UNS N06625 NC22DNb W.Nr.2.4856 Inconel alloy 625 Nickel-based Alloy
Inconel alloy 625 Nickel-based Alloy
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1.Introduction:
Inconel Alloy 625 is an austenitic nickelchromium-molybdenum-niobium alloy possessing a rare combination of outstanding corrosion resistance coupled with high strength from cryogenic temperatures to 1800°F(982°C).
The strength of Inconel Alloy 625 is derived from the solid-solution hardening of the nickel-chromium
matrix by the presence of molybdenum and niobium. Therefore, precipitation-hardening treatments
are not required.
The chemical composition of Inconel Alloy 625 is also responsible for its outstanding corrosion resistance in a variety of severe operating environments along with resistance to oxidation and carburization in high temperature service. The alloy is resistant to pitting, crevice corrosion, impingement corrosion, intergranular attack and is almost immune to chloride stress corrosion cracking.
Inconel Alloy 625 can be easily welded and processed by standard shop fabrication practices.
2.Applications:
• Aerospace Components: bellows and expansion joints, ducting systems, jet engine exhaust systems, engine thrust-reversers, turbine shroud rings
• Air Pollution Control: chimney liners, dampers, flue gas desulfurization (FGD) components
• Chemical Processing: equipment handling both oxidizing and reducing acids, super-phosphoric acid production
• Marine Service: steam line bellows, Navy ship exhaust systems, submarine auxiliary propulsion systems
• Nuclear Industry: reactor core and control rod components, waste reprocessing equipment
• Offshore Oil and Gas Production: waste flare gas stacks, piping systems, riser sheathing, sour gas piping and tubing
• Petroleum Refining: waste flare gas stacks
• Waste Treatment: waste incineration components
3.Size Range:
Plate and Sheet: Thickness: 0.016″-3.00″, Width: 20″-48″
Round Bar: 1/4″ Diameter to 12″ Diameter
Tube (welded & seamless): Outer Diameter: 1/16″-3″, Wall Thickness: 0.010″-0.250″,
Length: 17’/24′ FT R/L
Pipe: 1/4″ sch 10 to 16″ sch 80
Wire: 0.1mm-20mm
4.Quality Standard:
ASTM B443 Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNSN06625) and Nickel-Chromium-Molybdenum-Silicon Alloy(UNS N06219)* Plate, Sheet, and Strip
ASTM B446 Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNSN06625) rod and bar
AMS 5666 Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, Extrusions, and Rings, 62Ni – 21.5Cr – 9.0Mo – 3
AMS 5599 Nickel Alloy, Corrosion and Heat Resistant Sheet Strip and Plate 62Ni-21.5Cr-9.0Mo-3.7Cb (Nb) Solution Heat Treated
AMS 5879
BS EN ISO 15156-3 Petroleum and Natural Gas industries materials for use in H2s containling environments in oil and gas production part3 cracking resistant CRAs (corrosion resistant alloys) and other alloys
BS3072
5.All Grades Comparison
| DIN | UNS | ANFOR |
|---|---|---|
| W.Nr.2.4856 | N06625 | NC22DNb |
6.Chemical Composition(%)
| C | Si | Mn | P | S | Cr | Ni | Cb+Ta | Co | Mo | Fe | Al | Ti |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.1 max | 0.5 max | 0.5 max | 0.015 max | 0.015 max | 20.0-23.0 | 58.0 min | 3.15-4.15 | 1.0 max | 8.0-10.0 | 5.0 max | 0.4 max | 0.4 max |
7.Mechanical Properties
| Form and Delivery Condition | Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Elongation % in 2″ (50.8 mm) | Reduction Of Area (%) | Hardness (HBW) |
|---|---|---|---|---|---|
| Rod, Bar and Plate (As Rolled) | 827-1103 | 414-758 | 60-30 | 60-40 | 175-240 |
| Rod, Bar and Plate (Annealed) | 827-1034 | 414-655 | 60-30 | 60-40 | 145-220 |
| Rod, Bar and Plate (Solution-Treated) | 724-896 | 290-414 | 65-40 | 90-60 | 116-194 |
| Sheet and Strip (Annealed) | 827-1034 | 414-621 | 55-30 | / | 145-240 |
| Tube and Pipe, Cold Drawn (Annealed) | 827-965 | 414-517 | 55-30 | / | / |
| Tube and Pipe, Cold Drawn (Solution-Treated) | 689-827 | 276-414 | 60-40 | / | / |
8.Pickling:
Sodium hydride baths are necessary to descale this alloy. After the sodium hydride treatment, the material should be immersed in a sulfuric acid bath 165°F (74°C) for approximately 3 minutes. A 25-minute immersion in a nitric-hydrofluoric bath 145°F (63°C) is then necessary. Rinse. Sulfuric solution: 16% by weight, H2SO4. Nitric solution: 8% HNO3 by weight and 3% HF by weight. Acid etching for macro-inspection-expose material electrolytically to a 3-to-1 HCl to HNO3 solution, saturated with CuCl2 at a current density of 0.645 amp/in² (25.4 A/m)
9.Heat Treatment:
Inconel Alloy 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.
10.Oxidation Resistance:
The oxidation and scaling resistance of Inconel Alloy 625 is superior to a number of heat resistant austenitic stainless steels such as 304, 309, 310 and 347 up to 1800°F (982°C) and under cyclic heating and cooling conditions. Above 1800°F (982°C), scaling can become a restrictive factor in service.
Corrosion Resistance:
The highly alloyed chemical composition of Inconel Alloy 625 imparts outstanding corrosion resistance in a variety of severely corrosive environments. The alloy is virtually immune to attack in mild conditions such as the atmosphere, fresh and sea water, neutral salts and alkaline solutions. Nickel and chromium provide resistance to oxidizing solutions and the combination of nickel and molybdenum supply resistance in non-oxidizing environments. Molybdenum also makes Alloy 625 resistant to pitting and crevice corrosion, while niobium acts as a stabilizer during welding to prevent intergranular cracking. The high nickel content of Inconel Alloy 625 makes it virtually immune to chloride stress
corrosion cracking.
The alloy resists attack by mineral acids such as hydrochloric, nitric, phosphoric and sulfuric, and to alkalis and organic acids in both oxidizing and reducing conditions.
Fabrication Data:
Inconel Alloy 625 can be easily welded and processed by standard shop fabrication practices, however
because the high strength of the alloy, it resists deformation at hotworking temperatures.
Hot Forming
The hot-working temperature range for Alloy 625 is 1650–2150°F (900–1177°C). Heavy working needs to occur as close to 2150°F (1177°C) as possible, while lighter working can take place down to 1700°F (927°C).
Hot-working should occur in uniform reductions to prevent duplex grain structure
Cold Forming
Inconel Alloy 625 can be cold-formed by the standard shop fabrication practices. The alloy should be in the annealed condition. Work hardening rates are higher than the austenitic stainless steels.
Welding
Inconel Alloy 625 can be readily welded by most standard processes including GTAW (TIG), PLASMA,
GMAW (MIG/MAG), SAW and SMAW (MMA). A post weld heat treatment is not necessary. Brushing with a
stainless steel wire brush after welding will remove the heat tint and produce a surface area that does not require additional pickling.
Machining
Inconel Alloy 625 should preferably be machined in the annealed condition.
Since Alloy 625 is prone to workhardening, only low cutting speeds should be used and the cutting tool
should be engaged at all times. Adequate cut depth is necessary to assure avoiding contact with the
previously formed work-hardened zone.
Mill′s test certificate:
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
Quality & Testing
Fushun supply Certification with all shipments, containing full chemical analysis and also mechanical test results if requested.
All incoming material is visually inspected and PMI (Positive Material Identification) tested before processing begins and all our production material is checked during each stage of processing.
All incoming orders are produced to the individual customer specification, some of which may involve processing sample batches for testing prior to full production.
Final Inspection carried out on all finished material to include:
Visual inspection
Dimensional checks
PMI (Positive Material Identification)
Mechanical tests
Nickel Alloy Material Available Formats
Fushun offers pure Nickel alloy materials in a variety of forms, including:
Seamless & welded pipe
Seamless & welded tube
Bar
Wire
Sheet
Plate
Forgings
Pipe fittings
Flanges
Weld Rod
Nickel Alloy Supply Quantities for Single Items or Full Bills
At Fushun, we can supply single items or full bills of nickel alloy materials for most any project. No inquiry is too small. We offer quick responses to customer inquiries and specialize in the rapid delivery of both large and small quantities of nickel alloy products.
Contact Fushun for Nickel Alloy Materials Today
Contact us for more information regarding our nickel alloy material options, or request a quote for further pricing details today. Fushun is your trusted nickel alloy supplier and manufacturer of premium nickel alloy materials.
