JP2859287B2 - High hardness corrosion-resistant wear-resistant stainless steel for induction hardening - Google Patents
High hardness corrosion-resistant wear-resistant stainless steel for induction hardeningInfo
- Publication number
- JP2859287B2 JP2859287B2 JP6284689A JP6284689A JP2859287B2 JP 2859287 B2 JP2859287 B2 JP 2859287B2 JP 6284689 A JP6284689 A JP 6284689A JP 6284689 A JP6284689 A JP 6284689A JP 2859287 B2 JP2859287 B2 JP 2859287B2
- Authority
- JP
- Japan
- Prior art keywords
- induction hardening
- resistant
- hardness
- stainless steel
- wear
- 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.)
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、主にIC製造装置や精密測定機、自動車部品
等に用いられるステンレス鋼製のシャフトを製造する時
に必要な高周波焼入に適した、高硬度で高耐食耐摩耗性
を有するステンレス鋼に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is suitable for induction hardening necessary for manufacturing stainless steel shafts mainly used for IC manufacturing equipment, precision measuring machines, automobile parts and the like. The present invention also relates to a stainless steel having high hardness and high corrosion and wear resistance.
マルテンサイト系ステンレス鋼は、高硬度が得られる
こと、また耐食性と耐摩耗性に優れることから、従来よ
り、ベアリング用途をはじめとして多くの産業分野で広
く使用されている。マルテンサイト系ステンレス鋼のう
ち主に使用されている鋼種は、JIS SUS440Cに代表され
る高炭素−17Cr系のものである。この鋼は通常、ガス加
熱炉または電気加熱炉により加熱され焼入し、焼もどし
してから使用されている。しかし最近では、低コスト化
の要求から従来の焼入方法から高周波焼入の方法が検討
されつつある。高周波焼入れに際しては、焼入性が良い
ことが絶対条件であるが、SUS440Cでは硬さ的に満足さ
れていない。特に、表面を硬化させて使用されるシャフ
ト用途の場合、SUS440Cを高周波焼入して得られる硬さ
は、せいぜいHRC53程度なので使用には全く供し得ない
状況にある。Martensitic stainless steel has been widely used in many industrial fields including bearing applications since it has high hardness and excellent corrosion resistance and wear resistance. Among martensitic stainless steels, the mainly used steel type is a high carbon-17Cr type represented by JIS SUS440C. This steel is usually used after being heated and quenched in a gas heating furnace or an electric heating furnace, and then tempered. However, recently, a method of induction hardening has been studied from a conventional quenching method due to a demand for cost reduction. In induction hardening, good hardenability is an absolute condition, but SUS440C is not satisfactory in terms of hardness. In particular, in the case of shaft applications where the surface is hardened, the hardness obtained by induction hardening SUS440C is at most about HRC53, so that it cannot be used at all.
高周波焼入れによる焼入焼もどし処理後の硬さがHRC5
8以上を示すマルテンサイト系ステンレスとして知られ
ているものには、例えば、特開昭48−88014号(C:0.75
〜0.95%、Si:0.1〜0.5%、Mn:0.1〜2.0、Cr:11.0〜14.
0%、Mo:0.1〜1.5%、V:0.1〜1.0%、Fe:Bal)、特公昭
57−45821号(C:1.1〜1.5%、Si:≦2.0%、Mn:≦1.0
%、Cr:7.0〜11.0%、Mo:0.5〜4.0%、V:0.1〜1.0%、F
e:Bal)、特公昭62−56226号(C:1.2〜1.6%、Si:0.8〜
1.6%、Mn:1.0〜1.5%、Cr:9〜12%、Mo:0.3〜0.6%、
V:0.1〜0.8%、Fe:Bal)および特開昭60−243249号(C:
0.5〜0.7%、Si:1〜2%、Mn:≦1.0%、Cr:9〜15%、M
o:1〜3%、Fe:Bal)がある。HRC5 hardness after quenching and tempering by induction hardening
Known martensitic stainless steels exhibiting 8 or more include, for example, JP-A-48-88014 (C: 0.75
0.95%, Si: 0.1-0.5%, Mn: 0.1-2.0, Cr: 11.0-14.
0%, Mo: 0.1-1.5%, V: 0.1-1.0%, Fe: Bal)
No. 57-45821 (C: 1.1 to 1.5%, Si: ≤ 2.0%, Mn: ≤ 1.0
%, Cr: 7.0-11.0%, Mo: 0.5-4.0%, V: 0.1-1.0%, F
e: Bal), JP-B-62-56226 (C: 1.2-1.6%, Si: 0.8-
1.6%, Mn: 1.0-1.5%, Cr: 9-12%, Mo: 0.3-0.6%,
V: 0.1-0.8%, Fe: Bal) and JP-A-60-243249 (C:
0.5 to 0.7%, Si: 1 to 2%, Mn: ≤ 1.0%, Cr: 9 to 15%, M
o: 1-3%, Fe: Bal).
すなわち、焼入性向上のためにMn、Moを添加し、また
硬さを向上させるための炭素量は、炭化物形成元素(耐
摩耗性)との関係から限定されているものである。That is, the amount of carbon for adding Mn and Mo for improving the hardenability and for improving the hardness is limited in relation to the carbide forming element (wear resistance).
SUS440Cを初めとする前記の公知例では、以下に述べ
る欠点により高周波焼入で簡単に熱処理し、高硬度で高
耐食耐摩耗性を有するシャフト材として使用するには適
さない。すなわち、SUS440Cでは、Cr/Cの比が大きく、
焼入れにおける硬さが低くなる。また残留オーステナイ
トが多くなることも硬さが出ないことの一因である。特
開昭48−88014号で開示されている成分系では、基地の
C量が不足し硬さは出ない。特開昭57−45821号、特開
昭62−56226号ではC量に対しCr量が少なく、耐食性が
劣り、用途上問題がある。特開昭60−243249号も残留オ
ーステナイト量としてはSUS440Cよりも少ないものの硬
さは低い。これらの公知例では、シャフト材として要求
されている硬さHRC60以上は達成されず、また、耐食性
においても、十分要求を満足していないのが現状であ
る。The above-mentioned known examples including SUS440C are not suitable for use as shaft materials having high hardness, high corrosion resistance and high wear resistance because they are easily heat-treated by induction hardening due to the following disadvantages. In other words, in SUS440C, the ratio of Cr / C is large,
Hardness in quenching decreases. In addition, an increase in retained austenite also contributes to lack of hardness. In the component system disclosed in JP-A-48-88014, the amount of C in the matrix is insufficient and no hardness is obtained. In JP-A-57-45821 and JP-A-62-56226, the amount of Cr is smaller than the amount of C, the corrosion resistance is poor, and there is a problem in use. JP-A-60-243249 also discloses that the amount of retained austenite is smaller than that of SUS440C but the hardness is low. In these known examples, a hardness of HRC60 or more required as a shaft material is not achieved, and at present, the requirements for corrosion resistance are not sufficiently satisfied.
本発明の目的は、上記の欠点を解消し、高周波焼入で
も少なくとも表面硬さがHRC60以上の十分な硬さが得ら
れ、かつ高耐食耐摩耗性を有するステンレス鋼を提供す
ることである。An object of the present invention is to provide a stainless steel which solves the above-mentioned drawbacks, has a sufficient surface hardness of at least HRC60 or more even by induction hardening, and has high corrosion and wear resistance.
本発明は、重量比で、C:0.96〜1.10%、Si:0.80〜1.2
0%、Mn:1.0%以下、Cr:12.00〜15.00%、Mo:0.30〜0.7
0%、V:0.10〜0.30%、残部Feおよび不可避的不純物よ
りなることを特徴とする高周波焼入用高硬度耐食耐摩耗
ステンレス鋼であり、Cr/C比が11から14に制御され、ま
たシャフトに用いられる高周波焼入用高硬度耐食耐摩耗
ステンレス鋼である。The present invention, by weight ratio, C: 0.96 to 1.10%, Si: 0.80 to 1.2
0%, Mn: 1.0% or less, Cr: 12.00-15.00%, Mo: 0.30-0.7
0%, V: 0.10 ~ 0.30%, balance Fe and inevitable impurities, high hardness hardening corrosion resistant wear resistant stainless steel for induction hardening, Cr / C ratio is controlled from 11 to 14, High hardness corrosion-resistant wear-resistant stainless steel for induction hardening used for shafts.
以下に本発明における成分限定理由を述べる。 The reasons for limiting the components in the present invention are described below.
Cは基地の硬さを高くするために必要な元素であり、
炭化物を形成し耐摩耗性を向上させる。Cが0.96%未満
では、高周波焼入に際してHRC60以上の表面硬さが得ら
れない。Cを1.10%を越えて添加すると、本発明のCr含
有量では耐食性が劣化するので、Cの範囲を0.96〜1.10
%とした。C is an element necessary for increasing the hardness of the base,
Form carbides to improve wear resistance. If C is less than 0.96%, a surface hardness of HRC 60 or more cannot be obtained during induction hardening. If C is added in excess of 1.10%, the corrosion resistance deteriorates with the Cr content of the present invention, so the range of C is set to 0.96 to 1.10.
%.
Siは脱酸剤として添加されるが、焼もどし軟化抵抗を
大きくする効果がある。その効果は0.80%未満では小さ
く、かつ1.20%を越えて添加しても、添加量に見合う効
果は得られない。したがって、Si成分範囲を0.80〜1.20
%とした。Si is added as a deoxidizing agent, but has the effect of increasing tempering softening resistance. The effect is small when it is less than 0.80%, and even if it exceeds 1.20%, the effect corresponding to the added amount cannot be obtained. Therefore, the Si component range is 0.80 to 1.20
%.
Mnは脱酸剤および焼入性向上元素として添加するが、
1.0%を越えて添加してもその効果は少なく、したがっ
て上限を1.0%とした。Mn is added as a deoxidizing agent and a hardenability improving element,
Even if added over 1.0%, the effect is small, so the upper limit was made 1.0%.
Crは耐食性を向上させ、かつ炭化物を形成し耐摩耗性
を高める。12.00%未満では本発明のC量では十分な耐
食性が得られず、また15.00%を越えて添加しても、耐
食性の向上が添加量に見合うほど得られず、Cr/Cの比が
大きくなり、高周波焼入に際し、硬さHRC60以上得られ
ない。したがって、Crの成分範囲を12.00〜15.00%とし
た。Cr improves corrosion resistance and forms carbides to increase wear resistance. If it is less than 12.00%, sufficient corrosion resistance cannot be obtained with the amount of C of the present invention, and even if it exceeds 15.00%, the improvement of corrosion resistance cannot be obtained in proportion to the added amount, and the ratio of Cr / C becomes large. In case of induction hardening, hardness of HRC60 or more cannot be obtained. Therefore, the Cr component range is set to 12.00 to 15.00%.
Moは、焼入性を向上させ、結晶粒を微細化し靱性を向
上させるために添加する。また、Moは耐食性をも向上さ
せるが、0.30%未満ではこれらの効果が少なく、0.7%
を越えて添加しても、添加量に見合う効果は得られな
い。したがって、Moの成分範囲を0.30〜0.70%とした。Mo is added to improve hardenability, refine crystal grains and improve toughness. Mo also improves the corrosion resistance, but less than 0.30% has less of these effects, and 0.7%
Even if it is added in excess of the above, an effect corresponding to the added amount cannot be obtained. Therefore, the component range of Mo is set to 0.30 to 0.70%.
Vは、VC炭化物を形成し、結晶粒を微細化し靱性を高
める効果がある。本発明では、炭化物として基地中のC
を固定し焼入に際してできるだけ固溶させないようにし
た。すなわち、基地中のCを低下させ残留オーステナイ
ト量をできるだけ少なくするために添加するものであ
る。0.10%未満ではその効果が少なく、0.30%を越えて
添加すると、巨大炭化物を形成し靱性を劣化させるとと
もに、基地のC量が低下し硬さが低下する。したがっ
て、Vの成分範囲としては、0.10〜0.30%とした。V forms VC carbides, has the effect of refining crystal grains and increasing toughness. In the present invention, C in the base is used as a carbide.
Was fixed so as not to dissolve as much as possible during quenching. That is, it is added to reduce C in the matrix and reduce the amount of retained austenite as much as possible. If it is less than 0.10%, the effect is small, and if it exceeds 0.30%, a giant carbide is formed and the toughness is deteriorated, and the C content of the matrix is lowered and the hardness is lowered. Therefore, the component range of V is set to 0.10 to 0.30%.
以下に本発明の実施例を示す。 Hereinafter, examples of the present invention will be described.
第1表は、本実施例に用いた合金の成分(重量%)と
硬さの測定値を示すものである。Table 1 shows the measured values of the components (% by weight) and the hardness of the alloy used in this example.
上記第1表の成分の鋼塊から熱間圧延と冷間加工によ
りφ8mmの棒鋼を製造し、高周波焼入テストを行った。 A steel bar having a diameter of 8 mm was manufactured by hot rolling and cold working from a steel ingot having the components shown in Table 1 above, and an induction hardening test was performed.
高周波焼入条件は、1100℃でコイル移動速度は、12.5
mm/secとし、水冷で急冷した後、焼もどしは180℃×1
時間保持後空冷とした。The induction hardening condition is 1100 ° C and the coil moving speed is 12.5
mm / sec, after quenching with water cooling, tempering 180 ° C x 1
After holding for a while, air cooling was performed.
従来合金のうち、試料番号6ないし9は、前記の特許
公報に記載の代表的な合金である。また、第1表には、
SUS440Cについての評価も記載されている。Among the conventional alloys, Sample Nos. 6 to 9 are representative alloys described in the above-mentioned Patent Publication. Table 1 shows that
The evaluation about SUS440C is also described.
硬さの評価は、シャフト類の最も必要とされる最表面
から1mm深さの位置におけるビッカース硬さの測定によ
り行なった。The hardness was evaluated by measuring Vickers hardness at a depth of 1 mm from the most required outermost surface of the shafts.
従来合金は、いずれもHRC換算でHRC60以下であり、硬
さが不十分であるが、本発明合金は、いずれもHV700以
上(HRC換算60.1以上)を示しており、目標の硬さが得
られた。All conventional alloys have an HRC equivalent of less than HRC 60 or less and have insufficient hardness, but the alloys of the present invention all show an HV of 700 or more (HRC equivalent of 60.1 or more), and the target hardness can be obtained. Was.
第1図は、試料番号1,2とSUS440Cについての深さ方向
の硬さ分布を示したが、本発明合金はビッカース硬さで
700以上((HRC換算60.1以上)を示しており、SUS440C
と対比して目標とする硬さが達成されていることがわか
る。また、第2図に塩水噴霧試験における耐食性テスト
結果を示したが、440C対比で本発明合金は同等以上の耐
食性を示すことがわかる。Fig. 1 shows the hardness distribution in the depth direction for sample Nos. 1 and 2 and SUS440C.
700 or more ((HRC equivalent 60.1 or more), SUS440C
It can be seen that the target hardness has been achieved as compared with. FIG. 2 shows the results of the corrosion resistance test in the salt spray test, and it can be seen that the alloy of the present invention shows equal or higher corrosion resistance than 440C.
以上のように、本発明によれば、簡易な焼入方法であ
る高周波焼入により、少なくとも表面部はHRC60以上の
硬さが得られるので、高硬度で高耐食耐摩耗性を有する
シャフト材等を容易に製造することができる。As described above, according to the present invention, since at least the surface portion has a hardness of HRC60 or more by induction hardening, which is a simple quenching method, a shaft material having high hardness, high corrosion resistance and wear resistance, Can be easily manufactured.
第1図は、本発明合金とSUS440Cの高周波焼入焼もどし
後の硬さ分布を示す図、第2図は塩水噴霧試験における
本発明合金とSUS440Cの耐食性試験結果を示す金属組織
写真である。FIG. 1 is a diagram showing the hardness distribution of the alloy of the present invention and SUS440C after induction hardening and tempering, and FIG. 2 is a metallographic photograph showing the results of a corrosion resistance test of the alloy of the present invention and SUS440C in a salt spray test.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−23049(JP,A) (58)調査した分野(Int.Cl.6,DB名) C22C 38/00 - 38/60────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-23049 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C22C 38/00-38/60
Claims (3)
0%、Mn:1.0%以下、Cr:12.00〜15.00%、Mo:0.30〜0.7
0%、V:0.10〜0.30%、残部Feおよび不可避的不純物よ
りなることを特徴とする高周波焼入用高硬度耐食耐摩耗
ステンレス鋼。1. A weight ratio of C: 0.96 to 1.10%, Si: 0.80 to 1.2
0%, Mn: 1.0% or less, Cr: 12.00-15.00%, Mo: 0.30-0.7
0%, V: 0.10 ~ 0.30%, balance Fe and unavoidable impurities, high hardness corrosion resistant wear resistant stainless steel for induction hardening.
とする請求項1に記載の高周波焼入用高硬度耐食耐摩耗
ステンレス鋼。2. The high hardness corrosion-resistant wear-resistant stainless steel for induction hardening according to claim 1, wherein the Cr / C ratio is controlled from 11 to 14.
求項1または2に記載の高周波焼入用高硬度耐食耐摩耗
ステンレス鋼。3. The high-hardness, corrosion-resistant, wear-resistant stainless steel for induction hardening according to claim 1, which is used for a shaft.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6284689A JP2859287B2 (en) | 1989-03-15 | 1989-03-15 | High hardness corrosion-resistant wear-resistant stainless steel for induction hardening |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6284689A JP2859287B2 (en) | 1989-03-15 | 1989-03-15 | High hardness corrosion-resistant wear-resistant stainless steel for induction hardening |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02243741A JPH02243741A (en) | 1990-09-27 |
JP2859287B2 true JP2859287B2 (en) | 1999-02-17 |
Family
ID=13212081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6284689A Expired - Lifetime JP2859287B2 (en) | 1989-03-15 | 1989-03-15 | High hardness corrosion-resistant wear-resistant stainless steel for induction hardening |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2859287B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2937735B2 (en) * | 1994-02-25 | 1999-08-23 | 山陽特殊製鋼株式会社 | Rust and wear resistant steel for induction hardening |
-
1989
- 1989-03-15 JP JP6284689A patent/JP2859287B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH02243741A (en) | 1990-09-27 |
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