Inconel 725 N07725 Alloy

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Heat Treatment
Cold Processing
Hot Working

Super Alloy Inconel 725 (UNS N07725)

Super Alloy Inconel 725 (UNS N07725)

Super Alloy Inconel 725 (UNS N07725)

With over 35 years of industry expertise, Fushun has the industry knowledge and resources to find you the metal products that you need for your specific industry applications. We are in stock and ready to quickly deliver hard-to-find metals. Our ISO 9001-certified metal supply is one of the most comprehensive selections on the market. We provide timely customer support and quick delivery on all quantities of our in stock products.

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.


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™.

ElementsContent (%)
Nickel, Ni55 – 59
Chromium, Cr19 – 22.5
Iron, Fe9
Molybdenum, Mo7 – 9.50
Niobium, Nb (Columbium, Cb)2.75 – 4
Titanium, Ti1 – 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.

Density8.3 g/cm³0.3 lb/in³
Melting point1271-343ºC2320-2449ºF

Mechanical Properties

The mechanical properties of Inconel 725™ are displayed in the following table.

Tensile strength855 MPa124000 psi
Yield strength (@0.2%)427 MPa62000 psi
Modulus of elasticity204 GPa29600 ksi
Poissons ratio0.310.31
Elongation at break57%57%
Hardness, Rockwell C55

Thermal Properties

The thermal properties of Inconel 725™ are displayed in the following table.

Thermal expansion co-efficient (@21-100°C/69.8-212°F)13 µm/m°C7.22 µin/in°F


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


Downhole equipment for corrosive/sour service

Oil and gas hangers, connectors

Fasteners, especially in marine applications

Chemical process equipment


Valve stems

Mechanical Properties:

Bars up to 3” (76mm) diameter or sectionBars greater than 10” (254mm) diameter or sectionBars greater than 10” (254mm) diameter or section
0.2% Proof Stress, min827 N/mm2120 ksi827 N/mm2120 ksi827 N/mm2120 ksi
Tensile strength, min1034 N/mm2150 ksi1034 N/mm2150 ksi1034 N/mm2150 ksi
Elongation, 5.65√S0 and 4D20%20%20%
Reduction of Area35%35%35%
Hardness (Rockwell C)<43<43<43
Impact Strength (-60oC) Longitudinal, Typical54J av (47J min)40 av (35 min)
Impact Strength (-60oC) Transverse, Typical50J av (43J min)37 av (32 min)43J av (37J min)32 av (27 min)


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 Ration0.31
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






Pipe fittings


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.