Vessels, boilers, pressure vessels, oil storage tanks, bridges, power plant equipment, lifting transport machinery and other high load welded structure Q345E seamless pipe old standard controls: 18Nb containing Nb killed steel, performance with 14MnNb of, similar, mainly used good atmospheric corrosion of steel, cranes, blower, chemical machinery 09MnCuPTi of resistance and low temperature impact toughness, weldability, hot and cold workability are mainly used in wet and humid areas and various corrosive atmosphere temperature of mechanical 12MnV work - 70 degree low temperature steel, mainly used in refrigeration machinery, low temperature work the structural parts 14MnNb performance similar 18Nb steel, mainly used Operating Temperature -20 - 450 degrees container and other structural parts 16Mn good mechanical properties, low temperature performance , the performance of the cold stamping, welding performance and cutting performance is good, mainly used in mining, transportation, chemical mechanical 16MnRE performance 16Mn steel similar impact toughness and cold bending performance is better than 16Mn, uses the same 16Mn steel