A study on the dual-phase treatment of weathering steel 09CuPCrNi

摘要

Dual-phase treatment processes, the resultant microstructures and the corresponding mechanical behavior and properties of weathering steel 09CuPCrNi have been studied. The results show that the microstructures of weathering steel 09CuPCrNi after intercritical quenching are characterized by an irregular distribution of island-shaped martensite in the matrix of equiaxed ferrite grains. Favorable mechanical properties and cold formability can be obtained through the intercritical quenching at 780 deg C. The dual-phase-treated steel is superior in weldability to the as-received hot-rolled steel and its atmospheric corrosion resistance is better than that of the original.