Super alloy VLX800H is a slightly modified version of Incoloy 800 with the 800H grade possessing higher creep and rupture strength. This modification is possible because of the closely controlled carbon content and modified heat treatment.

The following sections will discuss in detail about super alloy VLX800H.

Chemical Composition

The chemical composition of super alloy VLX800H is outlined in the following table.

Element Content (%)
Nickel, Ni 30 - 35
Chromium, Cr 19 - 23
Manganese, Mn 1.5 max
Silicon, Si 1 max
Copper, Cu 0.75 max
Aluminum, Al 0.15 - 0.6
Titanium, Ti 0.15 - 0.6
Carbon, C 0.05 - 0.1
Sulfur, S 0.015 max
Iron, Fe Remainder

Physical Properties

The physical properties of super alloy VLX800H are tabulated below.

Properties Metric Imperial
Density 7.9 g/cm3 0.287 lb/in3
Melting point 1371°C 2500°F

Other Designations

Equivalent materials to super alloy VLX800H are provided below:

  • ASTM B163
  • ASTM B407
  • ASTM B408
  • ASTM B409
  • ASTM B514
  • ASTM B564
  • DIN 1.4876
  • DIN 1.4958

Fabrication and Heat Treatment


Super alloy VLX800H can be machined using the common processes applied to iron based alloys. This alloy does work-harden during machining and displays higher strength and "gumminess" unlike steels. It is recommended that heavy duty machining equipment and tooling should be used to reduce chatter or work-hardening of the alloy.

Any commercial coolants can be used during the machining operations; however water-based coolants are recommended for high-speed operations such as milling, turning, or grinding. Similarly, heavy lubricants are ideal for tapping, broaching, drilling, or boring.


Super alloy VLX800H can be formed using any of the conventional methods as it is very ductile. Powerful equipment is required to perform forming operations as this alloy is strong. It is recommended that heavy-duty lubricants be used while performing cold forming. It is important to clean all traces of lubricant after forming.


Welding of super alloy VLX800H can be performed using all the traditional welding methods. Matching alloy filler metal should be used. In case that is not available, it is advised that the nearest alloy closest to the chemical composition be used. The weld beads should be slightly convex, and preheating is not required. Surfaces to be welded have to be clean and free from oil, paint or crayon marking.


Forging should be performed in the temperature range of 1204-982°C (2200-1800°F).

Hot Working

Hot working can be performed in the temperature range of 1204-871°C (2200-1600°F).

Cold Working

Super alloy VLX800H can be cold formed using all the standard tools except for plain carbon tool steels as they produce galling.


Super alloy VLX800H can be annealed at 1176°C (2150°F) and then air cooled.


Super alloy VLX800H is used in the following application areas:

  • Piping for petrochemical plants
  • Heaters and heat exchangers that are used in prolonged high temperature environments.




Supply Form



Thickness?0.40-4.75mm?General Width?1000?1219?1500mm

Whole Coil or piece of it

Cold Annealed?Surface 2B?2E


Thickness?4.76-60mm?Width?1500?2000?2500mm?Length?3000?6000?8000?8500mm?Under 10mm plate can be coiled?

Whole Coil or piece of it

Single hot rolling?Solid solution annealed state?Surface 1D



Whole Coil or Specified size

Cold Annealed?Surface 2B?2E

Bar & Rod

Rolled barΦ5-45mm?Length≤1500mm

Polished Bar?circle?Square?

Solution annealing,descaling

Forged barΦ26-245mm?Length≤4000mm

Weld tube

Outer diameterΦ4.76-135mm?Wall Thickness0.25-4.00mm?Length?≤35000 mm

Base on your requirement

Use for PHE

Seamless Tube

Outer diameterΦ3-114mm?Wall Thickness0.2-4.5mm

Base on your requirement

Use for PHE


Outer diameterΦ0.1-13mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Forged piece

roundness and square alloy

Base on your requirement

Steel, Alloy


All kinds of Flangs

Base on your requirement

Steel, Alloy

Welding Material

Coil wire Φ0.90mm/1.2mm/1.6mm

Base on your requirement

Certificate of Origin?America, Sweden, Britain, Germany, Austria, Italy, France.

Straight WireΦ1.2mm/1.6mm/2.4mm/3.2mm/4.0mm

Welding rodΦ2.4mm/3.2mm/4.0mm


Elbow, three links, four links, different diameter size

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Explosive bonded laminate

Raw Sheet Thickness≥2mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

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