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800H/AT       ESPECIFICAÇÕES TÉCNICAS

800H/AT is an austenitic heat resistant alloy designed for high temperature structural applications. The strength of 800H/AT is achieved by controlled levels of carbon, aluminum and titanium along with a 2100°F minimum anneal to achieve a grain size of ASTM 5 or coarser.

800H/AT is commonly welded using RA 82 (ERNiCr-3) bare wire for applications under 1450°F. RA330-04 (N08334) bare wire offers a closer match of thermal expansion coefficient, and somewhat higher strength. For maximum strength alloy 617 (ERNiCrCoMo-1) bare wire or 117 (ENiCrCoMo-1) covered electrodes are suggested. To avoid possible stress relaxation grain boundary cracking of N08811 in applications above 1000°F the welded fabrication may be heated 1650°F for about one hour per inch of thickness or 30 minutes minimum then air cooled.


Chemical Composition, %

 

 

Cr

Ni

Mn

Si

Al

Ti

Al +Ti

C

Cu

P

S

Fe

MIN

19.0

30.0

-

-

0.15

0.15

0.85

0.06

-

-

-

39.5

MAX

23.0

35.0

1.5

1.0

0.6

0.6

1.2

0.1

0.75

0.045

0.015

-

 


Specifications

UNS: N08811, N08810 W. Nr./EN: 1.4958, 1.4959 ASTM: B 409, B 408, B 407 ASME: SB-409, SB-408, SB-407 Code Case 1325


Common Trade Names

800H, Incoloy® 800, Alloy 800



 

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


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