C Quantitative test process to assess the learning level of C-language coding learners

摘要

The present invention relates to a hot forging method of 2507 class super duplex stainless steel used in parts requiring high corrosion resistance, such as ships, petrochemicals, and power generation facilities. The present invention, by weight%, C: 0.03% or less, Si: 0.8% or less, Mn: 1.2% or less, Ni: 6.0 to 8.0%, Cr: 24.0 to 26.0%, Mo: 3.0 to 5.0%, N: 0.24 After heating a stainless steel casting material having a ferrite-austenite abnormal structure composed of ~0.32%, remaining Fe and other unavoidable impurities to 1200~1250℃, hot forging at a forming rate of 3s -1 or less until cooled to 1150℃ It is characterized in that the hot forging press is performed at a molding speed of 2s -1 or less until it is cooled to 1100°C, and the hot forging press is performed at a molding speed of 1s -1 or less until it is cooled to 1050°C. According to the present invention, by efficiently pressing a 2507 class super duplex stainless steel cast material having a difficult-to-work property, molding defects can be minimized during hot forging and molded parts having an excellent microstructure can be manufactured.