Two-phase steel welding AC
Thread Content
Seeking advice: What aspects should be taken into consideration regarding the welding and use of duplex steel?
What is duplex steel! I don’t understand. Please explain
Reply to 2# Teacher Hu: So-called duplex stainless steel has a solid solution structure in which the ferrite phase and the austenite phase each make up half of it; generally, the content of either phase should also reach 30%. At low C levels, the Cr content ranges from 18% to 28%, while the Ni content ranges from 3% to 10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N. This type of steel possesses the characteristics of both austenitic and ferritic stainless steels. Compared to ferritic steels, it has higher plasticity and toughness, no room-temperature brittleness, and significantly improved resistance to intergranular corrosion as well as weldability. At the same time, it retains the 475°C brittleness and high thermal conductivity associated with ferritic stainless steels, as well as superplasticity. Compared to austenitic stainless steels, it has higher strength, as well as significantly improved resistance to intergranular corrosion and chloride stress corrosion. Duplex stainless steel exhibits excellent pitting resistance and is also a nickel-saving stainless steel.