Inconel® 686

INCONEL® 686 has outstanding resistance to general corrosion, pitting and crevice corrosion, and to stress corrosion cracking. It maintains corrosion resistance in weld beads and in the weld heat affected zone of welds. This alloy has good resistance to mixed acids with pH levels of 1 or less, and chloride levels of over 100,000 ppm.

Chemistry

 NiCrMoMnSiCSPTiWFe
MIN -- 19.0 15.0 -- -- -- -- -- 0.02 3.0 --
MAX balance 23.0 17.0 0.75 0.08 0.01 0.02 0.04 0.25 4.4 2.0

Specifications

ASME SB 564
ASME SB 574
ASME SB 575ASME SB 622ASME SB 775
ASTM A 480ASTM B 564
ASTM B 574
ASTM B 575
ASTM B 622
ASTM B 775
ASTM G 28 - A/BUNS N06686

Inventory

Inconel® 686 Pipe, Inconel® 686 Plate, Inconel® 686 Sheet

Common Trade Names

Nickel Alloy 686

Features

  • Exceptional resistance to sulfuric or hydrochloric acids, and mixed acids
  • Resists crevice corrosion in hot acid chlorides
  • Practical immunity to chloride stress corrosion cracking
  • Weldments retain high chloride pitting resistance

Applications

  • Chemical process vessels
  • FGD scrubbers
  • Pulp bleach plant washers
  • Waste management
  • Weld filler for other high-nickel corrosion alloys

Physical Properties

Density: 0.315 lb/inch3
Melting Point: 2440-2516°F
Electrical Resistivity: 744.4 Ohm - circ mil/ft

Temperature,°F 70 200 400 600 800 1000 1200
Young's Modulus x10-6, psi 30.0 29.7 28.5 28.0 26.9 26.0 24.6
Coefficient* of Thermal Expansion, in/in°F x 10-6 -- 6.67 6.81 7.00 7.17 7.25 7.49

* 70°F to indicated temperature.

Mechanical Properties

Minimum Tensile Data, Sheet and Plate

Temperature,°F 70
Ultimate Tensile Strength, ksi 100
0.2% Yield Strength, ksi 45
Elongation, % 45
Hardness, Rockwell B 100

INCONEL® and INCOLOY® are registered trademarks of Special Metals (PCC)