Incoloy 27-7MO (Alloy 27-7MO, UNS S31277) Wire Description:
Inconel®, Incoloy®, and Monel® are Registered Trademarks of Special Metals Corporation and its subsidiaries.
Incoloy alloy 27-7MO is an advanced 7% molybdenum super-austenitic stainless steel offering corrosion resistance in most environments superior to 6% molybdenum super-austenitic stainless steels. In many environments, Incoloy 27-7MO (UNS S31277) offers resistance approaching that of much more highly alloyed materials such as INCONEL alloys 625, 22, and C-276.
Incoloy 27-7MO products typically contain 27% nickel, 22% chromium, 7.2% molybdenum, and 0.34% nitrogen. By virtue of its content of molybdenum, chromium, and nitrogen, alloy 27-7MO offers excellent resistance to pitting and crevice corrosion. Nickel, nitrogen, and molybdenum provide resistance to reducing media while a high content of chromium offers resistance to oxidizing media. Incoloy 27-7MO performs well in mixed acid environments, especially those containing oxidizing and reducing acids.
Other trade names: Alloy 27-7MO, UNS S31277
Specifications of Incoloy alloy 27-7MO wire:
Metal Type: UNS S31277
Standard: ASTM A 479/ASME SA 479
Chemical Composition, %
| |
Ni |
Cr |
Mo |
Mn |
Cu |
Si |
N |
P |
C |
S |
Fe |
| Min |
26 |
20.5 |
6.5 |
|
0.5 |
|
0.3 |
|
|
|
Balance |
| Max |
28 |
23 |
8 |
3.0 |
1.5 |
0.5 |
0.4 |
0.03 |
0.02 |
0.01 |
Applications of Incoloy 27-7MO:
As Incoloy 27-7MO offers a unique combination of corrosion resistance, high strength, and ease of fabrication, it is applied in many industries, such as pollution control, power, marine, chemical processing, pulp and paper, oil and gas, etc.
- Chemical Processing:
- Widely used in the chemical industry for its outstanding corrosion resistance in aggressive chemical environments.
- Marine Engineering:
- Applied in marine engineering applications where resistance to seawater and salt spray corrosion is essential.
- Pollution Control Equipment:
- Utilized in the construction of pollution control equipment due to its ability to withstand corrosive gases and chemicals.
- Pulp and Paper Industry:
- Found in components for pulp and paper processing, providing durability in corrosive paper manufacturing environments.
- Oil and Gas Extraction:
- Employed in oil and gas extraction operations where resistance to corrosive elements is critical for equipment longevity.
FAQs
Q1. What is Incoloy 27-7MO Wire?
Incoloy 27-7MO (UNS S31277) wire is a super-austenitic stainless steel alloy with high levels of molybdenum (Mo) and nitrogen (N), providing excellent corrosion resistance, especially in harsh chloride and acidic environments. It is primarily used in marine, chemical processing, and pollution control applications.
Q2. What are the key properties of Incoloy 27-7MO Wire?
- Superior Corrosion Resistance – Resists pitting, crevice corrosion, and stress corrosion cracking (SCC).
- High Strength & Toughness – Better mechanical properties than conventional stainless steels.
- Excellent Weldability – Suitable for welding without post-weld heat treatment.
- Good Fabricability – Can be formed, machined, and drawn into fine wires.
Q3: Can Incoloy 27-7MO Wire be used for welding?
Yes, Incoloy 27-7MO wire is weldable using GTAW (TIG), GMAW (MIG), and SMAW (stick welding). It does not require post-weld heat treatment, though stress relief annealing may improve corrosion resistance.
 Flange.jpg "Incoloy 27-7MO (Alloy 27-7MO, UNS S31277) Flange")