JPS61149462A - Cored steel for of rock drill - Google Patents
Cored steel for of rock drillInfo
- Publication number
- JPS61149462A JPS61149462A JP28052084A JP28052084A JPS61149462A JP S61149462 A JPS61149462 A JP S61149462A JP 28052084 A JP28052084 A JP 28052084A JP 28052084 A JP28052084 A JP 28052084A JP S61149462 A JPS61149462 A JP S61149462A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- less
- rock drill
- tempering
- hollow steel
- 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.)
- Pending
Links
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、さく岩機ロッド用の中空鋼鋼材に関するもの
であり、更に詳しくは、耐熱強度をより一層向上させた
、中空鋼鋼材に係わるものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hollow steel material for a rock drill rod, and more specifically, to a hollow steel material with further improved heat resistance strength. It is something.
［従来技１１ｉｒ］
さく岩機用ロッドのうち継ロッドと称されるものは、両
端に螺子溝を設けた数個の中空鋼鋼材を、内面に螺子山
を設けたカップリングスリーブによりつぎ目をつなぎ合
せて使用される。従来ロッド用の中空鋼鋼材としては、
ＪＩＳ ５ＫＣ３１を浸炭、焼入、焼戻し後ショット
ピーニングを施し、製作したものが使用されている。と
ころが、この鋼材はさく宮中に、回転トルクがかかるた
め、前記両端のつぎ目の螺子螺合部分が発熱する。その
結果、表面硬さが低下して塑性変形を引起こし、この部
分からきれつを生じて破損する。又、製造過程で、浸炭
焼入れ、焼戻し処理したものは、処理時に、粒界酸化を
生ずるので高温発熱によりその部分にきれつを生じて破
損する。即ち、従来の中空鋼鋼材は、これをさく岩機の
ロッド用とじた場合、継目における螺子部の耐熱性が弱
くこれが耐用期間を短命化する原因となっていた。[Conventional technique 11ir] Of the rods for rock drilling machines, those called joint rods are made by connecting several hollow steel members with threaded grooves on both ends with a coupling sleeve with threaded threads on the inner surface. used in conjunction. Conventional hollow steel materials for rods include:
The material used is one made by carburizing, quenching, and tempering JIS 5KC31, followed by shot peening. However, since rotational torque is applied to this steel material during drilling, the threaded portions of the seams at both ends generate heat. As a result, the surface hardness decreases, causing plastic deformation, and cracking occurs from this portion, resulting in damage. Furthermore, in the manufacturing process, products that have been carburized, quenched, and tempered undergo grain boundary oxidation during processing, which causes cracks to occur in those areas due to high-temperature heat generation, resulting in breakage. That is, when conventional hollow steel materials are used for rods of rock drilling machines, the threaded portions at the joints have poor heat resistance, which shortens the service life.
［発明が解決しようとする問題点］
以上のような事情に鑑み、本発明は、高温発熱条件下で
も充分にロッド用の中空鋼鋼材として充分に使用しうる
高強度の中空鋼鋼材を提供することを目的とするもので
ある。[Problems to be Solved by the Invention] In view of the above circumstances, the present invention provides a high-strength hollow steel material that can be used satisfactorily as a hollow steel material for rods even under high-temperature exothermic conditions. The purpose is to
Ｌ問題を解決するための手段］
本発明者等は、種々検討の結果、Ｊ ＴＳＳＫＣ３１に
規定されている合金成分の含有量を変更することによっ
て、上記問題を解決しうろことを見出した。即ち、本発
明は、Ｃ：０．２〜Ｏ２４％（重量％を示す、以下同様
＞、ｓｉ：０．３５％以下、Ｍｎ：２．０％以下、Ｎｉ
：３．０％以下、Ｃｒ：２．０％以下、Ｍｏ ：０
．７５％〜５．０％を含有し、残部がＦｅ及び不純物よ
り構成され、高周波又は浸炭焼入れ焼戻しを施してなる
ことを特徴とするさく岩機ロッド用の中空鋼鋼材を要旨
とするものである。上記合金の各成分の作用と組成範囲
の限定理由を述べれば次のとおりである。Means for Solving the L Problem] As a result of various studies, the present inventors have found that the above problem can be solved by changing the content of alloy components specified in JTSSKC31. That is, the present invention provides carbon: 0.2 to 24% (indicates weight %, the same applies hereinafter), Si: 0.35% or less, Mn: 2.0% or less, Ni
: 3.0% or less, Cr: 2.0% or less, Mo: 0
．． The object is a hollow steel material for a rock drilling rod, which is characterized by containing 75% to 5.0%, the balance being composed of Fe and impurities, and having been subjected to induction treatment or carburizing and quenching and tempering. . The effects of each component of the above alloy and the reason for limiting the composition range are as follows.
Ｃ；素池部に強靭性を与える元素であり、靭性は０１２
５以上あれば高いが、０．４％を超えると却って低くな
る。C: Element that gives toughness to the base part, toughness is 012
If it is 5 or more, it is high, but if it exceeds 0.4%, it is rather low.
Ｓｊ ：脱酸剤として０．３５％以下含有させる。Sj: Contain 0.35% or less as a deoxidizing agent.
尚、０．１５％以下に含有量を下げると浸炭処理時の粒
界酸化を防止できる。Incidentally, if the content is lowered to 0.15% or less, grain boundary oxidation during carburization can be prevented.
Ｎ１ ：よく知られている様に、高靭性を与える元素で
ある。本発明の鋼合金においては、３％以上含有させて
も効果は飽和する。N1: As is well known, it is an element that provides high toughness. In the steel alloy of the present invention, the effect is saturated even if the content is 3% or more.
Ｃｒ：焼入れ性を高めると同時に、球状炭化物を形成し
、耐摩耗性に寄与する。本発明の合金の場合、２％以上
含有させると、炭化物が網状化して耐摩耗性が劣化する
。Cr: Improves hardenability, forms spherical carbides, and contributes to wear resistance. In the case of the alloy of the present invention, if the content is 2% or more, the carbides become reticulated and the wear resistance deteriorates.
ＭＯ：高温強度を向上させるために、０．７５％以上含
有させる。しかし、５％を超えると、この効果が飽和す
るａ Ｓ ｉの存在による与炭性の低下を防止し網状の
炭化物の形成を防ぐにも有効である。MO: Contains 0.75% or more to improve high temperature strength. However, if it exceeds 5%, this effect is saturated, which is effective in preventing the deterioration of carburizing properties due to the presence of a Si and also in preventing the formation of network-like carbides.
Ｍｎ：焼入れ性を向上させるので、２３０％以下含有さ
せる。但し２．０％をこえると、靭性が低下する。Mn: Since it improves hardenability, Mn is contained in an amount of 230% or less. However, if it exceeds 2.0%, the toughness decreases.
Ａｉ、Ｔｉ、Ｎｂ、Ｚｒ、■＝結晶粒（７） １ 天上
による靭性の低下を防止する。しかし０．５％をこえて
含有させてもこの効果は飽和する。Ai, Ti, Nb, Zr, ■=Crystal grain (7) 1 Prevents deterioration of toughness due to topography. However, this effect is saturated even if the content exceeds 0.5%.
本発明における合金組成の特徴を要約すると、ＭＯ含有
量を増量することで高温発熱時における芯部および表面
層硬さを確保し、同時に特殊な球状炭化物を形成させて
耐摩耗性を高めたものである。また浸炭処理をおこなう
ものは、粒界酸化の発生を防止するために低Ｓｉ含有量
に限定する。To summarize the characteristics of the alloy composition in the present invention, by increasing the MO content, the core and surface layer hardness is ensured during high-temperature heat generation, and at the same time, special spherical carbides are formed to improve wear resistance. It is. Furthermore, the carburizing treatment is limited to a low Si content in order to prevent the occurrence of grain boundary oxidation.
さらに浸炭効果を高める目的で長時間の処理を行なうと
結晶粒の粗大化が起って靭性が低下する恐れがあるが、
上記合金成分に加え、Ｔｉ 、 Ｎｂ ｚＺｒ 、Ａ立
、■のいずれか１種又は２１以上を添加することにより
、かなり防止される。それ故、本発明のもう一つの好ま
しい態様は、前記合金成分に加えて、Ｔｉ：０５％以下
、Ｎｂ：０．５％以下、へ立＝０．５％以下、Ｚｒ ：
０．５％以下、及びＶ：０．５％以下を含有する材料で
構成してなるものである。Furthermore, if the treatment is carried out for a long time to increase the carburizing effect, there is a risk that the grains will become coarser and the toughness will decrease.
This can be significantly prevented by adding one or more of Ti, NbzZr, Al, and 21 or more to the above alloy components. Therefore, another preferred embodiment of the present invention is that, in addition to the above alloy components, Ti: 05% or less, Nb: 0.5% or less, helical content: 0.5% or less, Zr:
It is made of a material containing V: 0.5% or less and V: 0.5% or less.
本発明のさく岩機ロッド用中空鋼鋼材の＠１造のための
上記組成の溶製、鍛造、加工、浸炭、又は高周波加熱に
よる焼入れ、焼戻しの諸工程は、従来のこの種の鋼の製
作に当って行なわれている方法に従って実施すればよい
。The various steps of melting, forging, processing, carburizing, or quenching and tempering by high-frequency heating of the above composition for @1 manufacturing of the hollow steel material for rock drilling rod of the present invention are the same as the conventional manufacturing of this type of steel. It can be carried out according to the method used in the
［効果Ｊ
本発明のさく岩機ロッド用の中空鋼鋼材は以上のべたよ
うに、従来のＪＩＳＳＫＣ３１の合金組成割合を変更し
た新規合金組成よりなり、高温発熱条件下においても高
い耐熱強度を維持できるので、長期の耐用年数の要求さ
れるさく岩機ロンド用の材料として好適なものである。[Effect J] As described above, the hollow steel material for rock drilling rods of the present invention has a new alloy composition in which the alloy composition ratio of the conventional JISSKC31 has been changed, and can maintain high heat-resistant strength even under high-temperature exothermic conditions. Therefore, it is suitable as a material for rock drill rondos, which require a long service life.
［実施例〕
第１表に示す組成（残部は実質的にＦｅ）の鋼を溶製し
た。[Example] Steel having the composition shown in Table 1 (the remainder being substantially Fe) was melted.
それらの素材から、試験片を採取し、以下の熱処理を施
して各種性能比較試験を行なった。この結果は第２表に
示すとおりである。Test pieces were taken from these materials, subjected to the following heat treatments, and various performance comparison tests were conducted. The results are shown in Table 2.
熱処理条件
（１） 浸炭、焼入、焼戻
ガス浸炭 ９２０℃Ｘ１３Ｈｒ Ａ、Ｃ焼入 ８３
０℃ｘｏ、５Ｈｒ Ａ、Ｃ焼戻 ２５０℃ｘ３Ｈｒ
Ａ、Ｃ
（２） 焼入焼戻
焼入 ８３０℃×０．５ＨｒＡ、Ｃ焼戻 ５１
０℃Ｘ３ｌ−１ｒ Ａ、 Ｃ上記の試験より次のことが
判った。Heat treatment conditions (1) Carburizing, quenching, tempering Gas carburizing 920℃X13Hr A, C quenching 83
0℃xo, 5Hr A, C tempering 250℃x3Hr
A, C (2) Quenching, tempering, quenching 830℃×0.5HrA, C tempering 51
0℃X3l-1r A, C The following was found from the above test.
（１）Ｍｏを多量に含有する本発明鋼は、いづれも高温
引張強度が高く、優れた耐熱強度を有する。(1) All of the steels of the present invention containing a large amount of Mo have high high temperature tensile strength and excellent heat resistance strength.
（２）低３ｉ含有鋼は、浸炭後の粒界酸化が少ない。(2) Low 3i content steel has less grain boundary oxidation after carburizing.
（３）Ｖ、Ｔｉ 、Ｎｂ等の添加により衝撃値の向上が
認められる。(3) The impact value is improved by adding V, Ti, Nb, etc.
（４）以上によりロッドの使用寿命並びに性能の向上が
、顕著に認められる。(4) As a result of the above, the service life and performance of the rod are significantly improved.
Claims (1)
ｎ：２．０％以下、Ｎｉ：３．０％以下、Ｃｒ：２．０
％以下、Ｍｏ：０．７５〜５．０％を含有し残部がＦｅ
及び不純物より構成され、高周波又は浸炭焼入れ焼戻し
を施してなることを特徴とするさく岩機ロッド用の中空
鋼鋼材。 ２ Ｓｉを０．１５％以下含有し、その他は前記合金成
分より構成され、浸炭焼入れ焼戻しを施してなる特許請
求の範囲第１項記載のさく岩機ロッド用の中空鋼鋼材。 ３ Ａｌ、Ｔｉ、Ｎｂ、Ｚｒ及びＶを各々０．５％以下
含有し、その他は前記第１項又は第２項記載の合金成分
より構成され、高周波又は浸炭焼入れ焼戻しを施してな
るさく岩機ロッド用の中空鋼鋼材。[Claims] 1 C: 0.2 to 0.4%, Si: 0.35% or less, M
n: 2.0% or less, Ni: 3.0% or less, Cr: 2.0
% or less, Mo: 0.75 to 5.0%, the balance being Fe
A hollow steel material for a rock drill rod, characterized in that the hollow steel material is composed of and impurities and is subjected to induction treatment or carburization quenching and tempering. 2. A hollow steel material for a rock drill rod according to claim 1, which contains 0.15% or less of Si, and is otherwise composed of the above-mentioned alloy components, and is carburized, quenched and tempered. 3 A rock drill containing 0.5% or less of each of Al, Ti, Nb, Zr, and V, and other than the alloy components described in the above item 1 or 2, which is subjected to induction treatment or carburizing and quenching and tempering. Hollow steel material for rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28052084A JPS61149462A (en) | 1984-12-24 | 1984-12-24 | Cored steel for of rock drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28052084A JPS61149462A (en) | 1984-12-24 | 1984-12-24 | Cored steel for of rock drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61149462A true JPS61149462A (en) | 1986-07-08 |
Family
ID=17626246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28052084A Pending JPS61149462A (en) | 1984-12-24 | 1984-12-24 | Cored steel for of rock drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61149462A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102367556A (en) * | 2011-10-31 | 2012-03-07 | 铜陵狮达矿山机械有限公司 | Drilling steel and preparation method thereof |
| CN103695797A (en) * | 2013-12-21 | 2014-04-02 | 湘潭高新区风动机械有限公司 | Hollow steel for rock drilling tool |
| CN112322981A (en) * | 2020-11-06 | 2021-02-05 | 首钢贵阳特殊钢有限责任公司 | H22 and H25 drill rod hollow steel for rock drilling |
| CN113308645A (en) * | 2021-05-25 | 2021-08-27 | 浙江普兰卡钎具股份有限公司 | Steel for drill bit shell and preparation method thereof |
| CN113330126A (en) * | 2019-01-25 | 2021-08-31 | 古河凿岩机械有限公司 | Drilling tool and method for manufacturing same |
-
1984
- 1984-12-24 JP JP28052084A patent/JPS61149462A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102367556A (en) * | 2011-10-31 | 2012-03-07 | 铜陵狮达矿山机械有限公司 | Drilling steel and preparation method thereof |
| CN103695797A (en) * | 2013-12-21 | 2014-04-02 | 湘潭高新区风动机械有限公司 | Hollow steel for rock drilling tool |
| CN113330126A (en) * | 2019-01-25 | 2021-08-31 | 古河凿岩机械有限公司 | Drilling tool and method for manufacturing same |
| EP3916114A4 (en) * | 2019-01-25 | 2022-03-23 | Furukawa Rock Drill Co., Ltd. | Drill tool and method for producing same |
| CN112322981A (en) * | 2020-11-06 | 2021-02-05 | 首钢贵阳特殊钢有限责任公司 | H22 and H25 drill rod hollow steel for rock drilling |
| CN112322981B (en) * | 2020-11-06 | 2022-03-15 | 首钢贵阳特殊钢有限责任公司 | H22 and H25 drill rod hollow steel for rock drilling |
| CN113308645A (en) * | 2021-05-25 | 2021-08-27 | 浙江普兰卡钎具股份有限公司 | Steel for drill bit shell and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4266340B2 (en) | High strength wire for induction hardening with excellent cold workability and impact resistance, and steel parts using this wire | |
| JP2008280610A (en) | Carburized and high-frequency hardened part having high strength | |
| JP4632931B2 (en) | Induction hardening steel excellent in cold workability and its manufacturing method | |
| JP6794012B2 (en) | Mechanical structural steel with excellent grain coarsening resistance, bending fatigue resistance, and impact resistance | |
| US4202710A (en) | Carburization of ferrous alloys | |
| JPH0432537A (en) | Member for high strength machine structural use excellent in bearing strength | |
| JPH06172867A (en) | Production of gear excellent in impact fatigue life | |
| JPS61149462A (en) | Cored steel for of rock drill | |
| JPH07188895A (en) | Manufacture of parts for machine structure use | |
| JP2004315944A (en) | Cold-formed spring of high fatigue strength and high corrosion and fatigue strength, and steel for the spring | |
| JP6773120B2 (en) | Shaft parts | |
| JPH04124217A (en) | Production of high strength gear steel excellent in softening property | |
| JPS5916948A (en) | Soft-nitriding steel | |
| JPS6145686B2 (en) | ||
| JPS61295319A (en) | Manufacture of sucker rod for oil well containing wet gaseous carbon dioxide | |
| JPS637351A (en) | Body material for metal band saw | |
| JP3687275B2 (en) | Non-tempered steel for induction hardening | |
| JPH10204534A (en) | Track bushing and its production | |
| JPH07828B2 (en) | Carburized parts | |
| JP2001049337A (en) | Production of high strength spring excellent in fatigue strength | |
| JPH07116518B2 (en) | Manufacturing method of working roll for high load cold rolling mill with deep hardening depth | |
| JPH09324848A (en) | Carbon sintered gear component | |
| JPH04160135A (en) | Steel for carburization | |
| JP3658099B2 (en) | Method for producing wear-resistant tough roll | |
| JP3104449B2 (en) | Heat treatment of carburized gears |