Alloy 625 Mechanical Properties
Rod, Bar and Plate
Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Reduction of Area | Hardness, Brinell |
|---|
As-Rolled | 827–1103 MPa | 414–758 MPa | 30–60% | 40–60% | HB 175–240 |
Annealed | 827–1034 MPa | 414–655 MPa | 30–60% | 40–60% | HB 145–220 |
Solution-Treated | 724–896 MPa | 290–414 MPa | 40–65% | 60–90% | HB 116–194 |
Sheet and Strip
Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness, Brinell |
|---|
Annealed | 827–1034 MPa | 414–621 MPa | 30–55% | HB 145–240 |
Tube and Pipe
Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|
Annealed | 827–965 MPa | 414–517 MPa | 30–55% |
Solution-Treated | 689–827 MPa | 276–414 MPa | 40–60% |
High-Temperature Tensile Strength (Typical)
Temperature | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|
800 °C | 380 – 520 | 200 – 310 | 30 – 55 |
900 °C | 200 – 280 | 100 – 170 | 40 – 65 |
980 °C | 100 – 140 | 50 – 80 | 50 – 70 |
Note: Values shown above are typical and may vary by product form, size, heat treatment, manufacturing process and applicable specification. They are not guaranteed specification values. For purchased material, mechanical properties shall be verified against the applicable ASTM, ASME, AMS or other specified standard and the corresponding Mill Test Certificate (MTC). Charpy impact toughness remains high at cryogenic temperatures (down to −196 °C) with no ductile-to-brittle transition.
Alloy 625 combines high tensile strength with good ductility and corrosion resistance. Its mechanical performance can be adjusted through heat treatment and cold working depending on the required application. Annealed and solution-treated conditions are commonly selected according to service temperature, mechanical requirements, and applicable material specifications.
Alloy 625 Physical Properties
Property | Typical Value |
|---|
Density | 8.44 g/cm³ |
Melting Range | 1290–1350 °C |
Thermal Conductivity | Approx. 9.8 W/m·K at 20 °C |
Electrical Resistivity | Approx. 1.29 μΩ·m at 20 °C |
Elastic Modulus | Approx. 207 GPa at room temperature |
Magnetic Properties | Generally non-magnetic |
Note: Physical property values may vary depending on temperature, product condition, and test method. Values shown are for general reference and should not be considered guaranteed material specifications.
Alloy 625 Standards & Specifications
Product Form | Common Specifications |
|---|
Bar / Rod | ASTM B446 / ASME SB446 |
Plate | ASTM B443 / ASME SB443 |
Sheet | ASTM B443 / applicable specification |
Seamless Pipe & Tube | ASTM B444 / ASME SB444 |
Wire | Applicable ASTM / AMS specifications |
Forgings | Applicable ASTM / ASME specifications |
Alloy 625 Applications
Chemical Processing
Components and equipment exposed to corrosive chemical environments.
Oil & Gas
Components used in demanding oil and gas processing environments.
Marine & Offshore
Equipment and components exposed to seawater and chloride-containing environments.
Aerospace
Selected aerospace components requiring high strength and corrosion resistance.
Power Generation
Components used in high-temperature and corrosive operating environments.
Alloy 625 FAQ
Inconel 625 vs Inconel 718?
718 (UNS N07718) is age-hardenable and substantially stronger: annealed and aged sheet or plate to AMS 5596 requires minimum 1,241 MPa (180 ksi) tensile and 1,034 MPa (150 ksi) yield, against 827 / 414 MPa for 625 Grade 1. 718 is used from −253 °C to 704 °C (−423 to 1,300 °F) where creep, rupture and fatigue strength govern — turbine discs and casings, fasteners, cryogenic tankage. Choose 625 instead when aggressive corrosion or higher-temperature oxidation resistance governs. 625 contains 8–10 % molybdenum against 2.8–3.3 % in 718, which gives it distinctly better resistance to chloride pitting, crevice attack and reducing acids; it also requires no aging cycle, which simplifies welding and fabrication.
Inconel 625 vs Incoloy 825?
825 (UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium, designed to resist sulfuric and phosphoric acids and to handle both oxidizing and reducing media. 625 is the higher-strength, more highly alloyed option: better chloride pitting and crevice resistance, better high-temperature oxidation resistance, and usable at far higher temperatures. Where sulfuric or phosphoric acid duty is the governing requirement, 825 is generally the more economical selection; where strength, chloride resistance or elevated temperature is the constraint, 625 is the choice.
Which product forms and sizes are available?
Plate, sheet and strip;round and flat bar;seamless and welded pipe and tube;fittings and forgings;welding wire and covered electrodes.Cut-to-length,non-standard diameters and machined components are produced to order against drawing or specification.Certification documentation accompanies each shipment — please confirm the MTC type required when ordering.
Is Alloy 625 heat treatable?
Not in the precipitation-hardening sense.The alloy is solid-solution strengthened and gains no strength from an aging treatment. Mill annealing is normally performed at 1,925 °F (1,052 °C);solution treatment at 2,000 °F (1,093 °C) or above is used where maximum elevated-temperature stability is required. Strength can be raised by cold work — fine cold-drawn wire reaches tensile strengths above 2,000 MPa after 75–90 % reduction.
What are the common standards for Alloy 625?
Common specifications for Alloy 625 depend on the product form and may include ASTM, ASME, AMS, and other applicable material specifications. For example, ASTM B446 is commonly associated with nickel alloy rod and bar, while ASTM B443 and ASTM B444 cover other Inconel 625 product forms. The applicable specification should be confirmed according to the required product and application.
What industries use Alloy 625?
Alloy 625 is used in a range of demanding industries, including chemical processing, oil and gas, marine and offshore, aerospace, power generation, and pollution-control equipment.
