JPH04318153A - High cold forgeability electric stainless steel - Google Patents

High cold forgeability electric stainless steel

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Publication number
JPH04318153A
JPH04318153A JP10831591A JP10831591A JPH04318153A JP H04318153 A JPH04318153 A JP H04318153A JP 10831591 A JP10831591 A JP 10831591A JP 10831591 A JP10831591 A JP 10831591A JP H04318153 A JPH04318153 A JP H04318153A
Authority
JP
Japan
Prior art keywords
less
magnetic properties
steel
cold
stainless steel
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
Application number
JP10831591A
Other languages
Japanese (ja)
Other versions
JP3197573B2 (en
Inventor
Yoshinobu Saito
吉信 斎藤
Susumu Shinagawa
丞 品川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku Tokushuko KK
Tohoku Steel Co Ltd
Original Assignee
Tohoku Tokushuko KK
Tohoku Steel Co Ltd
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Filing date
Publication date
Application filed by Tohoku Tokushuko KK, Tohoku Steel Co Ltd filed Critical Tohoku Tokushuko KK
Priority to JP10831591A priority Critical patent/JP3197573B2/en
Publication of JPH04318153A publication Critical patent/JPH04318153A/en
Application granted granted Critical
Publication of JP3197573B2 publication Critical patent/JP3197573B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To restrict formation of coarse grain and to improve cold forgeability of ferritic electric stainless steel by compositely adding specified quantity of Ti, B Mo and Cu to the above steel. CONSTITUTION:This steel consists of <=0.02wt.% C, 0.01-0.05% Si, 0.01-0.50% Mn, 7.00-20.00% Cr, 0.30-2.00% Mo, 0.01-2.00% Cu, 0.05-0.50% Ti, 0.05-3.00% Al, 0.0005-0.05% B, <=0.05% Ni and residue substantially consisting of Fe. Moreover, if necessary, at least a kind of <=1.00% Nb, 1.00% V, moreover at least one kind of <=0.30% Pb, <=0.03% Ca, <=0.20% Se and <=0.20% S is allowed to contain. As crystal grains become fine and have uniform structure in this component, high cold forgeability electric stainless steel having all of excellent cold forge-ability, favorable magnetic characteristics and corrosion resistance can be obtained.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】この発明は、優れた冷鍛性および
耐食性を有し、かつ良好な軟磁気特性を兼ね備える高冷
鍛電磁ステンレス鋼に関し、とくに自動車用電子制御燃
料噴射装置のハウジング材やスリーブ、コア用材料、各
種センサーおよび水用電磁弁等に用いて好適な合金であ
る。
[Industrial Application Field] The present invention relates to high-cold forged electromagnetic stainless steel that has excellent cold forging properties and corrosion resistance as well as good soft magnetic properties, and is particularly used as a housing material for electronically controlled fuel injection devices for automobiles. This alloy is suitable for use in sleeves, core materials, various sensors, water solenoid valves, etc.

【0002】0002

【従来の技術】自動車用電子制御燃料噴射装置は、カー
エレクトロニクスの急速な開発に伴いその積載車両は大
幅に増加しているが、その材料としては、耐食性や軟磁
気特性の要求から13Cr−1Si−Al系のフェライ
ト系電磁ステンレス鋼が実用材として多用されている。
[Prior Art] With the rapid development of car electronics, the number of vehicles equipped with electronically controlled fuel injection systems for automobiles has increased significantly, but the material used for them is 13Cr-1Si due to the requirements for corrosion resistance and soft magnetic properties. -Al-based ferritic electromagnetic stainless steel is widely used as a practical material.

【0003】これらの部品は、加工費用の低減のため、
切削加工から冷鍛加工に移行しつつあり、とくに全冷鍛
による部品加工が指向されている。かかる要求の下に、
13Cr−1Si−Al合金の(C+N)を低減し、冷
鍛性の向上が試みられてきた。しかしながら自動車用電
子制御燃料噴射装置の部品形状は非常に複雑なため、低
(C+N)としても現状の13Cr−1Si−Al合金
では十分とはいえない。
[0003] In order to reduce processing costs, these parts are
There is a shift from cutting to cold forging, and in particular, parts machining by completely cold forging is becoming more popular. Under such a request,
Attempts have been made to reduce (C+N) in 13Cr-1Si-Al alloys and improve cold forgeability. However, since the shape of the parts of electronically controlled fuel injection devices for automobiles is very complicated, the current 13Cr-1Si-Al alloy is not sufficient even if it has a low (C+N).

【0004】一方、自動車用燃料の多角化により、アル
コール燃料の利用が本格的に検討され、アルコールの酸
化による、酢酸や蟻酸等の有機酸の発生に伴う腐食の発
生が懸念されている。また冬季の道路粉塵公害が深刻化
し、スパイクタイヤの使用禁止処置等が検討され、それ
に伴い融雪剤等による塩化物腐食に対する耐食性の要求
が欧米だけでなく日本でも強くなってきている。これら
に対しても13Cr−1Si−Al合金では、十分な耐
久性を示していない。
On the other hand, with the diversification of automobile fuels, the use of alcohol fuel is being seriously considered, and there is a concern that corrosion may occur due to the generation of organic acids such as acetic acid and formic acid due to oxidation of alcohol. In addition, road dust pollution in winter is becoming more serious, and measures such as banning the use of spiked tires are being considered.As a result, the demand for corrosion resistance against chloride corrosion caused by snow-melting agents is becoming stronger not only in Europe and America but also in Japan. The 13Cr-1Si-Al alloy does not exhibit sufficient durability for these as well.

【0005】さらに自動車用電子制御燃料噴射装置材料
は、軟磁気特性が特に必要とされ、かかる磁気特性の向
上は直接自動車用電子制御燃料噴射装置の特性向上に直
結している。
Furthermore, materials for electronically controlled fuel injection devices for automobiles are particularly required to have soft magnetic properties, and improvements in such magnetic properties are directly linked to improvements in the characteristics of electronically controlled fuel injection devices for automobiles.

【0006】[0006]

【発明が解決しようとする課題】上述したとおり、自動
車用電子制御燃料噴射装置材料が要求される特性は、広
範囲にわたり、しかもこれ等の特性は相互に関連し、多
くの場合には相反する性質として記述されている。この
発明の目的は、上述したような自動車用電子制御燃料噴
射装置材料に必要とされる諸特性の全てを満足する高冷
鍛電磁ステンレス鋼を提案するところにある。
[Problems to be Solved by the Invention] As mentioned above, the characteristics required of materials for electronically controlled fuel injection devices for automobiles are wide-ranging, and these characteristics are interrelated and often contradictory. It is described as. An object of the present invention is to propose a high-cold forged electromagnetic stainless steel that satisfies all of the characteristics required for materials for electronically controlled fuel injection devices for automobiles as described above.

【0007】[0007]

【課題を解決するための手段】さて発明者らは、上記の
目的を達成すべく、広範囲にわたる検討を行ったところ
、次に述べる知見を得た。 1)フェライト系電磁ステンレス鋼にTi, Bを複合
添加することによって、この合金中のC,N低減効果が
向上し、冷間鍛造前の母材焼鈍による結晶粒を微細かつ
整粒として、各結晶粒の粗大化が効果的に抑制され、そ
の結果、冷鍛での割れ感受性が大幅に改善され、冷間鍛
造性が飛躍的に向上する。 2)また同時にTi, Bの複合添加によって製品の良
好な磁気特性を示す温度範囲が拡がり、しかも各結晶粒
は比較的微細で均一な組織を呈するので軟磁気特性も向
上する。 3)さらにTi, Nb, Vについては、基地中のC
,Nを低減することにより、良好な磁気特性および冷鍛
性を示す。 4)またさらにTi, B, Mo, Cuを複合添加
することにより、磁気焼鈍後の耐食性が大幅に向上する
。この理由は、Ti, BがC,Nを固定し、実質的含
有量を低減するだけでなく、Ti, B, Mo, C
uを共存して含むことにより、Crの酸化被膜が非常に
緻密化し、強化されるためと考えられ、特に塩化物腐食
および有機酸に対する耐食性が飛躍的に向上する。
[Means for Solving the Problems] In order to achieve the above object, the inventors conducted extensive studies and obtained the following knowledge. 1) By adding Ti and B in combination to ferritic electromagnetic stainless steel, the effect of reducing C and N in this alloy is improved, and the crystal grains produced by annealing the base material before cold forging are made fine and regular, and each Coarsening of crystal grains is effectively suppressed, and as a result, cracking sensitivity during cold forging is significantly improved, and cold forgeability is dramatically improved. 2) At the same time, the combined addition of Ti and B expands the temperature range in which the product exhibits good magnetic properties, and since each crystal grain exhibits a relatively fine and uniform structure, the soft magnetic properties are also improved. 3) Furthermore, regarding Ti, Nb, and V, C in the base
, N exhibits good magnetic properties and cold forgeability. 4) Furthermore, by adding Ti, B, Mo, and Cu in combination, the corrosion resistance after magnetic annealing is greatly improved. The reason for this is that Ti, B not only fixes C and N and reduces the substantial content, but also Ti, B, Mo, C
This is thought to be due to the coexistence of u, which makes the Cr oxide film extremely dense and strengthens it, and in particular, the corrosion resistance against chloride corrosion and organic acids is dramatically improved.

【0008】この発明は上記の知見に立脚するものであ
る。すなわちこの発明は、C:0.02wt%(以下単
に%で示す)以下、Si:0.01〜0.50%、Mn
:0.01〜0.50%、Cr:7.00〜20.00
 %、Mo:0.30〜2.00%、Cu:0.10〜
2.00%、Ti:0.05〜0.50%、Al:0.
05〜3.00%、B:0.0005〜0.05%およ
びN:0.05%以下を含み、残部は実質的Feの組成
からなる高冷鍛電磁ステンレス鋼(第1発明)である。
The present invention is based on the above knowledge. That is, the present invention provides C: 0.02 wt% or less (hereinafter simply expressed as %), Si: 0.01 to 0.50%, Mn
:0.01~0.50%, Cr:7.00~20.00
%, Mo: 0.30~2.00%, Cu: 0.10~
2.00%, Ti: 0.05-0.50%, Al: 0.
05 to 3.00%, B: 0.0005 to 0.05%, and N: 0.05% or less, with the remainder being substantially Fe (first invention). .

【0009】またこの発明は、第1発明にさらにNb:
1.00%以下およびV:1.00%以下のうちから選
んだ少なくとも一種を含む組成になる高冷鍛電磁ステン
レス鋼(第2発明)である。
[0009] Furthermore, the present invention further includes Nb:
This is a high-cold forged electromagnetic stainless steel (second invention) having a composition containing at least one selected from V: 1.00% or less and V: 1.00% or less.

【0010】さらにこの発明は、第1または第2発明に
さらにPb:0.30%以下、Ca:0.03%以下、
Se:0.20%以下およびS:0.20%以下のうち
から選んだ少なくとも一種を含む組成になる高冷鍛電磁
ステンレス鋼(第3発明)である。
[0010] Furthermore, the present invention further provides Pb: 0.30% or less, Ca: 0.03% or less, in addition to the first or second invention.
This is a high-cold forged electromagnetic stainless steel (third invention) having a composition containing at least one selected from Se: 0.20% or less and S: 0.20% or less.

【0011】またさらにこの発明は、第1、第2または
第3発明にさらにRem:0.01%以下を含む組成に
なる高冷鍛電磁ステンレス鋼(第4発明)である。
[0011] Furthermore, the present invention is a high-cold forged electromagnetic stainless steel (fourth invention) having a composition that further includes Rem: 0.01% or less in the first, second, or third invention.

【0012】以下、この発明の基礎となった実験結果に
ついて説明する。供試鋼として、次に示すa)C:0.
008 %, Si:0.15%, Mn:0.20%
, Cr:13.35 %, Mo:0.50%, C
u:0.45%, Ti:0.11%, Al:0.7
8%, B:0.011 %およびN:0.015 %
を含み、残部実質的にFeの組成になる鋼(Ti, B
添加鋼)、b)C:0.010 %, Si:0.14
%, Mn:0.20%, Cr:13.26 %, 
Mo:0.49%, Cu:0.51%, Ti:0.
10%, Al:0.73%, B:0.0003%お
よびN:0.017 %を含み、残部実質的にFeの組
成になる鋼(Ti添加鋼)、c)C:0.006 %,
 Si:0.14%, Mn:0.19%, Cr:1
3.21 %, Mo:0.49%, Cu:0.43
%, Ti:0.003 %, Al:0.73%, 
B:0.0002%およびN:0.015 %を含み、
残部実質的にFeの組成になる鋼(Ti, B無添加鋼
)を用い、それぞれAr気流中で5kgづつ誘導溶解し
、65mmφのインゴットを作製した。ついで各インゴ
ットを1050℃で熱間鍛造し、15mmφの丸棒を作
製後、13mmφまで冷間圧延し供試材とした。かくし
て得られた各供試鋼の割れ限界加工率および磁気特性に
ついて調べた結果を、図1,2に示す。
[0012] The experimental results that formed the basis of this invention will be explained below. As the test steel, the following a) C: 0.
008%, Si: 0.15%, Mn: 0.20%
, Cr:13.35%, Mo:0.50%, C
u: 0.45%, Ti: 0.11%, Al: 0.7
8%, B: 0.011% and N: 0.015%
steel (Ti, B
Additive steel), b) C: 0.010%, Si: 0.14
%, Mn: 0.20%, Cr: 13.26%,
Mo: 0.49%, Cu: 0.51%, Ti: 0.
10%, Al: 0.73%, B: 0.0003% and N: 0.017%, the remainder being substantially Fe (Ti-added steel), c) C: 0.006% ,
Si: 0.14%, Mn: 0.19%, Cr: 1
3.21%, Mo: 0.49%, Cu: 0.43
%, Ti: 0.003%, Al: 0.73%,
Contains B: 0.0002% and N: 0.015%,
The remainder of the steel (steel without addition of Ti or B) having a composition of substantially Fe was used, and 5 kg of each steel was induction melted in an Ar gas flow to produce ingots of 65 mm in diameter. Each ingot was then hot-forged at 1050°C to produce a round bar with a diameter of 15 mm, which was then cold-rolled to a diameter of 13 mm to obtain a test material. The results of investigating the cracking limit working rate and magnetic properties of each test steel thus obtained are shown in FIGS. 1 and 2.

【0013】図1は、焼鈍温度と冷間加工割れ限界との
関係を示したもので、Ti, Bを複合添加するこによ
って、割れの発生無しに加工できる焼鈍温度範囲が高温
度まで広がり、しかも割れ発生限界加工率も高加工度ま
で可能となることが判る。
[0013] Figure 1 shows the relationship between annealing temperature and cold working cracking limit. By adding Ti and B in combination, the annealing temperature range that can be processed without cracking is extended to high temperatures. Furthermore, it can be seen that the critical machining rate for crack occurrence can be increased to a high degree of machining.

【0014】図2は、鋼a、鋼cの焼鈍温度と磁気特性
との関係を示したもので、鋼aでは広い温度範囲で良好
な磁気特性を呈した。これに対し鋼cでは、950 ℃
以上で磁気特性の向上が見られるものの、この温度範囲
になると組織が粗粒化する傾向が見られた。上述したよ
うに、Ti, Bを複合含有させることにより、微細な
整粒組織とし、冷間鍛造性や磁気特性の著しい向上が達
成されたのである。
FIG. 2 shows the relationship between the annealing temperature and magnetic properties of Steel A and Steel C. Steel A exhibited good magnetic properties over a wide temperature range. On the other hand, for steel c, the temperature is 950 ℃
Although an improvement in magnetic properties was observed in the above temperature range, there was a tendency for the structure to become coarse grained. As mentioned above, by containing Ti and B in a composite manner, a fine grained structure was created, and significant improvements in cold forgeability and magnetic properties were achieved.

【0015】[0015]

【作用】この発明において、合金成分を前記の組成範囲
に限定した理由は次のとおりである。C:0.02%以
下Cは、ステンレス鋼中で耐食性、磁気特性、冷間鍛造
性を著しく劣化させる元素であり、0.01%以下が望
ましいが、ステンレス鋼の製造時やむを得なく混入する
もので、実操業上を鑑み0.02%以下とした。
[Operation] In this invention, the reason why the alloy components are limited to the above composition range is as follows. C: 0.02% or less C is an element that significantly deteriorates corrosion resistance, magnetic properties, and cold forgeability in stainless steel, and is preferably 0.01% or less, but it is unavoidably mixed during the manufacture of stainless steel. In consideration of actual operation, the content was set to 0.02% or less.

【0016】Si:0.01〜0.50%Siは、鋼中
にあって、脱酸剤として有用なだけでなく、フェライト
鋼の磁気特性の改善にも有効に寄与する。また電気抵抗
を増加し高周波領域のレスポンス特性の改善にも有用で
あるが、一方で硬度を著しく増加し冷間鍛造性を阻害す
る。ただし0.01%未満では上記の効果に乏しく、一
方0.50%を超えると冷間鍛造性が阻害されるように
なるので、含有量は0.01〜0.50%に限定した。
Si: 0.01 to 0.50% Si is present in steel and is not only useful as a deoxidizing agent, but also effectively contributes to improving the magnetic properties of ferritic steel. It is also useful for increasing electrical resistance and improving response characteristics in the high frequency range, but on the other hand, it significantly increases hardness and inhibits cold forgeability. However, if it is less than 0.01%, the above effects will be poor, and if it exceeds 0.50%, cold forgeability will be impaired, so the content was limited to 0.01 to 0.50%.

【0017】Mn:0.01〜0.50%%Mnは、ス
テンレス鋼中にあって、脱酸剤として効果的な元素であ
るが、過度の添加は磁気特性を阻害するので、0.01
〜0.50%の範囲に限定した。
Mn: 0.01-0.50% Mn is an element that is present in stainless steel and is effective as a deoxidizing agent, but excessive addition inhibits magnetic properties, so 0.01% Mn is an element that is effective as a deoxidizing agent.
It was limited to a range of 0.50%.

【0018】Cr:7.00〜20.00 %Crは、
本合金中における主要成分で、耐食性、磁気特性および
電気抵抗に最も効果的な元素の一つであり、特にMo,
 Cu, Tiと共存することによって、磁気焼鈍後の
酸化被膜を非常に緻密で強力なものとして優れた耐食性
を堅持し、磁気特性も良好となる。しかしながら含有量
が7.00%に満たないとその添加効果に乏しく、一方
 20.00%を超えると磁気特性(具体的には磁束密
度)の劣化を招くだけでなく、冷間鍛造性も阻害される
ので、7.00〜20.00 %  の範囲に限定した
[0018] Cr: 7.00-20.00% Cr is
It is the main component in this alloy and is one of the most effective elements for corrosion resistance, magnetic properties and electrical resistance, especially Mo,
By coexisting with Cu and Ti, the oxide film after magnetic annealing becomes extremely dense and strong, maintaining excellent corrosion resistance and providing good magnetic properties. However, if the content is less than 7.00%, the addition effect will be poor, while if it exceeds 20.00%, it will not only cause deterioration of magnetic properties (specifically, magnetic flux density) but also inhibit cold forgeability. Therefore, it was limited to a range of 7.00 to 20.00%.

【0019】Mo:0.30〜2.00%Moは、Cr
, Ti, Cuとの共存によって耐食性を著しく改善
する。しかし0.30%未満ではその効果は顕著ではな
く、一方2.00%を超えると冷間鍛造性を阻害するば
かりでなく、高価ともなるので、0.30〜2.00%
の範囲に限定した。
Mo: 0.30-2.00%Mo is Cr
, Ti, and Cu significantly improve corrosion resistance. However, if it is less than 0.30%, the effect is not significant, while if it exceeds 2.00%, it not only impedes cold forgeability but also becomes expensive.
limited to the range of

【0020】Cu:0.10〜2.00%Cuは、Cr
, Mo, Tiと共存させることによって耐食性を著
しく向上させるだけでなく、少量の添加で変形能を改善
し、冷間鍛造性の向上に有効に寄与し、さらに電気抵抗
も向上する。しかし0.10%未満では、その効果は顕
著ではなく、一方、2.00%を超えると磁気特性の劣
化が大きくなるだけでなく、硬度の増加も著しくなり冷
間鍛造性も阻害するようになるので、0.10〜2.0
0%の範囲に限定した。
Cu: 0.10-2.00% Cu is Cr
, Mo, and Ti not only significantly improve corrosion resistance, but also improve deformability with a small amount of addition, effectively contributing to improving cold forgeability, and further improving electrical resistance. However, if it is less than 0.10%, the effect is not significant, while if it exceeds 2.00%, not only will the magnetic properties deteriorate significantly, but the hardness will also increase significantly, impeding cold forgeability. Therefore, 0.10 to 2.0
It was limited to a range of 0%.

【0021】Ti:0.05 〜0.50%Tiは、B
と共に本合金中で最も重要な元素であり、Bと共存する
ことにより、鋼中のC,Nに効果的に作用し、冷間鍛造
前の結晶粒を微細かつ整粒として冷間鍛造性を飛躍的に
向上させる。しかもC,Nを均一に微細分散させること
によって磁気特性の向上にも寄与する。さらにTiはM
o, Cuと共存により、耐食性とくに塩化物および有
機酸に対する耐食性を飛躍的に向上する効果もある。し
かしながら含有量が0.05%未満では、その効果が充
分ではなく、一方0.50%を超えてもその効果は飽和
に達し、かえって製造上弊害が生じるので、含有量は0
.05〜0.50%の範囲に限定した。
[0021] Ti: 0.05 to 0.50% Ti is B
It is the most important element in this alloy, and when it coexists with B, it effectively acts on C and N in the steel, making the crystal grains fine and regularized before cold forging to improve cold forgeability. Improve dramatically. Furthermore, by uniformly and finely dispersing C and N, it also contributes to improving magnetic properties. Furthermore, Ti is M
Coexistence with Cu has the effect of dramatically improving corrosion resistance, particularly against chlorides and organic acids. However, if the content is less than 0.05%, the effect will not be sufficient, while if it exceeds 0.50%, the effect will reach saturation, and this will cause problems in manufacturing, so the content should be reduced to 0.
.. It was limited to a range of 0.05 to 0.50%.

【0022】Al:0.05〜3.00%Alは、本合
金中にあってSiと共に磁気特性を改善し、また電気抵
抗を効果的に増加して高周波領域でのレスポンス特性を
改善する有用元素であり、しかもSiに比較して硬度上
昇への寄与率は低い。しかしながら含有量が0.05%
に満たないと磁気特性の改善効果が充分ではなく、一方
3.00%を超えると特殊な精錬方法が必要になるばか
りでなく、冷間鍛造性を阻害するようになるので、Al
含有量は0.05〜3.00%の範囲に限定した。
Al: 0.05-3.00% Al is present in this alloy and is useful for improving the magnetic properties together with Si, and also for effectively increasing the electrical resistance and improving the response characteristics in the high frequency range. It is an element, and its contribution to hardness increase is lower than that of Si. However, the content is 0.05%
If it is less than 3.00%, the effect of improving magnetic properties will not be sufficient, while if it exceeds 3.00%, not only will a special refining method be required, but it will also impede cold forgeability.
The content was limited to a range of 0.05 to 3.00%.

【0023】B:0.0005〜0.05%Bは、Ti
と共に本合金中で特に有用な元素であり、本合金中のC
,Nに効果的に作用し、磁気特性を改善するばかりでな
く、結晶粒度も微細化し本合金の冷鍛性の改善にも有効
に寄与する。しかしながら含有量が0.0005%未満
ではその効果は充分でなく、一方0.05%を超えると
熱間、冷間での加工性が阻害されるので、0.0005
〜0.05%の範囲で含有させるものとした。
B: 0.0005 to 0.05% B is Ti
It is a particularly useful element in this alloy, and C
, N, not only improves the magnetic properties but also refines the grain size and effectively contributes to improving the cold forgeability of the alloy. However, if the content is less than 0.0005%, the effect is not sufficient, while if it exceeds 0.05%, hot and cold workability is inhibited, so 0.0005%
The content was set to be in the range of 0.05% to 0.05%.

【0024】N:0.05%以下 Nは、Cと同様、ステンレス鋼中で耐食性、磁気特性お
よび冷間鍛造性を著しく劣化させる元素であり、極力低
減することが望ましいが、0.05%以下の範囲で許容
される。
N: 0.05% or less N, like C, is an element that significantly deteriorates corrosion resistance, magnetic properties, and cold forgeability in stainless steel, and it is desirable to reduce it as much as possible, but 0.05% Permissible within the following ranges.

【0025】以上、基本成分について説明したが、この
発明では、さらにじん性を加味し、かつ冷間鍛造性およ
び磁気特性を向上させるためにNbおよび/またはVの
うち少なくとも一種を、また切削性を加味するためにP
b, Ca, SeおよびSのうちから選んだ少なくと
も一種を、さらにはより一層の冷間鍛造性の改善のため
 Remを添加することができる。
The basic components have been explained above, but in this invention, at least one of Nb and/or V is added in order to further improve toughness and improve cold forgeability and magnetic properties. P to take into account
At least one selected from B, Ca, Se, and S can be added, and Rem can also be added to further improve cold forgeability.

【0026】以下、これらの選択成分について説明する
。 Nb:1.00%以下、V:1.00%以下Nbおよび
Vはいずれも、本合金のじん性改善に有用なだけでなく
、冷間鍛造性および磁気特性の向上にも有効に寄与する
が、1.00%を超えるとかえって冷間鍛造性が阻害さ
れるので、1.00%以下で添加するものとする。
[0026] These selected components will be explained below. Nb: 1.00% or less, V: 1.00% or less Both Nb and V are not only useful for improving the toughness of this alloy, but also contribute effectively to improving cold forgeability and magnetic properties. However, if it exceeds 1.00%, cold forgeability will be hindered, so it should be added at 1.00% or less.

【0027】Pb:0.30%以下、Ca:0.03%
以下、Se:0.20%以下、S:0.20%以下Pb
, Ca, SeおよびSはいずれも、本合金の切削性
を改善する有用元素であるが、上限を超えて多量に含有
されるとかえって耐食性、磁気特性および冷間鍛造性の
劣化を招くので、それぞれ上限以下で添加するものとし
た。
[0027] Pb: 0.30% or less, Ca: 0.03%
Below, Se: 0.20% or less, S: 0.20% or less Pb
, Ca, Se, and S are all useful elements that improve the machinability of this alloy, but if they are contained in large amounts exceeding the upper limit, they will instead cause deterioration of corrosion resistance, magnetic properties, and cold forgeability. Each was added below the upper limit.

【0028】Rem(ランタノイド系元素):0.01
%以下Rem の添加により、さらに冷間鍛造性の向上
を図ることができるが、0.01%を超えると特殊な溶
解精錬方法が必要になるばかりでなく高価ともなるので
、0.01%以下で添加するものとした。
Rem (lanthanide element): 0.01
The addition of Rem can further improve the cold forgeability, but if it exceeds 0.01%, it not only requires a special melting and refining method but also becomes expensive. It was supposed to be added.

【0029】[0029]

【実施例】表1に示す種々の成分組成になる供試鋼(N
o.1〜No.14)を、Ar気流中で5kg誘導溶解
し、65mmφのインゴットを作製した。ついで各イン
ゴットを1050℃で熱間鍛造し、15mmφの丸棒を
作製後、13mmφまで冷間圧延し供試材とした。かく
して得られた供試材について、以下に述べるようにして
冷間鍛造性、磁気特性、耐食性および比抵抗について調
べた。得られた結果を表2にまとめて示す。
[Example] Test steel (N
o. 1~No. 14) was melted by induction in an Ar flow to produce an ingot of 65 mmφ. Each ingot was then hot-forged at 1050°C to produce a round bar with a diameter of 15 mm, which was then cold-rolled to a diameter of 13 mm to obtain a test material. The test materials thus obtained were examined for cold forgeability, magnetic properties, corrosion resistance, and specific resistance as described below. The obtained results are summarized in Table 2.

【0030】なお冷間鍛造性については、6mmφ×1
1mmH の試験片を作製し、油圧プレスで圧縮試験を
し、割れ発生限界加工率と80%まで圧縮したときの変
形抵抗で評価した。また磁気特性は、10mmφ× 5
.5mmφ×5mmt のリング試料を作製し、 75
0℃〜1050℃で磁気焼鈍後、B−Hループトレーサ
ーで直流磁気特性を測定した。さらに耐食性は、16m
mφ×20mmφ×35mmH の段付き試験片を作製
し、表面粗さを12s以下に仕上げたのち、真空中で 
950℃, 2hの磁気焼鈍を行い、ついで5%NaC
lの水溶液で35℃, 96hの塩水噴霧試験を行ない
、発銹の有無で評価した。また13mmφ×2mmの試
験片を作製し、 800番までサンドペーパーで研磨後
、真空中で 950℃, 2hの磁気焼鈍を行ったのち
、30℃の 3.5%NaCl水溶液中で孔食電位を測
定した。またさらに比抵抗は、各試料を1mmφまで冷
間線引きし、 850℃で真空焼鈍後、デジボルで測定
した。
Regarding cold forgeability, 6mmφ×1
A 1 mmH 2 test piece was prepared, subjected to a compression test using a hydraulic press, and evaluated by the cracking limit processing rate and deformation resistance when compressed to 80%. In addition, the magnetic properties are 10mmφ×5
.. A ring sample of 5 mmφ x 5 mmt was prepared, and 75
After magnetic annealing at 0°C to 1050°C, DC magnetic properties were measured using a B-H loop tracer. Furthermore, the corrosion resistance is 16m
A stepped test piece of mφ x 20mmφ x 35mmH was prepared, and after finishing the surface roughness to 12s or less, it was heated in a vacuum.
Magnetic annealing was performed at 950°C for 2 hours, and then 5% NaC
A salt water spray test was carried out using an aqueous solution of 35° C. for 96 hours, and the presence or absence of rusting was evaluated. In addition, a test piece of 13 mmφ x 2 mm was prepared, polished with sandpaper to a grit of 800, magnetically annealed in vacuum at 950°C for 2 hours, and then subjected to pitting potential in a 3.5% NaCl aqueous solution at 30°C. It was measured. Further, the specific resistance was measured by cold drawing each sample to a diameter of 1 mm, vacuum annealing at 850° C., and using Digivol.

【0031】[0031]

【表1】[Table 1]

【0032】[0032]

【表2】[Table 2]

【0033】表2より明らかなように、TiおよびBを
含有しない比較鋼No.9は、冷間鍛造性、磁気特性(
特にB1)および耐食性いずれにおいても良好な結果は
得られなかった。またTiのみ含有する比較鋼 No.
10は、磁気特性、耐食性は改善されるものの、冷間鍛
造性とくに変形抵抗に劣っている。さらにCrが下限量
に満たなく、またMo, Cuを含まない比較鋼 No
.11は、冷間加工性、磁気特性は良好であるが、耐食
性に劣っている。鋼 No.12は、C, N, Si
, Bが過剰に含まれているため、冷間加工性、磁気特
性、耐食性いずれも劣っている。鋼 No.13は、C
u, Moが過剰に含まれているために、耐食性は良好
ではあるものの、冷間加工性、磁気特性が劣っている。 鋼 No.14は、Cr, Alが過剰に含まれている
ために耐食性は良好であるが、冷間工性が劣っている。 さらに磁束密度(B25)が 1.0T以下と低く、自
動車用電子制御燃料噴射装置に使用した場合には吸引力
不足を起こす。
As is clear from Table 2, comparative steel No. 1 containing neither Ti nor B. 9 is cold forgeability, magnetic properties (
In particular, good results were not obtained in either B1) or corrosion resistance. Comparative steel No. containing only Ti.
Although No. 10 has improved magnetic properties and corrosion resistance, it is inferior in cold forgeability, particularly in deformation resistance. Comparative steel No. 1 whose Cr content does not meet the lower limit and does not contain Mo or Cu.
.. No. 11 has good cold workability and magnetic properties, but is poor in corrosion resistance. Steel No. 12 is C, N, Si
, B is contained in excess, so cold workability, magnetic properties, and corrosion resistance are all poor. Steel No. 13 is C
Due to the excessive content of u and Mo, although the corrosion resistance is good, the cold workability and magnetic properties are poor. Steel No. No. 14 has good corrosion resistance because it contains excess Cr and Al, but has poor cold workability. Furthermore, the magnetic flux density (B25) is as low as 1.0T or less, which causes insufficient suction power when used in electronically controlled fuel injection systems for automobiles.

【0034】これに対し、この発明に従う鋼 No.1
〜8はいずれも、80%以上の割れ限界加工率と850
 N/mm2 以下の低い変形抵抗を示し、また磁気特
性もHc≦0.80 A/cm 、B1 ≧0.35T
、B25≧1.20Tを呈し、さらに耐食性については
、200 mV以上の孔食電位を示し、塩水噴霧試験で
は全く錆の発生が認められなかった。さらに有機酸に対
しても全く侵食されず、アルコール燃料や粗悪ガソリン
に対する耐食性も優れていることが確認された。
On the other hand, steel No. according to the present invention. 1
~8 all have a cracking limit processing rate of 80% or more and 850
It exhibits low deformation resistance of N/mm2 or less, and has magnetic properties of Hc≦0.80 A/cm and B1≧0.35T.
, B25≧1.20T, and in terms of corrosion resistance, it exhibited a pitting potential of 200 mV or more, and no rust was observed in the salt spray test. Furthermore, it was confirmed that it was not attacked by organic acids at all and had excellent corrosion resistance against alcohol fuel and inferior gasoline.

【0035】[0035]

【発明の効果】かくしてこの発明によれば、結晶粒が微
細で均一な組織となり、優れた冷間鍛造性を有するだけ
でなく、良好な磁気特性および耐食性を兼ね備えた高冷
鍛電磁ステンレス鋼を得ることができ、自動車用電子制
御燃料噴射装置きハウジングやスリーブ、コア用材料、
各種センサー、水用電磁弁等として産業界に貢献すると
ころ大である。
[Effects of the Invention] Thus, according to the present invention, a high-cold forged electromagnetic stainless steel with fine and uniform crystal grains and excellent cold forgeability as well as good magnetic properties and corrosion resistance can be produced. Materials for housings, sleeves, and cores for automotive electronically controlled fuel injectors,
It greatly contributes to industry as various sensors, water solenoid valves, etc.

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】焼鈍温度と冷間加工割れ限界との関係を示した
グラフである。
FIG. 1 is a graph showing the relationship between annealing temperature and cold work cracking limit.

【図2】焼鈍温度と磁気特性との関係を示したグラフで
ある。
FIG. 2 is a graph showing the relationship between annealing temperature and magnetic properties.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】C:0.02wt%以下、Si:0.01
〜0.50wt%、Mn:0.01〜0.50wt%、
Cr:7.00〜20.00 wt%、Mo:0.30
〜2.00wt%、Cu:0.10〜2.00wt%、
Ti:0.05〜0.50wt%、Al:0.05〜3
.00wt%、B:0.0005〜0.05wt%およ
びN:0.05wt%以下を含み、残部は実質的Feの
組成からなる高冷鍛電磁ステンレス鋼。
Claim 1: C: 0.02wt% or less, Si: 0.01
~0.50wt%, Mn:0.01~0.50wt%,
Cr: 7.00-20.00 wt%, Mo: 0.30
~2.00wt%, Cu:0.10~2.00wt%,
Ti: 0.05-0.50wt%, Al: 0.05-3
.. 00 wt%, B: 0.0005 to 0.05 wt%, and N: 0.05 wt% or less, with the remainder being substantially Fe.
【請求項2】  請求項1において、さらにNb:1.
00wt%以下およびV:1.00wt%以下のうちか
ら選んだ少なくとも一種を含む組成になる高冷鍛電磁ス
テンレス鋼。
2. In claim 1, further Nb: 1.
1.00 wt% or less and V: 1.00 wt% or less.
【請求項3】  請求項1または2において、さらにP
b:0.30wt%以下、Ca:0.03wt%以下、
Se:0.20wt%以下およびS:0.20wt%以
下のうちから選んだ少なくとも一種を含む組成になる高
冷鍛電磁ステンレス鋼。
[Claim 3] In Claim 1 or 2, further P
b: 0.30 wt% or less, Ca: 0.03 wt% or less,
A high-cold forged electromagnetic stainless steel having a composition containing at least one selected from Se: 0.20 wt% or less and S: 0.20 wt% or less.
【請求項4】  請求項1、2または3において、さら
にRem:0.01wt%以下を含む組成になる高冷鍛
電磁ステンレス鋼。
4. The high-cold forged electromagnetic stainless steel according to claim 1, further comprising 0.01 wt% or less of Rem.
JP10831591A 1991-04-15 1991-04-15 High cold forging electromagnetic stainless steel Expired - Lifetime JP3197573B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10831591A JP3197573B2 (en) 1991-04-15 1991-04-15 High cold forging electromagnetic stainless steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10831591A JP3197573B2 (en) 1991-04-15 1991-04-15 High cold forging electromagnetic stainless steel

Publications (2)

Publication Number Publication Date
JPH04318153A true JPH04318153A (en) 1992-11-09
JP3197573B2 JP3197573B2 (en) 2001-08-13

Family

ID=14481596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10831591A Expired - Lifetime JP3197573B2 (en) 1991-04-15 1991-04-15 High cold forging electromagnetic stainless steel

Country Status (1)

Country Link
JP (1) JP3197573B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779374A1 (en) * 1995-12-15 1997-06-18 Nisshin Steel Co., Ltd. Stainless steel improved in anti-microbial property and manufacturing thereof
JP2001140034A (en) * 1999-09-03 2001-05-22 Kiyohito Ishida Free-cutting alloy material
US7297214B2 (en) 1999-09-03 2007-11-20 Kiyohito Ishida Free cutting alloy
US7381369B2 (en) 1999-09-03 2008-06-03 Kiyohito Ishida Free cutting alloy
JP2012233246A (en) * 2011-05-09 2012-11-29 Daido Steel Co Ltd Electromagnetic stainless steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779374A1 (en) * 1995-12-15 1997-06-18 Nisshin Steel Co., Ltd. Stainless steel improved in anti-microbial property and manufacturing thereof
JP2001140034A (en) * 1999-09-03 2001-05-22 Kiyohito Ishida Free-cutting alloy material
US7297214B2 (en) 1999-09-03 2007-11-20 Kiyohito Ishida Free cutting alloy
US7381369B2 (en) 1999-09-03 2008-06-03 Kiyohito Ishida Free cutting alloy
JP2012233246A (en) * 2011-05-09 2012-11-29 Daido Steel Co Ltd Electromagnetic stainless steel

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