Research and development of Chinese standard and American ASTM standard cryogenic seamless pipe
Low-temperature seamless steel pipes are mainly used in the production of ethylene, propylene, urea, synthetic ammonia, compound fertilizers, and other process equipment such as washing, purification, desulfurization, and degreasing in the pharmaceutical industry, as well as cryogenic equipment manufacturing, ultra-low temperature cold storage, and ultra-low temperature liquefaction. Gas pipelines and their pipe components, such as petroleum gas cryogenic separation equipment, air separation equipment, etc. There are two main types of low-temperature seamless steel pipe materials: austenitic and ferrite. The difference in crystal structure determines that the austenitic cryogenic pipe has no brittle transition temperature in the low temperature range. Generally, it is not necessary to verify its low-temperature impact toughness. It is used, but GB150-2011 stipulates that when the operating temperature is not lower than -196 ℃ (low temperature range), the impact test can be exemp...