Duplex Stainless Steel

In recent years, high-performance steels have made great progress in the practical application of shipbuilding engineering. The strength, corrosion resistance, weldability, toughness and fatigue resistance of steels have made considerable progress. They have broad application prospects in the field of high-tech ships and marine engineering.

Duplex Stainless Steel (DSS) refers to the ferrite austenite each accounts for about 50%. The stainless steel with a minimum content of 30% is generally required for the less phase. It

Duplex stainless steel has been developed to the third generation since the birth of the United States. Its main feature is that the yield strength can reach 400-550 MPa, It is ordinary stainless steel twice, so it can save materials and reduce the cost of equipment manufacturing. In the aspect of corrosion resistance, especially in the bad medium environment (such as sea water, high chloride content), the resistance of duplex stainless steel to pitting corrosion, crevice corrosion, stress corrosion can be compared with high alloy austenitic stainless steel.

Duplex stainless steel has good weldability. Compared with ferritic stainless steel and austenitic stainless steel, duplex stainless steel is neither as sensitive to weld hot crack as ferritic stainless steel, nor as sensitive to weld hot crack as austenitic stainless steel.