Heavy duty bar grating as known as heavy duty steel grating, heavy load steel grating or heavy load bar grating, is made of ordinary carbon flat steel, stainless steel in certain sizes through slotting (tapping), grafting and locking, welding, finishing and other processes. It is widely applied to civil and commercial buildings, theaters, subways, urban railways and other municipal engineering fields, and it can be used to airports, highways, industrial platforms, ports, docks and other platforms with special requirements on load-bearing.