The storage temperature of stainless steel seamless elbows should be strictly controlled within the range of minus 5 ℃ to room temperature to prevent damage to material properties.
Its temperature control requirements:
Low temperature lower limit: ≥ -5 ℃ (below this temperature may lead to the risk of brittle cracking or frost cracking)
High temperature upper limit: ≤ room temperature (recommended 25 ℃) (high temperature environment is prone to oxidation, deformation or strength reduction)
Short term fluctuations: Avoid drastic temperature differences (such as moving from a freezer to a high-temperature zone) (thermal stress can accelerate material fatigue damage)
If the storage temperature is too low, a sudden drop in temperature can easily cause the pipe to crack at the point of sudden thickness change. Although some 304 stainless steel is resistant to extreme cold in the laboratory, protective packaging is required for pharmaceutical storage below -5 ℃.
Long term high temperature can damage the passivation film on the surface of stainless steel, and even induce microstructural changes beyond 50 ℃, affecting its pressure bearing capacity.
Stainless steel seamless pipes should be packaged with moisture-proof sealing and stored in indoor warehouses away from light.