JPH04305396A - Low hydrogen type coated arc welding rod - Google Patents
Low hydrogen type coated arc welding rodInfo
- Publication number
- JPH04305396A JPH04305396A JP8933491A JP8933491A JPH04305396A JP H04305396 A JPH04305396 A JP H04305396A JP 8933491 A JP8933491 A JP 8933491A JP 8933491 A JP8933491 A JP 8933491A JP H04305396 A JPH04305396 A JP H04305396A
- Authority
- JP
- Japan
- Prior art keywords
- weight percent
- welding rod
- weight
- strength
- core wire
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 45
- 239000001257 hydrogen Substances 0.000 title claims abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 229910001512 metal fluoride Inorganic materials 0.000 claims abstract description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 239000003381 stabilizer Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 10
- 238000001556 precipitation Methods 0.000 abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 5
- 229910052759 nickel Inorganic materials 0.000 abstract description 5
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 229910052721 tungsten Inorganic materials 0.000 abstract description 4
- 229910052758 niobium Inorganic materials 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 20
- 238000005336 cracking Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 239000011324 bead Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910016036 BaF 2 Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、高強度フェライト系耐
熱鋼用溶接材料に関し、詳しくは高温におけるクリープ
特性に優れた低水素系被覆アーク溶接棒に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding material for high-strength ferritic heat-resistant steel, and more particularly to a low-hydrogen coated arc welding rod with excellent creep properties at high temperatures.
【０００２】0002
【従来の技術】最近ボイラーのような高温高圧で操業さ
れる機器の設計に際しては、圧力効率、熱効率を高める
ために操業時の温度及び圧力を可及的に高めようとする
動きがある。このようなボイラー等の用途に使用される
材料としては、耐酸化性、高温強度の面から鋼材は２と
４分の１Ｃｒ−１Ｍｏ鋼などの低合金鋼に替え、例えば
９Ｃｒ−２Ｍｏ鋼、９Ｃｒ−１Ｍｏ−Ｎｂ−Ｖ鋼、９Ｃ
ｒ−０．５Ｍｏ−１．８Ｗ−Ｎｂ−Ｖ鋼等のＣｒ−Ｍｏ
鋼が開発されている。2. Description of the Related Art Recently, when designing equipment such as boilers that operate at high temperatures and high pressures, there is a movement to increase the temperature and pressure during operation as much as possible in order to improve pressure efficiency and thermal efficiency. For materials used in such applications such as boilers, steel materials should be replaced with low alloy steels such as 1/4 Cr-1Mo steel, for example, 9Cr-2Mo steel, 9Cr -1Mo-Nb-V steel, 9C
Cr-Mo such as r-0.5Mo-1.8W-Nb-V steel
steel has been developed.
【０００３】一方このようなＣｒ−Ｍｏ鋼用の溶接材料
としては、例えば、特開昭５５−３０３５４号公報では
、多量のＮｉやＭｎ等のオーステナイト相安定化元素を
含有させ、溶接金属中の粗大フェライト相を減少させる
方法が提案されているが、過量のＮｉは長時間クリープ
破断強度を低下させ、また必要以上のＮｉやＭｎは溶接
金属の耐割れ性を低下させるので、目標とする高性能の
溶接継手を得ることはできない。On the other hand, as a welding material for such Cr-Mo steel, for example, Japanese Patent Application Laid-Open No. 55-30354 contains a large amount of austenite phase stabilizing elements such as Ni and Mn to stabilize the weld metal. Methods have been proposed to reduce the coarse ferrite phase, but excessive Ni reduces the long-term creep rupture strength, and excessive Ni and Mn reduce the cracking resistance of the weld metal, so it is difficult to achieve the target high It is not possible to obtain a high-performance welded joint.
【０００４】また、特開昭６２−２２０３００号公報で
は、９Ｃｒ系鋼の溶接において溶接棒中に適量のＷを添
加するとともにＷをＭｏ量との関係で限定共存させるこ
とにより、溶接金属に析出する炭化物の粗大化をＶ ４
Ｃ ３、ＮｂＣの析出で長時間にわたり抑制するととも
に、さらにＭｏ ２Ｃ、Ｗ ２Ｃの析出バランスを適正
な範囲に保つことによって高温長時間側のクリープ破断
強度を向上させている。しかしながら、さらにボイラの
熱効率を高めるために鋼材は高強度化へと指向しており
、前述の溶接棒によって得られる溶接部は母材に匹敵す
る継手性能を得ることができない。Furthermore, in JP-A No. 62-220300, in welding 9Cr steel, an appropriate amount of W is added to the welding rod, and W is allowed to coexist in a limited manner in relation to the amount of Mo, thereby preventing precipitation in the weld metal. The coarsening of carbides caused by V 4
In addition to suppressing the precipitation of C 3 and NbC over a long period of time, the creep rupture strength at high temperatures and long periods of time is improved by maintaining the precipitation balance of Mo 2C and W 2C within an appropriate range. However, in order to further increase the thermal efficiency of boilers, steel materials are becoming stronger, and the welded joint obtained by the above-mentioned welding rod cannot achieve joint performance comparable to that of the base metal.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は上記の
ような事情に着目し、高温強度や高温クリープ破断強度
、更には耐割れ性等を損なうことなく粗大フェライト相
を減少し、母材に匹敵する強度、靱性及び耐割れ性等を
確保することにある。[Problems to be Solved by the Invention] The purpose of the present invention is to reduce the coarse ferrite phase without impairing high temperature strength, high temperature creep rupture strength, cracking resistance, etc., and improve the strength of the base material. The aim is to ensure strength, toughness, cracking resistance, etc. comparable to that of
【０００６】[0006]
【課題を解決するための手段】本発明者等は上記目的を
達成するため鋭意研究を進めてきた。本発明は、こうし
た研究の結果完成されたものであって、それは金属炭酸
塩：３０から６０重量パーセント、金属弗化物１０から
３０重量パーセント、その他に上記以外のアーク安定剤
、スラグ生成剤、粘結剤を含む被覆剤を溶接棒全重量に
対して２２から４０重量パーセントとなるように鋼心線
外周に被覆してなる被覆アーク溶接棒において、前記被
覆剤と前記鋼心線中の両方または一方の成分調整により
溶接棒全重量に対してＣ：０．０１から０．１１重量パ
ーセント、Ｓｉ：０．３から１．３重量パーセント、Ｍ
ｎ：１．０から１．９重量パーセント、Ｃｒ：５．９か
ら９．５重量パーセント、Ｍｏ：０．３から０．６重量
パーセント、Ｎｉ：０．２から１．２重量パーセント、
Ｖ：０．１０から０．４０重量パーセント、Ｎｂ：０．
０２から０．１０重量パーセント、Ｗ：１．０から１．
９重量パーセント、Ｎ：０．０３から０．０７重量パー
セント含有せしめ、または、これらにさらにＡｌ：０．
５から１．５重量パーセント、Ｂ：０．０１から０．０
５重量パーセントの成分を含有せしめたところに要旨が
存在する。[Means for Solving the Problems] The present inventors have carried out intensive research in order to achieve the above object. The present invention was completed as a result of such research, and consists of metal carbonates: 30 to 60 weight percent, metal fluorides: 10 to 30 weight percent, arc stabilizers other than those mentioned above, slag forming agents, viscous A coated arc welding rod in which the outer periphery of the steel core wire is coated with a coating agent containing a binder in an amount of 22 to 40% by weight based on the total weight of the welding rod, wherein both the coating agent and the steel core wire or By adjusting one of the components, C: 0.01 to 0.11 weight percent, Si: 0.3 to 1.3 weight percent, M based on the total weight of the welding rod.
n: 1.0 to 1.9 weight percent, Cr: 5.9 to 9.5 weight percent, Mo: 0.3 to 0.6 weight percent, Ni: 0.2 to 1.2 weight percent,
V: 0.10 to 0.40 weight percent, Nb: 0.
02 to 0.10 weight percent, W: 1.0 to 1.
9 weight percent, N: 0.03 to 0.07 weight percent, or Al: 0.9 weight percent.
5 to 1.5 weight percent, B: 0.01 to 0.0
The gist lies in the inclusion of 5 weight percent of the ingredients.
【０００７】即ち本発明では、粗大フェライト相の析出
抑制効果を有するＣ，Ｓｉ，Ｃｒ，Ｍｏ，Ｖ，Ｎｂ及び
Ｗと、オーステナイト相安定化効果を有するＭｎ，Ｎｉ
，Ｎを溶接材料中にそれぞれ適量含有せしめ、粗大フェ
ライト相を微細化させることにより、高温強度及び高温
クリープ破断強度を母材並みに高めるとともに、靱性の
向上、溶接後熱処理（ＰＷＨＴ）に対する軟化抵抗の増
大及び優れた溶接作業性の確保等を一挙に達成すること
ができる。That is, in the present invention, C, Si, Cr, Mo, V, Nb and W, which have the effect of suppressing the precipitation of the coarse ferrite phase, and Mn, Ni, which have the effect of stabilizing the austenite phase, are used.
, N in appropriate amounts in the welding material to refine the coarse ferrite phase, it increases high temperature strength and high temperature creep rupture strength to the same level as the base metal, improves toughness, and resists softening against post-weld heat treatment (PWHT). It is possible to achieve an increase in the welding performance and ensure excellent welding workability all at once.
【０００８】なお、本発明に用いる心線はＣ，Ｓｉ，Ｍ
ｎ，Ｃｒ．Ｍｏ，Ｎｉ，Ｖ，Ｎｂ，Ｗ，Ｎ，Ａｌ，Ｂ以
外の化学成分がＰ：０．０２重量パーセント以下、Ｓ：
０．０２重量パーセント以下、Ｔｉ：０．０１重量パー
セント以下、Ｃｕ：０．１重量パーセント以下、Ｏ：０
．０５重量パーセント以下、残部がＦｅ及び不可避不純
物からなるものである。[0008] The core wires used in the present invention are C, Si, M
n, Cr. Chemical components other than Mo, Ni, V, Nb, W, N, Al, and B are P: 0.02% by weight or less, S:
0.02 weight percent or less, Ti: 0.01 weight percent or less, Cu: 0.1 weight percent or less, O: 0
．． 0.5% by weight or less, the remainder consisting of Fe and unavoidable impurities.
【０００９】[0009]
【作用】以下に本発明における成分組成限定の理由を詳
細に説明する。まず本発明において被覆剤中の金属炭酸
塩、金属弗化物の含有率及び被覆率を定めた理由は次の
通りである。
金属炭酸塩：３０から６０重量パーセント本発明でいう
金属炭酸塩とは、ＣａＣＯ ３，ＢａＣＯ ３，ＭｇＣ
Ｏ ３などを指すものであるが、これら金属炭酸塩はア
ーク中で分解しＣＯ ２ガスを発生し溶融メタルを大気
から遮断して、アーク雰囲気中の水素分圧を下げる効果
があり、塩基性のスラグを生成する。[Operation] The reasons for limiting the component composition in the present invention will be explained in detail below. First, the reasons for determining the content and coverage of metal carbonate and metal fluoride in the coating material in the present invention are as follows. Metal carbonate: 30 to 60% by weight Metal carbonate as used in the present invention refers to CaCO 3, BaCO 3, MgC
These metal carbonates decompose in the arc, generate CO2 gas, cut off the molten metal from the atmosphere, and have the effect of lowering the hydrogen partial pressure in the arc atmosphere. generates a slug of
【００１０】これら添加量が３０重量パーセント未満で
はスラグの融点が低下し、スラグの被包性が悪くなって
良好なビードを得ることができない。また、大気を遮断
するガス発生量が不足するため、ピットやブローホール
が発生する。一方６０重量パーセントを超えて添加した
場合は、溶融スラグの粘度が高くなりすぎ、スパッタが
増加すると共にビード外観も悪化する。[0010] If the amount added is less than 30% by weight, the melting point of the slag decreases, the encapsulation of the slag deteriorates, and good beads cannot be obtained. In addition, pits and blowholes occur because the amount of gas generated to block out the atmosphere is insufficient. On the other hand, if it is added in an amount exceeding 60% by weight, the viscosity of the molten slag becomes too high, spatter increases, and the bead appearance deteriorates.
【００１１】金属弗化物：１０から３０重量パーセント
本発明でいう金属弗化物とは、ＣａＦ ２，ＢａＦ ２
，ＭｇＦ ２，ＬｉＦなどを指すものであるが、いずれ
もスラグの融点を下げて流動性の良いスラグをつくる。
またアーク中で分解した弗素は溶融メタルや溶融スラグ
の水素と反応し、溶接金属の水素分圧を下げて耐割れ性
の良好な溶接金属をつくる。Metal fluoride: 10 to 30% by weight Metal fluoride as used in the present invention refers to CaF 2 , BaF 2
, MgF 2 , LiF, etc., all of which lower the melting point of slag and create slag with good fluidity. In addition, fluorine decomposed in the arc reacts with hydrogen in the molten metal and molten slag, lowering the hydrogen partial pressure in the weld metal and creating a weld metal with good crack resistance.
【００１２】これらの添加量が１０重量パーセント未満
では適当なスラグの流動性が得られず、ビード形成が悪
くピットが発生したりする。一方３０重量パーセントを
超えて添加した場合は、溶融スラグの粘性が不足し、ビ
ード形状が悪くなったり被覆筒が弱く溶接作業性が劣る
。[0012] If the amount added is less than 10% by weight, appropriate fluidity of the slag cannot be obtained, and bead formation is poor and pits may occur. On the other hand, if it is added in excess of 30% by weight, the viscosity of the molten slag will be insufficient, resulting in poor bead shape and weak coating tube, resulting in poor welding workability.
【００１３】被覆率：２２から４０重量パーセント被覆
率とは、溶接棒全重量に対する被覆剤の重量パーセント
を意味し、２２重量パーセント未満では保護筒としての
機能が不十分になってスパッタが増加したり、生成スラ
グ量の不足によってビード外観が悪化し、一方４０重量
パーセントを超えると、スラグ量が多くなりすぎるため
にスラグ巻き込み等の欠陥が発生し易くなると共に、開
先幅の狭い溶接継手に適用した場合に運棒が困難になる
。Coverage rate: 22 to 40 weight percent Coverage rate refers to the weight percent of the coating agent relative to the total weight of the welding rod; if it is less than 22 weight percent, the function as a protective tube will be insufficient and spatter will increase. However, if the amount exceeds 40% by weight, the amount of slag becomes too large and defects such as slag entrainment are likely to occur. If applied, it will become difficult to move the stick.
【００１４】次に被覆剤及び鋼心線のいずれかまたは両
方に含有させる必須元素について詳述する。
Ｃ：０．０１から０．１１重量パーセントＣは溶接金属
中に歩留まって炭化物の析出による強度が向上し、かつ
粗大フェライトの生成を抑制する効果があり、溶接棒中
に少なくとも０．０１重量パーセント以上含有させなけ
ればならない。しかし多すぎると溶接割れ感受性が劣化
するので、０．１１重量パーセント以下に抑えなければ
ならない。Next, the essential elements to be contained in either or both of the coating material and the steel core wire will be explained in detail. C: 0.01 to 0.11 weight percent C remains in the weld metal and improves the strength due to the precipitation of carbides, and has the effect of suppressing the formation of coarse ferrite. Must contain at least %. However, if it is too large, the weld cracking susceptibility deteriorates, so it must be kept at 0.11% by weight or less.
【００１５】Ｓｉ：０．３から１．３重量パーセント溶
接金属の脱酸を目的とするものであるが、溶接作業性確
保の上からも必要である。溶接棒中の含有率が０．３重
量パーセント未満では、脱酸不足によって溶接金属中に
気孔が発生しやくすく、一方１．３重量パーセントを超
えると、溶接金属の靱性が低下する。Si: 0.3 to 1.3 weight percent Although the purpose is to deoxidize the weld metal, it is also necessary to ensure welding workability. When the content in the welding rod is less than 0.3% by weight, pores are likely to be generated in the weld metal due to insufficient deoxidation, while when it exceeds 1.3% by weight, the toughness of the weld metal decreases.
【００１６】Ｍｎ：１．０から１．９重量パーセントＳ
ｉと同様に脱酸剤として重要であり、少なくとも１．０
重量パーセント含有させなければならないが、１．９重
量パーセントを超えると溶接金属の微細フェライトがな
くなって焼入れ硬化性が過大となり、溶接割れ感受性が
劣化する。Mn: 1.0 to 1.9 weight percent S
Like i, it is important as a deoxidizer, and at least 1.0
It must be contained in a weight percent, but if it exceeds 1.9 weight percent, fine ferrite in the weld metal disappears, resulting in excessive quench hardenability and deterioration of weld cracking susceptibility.
【００１７】Ｃｒ：５．９から９．５重量パーセント母
材共金系として、同等量添加し溶接金属の耐酸化性、耐
蝕性及び高温強度を高めるのに不可欠の元素で、この種
の成分系における主成分であり、少なくとも５．９重量
パーセント含有させなければならない。一方、９．５重
量パーセントを超えると、粗大フェライトが生成して靱
性が低下する。[0017] Cr: 5.9 to 9.5% by weight An essential element for increasing the oxidation resistance, corrosion resistance, and high-temperature strength of the weld metal when added in equal amounts as a co-metal system for the base metal. It is the main component in the system and must contain at least 5.9 weight percent. On the other hand, if it exceeds 9.5 weight percent, coarse ferrite will be produced and the toughness will decrease.
【００１８】Ｍｏ：０．３から０．６重量パーセントＣ
ｒと同様に共金系として、同等量の添加が必要であり、
固溶体効果によりクリープ破断強度が向上する効果があ
り、少なくとも０．３重量パーセント以上含有させなけ
ればならない。一方、０．６重量パーセントを超えても
クリープ破断強度向上効果は得られず、かえって溶接性
の著しい劣化を招くので上限を０．６重量パーセントと
した。Mo: 0.3 to 0.6 weight percent C
Similar to r, it is necessary to add the same amount as a cometal system,
It has the effect of improving creep rupture strength due to the solid solution effect, and must be contained in an amount of at least 0.3% by weight. On the other hand, if the content exceeds 0.6 weight percent, no effect of improving creep rupture strength can be obtained, and on the contrary, it causes a significant deterioration of weldability, so the upper limit was set at 0.6 weight percent.
【００１９】Ｎｉ：０．２から１．２重量パーセントＮ
ｉは粗大フェライトの生成を抑制し、溶接金属の靱性の
安定化に有効であり、０．２重量パーセント未満ではそ
の効果が得られない。一方１．２重量パーセントを超え
ると、高温強度及びクリープ破断強度が著しく低下する
。Ni: 0.2 to 1.2 weight percent N
i is effective in suppressing the formation of coarse ferrite and stabilizing the toughness of the weld metal, and if it is less than 0.2 weight percent, this effect cannot be obtained. On the other hand, if it exceeds 1.2 weight percent, the high temperature strength and creep rupture strength will be significantly reduced.
【００２０】Ｖ：０．１０から０．４０重量パーセント
Ｖは高温強度を著しく高める元素であり、Ｖ ４Ｃ ３
としての他Ｍ２３Ｃ ６，Ｍ ６Ｃ（Ｍは金属元素を示
す）の一部に入り、析出物の粗大化の抑制に優れた効果
を発揮するが、０．１０重量パーセント未満ではその効
果が得られない。一方、０．４０重量パーセントを超え
ると、炭化物が過剰に析出して靱性が低下する。V: 0.10 to 0.40% by weight V is an element that significantly increases high temperature strength, and V 4C 3
In addition to M23C6, M23C (M represents a metal element) is present in some parts and exhibits an excellent effect in suppressing coarsening of precipitates, but this effect cannot be obtained at less than 0.10% by weight. do not have. On the other hand, if it exceeds 0.40 weight percent, carbides will precipitate excessively and the toughness will decrease.
【００２１】Ｎｂ：０．０２から０．１０重量パーセン
ト
ＮｂはＮｂＣの析出によって高温強度を高め、Ｍ２３Ｃ
６，Ｍ ６Ｃ等の析出状態をコントロールするために
クリープ破断強度改善に効果がある。しかしその量が０
．０２重量パーセント未満ではその効果がなく、０．１
０重量パーセントを超えると炭化物が凝集粗大化して強
度を低下させる。Nb: 0.02 to 0.10% by weight Nb increases high temperature strength by precipitation of NbC and improves M23C
It is effective in improving creep rupture strength because it controls the precipitation state of 6, M 6C, etc. However, the amount is 0
．． Less than 0.02 weight percent has no effect, and 0.1
If it exceeds 0 weight percent, the carbides will aggregate and become coarse, reducing the strength.
【００２２】Ｗ：１．０から１．９重量パーセントＷは
Ｃｒ，Ｍｏと同族の元素であり、焼戻しによってＷ ２
Ｃが析出し、特にＭｏとの共存においては高温長時間側
でのクリープ破断強度向上への効果は極めて大きい。
しかしながら１．０重量パーセント未満ではＭｏとの共
存効果が得られず高温強度改善が達成できない。一方１
．９重量パーセントを超えると溶接金属の延性が低下す
ると同時に溶接作業性が劣化してくるので１．９重量パ
ーセントを上限とした。W: 1.0 to 1.9 weight percent W is an element in the same group as Cr and Mo, and by tempering, W 2
C precipitates, especially when coexisting with Mo, has an extremely large effect on improving creep rupture strength at high temperatures and long periods of time. However, if it is less than 1.0 weight percent, no effect of coexistence with Mo can be obtained and no improvement in high-temperature strength can be achieved. On the other hand 1
．． If it exceeds 9 weight percent, the ductility of the weld metal will decrease and welding workability will deteriorate at the same time, so 1.9 weight percent is set as the upper limit.
【００２３】Ｎ：０．０３から０．０７重量パーセント
Ｎはオーステナイト安定化元素の１つであり、微細な炭
窒化物を析出させることにより高温強度、クリープ破断
強度及び靱性を向上させる。しかしながら０．０３重量
パーセント未満ではその効果がなく、一方０．０７重量
パーセントを超えると、溶接金属の凝固時に非固溶窒素
がブローホール等の気孔欠陥として発生しやすくなる。N: 0.03 to 0.07 weight percent N is one of the austenite stabilizing elements and improves high temperature strength, creep rupture strength and toughness by precipitating fine carbonitrides. However, if it is less than 0.03 weight percent, there is no effect, while if it exceeds 0.07 weight percent, non-dissolved nitrogen tends to occur as pore defects such as blowholes during solidification of the weld metal.
【００２４】本発明溶接棒に含まれる元素の種類及び最
適含有率は上記の通りであり、上記の要件を満足する限
り本発明の目的は達成されるが、各元素の機能を総合的
に考慮し、溶接金属の高温強度、高温クリープ破断強度
、靱性、耐割れ性等を一層効果的に高めるためには、下
記の元素をも添加してもよい。The types and optimum content of elements contained in the welding rod of the present invention are as described above, and as long as the above requirements are satisfied, the purpose of the present invention is achieved, but the function of each element must be comprehensively considered. However, in order to more effectively increase the high temperature strength, high temperature creep rupture strength, toughness, cracking resistance, etc. of the weld metal, the following elements may also be added.
【００２５】Ａｌ：０．５から１．５重量パーセントＡ
ｌは溶接金属中の酸素量を低減し、微細炭化物の析出促
進によるＣの固定により溶接金属の耐割れ性を向上させ
るのに有効であるが、０．５重量パーセント未満ではそ
の効果が不十分である。一方１．５重量パーセントを超
えるとアークが不安定でありスパッタ量が増加して溶接
作業性が劣化する。Al: 0.5 to 1.5 weight percent A
L is effective in reducing the amount of oxygen in the weld metal and improving the cracking resistance of the weld metal by fixing C by promoting the precipitation of fine carbides, but if it is less than 0.5 weight percent, the effect is insufficient. It is. On the other hand, if it exceeds 1.5 weight percent, the arc becomes unstable, the amount of spatter increases, and welding workability deteriorates.
【００２６】Ｂ：０．０１から０．０５重量パーセント
ＢはＭｏ，Ｗの添加効果を相剰的に高める作用を有する
が、０．０１重量パーセント未満ではその効果が有効に
発揮されない。一方０．０５重量パーセントを超えると
溶接金属の靱性が低下すると共に溶接作業性も低下する
。B: 0.01 to 0.05 weight percent B has the effect of mutually increasing the effect of adding Mo and W, but if it is less than 0.01 weight percent, the effect is not effectively exhibited. On the other hand, if it exceeds 0.05 weight percent, the toughness of the weld metal will decrease and welding workability will also decrease.
【００２７】本発明の被覆アーク溶接棒は、前述の成分
の他にアーク安定剤、スラグ生成剤として被覆剤中に鉄
粉、アルカリ成分、ルチル等を添加するが、その添加範
囲は２５重量パーセント以下が望ましい。さらに粘結剤
としては、主に硅酸ソーダ、硅酸カリを含有する水ガラ
スを用いるものであり、水ガラス中のＳｉＯ ２とＮａ
２Ｏ，Ｋ ２Ｏ等のアルカリ成分のモル比が、１．５
から３．５の範囲を使用することが望ましい。本発明の
被覆アーク溶接棒は、通常の溶接棒塗装機により被覆塗
装した後、水分を除去するために３００から５５０度Ｃ
で焼成して製造する。In the coated arc welding rod of the present invention, in addition to the above-mentioned components, iron powder, an alkali component, rutile, etc. are added to the coating material as an arc stabilizer and a slag forming agent, but the addition range is 25% by weight. The following are desirable. Furthermore, as a binder, water glass containing mainly sodium silicate and potassium silicate is used, and SiO 2 and Na in the water glass are used as a binder.
The molar ratio of alkaline components such as 2O and K2O is 1.5
It is desirable to use a range from 3.5 to 3.5. The coated arc welding rod of the present invention is coated at a temperature of 300 to 550 degrees Celsius to remove moisture after being coated with a conventional welding rod coating machine.
Manufactured by firing.
【００２８】[0028]
【実施例】以下に実施例により本発明の効果を更に具体
的に示す。Ｃｒ−Ｍｏ鋼心線（３．２ｍｍ径）の外周に
被覆率２７から２９重量パーセントとなる様に被覆剤を
塗布し、表１に示す成分組成の被覆アーク溶接棒を製造
した。得られた各溶接棒を用い、９Ｃｒ−０．５Ｍｏ−
１．８Ｗ−Ｎｂ−Ｖ鋼板を母材としてＡＷＳ Ａ５．
４に基づき溶接実験を行ない表２の結果を得た。なお溶
接条件は、溶接電流１２０アンペア、溶接入熱１４ｋＪ
／ｃｍ、予熱パス環温度２００から２２０度Ｃ、下向き
姿勢で溶接継手を作製した。さらに溶接終了後７５０度
Ｃで４時間歪取り焼鈍を行った後、各種物性試験を行っ
た。[Examples] The effects of the present invention will be illustrated in more detail with the following examples. A coating agent was applied to the outer periphery of a Cr-Mo steel core wire (3.2 mm diameter) at a coverage of 27 to 29 weight percent to produce a coated arc welding rod having the composition shown in Table 1. Using each of the obtained welding rods, 9Cr-0.5Mo-
AWS A5. using 1.8W-Nb-V steel plate as the base material.
A welding experiment was conducted based on 4, and the results shown in Table 2 were obtained. The welding conditions are: welding current 120 amperes, welding heat input 14kJ.
/cm, a preheating pass ring temperature of 200 to 220 degrees Celsius, and a welded joint was produced in a downward position. Furthermore, after completing the welding, strain relief annealing was performed at 750 degrees Celsius for 4 hours, and various physical property tests were conducted.
【表１】[Table 1]
【表２】[Table 2]
【００２９】表１、表２からも明らかな様に、本発明の
要件を満たす溶接棒Ｎｏ．１からＮｏ．８を用いて得た
溶接部は、室温強度、高温強度、シャルピー吸収エネル
ギー及び高温クリープ破断強度の何れにおいても、比較
棒に比べて卓越した性能を有している。これに対し比較
例の溶接棒Ｎｏ．９はＮｉ量が多すぎるため、クリープ
破断強度が低い。Ｎｏ．１０は、Ｂ量が多すぎるため、
靱性が低い。Ｎｏ．１１はＶ量が少ないため、粗大フェ
ライトが析出し高温強度が低い。Ｎｏ．１２は、Ｗ量が
少ないため、クリープ破断強度が低い。Ｎｏ．１３は、
Ｎ量が少ないため、高温強度、クリープ破断強度が低い
。Ｎｏ．１４は、Ｓｉ量が多すぎるため、溶接金属の靱
性が低い。As is clear from Tables 1 and 2, welding rod No. 1 satisfies the requirements of the present invention. 1 to No. The welded joint obtained using No. 8 has excellent performance compared to the comparison rod in all of room temperature strength, high temperature strength, Charpy absorbed energy, and high temperature creep rupture strength. In contrast, the comparative example welding rod No. No. 9 has too much Ni content, so the creep rupture strength is low. No. 10 is because the amount of B is too large,
Low toughness. No. In No. 11, since the amount of V is small, coarse ferrite precipitates and the high temperature strength is low. No. No. 12 has a low creep rupture strength because the amount of W is small. No. 13 is
Since the amount of N is small, high temperature strength and creep rupture strength are low. No. No. 14 has too much Si, so the weld metal has low toughness.
【００３０】[0030]
【発明の効果】本発明は以上の様に構成されており、被
覆剤及び心線中に含有させる合金元素の種類及び含有率
を特定することによって、９Ｃｒ系母材に匹敵する物性
を有する溶接金属を得ることができ、この種の特殊鋼を
母材とする高温高圧反応設備等の品質を大幅に高め得る
。[Effects of the Invention] The present invention is constructed as described above, and by specifying the type and content of alloying elements contained in the coating material and the core wire, welding material having physical properties comparable to those of the 9Cr base material can be obtained. Metals can be obtained, and the quality of high-temperature, high-pressure reaction equipment, etc. that uses this type of special steel as a base material can be greatly improved.
Claims (2)
ト、金属弗化物１０から３０重量パーセント、その他に
上記以外のアーク安定剤、スラグ生成剤、粘結剤を含む
被覆剤を溶接棒全重量に対して２２から４０重量パーセ
ントとなるように鋼心線外周に被覆してなる被覆アーク
溶接棒において、前記被覆剤と前記鋼心線中の両方また
は一方の成分調整により溶接棒全重量に対してＣ：０．
０１から０．１１重量パーセント、Ｓｉ：０．３から１
．３重量パーセント、Ｍｎ：１．０から１．９重量パー
セント、Ｃｒ：５．９から９．５重量パーセント、Ｍｏ
：０．３から０．６重量パーセント、Ｎｉ：０．２から
１．２重量パーセント、Ｖ：０．１０から０．４０重量
パーセント、Ｎｂ：０．０２から０．１０重量パーセン
ト、Ｗ：１．０から１．９重量パーセント、Ｎ：０．０
３から０．０７重量パーセントの成分を含有せしめたこ
とを特徴とする低水素系被覆アーク溶接棒。Claim 1: A coating agent containing 30 to 60 weight percent of metal carbonate, 10 to 30 weight percent of metal fluoride, and other arc stabilizers, slag forming agents, and binders based on the total weight of the welding rod. In a coated arc welding rod in which the outer periphery of a steel core wire is coated with a carbon content of 22 to 40% by weight, the amount of C based on the total weight of the welding rod is adjusted by adjusting the composition of both or one of the coating material and the steel core wire. :0.
01 to 0.11 weight percent, Si: 0.3 to 1
．． 3 weight percent, Mn: 1.0 to 1.9 weight percent, Cr: 5.9 to 9.5 weight percent, Mo
: 0.3 to 0.6 weight percent, Ni: 0.2 to 1.2 weight percent, V: 0.10 to 0.40 weight percent, Nb: 0.02 to 0.10 weight percent, W: 1 .0 to 1.9 weight percent, N: 0.0
A low hydrogen-based coated arc welding rod characterized by containing a component of 3 to 0.07 weight percent.
ト、金属弗化物１０から３０重量パーセント、その他に
上記以外のアーク安定剤、スラグ生成剤、粘結剤を含む
被覆剤を溶接棒全重量に対して２２から４０重量パーセ
ントとなるように鋼心線外周に被覆してなる被覆アーク
溶接棒において、前記被覆剤と前記鋼心線中の両方また
は一方の成分調整により溶接棒全重量に対してＣ：０．
０１から０．１１重量パーセント、Ｓｉ：０．３から１
．３重量パーセント、Ｍｎ：１．０から１．９重量パー
セント、Ｃｒ：５．９から９．５重量パーセント、Ｍｏ
：０．３から０．６重量パーセント、Ｎｉ：０．２から
１．２重量パーセント、Ｖ：０．１０から０．４０重量
パーセント、Ｎｂ：０．０２から０．１０重量パーセン
ト、Ｗ：１．０から１．９重量パーセント、Ｎ：０．０
３から０．０７重量パーセント、Ａｌ：０．５から１．
５重量パーセント、Ｂ：０．０１から０．０５重量パー
セントの成分を含有せしめたことを特徴とする低水素系
被覆アーク溶接棒。2. A coating agent containing 30 to 60 weight percent of metal carbonate, 10 to 30 weight percent of metal fluoride, and other arc stabilizers, slag forming agents, and binders based on the total weight of the welding rod. In a coated arc welding rod in which the outer periphery of a steel core wire is coated with a carbon content of 22 to 40% by weight, the amount of C based on the total weight of the welding rod is adjusted by adjusting the composition of both or one of the coating material and the steel core wire. :0.
01 to 0.11 weight percent, Si: 0.3 to 1
．． 3 weight percent, Mn: 1.0 to 1.9 weight percent, Cr: 5.9 to 9.5 weight percent, Mo
: 0.3 to 0.6 weight percent, Ni: 0.2 to 1.2 weight percent, V: 0.10 to 0.40 weight percent, Nb: 0.02 to 0.10 weight percent, W: 1 .0 to 1.9 weight percent, N: 0.0
3 to 0.07 weight percent, Al: 0.5 to 1.
A low hydrogen-based coated arc welding rod, characterized in that it contains a component of 5% by weight and B: 0.01 to 0.05% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3089334A JPH0825060B2 (en) | 1991-03-29 | 1991-03-29 | Low-hydrogen coated arc welding rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3089334A JPH0825060B2 (en) | 1991-03-29 | 1991-03-29 | Low-hydrogen coated arc welding rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04305396A true JPH04305396A (en) | 1992-10-28 |
| JPH0825060B2 JPH0825060B2 (en) | 1996-03-13 |
Family
ID=13967792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3089334A Expired - Lifetime JPH0825060B2 (en) | 1991-03-29 | 1991-03-29 | Low-hydrogen coated arc welding rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0825060B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09122972A (en) * | 1995-10-30 | 1997-05-13 | Nippon Steel Corp | Coated electrode for high-cr ferrite heat resisting steel |
| JPH11170087A (en) * | 1997-12-05 | 1999-06-29 | Kobe Steel Ltd | Low hydrogen coated electrode for high cr ferritic heat resisting steel |
| JP2016120519A (en) * | 2014-12-25 | 2016-07-07 | 株式会社神戸製鋼所 | Low-hydrogen coated electrode |
| JP2018176283A (en) * | 2018-07-12 | 2018-11-15 | 株式会社神戸製鋼所 | Low-hydrogen coated electrode |
| CN109623200A (en) * | 2019-01-18 | 2019-04-16 | 江苏联捷焊业科技有限公司 | A kind of strand type submerged arc flux-cored wire and preparation method thereof having both high efficiency and crack resistance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61266199A (en) * | 1985-05-17 | 1986-11-25 | Kobe Steel Ltd | Coated electrode for welding cr-mo steel |
| JPS62220300A (en) * | 1986-03-20 | 1987-09-28 | Nippon Steel Corp | Low hydrogen type coated arc electrode |
-
1991
- 1991-03-29 JP JP3089334A patent/JPH0825060B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61266199A (en) * | 1985-05-17 | 1986-11-25 | Kobe Steel Ltd | Coated electrode for welding cr-mo steel |
| JPS62220300A (en) * | 1986-03-20 | 1987-09-28 | Nippon Steel Corp | Low hydrogen type coated arc electrode |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09122972A (en) * | 1995-10-30 | 1997-05-13 | Nippon Steel Corp | Coated electrode for high-cr ferrite heat resisting steel |
| JPH11170087A (en) * | 1997-12-05 | 1999-06-29 | Kobe Steel Ltd | Low hydrogen coated electrode for high cr ferritic heat resisting steel |
| JP2016120519A (en) * | 2014-12-25 | 2016-07-07 | 株式会社神戸製鋼所 | Low-hydrogen coated electrode |
| JP2018176283A (en) * | 2018-07-12 | 2018-11-15 | 株式会社神戸製鋼所 | Low-hydrogen coated electrode |
| CN109623200A (en) * | 2019-01-18 | 2019-04-16 | 江苏联捷焊业科技有限公司 | A kind of strand type submerged arc flux-cored wire and preparation method thereof having both high efficiency and crack resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0825060B2 (en) | 1996-03-13 |
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