JPS62179892A - Welding material for nitric acid resistant stainless steel - Google Patents
Welding material for nitric acid resistant stainless steelInfo
- Publication number
- JPS62179892A JPS62179892A JP2212886A JP2212886A JPS62179892A JP S62179892 A JPS62179892 A JP S62179892A JP 2212886 A JP2212886 A JP 2212886A JP 2212886 A JP2212886 A JP 2212886A JP S62179892 A JPS62179892 A JP S62179892A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- nitric acid
- corrosion
- corrosion resistance
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 74
- 238000003466 welding Methods 0.000 title claims abstract description 74
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 39
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 15
- 239000010935 stainless steel Substances 0.000 title claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 19
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 67
- 230000007797 corrosion Effects 0.000 abstract description 67
- 238000005336 cracking Methods 0.000 abstract description 37
- 229910052751 metal Inorganic materials 0.000 abstract description 11
- 239000002184 metal Substances 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 13
- 230000007423 decrease Effects 0.000 description 12
- 239000000203 mixture Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 238000005275 alloying Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 206010070834 Sensitisation Diseases 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008313 sensitization Effects 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 2
- 102000011782 Keratins Human genes 0.000 description 1
- 108010076876 Keratins Proteins 0.000 description 1
- 241000254158 Lampyridae Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3093—Fe as the principal constituent with other elements as next major constituents
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、一般化学プラント等のステンレス材料、特に
耐硝酸用ステンレス鋼に対する溶接材料に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a welding material for stainless steel materials for general chemical plants and the like, particularly for nitric acid-resistant stainless steel.
従来、Ａ ｆＱ ａ硝酸環境に使用される材料として、
アルミニウム、チタンと共に極低炭素−２５（ｌｉｒ
−２０Ｎｉステンレス鋼が実用化されている。この極低
炭素−２５Ｃｒ −２０Ｎｉステンレス鋼のＴＩＧ又は
ＭＩＧ溶接材料としては、母材と同組成材料では溶接金
属は完全オーステナイト組成になるが、極低炭素になる
と高温割れの発生が著しくなるので、高温割れの発生防
止に有効とされているＭｎ を２％程度含有させた極
低炭素−２５Ｃｒ −２０Ｎｉ −２Ｍｎ ステンレ
ス鋼溶接材料（ｓ １０ＵＬＯ）が実用化されている。Conventionally, materials used in A fQ a nitric acid environment include:
Along with aluminum and titanium, ultra-low carbon-25 (LIR)
-20Ni stainless steel has been put into practical use. As a TIG or MIG welding material for this ultra-low carbon -25Cr-20Ni stainless steel, if the material has the same composition as the base metal, the weld metal will have a completely austenitic composition, but if it becomes ultra-low carbon, the occurrence of high-temperature cracking will become significant. Ultra-low carbon-25Cr-20Ni-2Mn stainless steel welding material (s10ULO) containing about 2% Mn, which is effective in preventing the occurrence of hot cracking, has been put into practical use.
第１表に２５ Ｃｒ −２０Ｎｉ −２Ｍｎ ステン
レス鋼溶接材料（ＥＲ３１０）及び極低炭素２５ Ｃｒ
−２０Ｎｉ −２Ｍｎ （３１０Ｕ Ｌ （ｌｉ
）の溶接金属の硝酸腐食試駆と高温割れ試験結果の一例
を示す。Table 1 shows 25Cr-20Ni-2Mn stainless steel welding material (ER310) and ultra-low carbon 25Cr
-20Ni -2Mn (310U L (li
) shows an example of the results of nitric acid corrosion test and hot cracking test of weld metal.
第１衣において、通常の炭素含有量をもつ２５ Ｃｒ
−２０Ｎｉ −２Ｍｎ ステンレス鋼溶接材料（ＥＲ
３１０）は４規定硝酸溶液中では十分な耐食性をもつが
、Ｃｒ を含有した硝酸溶液では耐食性が低下し、
鋭敏化熱処理（６５０Ｃｘ ２ｈｒ ）材では著しい粒
界腐食を示す。またＣｒ６＋ を含有する１２規定硝酸
溶液中では溶接まま材及び鋭敏化熱処理材共に著しい粒
界腐食を示す。しかしながらパレストレイン試験による
高温割れ長さを見ると極めて小さく、非常に烏い耐高温
割れ性をもつことがわかる。In the first coating, 25 Cr with normal carbon content
-20Ni -2Mn Stainless steel welding material (ER
310) has sufficient corrosion resistance in a 4N nitric acid solution, but the corrosion resistance decreases in a nitric acid solution containing Cr.
The sensitized heat treated (650Cx 2hr) material shows significant intergranular corrosion. Furthermore, in a 12N nitric acid solution containing Cr6+, both the as-welded material and the sensitized heat-treated material exhibit significant intergranular corrosion. However, when looking at the hot cracking length determined by the palestrain test, it is found that the length is extremely small, indicating that the material has extremely high resistance to hot cracking.
これに比べ、極低炭素２５ Ｃｒ −２０Ｎｉ −２Ｍ
ｎ ステンレス鋼溶接材料（３１０ＵＬＣ）は、いブ
れの腐食液に対しても十分な耐食性を示すが、耐高温割
れ性は通常炭素含有量をもつ２５Ｃｒ −２０Ｎｉ −
２Ｍｎ ステンレス鋼溶接材料（ＥＲ３１０）に比べ
低下している。仁のように炭素含有量を低く抑えると耐
食性は向上するが耐高温割れ性は低下することがわかる
。In comparison, extremely low carbon 25 Cr -20Ni -2M
n Stainless steel welding material (310ULC) shows sufficient corrosion resistance even against the corrosive liquid of blister, but the hot cracking resistance is usually lowered by 25Cr-20Ni- which has a carbon content.
It is lower than 2Mn stainless steel welding material (ER310). It can be seen that when the carbon content is kept low, as in the case of keratin, corrosion resistance improves, but hot cracking resistance decreases.
以上のことから腐食性の強い硝酸溶液を使う化学プラン
トの場合、使用材料は、耐食性に主眼を置いて極低炭素
ステンレス鋼を用いる必要があるが、溶接金属に割れが
存在するとそこはいわゆるすき間を形成し、そこからす
き間腐食が発生・進行するため、結果的に耐食性を低下
させることになる。従って実際の溶接施工においては非
常にきびしい溶接管理を行わざるを得す、実用上大きな
問題となる。For the above reasons, in the case of chemical plants that use highly corrosive nitric acid solutions, it is necessary to use ultra-low carbon stainless steel as the material with a focus on corrosion resistance, but if there are cracks in the weld metal, there are so-called gaps. is formed, and crevice corrosion occurs and progresses from there, resulting in a decrease in corrosion resistance. Therefore, in actual welding work, very strict welding management has to be carried out, which poses a big practical problem.
そこで本発明においては、上記従来技術の欠点を排除し
腐食性の強い硝酸溶液に対し十分な耐食性を有する溶接
金属を作ると共に、耐高温割れ性の高い溶接材料を提供
しようとするものである。Therefore, the present invention aims to eliminate the above-mentioned drawbacks of the prior art, produce a weld metal that has sufficient corrosion resistance against highly corrosive nitric acid solutions, and provide a welding material that has high hot cracking resistance.
すなわち、本発明は耐硝酸用ＴｒＧ溶接又はＭＩＧ溶接
の材料で、化学成分がＸ景パーセントでＯ： ０．０２
％以下、Ｓｉ：０．１Ｘ以下、Ｍｎ：５〜６％、Ｐ：０
．０１．！￥以下、ｓ ： ｏ、ｏ １％以下、Ｎｉ
： ２０〜２２．５％、Ｃｒ：２５〜２８％、Ｎ ：
０．０５〜０．３％の範囲で含有され、残部がＦｅ
からなることを特徴とする耐硝酸用ステンレス鋼溶接材
料である。That is, the present invention is a material for nitric acid resistant TrG welding or MIG welding, and the chemical composition is O: 0.02 in X ratio.
% or less, Si: 0.1X or less, Mn: 5-6%, P: 0
．． 01. ! ¥ or less, s: o, o 1% or less, Ni
: 20-22.5%, Cr: 25-28%, N:
Contained in the range of 0.05 to 0.3%, with the balance being Fe
This is a nitric acid-resistant stainless steel welding material characterized by comprising:
本発明において、その化学成分の範囲を限定した理由を
以下に説明する。The reason for limiting the range of chemical components in the present invention will be explained below.
Ｃ：Ｃはオーステナイト結晶粒界Ｋ ０ｒ２３Ｃ６を形
成して粒界腐食を促進するので、Ｃの含有量は少なけれ
ば少ない程耐籾界腐食性は良好となる。現状の製造技術
ではＣの含有ｉ１１ ｏ、ｏ ｏ ｓＸＸ変度で低くす
ることは可能であるが、製造コストが高くなフ経済的で
ない。C: Since C forms austenite grain boundaries K 0r23C6 and promotes intergranular corrosion, the lower the C content, the better the rice grain interfacial corrosion resistance. Although it is possible to lower the C content i11 o, o o sXX variation with the current manufacturing technology, the manufacturing cost is high and it is not economical.
よって耐食性及び経済性の点からａｔは０．０２％以下
とした。Therefore, from the viewpoint of corrosion resistance and economical efficiency, at is set to 0.02% or less.
Ｓｉ：耐食性は８１ 童が０．１χより増加すると低
下しはじめ、８１ 量が多くなると熱間加工性が低下
し、溶接心線への加工が非常に困難となる。以上のこと
から、溶接中の脱酸性の確保にはＭｎ 等の他の元素で
おぎなうこととし、８１ 量は、耐食性と熱間加工性
から、０．１％以下とした。Si: Corrosion resistance begins to decline when the 81 content increases above 0.1χ, and as the 81 content increases, hot workability decreases and processing into weld core wires becomes extremely difficult. From the above, it was decided to supplement with other elements such as Mn to ensure deoxidizing properties during welding, and the amount of 81 was set to 0.1% or less from the viewpoint of corrosion resistance and hot workability.
Ｍｎニ一般［Ｍｎ はオーステナイト安定化元素で溶接
中の脱酸剤としても１〜２％添加される。本発明の極低
炭素−２５Ｃｒ −２０Ｎｉ系の完全オーステナイト組
織のものでは、溶接中に低融点偏析物による高温割れが
発生しやすい。この低融点偏析物の析出を防止するため
には、溶接材料中に３％以上のＭｎ ｆ：含有させるの
が非常に有効でちゃ、またＭｎ の含有量が６％・を
越えた場合には高温割れの発生も多くなる。Mn in general [Mn is an austenite stabilizing element and is also added in an amount of 1 to 2% as a deoxidizing agent during welding. In the ultra-low carbon-25Cr-20Ni-based completely austenitic structure of the present invention, hot cracking due to low melting point segregated substances is likely to occur during welding. In order to prevent the precipitation of these low melting point segregates, it is very effective to include 3% or more Mnf in the welding material, and if the Mn content exceeds 6%. The occurrence of hot cracking also increases.
一万、硝酸溶液に対する耐食性はＭｎ 、ｔが増加す
るにつれて次第に低下するが、７％以上になると大きい
粒界腐食が発生する。The corrosion resistance against nitric acid solution gradually decreases as Mn and t increase, but when it exceeds 7%, large intergranular corrosion occurs.
よって高温割れ及び耐食性の点からＭｎ ｉを３〜６
％に限定した。Therefore, from the viewpoint of hot cracking and corrosion resistance, Mn i is 3 to 6.
%.
Ｐ及びＳ二Ｐ及びＳはいずれも低融点偏析物を析出Ｌ′
″′ｒ恵伽領１ｈ塾仝出七訃入友宙外子畳であり、その
含有量は低くする程高温割れの防止には有効である。現
状の製造技術では、Ｐ及びＳの含有ｊｉｂを共ＫＯ，Ｏ
（ＭＸ程度まで低くすることは可能であるが、製造コス
トが高くなシ経済的でない。P and S2 Both P and S precipitate low melting point segregates L'
The lower the content, the more effective it is in preventing high-temperature cracking.With the current manufacturing technology, P and S containing jibs Both KO, O
(Although it is possible to lower it to the level of MX, the manufacturing cost is high and it is not economical.
よって、Ｐ及びＳの含有量はいずれも ０．０１ Ｘ以下とした。Therefore, the contents of P and S are both It was set to 0.01X or less.
ｃｒ： Ｃｒ ｔｉ耐硝酸性には最も有効な元素であり
、Ｃｒ 量が多いほど耐食性は良好である。しかし２８
％を超えてｃｒｔ−含有すると熱間加工性が悪く、しか
も完全なオーステナイト組繊が得られにくくなるため、
ｃｒ 量の上限を２８Ｘとした。Cr: CrTi is the most effective element for nitric acid resistance, and the greater the amount of Cr, the better the corrosion resistance. But 28
If crt- content exceeds %, hot workability will be poor and it will be difficult to obtain complete austenitic fibers.
The upper limit of cr amount was set to 28X.
よって耐食性及び熱間加工性の点から、Ｃｒ 針は２
５〜２８Ｘと限定した。Therefore, from the viewpoint of corrosion resistance and hot workability, the Cr needle is 2
It was limited to 5-28X.
Ｎｉ： Ｎｓ は代表的なオーステナイト安定化元素
であり、溶接性、耐食性、熱間加工性の良好な完全オー
ステナイト組織の溶接金属を得るために、Ｎ１ 量を
２０〜２２．５％と限定した。Ni: Ns is a typical austenite stabilizing element, and the amount of N1 was limited to 20 to 22.5% in order to obtain a weld metal with a fully austenitic structure that has good weldability, corrosion resistance, and hot workability.
Ｎ：ＮはＮ１ の３０倍もの強力なオーステナイト安
定化元素であり、Ｎの添加により一般には強度が上昇し
、延性は低下する傾向にある。またＮは耐食性に効果の
ある元素で、溶接材料中には０．０５％以上のＮを含有
させるのが非常に有効である。一方、溶接材料”中にＮ
が０．３％を超えて含有されると溶接中に溶融金属から
Ｎ２ ガスが発生し溶接金蔵中にブローホールが発生す
る。N: N is an austenite stabilizing element that is 30 times stronger than N1, and the addition of N generally tends to increase strength and decrease ductility. Furthermore, N is an element that is effective in improving corrosion resistance, and it is very effective to include 0.05% or more of N in the welding material. On the other hand, N in the welding material
If the content exceeds 0.3%, N2 gas will be generated from the molten metal during welding, and blowholes will occur in the weld metal.
よって、耐食性及びブローホールの発生から、Ｎ量は０
．０５〜０．５％と限定した。Therefore, from the viewpoint of corrosion resistance and the occurrence of blowholes, the amount of N is 0.
．． It was limited to 0.05 to 0.5%.
次に実施例をあけて本発明を具体的に説明する。Next, the present invention will be specifically explained with reference to Examples.
実施例に供した溶接材料はすべて真空溶解炉で溶解し、
熱間圧延及び冷間加工により１．６φ絽径の溶接ワイヤ
に伸線した。その化学成分を第２表に示す。All the welding materials used in the examples were melted in a vacuum melting furnace.
A welding wire with a diameter of 1.6φ was drawn by hot rolling and cold working. Its chemical composition is shown in Table 2.
腐食試験片はＪＩＳ Ｚ ５３２１に従って２〇−×２
５關Ｘ３朋のＭ着金属の試験片を採取した。The corrosion test piece was 20-x2 according to JIS Z 5321.
A test piece of M-coated metal measuring 5 mm x 3 mm was taken.
その際の溶接条件は次の通りである。The welding conditions at that time were as follows.
ＴＩＧ溶接：溶接電流１２０〜１５０Ａ電圧９〜０Ｖ
ワイヤ送給量８０〜１００酊／ｍｉｎ
シールドガス（Ａｒ）流量 １５−６／ｍｉｎＭＩＧ浴
接：溶接電流２４０〜２６０Ａ、電圧２４〜２６Ｖワイ
ヤ送給ｉ ２５０〜３００ ｍｍ ／ ｍｉｎシールド
ガス（ａｒ）流ｉ ２０ノ／ｗｉｎ腐食試験の硝酸濃
度は４規定及び１２規定の２種類とし、それぞれのもの
について、腐食加速剤としてＣｒ ｔ：２００ ｐ
ｐｍ添加したものと、碓加しないものの２種類すなわち
計４′Ｂｉ類を用いた。これらの溶液をそれぞれ沸騰状
態にし、その中に腐食試験片を４８時間、繰返し３回浸
漬しその後試験片を取り出しその腐食減量を調査した。TIG welding: Welding current 120-150A Voltage 9-0V Wire feed rate 80-100/min Shielding gas (Ar) flow rate 15-6/min MIG bath welding: Welding current 240-260A, Voltage 24-26V Wire feed i 250-300 mm/min shielding gas (AR) flow i 20/win The nitric acid concentration for the corrosion test was two types, 4 normal and 12 normal, and for each, Cr t: 200 p was used as a corrosion accelerator.
Two types of 4'Bi were used: one with pm added and one without. Each of these solutions was brought to a boiling state, and a corrosion test piece was repeatedly immersed therein for 48 hours three times, and then the test piece was taken out and its corrosion weight loss was investigated.
また試験片は、溶接ままのものと鋭敏化熱処理（６５０
ＣＸ２ｈｒ）ｌ、、たものについて試験した。In addition, the test pieces were as-welded and those subjected to sensitization heat treatment (650
CX2hr) was tested.
なお耐高温割れ性に及ぼす各元素：の効果についてｒｉ
トランスパレストレイン試験を実施して評価した。その
時の試験条件は次の通りである。Regarding the effect of each element on hot cracking resistance, ri
A transparestrain test was performed and evaluated. The test conditions at that time were as follows.
付加歪 ０．３％ 溶接電流２００人溶接電圧１０Ｖ
溶接速度１５０朋／ｍｉｎ試験後、溶接ピード表
面に発生した高温割れの総割れ長さを比較し耐高温割れ
性を評価した。Additional strain 0.3% Welding current 200 people Welding voltage 10V
After the test at a welding speed of 150 h/min, the total crack length of hot cracks generated on the welding bead surface was compared to evaluate hot cracking resistance.
実施例１
本発明溶接材料と代表的な比較材料の腐食試験結果とパ
レストレイン試験結果を第３表に示す。４規定及び１２
規定硝酸にＣｒ’＋ を添加した溶液ては添加しない溶
液に比べ本発明材料と比較材料のいずれも腐食量は大き
“くなる。また比較材料ノに１及びＡ５に比べＣ′Ｍの
低い比較材料４２、屋４及び本発明材料屓６はいずれも
腐食ｆは少なくかつ鋭敏化熱処理（ｂ５ａ７ｃｘ２ｈｒ
）の影響も非常に少ない。Example 1 Table 3 shows the results of the corrosion test and paleostrain test of the welding material of the present invention and typical comparative materials. 4 provisions and 12
In a solution in which Cr'+ is added to normal nitric acid, the corrosion amount of both the present invention material and the comparative material is greater than in a solution without the addition of Cr'+.Also, the comparative material has a lower C'M than 1 and A5. Materials 42, 4, and 6 of the present invention all have low corrosion f and have been subjected to sensitization heat treatment (b5a7cx2hr
) has very little influence.
パレストレイン試験結果によると、比較材料（母材）Ａ
１とＡ２ｆ比べるとＣ量の高い４１はＡ２より耐高温割
れ性に優れている。また比較材料（溶接ワイヤ）Ａ３と
Ａ４を比べると比較母材と同様にｃ−７の高いＡ３の耐
高温割れ性が高い。これはいずれもＣ量が低下すると耐
高温割れ性が低下することを示している。またＣ量が低
くかつ同レベルのＡ４とＡ５を比較するとＭｎ 量の多
い４５の方が耐高温割れ性は改善される傾向にある。し
かしながら両者の耐食性を比較するとＭｎ ：ｌの多
いＡ５はＡ４に比べ腐食減量が若干増加しており、耐食
性が低下していることを示している。このことから、耐
食性を向上させるためにＣ童を低く抑えると耐高温割れ
性が劣化し、耐高温割れ性を改善するためにＭｎ Ｎを
高くしすぎると耐食性が低下することがわかる。According to the palestrain test results, comparative material (base material) A
Comparing No. 1 and A2f, No. 41, which has a high C content, has better hot cracking resistance than A2. Furthermore, when comparing comparative materials (welding wires) A3 and A4, A3, which has a high c-7, has high hot cracking resistance, similar to the comparative base material. All of these indicate that as the amount of C decreases, the hot cracking resistance decreases. Furthermore, when comparing A4 and A5, which have a low C content and the same level, 45, which has a high Mn content, tends to have improved hot cracking resistance. However, when comparing the corrosion resistance of the two, A5 with a large amount of Mn:l shows a slight increase in corrosion loss compared to A4, indicating that the corrosion resistance is lower. From this, it can be seen that if the C content is kept low in order to improve corrosion resistance, the hot cracking resistance deteriorates, and if Mn N is increased too much in order to improve the hot cracking resistance, the corrosion resistance decreases.
本発明溶接材料Ａ６は、硝酸単独溶液及びＣｒ’＋が添
加された高ｇ度硝酸溶液でも腐食減量は非常に少なく、
かつ鋭敏化熱処理の影響もほとんど認められない。また
Ｔ、 Ｉ Ｇ溶接及びＭＩＧ溶接のいずれの溶接におい
ても腐食減量は非常に少なく、かつ鋭敏化熱処理の影響
もほとんど認められない。The welding material A6 of the present invention exhibits very little corrosion loss even in a nitric acid solution alone and in a high-g nitric acid solution to which Cr'+ is added.
Moreover, almost no influence of sensitization heat treatment is observed. In addition, the corrosion loss is very small in any of T, IG welding, and MIG welding, and almost no effect of sensitization heat treatment is observed.
一方、両溶接金属共に割れ長さはａＸの高い比較溶接材
料Ａ３と同レベルであり、耐高温割れ性もきわめて良い
こぶがわかる。On the other hand, the crack lengths of both weld metals are at the same level as comparative welding material A3, which has a high aX, and it can be seen that the cracks have extremely good hot cracking resistance.
以上のことから、本発明溶接材料は低濃度硝酸溶液から
、酸化力の強いＣｒ を含んだ高級度硝酸溶液まで
、非常に高い耐食性を有すると共に耐高温割れ性もきわ
めて高いことがわかる。From the above, it can be seen that the welding material of the present invention has extremely high corrosion resistance and high hot cracking resistance from low concentration nitric acid solutions to high-grade nitric acid solutions containing Cr, which has strong oxidizing power.
実施例２
本発明溶接材料の化学成分Ｑ中のＣを除く他の合金元素
をほぼ一定にして、Ｃの含有量のみが異なる溶接材料を
用いて腐食試験及びパレストレイン試験を実施した。そ
の結果を第４表に示す。Example 2 Corrosion tests and Palestrain tests were carried out using welding materials that differed only in the content of C, while keeping the other alloying elements in the chemical composition Q of the welding materials of the present invention almost constant except for C. The results are shown in Table 4.
本発明溶接材料Ａ６及びＡ７は４規定硝酸溶液及びｃｒ
６＋ 全添加した４規定硝酸溶液のいずれに対しても商
い耐食性を有しており、しかも硝酸？ａ度の高い１２規
定硝酸溶液及びＣｒ を添加した１２規定硝酸溶液
においても若干腐食減ｂ１が増加する程度で高い耐食性
を有していることが認められる。Welding materials A6 and A7 of the present invention are a 4N nitric acid solution and CR
6+ It has corrosion resistance against all added 4N nitric acid solutions, and even nitric acid? Even in a 12N nitric acid solution with a high degree of a and a 12N nitric acid solution to which Cr has been added, it is recognized that the material has high corrosion resistance as the corrosion loss b1 slightly increases.
しかし、本発明の化学成分範囲よりもＣ含有量の高い比
較溶接材料＾１９及び應２０ではＣｒ’＋ を添加した
１２規定硝酸溶液で著しい腐食が発生した。このように
材料中のＣの含有量は耐食性に非常に大きな影響をおよ
ばずことかわかる。However, in the comparative welding materials^19 and 20, which had a higher C content than the chemical composition range of the present invention, significant corrosion occurred in the 12N nitric acid solution to which Cr'+ was added. It can thus be seen that the C content in the material has a very large effect on corrosion resistance.
パレストレイン試験結果によると本発明溶接材料Ａ６、
Ａ７と比較溶接材料＾１９、Ａ ２０を比較するとＣの
増加により耐高温割れ性は若干改善される傾向にあるが
、いずれも篩い１酎高温割れ性を示している。According to the Palestrain test results, the present invention welding material A6,
Comparing A7 with comparative welding materials^19 and A20, there is a tendency for the hot cracking resistance to improve slightly due to an increase in C, but all of them show 1 sieve hot cracking resistance.
実施例３
本発明溶接材料の化学成分の中のＳｉ ｆ除く他の合
金元素をほぼ一定にして、Ｓｉ 含有量のみが異なる
溶接材料を用いて腐食試験とパレストレイン試験を実施
した。その試験結果を第５表に示す。Example 3 Corrosion tests and Palestrein tests were carried out using welding materials that differed only in Si content while keeping other alloying elements other than Si f in the chemical composition of the welding materials of the present invention almost constant. The test results are shown in Table 5.
本発明溶接材料＆６及びム８は硝酸濃度に関係なく、し
かもＣｒ’＋ が添加されても若干腐食量が増加するの
みで高い耐食性を有している。The welding materials &6 and M8 of the present invention have high corrosion resistance regardless of the nitric acid concentration, and even when Cr'+ is added, the amount of corrosion only increases slightly.
しかし、本発明の化学成分範囲よりもＳｉ 含有量の
多い比較溶接材料Ａ２１及びＡ２２の場合にはＣｒ
が添加された高投度硝酸溶液中で腐食量が増加する。However, in the case of comparative welding materials A21 and A22, which have a higher Si content than the chemical composition range of the present invention, Cr
The amount of corrosion increases in a high-strength nitric acid solution.
このように材料中の８１ 含有量は耐食性に大きな影
響を及ぼすことがわかる。It can thus be seen that the 81 content in the material has a significant effect on corrosion resistance.
パレストレイン試験によると本発明溶接材料屋６、扁８
及び比較浴接材料Ａ２１、Ａ２２のいずれも高い耐高温
割れ性を示しておシ、この程度のＳｉ 量の範囲では
耐高温割れ性に差は認められない。According to the Palestrain test, the welding material of the present invention was 6, and the bar was 8.
Both of the comparative bath welding materials A21 and A22 exhibited high hot cracking resistance, and no difference in hot cracking resistance was observed within this range of Si content.
実施例４
本発明ｍ接材料の化学成分の中のＭｎ を除く他の合
金元素をほば一定にしてＭｎ ｆｉｔのみが異なる溶
接材料を用いて腐食試験とパレストレイン試験を実施し
た。その結果を第６表に示す。Example 4 Corrosion tests and Palestrein tests were carried out using welding materials that differed only in Mn fit while keeping other alloying elements other than Mn in the chemical components of the welding materials of the present invention almost constant. The results are shown in Table 6.
いずれの材料も４規定及び１２規定の硝酸溶液とＣｒ６
＋ を添加した４規定の硝酸溶液中では十分な耐食性を
示すが、Ｃｒ を添加した１２規定硝酸溶液中では
Ｍｎ 量が７％を越えると大きな腐食減量を示した。Both materials were prepared using 4N and 12N nitric acid solutions and Cr6
It showed sufficient corrosion resistance in a 4N nitric acid solution to which + was added, but showed a large corrosion loss in a 12N nitric acid solution to which Cr was added when the Mn content exceeded 7%.
従って、耐食性の点からＭｎ ｉｔは６％以下である
ことが望ましい。Therefore, from the viewpoint of corrosion resistance, it is desirable that Mnit be 6% or less.
一方パレストレイン試験によると、本発明溶接材料Ａ６
、Ａ９、屋１０及びｌ６１１は高い耐高温割れ性を示す
が、Ｍｎ 盆が３Ｉ未満の比較母材屋２、及び比較溶
接材料應４、ｌ６２５では割れ長さが長くなり、Ｍｎ
ｔが３％未満では耐高温割れ性が低下することがわか
る。またＭｎ蚕が６％を越える比較溶接材料Ａ５及び墓
２４ではＭｎ 量の増加によシ耐高温割れ性が低下し
ており、これらのことから、耐高温割れ性の点からＭｎ
量は３％〜６％であることが必要である。On the other hand, according to the Palestrain test, the present invention welding material A6
, A9, Ya 10, and l611 show high hot cracking resistance, but the crack length is longer in comparison base material Ya 2, which has an Mn tray of less than 3I, and comparative welding material No. 4, and l625, and the Mn
It can be seen that when t is less than 3%, the hot cracking resistance decreases. In addition, in comparative welding materials A5 and Grave 24, which contain more than 6% Mn, the hot cracking resistance decreases due to the increased Mn content.
The amount should be between 3% and 6%.
実施例５
本発明溶接材料の化学成分の中のＮ１ を除く他の合
金元系をほぼ一定にしてＮ１ の含有量のみが異なる
溶接溶接材料を用いて腐食試験とパレストレイン試験を
実施した。その結果を第７表に示す。Example 5 Corrosion tests and Palestrain tests were carried out using welding materials that differed only in the content of N1 while keeping the other alloying elements of the chemical components of the welding materials of the present invention almost constant except for N1. The results are shown in Table 7.
本発明の化学成分範囲内のＮ１ 含有ｉｉ’をもつ溶
接材料Ａ６、Ａ１２及びＡ１５のいずれの溶液の中でも
高い耐食性金示すと共に耐高温割れ性もきわめて高いこ
とがわかる。It can be seen that all of the solutions of welding materials A6, A12 and A15 having N1 content ii' within the chemical composition range of the present invention exhibit high corrosion resistance and extremely high hot cracking resistance.
実施例６
本発明溶接材料の化学成分の中のＣｒ を除く他の合
金元１１含ば一定にして、ｃｒ の含有量のみが異な
る溶接材料を用いて腐食試験とパレストレイン試験を実
施した。その結果を第８表に示す。Example 6 Corrosion tests and paleostrain tests were carried out using welding materials that differed only in the content of cr, while keeping the other alloying elements 11 other than Cr constant in the chemical components of the welding materials of the present invention. The results are shown in Table 8.
本発明の化学成分範囲内のＣｒ 含有量をもつ溶接材
料４６、ｌ６１４及び扁１５はいずれの溶液の中でも高
い耐食性を示すと共に、耐高温割れ性もきわめて高いこ
とがわかる。It can be seen that welding materials 46, 1614, and flat plate 15 having a Cr content within the chemical composition range of the present invention exhibit high corrosion resistance in any solution, and also have extremely high hot cracking resistance.
実施例７
本発明溶接材料の化学成分の中のＮを除く他の合金元Ｓ
ｔ−はぼ一定にして、Ｈの含有量のみが異なる溶接材料
を用いて腐食試験とパレストレイン試験を実施した。そ
の結果を第９表に示す。Example 7 Other alloying elements S other than N in the chemical composition of the welding material of the present invention
A corrosion test and a pale strain test were conducted using welding materials that differed only in H content while keeping t- approximately constant. The results are shown in Table 9.
いずれの材料も４規定及び１２規定の硝酸溶液とＣｒ’
＋ を添加した４規定の硝酸溶液中では十分な耐食性を
示すが、Ｃｒ を添加し′ｆｃ１２規定硝酸溶液中
ではＮ量が０．０５％未満になると大きな腐食減量を示
した。従って、耐食性の点からＮ量は０．０５％以上で
あることが望ましい。Both materials were prepared using 4N and 12N nitric acid solutions and Cr'
It showed sufficient corrosion resistance in a 4N nitric acid solution to which Cr was added, but showed a large corrosion loss when the N content was less than 0.05% in a 12N nitric acid solution to which Cr was added. Therefore, from the viewpoint of corrosion resistance, it is desirable that the amount of N is 0.05% or more.
またパレストレイン試験によると、Ｎｉの増加により若
干割れ長さは増加する傾回にあるが、この程度のＮＷで
は、耐高温割れ性にほとんど差はなく、十分な耐割れ性
を示している。Furthermore, according to the palestrain test, the crack length tends to increase slightly as the Ni content increases, but with this level of NW, there is almost no difference in hot cracking resistance, indicating sufficient cracking resistance.
従って、耐食性及び耐高温割れ性の点からＮ蛍は０．０
５％以上でかつ、浴巌金属中のブローホール発生防止か
らａ、Ｓ Ｘ以下であることが必要である。Therefore, from the point of view of corrosion resistance and hot cracking resistance, N firefly is 0.0
It is necessary that the content is 5% or more and a, S X or less to prevent blowholes from occurring in the bath metal.
以上の説明から明らかなように、本発明溶接材料を用い
たＴＩＧ、ＭＩＧ溶接部は、酸化力の強い金属イオ／
Ｃｒ が共存する硝＠溶液に対して十分な耐食性を有
すると共に、高い耐高温割れ性を呈し、よって本発明溶
接材料は硝酸プラント等のステンレス材に対する溶接材
料をして好適である。As is clear from the above explanation, TIG and MIG welds using the welding material of the present invention can be produced by metal ions with strong oxidizing power.
The welding material of the present invention is suitable as a welding material for stainless steel materials in nitric acid plants, etc., since it has sufficient corrosion resistance against nitrate solutions containing Cr and exhibits high hot cracking resistance.
復代理人 内 １） 明 後代理人 萩 原 亮 − 復代理人 安 西 篤 夫Among the sub-agents: 1) Akira Second agent Ryo Hagi Hara - Sub-agent Atsuo Annishi
Claims (1)
分が重量パーセントでＣ：０．０２％以下、Ｓｉ：０．
１％以下、Ｍｎ：３〜６％、Ｐ：０．０１％以下、Ｓ：
０．０１％以下、Ｎｉ：２０〜２２．５％、Ｃｒ：２５
〜２８％、Ｎ：０．０５〜０．３％の範囲で含有され、
残部がＦｅからなることを特徴とする耐硝酸用ステンレ
ス鋼溶接材料。Nitric acid resistant TIG welding or MIG welding material with chemical components in weight percent: C: 0.02% or less, Si: 0.
1% or less, Mn: 3 to 6%, P: 0.01% or less, S:
0.01% or less, Ni: 20-22.5%, Cr: 25
~28%, N: contained in the range of 0.05 to 0.3%,
A nitric acid-resistant stainless steel welding material characterized in that the remainder is Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2212886A JPS62179892A (en) | 1986-02-05 | 1986-02-05 | Welding material for nitric acid resistant stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2212886A JPS62179892A (en) | 1986-02-05 | 1986-02-05 | Welding material for nitric acid resistant stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62179892A true JPS62179892A (en) | 1987-08-07 |
Family
ID=12074247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2212886A Pending JPS62179892A (en) | 1986-02-05 | 1986-02-05 | Welding material for nitric acid resistant stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62179892A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01306098A (en) * | 1988-06-03 | 1989-12-11 | Hitachi Ltd | Stainless steel welding material for nitric acid resistance and method of using said material |
| JP2012250255A (en) * | 2011-06-02 | 2012-12-20 | Nippon Yakin Kogyo Co Ltd | Stainless steel for welding |
| CN103831546A (en) * | 2014-03-25 | 2014-06-04 | 江苏双勤民生冶化设备制造有限公司 | Welding material for Incone1600 alloy |
| JP2015155116A (en) * | 2015-03-20 | 2015-08-27 | 日本冶金工業株式会社 | Thickness increasing method for weld stainless steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59222563A (en) * | 1983-06-01 | 1984-12-14 | Sumitomo Metal Ind Ltd | Austenitic stainless steel with superior corrosion resitance |
-
1986
- 1986-02-05 JP JP2212886A patent/JPS62179892A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59222563A (en) * | 1983-06-01 | 1984-12-14 | Sumitomo Metal Ind Ltd | Austenitic stainless steel with superior corrosion resitance |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01306098A (en) * | 1988-06-03 | 1989-12-11 | Hitachi Ltd | Stainless steel welding material for nitric acid resistance and method of using said material |
| JP2012250255A (en) * | 2011-06-02 | 2012-12-20 | Nippon Yakin Kogyo Co Ltd | Stainless steel for welding |
| CN103831546A (en) * | 2014-03-25 | 2014-06-04 | 江苏双勤民生冶化设备制造有限公司 | Welding material for Incone1600 alloy |
| JP2015155116A (en) * | 2015-03-20 | 2015-08-27 | 日本冶金工業株式会社 | Thickness increasing method for weld stainless steel |
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