GB Q345R Steel Plate

Overview of GB Q345R Steel Plate

GB Q345R is the foundational steel grade for boilers and pressure vessels in the Chinese industrial standard GB 713. The “Q” denotes Yield Strength, “345” represents the minimum yield strength of 345 MPa, and “R” signifies its specialized certification for Pressure Vessels (Rongqi). This carbon-manganese-silicon alloy is engineered to deliver a critical balance of high tensile strength, superior notch toughness, and exceptional weldability, making it the primary choice for safety-critical pressurized components.

Shandong Tanglu Metal Material Co., Ltd. supplies premium GB Q345R plates that undergo rigorous quality inspections to withstand extreme internal pressures and thermal cycling. Whether utilized in large-scale industrial steam drums or complex refinery reactors, our Q345R plates provide the structural reliability required by international engineering benchmarks. Every plate is delivered with 100% traceability and original Mill Test Certificates (MTC) to guarantee project compliance.

Key Features and Engineering Advantages

The primary engineering advantage of GB Q345R lies in its optimized grain structure and balanced chemistry. It exhibits superior resistance to brittle fracture across a wide temperature spectrum. Furthermore, with a controlled carbon equivalent (CEV), Q345R demonstrates excellent weldability, reducing the risk of cold cracking during heavy-section fabrication. For projects in sour service environments, we offer Q345R with HIC (Hydrogen-Induced Cracking) and SSC testing to ensure maximum safety.

In fabrication, GB Q345R is highly responsive to modern CNC processing. It maintains excellent formability during the rolling of vessel shells and the pressing of dished heads. The material’s high purity and low sulfur/phosphorus content ensure consistent results during high-integrity welding. By choosing Tanglu’s Q345R, project managers benefit from a mature, high-performance material that simplifies fabrication complexity while ensuring the long-term operational safety of pressure equipment.

Main Applications of GB Q345R

GB Q345R is extensively utilized in the energy, petrochemical, and chemical processing sectors. Its most common application is in the manufacturing of high-pressure industrial boilers and heat exchangers. In the oil and gas industry, it is essential for the fabrication of spherical gas holders, crude oil storage tanks, and various separator vessels.

Beyond petrochemicals, Q345R is widely used in power plant construction for high-pressure steam piping and accumulator tanks. Its proven reliability also makes it a preferred choice for the transport of liquefied gases and other hazardous pressurized materials. Due to its cost-effective performance and high safety margins, GB Q345R remains the global standard for carbon steel pressure vessel plates.