wire characterized by a breakage index at the time of steelmaking satisfying the following formula (A).
0.328(C+N)-0.0028Ni+0.0415Cr≦1.0・・・(A)
(2)さらに、質量%で、B;0.001〜0.01%を含有することを特徴とする(1)に記載の高Ni,Cr含有オーステナイト系ステンレス鋼線材。
(3)金属組織が段状組織または混合組織であることを特徴とする(1)または(2)に記載の高Ni,Cr含有オーステナイト系ステンレス鋼線材。
0.328 (C + N) -0.0028Ni + 0.0415Cr≤1.0 ... (A)
(2) The high Ni, Cr-containing austenitic stainless steel wire according to (1), further containing B; 0.001 to 0.01% by mass.
(3) The high Ni, Cr-containing austenitic stainless steel wire according to (1) or (2), wherein the metal structure is a stepped structure or a mixed structure.
本発明によれば、SUS310Sなどの高Ni含有鋼種において、C、Crなどの成分範囲を工夫することにより、省Niと低強度化の相反する特性を有有し製綱加工時に折損が発生しにくい高Ni,Cr含有オーステナイト系ステンレス鋼線材を提供することができるなど、産業上有用な著しい効果を奏する。   According to the present invention, in a high Ni content steel grade such as SUS310S, by devising the component range of C, Cr, etc., there is a contradictory characteristic of Ni saving and low strength, and breakage occurs during steelmaking processing. It is possible to provide an austenitic stainless steel wire containing a high Ni, Cr content that is difficult to achieve, and has remarkable industrially useful effects.
以下に本発明を実施するための最良の実施形態について詳細に説明する。   The best mode for carrying out the present invention will be described in detail below.
まず、本発明の技術思想を説明する。   First, the technical idea of the present invention will be described.
Ni原料の高騰により、オーステナイト系ステンレス鋼、特にSUS310Sなどの高Ni含有鋼種は原料コストの上昇代が大きく、規格範囲内での省Ni化による原料コスト低減が望まれている。   Due to soaring Ni raw materials, high Ni-containing steel types such as austenitic stainless steel, especially SUS310S, have a large cost of raw material costs, and it is desired to reduce raw material costs by reducing Ni within the standard range.
しかし、省Ni化は高強度化を招き、客先での製綱加工時に折損が発生するため単純な省Ni化は一般的に受け入れられない。   However, Ni-saving leads to high strength, and breakage occurs at the time of steelmaking at the customer, so simple Ni-saving is not generally accepted.
従って、省Ni化に合わせて折損性の改善を進めなければならない。   Therefore, breakage must be improved in accordance with Ni saving.
折損性の改善の方法として、1)成分調整、2)熱処理高温・長時間化が考えられるが、2)は熱処理条件の高温・長時間化により確実にコストアッフ゜を招くため、採用できない。   As a method of improving breakability, 1) component adjustment and 2) high temperature and long time for heat treatment are conceivable, but 2) cannot be adopted because it will surely increase the cost due to high temperature and long time for heat treatment conditions.
そこで、本発明者等は、1)成分調整でコストアッフ゜が少ない元素量を調整することによって折損性の改善を図ることとした。   Therefore, the present inventors decided to improve breakability by adjusting the amount of element with a small cost increase by 1) component adjustment.
一方、高Cr含有鋼種では、高温からの冷却時に炭化物が析出しやすく、耐食性の問題が発生しやすいため、解決を図る必要があるが、急冷可能なストラント゛熱処理ではコストアッフ゜代が大きいため、コストアッフ゜が少ない成分調整方法を採用する必要がある。   On the other hand, with high Cr steel grades, carbides are likely to precipitate during cooling from high temperatures, and problems with corrosion resistance are likely to occur. Therefore, it is necessary to solve the problem, but the cost of the heat treatment that can be rapidly cooled is large, so the cost increases. It is necessary to adopt a component adjustment method with a small increase.
コストアッフ゜が少ない成分調整方法としては、Cを低減することによる低強度化に加え、熱処理時の炭化物析出抑制効果を奏するためにCを0.01〜0.05%に規制することを見出した。   As a component adjustment method with a low cost increase, in addition to lowering the strength by reducing C, it has been found that C is restricted to 0.01 to 0.05% in order to exhibit the effect of suppressing carbide precipitation during heat treatment. .
また、低強度化には、Cr低減を行い、更に省コスト化を図った。Crの固溶強化程度はSUS304では一般的に小さく、効果的ではないが、本発明のような高合金ではCr固溶強化効果が非常に大きいことを見出し、強度低減に利用した。   In order to reduce the strength, Cr was reduced to further reduce costs. The degree of solid solution strengthening of Cr is generally small in SUS304 and is not effective, but a high alloy such as the present invention has found that the effect of Cr solid solution strengthening is very large and was used for strength reduction.
即ち、本発明は、質量%で、
C;0.001〜0.05%、
Si;0.1〜1.0%、
Mn;1.0〜2.5%、
Ni;19.0〜20.0%、
Cr;24.0〜25.0%、
Cu;0.01〜1.0%、
N;0.02〜0.08%を含有し、残部Feおよび不可避的不純物からなり、
製綱加工時の折損指数が下記(A)式を満足することを特徴とする。
That is, the present invention is mass%,
C; 0.001 to 0.05%,
Si: 0.1 to 1.0%,
Mn: 1.0-2.5%
Ni; 19.0 to 20.0%,
Cr: 24.0 to 25.0%,
Cu; 0.01 to 1.0%,
N; containing 0.02 to 0.08%, consisting of the balance Fe and inevitable impurities,
The breakage index at the time of steelmaking satisfies the following formula (A).
0.328(C+N)-0.0028Ni+0.0415Cr≦1.0・・・(A)
なお、(A)式のC、N、Ni、Crは各成分の質量%を示す。
0.328 (C + N) -0.0028Ni + 0.0415Cr≤1.0 ... (A)
In the formula (A), C, N, Ni, and Cr represent mass% of each component.
以下に各成分の限定理由を説明する。   The reason for limitation of each component is demonstrated below.
C:Cは、ステンレス鋼の耐食性に有害であるが、低強度化と炭化物析出抑制の両方に効果があるため、0.001〜0.05%の範囲とした。なお、Cの好ましい範囲は、0.001〜0.03%である。   C: Although C is harmful to the corrosion resistance of stainless steel, it is effective for both strength reduction and carbide precipitation suppression. In addition, the preferable range of C is 0.001 to 0.03%.
Si:Siはステンレス鋼の脱酸元素として0.1%以上添加するが、過剰な添加は熱間加工性を劣化させ、表面疵発生の頻度を増加させるので1.0%以下で添加する。なお、Siの好ましい範囲は、0.3〜0.8%である。   Si: Si is added in an amount of 0.1% or more as a deoxidizing element for stainless steel. However, excessive addition deteriorates hot workability and increases the frequency of occurrence of surface defects, so it is added at 1.0% or less. In addition, the preferable range of Si is 0.3 to 0.8%.
Mn:Mnはγ安定化元素であり、Niの代替として添加することが可能であり、脱酸効果もあるので1.0%以上添加するが、過剰に添加すると耐食性が劣化するため2.5%以下で添加する。なお、Mnの好ましい範囲は、1.0〜1.5%である。   Mn: Mn is a γ-stabilizing element and can be added as a substitute for Ni and has a deoxidizing effect. Therefore, 1.0% or more is added. % Or less. In addition, the preferable range of Mn is 1.0 to 1.5%.
Ni:NiはCrとともにステンレス鋼の基本成分であり、本発明では合金コストを低減するため19.0〜20.0%の範囲で添加する。なお、Niの好ましい範囲は、19.0〜19.5%である。   Ni: Ni is a basic component of stainless steel together with Cr. In the present invention, Ni is added in the range of 19.0 to 20.0% in order to reduce alloy costs. In addition, the preferable range of Ni is 19.0 to 19.5%.
Cr:Crはステンレス鋼の基本成分であり、耐食性の点から添加されるが、本発明者等は、高Ni鋼種ではCrの固溶強化程度が大きいことを見出し、Crを24.0〜25.0%の範囲まで低減することにより、低強度化を図るとともに炭化物の析出を抑制する。なお、Crの好ましい範囲は、24.0〜24.5%である。   Cr: Cr is a basic component of stainless steel and is added from the viewpoint of corrosion resistance. However, the present inventors have found that a high Ni steel grade has a large degree of solid solution strengthening of Cr, and Cr is 24.0-25. By reducing it to the range of 0.0%, the strength is reduced and the precipitation of carbides is suppressed. In addition, the preferable range of Cr is 24.0 to 24.5%.
Cu:Cuはステンレス鋼の耐食性を向上させるので、0.1%以上で添加する。しかし1.0を超えて添加しても、その効果は飽和するため、その添加範囲を0.01〜1.0%とする。なお、Cuの好ましい範囲は、0.01〜0.5%である。   Cu: Since Cu improves the corrosion resistance of stainless steel, it is added at 0.1% or more. However, even if added over 1.0, the effect is saturated, so the range of addition is 0.01-1.0%. In addition, the preferable range of Cu is 0.01 to 0.5%.
N:Nの含有量が多いと鋼組織が固くなって熱間加工性が悪くなるので、0.08%以下とする。また、Nの下限を0.02%未満にすることは溶製コストを増加させるため0.02%以上とする。   N: If the content of N is large, the steel structure becomes hard and the hot workability deteriorates, so the content is made 0.08% or less. Moreover, since making the minimum of N less than 0.02% increases melting cost, it is made 0.02% or more.
さらに、選択元素として、質量%で、B;0.001〜0.01%を含有することが好ましい。Bはオーステナイト系高合金において、熱間加工性を改善するために添加される。0.001%以下では効果が乏しく、0.01%以上では粒界にBの化合物が析出して熱間加工性に有害になるため0.001〜0.01%とした。なお、Bの好ましい範囲は、0.003〜0.008%である。   Furthermore, it is preferable to contain B; 0.001 to 0.01% by mass% as a selective element. B is added in order to improve hot workability in an austenitic high alloy. If it is 0.001% or less, the effect is poor, and if it is 0.01% or more, the B compound precipitates at the grain boundary and is detrimental to hot workability. In addition, the preferable range of B is 0.003 to 0.008%.
また、上記 (A)式に示す折損指数が≦1.0を満足すれば省Ni化可能になるため、例えば、TYPE310の成分規格内でコストパフォーマンスを上げることができる。   Further, Ni can be saved if the breakage index shown in the above formula (A) satisfies ≦ 1.0. For example, cost performance can be improved within the component specification of TYPE310.
本発明においては上記以外の成分については規定しないが下記の成分を添加してもよい。   In the present invention, components other than those described above are not specified, but the following components may be added.
Mo:Moは耐食性を確保するための重要な添加元素であり、0.01%以上の添加で効果がみられる。しかし、高価な元素であるため、上限を4%とすることが好ましい。   Mo: Mo is an important additive element for ensuring corrosion resistance, and an effect is seen with addition of 0.01% or more. However, since it is an expensive element, the upper limit is preferably 4%.
S:Sは、熱間加工性を悪化させるため、極力低減することが望ましく、その成分範囲を0.010%以下とすることが好ましい。   S: Since S deteriorates hot workability, it is desirable to reduce it as much as possible, and it is preferable to make the component range 0.010% or less.
P:Pは耐食性及び熱間加工性の観点から有害な元素であり、特に鋳造直後の延性を劣化させるため鋳片表層の割れ防止の観点から極力低減することが望ましく、その成分範囲を0.040%以下とすることが好ましい。
なお、上記成分以外の残部は鉄および不可避的不純物からなる。
P: P is a harmful element from the viewpoint of corrosion resistance and hot workability. In particular, in order to deteriorate ductility immediately after casting, it is desirable to reduce it as much as possible from the viewpoint of preventing cracks on the surface of the slab. It is preferable to set it to 040% or less.
The balance other than the above components consists of iron and inevitable impurities.
本発明の実施例として表1に発明例A〜L、比較例1〜11で示す合金からなる線材について(A)式により計算される折損指数と金属組織を示す。   Table 1 shows the breakage index and metal structure calculated by the formula (A) for the wires made of the alloys shown in Invention Examples A to L and Comparative Examples 1 to 11 as examples of the present invention.
表1において、金属組織は、熱処理後の組織がJIS G 0571に規定する段状組織または混合組織の場合を○、みぞ状組織の場合を×とした。   In Table 1, as for the metal structure, a case where the structure after heat treatment is a stepped structure or a mixed structure specified in JIS G 0571 is marked with ◯, and a case where it is a grooved structure is marked with ×.
本発明法によるA〜L鋼は折損指数、製綱加工時の折損有無および金属組織とも良好な特性を示すことが確認された。   It was confirmed that the A to L steels according to the method of the present invention show good characteristics both in the breakage index, in the presence or absence of breakage during steelmaking and in the metal structure.
一方、比較鋼1〜11は、鋼中のCまたはCrが本発明の範囲から外れているため、折損指数が1.0を超えており製綱加工時の折損が有り、6〜11については金属組織も×だった。   On the other hand, in Comparative Steels 1 to 11, C or Cr in the steel is out of the scope of the present invention, so the breakage index exceeds 1.0, and there is breakage during steelmaking. The metal structure was also x.
以上の実施例により、本発明の効果が明らかになった。   The effects of the present invention have been clarified by the above examples.

Claims (3)

  1. 質量%で、
    C;0.001〜0.05%、
    Si;0.1〜1.0%、
    Mn;1.0〜2.5%、
    Ni;19.0〜20.0%、
    Cr;24.0〜25.0%、
    Cu;0.01〜1.0%、
    N;0.02〜0.08%を含有し、残部Feおよび不可避的不純物からなり、
    製綱加工時の折損指数が下記(A)式を満足することを特徴とする高Ni,Cr含有オーステナイト系ステンレス鋼線材。
    0.328(C+N)-0.0028Ni+0.0415Cr≦1.0・・・(A)
    % By mass
    C; 0.001 to 0.05%,
    Si: 0.1 to 1.0%,
    Mn: 1.0-2.5%
    Ni; 19.0 to 20.0%,
    Cr: 24.0 to 25.0%,
    Cu; 0.01 to 1.0%,
    N; containing 0.02 to 0.08%, consisting of the balance Fe and inevitable impurities,
    A high Ni, Cr-containing austenitic stainless steel wire characterized by a breakage index at the time of steelmaking satisfying the following formula (A).
    0.328 (C + N) -0.0028Ni + 0.0415Cr≤1.0 ... (A)
  2. さらに、質量%で、
    B;0.001〜0.01%を含有することを特徴とする請求項1に記載の高Ni,Cr含有オーステナイト系ステンレス鋼線材。
    Furthermore, in mass%,
    B: 0.001-0.01% is contained, The high Ni and Cr containing austenitic stainless steel wire rod of Claim 1 characterized by the above-mentioned.
  3. 金属組織が段状組織または混合組織であることを特徴とする請求項1または請求項2に記載の高Ni,Cr含有オーステナイト系ステンレス鋼線材。
    3. The high Ni, Cr-containing austenitic stainless steel wire according to claim 1, wherein the metal structure is a stepped structure or a mixed structure.
JP2006239670A 2006-09-05 2006-09-05 High Ni, Cr containing austenitic stainless steel wire Active JP5005298B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6369950A (en) * 1986-09-09 1988-03-30 Kawasaki Steel Corp Nonmagnetic austenitic stainless steel having high hardness
JPH0361322A (en) * 1989-07-28 1991-03-18 Nippon Steel Corp Production of austenitic stainless steel excellent in drawability and cold rollability
JPH07157851A (en) * 1994-06-07 1995-06-20 Nippon Yakin Kogyo Co Ltd Corrosion resistant austenitic stainless steel excellent in hot workability
JP2002206149A (en) * 2001-12-04 2002-07-26 Nippon Yakin Kogyo Co Ltd Austenitic stainless steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6369950A (en) * 1986-09-09 1988-03-30 Kawasaki Steel Corp Nonmagnetic austenitic stainless steel having high hardness
JPH0361322A (en) * 1989-07-28 1991-03-18 Nippon Steel Corp Production of austenitic stainless steel excellent in drawability and cold rollability
JPH07157851A (en) * 1994-06-07 1995-06-20 Nippon Yakin Kogyo Co Ltd Corrosion resistant austenitic stainless steel excellent in hot workability
JP2002206149A (en) * 2001-12-04 2002-07-26 Nippon Yakin Kogyo Co Ltd Austenitic stainless steel

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