corrosion resistance nickel Incoloy Alloy 800HT

INCOLOYalloy 800HT

(UNS N08811)

Several other alloy manufacturers entered the alloy

800H (UNS N08810) market and additional creep and

rupture data became available. The Metals Property

Council for ASME gathered this data and made a new

analysis using parametric procedures, involving 87

heats and 1,052 data points. The additional data, from

other manufacturers, included results with considerably

lower strength, and the new analysis, which reflected

the results of all the available data, resulted in a

recommendation that the design stresses be revised.

These revised values were lower for temperatures of

1100 through 1500°F (593-816°C), and about the same

for 1600 and 1650°F (871 and 899°C).

Special Metals knew the importance of maintaining

the aluminum and titanium contents in the upper portion

of the specified material range. This resulted in higher

creep and stress rupture properties than competitive

alloy 800H. Therefore, to maintain higher allowable

design stresses, the company introduced a variation of

INCOLOY alloy 800H which is called INCOLOY alloy

800HT (UNS N08811). INCOLOY alloy 800HT has a

restricted chemistry, within the limits of alloy 800H,

and requires a heat treatment of 2100°F (1149°C)

minimum. The carbon is 0.06 to 0.10% (alloy 800H is

0.05 to 0.10%), the Al + Ti is 0.85 to 1.20% (alloy 800H

is 0.30 to 1.20% Al + Ti).

The maximum allowable stresses for INCOLOY alloy

800HT (UNS N08811) are contained in ASME Code Case

1987 – latest revision. The alloy meets all the requirements

for UNS N08811 and N08810 (alloy 800H) and can be

certified to either or both UNS numbers. It is important to

note that INCOLOY alloy 800HT (UNS N08811) has higher

maximum allowable design stresses than UNS N08810.

Therefore, other materials produced to UNS N08810 (alloy

800H) cannot be certified as UNS N08811 unless they meet

the additional requirements for this designation. INCOLOY

alloy 800HT is the result of years of monitoring and

maintaining the ultimate properties in this series of alloys by

The Special Metals Corporation group of companies, the

inventor of all the INCOLOY 800 series alloys.

Available Product Forms:
Rod, bar, forgings, wire, plate, sheet, strip, pipe, tube, pipe fittings.

Specifications

INCOLOY alloy 800Ht is designated as UNS N08811 and Werkstoff Number 1.4959. It is listed in NACE MR0175 for oil and gas service. 

Rod, Bar, Wire and Forging Stock:  ASTM B564, ASTM B408.

Plate, Sheet and Strip: - ASTM B 409;
Pipe & Tube: ASTM B407, ASTM B163;

Pipe fittings: ASTM B366 WPNIC11

Chemical Composition

Nickel 0 30.0-35.0

Chromium .0 19.0-23.0

Iron 39.5 min.

Carbon  0.06-0.10

Aluminum  0.25-0.60

Titanium  0.25-0.60

Aluminum + Titanium  0.85-1.20

mechanical property:

specifications:

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