Dual-phase Stainless steel, abbreviated as DSS, has been developed into the third generation since its birth in the United States in the 1940s. Its main feature is that the yield strength can reach 400-550MPa, which is twice as much as ordinary stainless steel, so it can save material and reduce equipment manufacturing costs. In terms of corrosion resistance, especially the media environment is relatively harsh (such as seawater, high chloride ion content) conditions, duplex stainless steel resistance to pitting, crevice corrosion, stress corrosion and corrosion fatigue performance is significantly better than ordinary austenitic stainless steel, can be comparable to high-alloy austenitic stainless steel.

Compared with 316L and 317L austenitic stainless steels, duplex 2205 alloy has superior performance in terms of resistance to pitting and crevice corrosion, it has high corrosion resistance, lower coefficient of thermal expansion and higher thermal conductivity compared to austenitic.
Duplex 2205 alloy has twice the compressive strength compared to austenitic stainless steels and allows designers to reduce its weight compared to 316L and 317L. 2205 alloy is particularly suitable for use in the -50°F/+600°F temperature range, and can be used at lower temperatures under severe restrictions (especially for welded structures).

Alloy 2507 is composed of 25% chromium, 7% nickel and 4% molybdenum. It has high strength and corrosion resistance and is mainly used in chemical processing, petrochemical and subsea equipment; it has strong resistance to chloride corrosion, high thermal conductivity and low coefficient of thermal expansion. The higher chromium, molybdenum and nitrogen content makes it highly resistant to spot corrosion, crevice corrosion and general corrosion.