JPH0232335B2 - - Google Patents
Info
- Publication number
- JPH0232335B2 JPH0232335B2 JP59161172A JP16117284A JPH0232335B2 JP H0232335 B2 JPH0232335 B2 JP H0232335B2 JP 59161172 A JP59161172 A JP 59161172A JP 16117284 A JP16117284 A JP 16117284A JP H0232335 B2 JPH0232335 B2 JP H0232335B2
- Authority
- JP
- Japan
- Prior art keywords
- less
- corrosion resistance
- nozzle
- hastelloy
- 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.)
- Expired - Lifetime
Links
- 238000005260 corrosion Methods 0.000 claims description 19
- 230000007797 corrosion Effects 0.000 claims description 19
- 238000001746 injection moulding Methods 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 10
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical compound [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 230000032683 aging Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229920002313 fluoropolymer Polymers 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/20—Injection nozzles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
本発明は、耐食性の優れたふつ素樹脂射出成形
用ノズルに関するものである。
プラスチツク射出成形機においては、加熱して
融解した樹脂を高圧で、ノズルを通して金型中に
押し出すため、ノズルには、使用中に変形しない
よう充分な強度を有すること、耐摩擦性の大きい
こと、耐食性の良好なことなどの性質が要され
る。
従来、プラスチツク射出成形機のノズルは、主
として窒化鋼SACM１や熱間ダイス鋼SKD61に
窒化処理をほどこしたものが使用されており、ま
たSKD１１やSKH９なども用いられているが、
プラスチツクの用途が拡大されて、テフロンなど
のふつ素樹脂が使用されるようになつて、これら
の鋼種では耐食性が不足することが明らかとなつ
た。
ふつ素樹脂成形においては、成形時に、ふつ化
水素を発生するため、高度の耐食性が要求される
ので、ふつ素樹脂成形用ノズルとしては、Ni基
耐熱合金であるハステロイＣが用いられている。
ハステロイＣは、55％Ni、17％Mo、15％Cr、
４％Ｗ、５％Fe、0.3％Ｖを含有する合金であり、
ふつ酸（HF）に対する耐食性は非常に良好であ
るが、硬さがHRC14と低く、強度が不足するの
で、ノズルとして使用した場合には、使用中に変
形したり、また早期に摩耗する欠点がある。
本発明は、これらの問題に鑑みてなされたもの
であり、ふつ酸に対する耐食性がハステロイＣと
ほぼ同等であり、しかも硬さがHRC36以上に析出
硬化するノズルを提供することを目的とするもの
である。
即ち、本発明は重量％でC0.05〜0.20％、Si0.5
％以下、Mn1.0％以下、Cr14.0〜22.0％、Co8.0〜
12.0％、Mo8.0〜12.0％、Al0.75〜1.5％、Ti2.0〜
3.0％、Fe5.0％以下、残部Ni及び若干の不純物よ
りなるふつ素樹脂射出成形用ノズルであり、前記
組成の合金の棒材を溶体化処理状態で加工して所
定の形状にした後、760℃前後の温度で時効処理
を行なつてHRC36以上の硬さに析出硬化させるこ
とによりふつ酸に対する耐食性が良好であり、強
度並びに耐摩耗性も大きいという特徴を有するも
のである。
次に、本発明に係るノズルの組成限定理由を述
べる。
Ｃは、オーステナイト中に固溶するとともに、
Cr、Mo、Tiなどと炭化物を形成するが、Ｃが
0.05％未満では強度が不足し、また0.20％をこえ
ると靭性が低下するので0.05％〜0.20％とした。
Siは脱酸剤として添加するが、0.5％をこえると
鞁性を低下するので0.5％以下とした。Mnもまた
脱酸剤として添加し、また熱間加工性を向上する
効果を有するが、1.0％をこえると耐食性を低下
するので、1.0％以下とした。Crは耐食性並びに
対酸化性を向上するが、14％未満ではその効果少
なく、また22％をこえると靭性を低下するので、
14.0〜22.0とした。Coは耐食性、耐熱性を向上
し、また析出硬化を促進する効果を有するが、８
％未満ではその効果少なく、また12％をこえると
靭性を低下するので8.0〜12.0％とした。Moは耐
食性を向上し、常温並びに高温強度を大きくする
が、8.0％未満ではその効果少なく、また12.0％
をこえると靭性を低下するので、8.0％〜12.0％
とした。Al及びTiは、Niと結合してNi3（Al、
Ti）の金属間化合物をつくり、析出硬化を生じ
させるが、Al及びTiが少なすぎ、ると時効硬さ
が低すぎ、またAl及びTiが多すぎると靭性を低
下させるので、Alは0.75〜1.5％に、またTiは2.0
〜3.0％に限定した。Feは加工性を向上させるた
めに添加するが、耐食性並びに強度をを低下させ
るので、5.0％以下に限定した。残部はNi及び若
干の不純物からなるが、Niは耐食性を向上し、
また強度を向上させる効果を有する。
以下、本発明を実施例によつて具体的に説明す
る。第１表は、本発明に係るノズルと従来製ノズ
ルの化学組成を示す。表中、記号Ａは本発明ノズ
ル、記号ＢはSACM1ノズル、また記号Ｃは、ハ
ステロイＣ合金の成分を示す。第２表はノズルに
施した熱処理び硬さ並びに５％ふつ酸（HF）
The present invention relates to a fluororesin injection molding nozzle with excellent corrosion resistance. In a plastic injection molding machine, heated and melted resin is extruded at high pressure through a nozzle into a mold, so the nozzle must have sufficient strength so as not to deform during use, and be highly abrasion resistant. Properties such as good corrosion resistance are required. Conventionally, nozzles for plastic injection molding machines have mainly been made of nitrided steel SACM1 or hot die steel SKD61 that has been nitrided, and SKD11 and SKH9 have also been used.
As the uses of plastics expanded and fluoroplastics such as Teflon came into use, it became clear that these steel types lacked corrosion resistance. In fluorine resin molding, hydrogen fluoride is generated during molding, so a high degree of corrosion resistance is required, so Hastelloy C, a Ni-based heat-resistant alloy, is used as a nozzle for fluorine resin molding. Hastelloy C is 55% Ni, 17% Mo, 15% Cr,
It is an alloy containing 4% W, 5% Fe, 0.3% V,
Although it has very good corrosion resistance against hydrofluoric acid (HF), it has a low hardness of H R C14 and lacks strength, so when used as a nozzle, it may deform during use or wear out prematurely. There are drawbacks. The present invention has been made in view of these problems, and aims to provide a nozzle that has almost the same corrosion resistance to hydrochloric acid as Hastelloy C, and is precipitation hardened to a hardness of H R C36 or higher. It is something. That is, the present invention has C0.05 to 0.20% and Si0.5% by weight.
% or less, Mn1.0% or less, Cr14.0~22.0%, Co8.0~
12.0%, Mo8.0~12.0%, Al0.75~1.5%, Ti2.0~
This is a fluoroplastic injection molding nozzle consisting of 3.0% Fe, 5.0% or less Fe, the balance Ni and some impurities, and after processing an alloy bar with the above composition into a predetermined shape in a solution treatment state, By performing aging treatment at a temperature of around 760°C and precipitation hardening to a hardness of H R C36 or higher, it has good corrosion resistance against hydrofluoric acid, and is characterized by high strength and wear resistance. Next, the reason for limiting the composition of the nozzle according to the present invention will be described. C is dissolved in solid solution in austenite, and
It forms carbides with Cr, Mo, Ti, etc., but C
If it is less than 0.05%, the strength will be insufficient, and if it exceeds 0.20%, the toughness will decrease, so it is set at 0.05% to 0.20%.
Si is added as a deoxidizing agent, but if it exceeds 0.5%, the solidity will decrease, so it was kept at 0.5% or less. Mn is also added as a deoxidizing agent and has the effect of improving hot workability, but if it exceeds 1.0%, corrosion resistance decreases, so it is set at 1.0% or less. Cr improves corrosion resistance and oxidation resistance, but if it is less than 14%, the effect is small, and if it exceeds 22%, toughness decreases.
It was set as 14.0 to 22.0. Co has the effect of improving corrosion resistance and heat resistance and promoting precipitation hardening, but 8
If it is less than 12%, the effect will be small, and if it exceeds 12%, the toughness will decrease, so it was set at 8.0 to 12.0%. Mo improves corrosion resistance and increases strength at room temperature and high temperature, but if it is less than 8.0%, the effect is small, and if it is less than 12.0%
If it exceeds 8.0% to 12.0%, the toughness decreases.
And so. Al and Ti combine with Ni to form Ni 3 (Al,
However, if there are too little Al and Ti, the aging hardness will be too low, and if there are too many Al and Ti, the toughness will decrease. 1.5% and Ti is 2.0
Limited to ~3.0%. Fe is added to improve workability, but it reduces corrosion resistance and strength, so it is limited to 5.0% or less. The remainder consists of Ni and some impurities, but Ni improves corrosion resistance,
It also has the effect of improving strength. Hereinafter, the present invention will be specifically explained with reference to Examples. Table 1 shows the chemical composition of the nozzle according to the present invention and the conventional nozzle. In the table, symbol A indicates the nozzle of the present invention, symbol B indicates the SACM1 nozzle, and symbol C indicates the component of the Hastelloy C alloy. Table 2 shows the heat treatment hardness and 5% hydrofluoric acid (HF) applied to the nozzle.
【表】【table】
【表】
水溶液に対する腐食試験結果を示す。本発明ノ
ズル記号Ａは、1060℃空冷の溶体化処理ではHR
C27に軟化したが、760℃×16h（時間）時効処理
によつてHRC39に析出硬化した。これに対し、記
号ＣのハステロイＣは、1200℃溶体化処理後の硬
さは、HRC14である。
腐食試験は、φ10×50mm試片を用い、20℃の５
％HF水溶液中に浸漬させて腐食減量を測定し
た。この結果は、第２表に示すが、記号Ａは、記
号ＣのハステロイＣと、ほぼ同等の優れた耐食性
を有することがわかる。
以上説明した如く、本発明はC0.05〜0.20％、
Si0.5％以下、Mn1.0％以下、Cr14.0〜22.0％、
Co8.0％〜12.0％、Mo8.0〜12.0％、Al0.75〜1.5
％、Ti2.0〜3.0％、Fe5％以下、残部Niおよび若
干の不純物からなり、ふつ酸に対する耐食性がハ
ステロイＣと同等に良好であり、強度並びに耐摩
耗性も大きいので、ふつ素樹脂射出成形機のノズ
ルとして好適のものである。[Table] Shows the results of corrosion tests for aqueous solutions. The nozzle symbol A of the present invention is H R
It softened to C27, but was precipitation hardened to H R C39 by aging treatment at 760°C for 16 hours. On the other hand, Hastelloy C with symbol C has a hardness of H R C14 after solution treatment at 1200°C. Corrosion tests were carried out using φ10×50mm specimens at 5°C at 20°C.
% HF aqueous solution and the corrosion loss was measured. The results are shown in Table 2, and it can be seen that the material with the symbol A has almost the same excellent corrosion resistance as the Hastelloy C with the symbol C. As explained above, the present invention has C0.05 to 0.20%,
Si0.5% or less, Mn1.0% or less, Cr14.0~22.0%,
Co8.0%~12.0%, Mo8.0~12.0%, Al0.75~1.5
%, Ti 2.0-3.0%, Fe 5% or less, balance Ni and some impurities.It has corrosion resistance to fluoric acids as good as Hastelloy C, and has high strength and wear resistance, so it is suitable for fluorine resin injection molding. It is suitable as a machine nozzle.
Claims (1)
Mn1.0％以下、Cr14.0〜22.0％、Co8.0〜12.0％、
Mo8.0〜12.0％、Al0.75〜1.5％、Ti2.0〜3.0％、
Fe5.0％以下、残部Ni及び若干の不純物よりなる
耐食性の優れたふつ素樹脂射出成形用ノズル。1% by weight, C0.05-0.20%, Si0.5% or less,
Mn1.0% or less, Cr14.0~22.0%, Co8.0~12.0%,
Mo8.0~12.0%, Al0.75~1.5%, Ti2.0~3.0%,
A fluorine resin injection molding nozzle with excellent corrosion resistance, consisting of less than 5.0% Fe, the balance being Ni and some impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16117284A JPS6140125A (en) | 1984-07-31 | 1984-07-31 | Nozzle for injection molding of fluororesin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16117284A JPS6140125A (en) | 1984-07-31 | 1984-07-31 | Nozzle for injection molding of fluororesin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6140125A JPS6140125A (en) | 1986-02-26 |
| JPH0232335B2 true JPH0232335B2 (en) | 1990-07-19 |
Family
ID=15729954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16117284A Granted JPS6140125A (en) | 1984-07-31 | 1984-07-31 | Nozzle for injection molding of fluororesin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6140125A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4866521A (en) * | 1971-12-15 | 1973-09-12 |
-
1984
- 1984-07-31 JP JP16117284A patent/JPS6140125A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4866521A (en) * | 1971-12-15 | 1973-09-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6140125A (en) | 1986-02-26 |
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