Wuxi Zhongxin Special Steel Co.，Ltd
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INCOLOY alloy 27-7MO (UNS S31277; EP1,263,999 B1) 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.
INCOLOY alloy 27-7MO is designated as UNS S31277. Allowable design stresses for ASME Boiler and Pressure Vessel Code construction are defined in ASME Code Case 2458.
Rod, Bar, Wire, and Forging Stock - ASTM A 479/ASME SA 479 (Bar)
Plate, Sheet, and Strip - ASTM A 240/ASME SA 240
Pipe and Tube - ASTM A 213/ASME SA 213 (Tube), ASTM A 249/ASME SA 249 (Tube), ASTM A 312/ASME SA 312 (Pipe)
Other - ASTM A 182/ASME SA 182
| Typical Dimension ranges <Other upon request> | |||
| Form | Specification | Supply Form | Others |
| Sheet | Thickness:0.40-4.75mm,General Width:1000,1219,1500mm | Whole Coil or piece of it | Cold Annealed,Surface 2B,2E |
| Plate | Thickness:4.76-60mm,Width:1500,2000,2500mm,Length:3000,6000,8000,8500mm(Under 10mm plate can be coiled) | Whole Coil or piece of it | Single hot rolling,Solid solution annealed state,Surface 1D |
| Belt | Thickness:0.10-3.0mm,Width:50-500mm | Whole Coil or Specified size | Cold Annealed,Surface 2B,2E |
| Bar & Rod | Rolled barΦ5-45mm,Length≤1500mm | Polished Bar(circle,Square) | Solution annealing,descaling |
| Forged barΦ26-245mm,Length≤4000mm | |||
| Weld tube | Outer diameterΦ4.76-135mm,Wall Thickness0.25-4.00mm,Length:≤35000 mm | Base on your requirement | |
| Seamless Tube | Outer diameterΦ3-114mm,Wall Thickness0.2-4.5mm | Base on your requirement | |
| Wire | Outer diameterΦ0.1-13mm | Base on your requirement | Ni & Ni alloy, Ti & Ti alloy |
| Forged piece | discs,rings,squares,blocks,slabs | Base on your requirement | Steel, Alloy |
| Flangs | All kinds of Flangs | Base on your requirement | Steel, Alloy |
| Welding Material | Coil wire Φ0.025mm-1.6mm | Base on your requirement | Certificate of Origin:America, Sweden, Britain, Germany, Austria, Italy, France. |
| Straight WireΦ1.6mm-4.0mm | |||
| Welding rodΦ1.2mm-4.0mm | |||
| Tube | Elbow, three links, four links, different diameter size | Base on your requirement | Ni & Ni alloy, Ti & Ti alloy |
| Explosive bonded laminate | Raw Sheet Thickness≥2mm | Base on your requirement | Ni & Ni alloy, Ti & Ti alloy |
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
Physical and Thermal Properties
Density at room temperature, mill annealed conditon g/cm³. 8.02
lb/in³..................................................................... 0.289
Permeability at 200 oersted (15.9 kA/m) at room temperature Annealed. 1.004
Permeability at 200 oersted (15.9 kA/m) at -22°F (<-30°C) Annealed. <1.01
50% cold worked................................................. <1.01
Specific Heat, J/kg °C............................................................ 454
Btu/lb °F.................................................................................... 0.109
Electrical Resistivity at room temp., mill annealed condition ohm•circ mil/ft. 604
µohm•cm................................................................ 100
Mechanical Properties
INCOLOY alloy 27-7MO exhibits an optimum combination of strength and ductility. Typical mechanical properties of alloy 27-7MO products are compared with those of similar alloys in Table 4. Alloy 27-7MO is normally supplied in the annealed condition.
Table - Typical Mechanical Properties at Room Temperature
|
Alloy | Ultimate Tensile Strength, ksi / MPa | Yield Strength (0.2%), ksi / MPa |
Elongation % | Hardness Rockwell ‘B’ |
| INCOLOY alloy 25-6MO | 95 / 655 | 45 / 310 | 42 | 90 |
| INCOLOY alloy 27-7MO | 120 / 827 | 60 / 414 | 50 | 95 |
| INCONEL® alloy 625 | 125 / 862 | 68 / 469 | 50 | 95 |
| INCONEL alloy C-276 | 105 / 724 | 50 / 345 | 60 | 88 |
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”
- Pitting Resistance Equivalency Numbers (PREN)*
| Alloy | % Ni | % Cr | % Mo | % Nb | % W | % N | PREN |
| INCOLOY alloy 25-6MO | 25 | 20 | 6.5 | 0 | 0 | 0.20 | 35.8 |
| INCOLOY alloy 27-7MO | 27 | 22 | 7.2 | 0 | 0 | 0.34 | 43.0 |
| INCONEL alloy 625 | 62 | 22 | 9 | 3.5 | 0 | 0 | 40.8 |
| INCONEL alloy C-276 | 58 | 16 | 16 | 0 | 3.5 | 0 | 45.2 |
*PREN = %Cr + 1.5 (%Mo + %W + %Nb) + 30 (%N)
Q: Would you provide samples For free?
A: Yes. with on stock specification We provide samples For Free. Freight charge collect
Q: What information should i provide to source for the right products?
A: Material grade, width, thickness, coating and Purchase quantity, Expected lead time, etc
Q: What are the shipping ports?
A: Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you
can choose other ports according to your needs.
Q: About product prices?
A: Prices vary from period to period due to cyclical changes in the price of raw materials.
Q: How long does your delivery time take?
A: In general, our delivery time is within 5-45 days, and may be delayed if the demand is extremely
large or special circumstances occur.
Q: Can I visit your location?
A: Of course, we welcome customers from all over the world to visit our factory. However, some
of the plants are not open to the public.
Q: Does the product have quality inspection before loading?
A: Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed. We provide All Original Mill test certificate and support third party inspection.
Q: How to pack the products?
A: The inner layer has a waterproof paper outer layer with iron packaging and is fixed with a fumigation
wooden pallet. It can effectively protect products from corrosion during ocean transportation.
Q: What is your working time?
A: In general, our online service time is Beijing time: 8:00-22:00, after 22:00,
we will reply to your inquiry during the next working day.