JP2955731B2 - High-strength, high-toughness precipitation-hardening stainless steel alloy for plastic molding machines - Google Patents
High-strength, high-toughness precipitation-hardening stainless steel alloy for plastic molding machinesInfo
- Publication number
- JP2955731B2 JP2955731B2 JP24584392A JP24584392A JP2955731B2 JP 2955731 B2 JP2955731 B2 JP 2955731B2 JP 24584392 A JP24584392 A JP 24584392A JP 24584392 A JP24584392 A JP 24584392A JP 2955731 B2 JP2955731 B2 JP 2955731B2
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- Prior art keywords
- alloy
- strength
- toughness
- stainless steel
- steel alloy
- Prior art date
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Description
【０００１】本発明は、射出成形機用シリンダや押出成
形機用スクリユーシヤフト等のように高強度および高靱
性を要求される構造部材料として有用な析出硬化型ステ
ンレス合金に関する。The present invention relates to a precipitation hardening stainless steel alloy useful as a structural material requiring high strength and high toughness, such as a cylinder for an injection molding machine and a screw shaft for an extrusion molding machine.
【０００２】[0002]
【従来の技術】プラスチツク射出成形機や押出成形機等
のシリンダ、スクリユーシヤフト、プランジヤ等の構成
部材料として、従来より窒化鋼（ＪＩＳ Ｇ４２０２
ＳＡＣＭ６４５）が使用されてきた。また、繊維強化型
プラスチツクや難燃性プラスチツク等の成形・混練操業
に対する構成部材の耐摩耗性、耐食性等の改善策とし
て、部材の表面に耐食・耐摩耗合金からなるライニング
層を、溶射層や焼結合金層として積層成形したクラツド
部材を使用することも提案されている。2. Description of the Related Art Conventionally, nitrided steel (JIS G4202) has been used as a material for components such as cylinders, screw shafts and plungers of plastic injection molding machines and extrusion molding machines.
SACM 645) has been used. In addition, as a measure to improve the wear resistance and corrosion resistance of components for molding and kneading operations such as fiber-reinforced plastics and flame-retardant plastics, a lining layer made of a corrosion-resistant and wear-resistant alloy is provided on the surface of the members, It has also been proposed to use a clad member formed by lamination as a sintered alloy layer.
【０００３】[0003]
【発明が解決しようとする課題】近年、自動車や電子機
器分野での機械部品、構造部材として、また各種板材、
建材、容器等の長期使用を目的とした用途において、ポ
リアミド、ポリアセタール、ポリカーボネト等をはじめ
とする各種のエンジニアリングプラスチツク製品の需要
が増大している。これらのプラスチツクの成形操業にお
いては、汎用プラスチツクの成形操業に比べて、射出圧
力、混練トルク等の成形機構成部材に対する負荷が著し
く高く、このためシリンダやスクリユーシヤフト等の構
成部材に、強度、靱性の不足に因る破損のトラブルが頻
発している。そこで、本発明はこのようなプラスチツク
成形操業条件の苛酷化に対処するための成形機構成部材
料として有用な改良された高強度・高靱性を有する析出
硬化型ステンレス合金を提供するものである。In recent years, as mechanical parts and structural members in the field of automobiles and electronic devices, various plate materials,
In applications for long-term use such as building materials and containers, demands for various engineering plastic products such as polyamide, polyacetal, and polycarbonate are increasing. In the molding operation of these plastics, compared to the molding operation of general-purpose plastics, the load on the molding machine components such as injection pressure and kneading torque is remarkably high, so that components such as cylinders and screw shafts have strength, Frequent failures due to lack of toughness. Accordingly, the present invention provides a precipitation-hardening stainless steel alloy having improved high strength and high toughness useful as a material for a molding machine component to cope with such severe plastic molding operation conditions.
【０００４】[0004]
【課題を解決するための手段】本発明のプラスチック成
形機用析出硬化型ステンレス合金は、Ｃ：０．０５〜
０．２５％，Ｓｉ：０．５〜１．２％，Ｍｎ：０．２〜
１％，Ｎｉ：１．５〜９．５％，Ｃｒ：１０〜１６％，
Ｍｏ：１〜６％，Ｃｏ：１０〜１５％，Ｖ：０．２〜
０．５％，Ｃｕ：０．５〜５％，残部実質的にＦｅから
なる化学組成を有している。 The plastic component of the present invention is provided.
Precipitation hardening type stainless alloy for forming machine , C: 0.05 ~
0.25%, Si: 0.5 to 1.2%, Mn: 0.2 to
1%, Ni: 1.5 to 9.5%, Cr: 10 to 16%,
Mo: 1 to 6%, Co: 10 to 15%, V: 0.2 to
0.5% , Cu: 0.5-5%, balance substantially from Fe
Has the following chemical composition:
【０００５】[0005]
【作用】上記化学組成を有する本発明の合金は、溶体化
熱処理、サブゼロ処理、および時効処理からなる調質処
理により、マルテンサイトを母相とし、これに微細な炭
化物および金属間化合物相や規則格子相が微細に分散析
出した組織を呈し、従来の成形機構成部材である窒化鋼
では得られない高度の機械強度および耐衝撃特性を帯有
する。また、高硬度・高耐摩耗性を有すると共に、耐食
性も比較的良好である。The alloy of the present invention having the above-mentioned chemical composition has a martensite as a parent phase and a fine carbide and intermetallic compound phase and a regular phase by a tempering treatment including a solution heat treatment, a subzero treatment, and an aging treatment. It has a structure in which the lattice phase is finely dispersed and precipitated, and has a high mechanical strength and impact resistance that cannot be obtained by nitrided steel which is a conventional forming machine component. In addition, it has high hardness and high wear resistance and relatively good corrosion resistance.
【０００６】以下、本発明について詳しく説明する。本
発明合金の成分限定理由は次のとおりである。 Ｃ：０．０５〜０．２５％ Ｃは、Ｃｒ，Ｍｏ，Ｖ等と結合して炭化物を形成し、合
金の硬さ、強度を高める。この効果を得るためには少な
くとも０．０５％を必要とする。しかし、その増量は、
反面において合金の靱性、加工性の低下を招くので、
０．２５％を上限とする。Hereinafter, the present invention will be described in detail. The reasons for limiting the components of the alloy of the present invention are as follows. C: 0.05 to 0.25% C combines with Cr, Mo, V and the like to form carbides, and increases the hardness and strength of the alloy. To obtain this effect, at least 0.05% is required. However, the increase
On the other hand, it causes a decrease in the toughness and workability of the alloy,
The upper limit is 0.25%.
【０００７】Ｓｉ：０．５〜１．２％ Ｓｉは、合金溶製時の脱酸剤として、少なくとも０．５
％を必要とする。１．２％を越えると、合金の靱性が損
なわれるので、これを上限とする。Si: 0.5-1.2% Si is used as a deoxidizing agent at the time of melting the alloy at least at 0.5%.
Need%. If it exceeds 1.2%, the toughness of the alloy is impaired, so this is made the upper limit.
【０００８】Ｍｎ：０．２〜１％ Ｍｎは、脱硫元素であり、合金溶湯を清浄化し、材質を
改善する。０．２％に満たない量ではその効果が不足
し、他方１％を越えると、合金の靱性が損なわれるの
で、０．２〜１％とする。Mn: 0.2-1% Mn is a desulfurizing element, which cleans the molten alloy and improves the material. If the amount is less than 0.2%, the effect is insufficient, while if it exceeds 1%, the toughness of the alloy is impaired.
【０００９】Ｎｉ：１．５〜９．５％ Ｎｉは、合金の耐力、引張強さの改善に必要な元素であ
り、この効果を得るために、少なくとも１．５％を必要
とするが、多量の添加はコストの増大を招くだけでな
く、合金の鋳造性を悪くするので、９．５％を上限とす
る。Ni: 1.5 to 9.5% Ni is an element necessary for improving the yield strength and tensile strength of the alloy. To obtain this effect, at least 1.5% is required. The addition of a large amount not only increases the cost but also deteriorates the castability of the alloy, so the upper limit is 9.5%.
【００１０】Ｃｒ：１０〜１６％ Ｃｒは、合金の耐力、引張強さの確保に欠くことができ
ず、またその添加は合金の耐食性改善に奏効する元素で
ある。この効果を得るために少なくとも１０％を必要と
する。反面、多量の添加はコストの上昇の不利のみなら
ず、マルテンサイト組織の確保が困難となるので、１６
％を上限とすべきである。Cr: 10 to 16% Cr is indispensable for securing the yield strength and tensile strength of the alloy, and its addition is an element effective in improving the corrosion resistance of the alloy. At least 10% is required to achieve this effect. On the other hand, the addition of a large amount not only disadvantageously increases the cost, but also makes it difficult to secure a martensite structure.
% Should be capped.
【００１１】Ｍｏ：１〜６％ Ｍｏは、合金の耐力、引張強度の改善のために、１％以
上の添加を必要とする。添加増量に伴つてその効果を増
すが、反面靱性、伸び、絞り等の低下を招くので、６％
までとする。Mo: 1 to 6% Mo needs to be added in an amount of 1% or more in order to improve the yield strength and tensile strength of the alloy. The effect increases with the increase in the amount of addition, but on the other hand, the toughness, elongation, reduction of drawing, etc. are caused.
Up to.
【００１２】Ｃｏ：１０〜１５％ Ｃｏは、合金の耐力、引張強度の向上に有効な元素であ
る。この効果を十分ならしめるため、１０％を下限とす
る。しかし、多量の添加は合金の靱性の確保を困難とす
るので、１５％を上限とする。Co: 10 to 15% Co is an element effective for improving the yield strength and tensile strength of the alloy. To make this effect sufficient, the lower limit is 10%. However, since addition of a large amount makes it difficult to secure the toughness of the alloy, the upper limit is set to 15%.
【００１３】Ｖ：０．２〜０．５％ Ｖは、合金の機械的諸特性、特に耐力、引張強度の向上
に奏効する元素であり、この効果を得るためには、０．
２％以上の添加を必要とするが、その増量に伴つて合金
の靱性の低下をきたすので、０．５％を越えてはならな
い。V: 0.2-0.5% V is an element which is effective in improving the mechanical properties of the alloy, particularly, the yield strength and tensile strength.
Addition of 2% or more is required, but the addition should not exceed 0.5% because the toughness of the alloy decreases with the increase in the amount.
【００１４】Ｃｕ：０．５〜５％ Ｃｕは合金の母相にリツチ相を析出して合金の耐力、引
張強さを高める。その効果は０．５％以上の添加により
現れる。好ましくは１％以上である。しかし、多量に添
加すると、合金の靱性の低下が大きくなるので、５％を
上限とする。Cu: 0.5% to 5% Cu precipitates a rich phase in the parent phase of the alloy to increase the yield strength and tensile strength of the alloy. The effect appears by adding 0.5% or more. It is preferably at least 1%. However, if added in a large amount, the toughness of the alloy is greatly reduced, so the upper limit is 5%.
【００１５】本発明合金の不純分として付随するＰ，Ｓ
等の元素は、通常の溶製技術上不可避的に混入する量、
例えばＰは０．０３％以下、Ｓは０．０３％以下の範囲
であれば、本発明の趣旨が損なわれることはない。P, S accompanying impurities of the alloy of the present invention
Elements are inevitably mixed in the usual smelting technology,
For example, if P is 0.03% or less and S is 0.03% or less, the gist of the present invention is not impaired.
【００１６】本発明合金は、調質熱処理として、溶体化
熱処理、サブゼロ処理、および時効処理が施されて、マ
ルテンサイトを母相として、Ｃｒ，Ｍｏ，Ｖ等の炭化
物、およびＦｅ，Ｃｏ，Ｃｒ，Ｍｏ等からなる金属間化
合物相や規則格子相等が微細に分散析出した組織が与え
られる。溶体化熱処理は、温度１０００〜１１５０℃に
加熱保持したのち、急冷（強制空冷が適当である）する
ことにより行われる。加熱保持時間は、肉厚１インチ当
り１〜２Ｈｒ（例えば肉厚２インチのものでは、２〜４
Ｈｒ）を目安として設定すればよい。The alloy of the present invention is subjected to a solution heat treatment, a subzero treatment, and an aging treatment as a heat treatment heat treatment. The martensite is used as a matrix and carbides such as Cr, Mo, V, and Fe, Co, Cr. , Mo, or the like, and a structure in which an intermetallic compound phase or ordered lattice phase is finely dispersed and precipitated is provided. The solution heat treatment is performed by heating and maintaining the temperature at 1000 to 1150 ° C. and then rapidly cooling (forced air cooling is appropriate). The heating and holding time is 1 to 2 hours per inch of thickness (for example, 2 to 4
Hr) may be set as a guide.
【００１７】溶体化熱処理につづいてサブゼロ処理を施
し、合金の母相をマルテンサイト化する。そのサブゼロ
処理は、温度−１４０〜−１９０℃の冷媒中に適当時間
（１〜２Ｈｒ／ｉｎｃｈ肉厚、としてよい）保持するこ
とにより行われる。サブゼロ処理後の時効処理は、４０
０〜６５０℃の温度域に、一定時間（１〜２Ｈｒ／ｉｎ
ｃｈ肉厚、が適当である）保持した後、空冷することに
より首尾よく達成される。Subsequent to the solution heat treatment, a sub-zero treatment is performed to convert the parent phase of the alloy into martensite. The sub-zero treatment is carried out by holding in a refrigerant at a temperature of −140 to −190 ° C. for an appropriate time (the thickness may be 1 to 2 Hr / inch). The aging process after the sub-zero process is 40
In a temperature range of 0 to 650 ° C. for a certain time (1 to 2 Hr / in
(The wall thickness of the channel is appropriate).
【００１８】本発明の合金は、例えばシリンダ類等では
遠心力鋳造管等の鋳造品として、またスクリユーシヤフ
ト等では熱間塑性加工品として供給され、あるいはその
合金粉末（アトマイズ粉末等）を焼結原料とする熱間静
水等方加圧焼結法等による焼結合金製品として実使用に
供される。The alloy of the present invention is supplied, for example, as a cast product such as a centrifugal casting tube in cylinders or the like, or as a hot plastic processed product in a screw shaft or the like, or is sintered from an alloy powder (atomized powder or the like). It is actually used as a sintered alloy product by the hot isostatic pressing sintering method or the like as a binding raw material.
【００１９】本発明合金は、その化学組成と金属組織と
に基づく材料特性として高強度、高靱性を有しているほ
か、耐摩耗性や耐食性についても窒化鋼と同等ないしそ
れ以上の特性を備えているが、プラスチツク成形機部材
の用途において、エンジニアリングプラスチツクの複合
化、例えばガラス繊維やセラミツクス繊維等が混練さ
れ、あるいは離燃剤としてハロゲン化物等が混練される
プラスチツク成形操業のように、部材表面に混練物質に
よる強度の摩耗や腐食が加重される使用環境に供する場
合には、本発明合金を母材とし、その表面に、耐食・耐
摩耗合金からなるライニング層を形成して積層体（クラ
ツド部品）とすることにより、高強度・高靱性と共に、
高耐摩耗性・高耐食性を充足兼備させることができる。
その積層形成は溶射法や熱間静水等方加圧焼結法等の公
知の手法を適用すればよい。The alloy of the present invention has high strength and high toughness as material properties based on its chemical composition and metal structure, and also has abrasion resistance and corrosion resistance equal to or higher than those of nitrided steel. However, in the application of plastic molding machine members, in the composite molding of engineering plastics, for example, a plastic molding operation in which glass fibers or ceramic fibers are kneaded, or a halide or the like is kneaded as a flame release agent, the surface of the member is formed. When used in an environment in which the wear and corrosion of the kneading substance are intensified, the alloy of the present invention is used as a base material, and a lining layer made of a corrosion and wear resistant alloy is formed on the surface of the base material to form a laminate (cladded part). ) With high strength and high toughness,
High wear resistance and high corrosion resistance can be satisfied.
A known method such as thermal spraying or hot isostatic pressing sintering may be applied for the lamination.
【００２０】[0020]
【実施例】高周波溶解合金溶湯を鋳造して得たブロック
（５０×５０×５０，mm）に調質熱処理を施して供試材
とする。表１に供試材の化学組成を示す。No.１は発明
例であり、比較例Ｎｏ.２およびＮｏ.３は、Ｃｕを含有
しない点で発明例（Ｎｏ.１）と相違している例、比較
例No.４は窒化鋼（ＪＩＳ Ｇ４２０２ ＳＡＣＭ６４
５相当市販品）である。発明例(Ｎｏ.１)および比較例
Ｎｏ.２，Ｎｏ.３における溶体化熱処理は、１１００℃
±１０℃×３Ｈｒ・強制空冷、サブゼロ処理は、−１５
０℃±１０℃×３Ｈｒ、時効処理は、５００℃±１０℃
×３Ｈｒ・空冷とし、Ｎｏ.４（窒化鋼）の調質熱処理
は、９００℃±１０℃×３Ｈｒ・炉冷→７５０℃±１０
℃×３Ｈｒ・炉冷→５２０℃×７２Ｈｒ（Ｎ２雰囲気）
・炉冷とした。表２は各供試材の機械性質の測定結果を
示している。発明例（Ｎｏ.１）は、比較例Ｎｏ.４（窒
化鋼）と比べて、著しく高い強度を有している。なお、
発明例の延性（伸び，絞り）は、比較例のものと比べて
低いが、靭性は静荷重域ではるかに上廻っているので、
スクリュー等の比較的緩徐の回転トルクが負荷する部材
に対して従来材より有利に適用することができる。EXAMPLE A block (50 × 50 × 50, mm) obtained by casting a high-frequency molten alloy melt is subjected to a refining heat treatment to obtain a test material. Table 1 shows the chemical composition of the test materials. No.1 is invention
Comparative Examples No. 2 and No. 3 contain Cu.
Example that differs from Invention Example (No. 1) in that it does not
Example No. 4 is nitrided steel (JIS G4202 SACM64).
5 equivalent commercial product). Invention Example (No. 1) and Comparative Example
The solution heat treatment in No. 2 and No. 3 is 1100 ° C.
± 10 ℃ × 3Hr, forced air cooling, sub-zero treatment is -15
0 ℃ ± 10 ℃ × 3Hr, aging treatment is 500 ℃ ± 10 ℃
× 3Hr air cooling, No.4 (nitrided steel) tempering heat treatment is 900 ° C ± 10 ° C × 3Hr furnace cooling → 750 ° C ± 10
° C × 3Hr ・ furnace cooling → 520 ° C × 72Hr (N 2 atmosphere)
・ The furnace was cooled. Table 2 shows the measurement results of the mechanical properties of each test material. Invention Example (No.1), compared with Comparative Example No.4 (nitrided steel), which have a significantly higher strength. In addition,
The ductility (elongation, drawing) of the invention example is smaller than that of the comparative example.
Although low, the toughness is much higher in the static load range,
The present invention can be applied more advantageously to members to which relatively slow rotational torque is applied, such as screws, than conventional materials.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【発明の効果】本発明の析出硬化型ステンレス合金は、
高い強度と高い靱性を併せ有しているので、プラスチツ
ク成形機等の構成部材料として有用であり、特に高射出
成形圧力や高い混練トルクが負荷するエンジニアリング
プラスチツクの成形操業における部材の耐久性を高め、
成形操業の安定化に有効である。本発明の合金は、プラ
スチツク成形機部材のみならず、高強度と高靱性が要求
される各種用途における構造材料として有用である。The precipitation hardening stainless steel alloy of the present invention
Since it has both high strength and high toughness, it is useful as a component material for plastic molding machines, etc., and in particular, increases the durability of members in the molding operation of engineering plastics subjected to high injection molding pressure and high kneading torque. ,
It is effective for stabilizing the molding operation. The alloy of the present invention is useful as a structural material not only for a plastic molding machine member but also for various uses requiring high strength and high toughness.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−119649（ＪＰ，Ａ) 特開 昭52−150323（ＪＰ，Ａ) 特開 昭51−49114（ＪＰ，Ａ) 特公 昭51−29849（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) C22C 38/00 302 C22C 38/52 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-119649 (JP, A) JP-A-52-150323 (JP, A) JP-A-51-49114 (JP, A) 29849 (JP, B2) (58) Fields investigated (Int. Cl. 6 , DB name) C22C 38/00 302 C22C 38/52
Claims (1)
５〜１．２％，Ｍｎ：０．２〜１％，Ｎｉ：１．５〜
９．５％，Ｃｒ：１０〜１６％，Ｍｏ：１〜６％，Ｃ
ｏ：１０〜１５％，Ｖ：０．２〜０．５％，Ｃｕ：０．
５〜５％，残部実質的にＦｅからなる、プラスチック成
形機用高強度高靭性析出硬化型ステンレス合金。1. C: 0.05-0.25%, Si: 0.
5 to 1.2%, Mn: 0.2 to 1%, Ni: 1.5 to
9.5%, Cr: 10 to 16%, Mo: 1 to 6%, C
o: 10 to 15%, V: 0.2 to 0.5%, Cu: 0.
5-5%, balance substantially consisting of Fe, plastic
High strength, high toughness precipitation hardening stainless steel alloy for forming machines .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24584392A JP2955731B2 (en) | 1992-08-20 | 1992-08-20 | High-strength, high-toughness precipitation-hardening stainless steel alloy for plastic molding machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24584392A JP2955731B2 (en) | 1992-08-20 | 1992-08-20 | High-strength, high-toughness precipitation-hardening stainless steel alloy for plastic molding machines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0665692A JPH0665692A (en) | 1994-03-08 |
| JP2955731B2 true JP2955731B2 (en) | 1999-10-04 |
Family
ID=17139681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24584392A Expired - Fee Related JP2955731B2 (en) | 1992-08-20 | 1992-08-20 | High-strength, high-toughness precipitation-hardening stainless steel alloy for plastic molding machines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2955731B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7235212B2 (en) * | 2001-02-09 | 2007-06-26 | Ques Tek Innovations, Llc | Nanocarbide precipitation strengthened ultrahigh strength, corrosion resistant, structural steels and method of making said steels |
| CA2361180A1 (en) * | 2000-11-03 | 2002-05-03 | Michael M. Antony | Thermal fatigue resistant stainless steel articles |
| JP4732694B2 (en) * | 2002-02-08 | 2011-07-27 | ケステック イノベーションズ エルエルシー | Nanocarbide precipitation strengthened ultra high strength corrosion resistant structural steel |
| EP1722000A1 (en) * | 2005-05-12 | 2006-11-15 | Gainsmart Group Limited, a Corporation of the British Virgin Islands with offices at: | High strength stainless chromium-nickel steel without aluminium and titanium, and method for making same |
| EP1722001A1 (en) * | 2005-05-12 | 2006-11-15 | Gainsmart Group Limited, a Corporation of the British Virgin Islands with offices at: | High strength weathering nickel-cobalt-steel without aluminium and titanium and method for making same |
| US7985304B2 (en) | 2007-04-19 | 2011-07-26 | Ati Properties, Inc. | Nickel-base alloys and articles made therefrom |
-
1992
- 1992-08-20 JP JP24584392A patent/JP2955731B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0665692A (en) | 1994-03-08 |
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| LAPS | Cancellation because of no payment of annual fees |