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Introduction of Nickel Alloy Incoloy 800
Oct 20, 2017

Alloy 800 is an iron-nickel-chromium alloy with moderate strength and good resistance to oxidation and carburization at elevated temperatures. It is particularly useful for high-temperature equipment in the petrochemical industry because the alloy doesn't form the embrittling sigma phase after long time exposure at 1200°F (649°C). Excellent resistance to chloride stress-corrosion cracking is another important feature of alloy 800.
Alloy 800H is a solution heat treated (2100°F/1150°C), controlled-carbon version of alloy 800 with improved elevated temperature properties. It has improved creep and stress-rupture characteristics in the 1100°F (593°C) to 1800°F (982°C) temperature range.


Applications

· Ethylene furnace quench boilers

· Hydrocarbon cracking

· Valves, fittings and other components exposed to corrosive attack from 1100-1800° F

· Industrial furnaces

· Heat-treating equipment

· Chemical and petrochemical processing

· Super-heater and re-heaters in power plants

· Pressure vessels

· Heat exchangers


Physical Data

Density (lb / cu. in.)

0.287

Specific Gravity

7.98

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.11

Electrical Resistivity (microhm-cm (at 68 Deg F))

595

Melting Point (Deg F)

2500

Poissons Ratio

0.34

Thermal Conductivity

80

Mean Coeff Thermal Expansion

7.9

Modulus of Elasticity Tension

28.5


Chemistry Data 

Elements

Al

C

Cr

Cu

Fe

Mn

Ni

Si

S

Ti

Comp. %

0.15 - 0.6

0.05 - 0.1

19 - 23

0.75 max

Balance

1.5 max.

30-35

max

0.015 max

0.15-0.6


Specifications 

Alloy

Pipe Smls

Tube Smls

Sheet/Plate

Bar

Forging

Fitting

Alloy 800 (UNS N08800)

B407

B163

B409

B408

B564

B366

Alloy 800H (UNS N08810)

B407

B163

B409

B408

B564

B366

Alloy 800HT (UNS N08811)

B407

B163

B409

B408

B564

B366


Mechanical Properties 

Alloy

Product Form

Condition

Tensile ksi(MPa)

.2% Yield ksi(MPa)

Elongation (%)

800

Sheet, Plate

Annealed

85(586)

40 (276)

43

800

Sheet, Plate
Strip, Bar

Annealed

75 (520min)

30 (205min)

30min

800H

Sheet, Plate

Solution heat-treated

80 (552)

35 (241)

47

800H

Sheet, Plate
Strip, Bar

Solution heat-treated

65 (450min)

25 (170min)

30min