Q355NH material is a welded weather-resistant steel plate with a yield point of 355 MPa. The biggest advantage of this steel plate is its good welding performance and strong atmospheric corrosion resistance. Q355GNHD steel is a high-strength weathering steel selected for High-Speed Train carriages. The biggest difference is the difference in strength. GNH is the first letter of Pinyin for "high weather resistance", and D is grade, indicating the requirement for low temperature impact toughness.
Q355 series of high weather resistance structural steel plates include 09CuPCrNi, Q345GNHL, SPA-H, Q355NH,
Q355GNH and other steel grades. This type of steel is alloyed with Cu, P, Cr, Ni, etc. to form a protective layer on the surface of the metal substrate, thus having a high The atmospheric corrosion resistance performance. The weather resistance of this kind of steel is better than that of welded structure, so it is called high weather resistance structural steel. This type of steel is widely used in railway vehicles, various weather-resistant building structures (especially used in industrial atmospheric environments), bridge auxiliary structures, etc.
