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What Are The Characteristics Of Duplex Stainless Steel?

Dec. 29, 2018

The Duplex Stainless Steel contains about 50% to 60% austenite and 50% to 40% ferrite structure after normal solution treatment (heating at 1020 ° C to 1100 ° C and water cooling). As the heating temperature increases, the two comparative examples do not change significantly.

Duplex stainless steel has good low temperature impact toughness. For example, a transverse specimen with a thickness of 20 mm can absorb more than 100 J at -80 °C. In most media, its uniform corrosion resistance and pitting resistance are good, but it should be noted that when the steel is heat treated below 950 °C, its stress corrosion resistance will deteriorate significantly due to the precipitation of σ phase. Since the ratio of the Cr equivalent to the Ni equivalent of the steel is appropriate, a large amount of primary austenite structure remains after heating at a high temperature, and the secondary austenite is formed during the cooling process, and the total austenite phase in the steel is obtained. Not less than 30% to 40% thus gives the steel a good resistance to intergranular corrosion.

In addition, as mentioned earlier, the crack tends to be low when welding such steel, without preheating and post-weld heat treatment. Since the base material contains a high N, the weld near seam area does not form a single-phase ferrite region, and the austenite content is generally not less than 30%. Suitable welding methods include tungsten argon arc welding and electrode arc welding. Generally, in order to prevent grain coarsening in the near-slit area, low-line energy welding should be used when welding. Our Duplex Stainless Steel Wire Mesh meets national standards and can be contacted if you would like more detailed information.

Duplex Stainless Steel Wire Mesh

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