Inconel 725 N07725 Alloy

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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.

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.