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ASTM A 213/ASME SA 213 INCOLOY alloy 27 UNS S31277 NICKEL ALLOY SEAMLESS TUBING
INCOLOY alloy 27-7MO (UNS S31277)
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
alloy 27-7MO offers resistance approaching that of much more highly
alloyed materials such as INCONEL alloys 625, 22, and C-276. Alloy
27-7MO products typically contain 27% nickel, 22% chromium, 7.2%
molybdenum, and 0.34% nitrogen. Its limiting chemical composition
is presented in Table 1. The alloy's content of nickel and nitrogen
produce a stable austenitic structure. By virtue of its content of
molybdenum, chromium, and nitrogen, alloy 27-7MO offers excellent
resistance to pitting and crevice corrosion. The nickel, nitrogen,
and molybdenum provide resistance to reducing media while a high
content of chromium offers resistance to oxidizing media. Alloy
27-7MO performs well in mixed acid environments, especially those
containing oxidizing and reducing acids. The alloy's contents of
nickel and nitrogen result in resistance to stress corrosion
cracking and attack by caustic media. Alloy 27-7MO offers excellent
resistance to corrosion in seawater and brine. It also resists
stress corrosion cracking in all concentrations of sodium chloride
up to saturation at the boiling point. It is resistant to the
aggressive media encountered in air pollution control systems such
as flue gas desulfurization equipment for high-sulfur coal-fired
electric power utilities. Applications for INCOLOY alloy 27-7MO are
found in the pollution control, power, marine, chemical processing,
pulp and paper and oil and gas industries. The alloy offers a
unique combination of corrosion resistance, high strength and ease
of fabrication at an economical price. Alloy 27-7MO is available in
standard product forms including plate, sheet, rod, bar, wire rod,
pipe, tube, and forging stock.
Corrosion Resistance
Resistance to Corrosion by Seawater
Nickel-chromium alloys and austenitic and super-austenitic
stainless steels containing molybdenum are well known for their
resistance to corrosion in seawater and marine environments. A test
program conducted at the LaQue Center for Corrosion Technology in
Wrightsville Beach, North Carolina (a laboratory well known for
marine corrosion testing) produced data showing that INCOLOY alloy
27-7MO offers corrosion-resistance superior to many of the
corrosion-resistant alloys commonly used in marine service. Samples
of sheet to which Teflon crevice devices were attached were exposed
to flowing natural seawater at
Applications
Applications for INCOLOY alloy 27-7MO are found in the pollution control, power, marine, chemical processing, pulp and paper and oil and gas industries. The alloy offers a unique combination of corrosion resistance, high strength and ease of fabrication at an economical price. Alloy 27-7MO is available in standard product forms including plate, sheet, rod, bar,
Chemistry
Chemical Requirements | ||||||||
---|---|---|---|---|---|---|---|---|
Ni | Cr | Mo | Mn | C | Si | Cu | Fe | |
Max | 26.0 | 20.5 | 6.5 | 3.00 | 0.02 | 0.5 | 1.5 | Bal. |
Min | 28.0 | 23.0 | 8.00 | 0.5 |
Tensile Data
Mechanical Property Requirements | |||||
---|---|---|---|---|---|
Ultimate Tensile | Yield Strength (0.2% OS) | Elong. | R/A | Hardness | |
Min | 120 KSi | 60 KSi | 50 | Rb 95 | |
Max | |||||
Min | 827 MPa | 414 MPa | |||
Max |
Specifications
Form | Standard |
---|---|
Metal Type | UNS S31277 |
Bar | ASTM A 479/ASME SA 479 |
Wire | ASTM A 479/ASME SA 479 |
Sheet | ASTM A 240/ASME SA 240 |
Plate | ASTM A 240/ASME SA 240 |
Tube | ASTM A 213/ASME SA 213 (Tube), ASTM A 249/ASME SA 249 |
Pipe | ASTM A 312/ASME SA 312 |
Fitting | ASTM A182 |
Forging | ASTM A 479/ASME SA 479, ASTM A182 |
Weld Wire | |
Weld Electrode | |
ASME CODE | Allowable design stresses for ASME Boiler and Pressure Vessel Code construction are defined in ASME Code Case 2458. |
Din |
Machinability RATING: 27% of B-1112
TYPICAL STOCK REMOVAL RATE: 45 surface feet/minute with high speed tools, 125 surface feet/minute with carbide.
Machining Guide | |||||
---|---|---|---|---|---|
Operation | Tool | Speed SFPM | Feed Inch Per Rev. | Depth in Cut Inch | Cut Type |
Turning | WC | 68 88 | .009-.016 .006-.009 | .050-.100 .011-.015 | Rough Finish |
HSS | 18 21 | .007-.011 .003-.008 | .025-.045 .008-.011 | Rough Finish | |
Facing | WC | 68 88 | .009-.016 .006-.009 | .040-.075 .011-.015 | Rough Finish |
HSS | 18 21 | .007-.011 .003-.008 | .025-.045 .008-.011 | Rough Finish | |
Boring | WC | 42 53 | .009-.016 .006-.009 | .043-.060 .012-.015 | Rough Finish |
Drilling | HSS | 18 25 | .003-.007 .002-.004 | --- --- | Rough Finish |
Reaming | HSS | 25 35 | .006-.010 --- | --- .012-.015 | Rough Finish |
Shaping | WC | 20 30 | --- .005-.010 | .060-.090 .018-.025 | Rough Finish |
HSS | 13 15 | --- .005-.010 | .050-.080 .018-.025 | Rough Finish | |
Milling | HSS | 15 25 | 1/2-1 IPM | .100-.200 in. cut | Rough Finish |