Knowledge

Unlike the weld zone, the ω (N) of the heat affected zone will not change during welding, which is the ω (N) of the base material, so the main factor affecting the structure and pe

Gomez de Salazar JM et al. investigated the effect of different N2 content in the protective gas on the properties of duplex stainless steel.

After the normal solid solution treatment (1020℃ ~ 1100℃ heating and water cooling), the steel contains about 50% ~ 60% austenite and 50% ~ 40% ferrite structure.

There are many kinds of stainless steel with different properties, and it has gradually formed several categories in the development process.

The first type is a low-alloy type, representing the grade UNS S32304 (23Cr-4Ni-0.1N), the steel does not contain molybdenum, the PREN value is 24-25, and can be used instead of AI

Duplex stainless steel has the characteristics of austenitic stainless steel and ferritic stainless steel because of its austenitic + ferritic biphase structure, and the content of

Combined with chloride stress corrosion properties, it is these superior properties that make duplex stainless steel develop rapidly as a weldable structural material, and since th

Since the birth of duplex stainless steel in the United States in the 1940s, it has developed to the third generation.

Duplex Stainless Steel (Duplex Stainless Steel, referred to as DSS), refers to ferrite and austenite each accounted for about 50%, generally less phase content also needs to reach

Heat treatment industry. Such as furnace rollers, bell furnaces, and annealing furnaces.

Nickel-based superalloy. The main alloying elements are chromium, tungsten, molybdenum, cobalt, aluminum, titanium, boron, zirconium and so on.

There are two categories of added alloying elements: one is the solid solution strengthening element that can form a solid solution with nickel, such as copper, cobalt, iron, chrom