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Place of Origin
HS-CODE
75-
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Detailed Description
Incoloy 800HT（UNS NO8811）
Features and applications overview:
The alloy is resistant to many corrosive media. Its higher nickel content makes it has a good resistance to stress corrosion cracking in aqueous corrosion conditions. It has better resistance to pitting corrosion and crevice corrosion cracking because of the high chromium content. The alloy has good resistance to nitric acid, organic acid corrosion, but limited corrosion resistance to sulfur acid and hydrochloric acid. The alloy has good corrosion resistance in oxidizing and non-oxidizing salts except slight corrosion occurs in halides. Also it has good corrosion resistance in a mixture of water, smoke, steam, air and carbon dioxide. The alloy is applied to the condenser nitrate, nitric acid corrosion resistance, steam heating pipe and the heating element tube.
Incoloy800HT's similar grade:
W.Nr.1.4958(Germany)
chemical composition, %
Nickel........................................30.0-35.0
Chromium..................................19.0-23.0
Iron.............................................39.5 max
Carbon........................................0.06-0.1
Manganese..................................1.5 max
Silicon..........................................1.0 max
Sulfur...........................................0.015 max
Copper..........................................0.75 max
Aluminium....................................0.15-0.60
Titanium........................................0.15-0.60
physical properties:
Density, g/cm3 ......................................................................................8.0
Melting Range, °C................................................................................1350-1400
Thermal conductivity, λ/(W/m•°C), at 100°C .....................................11.6
Specific heat, J/kg•°C............................................................................455
Elastic modulus, GPa.............................................................................198
Electrical resistivity, μΩ•m....................................................................0.98
Coefficient of linear expansion, a/10-6°C-1, at 20-100°C.............14.4
mechanical properties:(the minimum value detected at room temperature)
Tensile strength, σb/MPa.....................................450
Yield strength,σp0.2/MPa...............................180
Elongation,σ5 /%...................................................................35
The way of heat treatment is solution treatment
Available products and specifications:
Bar: ASTM B408, AMS 5766, ASME SB408
Forging: ASTM B564, ASME SB564
Plate/Strip: ASTM B409, AMS 5871, ASME SB409
Pipe: ASTM B407, ASTM B163, ASTM B514, ASTM B515, ASME SB407, ASME SB163, ASME SB514, ASME SB515.
The metallurgical structure of Incoloy 800HT:
Incoloy 800HT is of the face-centered cubic lattice structure. Very low carbon content and improved ratio of Ti:C enhance the stability of the structure and allergy resistance as well as resistance to intergranular corrosion. The low temperature annealing around 950°C ensures the fine grain structure.
The process performance and requirements of Incoloy 800HT:
1, The alloy is suitable for both hot processing and cold processing. However, due to having a high strength, it requires high- power processing equipment.
2, The thermal processing range of the alloy is 1200°C-900°C. The cooling method is water quenching or rapid cooling 760-540°C. Thermal bending is conducted between 1000 to 1150°C.
3, Incoloy alloy 825HT has good weldability by all conventional processes, such as tungsten electrode inert gas welding, plasma arc welding, hand-sub-arc welding, metal inert gas welding, metal inert gas shielded arc welding, protective gas arc welding, and so on.
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