JPH05104282A - Welding material for high-si content stainless steel - Google Patents
Welding material for high-si content stainless steelInfo
- Publication number
- JPH05104282A JPH05104282A JP26189191A JP26189191A JPH05104282A JP H05104282 A JPH05104282 A JP H05104282A JP 26189191 A JP26189191 A JP 26189191A JP 26189191 A JP26189191 A JP 26189191A JP H05104282 A JPH05104282 A JP H05104282A
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- welding
- stainless steel
- welding material
- corrosion resistance
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、硫酸プラントや硝酸プ
ラントにおいて、高温、高濃度の環境下で稼動する吸収
塔、冷却塔、ポンプ、タンク等に適用する高Ｓｉ含有ス
テンレス鋼の溶接材料に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding material for a high Si content stainless steel, which is applied to an absorption tower, a cooling tower, a pump, a tank, etc. operating under a high temperature and high concentration environment in a sulfuric acid plant or a nitric acid plant. ..
【０００２】[0002]
【従来の技術】従来、Ｓｉを１〜４％含有するステンレ
ス鋼は、耐酸化性等に優れ、多方面で利用されている。
その溶接には、ＴＩＧ溶接、ＭＩＧ溶接等が用いられ、
その溶接材料は共金系が多い。一方、Ｓｉを５〜７％含
有するステンレス鋼は、高温、高濃度硫酸（９７〜１０
０％）、高温、高濃度硝酸等の過酷な環境で、耐食性が
要求されるような特殊な用途で使用されている。その溶
接には、ＴＩＧ溶接が用いられ、その溶接材料も共金系
が使用されている。2. Description of the Related Art Conventionally, stainless steel containing 1 to 4% of Si has been used in various fields because of its excellent resistance to oxidation.
TIG welding, MIG welding, etc. are used for the welding,
Most of the welding materials are metal alloys. On the other hand, stainless steel containing 5 to 7% of Si has high temperature and high concentration of sulfuric acid (97 to 10).
0%), high temperature, high-concentration nitric acid, etc. are used for special applications requiring corrosion resistance in harsh environments. TIG welding is used for the welding, and the welding material is also a common metal system.
【０００３】[0003]
【発明が解決しようとする課題】Ｓｉを５〜７％含有す
るステンレス鋼（大部分はオーステナイト系ステンレス
鋼である）の溶接において、特にＳｉ含有量が６％以上
のステンレス鋼の溶接部はその硬度が著しく上昇して延
性は低下する。このため溶接部の曲げ試験（ＪＩＳ規
格）において溶接したままでは合格しない。これは溶着
金属部の硬度が上昇し、延性が乏しいことに起因してい
る。このような溶着金属部の硬化についてはＳｉ含有量
が５％程度においてもみられるが、前者ほど著しくはな
く、許容できる程度のものであり、曲げ試験にも合格す
る。In the welding of stainless steel containing 5 to 7% Si (most of which is austenitic stainless steel), the welded portion of stainless steel containing 6% or more of Si is The hardness significantly increases and the ductility decreases. Therefore, in the bending test (JIS standard) of the welded portion, it does not pass as welded. This is because the hardness of the deposited metal part increases and the ductility is poor. Such hardening of the deposited metal part is observed even when the Si content is about 5%, but it is not as remarkable as the former and is acceptable, and the bending test is also passed.
【０００４】しかし、高温、高濃度硫酸用プラント等に
使用される高Ｓｉステンレス鋼は、耐食性の観点からＳ
ｉを６％以上含有するものを使用する場合が多いが、上
記のようにＳｉ含有量が６％以上の溶接部は延性がかな
り低下し、曲げ試験に合格せず、大型溶接構造物の作製
は現実的に困難であった。従って、Ｓｉ含有量が６％以
上のステンレス鋼の溶接部で延性が要求される場合は、
溶接部を溶体化処理して対応せざるを得ない。しかし、
溶体化処理には大型設備を必要とし、処理経費も相当に
必要になるところから、実際に適用することは困難であ
った。本発明は、上記の問題点を解消し、溶体化処理を
必要とせずに、通常のＴＩＧ溶接で溶接して十分な延性
と耐食性を得ることができるＳｉ含有量５〜７％のオー
ステナイト系ステンレス鋼用の溶接材料を提供しようと
するものである。However, from the viewpoint of corrosion resistance, the high Si stainless steel used in high temperature and high concentration sulfuric acid plants etc.
In many cases, a material containing i of 6% or more is used, but as described above, a welded portion having a Si content of 6% or more has a considerably reduced ductility, fails to pass a bending test, and is a large welded structure. Was realistically difficult. Therefore, when ductility is required in a welded portion of stainless steel having a Si content of 6% or more,
There is no choice but to handle the welded parts by solution heat treatment. But,
Since the solution treatment requires a large-scale facility and requires a considerable treatment cost, it was difficult to actually apply it. The present invention solves the above-mentioned problems, and austenitic stainless steel having a Si content of 5 to 7% that can be welded by ordinary TIG welding to obtain sufficient ductility and corrosion resistance without requiring solution treatment. It is intended to provide a welding material for steel.
【０００５】[0005]
【課題を解決するための手段】本発明は、重量％でＣが
０．０４％以下、Ｓｉが４〜６％、Ｍｎが１〜５％、Ｃ
ｒが１５〜２５％、Ｎｉが４〜２５％、Ｐｄが０．０１
〜１．０７％、残部が実質的にＦｅからなることを特徴
とするＳｉを５〜７％含有するオーステナイト系ステン
レス鋼用の溶接材料である。According to the present invention, C is 0.04% or less by weight%, Si is 4 to 6%, Mn is 1 to 5%, and C is
r is 15 to 25%, Ni is 4 to 25%, and Pd is 0.01.
It is a welding material for austenitic stainless steel containing Si of 5 to 7%, characterized in that it is made up to 1.07% and the balance substantially consists of Fe.
【０００６】本発明の溶接材料のＳｉ含有量は、母材の
ステンレス鋼のＳｉ含有量が６％より低い場合、基本的
には母材と同量とするか、溶着金属部分の延性を向上さ
せるために母材のＳｉ含有量より低めに設定する。ま
た、Ｐｄ以外の成分も概略同様とする。The Si content of the welding material of the present invention is basically the same as that of the base metal when the Si content of the stainless steel of the base metal is lower than 6%, or the ductility of the welded metal portion is improved. Therefore, the content is set lower than the Si content of the base material. In addition, the components other than Pd are roughly the same.
【０００７】母材のＳｉ含有量が６％を越える場合は、
溶接材料のＰｄ含有量をＰｄ（％）≧（１／Ｋ）｛母材
のＳｉ（％）−溶接材料のＳｉ（％）｝（但し、Ｋは４
〜８）の式を満たすように含有させる。なお、Ｐｄ以外
の成分は母材と概略同量とする。この場合は、溶接材料
のＳｉ含有量が６％より低いため、溶着金属部で十分な
延性を得ることができるが、母材よりＳｉ含有量が低い
ために耐食性が低下する。これは、高温、高濃度硫酸中
の高Ｓｉオーステナイト系ステンレス鋼の耐食性がＳｉ
含有量にほぼ支配されるためである。そこで、適量のＰ
ｄを添加することにより（図２参照）、耐食性を向上さ
せることができるのである。なお、Ｐｄは金属組織的に
硬化を促進する作用を有しない。When the Si content of the base material exceeds 6%,
The Pd content of the welding material is Pd (%) ≧ (1 / K) {Si (%) of base material−Si (%) of welding material} (where K is 4
To 8) are included so as to satisfy the formula. The components other than Pd are approximately the same amount as the base material. In this case, since the Si content of the welding material is lower than 6%, sufficient ductility can be obtained in the deposited metal portion, but the Si content is lower than that of the base metal, so that the corrosion resistance is deteriorated. This is because the corrosion resistance of high Si austenitic stainless steel in high temperature and high concentration sulfuric acid is Si.
This is because it is almost controlled by the content. Therefore, an appropriate amount of P
The corrosion resistance can be improved by adding d (see FIG. 2). Note that Pd does not have a metallographically promoting action on hardening.
【０００８】上式のＫは、次のように求めた。即ち、Ｎ
ｉ：１７．５％，Ｃｒ：１７．５％残部Ｆｅ系の溶接材
料でＳｉ添加量を５〜８．５％の範囲で変化させたもの
を使用し、母材を共金としてＴＩＧ溶接を行い、１８０
℃並びに２２０℃の９８％の硫酸溶液中に２４時間浸漬
して試験片の重量減を測定して腐食速度（ｇｍ-2ｈ-1）
を算出し、図１に示した。図から明らかなように、Ｓｉ
含有量が増加すると腐食速度が低下し、耐食性が向上す
ることが分かる。Ｓｉ添加量に対する腐食速度の減少率
Ｋ1 は次式で示すことができ、 Ｋ1 ＝−（腐食速度）／（Ｓｉ添加量） 図１のデータから好ましいＫ1 の範囲を求めると、Ｋ1
≒０．０４（２２０℃）〜０．１３（１８０℃）であっ
た。次いで、Ｎｉ：１７．５％，Ｃｒ：１７．５％，Ｓ
ｉ：５．５％残部Ｆｅ系の溶接材料でＰｄ添加量を０〜
１％の範囲で変化させたものを使用し、母材はＰｄを除
いて共金としてＴＩＧ溶接を行い、１８０℃並びに２２
０℃の９８％の硫酸溶液中に２４時間浸漬して試験片の
重量減を測定して腐食速度（ｇｍ-2ｈ-1）を算出し、図
２に示した。図から明らかなように、Ｐｄ含有量が増加
すると腐食速度が低下し、耐食性が向上することが分か
る。Ｐｄ添加量に対する腐食速度の減少率Ｋ2 は次式で
示すことができ、 Ｋ2 ＝−（腐食速度）／（Ｐｄ添加量） 図２のデータから好ましいＫ2 の範囲を求めると、Ｋ2
≒０．３２（２２０℃）〜０．５２（１８０℃）であっ
た。そして、Ｋ1 とＫ2 の比としてＫ（＝Ｋ1 ／Ｋ2 ）
の範囲を算出すると、Ｋ＝４（１８０℃）〜８（２２０
℃）であった。K in the above equation was obtained as follows. That is, N
i: 17.5%, Cr: 17.5% Residual Fe-based welding material with Si added in a range of 5 to 8.5% is used, and TIG welding is performed with the base metal as common metal. Done, 180
Corrosion rate (gm -2 h -1 ) by immersing in 98% sulfuric acid solution at ℃ and 220 ℃ for 24 hours and measuring the weight loss of the test piece
Was calculated and shown in FIG. As is clear from the figure, Si
It can be seen that as the content increases, the corrosion rate decreases and the corrosion resistance improves. Reduction rate K 1 of the corrosion rates for Si addition amount can be represented by the following equation, K 1 = - when determining the range of (corrosion rate) / (Si amount) preferably K 1 from the data of FIG. 1, K 1
≈0.04 (220 ° C) to 0.13 (180 ° C). Next, Ni: 17.5%, Cr: 17.5%, S
i: 5.5% balance Fe-based welding material with Pd addition amount of 0
Using the one changed in the range of 1%, the base metal is TIG welded as common metal excluding Pd, 180 ° C and 22
The corrosion rate (gm -2 h -1 ) was calculated by immersing in a 98% sulfuric acid solution at 0 ° C for 24 hours, measuring the weight loss of the test piece, and shown in Fig. 2. As is clear from the figure, as the Pd content increases, the corrosion rate decreases and the corrosion resistance improves. Reduction rate K 2 of the corrosion rates for the Pd addition amount can be represented by the following formula, K 2 = - when determining the range of (corrosion rate) / (Pd amount) preferably K 2 from the data of FIG. 2, K 2
≈ 0.32 (220 ° C) to 0.52 (180 ° C). Then, as a ratio of K 1 and K 2 , K (= K 1 / K 2 )
Calculating the range of K = 4 (180 ° C) to 8 (220
℃).
【０００９】[0009]
【作用】本発明の溶接材料は、Ｓｉを５〜７％含有する
オーステナイト系ステンレス鋼母材に対して使用するも
のであり、Ｓｉの含有量を４〜６％の範囲にして延性を
確保し、Ｐｄは０．０１〜１．０７％の範囲、好ましく
は０．２〜０．５％の範囲で添加することにより、耐食
性を向上させたもので、各成分の限定理由は以下の通り
である。 Ｃ：Ｃはステンレス鋼の耐食性に有害であるが、強度の
観点からある程度含有させる必要はある。しかし、０．
０４％を越えると耐食性が大幅に低下するので、含有量
の上限値は０．０４％ととした。 Ｓｉ：Ｓｉは本発明の基本成分である。高温高濃度硫酸
用若しくは高温高濃度硝酸用の母材は、５〜７％程度の
Ｓｉを含有している。この母材に対して共金を溶接材料
として用いる場合は、Ｓｉ含有量が６％を越えると溶着
金属部が著しく硬化して延性が低下する。それ故、溶接
材料のＳｉ含有量の上限は６％ととする。また、溶接部
の延性を十分に得るためには、溶接材料のＳｉ含有量は
母材と比較して低めに設定し、かつ、Ｐｄの添加による
耐食性の向上が可能な範囲とし、Ｓｉ含有量の下限を４
％とする。 Ｍｎ：脱硫剤として、また耐高温割れ性の向上のために
１〜５％含有させる。The welding material of the present invention is used for an austenitic stainless steel base material containing 5 to 7% Si, and the ductility is ensured by setting the Si content in the range of 4 to 6%. , Pd is added in the range of 0.01 to 1.07%, preferably in the range of 0.2 to 0.5% to improve the corrosion resistance, and the reasons for limiting each component are as follows. is there. C: C is harmful to the corrosion resistance of stainless steel, but it must be contained to some extent from the viewpoint of strength. However, 0.
If it exceeds 04%, the corrosion resistance is significantly reduced, so the upper limit of the content is made 0.04%. Si: Si is a basic component of the present invention. The base material for high-temperature high-concentration sulfuric acid or high-temperature high-concentration nitric acid contains Si of about 5 to 7%. When using common metal as a welding material with respect to this base material, if the Si content exceeds 6%, the welded metal portion is significantly hardened and ductility decreases. Therefore, the upper limit of the Si content of the welding material is 6%. Further, in order to obtain sufficient ductility of the welded portion, the Si content of the welding material is set to be lower than that of the base material, and the range is such that the corrosion resistance can be improved by the addition of Pd. Lower limit of 4
%. Mn: As a desulfurizing agent, it is contained in an amount of 1 to 5% for improving hot crack resistance.
【００１０】Ｃｒ：Ｃｒはステンレス鋼の基本成分であ
り、基本的に母材の含有量と同量とするため、高Ｓｉス
テンレス鋼の通常の範囲である１５〜２５％とする。 Ｎｉ：Ｃｒは高Ｓｉステンレス鋼において、オーステナ
イト組織にするために必要な元素であり、母材の含有量
と略同量とするため、４〜２５％とする。 Ｐｄ：Ｐｄは微量添加成分であるが、本発明の基本成分
であり、高温高濃度硫酸（９８％，１８０〜２２０℃程
度）中における高Ｓｉオーステナイト系ステンレス鋼の
耐食性を向上するためには、０．０１％以上の添加が必
要である。特に、母材のＳｉ含有量が６％を越える場合
には、溶接部の延性を確保するために溶接材料のＳｉ成
分を母材に対して低めに設定するので、溶着金属部のＳ
ｉ含有量の不足による耐食性の低下を補う意味で上記の
ようにＰｄを添加する。また、母材のＳｉ含有量が６％
以下の場合においても、Ｐｄの添加により溶接部の耐食
性を向上させることができる。Ｐｄ添加量は、母材のＳ
ｉ含有量によって適宜決定されるが、耐食性の向上はＰ
ｄ１．０７％を越えると飽和する。従って、Ｐｄ添加量
は０．０１〜１．０７％の範囲、好ましくは、０．２〜
０．５％の範囲で添加される。 Ｐ：Ｐは、耐食性並びに高温割れ性の観点から少ない方
が望ましく、０．０３％以下とする。Cr: Cr is a basic component of stainless steel, and is basically the same as the content of the base metal. Therefore, it is set to 15 to 25% which is the usual range of high Si stainless steel. Ni: Cr is an element necessary for forming an austenite structure in high Si stainless steel, and is approximately the same as the content of the base material, so it is set to 4 to 25%. Pd: Pd is a minor additive component, but is a basic component of the present invention, and in order to improve the corrosion resistance of high Si austenitic stainless steel in high temperature high concentration sulfuric acid (98%, about 180 to 220 ° C.), It is necessary to add 0.01% or more. In particular, when the Si content of the base metal exceeds 6%, the Si component of the welding material is set lower than that of the base metal in order to secure the ductility of the welded portion, so
Pd is added as described above in the sense of compensating for the decrease in corrosion resistance due to lack of i content. Also, the Si content of the base material is 6%
Also in the following cases, the corrosion resistance of the welded portion can be improved by adding Pd. The amount of Pd added is S for the base metal.
Although it is appropriately determined depending on the i content, the improvement in corrosion resistance is P
When d exceeds 1.07%, it becomes saturated. Therefore, the amount of Pd added is in the range of 0.01 to 1.07%, preferably 0.2 to 1.0%.
It is added in the range of 0.5%. From the viewpoints of corrosion resistance and hot cracking resistance, it is desirable that P: P is as small as possible, and is 0.03% or less.
【００１１】[0011]
（実施例１〜４、比較例１〜４）表１に記載の化学組成
（重量％）を有する母材１を用い、実施例１〜４並びに
比較例１〜４の溶接材料は、母材１に対してＳｉ及びＰ
ｄの配合組成（重量％）を表２に記載のとおりに調整し
たものを使用した。これらの溶接材料を真空溶解して２
５ｋｇのインゴットを得て、ステンレス鋼としての所定
の熱処理を施した後、放電加工でＴＩＧ溶接用ワイヤー
に加工した。そして、この溶接用ワイヤーを用いてＴＩ
Ｇ溶接を行い、溶接部の曲げ試験及び腐食試験を行い、
表２にその結果を示した。なお、表中ΔＳｉは（母材の
Ｓｉ量）─（溶接材料のＳｉ量）である。(Examples 1 to 4, Comparative Examples 1 to 4) The base material 1 having the chemical composition (% by weight) shown in Table 1 was used, and the welding materials of Examples 1 to 4 and Comparative Examples 1 to 4 were base materials. Si and P for 1
The composition (weight%) of d was adjusted as shown in Table 2 and used. Vacuum melting these welding materials 2
A 5 kg ingot was obtained, subjected to a predetermined heat treatment as stainless steel, and then processed into a TIG welding wire by electric discharge machining. Then, using this welding wire, TI
G welding, bending test and corrosion test of welded part,
The results are shown in Table 2. In the table, ΔSi is (Si amount of base material)-(Si amount of welding material).
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】溶接継手は、長さ１００ｍｍ、幅３００ｍ
ｍ、厚さ１５ｍｍの母材の中央にＶ型開先を設け、ＴＩ
Ｇ溶接により突合せ継手を作製した。溶接試験に用いた
母材は、溶接材料のＳｉ含有量とほぼ同量とした。母材
は真空溶解炉で２５ｋｇのインゴットを作製し、熱間鍛
造により板厚１５ｍｍに仕上げた後所定の溶体化処理を
施した。上記の溶接材料は２５ｋｇインゴットより、鍛
造、熱処理を施した後放電加工により、２ｍｍ×２ｍｍ
及び１．５ｍｍ×１．５ｍｍ断面を有するワイヤーを作
製した。ＴＩＧ溶接条件は、全て電流８０〜８５Ａ、電
位１１Ｖ、溶接速度９〜１０ｃｍ／ｍｉｎとし、シール
ドガスにはＡｒを使用した。曲げ試験は、ＪＩＳＺ３１
２２の方法で行った。○は１８０o 合格、×はクラック
発生を意味する。腐食試験は、試験片（４０ｍｍ×３０
ｍｍ×３ｍｍ）を溶接継手部より採取し、１８０℃の９
８％硫酸液中に２４時間浸漬し、試験片の重量減により
腐食速度算出した。表中耐食性の◎は腐食速度が０．１
２以下、○は０．１２〜０．２、△は０．２〜０．２
５、×は０．２５以上を意味する。表２から明らかなよ
うに、実施例１〜４の溶接材料を使用したＴＩＧ溶接部
は、全て曲げ試験を満足し、十分な延性を有することが
分かる。また、溶接部の耐食性は母材１と同等であり、
十分な耐食性を有することが分かる。しかし、比較例
１，２は曲げ試験を満足せず、また、比較例３，４は耐
食性が十分でないことが分かる。The welded joint has a length of 100 mm and a width of 300 m.
The V-shaped groove is provided in the center of the base material of m
A butt joint was produced by G welding. The base material used in the welding test was set to be approximately the same as the Si content of the welding material. As the base material, an ingot of 25 kg was prepared in a vacuum melting furnace, and the plate thickness was 15 mm by hot forging, and then a predetermined solution heat treatment was applied. The above welding material is a 25 kg ingot and is forged and heat-treated, and then 2 mm x 2 mm by electric discharge machining.
And a wire having a 1.5 mm × 1.5 mm cross section was produced. The TIG welding conditions were a current of 80 to 85 A, a potential of 11 V, a welding speed of 9 to 10 cm / min, and Ar was used as a shield gas. The bending test is JISZ31
22 method. ◯ means 180 ° pass, and × means cracking. Corrosion test is performed on the test piece (40 mm × 30
mm × 3 mm) from the welded joint,
The sample was immersed in an 8% sulfuric acid solution for 24 hours, and the corrosion rate was calculated by reducing the weight of the test piece. In the table, ◎ for corrosion resistance indicates a corrosion rate of 0.1
2 or less, ○ is 0.12 to 0.2, Δ is 0.2 to 0.2
5, x means 0.25 or more. As is clear from Table 2, all the TIG welds using the welding materials of Examples 1 to 4 satisfy the bending test and have sufficient ductility. Also, the corrosion resistance of the welded portion is equivalent to that of the base material 1,
It can be seen that it has sufficient corrosion resistance. However, it can be seen that Comparative Examples 1 and 2 do not satisfy the bending test, and Comparative Examples 3 and 4 do not have sufficient corrosion resistance.
【００１５】（実施例５〜８、比較例５〜８）表１に記
載の化学組成（重量％）を有する母材２を用い、実施例
５〜８並びに比較例５〜８の溶接材料は、母材２に対し
てＳｉ及びＰｄの配合組成（重量％）を表３に記載のと
おりに調整したものを使用し、実施例１と同様に溶接材
料を作成し、同様の曲げ試験及び腐食試験を行い、結果
を表３に示した。なお、腐食試験に使用する硫酸液の温
度は２２０℃に変更した。表３から明らかなように、実
施例５〜８の溶接材料を使用したＴＩＧ溶接部は、全て
曲げ試験を満足し、十分な延性を有することが分かる。
また、溶接部の耐食性は母材２と同等であり、十分な耐
食性を有することが分かる。しかし、比較例１，２は曲
げ試験を満足せず、また、比較例３，４は耐食性が十分
でないことが分かる。(Examples 5-8, Comparative Examples 5-8) Using the base material 2 having the chemical composition (% by weight) shown in Table 1, the welding materials of Examples 5-8 and Comparative Examples 5-8 were used. A welding material was prepared in the same manner as in Example 1 by using the composition in which the composition composition (% by weight) of Si and Pd was adjusted as shown in Table 3 with respect to the base material 2, and the same bending test and corrosion were performed. The test was conducted and the results are shown in Table 3. The temperature of the sulfuric acid solution used in the corrosion test was changed to 220 ° C. As is clear from Table 3, all the TIG welds using the welding materials of Examples 5 to 8 satisfy the bending test and have sufficient ductility.
Further, it can be seen that the corrosion resistance of the welded portion is equivalent to that of the base material 2 and that it has sufficient corrosion resistance. However, it can be seen that Comparative Examples 1 and 2 do not satisfy the bending test, and Comparative Examples 3 and 4 do not have sufficient corrosion resistance.
【００１６】[0016]
【表３】 [Table 3]
【００１７】[0017]
【発明の効果】本発明は、Ｓｉ含有量が５〜７％の高Ｓ
ｉオーステナイト系ステンレス鋼の溶接材料において、
Ｐｄ添加量を調整することより高温高濃度硫酸や高温高
濃度硝酸の環境下で優れた耐食性と良好な延性を溶接部
に対して付与することが可能になり、大型構造物等への
適用も可能になった。The present invention has a high S content of 5 to 7% Si.
i In the welding material of austenitic stainless steel,
By adjusting the amount of Pd added, it becomes possible to impart excellent corrosion resistance and good ductility to welds under the environment of high temperature high concentration sulfuric acid and high temperature high concentration nitric acid, and it can be applied to large structures etc. It became possible.
【図面の簡単な説明】[Brief description of drawings]
【図１】１７．５Ｃｒ−１７．５Ｎｉ−５〜８Ｓｉ系の
溶接材料を用いたＳｉ含有ステンレス鋼溶接部における
Ｓｉ含有量と腐食速度の関係を示したグラフである。FIG. 1 is a graph showing the relationship between the Si content and the corrosion rate in a Si-containing stainless steel weld using a 17.5Cr-17.5Ni-5-8Si-based welding material.
【図２】１７．５Ｃｒ−１７．５Ｎｉ−５．５Ｓｉ−Ｐ
ｄ系の溶接材料を用いＳｉ含有ステンレス鋼溶接部にお
けるＰｄ含有量と腐食速度の関係を示したグラフであ
る。FIG. 2 is 17.5Cr-17.5Ni-5.5Si-P.
5 is a graph showing the relationship between the Pd content and the corrosion rate in a Si-containing stainless steel weld using a d-based welding material.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山田 義和 広島市西区観音新町四丁目６番22号 三菱 重工業株式会社広島研究所内 (72)発明者 長野 肇 東京都千代田区丸の内二丁目５番１号 三 菱重工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshikazu Yamada, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Inventor Hajime Nagano 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Sanryo Heavy Industries Co., Ltd.
Claims (2)
〜６％、Ｍｎが１〜５％、Ｃｒが１５〜２５％、Ｎｉが
４〜２５％、Ｐｄが０．０１〜１．０７％、残部が実質
的にＦｅからなることを特徴とするＳｉを５〜７％含有
するオーステナイト系ステンレス鋼用の溶接材料。1. C by weight is 0.04% or less and Si is 4 by weight.
.About.6%, Mn 1 to 5%, Cr 15 to 25%, Ni 4 to 25%, Pd 0.01 to 1.07%, and the balance being substantially Fe. A welding material for austenitic stainless steel containing 5 to 7%.
次式を満たすＰｄを含有することを特徴とする請求項１
記載の溶接材料。 Ｐｄ（％）≧（１／Ｋ）｛母材のＳｉ（％）−溶接材料
のＳｉ（％）｝ 但し、Ｋ＝４〜８2. When the Si content of the base material is 6% or more,
A Pd containing the following formula is contained:
The welding material described. Pd (%) ≧ (1 / K) {Si (%) of base material−Si (%) of welding material} where K = 4 to 8
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26189191A JP2796460B2 (en) | 1991-10-09 | 1991-10-09 | Welding material for high Si content stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26189191A JP2796460B2 (en) | 1991-10-09 | 1991-10-09 | Welding material for high Si content stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05104282A true JPH05104282A (en) | 1993-04-27 |
| JP2796460B2 JP2796460B2 (en) | 1998-09-10 |
Family
ID=17368205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26189191A Expired - Lifetime JP2796460B2 (en) | 1991-10-09 | 1991-10-09 | Welding material for high Si content stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2796460B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7718014B2 (en) | 2001-11-19 | 2010-05-18 | Nippon Steel Corporation | Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid |
-
1991
- 1991-10-09 JP JP26189191A patent/JP2796460B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7718014B2 (en) | 2001-11-19 | 2010-05-18 | Nippon Steel Corporation | Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid |
| US7731896B2 (en) | 2001-11-19 | 2010-06-08 | Nippon Steel Corporation | Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2796460B2 (en) | 1998-09-10 |
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