JP2002001579A - WELDING WIRE FOR LOW-Cr-CONTENT, HIGH-STRENGTH, HIGH- TOUGHNESS HEAT-RESISTING STEEL - Google Patents
WELDING WIRE FOR LOW-Cr-CONTENT, HIGH-STRENGTH, HIGH- TOUGHNESS HEAT-RESISTING STEELInfo
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、ボイラ等の熱交換
器などの高温高圧環境下で使用される高い靭性と高温強
度を有する耐熱鋼を溶接する際の溶接材料に関するもの
であり、さらに詳しくは、溶接に際して予熱及び後熱処
理を行うことなく高い室温強度、500℃以上の高温に
おけるクリープ特性、靭性、耐低温割れ性に優れた溶接
金属を与える溶接材料に係わるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding material for welding heat-resistant steel having high toughness and high-temperature strength used in a high-temperature and high-pressure environment such as a heat exchanger of a boiler or the like. The present invention relates to a welding material which gives a weld metal having high room temperature strength, creep characteristics at high temperatures of 500 ° C. or higher, toughness, and low-temperature cracking resistance without performing preheating and post-heating during welding.
【0002】[0002]
【従来の技術】一般にボイラ用、化学工業用、原子力用
等の高温耐熱耐圧部材にはオーステナイト系ステンレス
鋼、Cr含有量が9〜12%(以下、%は、説明がない
限り質量%を意味する。)の高Crフェライト鋼、Cr
含有量が3%以下の低Crフェライト鋼あるいは炭素鋼
等の材料が用いられている。そして、これらは対象とな
る部材の使用温度、圧力等の使用環境に経済性を考慮し
て適宜選択される。2. Description of the Related Art Generally, high-temperature and heat-resistant members for boilers, chemical industries, nuclear power, and the like are used for austenitic stainless steel and have a Cr content of 9 to 12% (hereinafter,% means mass% unless otherwise specified). High Cr ferritic steel, Cr
Materials such as low Cr ferrite steel or carbon steel having a content of 3% or less are used. These are appropriately selected in consideration of economy in use environment such as use temperature and pressure of the target member.
【0003】これらの材料のうちで、Cr含有量が3%
以下の低Crフェライト鋼は、炭素鋼に比べてCrの作
用により耐酸化性、高温耐食性及び高温強度に優れ、オ
ーステナイト系ステンレス鋼に比べて格段に安価で、且
つ熱膨張係数が小さくて応力腐食割れを起こさないこ
と、さらには高Cr系フェライト系鋼に比べても安価で
あって靭性、熱伝導性及び溶接性に優れている等の特徴
を有している。[0003] Among these materials, the Cr content is 3%.
The following low Cr ferritic steels are superior in oxidation resistance, high-temperature corrosion resistance and high-temperature strength due to the action of Cr compared to carbon steel, are significantly cheaper than austenitic stainless steel, and have a small thermal expansion coefficient and stress corrosion. It has features that it does not crack, and that it is inexpensive and superior in toughness, thermal conductivity and weldability compared to high Cr ferritic steel.
【0004】このように比較的安価で高強度な低Cr系
フェライト系鋼は、現在、多くの研究開発がされ、実用
化されている。[0004] Such relatively inexpensive and high-strength low Cr ferritic steels have been extensively researched and developed and put to practical use.
【0005】これら低Crフェライト鋼のうち1〜1.
25Cr−0.5〜1Mo系の低Crフェライト鋼は、
ボイラ用鋼板やタービン用材料として良く用いられてい
る。[0005] Among these low Cr ferritic steels, 1-1.
25Cr-0.5 ~ 1Mo low Cr ferritic steel is
It is often used as a steel plate for boilers and a material for turbines.
【0006】上述の1〜1.25Cr−0.5〜1Mo
系の低Crフェライト鋼の溶接施工に際しては通常、共
金系の溶接ワイヤが使用される。社団法人溶接協会特殊
材料溶接研究委員会編「金属材料溶接・接合施工データ
集 ’94」p.1〜5に記載されているように、15
0℃以上の溶接予熱処理、670〜680℃で1〜2.
5時間程度の溶接後熱処理が適用される。このような溶
接の際の予熱処理は、溶接後の水素による低温割れの防
止を目的とし、また後熱は溶接金属の靭性の向上等を目
的としているが、部材の製造工期及び製造コストを高め
る原因となる。The above-mentioned 1-1.25Cr-0.5-1Mo
When welding low Cr ferritic steels, a common metal welding wire is usually used. Special Materials Welding Research Committee of the Japan Welding Association, “Metallic Material Welding and Joining Work Data Collection '94” p. As described in 1-5, 15
Weld pre-heat treatment at 0 ° C or higher, 1-2 at 670-680 ° C.
A post-weld heat treatment of about 5 hours is applied. The pre-heat treatment at the time of such welding is intended to prevent low-temperature cracking due to hydrogen after welding, and the post-heat is intended to improve the toughness of the weld metal, etc., but increases the production period and production cost of the member. Cause.
【0007】従来、溶接予熱及び後熱処理の省略のひと
つの手段として、溶接金属の強度を下げる方法が用られ
ていた。Heretofore, as one means of omitting welding preheating and post-heating, a method of reducing the strength of a weld metal has been used.
【0008】しかしながら、近年の低Crフェライト系
鋼の高強度化に伴い、構造物の安全性確保の観点から溶
接金属も母材と同等の室温強度、具体的には750MP
a程度の室温での引張強度を有することが要求される。However, with the recent increase in the strength of low Cr ferritic steels, the weld metal has a room temperature strength equivalent to that of the base metal, specifically 750 MPa, from the viewpoint of ensuring the safety of the structure.
It is required to have a tensile strength at room temperature of about a.
【0009】既に、主として2.25Cr系の低Crフ
ェライト鋼を対象とし、溶接予熱及び後熱処理を省略で
きる高強度フェライト系耐熱鋼用溶接材料が、例えば、
特開平10−58187号公報等により提案されてい
る。しかしながら、特開平10−58187号公報で提
案されている溶接材料の成分は、Crを0.8〜2.5
%含有しているものの、Moが0.3%以下と少ないた
めに、1.25%Cr鋼に適用した場合、母材強度を十
分に上回る室温引張強度、高温強度、クリープ特性が得
られない。[0009] High-strength ferritic heat-resistant steel welding materials, which are mainly intended for 2.25Cr-based low Cr ferritic steels and which can omit welding preheating and post-heating, are already known, for example.
It is proposed in Japanese Patent Application Laid-Open No. 10-58187. However, the component of the welding material proposed in Japanese Patent Application Laid-Open No. H10-58187 has a Cr content of 0.8 to 2.5.
%, But Mo is as low as 0.3% or less, so that when applied to 1.25% Cr steel, room temperature tensile strength, high temperature strength, and creep properties sufficiently exceeding the base metal strength cannot be obtained. .
【0010】[0010]
【発明が解決しようとする課題】このような従来技術の
問題点に鑑みて、本発明はCrを1.5%以下含有する
低Crフェライト系耐熱鋼に適用される溶接において、
溶接予熱及び後熱処理を省略しても500℃以上の高温
におけるクリープ特性、靭性、耐低温割れ性に優れた溶
接金属を得ることが可能な共金系溶接ワイヤを提供する
ことを目的とする。SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present invention provides a method for welding low Cr ferritic heat resistant steel containing 1.5% or less of Cr.
An object of the present invention is to provide a co-metallic welding wire capable of obtaining a weld metal having excellent creep characteristics, toughness, and low-temperature cracking resistance at a high temperature of 500 ° C. or higher even if welding preheating and post-heating are omitted.
【0011】[0011]
【課題を解決するための手段】本発明は、上記課題を解
決するものであり、その要旨とするところは、以下の通
りである。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the gist thereof is as follows.
【0012】(1) 質量%(以下同じ)で、C:0.
03〜0.09%、Si:0.05〜0.3%、Mn:
0.02〜0.9%、P:0.025%以下、S:0.
015%以下、Cr:0.8〜1.5%、Mo:0.4
〜1.2%、W:0.004〜1.5%、Ni:0.1
%未満、N:0.0005〜0.01%、O:0.00
8%以下を含有し、さらにV:0.1〜0.7%、N
b:0.01〜0.1%、Ta:0.01〜0.1%の
内の1種もしくは2種以上を含有し、残部がFe及び不
可避的不純物からなり、溶接予熱及び後熱処理の省略が
可能であり、且つ高強度、高靭性、高クリープ強度であ
る溶接金属が得られることを特徴とする低Cr系高強度
高靭性耐熱鋼用溶接ワイヤ。(1) In mass% (the same applies hereinafter), C: 0.
03-0.09%, Si: 0.05-0.3%, Mn:
0.02-0.9%, P: 0.025% or less, S: 0.
015% or less, Cr: 0.8 to 1.5%, Mo: 0.4
-1.2%, W: 0.004-1.5%, Ni: 0.1
%, N: 0.0005 to 0.01%, O: 0.00
8% or less, V: 0.1 to 0.7%, N
b: 0.01 to 0.1%, Ta: one or more of 0.01 to 0.1%, the balance being Fe and unavoidable impurities, the balance of welding preheating and post heat treatment. A welding wire for a low Cr-based high-strength and toughness heat-resistant steel, wherein a welding metal having high strength, high toughness, and high creep strength can be obtained and can be obtained.
【0013】[0013]
【発明の実施の形態】本発明は溶接ワイヤ中の、ワイヤ
中に適正な組合せで適正量の合金を添加することによ
り、高温クリープ強度、靭性を確保すると共に、溶接予
後熱の省略を可能にした。以下に成分の限定理由を示
す。なお、%は、説明がない限り質量%を意味する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention ensures high-temperature creep strength and toughness by adding an appropriate amount of alloy in an appropriate combination to a welding wire, and enables elimination of welding prognostic heat. did. The reasons for limiting the components are shown below. In addition,% means mass% unless otherwise described.
【0014】C:Cは焼入れ性を高め、侵入型固溶元素
として室温強度を向上させる。また、炭化物形成元素と
して高温強度も向上させる。さらに極度にCが低すぎる
とデルタ凝固を起因とする高温割れが溶接金属に発生す
るので、Cは0.03%以上必要である。しかしなが
ら、0.09%を超えてワイヤに含有されると、予後熱
を省略した際に低温割れが起きるので、上限を0.09
%に定めた。C: C enhances hardenability and improves room temperature strength as an interstitial solid solution element. It also improves high-temperature strength as a carbide-forming element. Further, when C is extremely low, a hot crack due to delta solidification occurs in the weld metal, so C needs to be 0.03% or more. However, if the content exceeds 0.09% in the wire, low-temperature cracking occurs when the prognostic heat is omitted, so the upper limit is set to 0.09%.
%.
【0015】Si:Siは、脱酸材として0.05%以
上添加するものであるが、また耐酸化性を向上させる元
素でもある。しかし0.3%を超えると予後熱を省略し
た際に強度が過剰となって低温割れが発生するうえ、靭
性の低下を招くので、上限を0.3%と定めた。Si: Si is added as a deoxidizing material in an amount of 0.05% or more, and is also an element for improving oxidation resistance. However, if it exceeds 0.3%, when the prognostic heat is omitted, the strength becomes excessive and low-temperature cracking occurs, and the toughness is reduced. Therefore, the upper limit is set to 0.3%.
【0016】Mn:Mnは脱酸のためのみでなく、強度
保持上も必要な成分である。上限を0.9%としたの
は、これを越すと予後熱を省略した際に強度が過剰とな
って低温割れが発生するうえ、靭性を低下させるからで
あり、下限は脱酸に必要な量として0.02%と定め
た。Mn: Mn is a component necessary not only for deoxidation but also for maintaining strength. The reason why the upper limit is set to 0.9% is that if it exceeds this, when the prognostic heat is omitted, the strength becomes excessive and low-temperature cracking occurs, and also the toughness is lowered. The amount was determined to be 0.02%.
【0017】P:Pは靭性に有害な不可避的な成分であ
り、できるだけ少ないほうが望ましい。このため、本発
明では、その含有量の上限を0.025%に規定した。P: P is an inevitable component harmful to toughness, and it is desirable that P be as small as possible. Therefore, in the present invention, the upper limit of the content is set to 0.025%.
【0018】S:SもPと同様に靭性に有害な不可避的
な成分であり、できるだけ少ないほうが望ましい。この
ため、本発明では、その含有量の上限を0.015%に
規定した。S: S, like P, is an inevitable component that is harmful to toughness. For this reason, in the present invention, the upper limit of the content is defined as 0.015%.
【0019】Cr:Crは高温強度、高温での耐酸化
性、クリープ強度を確保するために、0.8%以上は必
要である。しかし、1.5%を超えて含有されると、共
金系溶接ワイヤであることの利点が失われ、溶接ワイヤ
のコストが過剰に高くなるので上限を1.5%とした。Cr: Cr is required to be 0.8% or more in order to ensure high-temperature strength, high-temperature oxidation resistance, and creep strength. However, if the content exceeds 1.5%, the advantage of being a common metal-based welding wire is lost, and the cost of the welding wire becomes excessively high. Therefore, the upper limit is set to 1.5%.
【0020】Ni:本発明では、Niは、オーステナイ
ト安定化元素であり、靱性改善作用を有するが、高温ク
リープ特性を劣化させるので、極力低減されることが望
ましく、本発明ではその含有量を0.1%未満とする。Ni: In the present invention, Ni is an austenite stabilizing element and has an effect of improving toughness. However, since it deteriorates high-temperature creep characteristics, it is desirable that Ni be reduced as much as possible. ... less than 1%.
【0021】Mo:Moは、室温強度を高め、さらに高
温強度及びクリープ強度を顕著に高める元素であるの
で、0.4%以上は必要である。しかし、多量に添加さ
れた場合溶接性を損ない、予後熱の省略時に著しい靭性
の低下を招くので、含有量の上限を1.2%とした。Mo: Mo is an element which enhances the strength at room temperature, and further remarkably enhances the strength at high temperature and the creep strength, so that at least 0.4% is necessary. However, when added in a large amount, the weldability is impaired and the toughness is significantly reduced when the prognostic heat is omitted, so the upper limit of the content is set to 1.2%.
【0022】W:WもMoと同様に高温強度を顕著に高
める元素である。本発明ではMoを0.4%以上含有し
ているので、必ずしも多量のWが含有される必要はない
が、Moと複合添加されることで、高温強度の改善効果
がある。このような効果はWの含有量が0.004%未
満は皆無であるため、含有量の下限を0.004%とす
る。しかし、Wが多量に添加された場合は溶接性を損な
い、予後熱の省略時に著しい靭性の低下を招くので、上
限を1.5%とした。W: W is an element that remarkably enhances the high-temperature strength similarly to Mo. In the present invention, since Mo is contained at 0.4% or more, it is not always necessary to contain a large amount of W. However, the combined addition with Mo has an effect of improving high-temperature strength. Since such an effect does not exist when the content of W is less than 0.004%, the lower limit of the content is set to 0.004%. However, when a large amount of W is added, the weldability is impaired and the toughness is significantly reduced when the prognostic heat is omitted. Therefore, the upper limit is set to 1.5%.
【0023】N:Nは、 後続パスによる再熱領域及び
高温クリープ時にVまたはNbと結合して微細なVまた
はNbの炭窒化物の析出物を形成し、高温時の長時間ク
リープ強度を確保し、さらに結晶粒を微細化させるため
に0.0005%以上添加する必要があるが、0.01
%を超えると、予後熱の省略時に著しい靭性低下を生じ
るので上限を0.01%とした。N: N combines with V or Nb to form fine V or Nb carbonitride precipitates during the reheating region and high temperature creep in the subsequent pass, and secures long-term creep strength at high temperatures. In order to further refine the crystal grains, it is necessary to add 0.0005% or more.
%, The toughness is remarkably reduced when the heat of prognosis is omitted, so the upper limit was made 0.01%.
【0024】O:Oは、溶接時に不可避的成分として含
有するが、溶接予熱・後熱処理を省略する場合に、靭性
低下の原因になり有害成分であるから、できるだけ少な
いほうが望ましい。この理由により本発明では、その含
有量を0.008%以下とした。O: O is contained as an unavoidable component at the time of welding, but it is a harmful component that causes a decrease in toughness when welding preheating and post-heating treatment is omitted. For this reason, in the present invention, the content is set to 0.008% or less.
【0025】V、Nb、Ta:V及びNb、Taは、い
ずれも後続パスによる再熱領域及び高温クリープ時に微
細な炭窒化物を析出させて高温時に長時間クリープ強度
を確保し、Nb及びTaは、結晶粒を微細化して靭性を
与える元素としても必要な成分である。しかしながら、
過剰に添加すると、その効果が飽和してしまうだけでな
く溶接性や溶接予熱・後熱処理を省略する場合に、著し
い靭性低下が生じるのでその含有量の上限を規定する必
要がある。V, Nb, Ta: V, Nb, and Ta each deposit fine carbonitrides during reheating in a subsequent pass and during high-temperature creep to ensure long-term creep strength at high temperatures. Is a necessary component also as an element that refines crystal grains and imparts toughness. However,
Excessive addition not only saturates the effect, but also significantly reduces toughness when omitting weldability and welding preheating and post-heat treatment. Therefore, it is necessary to define the upper limit of the content.
【0026】このような理由から、本発明では、V及び
Nb、Taの含有量を、V:0.1〜0.7%、Nb:
0.01〜0.1%、Ta:0.01〜0.1%と規定
し、これらのうちの1種もしくは2種以上を選択的に含
有させる。For these reasons, in the present invention, the contents of V, Nb, and Ta are defined as V: 0.1 to 0.7%, Nb:
0.01 to 0.1%, Ta: 0.01 to 0.1%, and one or more of these are selectively contained.
【0027】以上の成分を含有するワイヤを用い、通常
のTIG溶接時の溶接条件、例えば溶接電流:160〜
240A、溶接電圧:7〜14V、溶接速度:7〜14
cm/min、ワイヤ送給量:5〜14g/min、ワ
イヤ径:1.2mm〜3.6mm等で溶接を行うことに
より、溶接予熱及び後熱処理を省略でき、且つ高強度、
高靭性、高クリープ強度である溶接金属が得られる。Using a wire containing the above components, welding conditions during normal TIG welding, for example, welding current: 160 to
240A, welding voltage: 7-14V, welding speed: 7-14
cm / min, wire feed rate: 5 to 14 g / min, wire diameter: 1.2 mm to 3.6 mm, etc., so that welding preheating and post heat treatment can be omitted, and high strength,
A weld metal having high toughness and high creep strength is obtained.
【0028】[0028]
【実施例】表1に示す化学組成の厚さ15mmの、1.
25Cr−0.5Mo−Nb−V鋼に、図1に示すよう
な開先(開先角度θ=45゜、ルートギャップL=6m
m)を形成し、表2に示す成分組成のワイヤ径1.6m
mφの溶接ワイヤを用い、表3に示す溶接条件でTIG
溶接した。得られた溶接金属から引張試験片、クリープ
破断試験及び2mmVシャルピー衝撃試験片を採取し、
これらの試験を行った。クリープ破断試験は付加応力1
00MPa、温度550℃の条件で行い、シャルピー衝
撃試験は0℃で行った。また、同鋼材とワイヤを用いて
JIS Z3157に従って「U形溶接割れ試験」を片
面U形開先で行ったのち断面割れ率を求めた。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A groove (groove angle θ = 45 °, root gap L = 6 m) as shown in FIG. 1 was added to 25Cr-0.5Mo-Nb-V steel.
m), and a wire diameter of 1.6 m having a component composition shown in Table 2.
TIG using a welding wire of mφ under the welding conditions shown in Table 3.
Welded. A tensile test specimen, a creep rupture test and a 2 mmV Charpy impact test specimen were collected from the obtained weld metal,
These tests were performed. Creep rupture test applied stress 1
The test was performed under the conditions of 00 MPa and a temperature of 550 ° C., and the Charpy impact test was performed at 0 ° C. Further, a "U-shaped welding crack test" was performed on one side of a U-shaped groove in accordance with JIS Z3157 using the same steel material and wire, and then the cross-sectional cracking rate was determined.
【0029】[0029]
【表1】 [Table 1]
【0030】[0030]
【表2】 [Table 2]
【0031】[0031]
【表3】 [Table 3]
【0032】表4に上記試験の結果を示す。Table 4 shows the results of the above test.
【0033】[0033]
【表4】 [Table 4]
【0034】比較例であるワイヤNo:W7は、C含有
量が本発明の規定範囲を高めに外れているために、溶接
金属の室温強度が過剰に高く、靭性が低いうえ、溶接低
温割れが発生している。The wire No .: W7, which is a comparative example, has a C content outside the specified range of the present invention, so that the room temperature strength of the weld metal is excessively high, the toughness is low, and the weld cold cracking is low. It has occurred.
【0035】比較例であるワイヤNo:W8は、脱酸元
素であるSi及びMn含有量が、本発明の規定範囲を低
めに外れているため、溶接金属の靭性が低くなった。In the wire No .: W8, which is a comparative example, the toughness of the weld metal was low because the contents of Si and Mn, which are deoxidizing elements, were out of the specified range of the present invention.
【0036】比較例であるワイヤNo:W9は、高温ク
リープ特性を改善するV、Nb、Taの何れの含有量も
本発明の規定範囲を低めに外れているため、十分なクリ
ープ破断寿命が得られなかった。Wire No. W9, which is a comparative example, has a sufficient creep rupture life because the contents of V, Nb, and Ta, which improve the high temperature creep properties, are all outside the specified range of the present invention. I couldn't.
【0037】比較例であるワイヤNo:W10は、C含
有量が本発明の規定範囲を低めに外れているために、十
分な室温強度及び高温クリープ破断寿命が得られていな
い。The wire No: W10, which is a comparative example, does not have sufficient room-temperature strength and high-temperature creep rupture life because the C content is outside the specified range of the present invention.
【0038】比較例であるワイヤNo:W11は、高温
クリープ強度に有害なNiが本発明の規定範囲より過剰
にワイヤに含有されているために、溶接金属の十分なク
リープ破断寿命が得られていない。The wire No .: W11, which is a comparative example, has a sufficient creep rupture life of the weld metal because Ni, which is harmful to the high temperature creep strength, is contained in the wire in excess of the specified range of the present invention. Absent.
【0039】比較例であるワイヤNo:W12は、N含
有量が本発明の規定範囲より高めに外れているため、溶
接金属の十分な靭性が得られていない。In the wire No .: W12, which is a comparative example, the N content is out of the range specified in the present invention, so that sufficient toughness of the weld metal is not obtained.
【0040】比較例であるワイヤNo:W13は、O含
有量が本発明の規定範囲より高めに外れているため、溶
接金属の十分な靭性が得られていない。In the wire No: W13, which is a comparative example, the O content is out of the range specified in the present invention, so that sufficient toughness of the weld metal is not obtained.
【0041】比較例であるワイヤNo:W14は、Mo
含有量が本発明の規定範囲より低めに外れているため、
十分な室温強度及び高温クリープ強度が得られていな
い。The wire No: W14 of the comparative example is Mo
Because the content is lower than the specified range of the present invention,
Sufficient room-temperature strength and high-temperature creep strength have not been obtained.
【0042】一方、発明例であるワイヤNo:W1から
W6は、いずれも本発明の要件を満たしているため、室
温強度が758(MPa)以上、O℃でのシャルピー吸
収エネルギーが210(J)以上、温度550℃での1
00MPa付加時のクリープ破断時間が14500
(h)以上であり、予熱及び後熱処理がない条件での低
温割れの発生もなく、溶接金属の室温強度、靭性、50
0℃以上での高温クリープ強度に優れ、低温割れがない
良好な溶接金属を得ることができた。On the other hand, since the wire Nos. W1 to W6 of the invention examples all satisfy the requirements of the present invention, the room temperature strength is 758 (MPa) or more, and the Charpy absorption energy at O ° C. is 210 (J). As described above, 1 at a temperature of 550 ° C.
Creep rupture time at the time of adding 00 MPa is 14500
(H) or more, no low-temperature cracking occurs without preheating and post-heating, and the room temperature strength, toughness,
A good weld metal having excellent high-temperature creep strength at 0 ° C. or higher and no low-temperature cracking was obtained.
【0043】[0043]
【発明の効果】本発明の溶接材料は、従来の低Crフェ
ライト系耐熱鋼用溶接ワイヤと比較して低い合金コスト
で、室温強度、靭性、耐低温割れ性及び500℃以上で
の高温でのクリープ強度を著しく高めたものである。各
種発電ボイラ、化学圧力容器などに使用されるCrを
1.5%以下に含有する低Crフェライト系耐熱鋼を溶
接する場合に、本発明の溶接材料を使用することによ
り、溶接継手の信頼性を大幅に向上させることができ
る。EFFECTS OF THE INVENTION The welding material of the present invention has a lower alloy cost, room temperature strength, toughness, low-temperature cracking resistance, and a high temperature at 500 ° C. or higher than the conventional welding wire for low Cr ferritic heat resistant steel. The creep strength is significantly increased. When welding low Cr ferritic heat resistant steel containing 1.5% or less of Cr used for various power generation boilers, chemical pressure vessels, etc., the reliability of welded joints can be improved by using the welding material of the present invention. Can be greatly improved.
【図1】実施例に用いた溶接部の開先形状を示す断面図
である。FIG. 1 is a sectional view showing a groove shape of a welded portion used in an example.
【図2】実施例に用いた溶接部からの試験片採取位置を
示す断面図である。FIG. 2 is a cross-sectional view showing a position where a test piece is collected from a welded portion used in Examples.
1 室温引張試験片及びクリープ破断試験片採取位置 2 2mmVシャルピー衝撃試験片採取位置 1 Room temperature tensile test specimen and creep rupture test specimen collection position 2 2mmV Charpy impact test specimen collection position
Claims (1)
0.09%、Si:0.05〜0.3%、Mn:0.0
2〜0.9%、P:0.025%以下、S:0.015
%以下、Cr:0.8〜1.5%、Mo:0.4〜1.
2%、W:0.004〜1.5%、Ni:0.1%未
満、N:0.0005〜0.01%、O:0.008%
以下を含有し、さらに、V:0.1〜0.7%、Nb:
0.01〜0.1%、Ta:0.01〜0.1%の内の
1種もしくは2種以上を含有し、残部がFe及び不可避
的不純物からなり、溶接予熱及び後熱処理の省略が可能
であり、且つ高強度、高靭性、高クリープ強度である溶
接金属が得られることを特徴とする低Cr系高強度高靭
性耐熱鋼用溶接ワイヤ。1. C: 0.03 to 1% by mass (the same applies hereinafter)
0.09%, Si: 0.05 to 0.3%, Mn: 0.0
2 to 0.9%, P: 0.025% or less, S: 0.015
% Or less, Cr: 0.8 to 1.5%, Mo: 0.4 to 1.%.
2%, W: 0.004 to 1.5%, Ni: less than 0.1%, N: 0.0005 to 0.01%, O: 0.008%
It contains the following, and further, V: 0.1 to 0.7%, Nb:
One or two or more of 0.01 to 0.1% and Ta: 0.01 to 0.1% are contained, and the balance is composed of Fe and inevitable impurities. A welding wire for a low Cr-based high-strength high-toughness heat-resistant steel, which is capable of obtaining a weld metal having high strength, high toughness, and high creep strength.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000191164A JP2002001579A (en) | 2000-06-26 | 2000-06-26 | WELDING WIRE FOR LOW-Cr-CONTENT, HIGH-STRENGTH, HIGH- TOUGHNESS HEAT-RESISTING STEEL |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000191164A JP2002001579A (en) | 2000-06-26 | 2000-06-26 | WELDING WIRE FOR LOW-Cr-CONTENT, HIGH-STRENGTH, HIGH- TOUGHNESS HEAT-RESISTING STEEL |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2002001579A true JP2002001579A (en) | 2002-01-08 |
Family
ID=18690508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000191164A Withdrawn JP2002001579A (en) | 2000-06-26 | 2000-06-26 | WELDING WIRE FOR LOW-Cr-CONTENT, HIGH-STRENGTH, HIGH- TOUGHNESS HEAT-RESISTING STEEL |
Country Status (1)
Country | Link |
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JP (1) | JP2002001579A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107442967A (en) * | 2017-09-11 | 2017-12-08 | 成都新大洋焊接材料有限责任公司 | A kind of heat resisting steel argon arc welding wire and its manufacture method |
CN108500508A (en) * | 2018-03-16 | 2018-09-07 | 上海连山金属材料有限公司 | A kind of 770MPa grades of high-strength steel preheating-free gas protecting welding wire |
CN114273818A (en) * | 2022-01-24 | 2022-04-05 | 昆山京群焊材科技有限公司 | Submerged arc welding wire and welding flux for 1.25% Cr-0.5% Mo-V steel in coal chemical industry |
-
2000
- 2000-06-26 JP JP2000191164A patent/JP2002001579A/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107442967A (en) * | 2017-09-11 | 2017-12-08 | 成都新大洋焊接材料有限责任公司 | A kind of heat resisting steel argon arc welding wire and its manufacture method |
CN108500508A (en) * | 2018-03-16 | 2018-09-07 | 上海连山金属材料有限公司 | A kind of 770MPa grades of high-strength steel preheating-free gas protecting welding wire |
CN114273818A (en) * | 2022-01-24 | 2022-04-05 | 昆山京群焊材科技有限公司 | Submerged arc welding wire and welding flux for 1.25% Cr-0.5% Mo-V steel in coal chemical industry |
CN114273818B (en) * | 2022-01-24 | 2023-11-28 | 昆山京群焊材科技有限公司 | Submerged arc welding wire for 1.25% Cr-0.5% Mo-V steel in coal chemical industry and welding flux |
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