JPS62260043A - Steel for high strength chain of large diameter having superior toughness at low temperature - Google Patents
Steel for high strength chain of large diameter having superior toughness at low temperatureInfo
- Publication number
- JPS62260043A JPS62260043A JP10114086A JP10114086A JPS62260043A JP S62260043 A JPS62260043 A JP S62260043A JP 10114086 A JP10114086 A JP 10114086A JP 10114086 A JP10114086 A JP 10114086A JP S62260043 A JPS62260043 A JP S62260043A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- toughness
- chain
- strength
- high strength
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title abstract description 44
- 239000010959 steel Substances 0.000 title abstract description 44
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 abstract description 8
- 238000003466 welding Methods 0.000 abstract description 8
- 238000005496 tempering Methods 0.000 abstract description 7
- 239000010953 base metal Substances 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 2
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 230000007423 decrease Effects 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013003 hot bending Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は比濁や北極溝のような氷海域で使用される、海
底石油掘削リグ係留用チェーン用鋼に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a steel for mooring chains for offshore oil drilling rigs, which are used in icy areas such as turbidity and the Arctic Trench.
引張強度が７０ｋｇ／ＩＩＩ”以上で靭性に優れたチェ
ーンとして、本出願人の出願に係る特公昭６０−３３１
７８号や特公昭６１−７４６８号がある。As a chain with a tensile strength of 70 kg/III" or more and excellent toughness, Japanese Patent Publication No. 60-331 filed by the present applicant
There are No. 78 and Special Publication No. 61-7468.
しかしながら石油掘削活動が比濁や北極溝のような氷海
域へと進展するに伴い、リグ係留用のチェーンとして、
直径が７０ｍｍ以上の太径で低温靭性に優れたものが要
求されるようになってきた。例えば引張強度が７０ ｋ
ｇ ｆ ／■１２以上、降伏強度が４６ｋｇｆ／ｍｍ”
以上、伸び率が１７％以上、絞り率が５０％以上でさら
に母材部および溶接接合部のシャルピー吸収エネルギー
は一６０℃で２．８ ｋｇｆｒｍ以上が必要とされてい
る。現在、引張強度７゜ｋｇｆ／ｍｍ”以上の３種チェ
ーン用素材としては、ＪＩＳおよび日本海事協会規格（
ＮＫ）やノルウェー （ＮＶ）あるいはアメリカ船級協
会（ＡＢ）にそれぞれ、ＫＳＢＣ７０、ＮＶに３鋼およ
び３ａ鋼として成分が定められており、３種チェーンは
これらの成分から成る丸鋼を８００℃以上の高温に加熱
してリンク形状に加工後、一般に焼ならしゃ焼入焼戻等
の熱処理により製造されている。しかしこれらの３種チ
ェーンは、低温靭性が低く、せいぜい０℃までの海域で
使用されているもので、氷海域の環境温度である一６０
℃では到底使用出来るものではなかった。これに対して
一６０℃までの低温靭性を考慮したチェーン用鋼として
は、例えば特公昭５１−２４９６７号に良好な溶接性を
有する低炭素高強度構造用鋼の記載があり、この鋼の適
用温度は一６０℃まで考慮したものとなっている。しか
しこの鋼は焼入性向上元素として２〜５％もの多量のＣ
ｒを必要とする非常に高価な鋼材となっており、しかも
−６０’Ｃにおける溶接接合部の靭性については、全（
記載されておらず不明である。またこの発明に記載され
ている鋼材の直径は１０〜３０１鳳程度の細径材である
が、一般に径が太くなるに従って強度および靭性は著し
く低下することが知られている。However, as oil drilling activities progress into icy areas such as the Nemura and the Arctic Trench, rig mooring chains are becoming increasingly popular.
There is a growing demand for materials with a large diameter of 70 mm or more and excellent low-temperature toughness. For example, tensile strength is 70k
g f /■12 or more, yield strength 46 kgf/mm”
As mentioned above, the elongation rate is required to be 17% or more, the reduction rate is 50% or more, and the Charpy absorbed energy of the base metal and welded joint is required to be 2.8 kgfrm or more at -60°C. Currently, the three types of chain materials with a tensile strength of 7゜kgf/mm'' or higher are JIS and Nippon Kaiji Kyokai standards (
NK), Norway (NV), and American Bureau of Shipping (AB) respectively define the composition as KSBC70, NV 3 steel and 3a steel, and Class 3 chain is made of round steel made of these components and heated to 800℃ or higher. After being heated to a high temperature and processed into a link shape, it is generally manufactured by heat treatment such as normalizing, quenching, and tempering. However, these three types of chains have low low-temperature toughness and are used in sea areas with temperatures as low as 0°C.
It could not be used at all at ℃. On the other hand, as a steel for chains that takes into account low-temperature toughness up to -60°C, for example, Japanese Patent Publication No. 51-24967 describes a low-carbon high-strength structural steel with good weldability. Temperatures are taken into consideration down to -60°C. However, this steel contains a large amount of 2 to 5% C as an element that improves hardenability.
It is a very expensive steel material that requires a
It is not listed and is unknown. Further, the diameter of the steel material described in this invention is a small diameter material of about 10 to 301 mm, but it is generally known that as the diameter becomes thicker, the strength and toughness decrease significantly.
そこで本発明者らがこの発明と同じ成分を有する直径が
７８ｍｍの丸鋼を用い、フラッシュバット溶接実験を行
なったところ、多量のＣｒ酸化物が接合面に散在し、溶
接部の靭性は著しく低下するこ〔発明が解決しようとす
る問題点〕
本発明はこれまで製造出来なかった、氷海域で使用され
るチェーン用鋼に関するものであり、焼入焼戻処理によ
って直径７０龜−以一りの太径で引張強度が７０ｋｇｆ
／ａｍ２以上、降伏強度が４６ｋｇ ｆ ／ ｍｍ ”
以上、伸び率が１７％以上、絞り率が５０％以上で、さ
らに母材部および溶接接合部のシャルピー吸収エネルギ
ーが一６０℃で２．１３ ｋｇ ｒ ｍ以上が得られる
チェーン用鋼に関するものである。Therefore, when the present inventors conducted a flash butt welding experiment using round steel with a diameter of 78 mm and having the same components as those of this invention, a large amount of Cr oxide was scattered on the joint surface, and the toughness of the welded part was significantly reduced. [Problems to be Solved by the Invention] The present invention relates to a steel for chains used in icy areas, which has not been able to be manufactured up to now, and which can be made into a steel with a diameter of 70 mm or more by quenching and tempering. Large diameter with tensile strength of 70kgf
/am2 or more, yield strength is 46kg f/mm”
The above information relates to steel for chains that has an elongation rate of 17% or more, a reduction rate of 50% or more, and a Charpy absorbed energy of 2.13 kg r m or more at 160°C in the base metal and welded joints. be.
一般にチェーンリンクはフランシュバット溶接によって
接合されるが、溶接面には次に示すような種々の欠陥が
生成し、引張特性および靭性が劣化する。Generally, chain links are joined by Franchebutt welding, but various defects as shown below occur on the welded surface, deteriorating tensile properties and toughness.
まずフラッシングによって形成される溶融部に、これと
隣接する固相部からＣや合金元素が移動して濃化するが
、この溶融部がアプセット時に押し出されるため、接合
部にはこれらの元素が少なくなり焼入性が低下する。ま
た鋼材成分に相応して生成したＡＪ、 Ｓｔ、 Ｍｎお
よびＣｒ等の各種酸化物が完全に排出されず、一部溶接
面に残留するため引張特性および靭性が劣化する。また
アンプセント時の圧着力により接合面に平行なメタルフ
ローが生成し、これも長手方向の靭性劣化の原因となる
。First, carbon and alloying elements move from the adjacent solid phase to the molten zone formed by flashing and become concentrated, but since this molten zone is pushed out during upsetting, there are fewer of these elements in the joint. hardenability decreases. Furthermore, various oxides such as AJ, St, Mn, and Cr, which are generated depending on the steel composition, are not completely discharged and remain partially on the welded surface, resulting in deterioration of tensile properties and toughness. In addition, metal flow parallel to the bonding surface is generated due to the pressure bonding force at the time of amperage, which also causes deterioration of toughness in the longitudinal direction.
このように溶接部の機械的性質は種々の原因により、劣
化が避けられない。As described above, the mechanical properties of welded parts inevitably deteriorate due to various causes.
本発明は鋼材の成分を適切に組合わせることにより、従
来の溶接技術によっても強度および靭性に優れたチェー
ン用鋼を、低コストで提供することを目的とする。An object of the present invention is to provide, at low cost, a steel for chains that has excellent strength and toughness even when used with conventional welding techniques by appropriately combining the components of steel materials.
すなわち本発明は、
（ＩＩＣ：０．１５〜０．３５％、Ｓｉ：０．１５〜０
．５０％、 Ｍｎ： １．００〜２．００％、 Ｃｒ
； ０．５０％以下、 Ｍ。That is, the present invention provides (IIC: 0.15 to 0.35%, Si: 0.15 to 0
．． 50%, Mn: 1.00-2.00%, Cr
; 0.50% or less, M.
：０．１０〜０．６０％、酸可溶性１１ｊ２：０．０１
０〜０、１００％を含有し、残部はＦｅおよび不可避的
な不純物から成る、引張強度７０ｋｇｆ／ａｓ”以上。:0.10-0.60%, acid soluble 11j2:0.01
0 to 0, 100%, with the remainder consisting of Fe and unavoidable impurities, and has a tensile strength of 70 kgf/as'' or more.
−６０℃におけるシャルピー衝撃値２．８ ｋｇｆｍ以
上の低温靭性に優れた太径、高強度チェーン用鋼であり
、又、
！２１ Ｃ： ０．１５〜０．３５％、 Ｓｉ ：
０．１５〜０．５０％、 Ｍｎ： １．００〜２．００
％、 Ｃｒ ： ０．５０％以下、 Ｉ’ｌ。It is a steel for large-diameter, high-strength chains with excellent low-temperature toughness, with a Charpy impact value of 2.8 kgfm or more at -60°C, and! 21C: 0.15-0.35%, Si:
0.15-0.50%, Mn: 1.00-2.00
%, Cr: 0.50% or less, I'l.
： ０．１０〜０．６０％、酸可溶性Ａｊ！：０．０１
０〜０、１００％を含有し、更にＶ、Ｎｂおよび１゛ｉ
の１種または２種以上をそれぞれ０．０１〜０．１０％
を含有し、残部はＦｅおよび不可避的な不純物がら成る
、引張強度７０ ｋｇ ｆ ／ ａｍ”以上、−６０℃
におけるシャルピー衝撃値２．８ ｋｔｒｆｍ以上の低
温靭性に優れた太径、高強度チェーン用鋼である。: 0.10-0.60%, acid soluble Aj! :0.01
Contains 0 to 0, 100%, and further contains V, Nb and 1゛i
0.01 to 0.10% of one or more of the following.
with the remainder consisting of Fe and unavoidable impurities, tensile strength of 70 kg f/am" or more, -60°C
It is a large-diameter, high-strength chain steel with excellent low-temperature toughness and a Charpy impact value of 2.8 ktrfm or higher.
次に本発明の条件を定めた理由について述べる。 Next, the reason for determining the conditions of the present invention will be described.
（１１Ｃは低コストで鋼の焼入性を高める最良の元素で
あるが、含有量が０．１５％未満では、所定の強度が得
られず、一方０．３５％を超えると焼入時に割れが発生
したりフラッシュバット溶接接合部の靭性劣化を招くた
め上限を０．３５％とした。(11C is the best element to improve the hardenability of steel at low cost, but if the content is less than 0.15%, the required strength cannot be obtained, while if it exceeds 0.35%, it will crack during hardening.) The upper limit was set at 0.35% to prevent the occurrence of oxidation and deterioration of the toughness of flash butt welded joints.
（２１Ｓｔは強化元素として使用すると同時に、脱酸元
素として使用するもので０．１５％未満では、両効果が
期待出来ない。また強化および脱酸作用は０．５０％で
十分であり、０．５０％を超えるとシリケート系介在物
の増加により靭性および延性の低下を招くため上限を０
．５０％とした。(21St is used both as a reinforcing element and as a deoxidizing element, so if it is less than 0.15%, both effects cannot be expected. Furthermore, 0.50% is sufficient for strengthening and deoxidizing effects, and 0.50% is sufficient for strengthening and deoxidizing effects. If it exceeds 50%, the toughness and ductility will decrease due to an increase in silicate inclusions, so the upper limit should be set to 0.
．． It was set at 50%.
（３１Ｍｎは靭性劣化の少ない焼入性向上元素として使
用するものであるが、１％未満では十分な焼入効果が得
られず強度の確保が困難であり、また２、０％を超える
と焼割れが発生するようになるため上限を２．０％とし
た。(31Mn is used as an element to improve hardenability with less deterioration of toughness, but if it is less than 1%, sufficient hardening effect cannot be obtained and it is difficult to secure strength, and if it exceeds 2.0%, hardening is difficult. The upper limit was set at 2.0% because cracks would occur.
ｆＪ Ｃｒは溶鋼中のＣの活量を低下させフランシュ
バット溶接時の脱炭を少なくするのに有効な元素である
が、一方酸化物を形成しやすく、これが接合面に残留し
て靭性を低下させる主要な原因となるため上限は０．５
０％とした。またＣｒを使用しなくてもＣ，Ｍｎ等の組
み合わせにより、所要の溶接部材質が得られるため下限
は０％とした。fJ Cr is an effective element for reducing the activity of C in molten steel and reducing decarburization during Franchebutt welding, but on the other hand, it tends to form oxides, which remain on the joint surface and reduce toughness. The upper limit is 0.5 as this is the main cause of
It was set to 0%. In addition, the lower limit was set at 0% because the required quality of the welded part can be obtained by combining C, Mn, etc. without using Cr.
（５） Ｍｏはフラッシュバット溶接時に減少する割
合が極めて少ない元素の一つで、溶接部の焼入性を確保
するために使用する。さらにチェーンの焼戻処理時にお
いて軟化抵抗が大となるため、高温焼戻が可能となり靭
延性を向上させる。氷海域におけるチェーンの到達温度
は一６０℃であり、当該温度で所定の衝撃値を得るため
には０．１０％以上必要であり、また０、６０％を超え
ると前記効果が飽和し、コスト増を招°くためＭｏの必
要量は０．１０〜０．６０％とした。(5) Mo is one of the elements whose rate of decrease is extremely small during flash butt welding, and is used to ensure the hardenability of the welded part. Furthermore, since the softening resistance increases during tempering of the chain, high temperature tempering becomes possible and toughness and ductility are improved. The temperature reached by the chain in icy waters is -60℃, and in order to obtain the specified impact value at that temperature, 0.10% or more is required, and if it exceeds 0.60%, the above effect is saturated and the cost is reduced. The required amount of Mo was set to 0.10 to 0.60% in order to cause an increase in the amount of Mo.
（６）酸可溶性Ａ１はチェーンの焼入時においてオース
テナイト結晶粒の粗大化を防止し、熱処理後の組織を微
細化するため靭性を向上させる作用を有する。この効果
を得るためにはｏ、ｏｉｏ％以上の含有量が必要であり
また０、 １００％を超えるとアルミナ系の介在物が増
加し、靭性の劣化を招くため上限を０．１００％とした
。(6) Acid-soluble A1 prevents coarsening of austenite crystal grains during hardening of the chain and refines the structure after heat treatment, thereby improving toughness. In order to obtain this effect, a content of 0.0% or more is required, and if it exceeds 0.100%, alumina-based inclusions will increase, leading to deterioration of toughness, so the upper limit was set at 0.100%. .
（７１Ｎｂ、 ＶおよびＴｉは熱処理後の結晶粒の微
細化に寄与すると同時に、炭窒化物を析出するため母材
部および溶接部の強度および靭性の両特性を改善する。(71Nb, V, and Ti contribute to the refinement of grains after heat treatment, and at the same time improve both the strength and toughness properties of the base metal and weld zone because they precipitate carbonitrides.
このため、チェーンの強度および靭性を、さらに高めた
い場合に使用するもので、この強靭化作用は単独または
複合添加によって得られる。このためには、それぞれ０
．０１０％以上必要であり、また０、 １００％を超え
るとコスト高となり、さらに介在物が増加し靭性を低下
させるため上限を０．１００％とした。Therefore, it is used when it is desired to further increase the strength and toughness of the chain, and this toughening effect can be obtained by adding it alone or in combination. For this, each 0
．． The upper limit is set to 0.100% because it requires at least 0.10%, and if it exceeds 0.100%, the cost will increase and inclusions will increase and the toughness will decrease.
次に実施例により本発明を説明する。第１図にチェーン
の製造工程を示す。チェーン用素材としては一般に丸棒
が使用され、これを鋸によって所定の長さに切断し、熱
間にで曲げ加工後フラ、７シユバソＦ？容接により接合
される。その後焼ならしまたは焼入焼戻等の熱処理によ
って強度および靭性が付与される。第１表に転炉で出鋼
し試験に用いた本発明鋼および比較材としてのＪＩＳ
３種チェーン用ＫＳＢＣ７０鋼の化学成分と、あわせて
従来技術の一例として特公昭５１−２４９６７号で開示
されている鋼の化学組成（化学組成は実施例から引用し
た）を記載した。Next, the present invention will be explained with reference to Examples. Figure 1 shows the chain manufacturing process. A round bar is generally used as the material for the chain, which is cut into a predetermined length using a saw, and after hot bending, the bar is cut into a specified length. Joined by welding. Thereafter, strength and toughness are imparted by heat treatment such as normalizing or quenching and tempering. Table 1 shows the steel of the present invention tapped in a converter and used for testing, and the JIS steel as a comparison material.
The chemical composition of KSBC70 steel for type 3 chains and the chemical composition of steel disclosed in Japanese Patent Publication No. 51-24967 as an example of the prior art (the chemical composition is taken from the examples) are described.
本発明鋼は氷海域用チェーンへの適用を目的としたもの
であるが、これを３種チェーン用鋼と比較するとＣｒ＋
Ｍｏの両元素（本発明鋼１，３，４゜５）あるいはＭ
ｏが増加している（本発明鋼２）。The steel of the present invention is intended to be applied to chains for use in icy areas, but when compared with steel for type 3 chains, it has Cr+
Both elements of Mo (invention steel 1, 3, 4°5) or M
o has increased (invention steel 2).
しかし同じ氷海域用チェーンへの適用を目的とした特公
昭５１−２４９６７１１４に比較して本発明鋼は、Ｃｒ
を著しく低くし、若干のＭｏを使用している点に特徴が
ある。However, the steel of the present invention has Cr
It is characterized in that it has a significantly low value and uses a small amount of Mo.
次に本発明鋼１〜４および３種チェーン用鋼を用いて、
熱間圧延によって直径が７８−量の棒ｊ１２１に、また
本発明鋼５は１２０■諷サイズの丸棒に圧延した。これ
を】メートルずつの長さに切断して加熱炉中で９５０
’Ｃで４５分間加熱した後、直ちに円環状に曲げ加工を
行ない両端部をフラッシュバット溶接により接合し、チ
ェーンリンクを製造した。Next, using inventive steels 1 to 4 and type 3 chain steel,
The steel of the present invention was hot rolled into a bar J121 with a diameter of 78 mm, and the steel of the present invention was rolled into a round bar with a diameter of 120 mm. This was cut into lengths of 950 meters in a heating furnace.
After heating at C for 45 minutes, it was immediately bent into an annular shape and both ends were joined by flash butt welding to produce a chain link.
このリンクを連結して製造したチェーン１５０メートル
を第２表に示す温度条件で縦型の連続熱処理炉により
９５０℃に加熱後、焼入処理を行ない、５５０℃および
６５０℃で焼戻処理を行なった。これに対して特公昭５
１−２４９６７鋼は、発明の詳細な説明によると、熱処
理は焼入まま（水冷、油冷）および焼ならしく空冷）処
理が行なわれている。 −
次に熱処理後のチェーンリンクの（２／３）ｒ（ｒ：リ
ンク材の半径）の位置から、ＪＩＳ１４Ａ号引張試験片
およびＪＩＳ ｄ号衝撃試験片を採取しく第２図参照）
材質特性を調査した。第３表に調査結果を示す。A 150 meter chain manufactured by connecting these links was heated in a vertical continuous heat treatment furnace under the temperature conditions shown in Table 2.
After heating to 950°C, quenching treatment was performed, and tempering treatment was performed at 550°C and 650°C. In contrast,
According to the detailed description of the invention, 1-24967 steel is heat treated as-quenched (water-cooled, oil-cooled) and as-quenched (air-cooled). - Next, collect a JIS No. 14A tensile test piece and a JIS No. d impact test piece from the (2/3) r (r: radius of the link material) position of the chain link after heat treatment (see Figure 2).
The material properties were investigated. Table 3 shows the survey results.
本発明鋼ｌはＡ条件で熱処理を行なった場合には、伸び
率および溶接部の靭性が氷海域用チェーンの要求値を満
足出来ないが、Ｂ条件の熱処理により全ての特性を十分
満足出来る。これに対してＶ、Ｎｂ、またはＴｉを単独
あるいは複合添加した、本発明鋼２，３，４．５は細粒
化効果により、母材部および溶接部靭性は、さらに改善
されている。When the steel of the present invention is heat treated under condition A, the elongation rate and toughness of the welded part cannot satisfy the required values for a chain for use in icy areas, but when heat treated under condition B, all properties can be fully satisfied. On the other hand, steels 2, 3, and 4.5 of the present invention to which V, Nb, or Ti was added singly or in combination had further improved base metal and weld zone toughness due to the grain refining effect.
また現行の３種チェーン用ＫＳＢＧ７０綱ではＤ条件の
熱処理により、引張特性は要求値を満足するが、溶接接
合部の衝撃値が低く要求値を満足できない。特公昭５１
−２４９６７鋼は発明の詳細な説明によれば、加熱後水
冷または油冷によって３０■■ψサイズまでは強度およ
び絞り率は氷海域用チェーンの要求値を満足出来るが伸
び率は十分でなく、また−６０℃における母材部衝撃値
は、氷海域用チェーンの要求値を満足しているが、チェ
ーンに躾も重要な溶接接合部の衝撃特性の記載がないた
め不明であり、１；１述したようにサイズが太くなると
強度および靭性（特に溶接接合部の靭性）が低下するこ
とから当該鋼をそのまま氷海域用チェーンへ適用出来な
いものと予想される。Furthermore, with the current KSBG70 steel for type 3 chains, the tensile properties satisfy the required value due to heat treatment under D conditions, but the impact value of the welded joint is too low to meet the required value. Special Public Service 1977
According to the detailed description of the invention, -24967 steel can satisfy the required values for chains for use in icy waters in terms of strength and reduction rate up to a size of 30■■ψ by water or oil cooling after heating, but the elongation rate is not sufficient. In addition, the impact value of the base metal at -60°C satisfies the required value for chains for use in icy areas, but it is unknown because there is no description of the impact characteristics of welded joints, which are important for chain maintenance. As mentioned above, as the size increases, the strength and toughness (particularly the toughness of welded joints) decrease, so it is expected that the steel cannot be applied as is to chains for use in icy areas.
以上のように本発明は、これまで製造出来なかった直径
が７０■■以上の太径で高強度高靭性が要求される、氷
海域チェーン用鋼を低コストで提供するものであり、そ
の効果は極めて大きい。なお、本発明は、太径用として
開発されたが、種々の直径のチェーン用としても適用で
きる。As described above, the present invention provides low-cost steel for ice-water chains, which has a large diameter of 70mm or more and requires high strength and toughness, which has not been able to be manufactured up to now. is extremely large. Although the present invention was developed for chains with large diameters, it can also be applied to chains of various diameters.
第１図はチェーンの製造工程を示し、第２図は機械試験
片の採取位置を示す。Figure 1 shows the manufacturing process of the chain, and Figure 2 shows the locations where mechanical test pieces are taken.
Claims (2)
、残部はＦｅおよび不可避的な不純物から成る、引張強
度７０ｋｇｆ／ｍｍ＾２以上、−６０℃におけるシャル
ピー衝撃値２．８ｋｇｆｍ以上の低温靭性に優れた太径
、高強度チェーン用鋼。(1) C: 0.15 to 0.35 wt% Si: 0.15 to 0.50 wt% Mn: 1.00 to 2.00 wt% Cr: 0.50 wt% or less Mo: 0.10 to 0.60% by weight Acid-soluble Al: Contains 0.010 to 0.100% by weight, the remainder consists of Fe and inevitable impurities, tensile strength 70 kgf/mm^2 or more, Charpy impact value 2 at -60°C Steel for large-diameter, high-strength chains with excellent low-temperature toughness of 8 kgfm or more.
、更にＶ、ＮｂおよびＴｉの１種または２種以上をそれ
ぞれ０．０１〜０．１０％を含有し、残部はＦｅおよび
不可避的な不純物から成る、引張強度７０ｋｇｆ／ｍｍ
＾２以上、−６０℃におけるシャルピー衝撃値２．８ｋ
ｇｆｍ以上の低温靭性に優れた太径、高強度チェーン用
鋼。(2) C: 0.15 to 0.35 wt% Si: 0.15 to 0.50 wt% Mn: 1.00 to 2.00 wt% Cr: 0.50 wt% or less Mo: 0.10 to Contains 0.60% by weight of acid-soluble Al: 0.010 to 0.100% by weight, further contains 0.01 to 0.10% of one or more of V, Nb and Ti, and the remainder is composed of Fe and unavoidable impurities, has a tensile strength of 70 kgf/mm
^2 or more, Charpy impact value 2.8k at -60℃
Steel for large-diameter, high-strength chains with excellent low-temperature toughness exceeding gfm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10114086A JPS62260043A (en) | 1986-05-02 | 1986-05-02 | Steel for high strength chain of large diameter having superior toughness at low temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10114086A JPS62260043A (en) | 1986-05-02 | 1986-05-02 | Steel for high strength chain of large diameter having superior toughness at low temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62260043A true JPS62260043A (en) | 1987-11-12 |
| JPH0432143B2 JPH0432143B2 (en) | 1992-05-28 |
Family
ID=14292774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10114086A Granted JPS62260043A (en) | 1986-05-02 | 1986-05-02 | Steel for high strength chain of large diameter having superior toughness at low temperature |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62260043A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020055279A (en) * | 2000-12-28 | 2002-07-08 | 이계안 | Cold work embrittlement free high strength steel sheet |
| CN100420765C (en) * | 2006-03-07 | 2008-09-24 | 河北工业大学 | Steel for circular ring chains for mineral purpose |
| JP2015501384A (en) * | 2011-10-26 | 2015-01-15 | アールウーデー ケッテン リーガー ウント ディエッツ ゲーエムベーハー ウー． ツェーオー． カーゲー | Hardened steel for lifting, fastening, clamping and / or securing means and connecting elements, members for lifting, fastening, clamping and / or securing techniques, connecting elements and methods for their production |
| JP2019127636A (en) * | 2018-01-26 | 2019-08-01 | 日本製鉄株式会社 | Mooring chain steel and mooring chain |
| JP2021001366A (en) * | 2019-06-21 | 2021-01-07 | 日本製鉄株式会社 | Mooring chain and vessel |
| CN114369759A (en) * | 2021-12-20 | 2022-04-19 | 江苏亚星锚链股份有限公司 | Low temperature resistant anchor chain |
-
1986
- 1986-05-02 JP JP10114086A patent/JPS62260043A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020055279A (en) * | 2000-12-28 | 2002-07-08 | 이계안 | Cold work embrittlement free high strength steel sheet |
| CN100420765C (en) * | 2006-03-07 | 2008-09-24 | 河北工业大学 | Steel for circular ring chains for mineral purpose |
| JP2015501384A (en) * | 2011-10-26 | 2015-01-15 | アールウーデー ケッテン リーガー ウント ディエッツ ゲーエムベーハー ウー． ツェーオー． カーゲー | Hardened steel for lifting, fastening, clamping and / or securing means and connecting elements, members for lifting, fastening, clamping and / or securing techniques, connecting elements and methods for their production |
| JP2019127636A (en) * | 2018-01-26 | 2019-08-01 | 日本製鉄株式会社 | Mooring chain steel and mooring chain |
| JP2021001366A (en) * | 2019-06-21 | 2021-01-07 | 日本製鉄株式会社 | Mooring chain and vessel |
| CN114369759A (en) * | 2021-12-20 | 2022-04-19 | 江苏亚星锚链股份有限公司 | Low temperature resistant anchor chain |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0432143B2 (en) | 1992-05-28 |
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| EXPY | Cancellation because of completion of term |