Incoloy Alloy 800ht Hexagon Bolts Fastener, DIN912

Incoloy800HT is a fully austenitic, low carbon, nickel-iron-chromium alloy of the same series as Incoloy 800. The cobalt content of this alloy can be controlled below 0.01%. Incoloy 800HT is resistant to many corrosive media. Its high nickel content makes it have good resistance to stress corrosion cracking in aqueous corrosion conditions. High chromium content makes it more resistant to pitting and crevice corrosion cracking. The alloy has good resistance to nitric acid, organic acid corrosion, but in sulfuric acid and hydrochloric acid corrosion resistance is limited. Except for the possibility of pitting corrosion in halides, there is good corrosion resistance in oxidizing and non-oxidizing salts. In water, steam and steam, air, carbon dioxide mixture also has good corrosion resistance. Used in nitric acid condensers - nitric acid corrosion resistant, steam heated tubes - very good mechanical properties, heating element tubes - very good mechanical properties etc. For applications up to 500 ° C, the alloy is annealed.
Incoloy 800HT Similar Grades:
Material Grade: Incoloy800HT (N08811)
German grade: W.Nr.1.4876
DIN grade: X10NiCrAlTi3220
French brand: Z8NC32.21
British brand: NA15
American brand: UNS N08811
ISO grade: FeNi32Cr21AlTi
Incoloy800HT has the following features:
Excellent corrosion resistance in very hot aqueous media up to 500 ° C
Good resistance to stress corrosion properties
very good processability
Incoloy800HT Physical Properties:
Density: ρ = 8.0g / cm3
Melting temperature range: 1350 ~ 1400 ºC
Tensile strength Rm N / mm2: ≥585
Yield strength RP1.0 N / mm2: ≥265
Elongation A%: ≥30%
Incoloy800HT Conditional Stress: High-stress values of up to 90% yield strength can be applied to applications that allow slightly larger deformations. These stress-induced permanent stresses can cause dimensional changes and are therefore not recommended for flange and ferrule fittings.
Incoloy800HT metallographic structure: Incoloy800HT alloy has a stable face-centered cubic structure. Chemical composition and proper heat treatment ensure that the corrosion resistance is not impaired by the sensitization.
Incoloy800HT Corrosion Resistance: Incoloy800HT is a versatile engineering alloy with both acid and alkali corrosion resistance in oxidizing and reducing environments. The high nickel content of the alloy has an effective stress corrosion cracking resistance. Corrosion resistance in all media is good, such as sulfuric acid, phosphoric acid, nitric acid and organic acids, alkali metals such as sodium hydroxide, potassium hydroxide and hydrochloric acid solutions. Incoloy800HT higher overall performance in a corrosive media, a variety of nuclear combustion dissolver, such as sulfuric acid, nitric acid and sodium hydroxide are handled in the same equipment.
Incoloy800HT/W.Nr1.4876/N08811 Application:
Incoloy800HT is widely used in a variety of industrial use temperature does not exceed 550 ºC. Typical applications are:
sulfuric acid pickling factory with heating pipes, containers, baskets and chains.sea water cooling heat exchanger, marine product pipeline system, acid gas environment pipeline.
heat exchanger in the production of phosphoric acid, evaporator, washing, dipping tube and so on.
Air-to-air heat exchanger in petroleum refining
food engineering
chemical process
High-pressure oxygen application of flame-retardant alloys.
Incoloy800H processing methods and heat treatment:
Incoloy 800HT is suitable for hot and cold work, but requires high-power processing equipment due to its high strength.
Incoloy800HT Heating:
1. The workpiece should be kept clean before and during the heat treatment.
2. Do not touch sulfur, phosphorus, lead and other low melting point metal during heat treatment, otherwise it will damage the performance of the material. Care should be taken to remove such contaminants as marking paint, temperature indicating paint, colored crayons, lubricating oil and fuel.
3. The lower the sulfur content of the fuel the better, the sulfur content of natural gas should be less than 0.1%, the sulfur content of heavy oil should be less than 0.5%.
4. Considering the need for temperature control and maintenance, it is best to heat-treat in a vacuum furnace or gas-fired furnace.
5. Can also be heated in a box furnace or gas furnace, but the furnace gas must be clean and neutral to micro-oxidation is appropriate, should avoid fluctuations in furnace gas oxidation and reduction, the heating flame can not be directly burned Workpiece.
Incoloy800HT thermal processing:
1. Incoloy 800HT thermal processing temperature range of 1200 ºC ~ 900 ºC, the cooling mode is water quenching or between 760 ºC ~ 540 ºC as fast as possible cooling. Thermal bending should be between 1150 ºC -1000 ºC.
2. For best corrosion resistance and creep resistance, anneal after hot working.
3. Material can be directly fed into the furnace has been warmed to 1200 ºC, the material holding time per 100mm thickness insulation 60 minutes. Insulation enough time quickly released, in the specified temperature range for thermal processing. When the material temperature dropped below the heat processing temperature, the need to reheat
Incoloy800HT cold processing:
1.Incoloy 800HT hardenability than the austenitic stainless steel, so the need for processing equipment selection. Cold working materials should be annealed and heat treated, and should be subjected to intermediate annealing during cold working.
2. If the cold working capacity is more than 10%, soften and anneal the workpiece before use.
Incoloy800HT heat treatment:
1.Incoloy 800HT softening annealing temperature range is 920 ºC ~ 980 ºC, the best processing temperature is 950 ºC.
2. In order to get the best corrosion resistance, the cooling method adopts water quenching, the material with the thickness of less than 1.5mm can also adopt the fast air cooling.
3. In the heat treatment process, should be in accordance with the aforementioned heating process must be kept clean operation.
Incoloy800HT descaling and pickling:
1. Incoloy 800HT's surface oxide and weld around the welding slag adhesion stronger than stainless steel, mechanical and chemical methods can be used, the choice of mechanical methods to avoid metal contamination or surface deformation methods.
2. Prior to pickling with HNO3 / HF mixed acid, the oxide film must be carefully sharpened or salt bath pre-treated.
Incoloy800HT Machining:
The Incoloy 800HT has to be machined after annealing and heat treatment. Due to the work hardening of the material, the Incoloy 800HT should be machined at a lower cutting speed and heavy feed than standard low-alloy austenitic stainless steels before being hardened .
Incoloy800HT welding:
Incoloy 800HT is suitable for welding with any traditional welding process, such as tungsten inert gas welding, plasma arc welding, manual sub-arc welding, metal inert gas welding, melting inert gas welding, gas arc welding, etc., in which the pulse arc Welding is the preferred solution. Incoloy 800HT welding must be carried out in the annealed state, and clean up stains, dust and a variety of signs. Low heat input, interlayer temperature does not exceed 150 ºC. No need to heat before welding or after welding. When using manual arc welding, it is recommended to use (Ar + He + H2 + CO2) a variety of ingredients mixed protective gas.
Mr. Zhu  Sales Manager

Special fasteners, standard fasteners production and sales / technical support, customer service

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