Q345R, specified under Chinese standard GB 713, has earned its position as the most widely used pressure vessel steel in China through a compelling blend of performance, versatility, and cost-efficiency. This low-alloy steel delivers a yield strength of 345 MPa for thicknesses up to 16mm, with tensile strength ranging from 470–640 MPa—meeting the rigorous demands of boiler and pressure vessel construction.
Several key attributes drive its widespread adoption. Q345R offers excellent comprehensive mechanical properties and processability, with lower phosphorus and sulfur content than standard Q345 steel to ensure superior impact toughness. Its low carbon equivalent and outstanding weldability support various fabrication processes including arc welding and gas-shielded welding, with weld strength matching the base metal. The material also demonstrates good low-temperature impact toughness and cold bending performance, facilitating the formation of complex structures.
The steel finds application across an extraordinary range of equipment: reactors, heat exchangers, separators, spherical tanks, LPG cylinders, boiler drums, and even nuclear reactor pressure vessels. Available in thicknesses up to 200mm and delivered in normalized condition, Q345R's performance is broadly equivalent to ASTM A516 Grade 70. This combination of properties, coupled with its established position in Chinese industrial standards, has made Q345R the default choice for boiler and pressure vessel fabrication throughout China's vast manufacturing sector.
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