il and gas pipes, pressure vessel pipes, and mechanical processing pipes, as well as the hs product series with independent intellectual property rights, and have achieved large-scale localization in the high-end field of steel pipes. oil and gas pipes are widely used in onshore and offshore oil and gas fields in various geological environments around the world. the highest steel grade for oil casing reaches hs155v, and the highest steel grade for line pipes reaches x100. pressure vessel pipes are widely used in thermal power, supercritical, ultra-supercritical units and nuclear power industries around the world. the highest steel grade reaches p92, with a high temperature resistance of 600°c and a pressure resistance of 30mpa. the low temperature pipe gr8 can withstand low temperatures up to –196°c. mechanical pipes are widely used in various machinery manufacturing companies and engineering construction industries around the world, and the product strength can reach up to 1000mpa.