JP2010151327A - Refrigeration cycle apparatus - Google Patents

Refrigeration cycle apparatus Download PDF

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JP2010151327A
JP2010151327A JP2007084566A JP2007084566A JP2010151327A JP 2010151327 A JP2010151327 A JP 2010151327A JP 2007084566 A JP2007084566 A JP 2007084566A JP 2007084566 A JP2007084566 A JP 2007084566A JP 2010151327 A JP2010151327 A JP 2010151327A
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stainless steel
refrigeration cycle
pipe
cycle apparatus
heat exchanger
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Tomoshi Shimizu
知史 清水
Hidekazu Aikawa
英一 相川
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Toshiba Carrier Corp
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Priority to PCT/JP2008/053832 priority patent/WO2008117636A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and durable refrigeration cycle apparatus including refrigerant pipes low in cost and excelling in pressure resisting characteristics and corrosion resisting characteristics. <P>SOLUTION: The refrigeration cycle apparatus comprises: a compressor; a first heat exchanger; a decompressor, and a second heat exchanger, which are communicatd with one another through the refrigerant pipes, wherein the refrigerant pipes at least partially consist of a ferrite stainless welded pipes having a nickel content of 0.6% or less. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、空気調和機やヒートポンプ式給湯機等に用いる冷凍サイクル装置に係り、特に冷媒配管の材質を改良した冷凍サイクル装置に関する。   The present invention relates to a refrigeration cycle apparatus used for an air conditioner, a heat pump type hot water heater, and the like, and more particularly, to a refrigeration cycle apparatus having an improved material for refrigerant piping.

従来、空気調和機やヒートポンプ式給湯機等に用いる冷凍サイクル装置の冷媒配管は、加工性が良く、熱伝導性の良い銅管が使用されていた。   Conventionally, a refrigerant pipe of a refrigeration cycle apparatus used for an air conditioner, a heat pump type hot water heater or the like has a good workability and a copper pipe having a good thermal conductivity.

しかしながら、冷凍サイクル装置の冷媒としてＲ４１０Ａや二酸化炭素等の高圧冷媒が用いられるようになったことから、ロー付け等の熱により加熱部分の材料強度が低下したり、あるいは、価格が高騰している銅管に替わる配管の採用が検討されている。   However, since a high-pressure refrigerant such as R410A or carbon dioxide has come to be used as a refrigerant for the refrigeration cycle apparatus, the material strength of the heated portion is reduced by heat such as brazing or the price is rising. Adoption of pipes to replace copper pipes is being studied.

従来、冷媒配管などとして、オーステナイト系ステンレスのＳＵＳ３０４が用いられているが、曲げ加工、拡管加工、フレア加工等によって、配管に応力が生じ、Ｒ４１０Ａや二酸化炭素等の高圧冷媒を流す冷媒配管として用いると、加工時の残留応力に起因する応力腐食により、冷媒配管に割れ等が発生するおそれがある。   Conventionally, austenitic stainless steel SUS304 is used as a refrigerant pipe, etc., but it is used as a refrigerant pipe through which stress is generated in the pipe by bending, expanding, flaring, etc., and a high-pressure refrigerant such as R410A or carbon dioxide flows. In addition, there is a risk that cracks or the like may occur in the refrigerant piping due to stress corrosion caused by residual stress during processing.

なお、特許文献１には、冷媒配管が一般的なアルミニウム、ステンレス、銅、それらを含む合金の内の少なくとも１種からなるＣＯ２冷媒回路が開示されている。
特開２００１−１４１３１６号公報 Patent Document 1 discloses a CO 2 refrigerant circuit in which the refrigerant pipe is made of at least one of general aluminum, stainless steel, copper, and alloys containing them.
JP 2001-141316 A

本発明は上述した事情を考慮してなされたもので、安価で耐圧特性と耐食特性が優れる冷媒配管を備え、安価で耐久性ある冷凍サイクル装置を提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an inexpensive and durable refrigeration cycle apparatus including a refrigerant pipe that is inexpensive and excellent in pressure resistance and corrosion resistance.

上述した目的を達成するため、本発明に係る冷凍サイクル装置は、圧縮機、第１の熱交換器、減圧装置、第２の熱交換器を冷媒配管により連通してなる冷凍サイクル装置において、前記冷媒配管の少なくとも一部をニッケルの含有量が０．６ｍａｓｓ％以下であるフェライト系ステンレス溶接管で形成したことを特徴とする。   In order to achieve the above-described object, a refrigeration cycle apparatus according to the present invention includes a compressor, a first heat exchanger, a decompression apparatus, and a second heat exchanger that are communicated with each other through a refrigerant pipe. At least a part of the refrigerant pipe is formed of a ferritic stainless steel welded pipe having a nickel content of 0.6 mass% or less.

本発明に係る冷凍サイクル装置によれば、安価で耐圧特性と耐食特性が優れる冷媒配管を備え、安価で耐久性ある冷凍サイクル装置を提供することができる。   According to the refrigeration cycle apparatus according to the present invention, it is possible to provide an inexpensive and durable refrigeration cycle apparatus including a refrigerant pipe that is inexpensive and excellent in pressure resistance and corrosion resistance.

本発明に係る冷凍サイクル装置の一実施形態について添付図面を参照して説明する。   An embodiment of a refrigeration cycle apparatus according to the present invention will be described with reference to the accompanying drawings.

図１は本発明の一実施形態に係る冷凍サイクル装置の冷凍サイクル図である。   FIG. 1 is a refrigeration cycle diagram of a refrigeration cycle apparatus according to an embodiment of the present invention.

図１に示すように、本実施形態の冷凍サイクル装置１は、例えば空気調和装置に組み込まれて使用され、圧縮機２、冷媒配管３、四方弁４、冷媒配管５、パックトバルブ６、冷媒配管７、第１の熱交換器としての室内熱交換器８、冷媒配管９、パックトバルブ１０、冷媒配管１１、電子膨張弁１２、第２の熱交換器としての室外熱交換器１３、冷媒配管１４、四方弁４、冷媒配管１５、圧縮機２に設けるアキュムレータ２ａを順次接続して形成する。   As shown in FIG. 1, the refrigeration cycle apparatus 1 of the present embodiment is used by being incorporated in, for example, an air conditioner, and includes a compressor 2, a refrigerant pipe 3, a four-way valve 4, a refrigerant pipe 5, a packed valve 6, and a refrigerant. Pipe 7, indoor heat exchanger 8 as a first heat exchanger, refrigerant pipe 9, packed valve 10, refrigerant pipe 11, electronic expansion valve 12, outdoor heat exchanger 13 as a second heat exchanger, refrigerant The pipe 14, the four-way valve 4, the refrigerant pipe 15, and the accumulator 2a provided in the compressor 2 are sequentially connected and formed.

室内熱交換器８はフィンチューブ型の熱交換器であり、室内用送風ファン１６が近接して配され、室内熱交換器８および室内用送風ファン１６を、室内ユニット本体（図示せず）に収容して、室内ユニットを形成する。   The indoor heat exchanger 8 is a fin-tube heat exchanger, and an indoor blower fan 16 is disposed in proximity to the indoor heat exchanger 8 and the indoor blower fan 16 in an indoor unit main body (not shown). Accommodates and forms an indoor unit.

一方、室外熱交換器１３はフィンチューブ型の熱交換器であり、室外用送風ファン１７が近接して配され、室外熱交換器１３および室外用送風ファン１７を含み、室内熱交換器８および室内用送風ファン１６を除く冷凍サイクル構成要素２−６、１０−１４を室外ユニット本体（図示せず）に収容して、室外ユニットを形成する。   On the other hand, the outdoor heat exchanger 13 is a fin-tube heat exchanger, and is provided with an outdoor fan 17 in close proximity, including the outdoor heat exchanger 13 and the outdoor fan 17, and the indoor heat exchanger 8 and The refrigeration cycle components 2-6 and 10-14 excluding the indoor blower fan 16 are accommodated in an outdoor unit main body (not shown) to form an outdoor unit.

上記冷凍サイクル構成要素のうち、室外ユニット本体に収容される冷媒配管、すなわち圧縮機２と四方弁４を接続する冷媒配管（吐出管）３、四方弁４とパックトバルブ６の間を接続する冷媒配管５、四方弁４と室外熱交換器１３を接続する冷媒配管１４、四方弁４と圧縮機２に設けるアキュムレータ２ａを接続する冷媒配管（吸込管）１５には、ステンレス溶接管を用いる。   Among the refrigeration cycle components, the refrigerant pipe accommodated in the outdoor unit main body, that is, the refrigerant pipe (discharge pipe) 3 that connects the compressor 2 and the four-way valve 4, and the four-way valve 4 and the packed valve 6 are connected. Stainless steel welded pipes are used for the refrigerant pipe 5, the refrigerant pipe 14 connecting the four-way valve 4 and the outdoor heat exchanger 13, and the refrigerant pipe (suction pipe) 15 connecting the four-way valve 4 and the accumulator 2 a provided in the compressor 2.

この本発明の冷凍サイクル装置に用いるステンレス溶接管には、Ｎｉ含有量が０．６ｍａｓｓ％以下のフェライト系ステンレス（材）を用いる。   For the stainless steel welded pipe used in the refrigeration cycle apparatus of the present invention, ferritic stainless steel (material) having a Ni content of 0.6 mass% or less is used.

このフェライト系ステンレスとして、表１に示すような化学組成を有する本発明に最適なステンレス（以下、本ステンレスという。）、ＳＵＳ４３０およびＳＵＳ４３４などが挙げられる。   Examples of the ferritic stainless steel include stainless steel (hereinafter, referred to as the present stainless steel) having the chemical composition as shown in Table 1 and SUS430 and SUS434.

本ステンレスは、Ｎｉ含有量が０．６ｍａｓｓ％以下で、Ｃｒ含有量が１９．００−２１．００ｍａｓｓ％であるのが好ましい。Ｎｂ含有量が（Ｃ含有率＋Ｎ含有率）の１０倍以上でかつ０．０３−０．０８ｍａｓｓ％、Ｃｕ含有量が０．３−０．６ｍａｓｓ％であるのがより好ましい。

Figure 2010151327
The stainless steel preferably has a Ni content of 0.6 mass% or less and a Cr content of 19.00-21.00 mass%. It is more preferable that the Nb content is 10 times or more of (C content + N content), 0.03-0.08 mass%, and the Cu content is 0.3-0.6 mass%.
Figure 2010151327

フェライト系ステンレスは、ＳＵＳ４３０（Ｃｒ＝１７％クロム、Ｃ＝０．１２％以下）で代表されるＣｒ系ステンレス鋼であり、熱処理によって硬化しないように、炭素量を低くしたものであり、特に本ステンレスはＣ含有量が０．０２％以下と少なく、加工硬化性が小さい。   Ferritic stainless steel is a Cr stainless steel represented by SUS430 (Cr = 17% chromium, C = 0.12% or less), and has a low carbon content so as not to be hardened by heat treatment. Stainless steel has a low C content of 0.02% or less, and has low work curability.

また、フェライト系ステンレスの成分は、鉄−クロム系が基本であり、ＪＩＳ鋼種はクロム量１１〜３２％で、炭素量は０．１２％以下であり、耐食性を増すため、モリブデンを含むものもある。   In addition, the ferritic stainless steel is basically composed of iron-chromium, the JIS steel grade has a chromium content of 11 to 32%, a carbon content of 0.12% or less, and some contain molybdenum to increase corrosion resistance. is there.

また、フェライト系ステンレスは、Ｃｒを１３％以上含む鉄−クロム合金はフェライト組織となり、結晶構造は体心立方であり、ＳＵＳ３０４などのオーステナイト系ステンレスに比べて錆びにくい特性を有し、Ｎｉ含有量が０．６ｍａｓｓ％以下とＮｉを多く含まない分、ＳＵＳ３０４および銅に比べて安価である。さらに、本ステンレスはＣｒ含有量が１９．００−２１．００ｍａｓｓ％であり、Ｃｒ含有量が多く、耐腐食性に優れる。   Ferritic stainless steel is an iron-chromium alloy containing 13% or more of Cr, and has a ferrite structure. The crystal structure is body-centered cubic, and has a characteristic that it is less likely to rust than austenitic stainless steel such as SUS304. Is less than 0.6 mass% and less expensive than SUS304 and copper because it does not contain much Ni. Further, the stainless steel has a Cr content of 19.00-21.00 mass%, a high Cr content, and excellent corrosion resistance.

また、表２に示すように、フェライト系ステンレスはマルテンサイト系ステンレスに比べて、加工性は優れ、クロムの量を増やしたものは、耐食性に優れ、また、熱伝導率、線膨張係数、引張強さおよび伸びなどは、普通の低炭素鋼並みであり、ＳＵＳ３０４などのオーステナイト系に比べて熱伝導率にもすぐれ、加工硬化性が小さい。

Figure 2010151327
In addition, as shown in Table 2, ferritic stainless steel is superior in workability compared to martensitic stainless steel, and the one with increased chromium content has excellent corrosion resistance, and also has thermal conductivity, linear expansion coefficient, tensile strength. Strength, elongation, and the like are the same as those of ordinary low carbon steel, and are superior in thermal conductivity as compared to austenite such as SUS304, and have low work hardening.
Figure 2010151327

本発明の冷凍サイクル装置に用いるステンレス溶接管は本ステンレスを用い、肉厚が外径の５％以下になるよう円筒状に成形し、シーム溶接する。   The stainless steel welded pipe used in the refrigeration cycle apparatus of the present invention uses this stainless steel, is formed into a cylindrical shape so that the thickness is 5% or less of the outer diameter, and is seam welded.

これにより、銅管およびＳＵＳ３０４を用いたステンレス溶接管に比べて安価で、耐圧特性と耐食特性に優れた冷媒配管が得られ、また、肉厚が外径の５％以下にすることで、可撓性が向上し、曲げ加工などの加工時の取り扱いが容易になる。   This makes it possible to obtain a refrigerant pipe that is cheaper and superior in pressure resistance and corrosion resistance compared to a stainless steel welded pipe using copper pipe and SUS304, and is possible by making the wall thickness 5% or less of the outer diameter. Flexibility is improved, and handling during processing such as bending becomes easy.

本ステンレス溶接管同士あるいは本ステンレス溶接管と銅管の接合は、炎ロー付けまたは接着により行う。   The stainless steel welded pipes or the stainless steel welded pipe and the copper pipe are joined by flame brazing or bonding.

本ステンレスは、銅よりも材料強度が強く、薄肉にしても耐圧強度を確保でき、銅に比べると１／２の肉厚で同一耐圧を得ることが可能である。   This stainless steel has a material strength stronger than copper, and even if it is thin, it can secure a pressure resistance, and it can obtain the same pressure resistance with a thickness of 1/2 that of copper.

なお、冷媒配管７および冷媒配管９は、室内ユニットと室外ユニット間に設けられる接続配管であり、空気調和装置の据付時などに可撓性が必要であり、従来の脱酸銅管を用いてもよい。   In addition, the refrigerant | coolant piping 7 and the refrigerant | coolant piping 9 are connection piping provided between an indoor unit and an outdoor unit, and flexibility is required at the time of installation of an air conditioning apparatus, etc., using the conventional deoxidation copper pipe | tube. Also good.

次に、本ステンレスが応力腐食に優れることを説明する。   Next, it will be explained that this stainless steel is excellent in stress corrosion.

図２は表１に示す化学組成の本ステンレスとＳＵＳ３０４のＭｇＣｌ２溶液中の耐応力腐食割れ試験の結果を示す特性線図である。この特性はＭｇＣｌ２（塩化マグネシウム溶液）中での応力負荷に対する応力腐食割れの発生応力と時間の関係を示す。 FIG. 2 is a characteristic diagram showing the results of a stress corrosion cracking test in a stainless steel and SUS304 MgCl 2 solution having the chemical composition shown in Table 1. This characteristic shows the relationship between stress occurrence stress stress and time with respect to stress load in MgCl 2 (magnesium chloride solution).

負荷応力３００Ｎ／ｍｍ２の場合、ＳＵＳ３０４が約０．７時間で破断を生じるのに対して、本ステンレスは約７時間と１０倍の腐食強度を有し、負荷応力２５０Ｎ／ｍｍ２の場合、ＳＵＳ３０４が約１時間で破断を生じるのに対して、本ステンレスは約１０時間と１０倍の腐食強度を有する。 In the case of a load stress of 300 N / mm 2 , SUS304 breaks in about 0.7 hours, whereas this stainless steel has a corrosion strength of about 7 hours and 10 times, and in the case of a load stress of 250 N / mm 2 , While SUS304 breaks in about 1 hour, this stainless steel has about 10 hours and 10 times the corrosion strength.

また、ＳＵＳ３０４は負荷応力２００Ｎ／ｍｍ２の場合、約３時間、負荷応力１５０Ｎ／ｍｍ２の場合、約５時間、負荷応力１００Ｎ／ｍｍ２の場合、約１０時間であるのに対して、本ステンレスは負荷応力約１９０Ｎ／ｍｍ２の場合、約５０時間、約１００時間、約７００時間といずれも、ＳＵＳ３０４の破断時間を大幅に上回り、大きな腐食強度を有することがわかる。 SUS304 has a load stress of 200 N / mm 2 for about 3 hours, a load stress of 150 N / mm 2 for about 5 hours, and a load stress of 100 N / mm 2 for about 10 hours. It can be seen that stainless steel has a large corrosion strength at a load stress of about 190 N / mm 2 which is significantly longer than the fracture time of SUS304 at about 50 hours, about 100 hours, and about 700 hours.

上記のことから、本ステンレス溶接管を用いることで、曲げ加工、拡管加工、フレア加工により発生する応力に対して、応力腐食の問題を解決できる。   From the above, by using this stainless steel welded tube, the problem of stress corrosion can be solved with respect to the stress generated by bending, tube expansion, and flare processing.

本試験では、本ステンレスを用いたが、他にＳＵＳ４３０、ＳＵＳ４３４を用いても同様の結果が得られる。   Although this stainless steel was used in this test, the same result can be obtained by using SUS430 and SUS434.

また、本ステンレス管は、ロー付けや溶接接合しても、銅のように加熱部分の材料強度低下が少なく、接合後の信頼性が高い。さらに、耐腐食に優れ、安価で信頼性に優れた冷媒配管を提供できる。   Moreover, even if this stainless steel pipe is brazed or welded, there is little decrease in the material strength of the heated portion like copper, and the reliability after joining is high. Furthermore, it is possible to provide a refrigerant pipe excellent in corrosion resistance, inexpensive and excellent in reliability.

多くの熱交換器に用いる管は、ステンレス、アルミニウム、銅、鋼製であるが、本ステンレス管は、銅、アルミに対しての電食の発生が少なく、室内熱交換器、室外熱交換器をはじめ、いかなる熱交換器にも適用できる。   The tubes used in many heat exchangers are made of stainless steel, aluminum, copper, and steel. However, this stainless steel tube generates less electric corrosion on copper and aluminum, and is an indoor heat exchanger and outdoor heat exchanger. It can be applied to any heat exchanger.

また、図３に示すように、室外熱交換器１３あるいは室内熱交換器のヘアピン状で複数枚の伝熱フィン１３ａと嵌合、貫通するＵ管１３ｂに本ステンレス管や鋼管を用いる場合、Ｕ管１３ｂを接続するリターンベンド１３ｃには、異種の銅管または、アルミニウム管を使うのが好ましい。これにより、リターンベンドのように直線部の短い管部品は、加工性のよい異種材を併用することにより、製造性を向上させることができて、熱交換器全体としての製造コストを低減できる。   Moreover, as shown in FIG. 3, when using this stainless steel tube or a steel pipe for the U pipe 13b which fits and penetrates the heat transfer fin 13a in the hairpin shape of the outdoor heat exchanger 13 or the indoor heat exchanger, It is preferable to use a different kind of copper pipe or aluminum pipe for the return bend 13c connecting the pipe 13b. Thereby, a pipe part with a short straight portion such as a return bend can improve the manufacturability by using a dissimilar material having a good workability, and the manufacturing cost of the entire heat exchanger can be reduced.

上記のように、室外ユニット本体に収容される冷媒配管に本ステンレス溶接管を用いることで、本ステンレス溶接管が大気中の亜硫酸ガスなどに曝されても腐食がなく、耐久性がある。   As described above, by using the stainless steel welded pipe for the refrigerant pipe accommodated in the outdoor unit main body, even if the stainless welded pipe is exposed to sulfurous acid gas in the atmosphere, there is no corrosion and durability.

本実施形態に係る冷凍サイクル装置によれば、安価で耐圧特性と耐食特性が優れる冷媒配管を備え、安価で耐久性ある冷凍サイクル装置が実現する。   According to the refrigeration cycle apparatus according to the present embodiment, a low-cost and durable refrigeration cycle apparatus is realized that includes a refrigerant pipe that is inexpensive and has excellent pressure resistance and corrosion resistance.

本発明の一実施形態に係る冷凍サイクル装置の冷凍サイクル図。The refrigeration cycle figure of the refrigeration cycle apparatus which concerns on one Embodiment of this invention. 本発明に用いるステンレスと従来のＳＵＳ３０４の応力腐食強度特性線図。The stress corrosion strength characteristic diagram of stainless steel used in the present invention and conventional SUS304. 本発明の一実施形態に係る冷凍サイクル装置に用いる室外熱交換器の概念図。The conceptual diagram of the outdoor heat exchanger used for the refrigerating-cycle apparatus which concerns on one Embodiment of this invention.

符号の説明Explanation of symbols

１…冷凍サイクル装置、２…圧縮機、３…冷媒配管、４…四方弁、５…冷媒配管、６…パックトバルブ、７…冷媒配管、８…室内熱交換器、９…冷媒配管、１０…パックトバルブ、１１…冷媒配管、１２…電子膨張弁、１３…室外熱交換器、１４…冷媒配管、１５…冷媒配管。   DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle apparatus, 2 ... Compressor, 3 ... Refrigerant piping, 4 ... Four-way valve, 5 ... Refrigerant piping, 6 ... Packed valve, 7 ... Refrigerant piping, 8 ... Indoor heat exchanger, 9 ... Refrigerant piping, 10 DESCRIPTION OF SYMBOLS ... Packed valve, 11 ... Refrigerant piping, 12 ... Electronic expansion valve, 13 ... Outdoor heat exchanger, 14 ... Refrigerant piping, 15 ... Refrigerant piping.

Claims (3)

圧縮機、第１の熱交換器、減圧装置、第２の熱交換器を冷媒配管により連通してなる冷凍サイクル装置において、前記冷媒配管の少なくとも一部をＮｉ含有量が０．６ｍａｓｓ％以下であるフェライト系ステンレス溶接管で形成したことを特徴とする冷凍サイクル装置。 In the refrigeration cycle apparatus in which the compressor, the first heat exchanger, the decompression device, and the second heat exchanger are communicated with each other through a refrigerant pipe, at least a part of the refrigerant pipe has an Ni content of 0.6 mass% or less. A refrigeration cycle apparatus formed of a ferritic stainless steel welded pipe. 前記ステンレス溶接管は、Ｃｒ含有量が１９．００−２１．００ｍａｓｓ％であることを特徴とする請求項１に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to claim 1, wherein the stainless steel welded pipe has a Cr content of 19.00-21.00 mass%. 前記ステンレス溶接管は肉厚が管外径の５％以下であることを特徴とする請求項１に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to claim 1, wherein the stainless steel welded pipe has a wall thickness of 5% or less of the outer diameter of the pipe.
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