Alloy 600 / UNS N06600


Alloy 600 is a nickel-chromium-iron, solid solution strengthened alloy used for applications that require corrosion and elevated temperature resistance. Service temperatures for alloy 600 can be from cryogenic to 2000°F. This alloy also has good workability, weldability and high strength.

Industries and Applications

The unique properties of alloy 600 make it useful in various applications across several industries. Chemical process industry applications include heaters, condensers and trays. Heat-treat industry applications include muffles, retorts, baskets and other furnace fixtures. Aerospace industry applications include exhaust liners, turbine seals and air-frame components. Alloy 600 is also used in the nuclear industry because of its resistance to corrosion in high purity water.

Resistance to Corrosion

With 72% minimum nickel, this alloy is resistant to many organic and inorganic compounds and also offers good corrosion resistance in reducing conditions. The high nickel content lowers the chances for stress corrosion cracking for this alloy in the annealed condition. The high nickel content also improves resistance to carburizing, nitriding and thermal fatigue, while maintaining an austenitic structure so it retains ductility. Increased chromium in the alloy offers high temperature resistance to sulfur compounds as well as resistance to oxidizing compounds at elevated temperatures or in corrosive media. Alloy 600 has excellent resistance to alkalies and is one of the few materials suitable for use in strong solutions of magnesium chloride at elevated temperatures. Typical corrosion in MgCl₂ is roughly 1 mpy. When applicable, material for severe service should be fully stress relieved prior to use.

Fabrication and Heat Treatment

Alloy 600 can be hot or cold formed using typical processes. Hot working should be performed between 1600°F and 2250°F, avoiding any work between 1200°F and 1600°F as the ductility decreases in this temperature range. The cold work hardening rate is less than 304 stainless steel yet higher than mild steel. Welding alloy 600 can be achieved via shielded metal-arc welding using AWS ENiCrFe-3 electrode. Filler metal AWS ERNiCr-3 can be used when TIG and MIG welding. Alloy 600 is slightly more machinable compared to 304 stainless steel and should be performed with tooling large enough to handle the loads. Alloy 600 machining requires heavy-duty equipment along with sharp tooling and proper cutting fluids. Annealing of alloy 600 without excessive grain growth can be performed at 1850°F for 15 minutes at temperature. Fine grain material typically has better corrosion resistance and higher tensile, fatigue and impact properties.

Common Trade Names

INCONEL® alloy 600

INCONEL® is a registered trademark of the Special Metals Corporation group of companies.

Chemical Composition (%)

Nickel + Cobalt Chromium Iron Manganese
72.0 min 14.0-17.0 6.00 to 10.00 1.00 max
Silicon Copper Carbon Sulfur
0.50 max 0.50 max 0.15 max 0.015 max

1Includes Co

Applicable Specifications

Form1 ASTM ASME Other
Bar B166, B5642 SB166, SB5642 AMS 56653
Seamless Tube & Pipe B167 SB167 -
Welded Tube B516 SB516 -
Welded Pipe4 B517 SB517 -

1All Material to be supplied in the annealed condition. 2Dual certified to ASTM B564 & ASME SB564 for product 3.500" diameter and larger. 3Chemistry only. 4All welded pipe ≥6.000" X-Ray inspected per ASME Section VIII, Division 1, #UW-51.

Standard Products

Alloy 600 Plate

Alloy 600 Fittings

Alloy 600 Tube

Alloy 600 Pipe

Alloy 600  Bar

Alloy 600 Sheet

Alloy 600 Fasteners

Alloy 600 Flanges

Nickel Alloy Flanges

Alloy 600 Welding Product

Alloy 600 Coil

Alloy 600 Plate Shapes

Alloy 600 Custom Profiles

Alloy 600 Forgings

Alloy 600 Machined Parts

Alloy 600 Welded Components