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          • 800-HPALLOY
          • 1985 E 500 N Windfall, IN 46076
            444 Wilson St Tipton, IN 46072
            Post Office Box 40 Tipton, IN 46072
            tel:8004725569

          INCOLOY alloy 27-7MO Sheet and Plate UNS S31277

          Request a quote

          Fe Base, Ni 27, Cr 22, Mo 7, Cu 1

           

          High Performance Alloys stocks and produces this grade in the following forms: sheet, plate, coil. Request quote on this grade.

           

          1. Download PDF - Or view as HTML
          2. Download FDA statement concerning the use of stainless steels as food contact surfaces of equipment. 154 KB PDF

           

          Overview

          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


          Pitting Resistance Equivalency Number - A means of comparing the corrosion resistance of alloys is by their Pitting Resistance Equivalency Number or 'PREN'. Alloys exhibiting higher PREN values are generally found to be more resistant to localized corrosion than those with lower PREN values. The PREN can be calculated by several different equations based upon the chemical composition of the alloys. Some equations are applicable to stainless steels while others are better applied to nickel-based alloys. The equation used here is generally accepted as being applicable to a wide range of alloy compositions. When comparing alloys by their PREN it is absolutely necessary that the same equation be used for all materials to be compared. Comparing alloys by PRENs generated from different equations will give erroneous results. For more information on the use of PRENs to compare the corrosion resistance of materials, refer to the Special Metals publication, “High Performance Alloys for Resistance to Aqueous Corrosion” or visit the Special Metals website, www.specialmetals.com. PRENs for alloy 27-7MO and similar materials are seen in Table 5. Based on these values of PREN, alloy 27-7MO would be predicted to offer significantly better corrosion resistance than alloy 25-6MO (and similar grades of super-austenitic

          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 ambient temperature.

           

          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
          Type

          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

           

          INCOLOY® is a registered trademark of Special Metals Corporation



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