JPS6133073B2 - - Google Patents
Info
- Publication number
- JPS6133073B2 JPS6133073B2 JP7930781A JP7930781A JPS6133073B2 JP S6133073 B2 JPS6133073 B2 JP S6133073B2 JP 7930781 A JP7930781 A JP 7930781A JP 7930781 A JP7930781 A JP 7930781A JP S6133073 B2 JPS6133073 B2 JP S6133073B2
- Authority
- JP
- Japan
- Prior art keywords
- link chain
- plating
- link
- chain
- 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
Links
- 238000005260 corrosion Methods 0.000 claims description 13
- 230000007797 corrosion Effects 0.000 claims description 13
- 238000007747 plating Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229910052797 bismuth Inorganic materials 0.000 claims description 5
- 229910052745 lead Inorganic materials 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 238000005255 carburizing Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000005256 carbonitriding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000012943 hotmelt Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 7
- 238000011282 treatment Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Coating With Molten Metal (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Description
本発明は荷役機器としてのモートルブロツク及
びチエーンブロツクに係り、高強度高靭耐食性を
有するリンクチエーンの製造法に関する。
モートルブロツクあるいはチエーンブロツク
は、揚重機としての使命がある。これらに使用さ
れるリンクチエーンには荷物の吊り上げ、吊り下
げ動作において直接荷重が付加されると共に異常
な荷吊りにより、著しい応力が負荷される。この
ようなことからリンクチエーンには高強度を有す
ること、リンクチエーン接触部の摩耗に耐えうる
ために耐摩耗性に優れていること及び安全性か
ら、高強度及び耐摩耗性のほかに、靭性を有する
ことが要求される。他方、近年、食品、医療及び
漁業関係においては、強度のみならず耐食性に優
れたリンクチエーンを望んでいる。これに対して
耐食リンクチエーンとしては従来からステンレス
鋼製のリンクチエーンあるいは各種のめつき処理
特にクロームめつき処理を施したものが用いられ
ている。しかし、ステンレス鋼製では要求される
機能が十分得られないばかりでなく高価であると
いう欠点があり、まためつき製リンクチエーンに
おいては荷重が負荷された場合、チエーンは曲げ
応力が発生するのでめつき層と母層との間におい
て弾性歪に差異が生じ、めつき部が剥離し耐食性
の効果が著しく低下するという欠点があつた。
本発明の目的は、上述の欠点を無くした強靭で
耐摩耗性及び耐食性のあるリンクチエーンの製造
法を提供することにある。
本発明者らは、強靭で耐磨耗性かつ耐食性を有
するリンクチエーンを開発すべく種々研究してき
た結果、以下に示すような成分組成物の溶融めつ
き浴と製作工程において前記目的を達成できるこ
とを見出した。すなわち鉄鋼材料からなるリンク
チエーンに浸炭または浸炭窒化処理を施し、その
雰囲気のまま重量でSn：55〜75％、Pb：15〜30
％、Zn：１〜10％及びBi：１〜15％からなる組
成の250℃以下の溶融めつき浴中に直接挿入冷却
することによつて、強靭で耐摩耗性を有するリン
クチエーンが得られることを見出した。ここで溶
融浴の組成を重量％でSn：55〜75％、Pb：15〜
30％、Zn：１〜10％及びBi：１〜15％とし、且
つ浴の温度を250℃以下としたのは、250℃以上で
はこれらの組成の溶融浴では焼入冷却効果及びリ
ンクチエーンとしての所定の強度と耐摩耗性が得
られないためである。この組成では最低凝固点が
160〜185℃のためこれ以下では、当然めつきと冷
却効果がない。上記組成範囲としたのは、第１に
Sn、Bi、Pb、Znの４元素の相乗効果により融点
を約160〜185℃まで低下させることができ、浸
炭、浸炭窒化及び通常の焼入温度から本溶融浴に
挿入冷却することによつて、リンクチエーンの焼
入効果が十分得られることにある。これ以外の組
成では融点が高くなりすぎ、焼入効果が十分に得
られない。第２に本溶融浴中にリンクチエーンを
挿入することによつて、溶融浴がリンクチエーン
表面に付着し、これが耐食性に著しい効果を与え
ることにある。
実施例
化学組成が重量％でＣ：0.21％、Si：0.21％、
Mn：1.40％、Ｐ：0.013％、Ｓ：0.011％、Ｂ：
0.0026％及び微量のTi、Alを含み、残部がFeか
らなる合金で作られた線径7.1mmφのリンクチエ
ーンについて種々の実験を行つた。第１〜３図に
おいて１は本発明法すなわち830℃×20分浸炭
後、その雰囲気を保持したまま重量％でSn：
60、Pb：20％、Zn：９％、Bi：11％から成る組
成の215℃溶融溶中に30分挿入し冷却したもので
ある。２は従来より行われている870℃×20分浸
炭後油冷し、次いで200℃で焼もどし処理したも
のである。３は２の処理後Sn浴中にドブ漬けめ
つきしたものである。４はSUS304で作られたも
のである。
第１図は上記４種類についての引張試験結果で
ある。これより明らかなように、本発明によつて
作られた１及び従来例の２のものは引張強さ伸び
ともに優れ、最も強靭であることがわかる。
第２図はリンクチエーンの片振り疲れ試験結果
である。疲れ強さにおいても、本発明品１は他の
めつき処理したもの３及びSUS304製の４に比べ
高い強さを示すことがわかる。
第３図は定格荷重1tonのモートルブロツクの実
機を用いリンクチエーンの摩耗試験を行つたもの
で条件は乾燥（dry）雰囲気である。摩耗試験の
結果は１及び２は、ばらつき範囲でほぼ同じ値を
示しているが、耐食性を有する３及び４のものよ
り著しく優れていることがわかる。
次に耐食性評価として、塩化噴霧試験を行つた
結果、本発明品１とステンレス鋼製４は、20時間
でも赤錆の発生は見られなかつたが、２は１時間
以内で赤錆を発生し、また３は５〜20時間の間で
赤錆を発生した。
表は各種の性能試験結果について総合評価たも
のである。この結果、本発明品は各項目の性能に
おいても最も優れており、強靭かつ耐食性に優れ
ていることがわかる。
The present invention relates to a motor block and a chain block as cargo handling equipment, and more particularly to a method for manufacturing a link chain having high strength, toughness, and corrosion resistance. A motor block or chain block has a mission as a lifting machine. Direct loads are applied to the link chains used in these operations during the lifting and hanging operations of loads, and significant stress is also applied due to abnormal load lifting. For this reason, in addition to high strength and wear resistance, link chains must have high strength, excellent wear resistance because they can withstand wear at the link chain contact parts, and safety. It is required to have the following. On the other hand, in recent years, link chains that are not only strong but also have excellent corrosion resistance are desired in the food, medical, and fisheries fields. On the other hand, as corrosion-resistant link chains, link chains made of stainless steel or those subjected to various plating treatments, particularly chrome plating treatments, have been used. However, stainless steel has the disadvantage that it not only does not provide the required functions, but is also expensive, and when a load is applied to a link chain made of stainless steel, bending stress is generated in the chain, so it is difficult to use. There was a disadvantage that a difference in elastic strain occurred between the plating layer and the base layer, and the plating portion peeled off, resulting in a significant decrease in the corrosion resistance effect. The object of the present invention is to provide a method for manufacturing a strong, wear-resistant and corrosion-resistant link chain that eliminates the above-mentioned drawbacks. The present inventors have conducted various studies to develop a link chain that is strong, wear resistant, and corrosion resistant, and have found that the above objective can be achieved using a melt plating bath and manufacturing process with the component composition shown below. I found out. In other words, a link chain made of steel material is carburized or carbonitrided, and in that atmosphere, Sn: 55 to 75% and Pb: 15 to 30% by weight.
%, Zn: 1 to 10%, and Bi: 1 to 15% by directly inserting and cooling into a melt plating bath at 250°C or less, a link chain that is strong and wear resistant can be obtained. I discovered that. Here, the composition of the molten bath is determined by weight%: Sn: 55~75%, Pb: 15~
30%, Zn: 1 to 10%, and Bi: 1 to 15%, and the bath temperature was set to 250°C or lower because, at 250°C or higher, molten baths with these compositions have a hardening effect due to quenching and a link chain. This is because the specified strength and wear resistance cannot be obtained. This composition has a minimum freezing point of
Since it is 160 to 185 degrees Celsius, if it is below this temperature, plating and cooling effects will naturally be lost. The above composition range was chosen for the first reason.
Due to the synergistic effect of the four elements Sn, Bi, Pb, and Zn, the melting point can be lowered to approximately 160-185℃, and by inserting it into the main molten bath and cooling it from the carburizing, carbonitriding, and normal quenching temperatures. , the link chain can be sufficiently hardened. If the composition is other than this, the melting point will be too high and a sufficient hardening effect will not be obtained. Second, by inserting the link chain into the molten bath, the molten bath adheres to the surface of the link chain, which has a significant effect on corrosion resistance. Example Chemical composition is C: 0.21%, Si: 0.21%,
Mn: 1.40%, P: 0.013%, S: 0.011%, B:
Various experiments were conducted on a link chain with a wire diameter of 7.1 mm made of an alloy containing 0.0026% and trace amounts of Ti and Al, with the remainder being Fe. In Figs. 1 to 3, 1 is the method of the present invention, that is, after carburizing at 830°C for 20 minutes, Sn:
60, Pb: 20%, Zn: 9%, Bi: 11% was inserted into a 215° C. melt for 30 minutes and cooled. No. 2 was carburized at 870°C for 20 minutes, oil-cooled, and then tempered at 200°C. No. 3 was soaked in a Sn bath after the treatment in No. 2. 4 is made of SUS304. FIG. 1 shows the tensile test results for the four types mentioned above. As is clear from this, Sample No. 1 made according to the present invention and Sample No. 2 of the conventional example are excellent in both tensile strength and elongation, and are the strongest. Figure 2 shows the results of a link chain oscillation fatigue test. In terms of fatigue strength, it can be seen that product 1 of the present invention exhibits higher strength than other plated products 3 and 4 made of SUS304. Figure 3 shows a link chain wear test conducted using an actual motor block with a rated load of 1 ton, and the conditions were a dry atmosphere. The results of the abrasion test show that No. 1 and No. 2 have almost the same values within the variation range, but they are significantly superior to No. 3 and No. 4, which have corrosion resistance. Next, as a corrosion resistance evaluation, we conducted a chloride spray test and found that product 1 of the present invention and product 4 made of stainless steel did not develop red rust even after 20 hours, but product 2 developed red rust within 1 hour. No. 3 developed red rust within 5 to 20 hours. The table shows a comprehensive evaluation of various performance test results. As a result, it can be seen that the product of the present invention has the best performance in each item, and has excellent toughness and corrosion resistance.
【表】
（○良、△やや良、×悪い）
第４図に本発明品の製造工程と耐食性を賦与す
るためにめつき処理を施していた従来の製作工程
を示すが、製造工程においても従来方法に比べて
約半分の工程で済むことがわかる。
従来、機械構造部材に耐食性を与えるために簡
易法としてめつき処理を施してきた。強度を要す
る場合、熱処理めつき処理を施すため後処理、前
処工程が必要であつた。本発明によれば、熱処理
とめつき処理を一体化することができ、著しく処
理工程を短縮することが可能になつた。以上詳述
したように、本発明によつて得られるリンクチエ
ーンは、そお特性において従来のものより優れて
いる。[Table] (○Good, △Slightly good, ×Poor)
Figure 4 shows the manufacturing process of the product of the present invention and the conventional manufacturing process in which plating was applied to impart corrosion resistance, and it can be seen that the manufacturing process is only about half the time compared to the conventional method. . Conventionally, plating has been applied as a simple method to impart corrosion resistance to mechanical structural members. When strength is required, post-treatment and pre-treatment steps are required to perform heat treatment plating treatment. According to the present invention, heat treatment and plating treatment can be integrated, and it has become possible to significantly shorten the treatment process. As detailed above, the link chain obtained by the present invention is superior in characteristics to conventional ones.
第１図はめつき処理したリンクチエーンの引張
試験結果を示す特性図、第２図はリンクチエーン
の片振り疲れ試験結果を示す特性図、第３図は実
機リンクチエーンの摩耗試験結果を示す特性図、
第４図はリンクチエーンの製作工程図である。
Figure 1 is a characteristic diagram showing the results of a tensile test of a plated link chain, Figure 2 is a characteristic diagram showing the results of a oscillating fatigue test of a link chain, and Figure 3 is a characteristic diagram showing the results of a wear test of an actual link chain. ,
FIG. 4 is a diagram showing the manufacturing process of the link chain.
Claims (1)
浸炭窒化処理後、その雰囲気のまま重量でSn55
〜75％、Pb15〜30％、Zn1〜10％、Bi1〜15％か
らなる組成の250℃以下の溶融めつき浴中に直接
挿入し、焼入およびめつきを施すことを特徴とす
る耐食リンクチエーンの製造法。1 After carburizing or carbonitriding a link chain made of steel material, it becomes Sn55 by weight in that atmosphere.
-75% Pb, 15-30% Pb, 1-10% Zn, and 1-15% Bi. Corrosion-resistant link characterized by being inserted directly into a hot-melt plating bath at 250°C or less, and subjected to quenching and plating. Chain manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7930781A JPS57194247A (en) | 1981-05-27 | 1981-05-27 | Manufacture of corosion resistant link chain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7930781A JPS57194247A (en) | 1981-05-27 | 1981-05-27 | Manufacture of corosion resistant link chain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57194247A JPS57194247A (en) | 1982-11-29 |
| JPS6133073B2 true JPS6133073B2 (en) | 1986-07-31 |
Family
ID=13686187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7930781A Granted JPS57194247A (en) | 1981-05-27 | 1981-05-27 | Manufacture of corosion resistant link chain |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57194247A (en) |
-
1981
- 1981-05-27 JP JP7930781A patent/JPS57194247A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57194247A (en) | 1982-11-29 |
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