Unlike regular structural steel, GB/T 16270 steels are quenched and tempered (Q+T). The PDF specifies that the steel must be heat-treated after rolling to achieve a martensitic or bainitic microstructure.
Note: The suffix letters (D, E) denote impact test temperatures: D = -20°C, E = -40°C. gb t 16270 pdf
For high-strength steels, weldability is a primary concern. The PDF stipulates maximum limits for: Unlike regular structural steel, GB/T 16270 steels are
