Inconel 686

The Inconel 686  alloy is an alloy of nickel - chromium iron based solid solution, has good  corrosion resistance and oxidation resistance, excellent cold and heat  processing and welding process performance. Below 700℃ are  satisfactory thermal and high plasticity. Alloys can be hardened by cold  processing, it can also be connected by resistance welding, welding or brazing.

Inconel 686 supply specification: round steel, bar, strip, tubular product, sphere, flange, forge  piece.

Product Description

Inconel 686 characteristics:

• Good corrosion resistance, oxidation and nitride dielectric  corrosion.

• Good stress corrosion cracking resistance at room temperature and  high temperature.

• Good corrosion resistance of chlorine and hydrogen chloride.

• Good mechanical properties in sub-zero temperature, room temperature  and high temperature.

• Good creep rupture strength (recommend in over 700℃ atmosphere)

Inconel 686 Corrosion resistance：

• All corrosive medium, better corrosion resistance than alloy 200 and  alloy201(contain carbon) in oxidizing condition.

• Reduction conditions and basic solutions. Effectively prevent the  chloride stress corrosion cracking.

• Good corrosion resistance in acetic acid, acetic acid, formic acid,  stearic acid and other organic acids, medium corrosion resistance in mineral  acid.

• A high purity water used in a nuclear reactor and a secondary cycle.

• Resist the corrosion of dry chlorine and hydrogen chloride,  application up to 650 ℃.

• In high temperature, annealing and solid solution treatment states  of the alloy in air has the very good antioxidant performance and high peeling  strength.

• The alloy can resist ammonia gas and nitriding and carburizing  atmosphere, but in the alternation of oxidation and reduction conditions, the  alloy will be corroded by partial oxidation medium. (Such as green death fluid)

Inconel 686 Process Performance and Requirements:

• Hot working

• Thermal processing temperature  range 1200℃~900℃, the cooling method is water quenching or rapid air cooling.

• The best corrosion resistance  and optimum crystal structure are obtained, and heat treatment is required  after heat processing.

• The material can be fed  directly into the heated furnace.

• Cold working

• Cold  working materials should be annealed or solid solution heat treatment. The process  hardening rate of 686 alloy is close to that of austenitic stainless steel, so  it can choose similar processing equipment.

• In the  process of cold processing, intermediate annealing should be carried out.

• When  the cold processing volume is greater than 5%, the work piece should be treated  with solid solution.

• In  order to reduce the wear and tear of the material, the die should choose alloy  tool steel, hard alloy or cast steel.

• Welding technology

Alloy welding performance is good, can be connected  through arc welding, argon arc welding, resistance welding and brazing of  various methods, large or complex welding structure after welding should be annealing  for 1h at 870℃, to eliminate the welding stress.

• Part heat treatment process

The heat  treatment process of the parts shall be carried out according to the  corresponding material standard heat treatment system. Annealing treatment of  sheet and strip parts should be carried out in a protective atmosphere.

Product Application

Inconel 686 Application：

• The thermocouple sleeve in the  corrosive atmosphere.

• Vinyl chloride monomer production:  Anti - chlorine, hydrogen chloride, oxidation and carbonation corrosion.

• Uranium oxidation is converted  to hexafluoride: Anti - fluoride corrosion.

• The production and use of  caustic alkali metals, especially in the use of sulfide.

• Use chlorine dioxide to make  titanium dioxide.

• Organic or inorganic chloride  and fluoride production: Anti-chlorine and fluorine corrosion.

• Nuclear reactor.

• The bending bottleneck and  components in the heat treatment furnace, especially in the atmosphere of  carbonization and nitriding.

• The catalytic regenerator in  petrochemical production is recommended to use alloy 686 for longer use in  applications over 700℃.

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