Problems of ASTM A588 Grade C Weathering Steel During Hot Rolling

In recent years, ASTM A588 Grade C weathering steel has been paid attention to and has been popularized and applied. Since Cu has an obvious effect on improving the atmospheric corrosion resistance of ASTM A588 Grade C weathering steel, Cu is added to general weathering steel, especially economical weathering steel. As mentioned above, the production process of ASTM A588 Grade C weathering steel has also received a lot of attention because Cu in ASTM A588 Grade C weathering steel can cause hot embrittlement of the steel.

In the actual production heating and heat preservation process, what kind of segregation or precipitation phenomenon of Cu in ASTM A588 Grade C weathering steel occurs, and how it affects the hot embrittlement of ASTM A588 Grade C weathering steel, is very worthy of attention.

During the hot rolling process, the corners of ASTM A588 Grade C weathering steel have the largest deformation and the largest residual stress, and the corners of ASTM A588 Grade C weathering steel are cooled first, and the cooling rate is faster than other parts, so it is difficult to pass Recrystallization completely releases the residual stress.

In this case, ASTM A588 Grade C weathering steel is more prone to cracking when there is an incentive for cracking at the corners, which affects the final quality. The cracking problem of ASTM A588 Grade C weathering steel is not only affected by factors such as stress, deformation, cooling rate, etc., but also by the enrichment of Cu and other factors during the hot rolling process.