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Inconel 625 Nickel Alloy Products Fine Grained Aqueous Corrosion For Corrosive

Inconel 625 Nickel Alloy Products Fine Grained Aqueous Corrosion For Corrosive

Brand Name : VANFORGE
Certification : ISO9001, ISO10012, ISO14001, OHSAS18001, ABS, BV, DNV, Lloyd, NK
Place of Origin : China
MOQ : 500 kg
Payment Terms : L/C, T/T
Supply Ability : 50 metric tons per month
Delivery Time : 60 days
Packaging Details : Seaworthy package for export
Price : Negotiable
Material : Inconel 625
Process : Open die forged
Treatment : Annealed
Surface : Peeled
Shape : Round
Length : Cut to length on request
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Forged corrosion resistant nickel alloy Inconel 625 round bar for high temperature service


INCONEL® nickel-chromium alloy 625 (UNS N06625/W.Nr. 2.4856) is used for its high strength, excellent fabricability (including joining), and outstanding corrosion resistance. Service temperatures range from cryogenic to 1800°F (982°C).


Strength of INCONEL alloy 625 is derived from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix; thus precipitation hardening treatments are not required. This combination of elements also is responsible for superior resistance to a wide range of corrosive environments of unusual severity as well as to high-temperature effects such as oxidation and carburization.


The properties of INCONEL alloy 625 that make it an excellent choice for sea-water applications are freedom from local attack (pitting and crevice corrosion), high corrosion-fatigue strength, high tensile strength, and resistance to chloride-ion stress-corrosion cracking. It is used as wire rope for mooring cables, propeller blades for motor patrol gunboats, submarine auxiliary propulsion motors, submarine quick disconnect fittings, exhaust ducts for Navy utility boats, sheathing for undersea communication cables, submarine transducer controls, and steam-line bellows. Potential applications are springs, seals, bellows for submerged controls, electrical cable connectors, fasteners, flexure devices, and oceanographic instrument components.


High tensile, creep, and rupture strength; outstanding fatigue and thermal-fatigue strength; oxidation resistance; and excellent weldability and brazeability are the properties of INCONEL alloy 625 that make it interesting to the aerospace field. It is being used in such applications as aircraft ducting systems, engine exhaust systems, thrust-reverser systems, resistance welded honeycomb structures for housing engine controls, fuel and hydraulic line tubing, spray bars, bellows, turbine shroud rings, and heat-exchanger tubing in environmental control systems. It is also suitable for combustion system transition liners, turbine seals, compressor vanes, and thrust-chamber tubing for rocket


The outstanding and versatile corrosion resistance of INCONEL alloy 625 under a wide range of temperatures and pressures is a primary reason for its wide acceptance in the chemical processing field. Because of its ease of fabrication, it is made into a variety of components for plant equipment. Its high strength enables it to be used, for example, in thinner-walled vessels or tubing than possible with other materials, thus improving heat transfer and saving weight. Some applications requiring the combination of strength and corrosion resistance offered by INCONEL alloy 625 are bubble caps, tubing, reaction vessels, distillation columns, heat exchangers, transfer piping, and valves.


In the nuclear field, INCONEL alloy 625 may be used for reactor-core and control-rod components in nuclear water reactors. The material can be selected because of its high strength, excellent uniform corrosion resistance, resistance to stress cracking and excellent

pitting resistance in 500°-600°F (260-316°C) water. Alloy 625 is also being considered in advanced reactor concepts because of its high allowable design strength at elevated temperatures, especially between 1200°-1400°F (649-760°C).


The properties given in this bulletin, results of extensive testing, are typical of the alloy but should not be used for specification purposes. Applicable specifications appear in the last section of this publication.


Chemical composition, %

Nickel………………………………………………………58.0 min.

Chromium…………………………………………………20.0-23.0

Iron…………………………………………………………5.0 max.

Molybdenum………………………………………………8.0-10.0

Niobium (plus Tantalum)…………………………………3.15-4.15

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.

Cobalta………………………………………………………1.0 max.


Mechanical Properties

For service at 1200°F and below, hot finished, cold-finished, and annealed conditions (depending on requirements involved) are recommended.


For service above 1200°F, either annealed or solution-treated material will give best service. The solution-treated condition is recommended for components that require optimum resistance to creep or rupture. Fine-grained (annealed) material may be advantageous at temperatures up to 1500°F with respect to fatigue strength, hardness, and tensile and yield strength.


Microstructure

INCONEL alloy 625 is a solid-solution matrix stiffened face-centered-cubic alloy. The alloy may contain carbides, which are inherent in this type of alloy. Carbides that can be found are MC and M6C (rich in nickel, niobium, molybdenum, and carbon). In addition M23C6, a chromium-rich carbide, appears in solution-treated material exposed at lower temperatures.


The hardening effect that takes place in the material on exposure in the range centered around 1200°F (See Mechanical Properties section) is due to sluggish precipitation of a nickel-niobium-rich phase, gamma prime. This phase gradually transforms to orthorhombic Ni3Nb when the alloy is heated for long times in the intermediate temperature range.


Extensive investigation of the stability of alloy 625 following exposure for extended periods in

the 1000° to 1800°F temperature range has shown complete absence of embrittling intermetallic phases such as sigma.


Corrosion Resistance

Aqueous Corrosion

The high alloy content of INCONEL alloy 625 enables it to withstand a wide variety of severe corrosive environments. In mild environments such as the atmosphere, fresh and sea water, neutral salts, and alkaline media there is almost no attack. In more severe corrosive environments the combination of nickel and chromium provides resistance to oxidizing chemicals, whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments. The high molybdenum content also makes this alloy very resistant to pitting and crevice corrosion, and niobium acts to stabilize the alloy against sensitization during welding, thereby preventing subsequent intergranular cracking. Also, the high nickel content provides freedom from chloride ion stress corrosion cracking.


This combination of characteristics makes INCONEL alloy 625 useful over a broad spectrum of corrosive conditions. For instance, it has been recommended as a material of construction for a storage tank to handle chemical wastes, including hydrochloric and nitric acids – chemicals which represent directly opposite types of corrosion problems. Materials which resist either one of these acids are normally severely attacked by the other.


High-Temperature Oxidation

INCONEL alloy 625 has good resistance to oxidation and scaling at high temperature.


Working Instructions

Hot- or cold-formed parts are usually annealed at 1700°-1900°F for times commensurate with thickness; higher temperatures may be used to soften material for additional cold work. INCONEL alloy 625 is solution-treated at 2000°-2200°F. These temperatures are metal temperatures based on batch operations and may not apply to continuous annealing, which normally consists of short exposure in the hot zone of a furnace set at higher temperatures. The rate of cooling after heating has no significant effect on INCONEL alloy 625.


Hot and cold forming

Because INCONEL alloy 625 was especially developed to retain high strength at elevated temperature, it resists deformation at hot-working temperatures. It is readily fabricated by hot forming, however, provided adequately powerful equipment is used.


When INCONEL alloy 625 is hot-formed, it should be heated in a furnace whose temperature is held at (but not above) 2150°F. The work should be brought up to as close to 2150°F as conditions permit. Heavy forging can be carried out from 2150°F down to 1850°F. Lighter reductions can be taken down to 1700°F. To guard against duplex grain structure, the work should be given uniform reductions. Final minimum reductions of 15 to 20% for open-die work are recommended.


Welding

INCONEL alloy 625 is readily joined by conventional welding processes and procedures. INCONEL Filler Metal 625 and INCONEL Welding Electrode 112 are nickel-chromium-molybdenum products designed for welding INCONEL alloy 625 to itself and to other materials. Like alloy 625, deposited weld metals from both products are highly resistant to corrosion and oxidation and have high strength and toughness from the cryogenic range to 1800°F. They require no postweld heat treatments to maintain their high strength and ductility. When used to weld INCONEL alloy 625 to dissimilar metals, both products tolerate a high degree of dilution yet maintain characteristic properties.


INCONEL Filler Metal 625 and INCONEL Welding Electrode 112 are also used as “over-matching composition” welding products for iron-nickel-chromium-molybdenum corrosion-resistant alloys including 316 and 317 stainless steels, 6% molybdenum super-austenitic stainless steels, INCOLOY ® alloys 825 and 020, and INCONEL alloy G-3. The higher alloy content of the alloy 625 welding products offsets the effects of elemental segregation in weldments which can result in preferential weld corrosion.


INCONEL Filler Metal 625 is designed for use with the gas-tungsten-arc and various gas-metal-arc processes. Operating characteristics are similar to those of other nickel-chromium filler metals. INCONEL Welding Electrode 112, for shielded meta-arc welding, has excellent operability. The slag produced is hard, but it detaches in large sections when fractured, leaving clean weld metal.


Available Products and Specifications

INCONEL alloy is designated as UNS N06625, Werkstoff Number 2.4856 and ISO NW6625 and is listed in NACE MR-01-75. It is available in all standard mill forms including rod, bar, wire, and wire rod, plate, sheet, strip, shapes, tubular products, and forging stock. Full information on available products may be obtained from the offices listed on the back cover.


Rod, Bar, Wire and Forging Stock - ASTM B 446/ASME SB 446 (Rod & Bar), ASTM B 564/ASME SB 564 (Forgings), SAE/AMS 5666 (Bar, Forgings, & Rings), SAE/AMS 5837 (Wire), ISO 9723 (Rod & Bar), ISO 9724 (Wire), ISO 9725 (Forgings), VdTÜV 499 (Rod & Bar), BS 3076NA21 (Rod & Bar), EN 10095 (Rod, Bar, & Sections), DIN 17752 (Rod & Bar), ASME Code Case 1935 (Rod, Bar, & Forgings), DIN 17754 (forgings), DIN 17753 (Wire).


Pipe & Tube - ASTM B 444/B 829 & ASME SB 444/SB 829 (Seamless Pipe & Tube), ASTM B704/B 751 & ASME SB 704/SB 751 (Welded Tube), ASTM B705/B 775 & ASME SB 705/SB 775 (Welded Pipe), ISO 6207 (Tube), SAE/AMS 5581 (Seamless & Welded Tube), VdTÜV 499 (Tube), BS 3074NA21 (Seamless Pipe & Tube), DIN 17751 (Tube), ASME Code Case 1935.


Other Product Forms - ASTM B 366/ASME SB 366 (Fittings), ISO 4955A (Heat Resisting Steels & Alloys), DIN 17744 (Chemical composition of all product forms).


Product size range
Diameter: 100mm - 600mm
Length: on request

Production Process










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