Excellent mechanical properties and corrosion resistance.
Elevated Temperatures (up to 1000°F / 538°C)
Maintains strength and oxidation resistance.
Low Temperatures
Retains toughness and ductility down to cryogenic temperatures.
Industry Applications
Industry Sector
Applications
Oil and Gas
Downhole equipment, subsea pipelines.
Petrochemical
Heat exchangers, chemical processing equipment.
Marine
Offshore platforms, seawater handling systems.
Power Generation
Condensers, boiler components.
Shape, Size, and Production Standards
Product Form
Shapes Available
Sizes Available
Production Standards
Sheets
Plates, Sheets
Various thicknesses
ASTM B688, ASTM B709
Bars
Round bars, hexagonal bars
Diameter range
ASTM B805
Tubes/Pipes
Seamless tubes, welded pipes
Various dimensions
ASTM B690, ASTM B775
Standards and Corresponding Grades
Country/Region
Standard/Grade
USA
UNS S31277
Europe
1.4529
Germany
X1NiCrMoCuN20-18-7
France
Z1NCDU20.18.06Az
Welding, Processing, Polishing, Heat Treatment
Process
Details
Welding
Excellent weldability using TIG, MIG methods.
Processing
Cold and hot forming processes. Machinable with standard methods.
Polishing
Achieves smooth finishes suitable for sanitary applications.
Heat Treatment
Solution annealing at 2100°F (1150°C) followed by rapid quenching.
Cold Processing, Advantages, and Disadvantages
Aspect
Details
Cold Processing
Excellent formability and cold workability.
Advantages
High resistance to chloride-induced stress corrosion cracking. Good mechanical properties over a wide temperature range.
Disadvantages
Higher initial cost compared to standard stainless steels. Requires expertise in welding to prevent sensitization.
Similar Products
Product Name
Comparison
Alloy 926 (UNS N08926)
Higher molybdenum content, similar applications in aggressive environments.
Alloy 254 SMO (UNS S31254)
Higher chromium and molybdenum content, excellent resistance to pitting and crevice corrosion.
Comparison of Similar Products
Property/Feature
INCOLOY Alloy 27-7MO (UNS S31277)
Alloy 926 (UNS N08926)
Alloy 254 SMO (UNS S31254)
Nickel Content (%)
26.0 – 28.0
24.0 – 26.0
18.0 – 20.0
Chromium Content (%)
26.0 – 28.0
19.0 – 21.0
19.5 – 20.5
Molybdenum Content (%)
6.0 – 7.0
6.0 – 7.0
6.0 – 6.5
Copper Content (%)
1.5 – 2.5
1.5 – 3.0
0.5 – 1.0
Nitrogen Content (%)
0.25 – 0.30
0.15 – 0.25
0.18 – 0.22
Tensile Strength (ksi)
115 min
100 min
100 min
Yield Strength (ksi)
55 min
45 min
45 min
Elongation (%)
40 min
40 min
35 min
Resistance to SCC
High
High
High
Typical Applications
Oil and gas, petrochemical, marine
Chemical processing, marine
Chemical processing, marine
This structured presentation provides a detailed overview of INCOLOY Alloy 27-7MO (UNS S31277), encompassing its chemical composition, mechanical properties, performance characteristics at different temperatures, industry applications, available shapes and sizes, production standards, welding and processing capabilities, as well as the advantages, disadvantages, and comparable products. Each section is organized into tables to ensure clarity and accessibility of technical specifications and comparisons.
