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Inconel 625 Alloys Properties

Product  : Inconel 625
Kategori : Nickel-based Alloy


Standards
• Roundbar: ASTM B446, BS 3076 NA 21,AMS 5666
• Sheet/plate: ASTM B443 AMS 5599 BS3072
• Pipe/Tube: ASTMB444 ASTM B704 AMS 5581 BS3074 GEB50TF133
• Fitting: ASTM B366 Din 17754

Equivalent
W.NR 2.4856, UNS N06625, AWS 012

What is Inconel 625

Inconel 625 is a nonmagnetic , corrosion - and oxidation-resistant, nickel-based alloy. Its outstanding strength and toughness in the temperature range cryogenic to 2000°F (1093°C) are derived primarily from the solid solution effects of the refractory metals, columbium and molybdenum, in a nickel-chromium matrix. The alloy has excellent fatigue strength and stress-corrosion cracking resistance to chloride ions.
Inconel 625 is a material with excellent resistance to pitting, crevice and corrosion cracking. Highly resistant in a wide range of organic and mineral acids. Good high temperature strength.
Iconel Commonly trade names for Inconel Alloy 625 include: Inconel 625, Chronin 625, Altemp 625, Haynes 625, Nickelvac 625 and Nicrofer 6020.
Inconel 625 has withstood many corrosive environments. In alkaline, salt water, fresh water, neutral salts, and in the air, almost no attack occurs. The nickel and chromium provide resistance to oxidizing environments. Nickel and molybdenum provide for resistance to nonoxidizing atmospheres. Pitting and crevice corrosion are prevented by molybdenum. Niobium stabilizes the alloy against sensitization during welding. Chloride stress-corrosion cracking resistance is excellent. The alloy resists scaling and oxidation at high temperatures.

Availability
Roundbar dia.19 - 80mm


INCONEL® Alloys
Inconel 600
Inconel 601
Inconel 601GC®
Inconel 603XL
Inconel 617
Inconel 625
Inconel 625LCF®
Inconel 686
Inconel 690
Inconel 693
Inconel 706
Inconel 718
Inconel 718SPF™
Inconel 725
Inconel 740
Inconel X-750
Inconel 751
Inconel MA754
Inconel MA758
Inconel 783
Inconel N06230
Inconel C-276
Inconel G-3
Inconel HX
Inconel 22


Chemical Composition
Ni Cr Fe Mo Nb Co Mn Cu Al Ti Si C S P B
58 20.0-23.0 5 8.0-10.0 3.15-4.15 1 0.5 0.4 0.4 0.5 0.1 0.015 0.015


Mechanical Properties
Mechanical Properties °C Metric Units
Hardness Rockwell
B94
Ultimate Tensile Strength (MPa) 138.8 ksi 957
Yield Strength at 0.2% (MPa) 72.0 ksi 496
Elongation in 2" (%)
38


Inconel 625 has three basic heat treatments:
(1)High Solution Anneal - 2000/2200°F (1093/1204°C), air quench or faster.
(2)Low Solution Anneal - 1700/1900°F (927/1038°C), air quench or faster.
(3)Stress Relieve - 1650°F (899°C), air quench.



The time at the above temperatures depends on volume and section thickness. Strip, for example, would require shorter times than large sections. Temperatures for treatments No. 1 and 2 are generally held for 1/2 to 1 hour, 1 to 4 hours for treatment No. 3. Treatment No. 1 is not commonly used for applications below 1500°F (816°C). It is generally used above 1500°F and where resistance to creep is important. The high solution anneal is also used to develop the maximum softness for mild processing operations such as cold rolling or drawing. Treatment No. 2 is the used treatment and develops an optimum combination of tensile and rupture properties from ambient temperatures to 1900°F (1038°C). Ductility and toughness at cryogenic temperatures are also very good.
Treatment No. 3 is recommended for application below 1200°F (649°C) when maximum fatigue, hardness, tensile and yield strength properties are desired. Ductility and toughness at cryogenic temperatures are excellent. When a fine grain size is desired for fatigue, tensile and yield strengths up to 1500°F (816°C), treatment No. 3 is sometimes used.

Workability

Hot Working
Hot working may done at 2100°F (1149°C) maximum furnace temperature. Care should be exercised to avoid frictional heat build-up which can result in overheating, exceeding 2100°F (1149°C). Inconel 625 becomes very stiff at temperatures below 1850°F (1010°C). Work pieces that fall below this temperature should be reheated. Uniform reductions are recommended to avoid the formation of a duplex grain structure. Approximately 15/20% reduction is recommended for finishing.

Cold Forming
Inconel 625 can be cold formed by standards methods. When the material becomes too stiff from cold working, ductility can be restored by process anneal.

Machineability
Low cutting speeds, rigid tools and work piece, heavy equipment, ample coolant and positive feeds are general recommendations.

Carbide tools should have smaller angles than high-speed tools and operating speeds can be higher. A sulfur-based cutting fluid is recommended. Thoroughly clean work piece after machining to prevent surface contamination during subsequent heat treating. Chlorine additives would be an alternative.

Weldability
Welding can be accomplished by the gas-shielded processes using a tungsten electrode or a consumable electrode. Postweld heat treatment of the weld are not necessary to maintain corrosion resistance. Heavy restrained sections can be welded and the weld's mechanical properties follow the same trends as base metal properties. Standard practices such as clean surfaces, good joint alignment, U-joints for thicker sections, etc., should be followed.

Physical Properties
Physical Properties °C Metric Units
Density (g/cm3) 22 8.44
Melting point (°C) 1350 1350
Modulus of rigidity (kN/mm2) 79
Modulus of elasticity (kN/mm2) 205.8
Electrical Resistivity (microhm-m) 23 1.26
Mean Coefficient of Thermal 20-204 13.1
Expansion (x 10(-6)m/m-°C)

Thermal Conductivity (W/M-°C) 23 9.8
Specific Heat (J/kg-°C) 0 429


Applications
Inconel 625 typically finds application in: heat shields, furnace hardware, gas turbine engine ducting, aerospace industries, combustion liners and spray bars, chemical plant hardware, nuclear reactor, pollution control equipment and special seawater applications

Related Grades
Inconel 600 | Inconel 601 | Inconel 625 | Inconel 690 | Inconel 713C | Inconel 718 | Inconel 751 | Inconel X-750 | Inconel 792 | Inconel 939


Inconel 600: Solid solution strengthened
Inconel 625: Acid resistant, good weldability. The LCF version is typically used in bellows.
Inconel 690: Low cobalt content for nuclear applications, and low resistivity
Inconel 713C: Precipitaion hardenable nickel-chromium base cast alloy
Inconel 718: Gamma double prime strengthened with good weldability
Inconel 751: Increased aluminium content for improved rupture strength in the 1600 °F range
Inconel 792: Increased aluminium content for improved high temperature corrosion properties, used especially in gas turbines
Inconel 939: Gamma prime strengthened to increase weldability
In age hardening or precipitation strengthening varieties, alloying additions of aluminum and titanium combine with nickel to form the intermetallic compound Ni3(Ti,Al) or gamma prime (γ’). Gamma prime forms small cubic crystals that inhibit slip and creep effectively at elevated temperatures.

Source:
"High-Performance Alloys". Special Metals Corporation.
"Special Alloys: Inconel 625".


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