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ASTM B564 Inconel 625 UNS N06625 weld neck flat face (ff) flanges ASME B16.5

 What are the characteristics of Incoloy 825? 

• Excellent resistance to reducing and oxidizing acids
• Good resistance to stress-corrosion cracking
• Satisfactory resistance to localized attack like pitting and crevice corrosion
• Very resistant to sulfuric and phosphoric acids
• Good mechanical properties at both room and elevated temperatures up to approximately 1020° F
• Permission for pressure-vessel use at wall temperatures up to 800°F

Alloy 825 (UNS N08825) Chemical Composition, %
Ni Fe Cr Mb Cu Ti C Mn S Si Al
38.0-46.0 22.0 min 19.5-23.5 2.5-3.5 1.5-3.0 .6-1.2 0.05 max 1.0 max 0.03 max 0.5 max 0.2 max

Corrosion Resistance
Alloy 825 has a high level of corrosion resistance. It resists general corrosion, pitting, crevice corrosion, intergranular corrosion, and stress-corrosion cracking in both reducing and oxidizing environments.
In what applications is Incoloy 825 used?
• Chemical Processing
• Pollution-control
• Oil and gas well piping
• Nuclear fuel reprocessing
• Components in Pickling equipment like heating coils, tanks, baskets and chains
• Acid production

ASTM Specifications
Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate Bar Forging Fitting
B423       B424 B425 B564 B366, B564
General Mechanical Properties
Tensile (ksi) .2% Yield (ksi)
85 30-35
Alloy 825 has good mechanical properties from cryogenic temperatures to moderately high temperatures. However, exposure to temperatures above 1000° F can result in microstructural changes that significantly lower ductility and impact strength. Alloy 825 should not be used at temperatures where creep-rupture properties are design factors.

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