GB/T 16270 is managed by (Standardization Administration of China). The latest active version is GB/T 16270-2009 (superseding earlier 1996 edition). Authorized PDFs can be obtained from:
Unlike regular structural steel, GB/T 16270 steels are (Q+T). The PDF specifies that the steel must be heat-treated after rolling to achieve a martensitic or bainitic microstructure. gb t 16270 pdf
If you are comparing this to international standards, is roughly equivalent to: GB/T 16270 is managed by (Standardization Administration of