Air conditioner

A refrigeration circuit comprising:

• a compressor to compress a refrigerant;
• a refrigeration cycle component disposed at and communicably coupled to at least one of an upstream side and a downstream side of the compressor, the refrigeration cycle component comprising a heat exchanger and a valve;
• and
• a stainless steel pipe having a first end thereof coupled to the compressor and a second end thereof coupled to one of the heat exchanger and the valve, the stainless steel pipe forming a single pipe between the compressor and the one of the heat exchanger and the valve, the stainless steel pipe having a corrugated part to attenuate vibration transferred from the compressor to the one of the heat exchanger and the valve,
• wherein at least a portion of the stainless steel pipe comprises the corrugated part, the corrugated part of the stainless steel pipe being integrally formed with a remaining portion of the stainless steel pipe,
• wherein the stainless steel is composed of, percent by weight, C:
• 0.03% or less, Si:
• exceeding 0 to 1.7% or less, Mn:
• 1.5 to 3.5%, Cr:
• 15.0 to 18.0%, Ni:
• 7.0 to 9.0%, Cu:
• 1.0 to 4.0%, Mo:
• 0.03% or less, P:
• 0.04% or less, S:
• 0.04% or less, N:
• 0.03% or less, and a balance:
• residue:
• Fe, and incidental impurities, and
• wherein the stainless steel has an austenite matrix structure and an average diameter of 30 to 60 μm.