Chemical composition design of 09CuPCrNi-A weather-resistant steel plate

Reduce the corrosion rate of 09CuPCrNi-A weather-resistant steel plate; but Cu is easy to enrich on the surface of 09CuPCrNi-A weather-resistant steel plate, hot cracks will occur during rolling, and "copper embrittlement" occurs, and adding a small amount of Ni can effectively prevent "copper embrittlement" Phenomenon.

Cr can improve the passivation ability of 09CuPCrNi-A weather-resistant steel plate, form a dense oxide film on its surface, and slow down the growth rate of rust layer. When Cu and Cr are added at the same time, the effect is particularly significant.

S not only deteriorates the atmospheric corrosion resistance of 09CuPCrNi-A weathering steel, but also may cause "hot embrittlement" damage to 09CuPCrNi-A weather-resistant steel plate, and the sulfide inclusions seriously reduce the mechanical properties of 09CuPCrNi-A weather-resistant steel plate.

P can effectively improve the atmospheric corrosion resistance of 09CuPCrNi-A weather-resistant steel plate, but if the content of P is too high, it is easy to form segregation, resulting in "cold brittle" phenomenon, which affects the welding and low-temperature impact toughness of 09CuPCrNi-A weather-resistant steel plate. The elements P and S are strictly controlled, and the ultra-low P and S content design is adopted. According to the standard ASTM A588/A588M-2015, BBN produces qualified 09CuPCrNi-A weather-resistant steel plate.