Nickel Alloy 925/ Incoloy 925 Round Bar, N09925 Flat Bar, Rod

Alloy 925

Alloy 925 (UNS N09925) is an agehardenable nickel-iron-chromium alloy with additionsof molybdenum, copper, titanium and aluminum. The alloy’s chemical composition, 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.

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 gaswell 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.

W.Nr 2.4856UNS N09925API 6CRA 925ASTM B446 / ASME SB446ASTM B443 / ASME SB443ASTM B564 / ASME SB564ASTM F467 / F467MASTM F468 / F468MAMS 5666BS 3076

Chemical Composition

Standard

Grade

Chemical composition %

Ni:

Fe:

Cr:

Mo:

Cu:

Ti:

Al:

Mn:

Nb:

Si:

Comments:

Special Metals

Incoloy® 925

42.0-46.0

>22.0

19.5-22.5

2.5-3.5

1.5-3.0

1.9-2.4

0.1-0.5

<1.0

<0.5

<0.03

ASTM / UNS

Alloy 925 / UNS N09925

38.0-46.0

>22.0

19.5-23.5

2.5-3.5

1.5-3.0

1.9-2.4

0.1-0.5

<1.0

<0.5

<0.03

GB/T

H09925 / NS2401

42.0-46.0

>22.0

19.5-22.5

2.5-3.5

1.5-3.0

1.9-2.4

0.1-0.5

<1.0

<0.5

<0.03

P<0.03

ISO

Alloy 925 / N09925

38.0-46.0

>22.0

19.5-23.5

2.5-3.5

1.9-2.4

<1.0

<0.5

<0.03

Mechnical Properties

Properties	Metric	Imperial
Tensile strength (Precipitation-hardened. Value at room temperature)	1210 MPa	175000 psi
Yield strength (Precipitation-hardened. Value at room temperature)	810 MPa	117000 psi
Elongation at break (Precipitation-hardened)	24%	24%

Physical Properties

Density (Kg.m-1)	8080
Magnetic Permeability (20°C)	1.001
Young’s Modulus (N/mm2)	199
Specific Heat, 20°C (J/(g.K))	435
Electrical Resistivity, 20°C (Ω-m)	1.17x10-6
Electrical Conductivity, 20°C (mΩ/mm2)	0.25 (1.48% IACS)
Thermal conductivity, 20°C (W/(m.K))	12
Mean coefficient of thermal expansion, 20-100°C (m/m/K)	13.2x10-6

A brief history of Alloy 925
Originally developed in the 1980s for the oil and gas industry, it quickly became apparent that Alloy 925 could combine exceptional corrosion resistance with enhanced mechanical properties. This nickel-based superalloy builds on the foundation of Alloy 825, adding precipitation hardening elements like titanium and aluminum to improve its strength. Its design specifically targeted applications in sour gas environments, where materials must resist both sulfide stress cracking and general corrosion.
Common applications
Alloy 925 is widely used in the manufacture of downhole tubulars, valves, and fasteners that operate in sour gas wells. Its resistance to chloride-induced stress corrosion cracking and pitting makes it ideal for subsea and offshore drilling equipment. Additionally, its high strength and excellent corrosion resistance allow it to perform reliably in components exposed to highly acidic conditions in chemical processing plants.
Thermal and Mechanical Performance
Alloy 925 is capable of maintaining its strength and corrosion resistance at elevated temperatures, making it suitable for high-pressure and high-temperature applications. Its precipitation hardening capability ensures exceptional tensile strength and resistance to creep under long-term stress. The alloy’s unique composition provides stability in environments with rapid temperature fluctuations, such as those encountered in oil field operations.
Modern Innovations
Alloy 925 has seen increased utilization in advanced industrial designs due to its machinability and adaptability to modern manufacturing techniques. The alloy's ability to be fabricated into intricate shapes without compromising its mechanical properties has made it a valuable material in additive manufacturing. Furthermore, ongoing developments in processing technologies, such as high-precision forging and controlled heat treatment, have expanded its potential for use in new energy applications and complex engineering systems.

Alloy 925

Size Ranges

BAR

FLAT

TUBULAR

BILLET

Chemical Composition

Mechnical Properties

Physical Properties

A brief history of Alloy 925

Common applications

Thermal and Mechanical Performance

Modern Innovations

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