Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality stainless steel seamless tubes and nickel-nickel alloys. Now let’s introduce ferritic stainless steel seamless pipe and tube.
The ferrite grain boundaries are smooth, twin crystals or slip lines are rarely seen in the grains, the color is light green, shiny, and dark after deep corrosion. Ferrite in steel exists in flakes, blocks, needles and nets.
This part of ferrite is called proeutectoid ferrite or free ferrite in the structure. Depending on the formation conditions, proeutectoid ferrite has different morphologies, such as equiaxed, crystalline, spindle, zigzag, and needle-like. Ferrite is also the matrix of pearlite structure. In the hot-rolled (normalized) and annealed structures of carbon steel and low-alloy steel, ferrite is the main component phase; the composition and structure of ferrite have an important influence on the process performance of steel. The performance also has an impact.
Carbon dissolves into δ-Fe to form interstitial solid solution, which has a body-centered cubic lattice structure. Because of the higher temperature, it is called high-temperature ferrite or δ solid solution. It is expressed by δ and exists above 1394℃.
The maximum amount of dissolved carbon is at 1495℃. The mass fraction of carbon is 0.09%.
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