The main characteristics of the mechanical properties of a good editor q620d factory outlets, weldability, cold, heat processing performance and corrosion resistance are good q620d shelf, C, D, E grade steel has good low-temperature toughness. 5 Application examples editor ships, boilers, pressure vessels, oil storage tanks, bridges, power station equipment, material handling equipment and other welded structure of high load. Q345 is a steel material. It is a low-alloy steel q620d mechanical properties, widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment. "Q" means the yield strength, Q345 indicates that the steel yield strength of 345MPa. Q345 will increase the thickness of the material of its yield value decreases. And it may be smaller domestic high-strength steel in 345, so when the mechanical design strength must be less than 345 this value, otherwise there will be problems. Reference Standard: GB / T1591-2008 "low alloy high strength structural steel" q620d chemical composition, q620d, Suzhou, Suzhou, the same is provided by the same metal material Limited. Suzhou, with Metal Materials Co. (www.szrtjs.com) located in Wuzhong District, Suzhou City Pu Town and Xi Road No. 1238 (Puyang intersection). Scraps and development in the wave of market economy, the current Suzhou, with has a high profile in the metal building, and enjoys a good reputation. Suzhou, get the whole network business alliance with certification, marking our service and management level has reached a new height. Suzhou, with the staff willing to work with all people of insight and common development, for a better future.