HP345 steel under the GB6653 standard is a type of steel specifically used for welded gas cylinders.
Chemical Composition: HP345 steel belongs to the category of low-carbon manganese steel. Its main chemical components include carbon (C), silicon (Si), and manganese (Mn), and it may also contain trace amounts of vanadium (V) and titanium (Ti) for composite microalloying. The specific ranges of chemical composition may vary slightly, but they usually meet certain standards, such as a carbon content between 0.17% and 0.25%, with silicon and manganese contents also controlled within certain ranges.
Mechanical Properties: HP345 steel exhibits high yield strength and tensile strength while maintaining good plasticity and toughness. Its yield strength is not less than 345 MPa, and its tensile strength ranges from 510 to 620 MPa, with an elongation after fracture of not less than 17%. These properties make HP345 steel highly suitable for manufacturing gas cylinders that need to withstand high pressure.
Processing Properties: HP345 steel possesses excellent welding and forming properties, which make it easy to process and shape during manufacturing while ensuring the quality and strength of welded joints.
HP345 steel is primarily used for manufacturing liquefied petroleum gas cylinders, acetylene cylinders, and other low-pressure steel welded gas cylinders. These cylinders need to withstand a certain internal pressure, thus requiring the base material to have high yield strength and tensile strength, as well as good plasticity, toughness, and forming properties to ensure the safety and reliability of the cylinders. These performance characteristics of HP345 steel make it an ideal material for manufacturing such cylinders.
Furthermore, with the increasing popularity of environmentally friendly vehicles and civilian liquefied petroleum gas, the demand for liquefied gas cylinders is gradually increasing, and the application prospects for HP345 steel are becoming broader and broader.
