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Inconel 625 Specifications

UNS N06625 | ASTM B446 | Complete Technical Data & Applications

Comprehensive specifications for Inconel 625, a nickel-chromium-molybdenum alloy with exceptional corrosion resistance and high-temperature performance.

Inconel 625 Overview

Material Description

Inconel 625 (UNS N06625) is a solid-solution strengthened nickel-chromium-molybdenum alloy with additions of niobium that provide exceptional corrosion resistance and high-temperature strength up to 2000°F (1093°C).

This superalloy exhibits outstanding resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion in marine and chemical processing environments. Its excellent fabricability and weldability make it ideal for complex component manufacturing.

Key Benefits:

  • Excellent corrosion resistance in seawater
  • High-temperature oxidation resistance
  • Outstanding fabricability and weldability
  • Resistance to stress corrosion cracking

Available Forms

Round Bars

0.5" to 12" diameter

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Seamless Tubes

Various sizes available

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Plates & Sheets

Custom dimensions

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Forgings

Custom shapes available

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Technical Specifications

Chemical Composition (%)

ElementMin %Max %
C-0.10
Si-0.50
Mn-0.50
P-0.015
S-0.015
Cr20.0023.00
Ni58.0063.00
Mo8.0010.00
Nb/Cb+Ta3.154.15
Ti-0.40
Al-0.40
Fe-5.00

Mechanical Properties

Solution Annealed Condition
Ultimate Tensile Strength:120 ksi min (827 MPa)
0.2% Yield Strength:60 ksi min (414 MPa)
Elongation in 2 inches:30% min
Reduction of Area:35% min
Hardness (Rockwell B):≤40 HRC
CVN Impact @ -40°C:27 J min (20 ft-lbf)

Physical Properties

Density:8.44 g/cm³ (0.305 lb/in³)
Melting Range:2350-2460°F (1288-1349°C)
Thermal Conductivity @ 70°F:6.1 BTU/hr-ft-°F (10.5 W/m·K)
Specific Heat @ 70°F:0.098 BTU/lb-°F (410 J/kg·K)
Electrical Resistivity @ 70°F:51.0 µΩ·in (129.5 µΩ·cm)
Thermal Expansion @ 70-200°F:7.1 µin/in·°F (12.8 µm/m·K)
Modulus of Elasticity:29.8 × 10⁶ psi (205 GPa)
Magnetic Permeability:1.0015 (essentially non-magnetic)

Applicable Standards

ASTM B446
Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06686) Plate, Sheet, and Strip
Plate, Sheet, and Strip
ASTM B564
Standard Specification for Nickel Alloy Forgings
Forgings
ASTM B443
Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06686) Pipe and Tube
Pipe and Tube
ASTM B444
Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06686) Pipe and Tube
Seamless Pipe and Tube
AMS 5666
Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Rings, and Extrusions 62Ni - 21.5Cr - 9.0Mo - 3.6Cb
Aerospace Applications

Inconel 625 Applications by Industry

Oil & Gas

Common Applications:

  • Seawater service equipment
  • Sour gas service components
  • Heat exchangers
  • Wellhead equipment
  • Subsea manifolds
  • Umbilical tubing

Key Benefits:

Exceptional resistance to chloride-induced stress corrosion cracking and sour gas environments

Service Temperature:Up to 2000°F (1093°C)

Aerospace

Common Applications:

  • Jet engine ducting
  • Thrust reverser components
  • Exhaust systems
  • Heat shields
  • Aircraft structural components
  • Fuel system parts

Key Benefits:

High-temperature oxidation resistance and excellent fabricability

Service Temperature:Up to 1800°F (982°C) continuous

Chemical Processing

Common Applications:

  • Reactor vessels
  • Heat exchangers
  • Piping systems
  • Valve components
  • Pump parts
  • Catalyst recovery systems

Key Benefits:

Resistance to organic acids, chlorides, and reducing environments

Service Temperature:Up to 1800°F (982°C)

Power Generation

Common Applications:

  • Steam generator tubing
  • Superheater tubes
  • Heat recovery systems
  • Boiler components
  • Turbine components
  • Waste heat recovery

Key Benefits:

Excellent thermal fatigue resistance and steam oxidation resistance

Service Temperature:Up to 1800°F (982°C)

Technical Resources & Downloads

Inconel 625 Complete Datasheet

Comprehensive technical data including all properties and specifications

Inconel 625 Welding Guide

Best practices for welding Inconel 625 with filler metal recommendations

Inconel 625 Corrosion Data

Corrosion rates in various chemical environments and temperatures

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