This 300bar high-pressure seamless steel cylinder is made of high-strength alloy steel 34CrMo4. It is mainly used for storing and transporting high-pressure industrial gases and fire-fighting gases, such as nitrogen, argon, carbon dioxide, IG541 inert gas, and other clean fire-extinguishing media. It is widely applied in industrial production, gas storage and transportation, pipeline pressure testing, and fixed fire protection systems in buildings, data centers, and power facilities. The product meets ISO 9809-1 and EN standards, with high strength, good airtightness, stable performance, and long service life, ensuring safe and reliable gas storage in harsh working environments.