Incoloy alloy 825

Description

Overview:

Incoloy 825 belongs to the Alloy 800 family that packs in nickel-chromium-iron along with the addition of copper, titanium, as well as molybdenum. This alloy brings in features such as high corrosion resistance, moderate oxidization resistance, as well as reducing environment.

This alloy is almost close to the alloy 800. However, it brings in an improved resistance with regards to issues such as aqueous corrosion. The perfect balance of the alloying elements brings in exceptional resistance for corrosion cracking that comes from chloride stress.

Common Names:

• UNS N08825
• Alloy 825
• Nickel 825

Executive Standards:

Bar, Rod, Forging Stock, and Wire

• BS 3076NA16
• ASME SB 425
• ASME SB 564
• ISO 9725
• ASTM B 425
• ASTM B 564
• ASME Code Case N-572
• DIN 17754
• DIN 17752
• ISO 9723
• DIN 17753
• VdTÜV 432
• ISO 9724

Sheet, Plate, & Strip

• BS 3072NA16
• ASTM B 906
• BS 3073NA16
• ASTM B 424
• ASME SB 424
• VdTÜV 432
• ASME SB 906
• DIN 17750
• ISO 6208

Tube & Pipe

• ASTM B 705
• ASME SB 775
• ASME SB 829
• ASTM B 751
• BS 3074NA16
• ASTM B 704
• ASTM B 775
• ASME Code Case 1936
• ASTM B 163
• ASME SB 423
• ASME SB 704
• ASME SB 705
• ASTM B 829
• ASME SB 163
• ASME SB 751
• ASTM B 423
• DIN 17751
• VdTÜV 432 ISO 6207

Chemical Properties:

Chromium (%)	19.50 to 23.50
Nickel (%)	38.00 to 46.00
Titanium (%)	0.06 to 1.2
Iron (%)	22.00 Minimum
Molybdenum (%)	2.50 to 3.50
Carbon (%)	0.05 Maximum
Copper (%)	1.50 to 3.00
Sulfur (%)	0.03 Maximum
Manganese (%)	1.0 Maximum
Aluminum (%)	0.2 Maximum
Silicon (%)	0.5 Maximum

 Mechanical Properties:

Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
772	441	36

 

Physical Properties:

Density	Ibs/in3	0.294
	g/cm3	8.14
Thermal Expansion Coefficient (Mean)	In/inI° F	7.7 X 105
Specific Heat	Btu/lb.° F	0.105
	J/kg•°C	440
Thermal Conductivity	BTU/h-ft-° F	6.4
Elasticity Modulus	Ksi	28.4 X 103
	MPa	196 X 103
Melting Point	oF	2500 to 2550
	oC	1370 to 1400
Permeability	At 70oF	200

Key Features:

• Oxidization Resistance: The presence of chromium adds resistance to the oxidizing conditions like solutions made from nitrates, oxidizing salts, or nitric acid.
• Resistance from Corrosion Cracking: The enhanced nickel content helps resist any cracking that occurs due to stress corrosion from chloride ion.
• Resistance to Pitting: Titanium within the alloy ensures that the product is stabilized to tackle pitting or intergranular attack post-fabrication.
• Resists Acidic Environments: Alloy 825 also has exception corrosion resistance to phosphoric or sulfuric acids.

Product Forms Available:

• Coil
• Strip
• Foil
• Wire

Applications:

• Pollution control
• Components for chemical processing
• Parts for pickling tank
• Gas & oil recovery
• Processing parts for nuclear fuel

Possible Alternative Grades:

• Sanmac 2205:  This is an improved and machined variant of Sandvik SAF 2205. Apart from catering excellent machinability, this alloy provides better resistance to cracking from stress corrosion.
• Incoloy 800: Alloy 800 brings general resistance to corrosion when added to different types of aqueous media.
• Incoloy 840: Comprised of stainless steel, aluminum, and titanium, this alloy grade provides superior resistance to chloride corrosion.

Frequently Asked Questions:

• How to ensure maximum resistance to corrosion for Alloy 825?

To ensure maximum resistance to corrosion, the parts to be hot worked needs to be stabilized & annealed prior to use.

• What is the “C” class alloy?

The Incoloy 825 alloy falls under the “C” class category, which is believed to be pretty easy for machining.

• How is Alloy 825 welded?

Incoloy 825 can easily be welded with the use of normal processes such as GMAW (MIG), SMAW (Manual), SAW, and GTAW (TIG). However, the joint should be cleaned to avoid any type of weld pool contamination.

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