New Duplex Stainless Steel DP28W™ Contributes to Safe and Reliable Operation of Urea Plant

摘要

Toyo Engineering Corporation (TEC) and Sumitomo Metal Ind., Ltd. (SMI) have jointly developed new duplex stainless steel DP28W™ for urea plants. TEC have more than 30 years experience inrnapplying duplex stainless steels to a urea plant since 1970s. The biggest advantage of duplex stainlessrnsteel is its excellent passivation property in urea-carbamate solution, which enhances reliability ofrnequipment and enables to reduce injection of passivation air. In the meantime, duplex stainless steelrnhas some weakness in corrosion resistance in the heat affected zone (HAZ), which shows up in long-term operation. Therefore chemical composition, forming process and heat treatment etc should bernwell designed for duplex stainless steel DP28W™ was born as the best matching urea plant material based on all the feedbacks from long experience of TEC and SMI.