Flange, valve, fitting made of stainless steel Incoloy 825
Incoloy 825 has a high impact hardness at room temperature. It keeps a lasting-quality at cryogenic temperatures. Alloy can be cold-worked and hot-worked. A hot working should be done at +870 — 1180 ° C and should be finished at 870 — 980 °C. Details that are obtained with a hot deformation must undergo a stabilizing annealing before using for providing a maximum of corrosion resistance.
|38−46||0,05||19,5−23.5||0,5||0,03||1,0||1,5−3.0||2,5−3.5||22 minutes||max 0.2||0,6−1.2|
Valves, fittings, flange made of iron-chrome-nickel alloy Incoloy 825 are characterized by a high resistance to corrosion cracking. Alloy is stabilized with titanium and additives of molybdenum and copper. It gives a perfect resistance to effect of aggressive environments including sea water in chemical industry. The only demerit of alloy is its relatively high content (22%) of iron that makes it less resistant to effect of alkaline corrosion. Forged flanges are used in high-pressure vessel, air manifolds, heat-transfer devices. They are used in marine industries such as underwater marine system of oil production, industrial air buffers.
This alloy has a good workability. It can satisfactory be taken to molding. However, it is disposed to a hammering harden. That is why it must be cut at small speeds with a special tool. It differs with an excellent weldability by dint of well-balanced composition. Welding is done without further heat treating or previous heating.
|welding is done without further heat treating or previous heating|
|hardly weldable||in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, to do a heat treating (annealing) after welding|
|limitedly weldable||welding is possible at heating to 100−120°С and last heat treating|
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