JPH06277876A - Valve stem for diesel engine and its manufacture - Google Patents

Valve stem for diesel engine and its manufacture

Info

Publication number
JPH06277876A
JPH06277876A JP9205993A JP9205993A JPH06277876A JP H06277876 A JPH06277876 A JP H06277876A JP 9205993 A JP9205993 A JP 9205993A JP 9205993 A JP9205993 A JP 9205993A JP H06277876 A JPH06277876 A JP H06277876A
Authority
JP
Japan
Prior art keywords
less
diesel engine
valve rod
welding
valve
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
Application number
JP9205993A
Other languages
Japanese (ja)
Inventor
Yoshizo Hashimoto
橋本芳造
Takatoshi Tomoyasu
友保孝敏
Tadao Tanaka
田中忠夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
N Z K KK
Kobe Steel Ltd
Original Assignee
N Z K KK
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by N Z K KK, Kobe Steel Ltd filed Critical N Z K KK
Priority to JP9205993A priority Critical patent/JPH06277876A/en
Publication of JPH06277876A publication Critical patent/JPH06277876A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00Engines characterised by air compression and subsequent fuel addition
    • F02B3/06Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Arc Welding In General (AREA)

Abstract

PURPOSE:To provide a material and a working method by which a fire-contact surface excellent in weldability such as resistance to corrosion and crack, etc., can be attained in a build up welding of the manufacture of a valve stem made of a heat resisting steel, for a diesel engine for a marine or a power generation. CONSTITUTION:The composition of the build up welding metal of a fire-contact surface 3 contains 0.01 to 0.50% C, 0.1 to 2.0% Si, 35 to 55% Cr, 0.5 to 2.5% Al+Ti, and 0.01 to 0.6% N, further contains one kind or two kinds or over of <=2% Mn, <=3% V, 0.2 to 0.8% Nb, <=5% Mo, <=5% W, and <=5% Fe, and the balance Ni with inevitable impurities.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は舶用、発電用等の大型デ
ィーゼル機関用弁棒(以下、「弁棒」と称する)とその製
造方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve stem (hereinafter referred to as "valve stem") for a large diesel engine such as a ship and a power generator, and a method for manufacturing the same.

【0002】[0002]

【従来の技術】弁棒は、通常、図1に示すように、傘部
2に触火面3とフェース面4を有している。このような
弁棒1の寿命を決定する要因は大きく分けて2つある。
1つはシート面の摩耗、腐食、もう1つは触火面の腐食
である。
2. Description of the Related Art A valve rod generally has a head portion 2 and a fire surface 3 and a face surface 4 as shown in FIG. There are roughly two factors that determine the life of the valve rod 1.
One is wear and corrosion of the seat surface, and the other is corrosion of the fire contact surface.

【0003】これらの耐性を高めるため、肉盛技術が多
用されている。従来より、シート面の肉盛については多
くの開発が行われており、ステライト合金やNi自溶性
合金(コルモノイ合金)等が目的に応じて使用されてい
る。
[0003] In order to improve these resistances, overlaying techniques are often used. BACKGROUND ART Conventionally, many developments have been made on the buildup of a sheet surface, and a stellite alloy, a Ni self-fluxing alloy (Kormonoy alloy), or the like is used according to the purpose.

【0004】一方、触火面の肉盛は、シート面ほど一般
的には行われていないが、ハードな環境下で用いる弁棒
では肉盛による耐久性の向上が図られている。しかし、
シート面ほど研究もされておらず、肉盛材としても一般
的な高温耐食材であるインコネル等が用いられているに
すぎない。シート面に用いるステライトやコルモノイ合
金では、触火面のような広い面積の肉盛に対しては耐割
れ性が不十分で実用的ではない。
On the other hand, the overlaying of the touch surface is not generally performed as much as the seating surface, but the valve rod used in a hard environment is improved in durability by overlaying. But,
It has not been studied as much as the sheet surface, and only Inconel, which is a general high temperature resistant food material, is used as a cladding material. Stellite and Colmonoy alloys used for the sheet surface are not practical because they have insufficient crack resistance to build up a large area such as a fire surface.

【0005】近年、ディーゼル機関のランニングコスト
低減のため、不純物の多い燃料が用いられることが多
く、触火面の腐食が助長され、弁棒の寿命が低下してき
ている。その対策の1つとして、前述のインコネル合金
等を肉盛する弁棒等が供給されてきているが、十分な耐
食性とはいえない。
In recent years, in order to reduce the running cost of a diesel engine, a fuel containing a large amount of impurities is often used, which promotes corrosion of the touch surface and shortens the life of the valve stem. As one of the countermeasures, valve rods and the like, which are overlayed with the above-mentioned Inconel alloy, have been supplied, but they cannot be said to have sufficient corrosion resistance.

【0006】一方、弁棒の素材面からの開発も行われて
おり、その中でナイモニック80A(N80A)が不純物
の多い重質油の腐食にもかなり耐える材料として注目さ
れ、特に大型弁棒でかなり実績を挙げてきている。
On the other hand, the development of the material of the valve stem is also being carried out. Among them, Nimonic 80A (N80A) has attracted attention as a material that can withstand the corrosion of heavy oil containing a lot of impurities. Has been quite successful.

【0007】しかし、N80AはNi基の超合金であ
り、大型弁棒を全てこの素材で作ると極めて高価なもの
となり、普及一般化がしにくい状況にある。また、N8
0Aは溶接性の悪い母材であり、補修による繰り返し使
用にも限界がある。
However, N80A is a Ni-based superalloy, and if all large valve rods are made of this material, it becomes extremely expensive and it is difficult to popularize and popularize it. Also, N8
0A is a base material with poor weldability, and there is a limit to repeated use for repair.

【0008】こうした状況下において、安価な母材(オ
ーステナイト又はマルテンサイトステンレス鋼)に肉盛
して触火面の十分な耐食性を示す弁棒が必要となってき
ている。
Under these circumstances, there is a need for a valve rod which is built up on an inexpensive base material (austenite or martensitic stainless steel) and has sufficient corrosion resistance on the fired surface.

【0009】[0009]

【発明が解決しようとする課題】従来、こうした高温下
における耐食肉盛材としては、特開平1−273693
号にて新しいNi合金が提案されている。この材料は主
にシート面用として開発されたものであるが、高温腐食
に極めて優れた性能を有しており、触火面の肉盛材とし
て有望なものである。しかし、シート面に比べて遥かに
広い面積の肉盛が必要となる触火面への適用は、耐割れ
性が大きな問題となる。
Conventionally, as such a corrosion-resistant build-up material under high temperature, Japanese Patent Laid-Open No. 1-273693.
Issue, a new Ni alloy is proposed. Although this material was mainly developed for sheet surfaces, it has excellent properties against high temperature corrosion and is promising as a cladding material for fire surfaces. However, crack resistance is a major problem when applied to a touch surface that requires a much larger surface buildup than the sheet surface.

【0010】本発明は、上記従来技術の問題点を解決
し、優れた耐食性を有すると共に耐割れ性等の溶接作業
性も優れた触火面を有するディーゼル機関用弁棒並びに
肉盛施工法を提供することを目的とするものである。
The present invention solves the above-mentioned problems of the prior art and provides a valve stem for a diesel engine having a fired surface having excellent corrosion resistance and also excellent welding workability such as crack resistance, and a overlaying method. It is intended to be provided.

【0011】[0011]

【課題を解決するための手段】本発明者らは、前記課題
を解決するために、材料の成分面での見直しと施工法の
開発に努めた結果、触火面への高耐食性合金の肉盛を可
能としたものである。すなわち、材料の成分としてAl
+Ti量の最適化、或いは更にNb量の最適化を行うと共
に、施工法としてはPTA(粉体プラズマアーク)法を採
用し、積層、予熱条件等の開発により、割れのない施工
を確立し、ここに本発明をなしたものである。
In order to solve the above-mentioned problems, the inventors of the present invention have made efforts to review the composition of the material and develop a construction method, and as a result, the meat of the highly corrosion-resistant alloy on the touch surface has been developed. It is possible to have a prime. That is, Al
+ Ti amount is optimized or Nb amount is further optimized, PTA (powder plasma arc) method is adopted as the construction method, and the development without cracks is established by the development of lamination and preheating conditions. The present invention has been made here.

【0012】すなわち、本発明は、耐熱鋼よりなる舶用
又は発電用ディーゼル機関用弁棒であって、その触火面
に肉盛金属を有し、該肉盛金属の組成が、C:0.01
〜0.50%、Si:0.1〜2.0%、Cr:35〜55
%、Al+Ti:0.5〜2.5%、N:0.01〜0.6%
を含有し、更にMn:2%以下、V:3%以下、Nb:
0.2〜0.8%、Mo:5%以下、W:5%以下、Fe:
5%以下の1種又は2種以上を含有し、残部が実質的に
Ni又はNi+Coと不可避的不純物からなる組成である
ことを特徴とするディーゼル機関用弁棒を要旨としてい
る。
That is, the present invention is a valve rod for a marine vessel or a diesel engine for power generation, which is made of heat-resistant steel and has a build-up metal on its ignition surface, and the composition of the build-up metal is C: 0. 01
~ 0.50%, Si: 0.1-2.0%, Cr: 35-55
%, Al + Ti: 0.5 to 2.5%, N: 0.01 to 0.6%
In addition, Mn: 2% or less, V: 3% or less, Nb:
0.2-0.8%, Mo: 5% or less, W: 5% or less, Fe:
The gist of a valve rod for a diesel engine is characterized by containing 5% or less of one kind or two kinds or more, and the balance being a composition substantially composed of Ni or Ni + Co and inevitable impurities.

【0013】また、その製造方法は、耐熱鋼よりなる舶
用又は発電用ディーゼル機関用弁棒の触火面にPTA溶
接により肉盛金属を形成するに際し、溶接材料とし
て、C:0.01〜0.50%、Si:0.1〜2.0%、
Cr:35〜55%、Al+Ti:0.5〜2.5%、N:
0.01〜0.6%を含有し、更にMn:2%以下、V:
3%以下、Nb:0.2〜0.8%、Mo:5%以下、W:
5%以下、Fe:5%以下の1種又は2種以上を含有
し、残部が実質的にNi又はNi+Coと不可避的不純物
からなる組成の溶接材料を用い、予熱温度を、傘径1
50mmφ以下の弁棒の場合は200℃以上、傘径150
mmを超える弁棒の場合は200+(D−150)×0.5
℃以上(ここで、D:弁棒の傘径(mm))とし、触火面
中心部から外へ渦巻状にビードを形状する施工法で行う
ことを特徴としている。
Further, the manufacturing method is as follows. When forming a build-up metal by PTA welding on the ignition surface of a valve rod for a marine vessel or a diesel engine for power generation made of heat-resistant steel, as a welding material, C: 0.01 to 0 is used. .50%, Si: 0.1-2.0%,
Cr: 35-55%, Al + Ti: 0.5-2.5%, N:
0.01 to 0.6%, Mn: 2% or less, V:
3% or less, Nb: 0.2 to 0.8%, Mo: 5% or less, W:
5% or less, Fe: 5% or less, 1 type or 2 types or more, and the balance is substantially Ni or Ni + Co and a welding material having a composition essentially composed of unavoidable impurities.
For valve rods of 50 mmφ or less, 200 ° C or more, umbrella diameter 150
200+ (D-150) × 0.5 for valve rods exceeding mm
It is characterized in that it is carried out by a construction method in which the bead is formed in a spiral shape from the center of the ignition surface to the outside at a temperature of ℃ or higher (where D is the diameter of the valve stem (mm)).

【0014】[0014]

【作用】[Action]

【0015】以下に本発明を更に詳細に説明する。The present invention will be described in more detail below.

【0016】弁棒の母材の材質としては、耐熱鋼を用い
る。マルテンサイト系の耐熱鋼も小型バルブでは用いら
れるが、大型バルブでは靭性が要求されるため、高靭性
の鍛造オーステナイト耐熱鋼が最も適している。
Heat resistant steel is used as the material of the base material of the valve rod. Martensitic heat-resistant steel is also used in small valves, but large valves require toughness, so forged austenitic heat-resistant steel with high toughness is most suitable.

【0017】まず、触火面の肉盛材料の成分限定理由に
ついて説明する。
First, the reasons for limiting the components of the overlay material on the touch surface will be described.

【0018】C:Cは固溶体を強化して肉盛金属の硬さ
を得る成分で、0.01%未満では十分な硬さが得られ
ない。一方、0.50%を超えると溶接時の割れを発生
する。したがって、C量は0.01〜0.50%の範囲と
する。
C: C is a component for strengthening the solid solution to obtain the hardness of the overlay metal, and if it is less than 0.01%, sufficient hardness cannot be obtained. On the other hand, if it exceeds 0.50%, cracking occurs during welding. Therefore, the amount of C is set in the range of 0.01 to 0.50%.

【0019】Si:Siは作業性を安定化させる成分であ
り、0.1%未満では母材とのなじみが悪く、一方、2.
0%を超えると溶融金属が流れすぎて融合不良を発生す
る。したがって、Si量は0.1〜2.0%の範囲とす
る。
Si: Si is a component that stabilizes the workability, and if it is less than 0.1%, it is poorly compatible with the base metal, while 2.
If it exceeds 0%, molten metal will flow too much, resulting in poor fusion. Therefore, the amount of Si is set in the range of 0.1 to 2.0%.

【0020】Cr:Crは耐食、耐熱性を得るために必要
な成分であり、35%以上でその効果が認められるが、
35%未満では耐熱性が不十分で、耐酸化、耐食性が劣
化する。また、55%を超えると溶接時に割れが発生し
易くなる。したがって、Cr量は35〜55%の範囲と
する。
Cr: Cr is a component necessary for obtaining corrosion resistance and heat resistance, and its effect is recognized at 35% or more.
If it is less than 35%, the heat resistance is insufficient, and the oxidation resistance and corrosion resistance deteriorate. If it exceeds 55%, cracking tends to occur during welding. Therefore, the Cr amount is set in the range of 35 to 55%.

【0021】Al、Ti:Al、TiはNiと金属間化合物
を形成して硬さを得る成分であり、AlとTiは等量の効
果がある。しかし、Al+Ti合計量で0.5%未満では
その効果が得られない。Al又はTiを増やすと硬さは上
昇するが脆化するため、耐割れ性面から上限がある。す
なわち、弁棒のシート面の溶接では4.0%程度まで添
加しても溶接可能であるが、触火面の肉盛では面積が広
く、2.5%以下に抑えないと割れのない施工が困難と
なることが判明した。したがって、Al+Ti合計量を
0.5〜2.5%の範囲とする。なお、Al又はTiの一方
のみを添加し得ることはいうまでもない。
Al, Ti: Al, Ti are components for forming hardness by forming an intermetallic compound with Ni, and Al and Ti have the same effect. However, if the total amount of Al + Ti is less than 0.5%, the effect cannot be obtained. When Al or Ti is increased, the hardness increases but it becomes brittle, so there is an upper limit in terms of crack resistance. In other words, in the welding of the seat surface of the valve rod, it is possible to weld it even if it is added up to about 4.0%, but in the overlay of the touch surface, the area is large and the crack-free construction is required unless it is kept below 2.5%. Turned out to be difficult. Therefore, the total amount of Al + Ti is set in the range of 0.5 to 2.5%. Needless to say, only one of Al and Ti can be added.

【0022】N:NはCrと窒化物を形成して硬さを安
定させる効果がある。しかし、0.01%未満ではその
効果がなく、また0.6%を超えると湯流れが悪く作業
性が低下する。したがって、N量は0.01〜0.6%の
範囲とする。
N: N has the effect of forming a nitride with Cr and stabilizing the hardness. However, if it is less than 0.01%, the effect is not obtained, and if it exceeds 0.6%, the flow of molten metal is poor and the workability is deteriorated. Therefore, the amount of N is set to the range of 0.01 to 0.6%.

【0023】更に、以下の成分の1種又は2種以上を適
量にて含有させる必要がある。
Furthermore, it is necessary to contain one or more of the following components in appropriate amounts.

【0024】Nb:Nbは高温硬さの安定化に効果があ
り、そのためには0.2%以上が必要である。しかし、
0.8%を超えると溶接割れが発生するので、Nb量は
0.2〜0.8%の範囲とする。
Nb: Nb is effective in stabilizing high temperature hardness, and for this purpose, 0.2% or more is required. But,
If it exceeds 0.8%, weld cracking will occur, so the Nb content should be in the range of 0.2 to 0.8%.

【0025】Mn:Mnは固溶体強化により常温硬さの向
上と作業性改善に効果があるが、2%を超えると逆にス
ラグが多くなり、なじみ不良となるので、Mn量は2%
以下とする。
Mn: Mn has the effect of improving the room temperature hardness and workability by solid solution strengthening, but if it exceeds 2%, slag will increase on the contrary, resulting in poor compatibility, so the amount of Mn is 2%.
Below.

【0026】W、Mo:W、MoはMnと同じく固溶体強
化の効果があるが、作業性には殆ど影響しない。しか
し、それぞれ5%を超える添加は耐割れ性を阻害するの
で、W、Mo量はともに5%以下とする。
W, Mo: W and Mo have the same solid solution strengthening effect as Mn, but have little effect on workability. However, addition of more than 5% impairs crack resistance, so the W and Mo contents are both set to 5% or less.

【0027】Fe:Feは硬さ安定と耐割れ性改善に効果
がある。但し、耐食性を悪くするため、添加量は5%以
下とする。
Fe: Fe is effective in stabilizing hardness and improving crack resistance. However, the amount added is 5% or less in order to deteriorate the corrosion resistance.

【0028】V:Vは3%以下の添加で500℃までの
硬さを安定にする。
V: V stabilizes the hardness up to 500 ° C. by adding 3% or less.

【0029】残部:残部は実質的にNiである。Niは合
金のベース材となるものであり、Al、Ti、Nb等と金
属間化合物を形成し、合金としての硬さを得る。ベース
材としては他にFe、Coが一般的に考えられるが、Fe
は硬さが十分に得られず、また耐酸化性も不十分であ
る。Coのみでは硬さが十分得られない。Niの一部をC
oで置換しても同様の効果が得られる。なお、不可避的
不純物はできるだけ少ないのが望ましい。
Remainder: The balance is substantially Ni. Ni serves as a base material of the alloy, and forms an intermetallic compound with Al, Ti, Nb, etc. to obtain hardness as an alloy. Fe and Co are generally considered as other base materials.
Has insufficient hardness, and its oxidation resistance is insufficient. Hardness cannot be obtained sufficiently only with Co. Part of Ni is C
The same effect can be obtained by replacing with o. It is desirable that the inevitable impurities are as small as possible.

【0030】次に本発明における肉盛溶接施工法につい
て説明する。
Next, the overlay welding method of the present invention will be described.

【0031】上述の本発明の肉盛材料は加工性が悪く、
ワイヤ状材料を得ることは難しく、したがって、MIG
施工は困難である。また、被覆アーク溶接では耐ブロー
ホール性が極めて悪く、適用が難しい。そのため、溶接
法について検討した結果、鋳造棒を用いるTIG施工
と、粉末材料を用いるPTA施工が適用可能である。
The above-mentioned overlay material of the present invention has poor workability,
Obtaining wire-like material is difficult and therefore MIG
Construction is difficult. Further, in the covered arc welding, blowhole resistance is extremely poor and it is difficult to apply. Therefore, as a result of examining the welding method, TIG construction using a casting rod and PTA construction using a powder material are applicable.

【0032】本発明の肉盛材料は、耐食性は極めて優れ
ているが、大型弁棒の触火面のような広い面積の肉盛で
は溶接時に割れが発生し易く、施工面での十分な検討が
必要であった。この点に関して、TIG施工とPTA施
工を比較すると、溶接金属の清浄度と自動溶接の安定性
からPTA施工の方が割れが発生しにくいことが判明し
た。特に300mmφ以上の大型弁棒では、TIG施工で
割れのない施工は困難である。更に大型弁棒に割れのな
い安定した施工を行うには、以下に示すように、肉盛手
順、熱管理が重要であることが判明した。
The overlay material of the present invention is extremely excellent in corrosion resistance, but cracks tend to occur during welding when overlaying a large area, such as the touch surface of a large valve rod, and cracks tend to occur during welding. Was needed. In this respect, when comparing the TIG construction and the PTA construction, it was found that cracking is less likely to occur in the PTA construction because of the cleanliness of the weld metal and the stability of automatic welding. In particular, with a large valve rod of 300 mmφ or more, it is difficult to perform TIG without cracks. Furthermore, in order to carry out stable construction without cracks on the large valve rod, it was found that the build-up procedure and heat management are important, as shown below.

【0033】〈積層法〉積層法としては、渦巻状で、触
火面中心部から外へ向かう施工が最も有効である。同心
円状の渦巻とすることで応力は均一化される。逆に、外
側から内側へ向かう施工では、外側を拘束した状態での
施工となり、割れの危険が大きくなる。応力の均一化で
は他のブロック法や対称法等もあるが、いずれも間欠的
な施工となり、効率が極めて悪くなる。
<Lamination Method> As the lamination method, a spiral-shaped construction is most effective in which the work is directed outward from the center of the touch surface. The stress is made uniform by using concentric spirals. On the other hand, when the construction is performed from the outside to the inside, the construction is performed with the outside constrained, and the risk of cracking increases. There are other block methods and symmetry methods for equalizing the stress, but all of them are intermittent, resulting in extremely poor efficiency.

【0034】〈予熱温度〉予熱温度は弁棒の大きさによ
り最適値は異なる。150mmφ以下の弁棒では、予熱な
しでは割れのない施工も可能であるが、なじみを良く
し、融合不良などの発生を少なくするために、適度な予
熱は有効であり、200℃以上の予熱が望ましい。
<Preheating Temperature> The optimum value of the preheating temperature depends on the size of the valve rod. For valve rods with a diameter of 150 mm or less, crack-free construction is possible without preheating, but proper preheating is effective and preheating above 200 ° C is effective in order to improve familiarity and reduce the occurrence of fusion defects. desirable.

【0035】一方、弁棒の傘径が大きくなると割れ感受
性は急激に高くなるため、予熱管理が最も重要なポイン
トとなる。種々の大きさの弁棒で施工条件を検討した結
果、傘径をD(mm)とすると、150mmφを超える弁棒の
場合、予熱の最適温度は200+(D−150)×0.5
℃以上で、割れのない施工が可能となった。
On the other hand, as the diameter of the valve stem increases, the susceptibility to cracking increases rapidly, so preheating control is the most important point. As a result of examining the construction conditions with valve rods of various sizes, assuming that the umbrella diameter is D (mm), the optimum temperature for preheating is 200 + (D-150) x 0.5 for valve rods that exceed 150 mmφ.
At temperatures above ℃, construction without cracks became possible.

【0036】〈後熱処理〉肉盛溶接後、必要に応じて時
効熱処理を行ってもよい。本発明による肉盛部は肉盛溶
接ままでもHv350程度以上の硬さが得られ、一般的
な使用では十分な耐摩耗性であるが、より厳しい環境下
で使われる場合には、600〜950℃×4〜100hr
の時効熱処理により硬さを向上させるのが望ましい。
<Post-Heat Treatment> After the overlay welding, an aging heat treatment may be performed if necessary. The build-up portion according to the present invention can obtain a hardness of about Hv350 or more even in the build-up welding as it is, and has sufficient wear resistance in general use, but 600 to 950 when used in a more severe environment. ℃ x 4-100hr
It is desirable to improve the hardness by aging heat treatment.

【0037】なお、弁棒の傘径が300mmφ以上の場合
は通常、2層盛以上の肉盛を行うが、その際、1層目の
肉盛材料として、Al+Ti合計量を0.5〜1.0%、N
b量を0.4%以下とした組成のものを用いるのが好まし
い。Al+Ti合計量が1.0%以上、またNb量が0.4
%以上では1層目の硬さが高くなり、2層溶接時に割れ
が発生し易くなる。
When the diameter of the stem of the valve rod is 300 mmφ or more, the overlaying of two or more layers is usually performed. At this time, the total amount of Al + Ti is 0.5 to 1 as the overlaying material of the first layer. 0.0%, N
It is preferable to use a composition having a b content of 0.4% or less. The total amount of Al + Ti is 1.0% or more, and the amount of Nb is 0.4.
%, The hardness of the first layer is high, and cracks are likely to occur during welding of the two layers.

【0038】以上の肉盛施工法により、触火面に上記肉
盛材料による肉盛金属が得られる。なお、肉盛金属は、
肉盛層部分、或いはこの肉盛層を含めて肉盛層表面下少
なくとも1mmまでの領域に相当する部分である。
By the above-mentioned build-up construction method, a build-up metal of the above-mentioned build-up material can be obtained on the touch surface. The overlay metal is
The overlay layer portion or a portion including the overlay layer and corresponding to an area of at least 1 mm below the surface of the overlay layer.

【0039】次に本発明の実施例を示す。Next, examples of the present invention will be shown.

【0040】[0040]

【実施例1】[Example 1]

【0041】本例は肉盛金属の耐食性及び硬さ(耐摩耗
性)を調べた例である。表1に示す組成の肉盛粉末材料
を用い、母材(SUS304:30mmt×150mmφ)上
にPTA施工(予熱温度:200〜250℃、積層法:
渦巻状で中心より外側へのビード形成)により2層の肉
盛溶接を行い、肉盛層の表面硬さ及び耐食性を調べた。
耐食性は、肉盛表面の溶着金属から3mm(径)×30mm
(長さ)の試験片を採取し、20%V25+80%Na2
4の腐食灰中で900℃×50hr浸漬した後の腐食減
量(mg)を測定して評価した。その結果を表1に併記す
る。
This example is an example of examining the corrosion resistance and hardness (wear resistance) of the overlay metal. Using the build-up powder material having the composition shown in Table 1, PTA construction (preheating temperature: 200 to 250 ° C., laminating method: on the base material (SUS304: 30 mmt × 150 mmφ)
Two layers of overlay welding were performed by forming a bead in a spiral shape from the center to the outside), and the surface hardness and corrosion resistance of the overlay layer were examined.
Corrosion resistance is 3 mm (diameter) x 30 mm from the weld metal on the overlay surface
Take a test piece of (length), 20% V 2 O 5 + 80% Na 2 S
O 4 corrosion weight loss after immersion 900 ° C. × 50 hr corrosion ashes in the (mg) was evaluated by measuring. The results are also shown in Table 1.

【0042】表1に示すように、本発明例は全て優れた
耐食性を示し、硬さもHv380以上で良好な耐摩耗性
も期待できる。
As shown in Table 1, all the examples of the present invention show excellent corrosion resistance, and the hardness is Hv380 or more, and good abrasion resistance can be expected.

【0043】一方、比較例No.1〜4、7〜8は、耐食
成分が全て本発明範囲内のため、耐食性は良好である。
しかし、比較例No.1ではAl+Tiが少なく硬さが低く
なっている。比較例No.2〜4、7では割れが発生し
た。比較例No.6はMnが高く融合不良を発生した。比
較例No.8はCが高く硬くなりすぎ、割れが発生した。
また比較例No.5はCrが低く耐食性が不充分である。
On the other hand, Comparative Examples Nos. 1 to 4 and 7 to 8 have good corrosion resistance because all the corrosion resistant components are within the scope of the present invention.
However, in Comparative Example No. 1, Al + Ti is small and the hardness is low. In Comparative Examples No. 2 to 4 and 7, cracking occurred. Comparative Example No. 6 had a high Mn and failed to fuse. Comparative Example No. 8 had a high C content and became too hard, and cracking occurred.
Further, Comparative Example No. 5 has low Cr and insufficient corrosion resistance.

【0044】[0044]

【表1】 [Table 1]

【0045】[0045]

【実施例2】Example 2

【0046】本例は実際の弁棒に肉盛溶接した例であ
る。傘径150〜450mmφの弁棒(母材:オーステナ
イト耐熱ステンレス鋼SUH-36)の触火面にPTA施
工で肉盛を行った。表1の肉盛粉末材料と表2の施工条
件を表3のように組み合わせた。溶接作業性を調べた結
果を表3に示す。
This example is an example of overlay welding on an actual valve rod. PTA construction was applied to the fired surface of a valve rod (base material: austenite heat-resistant stainless steel SUH-36) having an umbrella diameter of 150 to 450 mmφ and built up. The build-up powder material of Table 1 and the construction conditions of Table 2 were combined as shown in Table 3. Table 3 shows the results of examining the welding workability.

【0047】表3において、本発明例(イ)〜(ホ)は、全
て割れのない良好な溶接結果が得られている。
In Table 3, the invention examples (a) to (e) all show good welding results without cracks.

【0048】これに対し、比較例(い)〜(に)では、肉盛
粉末材料は本発明範囲内の組成を用いているが、施工条
件が不備のため、割れ発生となっている。
On the other hand, in Comparative Examples (1) to (2), the build-up powder material has a composition within the range of the present invention, but cracks are generated due to inadequate construction conditions.

【0049】比較例(ほ)〜(ぬ)では、肉盛粉末材料が本
発明範囲外の組成で高く外れているため、施工条件は適
正であっても、割れやスラグ巻込み、ブローホール等を
発生した。比較例(る)〜(を)も従来材粉末を用いたもの
で、割れを発生した。
In Comparative Examples (H) to (N), since the build-up powder material is highly deviated with a composition outside the scope of the present invention, cracks, slag entrainment, blowholes, etc. may occur even if the construction conditions are appropriate. Occurred. Comparative examples (r) to () also used the conventional material powder and cracked.

【0050】[0050]

【表2】 [Table 2]

【0051】[0051]

【表3】 [Table 3]

【0052】[0052]

【発明の効果】以上詳述したように、本発明によれば、
耐摩耗性は勿論のこと、耐食性に優れると共に耐割れ性
等の作業性も優れた触火面を有するディーゼル機関用弁
棒を従来より安価に提供することができる。特に大型弁
棒で広い面積の触火面の肉盛に適している。
As described in detail above, according to the present invention,
It is possible to provide a valve rod for a diesel engine, which has not only wear resistance but also corrosion resistance and workability such as crack resistance, which is excellent in workability, at a lower cost than before. Especially, it is suitable for overlaying a large area on the touch surface of a large valve rod.

【図面の簡単な説明】[Brief description of drawings]

【図1】弁棒を説明する断面図である。FIG. 1 is a cross-sectional view illustrating a valve rod.

【符号の説明】[Explanation of symbols]

1 弁棒 2 傘 3 触火面 4 フェース面 1 Valve stem 2 Umbrella 3 Touch surface 4 Face surface

───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中忠夫 東京都町田市南成瀬3−12−8 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadao Tanaka 3-12-8 Minami Naruse, Machida City, Tokyo

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 耐熱鋼よりなる舶用又は発電用ディーゼ
ル機関用弁棒であって、その触火面に肉盛金属を有し、
該肉盛金属の組成が、C:0.01〜0.50%、Si:
0.1〜2.0%、Cr:35〜55%、Al+Ti:0.5
〜2.5%、N:0.01〜0.6%を含有し、更にMn:
2%以下、V:3%以下、Nb:0.2〜0.8%、Mo:
5%以下、W:5%以下、Fe:5%以下の1種又は2
種以上を含有し、残部が実質的にNi又はNi+Coと不
可避的不純物からなる組成であることを特徴とするディ
ーゼル機関用弁棒。
1. A valve rod for a marine vessel or a diesel engine for power generation, which is made of heat-resistant steel, and has a build-up metal on a fired surface thereof,
The composition of the overlay metal is C: 0.01 to 0.50%, Si:
0.1-2.0%, Cr: 35-55%, Al + Ti: 0.5
.About.2.5%, N: 0.01 to 0.6%, and Mn:
2% or less, V: 3% or less, Nb: 0.2 to 0.8%, Mo:
5% or less, W: 5% or less, Fe: 5% or less, one or two
A valve stem for a diesel engine, characterized in that it contains at least one species and the balance is substantially Ni or Ni + Co and inevitable impurities.
【請求項2】 弁棒の素材が鍛造加工したオーステナイ
ト耐熱鋼である請求項1に記載のディーゼル機関用弁
棒。
2. The valve rod for a diesel engine according to claim 1, wherein the material of the valve rod is forged austenitic heat resistant steel.
【請求項3】 耐熱鋼よりなる舶用又は発電用ディーゼ
ル機関用弁棒の触火面にPTA溶接により肉盛金属を形
成するに際し、溶接材料として、C:0.01〜0.5
0%、Si:0.1〜2.0%、Cr:35〜55%、Al
+Ti:0.5〜2.5%、N:0.01〜0.6%を含有
し、更にMn:2%以下、V:3%以下、Nb:0.2〜
0.8%、Mo:5%以下、W:5%以下、Fe:5%以
下の1種又は2種以上を含有し、残部が実質的にNi又
はNi+Coと不可避的不純物からなる組成の溶接材料を
用い、予熱温度を、傘径150mmφ以下の弁棒の場合
は200℃以上、傘径150mmを超える弁棒の場合は2
00+(D−150)×0.5℃以上(ここで、D:弁棒
の傘径(mm))とし、触火面中心部から外へ渦巻状にビ
ードを形状する施工法で行うことを特徴とするディーゼ
ル機関用弁棒の製造方法。
3. When forming a build-up metal by PTA welding on a fired surface of a valve rod for a marine vessel or a diesel engine for power generation made of heat resistant steel, as a welding material, C: 0.01 to 0.5 is used.
0%, Si: 0.1 to 2.0%, Cr: 35 to 55%, Al
+ Ti: 0.5-2.5%, N: 0.01-0.6%, Mn: 2% or less, V: 3% or less, Nb: 0.2-
Welding with a composition containing 0.8%, Mo: 5% or less, W: 5% or less, Fe: 5% or less, one or two or more, and the balance being substantially Ni or Ni + Co and inevitable impurities. Preheating temperature is 200 ° C or more for valve rods with a diameter of 150 mm or less and 2 for valve rods with a diameter of 150 mm or more.
00+ (D-150) × 0.5 ° C or higher (where D: valve stem diameter (mm)), and use a construction method that forms a bead in a spiral shape from the center of the ignition surface to the outside. A method for manufacturing a valve stem for a diesel engine, which is characterized.
【請求項4】 請求項3に記載の方法において、傘径が
300mmφ以上の弁棒に対して2層盛以上の肉盛を行う
に際し、1層目の溶接材料として、請求項3に記載の溶
接材料の成分のうち、Al+Ti:0.5〜1.0%、N
b:0.4%以下に規制した溶接材料を用い、2層目の溶
接材料として請求項3に記載の溶接材料を用いることを
特徴とするディーゼル機関用弁棒の製造方法。
4. The method according to claim 3, wherein when the valve rod having an umbrella diameter of 300 mmφ or more is overlaid with two or more layers, the welding material of the first layer is used. Of the components of the welding material, Al + Ti: 0.5-1.0%, N
b: A method for producing a valve rod for a diesel engine, which comprises using a welding material regulated to 0.4% or less and using the welding material according to claim 3 as a second layer welding material.
【請求項5】 肉盛溶接後、600〜950℃×4〜1
00hrの時効熱処理を行う請求項3又は4に記載の方
法。
5. After overlay welding, 600 to 950 ° C. × 4 to 1
The method according to claim 3 or 4, wherein an aging heat treatment for 00 hr is performed.
【請求項6】 弁棒の素材が鍛造加工したオーステナイ
ト耐熱鋼である請求項3、4又は5に記載の方法。
6. The method according to claim 3, 4 or 5, wherein the material of the valve rod is forged austenitic heat resistant steel.
JP9205993A 1993-03-26 1993-03-26 Valve stem for diesel engine and its manufacture Pending JPH06277876A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9205993A JPH06277876A (en) 1993-03-26 1993-03-26 Valve stem for diesel engine and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9205993A JPH06277876A (en) 1993-03-26 1993-03-26 Valve stem for diesel engine and its manufacture

Publications (1)

Publication Number Publication Date
JPH06277876A true JPH06277876A (en) 1994-10-04

Family

ID=14043924

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9205993A Pending JPH06277876A (en) 1993-03-26 1993-03-26 Valve stem for diesel engine and its manufacture

Country Status (1)

Country Link
JP (1) JPH06277876A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009275699A (en) * 2008-05-13 2009-11-26 Man Diesel Filial Af Man Diesel Se Tyskland Exhaust valve for large-sized two-cycle diesel engine, process for reducing formation of nox in such engine, and such engine
EP2682571A1 (en) * 2012-07-06 2014-01-08 Man Diesel & Turbo, Filial Af Man Diesel & Turbo Se, Tyskland An exhaust valve spindle for an exhaust valve in an internal combustion engine and a method of manufacturing the exhaust valve spindle
EP2743024A1 (en) * 2012-12-11 2014-06-18 Wärtsilä Schweiz AG Gas exchange valve, and method for producing a gas exchange valve
JP2014111265A (en) * 2012-12-05 2014-06-19 Sanyo Special Steel Co Ltd Cladding powder alloy

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009275699A (en) * 2008-05-13 2009-11-26 Man Diesel Filial Af Man Diesel Se Tyskland Exhaust valve for large-sized two-cycle diesel engine, process for reducing formation of nox in such engine, and such engine
JP4510126B2 (en) * 2008-05-13 2010-07-21 エムエーエヌ・ディーゼル・フィリアル・アフ・エムエーエヌ・ディーゼル・エスイー・ティスクランド Exhaust valves for large two-cycle diesel engines, processes for reducing NOx formation in such engines, and such engines
US8869511B2 (en) 2008-05-13 2014-10-28 Man Diesel & Turbo, Filial Af Man Diesel & Turbo Se, Tyskland Exhaust valve for a large sized two stroke diesel engine, process for reduction on NOx-formation in such an engine and such engine
EP2682571A1 (en) * 2012-07-06 2014-01-08 Man Diesel & Turbo, Filial Af Man Diesel & Turbo Se, Tyskland An exhaust valve spindle for an exhaust valve in an internal combustion engine and a method of manufacturing the exhaust valve spindle
CN103527281A (en) * 2012-07-06 2014-01-22 曼恩柴油机涡轮股份公司曼恩柴油机涡轮德国分公司 Exhaust valve spindle for an exhaust valve in an internal combustion engine
JP2014088610A (en) * 2012-07-06 2014-05-15 Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland Exhaust valve spindle for exhaust valve in internal combustion engine
JP2016027255A (en) * 2012-07-06 2016-02-18 マン ディーゼル アンド ターボ フィリアル エーエフ マン ディーゼル アンド ターボ エスイー ティスクランド Exhaust valve spindle for exhaust valve in internal combustion engine
US9464730B2 (en) 2012-07-06 2016-10-11 Man Diesel & Turbo. Filial Af Man Diesel & Turbo Se. Tyskland Exhaust valve spindle for an exhaust valve in an internal combustion engine
US9714724B2 (en) 2012-07-06 2017-07-25 Man Diesel & Turbo. Filial Af Man Diesel & Turbo Se. Tyskland Exhaust valve spindle for an exhaust valve in an internal combustion engine
JP2014111265A (en) * 2012-12-05 2014-06-19 Sanyo Special Steel Co Ltd Cladding powder alloy
EP2743024A1 (en) * 2012-12-11 2014-06-18 Wärtsilä Schweiz AG Gas exchange valve, and method for producing a gas exchange valve

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