Super Alloy Inconel 725 (UNS N07725)
Super Alloy Inconel 725 (UNS N07725)
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Contact us for more information regarding our nickel alloy manufacturing and distribution options. Fushun is your trusted nickel alloy supplier for all types of Nickel alloy material.
Introduction
Super alloys are metallic alloys used at high temperatures above 540ºC (1000ºF) where high surface stability and deformation resistance are mainly required. Three major classes of super alloys include iron-base, nickel-base and cobalt-base alloys. The iron-base super alloys are generally wrought alloys with stainless steel technology. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. Super alloys are commonly forged, rolled to sheet or produced in various shapes. However, highly alloyed compositions are produced as castings. The following datasheet will discuss in detail about Inconel 725, which is age-hardenable and has high strength and corrosion resistance.
Chemical Composition
The following table shows the chemical composition of Inconel 725™.
| Elements | Content (%) |
| Nickel, Ni | 55 – 59 |
| Chromium, Cr | 19 – 22.5 |
| Iron, Fe | 9 |
| Molybdenum, Mo | 7 – 9.50 |
| Niobium, Nb (Columbium, Cb) | 2.75 – 4 |
| Titanium, Ti | 1 – 1.70 |
| Aluminum, Al | 0.35 |
| Manganese, Mn | 0.35 |
| Silicon, Si | 0.20 |
| Carbon, C | 0.030 |
| Phosphorous, P | 0.015 |
| Sulfur, S | 0.010 |
Physical Properties
The physical properties of Inconel 725™ are given in the following table.
| Properties | Metric | Imperial |
| Density | 8.3 g/cm³ | 0.3 lb/in³ |
| Melting point | 1271-343ºC | 2320-2449ºF |
Mechanical Properties
The mechanical properties of Inconel 725™ are displayed in the following table.
| Properties | Metric | Imperial |
| Tensile strength | 855 MPa | 124000 psi |
| Yield strength (@0.2%) | 427 MPa | 62000 psi |
| Modulus of elasticity | 204 GPa | 29600 ksi |
| Poissons ratio | 0.31 | 0.31 |
| Elongation at break | 57% | 57% |
| Hardness, Rockwell C | 5 | 5 |
Thermal Properties
The thermal properties of Inconel 725™ are displayed in the following table.
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (@21-100°C/69.8-212°F) | 13 µm/m°C | 7.22 µin/in°F |
Description:
Alloy 725 is a nickel-chromium alloy with significant additions of molybdenum, niobium and titanium. It can be supplied in the hot worked, annealed and age-hardened condition. It is age-hardened to achieve extremely high strength, approximately twice that of Alloy 625 in the annealed condition, through the precipitation of ϒ” phase during a controlled heat treatment process. As this high strength is achieved by ageing rather than cold working, it retains excellent ductility and toughness, and this approach is useful for large or non-uniform sections that cannot be strengthened through cold working.
Alloy 725 has very similar corrosion resistance to Alloy 625, and so is utilised in a wide range of very corrosive environments. The high nickel content ensures resistance to stress corrosion cracking, combined with molybdenum to strongly resist reducing environments such as sulphuric and phosphoric acids, chromium to resist oxidising environments such as nitric acid, titanium to inhibit intergranular corrosion, and overall resistance to pitting and crevice corrosion. The overall combination of alloying elements provides excellent resistance to conditions found in sour oil and gas wells, containing carbon dioxide, chlorides and hydrogen sulphide, and is approved under 1075 for such applications.
Key Features:
Suitable for use in highly corrosive sour oil and gas wells, approved under NACE MR 1075
Excellent corrosion resistance in a wide variety of corrosive environments including seawater and industrial acids
Age hardened for extremely high strength
Good ductility and toughness
Excellent resistance to stress corrosion cracking
Applications:
Downhole equipment for corrosive/sour service
Oil and gas hangers, connectors
Fasteners, especially in marine applications
Chemical process equipment
Agitators
Valve stems
Mechanical Properties:
| Bars up to 3” (76mm) diameter or section | Bars greater than 10” (254mm) diameter or section | Bars greater than 10” (254mm) diameter or section | ||||
| 0.2% Proof Stress, min | 827 N/mm2 | 120 ksi | 827 N/mm2 | 120 ksi | 827 N/mm2 | 120 ksi |
| Tensile strength, min | 1034 N/mm2 | 150 ksi | 1034 N/mm2 | 150 ksi | 1034 N/mm2 | 150 ksi |
| Elongation, 5.65√S0 and 4D | 20% | 20% | 20% | |||
| Reduction of Area | 35% | 35% | 35% | |||
| Hardness (Rockwell C) | <43 | <43 | <43 | |||
| Impact Strength (-60oC) Longitudinal, Typical | 54J av (47J min) | 40 ft.lb av (35 ft.lb min) | ||||
| Impact Strength (-60oC) Transverse, Typical | 50J av (43J min) | 37 ft.lb av (32 ft.lb min) | 43J av (37J min) | 32 ft.lb av (27 ft.lb min) | ||
Notes:
Tensile testing shall be carried out in accordance with ASTM A370 or EN10002-1
Minimum properties quoted (tested at room temperature in a longitudinal direction)
Testing performed on each melt of material per heat treatment batch
Physical Properties:
| Density (Kg.m-1) | 8310 |
| Magnetic Permeability (20°C) | < 1.001 |
| Young’s Modulus (kN/mm2) | 204 |
| Poissons Ration | 0.31 |
| Specific Heat, 20°C (J/(g.K)) | 0.43 |
| Electrical Resistivity, 20°C (µΩ-m) | 1.144 |
| Thermal conductivity, 20°C (W/(m.K)) | 10.6 |
| Mean coefficient of thermal expansion, 20-100°C (/K) | 13 x 10-6 |
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.
