The national standard for carbon structural steel plates in China is GB/T 3274, standard number GB/T 3274-2017. The standard specifies the chemical composition, mechanical properties, technical requirements and test methods of carbon and low-alloy structural steels and is applicable to the production and supply of hot-rolled steel plates and strips. The GB/T 3274-2017 standard covers a wide range of grades and thicknesses of carbon structural steel plates, including Q235, Q275, Q345 and more. Each grade has its own specific chemical composition requirements, mechanical property requirements and thickness range.

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