Ni 61.0, Cr 21.5, Mo 9.0, Nb+Ta 3.6
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High Performance Alloys stocks and produces Inconel 625 in this grade in the following forms: Bar, square bar, wire cuts, sheet, plate, tube, pipe, fastener, disk, machined, forged. Request quote on this grade.
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Overview
Inconel 625 is a material with excellent resistance to pitting, crevice and corrosion cracking. Inconel 625 is highly resistant in a wide range of organic and mineral acids. Good high temperature strength.
Characteristics
Applications
Chemistry
Ni
Fe
Cr
Si
Mo
Mn
C
Max
5.0
23.0
0.50
10.0
0.50
0.10
Min
58.0
20.0
8.0
Tensile Data
Ultimate Tensile
Yield Strength (0.2% OS)
Elong. in 2 in. or 50mm or 4D, min., %
R/A
Hardness
Cold Worked/Annealed
Min
120 KSI
60 KSi
30
Max
Min
Max
Hot Worked/Annealed
Min
120 KSi
60 KSi
30
Max
Min
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Max
Specifications
Form
Standard
Metal Type
UNS N
Bar
ASTM B446 AMS BS
Wire
AMS
Sheet
ASTM B443 AMS BS
Plate
ASTM B443 AMS BS
Pipe
ASTM B444 ASTM B704 AMS BS GE B50TF133
Tube
ASTM B444 ASTM B704 AMS BS GE B50TF133
Fitting
ASTM B366 Din
Forging
Weld Wire
Weld Electrode
NA 21
All forms
Din
2.
Machining
Machinability Ratings
Nickel & cobalt base corrosion, temperature and wear-resistant alloys, such as Inconel 625, are classified as moderate to difficult when machining, however, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. During machining these alloys work harden rapidly, generate high heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:
CAPACITY - Machine should be rigid and overpowered as much as possible.
RIGIDITY - Work piece and tool should be held rigid. Minimize tool overhang.
TOOL SHARPNESS - Make sure tools are sharp at all times. Change to sharpened tools at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull tool.
TOOLS - Use positive rake angle tools for most machining operations. Negative rake angle tools can be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are suggested for most applications. High speed tools can be used, with lower production rates, and are often recommended for intermittent cuts.
POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the tool dwells in the cut, work hardening occurs, tool life deteriorates and close tolerances are impossible.
LUBRICATION - lubricants are desirable, soluble oils are recommended especially when using carbide tooling. Detailed machining parameters are presented Tables 16 and17. General plasma cutting recommendations are presented in Table 18.
Table 16 RECOMMENDED TOOL TYPES AND MACHINING CONDITIONS Operations Carbide Tools Roughing, with severe interruption Turning or Facing C-2 and C-3 grade: Negative rake square insert, 45 degree SCEA1, 1/32 in. nose radius. Tool holder: 5 degree neg. back rake, 5 degree neg. side rake. Speed: 30-50 sfm, 0.004-0.008 in. feed, 0.150 in depth of cut. Dry2, oil3, or water-base coolant4. Normal roughing Turning or Facing C-2 or C-3 grade: Negative rate square insert, 45 degree SCEA, 1/32 in nose radius. Tool holder: 5 degree neg. back rake, 5 degree neg. side rake. Speed: 90 sfm depending on rigidity of set up, 0.010 in. feed, 0.150 in. depth of cut. Dry, oil, or water-base coolant. Finishing Turning or Facing C-2 or C-3 grade: Positive rake square insert, if possible, 45 degree SCEA, 1/32 in. nose radius. Tool holder: 5 degree pos. back rake, 5 degree pos. side rake. Speed: 95-110 sfm, 0.005-0.007 in. feed, 0.040 in. depth of cut. Dry or water-base coolant. Rough Boring C-2 or C-3 grade: If insert type boring bar, use standard positive rake tools with largest possible SCEA and 1/16 in. nose radius. If brazed tool bar, grind 0 degree back rake, 10 degree pos. side rake, 1/32 in. nose radius and largest possible SCEA. Speed: 70 sfm depending on the rigidity of setup, 0.005-0.008 in. feed, 1/8 in. depth of cut. Dry, oil or water-base coolant. Finish Boring C-2 or C-3 grade: Use standard positive rake tools on insert type bars. Grind brazed tools as for finish turning and facing except back rake may be best at 0 degrees. Speed: 95-110 sfm, 0.002-0.004 in feed. Water-base coolant. Notes: 1 SCEA - Side cutting edge angle or lead angle of the tool.
2 At any point where dry cutting is recommended, an air jet directed on the tool may provide substantial tool life increases. A water-base coolant mist may also be effective.
3 Oil coolant should be premium quality, sulfochlorinated oil with extreme pressure additives. A viscosity at 100 degrees F from 50 to 125 SSU.
4 Water-base coolant should be premium quality, sulfochlorinated water soluble oil or chemical emulsion with extreme pressure additives. Dilute with water to make 15:1 mix. Water-base coolant may cause chipping and rapid failure of carbide tools in interrupted cuts.
Table 17 RECOMMENDED TOOL TYPES AND MACHINING CONDITIONS Operations Carbide Tools Facing Milling Carbide not generally successful, C- grade may work. Use positive axial and radial rake, 45 degree corner angle, 10 degree relief angle. Speed: 50-60 sfm. Feed: 0.005-0.008 in. Oil or waterbase coolants will reduce thermal shock damage of carbide cutter teeth. End Milling Not recommended , but C-2 grades may be successful on good setups. Use positive rake. Speed: 50-60 sfm. Feed: Same as high speed steel. Oil or water-base coolants will reduce thermal shock damage. Drilling C-2 grade not recommended, but tipped drills may be successful on rigid setup if no great depth. The web must thinned to reduce thrust. Use 135 degree included angle on point. Gun drill can be used. Speed: 50 sfm. Oil or water-base coolant. Coolant-feed carbide tipped drills may be economical in some setups. Reaming C-2 or C-3 grade: Tipped reamers recommended, solid carbide reamers require vary good setup. Tool geometry same as high speed steel. Speed: 50 sfm. Feed: Same as high speed steel. Tapping Not recommended, machine threads, or roll-form them. Electrical Discharge Machining The alloys can be easily cut using any conventional electrical discharge machining system (EDM) or wire (EDM). Notes: 5 M-40 series High Speed Steels include M-41 , M-42, M-43, M-44, M-45 and M-46 at the time of writing. Others may be added and should be equally suitable.
6 Oil coolant should be a premium quality, sulfochlorinated oil with extreme pressure additives. A viscosity at 100 degree F from 50 to 125 SSU.
7 Water-base coolant should be premium quality, sulfochlorinated water soluble oil or chemical emulsion with extreme pressure additives. Dilute with water to make 15:1 mix.
Table 18 Plasma Arc Cutting Our alloys can be cut using any conventional plasma arc cutting system. The best arc quality is achieved using a mixture of argon and hydrogen gases. Nitrogen gas can be substituted for hydrogen gases, but the cut quality will deteriorate slightly. Shop air or any oxygen bearing gases should be avoided when plasma cutting these alloys.
INCONEL® is a registered trademark of the INCO family of companies.
Inconel 625 (ASTM B444 UNS N) Nickel-Chromimum-Molybdenum-Columbium Alloys (Nickel 58%) Incoloy 825 (ASTM B424 N) Nickel-Iron-Chromium-Molybdenum-Copper Alloy (Nickel 38 to 46%) Wall thickness: SCH 10, SCH 40, SCH STD, SCH 80, SCH XS, SCH 160 Length: 6 meters, 12 meters or customized. CRA Lined or Clad Pipes with 625 or 825: Lined or clad with carbon steel pipe with mechanical bonding or weld overlay
Nickel alloy 625 is nickel-chromium-molybdenum-columbium alloy material, major content Nickel minimum 58%, also called Inconel 625 or UNS NO under standard ASTM B444 for pipes, or ASTM B443 for plates coils. Other chemical content Chromimum 20% to 23%, Columbium + tantalum 3.15% to 4.15%, Molybdenum 8.0% to 10.0%, columbium Cobalt allow 1.0% max if determined, Iron 5.0% max.
Density of 8.4 g/cm3, melting point of - °C. It has excellent corrosion resistance to inorganic acids, and has excellent corrosion resistance to various corrosive media in oxidative and reducing environments.
Inconel alloy 625 is a non-magnetic, corrosion and oxidation resistant, nickel-chromium based solid solution strengthened deformed superalloy.
A Solid solution strengthened nickel-based deformed superalloy with molybdenum and niobium as the main strengthening elements. The high strength of Inconel 625 is due to the hardened combination of molybdenum and niobium on the nickel-chromium matrix of the alloy. The addition of molybdenum acts with the niobium to stiffen the alloy matrix, providing a high strength without a strengthening heat treatment.
Inconel 625 is extremely resistant to a variety of unusually severe corrosive environments, including high temperature effects such as oxidation and carburization, including corrosion. Because of the solid solution of the refractory Co and Mo in a Nickel-Chromium matrix, provides 625 an outstanding strength and toughness in high temperature ranging from low up to °F (°C).
Inconel 625 material could be clad or lined on high strength carbon steel pipe like API 5L X60, X65, X70, it includes outer mother pipe carbon steel to provide strength, and inner material cladded or lined Inconel 625, to provide high corrosion resistance in various environments including marine, airspace, chemical plants and petrochemical industries.
Cladding or lining inconel alloy 625 material inside of the carbon steel pipe has been a popular option to solve the corrosive problems and save a lot of cost.
High tensile strength and high corrosion fatigue properties;
High resistance to oxidation at elevated temperatures up to C.
Good processing and welding properties are good;
Excellent corrosion resistance and oxidation resistance;
Resistant to stress corrosion in a salt spray atmosphere;
Outstanding resistance to pitting, crevice corrosion and intercrystalline corrosion;
Excellent mechanical properties at both extremely low and extremely high temperatures;
Almost complete freedom from chloride induced stress corrosion cracking;
Good resistance to acids, such as nitric, phosphoric, sulfuric and hydrochloric, as well as to alkalis makes possible the construction of thin structural parts of high heat transfer.
Nickel alloy 625 / Inconel 625 / UNS N has a very low corrosion rate in both marine and non-marine environments, has good seawater corrosion resistance, is resistant to corrosion by various salt solutions, has good corrosion resistance to HNO3 phosphoric acid, and is resistant to heating to the boiling point. The following HCl and low-concentration sulfuric acid are also quite resistant. The aging hardening phenomenon of the alloy after long-term use at 550-700 &#; can lead to some decline in the plasticity of the N/No alloy. And resistance to stress corrosion cracking against chloride ions &#; making it an excellent choice for seawater and aerospace applications.
Aerospace
Marine engineering
Nuclear reactors
Boiler Furnace
Engine parts
Components where exposure to sea water and high mechanical stresses are required.
Oil and gas production where hydrogen sulfide and elementary sulfur exist at temperature in excess of 150&#;.
Components exposed to flue gas or in flue gas desulfurization plants.
Flare stacks on offshore oil platforms.
Hydrocarbon processing from tar-sand and oil-shale recovery projects.
Polution control equipment
Make inconel 625 clad pipe &#; CRA lined and clad pipes with carbon steel pipe by mechanical lined or weld overlay cladding process
Common used parts for this alloy are springs, seals, bellows for submersible controls, cable connectors, fasteners, flexures, and oceanographic instrument components. A wide variety of plates, bars, tubes, and forgings are available. Fabricability is typical for a nickel alloy, with the material readily formable and weldable by a variety of techniques.
Nickel 58% min
Chromium 20% to 23%
Molybdenum 8% to 10%
Iron 5.0% max
Carbon 0.10% max
Manganese 0.50% max
Silicon 0.50% max
Phosphorus 0.015% max
Sulfur 0.015% max
Aluminum 0.40% max
Titanium 0.40% max
Columbium + tantalum 3.15% to 4.15%
UNS N products are furnished in two grades depending on different heat treatment methods:
Grade 1 in annealed, material normally employed in service temperaures up to &#; (593&#;).
Grade 2 in solution annealed, normally employed in service temperature above &#; (593&#;) when resistance to creep and rupture is required.
Hot-working or reannealing may change properties significantly, depending on working history and temperature.
(Other alloy mateiral UNS N and UNS N are supplied in solution annealed condition only.)
ASTM Standard
ASTM B829 Specification for general requirements for Nickel and Nickel Alloy Seamless Pipe and Tube
E112 Test methods for determining average grain size
G28 Test methods for detecting susceptibility to intergranular corrosion in wrought, Nickel-Rich, Chromium-Bearing Alloys.
G48 Test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of Ferric Chloride Solution
Chemical Composition &#; One test per lot.
Tensile Test &#; On test per lot.
Hydrostatic or Nodestructive Electric Test &#; Each piece in each lot.
For Alloy N grade 1 with annealed heat treatment (Annealed &#; 871&#;/&#;), tensile strength minimum 827 Mpa (120 ksi). Yield strength min 414 Mpa 60 ksi, Elongation minimum 30%.
For N grade 2 with solution annealed, TS minimum 690 Mpa (100 ksi), YS minimum 276 Mpa (40ksi), Elongation minimum 30%.
Solution annealed at &#; (&#;) minimum, with or without subsequent stabilization anneal at &#; (982&#;) minimum to increase resistance to sensitization.
Inconel 625 and Incoloy 825 are two most important nickel alloys used in oil and gas industry. The major difference between two materials is the nickel content value, for Inconel 625 Nickel 58% minimum, and for Incoloy 825 Nickel at range of 38% to 46%. And this makes the 625 material more expensive.
lncoloy 825 is an austenitic nickel-iron-chromium-molybdenum-copper alloy also containing high levels of chromium, nickel, copper and molybdenum that can provide high levels of corrosion resistance to both moderately oxidizing and moderately reducing environments.
This balance of alloying elements grants this alloy exceptional resistance to both chloride stress corrosion cracking, as well as crevice corrosion and general corrosion. Chloride stress corrosion cracking is a type of localised intergranular corrosion on materials that are put under tensile strength, in high temperatures and in an environment that includes oxygen and chloride ions such as seawater.
With high content of Nickel included with the percentage of molybdenum and copper in this nickel alloy produces substantially improved corrosion resistance in a corrosive environment such as reducing environments compared to stainless steel. Titanium added in Incoloy Alloy 825 also helps to stabilize the alloy against intergranular corrosion.
Nickel 38% to 46%
Chromium 19.5% to 23.5%
Iron 22.0% minimum
Carbon 0.05% max
Manganese 1.0% max
Copper 1.5% to 3.0%
Silicon 0.5% max
Sulfur 0.03% max
Aluminum 0.2% max
Titanjum 0.6% to 1.2%
Molybdenum 2.5% to 3.5%
Compared with alloy 625 material, alloy 825 has lower content of Nickel, but extra Titanjum and Copper.
Tensile strength 586 Mpa (85 ksi) min, yield strength 241 Mpa (35 ksi) min, Elongation 30% min.
Incoloy 825 (UNS N) is an austenitic, nickel alloy, the material is ductile over a wide range of temperatures from cryogenic to well in excess of °F (538 °C).
Standard and Grades: ASTM B444 UNS N / ASTM B424 N
625 Material types: Nickel-Chromimum-Molybdenum-Columbium Alloys
825 Material types: Nickel-Iron-Chromium-Molybdenum-Copper Alloy
Manufacturing types: Seamless hot rolled, anneald; Welded
Sizes: 1/2&#; to 16&#;
Wall thickness: SCH10, SCH 20, SCH 40, SCH STD, SCH 80, SCH XS, SCH 160
Length: 6 meters, 12 meters or customized.
CRA Lined or Clad Pipes with 625 or 825: Lined or clad with carbon steel pipe with mechanical bonding or weld overlay
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