JPS6315342B2 - - Google Patents
Info
- Publication number
- JPS6315342B2 JPS6315342B2 JP59126068A JP12606884A JPS6315342B2 JP S6315342 B2 JPS6315342 B2 JP S6315342B2 JP 59126068 A JP59126068 A JP 59126068A JP 12606884 A JP12606884 A JP 12606884A JP S6315342 B2 JPS6315342 B2 JP S6315342B2
- Authority
- JP
- Japan
- Prior art keywords
- less
- corrosion resistance
- present
- pin
- extruded
- 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
Links
- 238000001125 extrusion Methods 0.000 claims description 13
- 239000004033 plastic Substances 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 description 21
- 230000007797 corrosion Effects 0.000 description 21
- 230000007423 decrease Effects 0.000 description 6
- 239000003063 flame retardant Substances 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Heat Treatment Of Articles (AREA)
Description
本発明は、耐食性の優れたプラスチツク成形型
用の押出ピンに関するものであり、特に難燃性プ
ラスチツク型成形装置用のステンレス押出ピンに
関するものである。
プラスチツク用押出ピンとしては、一般に、使
用中折損しないよう充分の強靭性を有すること、
摺動面の耐摩耗性の大きいこと、耐食性の良好な
こと、使用中に寸法変化を生じないことなどの性
質が要求される。
従来、プラスチツク用押出ピンとしては
SKS21、SKD11などの高炭素工具鋼をHrC60前
後の硬さに焼入・焼戻ししたものが広く用いられ
てきたが、プラスチツクの用途が拡大され、難燃
性プラスチツクが電気、電子機器用に使用される
ようになつて、こらSKS21、SKD11製押出ピン
は耐食性が不足することが明らかとなつた。
難然性プラスチツクは、従来のプラスチツクに
ハロゲン化合物を主体とする難燃剤を添加してい
るため、射出成形時に塩素ガスなどのハロゲン系
腐食ガスを発生し、押出ピンを腐食させるという
問題を生ずるようになつた。
腐食対策として、SUS420J2、SUS440Cなどの
マルテンサイト系ステンレス鋼を焼入・焼きもど
しして、HrC48〜55の硬さに超室した押出しピン
が用いられているが、耐食性が完全ではなく、ピ
ツト状の腐食が発生するので、充分な対策とはい
えない。
本発明は、これらの問題に鑑みてなされたもの
であり、従来の押出ピンよりも耐食性が優れてお
り、耐摩耗性も良好であり、難燃性プラスチツク
用として有効に使用できるステンレス製のプラス
チツク成形型用押出ピンを提供することを目的と
するものである。
すなわち、本発明は重量％で、C0.8〜1.2％、
Si1.0％以下、Mn1.0％以下、Cr13.0〜16.0％、
Mo3.0〜4.5％、V0.15％以下、残部鉄および若干
の不純物を含む鋼より成る耐食性の優れたプラス
チツク成形型用の押出ピンであり、上述の組成の
鋼の棒材を所定の形状に加工したのち、1020〜
1050℃から焼入れ、引続いて−70℃以下の温度で
サブゼロ処理をし、更に510〜530℃で焼戻しを施
したものであり、ハロゲン系腐食ガスに対する耐
食性が優れていると同時に、耐摩耗性も非常に良
好である。
次に本発明押出ピンの組成限定理由を述べる。
Ｃはマルテンサイト中に固溶して基地の硬さを高
くし、また、硬い炭化物を形成して耐摩耗性を向
上するが、0.8％未満では耐摩耗性が不足し、ま
た1.2％をこえると靭性が低下するので、0.8〜1.2
％とした。Siは脱酸剤として添加するが、１％を
こえると靭性が低下するので1.0％以下とした。
Mn脱酸剤として添加するが、１％をこえると焼
入時の残留オーステナイトが増加して焼入硬度が
低下するので1.0以下とした。Crは耐食性、耐熱
性、耐摩耗性の向上に有効であるが、Cr13％未
満では耐食性が不充分であり、また16％をこえる
と靭性が低下するので13.0〜16.0％とした。Mo
は耐食性を向上し、又耐熱性、耐摩耗性も向上す
るが、3.0％未満では耐食性が不足し、また4.5％
をこえると靭性が低下するので、3.0〜4.5％とし
た。Ｖは形晶粒を微細化して靭性を向上するが、
0.15％をこえると耐食性を低下するので、0.15％
以下に限定した。以上の合金組成を備えた本発明
の鋼は、1020〜1050℃焼入状態で約20％の残留オ
ーステナイトを有するため、−70℃以下でサブゼ
ロ処理をし、さらに520〜540℃で焼戻しを行なつ
て、残留オーステナイトを分解させ、160〜250℃
の温度で使用中に寸法変化を生じないようにして
おく必要がある。
次に、本発明の実施例を具体的に説明する。第
１表に本発明に係る押出ピンと従来製押出ピンの
化学組成を示す。表中、記号A1、A2、A3はは本
発明に係る押出ピン、記号ＢはSUS440C製押出
ピン、記号ＢはSUS420J2製押出ピンである。
第２表は、押出ピンの熱処理硬さ、ならびに耐
食性の比較を示したものである。本発明ピンA1、
A2、A3は、1030ガス冷却後、−76℃1h（時間）の
サブゼロ処理を行ない、さらに520℃×2h（時間）
焼戻しを施した。硬さは、HrC60を示した。
The present invention relates to an extrusion pin for plastic molds with excellent corrosion resistance, and particularly to a stainless steel extrusion pin for use in flame-retardant plastic mold molding equipment. Generally speaking, extrusion pins for plastics must have sufficient toughness so as not to break during use.
Properties such as high wear resistance on the sliding surface, good corrosion resistance, and no dimensional changes during use are required. Conventionally, as an extrusion pin for plastics,
High carbon tool steels such as SKS21 and SKD11 that have been quenched and tempered to a hardness of around HrC60 have been widely used, but the uses of plastics have expanded and flame-retardant plastics are being used for electrical and electronic equipment. It became clear that the extruded pins made of SKS21 and SKD11 lacked corrosion resistance. Refractory plastics are made by adding flame retardants, mainly halogen compounds, to conventional plastics, so they generate halogen-based corrosive gases such as chlorine gas during injection molding, which can cause problems such as corrosive extrusion pins. It became. As a countermeasure against corrosion, extruded pins made of martensitic stainless steel such as SUS420J2 and SUS440C are hardened and tempered to a hardness of HrC48 to 55, but they are not completely corrosion resistant and have a pit-like shape. This is not a sufficient countermeasure as corrosion will occur. The present invention was made in view of these problems, and provides a stainless steel plastic that has better corrosion resistance and wear resistance than conventional extruded pins, and can be effectively used for flame-retardant plastics. The object of the present invention is to provide an extrusion pin for a mold. That is, the present invention has C0.8 to 1.2% by weight,
Si1.0% or less, Mn1.0% or less, Cr13.0-16.0%,
This is an extrusion pin for plastic molds with excellent corrosion resistance, which is made of steel with Mo3.0~4.5%, V0.15% or less, and the balance iron and some impurities. After processing, 1020~
It is quenched at 1050℃, then subjected to sub-zero treatment at a temperature below -70℃, and then tempered at 510 to 530℃, and has excellent corrosion resistance against halogen-based corrosive gases, as well as excellent wear resistance. is also very good. Next, the reasons for limiting the composition of the extrusion pin of the present invention will be described.
C solidly dissolves in martensite and increases the hardness of the base, and also forms hard carbides to improve wear resistance, but if it is less than 0.8%, the wear resistance is insufficient, and if it exceeds 1.2%. and the toughness decreases, so 0.8 to 1.2
%. Si is added as a deoxidizing agent, but if it exceeds 1%, the toughness decreases, so it is kept at 1.0% or less.
Mn is added as a deoxidizing agent, but if it exceeds 1%, residual austenite during quenching increases and quenching hardness decreases, so it was set to 1.0 or less. Cr is effective in improving corrosion resistance, heat resistance, and abrasion resistance, but if it is less than 13%, corrosion resistance is insufficient, and if it exceeds 16%, toughness decreases, so it is set to 13.0 to 16.0%. Mo
improves corrosion resistance, as well as heat resistance and wear resistance, but less than 3.0% results in insufficient corrosion resistance;
If it exceeds this, the toughness decreases, so it was set at 3.0 to 4.5%. V refines the shape grains and improves toughness, but
If it exceeds 0.15%, corrosion resistance will decrease, so 0.15%
Limited to the following. The steel of the present invention with the above alloy composition has approximately 20% residual austenite when quenched at 1020-1050°C, so it is subjected to sub-zero treatment at -70°C or lower and then tempered at 520-540°C. The remaining austenite is decomposed and heated to 160 to 250℃.
It is necessary to ensure that dimensional changes do not occur during use at a temperature of Next, examples of the present invention will be specifically described. Table 1 shows the chemical compositions of the extrusion pin according to the present invention and the conventional extrusion pin. In the table, symbols A 1 , A 2 , and A 3 are extruded pins according to the present invention, symbol B is an extruded pin made of SUS440C, and symbol B is an extruded pin made of SUS420J2. Table 2 shows a comparison of the heat treatment hardness and corrosion resistance of the extruded pins. Invention pin A 1 ,
For A 2 and A 3 , after cooling with 1030 gas, sub-zero treatment was performed at -76℃ for 1 hour (hour), and then at 520℃ x 2 hours (hour).
Tempered. The hardness showed HrC60.
【表】【table】
【表】
これらのピンの耐食性の比較を行なうため、押
出ピンと同じ条件で製作したφ6mm×50mm試片を
用いて腐食試験を行なつた。即ち、５℃の５％
H2SO4水溶液、５％HCl及び５％HF（20℃）水溶
液中に試片を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、本発明に係る押出ピ
ンA1、A2、A3は、記号ＢおよびＣよりも、著し
く優れた耐食性を示すことが理解できる。またハ
ロゲンガスによるピツト状腐食の状況をテストし
た結果を第３表に示す。本発明の押出ピンA1、
A2、A3は５万シヨツトを経過しても何ら変化を
生じなかつた。
以上、説明した如く、本発明は、C0.8〜1.2％、
Si1.0％以下、Mn1.0％以下、Cr13.0〜16.0％、
Mo3.0〜4.5％、V0.15％以下、残部鉄および若干
の不純物より成る鋼の押出ピンであるから耐摩耗
性、寸法安定性が良好であり、また、塩酸ならび
に硫酸に対する耐食性が良好であるので、難燃性
プラスチツクの成形型用押出ピンとして好適であ
る。[Table] In order to compare the corrosion resistance of these pins, a corrosion test was conducted using a φ6 mm x 50 mm specimen manufactured under the same conditions as the extruded pin. i.e. 5% of 5℃
Corrosion loss was measured by immersing the specimen in an aqueous solution of H 2 SO 4 , 5% HCl, and 5% HF (20° C.). The results are shown in Table 2, and it can be seen that the extruded pins A 1 , A 2 , and A 3 according to the present invention exhibit significantly better corrosion resistance than the pins B and C. Furthermore, Table 3 shows the results of testing for pit-like corrosion caused by halogen gas. Extrusion pin A 1 of the present invention,
A 2 and A 3 did not change at all even after 50,000 shots. As explained above, the present invention has C0.8 to 1.2%,
Si1.0% or less, Mn1.0% or less, Cr13.0-16.0%,
The extruded steel pin is made of Mo3.0~4.5%, V0.15% or less, the balance is iron and some impurities, so it has good wear resistance and dimensional stability.It also has good corrosion resistance against hydrochloric acid and sulfuric acid. Therefore, it is suitable as an extrusion pin for flame-retardant plastic molds.
【表】【table】
Claims (1)
Mn1.0％以下、Cr13.0〜16.0％、Mo3.0〜4.5％、
V0.15％以下、残部鉄および若干の不純物を含む
鋼より成るプラスチツク成形型用押出ピン。1% by weight, C0.8-1.2%, Si1.0% or less,
Mn1.0% or less, Cr13.0~16.0%, Mo3.0~4.5%,
Extrusion pin for plastic molds made of steel with V0.15% or less, balance iron and some impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12606884A JPS616252A (en) | 1984-06-19 | 1984-06-19 | Stainless steel ejector pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12606884A JPS616252A (en) | 1984-06-19 | 1984-06-19 | Stainless steel ejector pin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS616252A JPS616252A (en) | 1986-01-11 |
| JPS6315342B2 true JPS6315342B2 (en) | 1988-04-04 |
Family
ID=14925819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12606884A Granted JPS616252A (en) | 1984-06-19 | 1984-06-19 | Stainless steel ejector pin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS616252A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57161051A (en) * | 1981-03-31 | 1982-10-04 | Daido Steel Co Ltd | Steel for plastic mold |
-
1984
- 1984-06-19 JP JP12606884A patent/JPS616252A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57161051A (en) * | 1981-03-31 | 1982-10-04 | Daido Steel Co Ltd | Steel for plastic mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS616252A (en) | 1986-01-11 |
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