ThePipingMart Blog Grades UNS J95405 Alloy – Composition, Properties and Uses

UNS J95405 Alloy – Composition, Properties and Uses

UNS J95405

If you are in the manufacturing industry, you may have encountered UNS J95405. This material is widely used in machinery, aerospace, marine, and chemical industries due to its excellent mechanical and physical properties. In this blog post, we’ll delve into what UNS J95405 is, its composition, physical and mechanical properties, hardness uses, heat treatment, welding, and corrosion resistance.

What is UNS J95405?

UNS J95405, also known as Duplex Stainless Steel, is a blend of austenitic and ferritic stainless steel. It is an alloy with roughly equal amounts of ferrite and austenite phases. This gives it a unique combination of strength, toughness, and resistance to corrosion. This type of stainless steel is more resistant to stress corrosion cracking than austenitic varieties and also resistant to chloride-induced pitting and crevice corrosion.

UNS J95405 Composition

UNS J95405 is a family of steel grades characterized by their high resistance to corrosion. Its major elements are chromium, nickel, molybdenum, and nitrogen. The composition of UNS J95405 is designed to improve weldability and increase resistance to stress corrosion cracking. It also contains elements such as copper and tungsten that enhance its mechanical properties.

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Mo(%)
0.35-0.75 Max 2.50 Max 2.00 Max 0.04 Max 0.040 17.0-21.0 37.0-41.0 Max 0.50

UNS J95405 Physical Properties

The physical properties of UNS J95405 include high strength, durability, and resistance to stress corrosion cracking. It has a density of 7.8 g/cm3, a melting point of 1398 °C, and a thermal expansion coefficient of 1.8 × 10−5 K−1. The thermal conductivity of UNS J95405 is relatively low compared to other materials.

Property Density
Temperature T
Specific heat
J / kgK
Thermal conductivity
Electric resistance
439 (≥) 657 (≥) 23 23 43 Solution and Aging, Annealing, Ausaging, Q+T,etc
Creep strain limit
(Rp1,0) N/mm2
Creep rupture strength
(Rp1,0) N/mm2
276 279 241

UNS J95405 Mechanical Properties

UNS J95405 has high strength and wear resistance, making it ideal for use in machinery. The alloy has a yield strength of 550 MPa and a tensile strength of 750 MPa. It also has good flexibility and toughness, essential for components subjected to heavy loads and impacts.

Rp0.2 (MPa)
Rm (MPa)
KV (J)
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition HBW
254 (≥) 233 (≥) 24 13 21 Solution and Aging, Annealing, Ausaging, Q+T,etc 343

UNS J95405 Thermal Properties

Properties Conditions
T (°C) Treatment
Thermal Conductivity (W/m-K) 42.7 100
Specific Heat (J/kg-K) 477 50-100

UNS J95405 Uses

UNS J95405 has found extensive application in various industries due to its unique combination of strength, durability, and resistance to corrosion. It manufactures valves, pumps, heat exchangers, pressure vessels, and pipe systems in the chemical, seawater, and petrochemical industries. It is also used in pulp and paper, food processing, and transport.

UNS J95405 Hardness

UNS J95405 has high strength and hardness, making it valuable in many applications. Its hardness varies depending on the heat treatment applied to the alloy. The hardness of UNS J95405 ranges from 30-35 HRC, which is lower than that of austenitic stainless steel but higher than that of ferritic or martensitic stainless steel.

UNS J95405 Heat Treatment

UNS J95405 is duplex stainless steel that is easily heat-treatable. Heat treatment is a process of heating and cooling a material to enhance its mechanical properties. Depending on the intended use of the alloy, the heat treatment can vary, including annealing, quenching, and tempering.

UNS J95405 Welding

UNS J95405 is easily weldable and requires minimal preheating or post-welding treatments. However, using the right welding techniques and materials is important to ensure a strong, corrosion-resistant weld. Welding should be avoided in the heat-affected zone to prevent stress corrosion cracking.

UNS J95405 Corrosion Resistant

UNS J95405 has excellent resistance to a wide range of corrosive environments. It has been tested and found to be resistant to various types of corrosion, including general, intergranular, and stress corrosion cracking. The alloy offers excellent pitting and crevice corrosion resistance thanks to its high nickel, molybdenum, and chromium content.


UNS J95405 is a popular material in various industries due to its high strength, durability, and resistance to corrosion. Its unique combination of mechanical and physical properties makes it ideal for applications that involve heavy loads and exposure to harsh environments. As a duplex stainless steel, it offers many advantages over other materials, including excellent resistance to stress corrosion cracking and chloride-induced pitting and crevice corrosion. Knowing its composition, properties, and applications can help you make an informed decision about choosing this material for your next project.

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