INCOLOY alloy 925 N09925 2.4858
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INCOLOY alloy 925 Description
INCOLOY alloy 925 is designated as UNS N09925. Designations and specifications for the product include NACE MR-01-75, ASME Boiler and Pressure Vessel Code Case 2218 Section VIII Division 1. Alloy 925 is available as tube, round bar, flat bar and forging stock.
INCOLOY alloy 925 Characteristics
INCOLOY® alloy 925 (UNS N09925) is an age- hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum. The alloy’s chemical composition, listed in Table 1, is designed to provide a combination of high strength and excellent corrosion resistance. The nickel content is sufficient for protection against chloride-ion stress- corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing chemicals. The molybdenum aids resistance to pitting and crevice corrosion. The alloy’s chromium content provides resistance to oxidizing environments. The titanium and aluminum additions cause a strengthening reaction during heat treatment.
INCOLOY alloy 925 APPLICATIONS
INCOLOY alloy 925 is used in various applications requiring a combination of high strength and corrosion resistance. Because of the alloy’s resistance to sulfide stress cracking and stress-corrosion cracking in “sour” (H2S containing) crude oil and natural gas, it is used for down-hole and surface gas-well components including tubular products, valves, hangers, landing nipples, tool joints and packers. The alloy is also useful for fasteners, marine and pump shafting and high-strength piping systems.
Alloy 925 INCOLOY Chemical Composition
The following table shows the chemical composition of Incoloy(r) alloy 925™.
| Elements | Content (%) |
| Nickel, Ni | 44 |
| Iron, Fe | 28 |
| Chromium, Cr | 21 |
| Molybdenum, Mo | 3 |
| Titanium, Ti | 2.1 |
| Copper, Cu | 1.8 |
| Aluminum, Al | 0.3 |
| Carbon, C | 0.01 |
INCOLOY alloy 925 Heat Treatment
Solution annealing in preparation for age hardening should be done at 1800-1900°F (980-1040°C) for a minimum of 30 min and a maximum of 4 h. Cool at a rate equivalent to air cooling, or faster, for sizes of 1 in (25 mm) or under. Water quench all sizes over 1 in (25 mm).
The following age hardening treatment is normally used: 1350-1380°F (732-749°C)/6-9 h, FC to 1150°F (621°C), hold at 1150°F (621°C) ± 15°F (8°C) for a total aging time of 18 h. Cool at a rate equivalent to air cooling, or faster.
Tensile Properties of INCOLOY alloy 925
| Form/Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness* | ||
| ksi | M P a | ksi | M P a | % | Rockwell | |
| Round/Solution-Annealed | 99.3 | 685 | 39.3 | 271 | 56 | 76 B |
| Round/Solution-Annealed and Aged | 167.3 | 1154 | 120.6 | 832 | 27 | 32 C |
| Cold Drawn Tubing/Solution- Annealed and Aged | 172.5 | 1189 | 120.4 | 830 | 27 | 35 C |
All values meet the requirements of NACE Standard MR0175.
Mechanical Property Limits for INCOLOY alloy 925
Solution-Annealed and Aged Material SMC internal specification HA 46)
|
Condition | Diameter | Tensile Strength minimum | Yield Strength (0.2% offset) minimum | Elongation in 2 in (50.8 mm) or 4D min. | Reduction of Area minimum | Impact Strength1 min. average | Hardness2 Rockwell C | |||||
| in | mm | ksi | MPa | ksi | MPa | % | % | ftlbf | kgf m | min. | max. | |
| Cold Worked | 5/8 to 3.0 | 15.9 to 76.2 | 140 | 965 | 105 | 724 | 18 | 25 | 35 | 4.85 | 26 | 38 |
| Hot Worked | 1 to 10 | 25.4 to 254 | 140 | 965 | 110 | 758 | 18 | 25 | 35 | 4.85 | 26 | 38 |
Charpy V-Notch – Impact tests performed at -75 F (-60 C), in accordance with ASTM E23. Capability of meeting the strengths shown at room temperature is guaranteed. Hardness testing in accordance with ASTM E 18.
INCOLOY alloy 925 Corrosion Resistance
INCOLOY alloy 925 has a high level of corrosion resistance. In both reducing and oxidizing environments, the alloy resists general corrosion, pitting, crevice corrosion, intergranular corrosion and stress-corrosion cracking. Some environments in which INCOLOY alloy 925 is particularly useful are “sour” (H2S containing) crude oil and natural gas, sulfuric acid, phosphoric acid, and seawater. The performance of INCOLOY alloy 925 under conditions representing sour gas wells is indicated in Figure 6 and Tables 8, 9 and 10. Figure 6 shows resistance to stress- corrosion cracking in a sour environment at high pressure and temperature. Table 8 shows that the alloy resists sulfide stress cracking, a form of hydrogen embrittlement. The tests involve exposure of stressed C-ring specimens (made from a portion of tubing cross section) to a solution containing hydrogen sulfide, sodium chloride and acetic acid.
INCOLOY alloy 925 Metallurgy
INCOLOY alloy 925 is an austenitic nickel-iron-chromium alloy made precipitation hardenable by additions of titanium and aluminum. The precipitation-hardening (age- hardening) heat treatment causes precipitation of gamma prime phase, Ni3 (Al, Ti). The phase greatly increases both the hardness and strength of the alloy. Exposure to elevated temperatures also causes formation of other phases, including eta and sigma. Figure 4 is a time-temperature-transformation diagram, and Figure 5 shows effects of the phases on impact strength of the solution-annealed plus aged alloy.
INCOLOY alloy 925 Hot & Cold Forming
The hot working range for the alloy is 1600 to 2150°F (870 to 1175°C). At temperatures up to 2000°F (1095°C), INCOLOY alloy 925 has hot-working characteristics similar to those of INCOLOY alloy 825. For maximum corrosion resistance and highest strength after direct aging, final hot working should be done in the 1600 to 1800°F (870 to 980°C) range.
The cold-forming behavior of INCOLOY alloy 925 is similar to that of INCOLOY alloy 825 except that alloy 925 has a higher work-hardening rate.
INCOLOY alloy 925 Machining
INCOLOY alloy 925 is an age hardenable alloy with good machinability in the solution-annealed or aged conditions. Rigid tools with positive rake angles and techniques that minimize work hardening of the material are required. Cemented carbide tools produce the highest cutting rates and are recommended for most turning operations involving uninterrupted cuts. High speed steel tools may be used for interrupted cuts, finishing to close tolerances, finishing with the smoothest surfaces, and cutting with the least amount of work hardening. Best results are obtained by rough machining before age hardening and finishing after heat treatment.
INCOLOY alloy 925 Drilling
Steady feed rates minimize excessive work hardening during drilling. Heavy-duty, high speed drills with a heavy web are recommended. For twist drilling, recommended surface speeds are 20-30 ft/min (6-9 m/min) for the solution- annealed condition and 8-10 ft/min (2.4-3.0 m/min) for the aged condition. Feed rates range from 0.005 in/rev (0.13 mm/rev) to 0.015 in/rev (0.4 mm/rev) depending on the drill size. For gun drills [sizes from 1/16 in (1.6 mm) to 2 in (50 mm)], a feed rate of 0.0001-0.003 in/rev (0.0025-0.08 mm/rev) is recommended for both the solution-annealed and aged conditions. The surface speed should be kept at about 220 ft/min (67 m/min) for solution-annealed material and 60 ft/min (18 m/min) for material in the aged condition.
Quality & Testing
Fushun supply Certification with all shipments, containing full chemical analysis and also mechanical test results if requested.
All incoming material is visually inspected and PMI (Positive Material Identification) tested before processing begins and all our production material is checked during each stage of processing.
All incoming orders are produced to the individual customer specification, some of which may involve processing sample batches for testing prior to full production.
Final Inspection carried out on all finished material to include:
Visual inspection
Dimensional checks
PMI (Positive Material Identification)
Mechanical tests
Nickel Alloy Material Available Formats
Fushun offers pure Nickel alloy materials in a variety of forms, including:
Seamless & welded pipe
Seamless & welded tube
Bar
Wire
Sheet
Plate
Forgings
Pipe fittings
Flanges
Weld Rod
Nickel Alloy Supply Quantities for Single Items or Full Bills
At Fushun, we can supply single items or full bills of nickel alloy materials for most any project. No inquiry is too small. We offer quick responses to customer inquiries and specialize in the rapid delivery of both large and small quantities of nickel alloy products.
Contact Fushun for Nickel Alloy Materials Today
Contact us for more information regarding our nickel alloy material options, or request a quote for further pricing details today. Fushun is your trusted nickel alloy supplier and manufacturer of premium nickel alloy materials.
