Materials

INCONEL® 6252.4856 – UNS N06625 – NiCr22NO9NB

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.

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Products

INCONEL® 625
Availability
seamless-pipe Seamless Tubes

  stock
welded-pipe Welded Tubes  stock
plate Plates  stock
bar Bars  stock
flanges Flanges  stock
accessories Fittings  stock

Applications

  • 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 150C
  • 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

General characteristics

  • Excellent mechanical properties at both extremely low and extremely high temperatures
  • Outstanding resistance to pitting, crevice corrosion and intercrystalline corrosion
  • Almost complete freedom from chloride induced stress corrosion cracking
  • High resistance to oxidation at elevated temperatures up to 1050C
  • 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.

Technical information

Specifications

 

Alloy 625 – UNS N06625
Products Norm ASTM
Seamless Tubes B-444 B-704 B-705
Welded Tubes B-444 B-704 B-705
Plates B-443
Bars B-446
Flanges B-564
Fittings B-366

Chemical specifications %

 

Alloy 625 – UNS N06625
Element Simbol Maximum %
Carbon C 0,10
Manganese Mn 0,50
Phosphorus P 0,015
Sulfur S 0,015
Silicon Si 0,50
Nickel Ni min. 58,0
Chrome Cr 20,0-23,0
Molybdenum Mo 8,0-10,0
Iron Fe 5,0
Aluminum Al 0,40
Columbio+Tantalus Cb+Tn 3,15-4,15
Cobalt Co 1,0
Titanium Ti 0,40

Mechanical Properties

Alloy 625 – UNS N06625
Norm Rm min. Rp 0,2% min. E4d min.% Z min.% T.I.(J) HR B HB
B-443 a.1 120 (827) 60 (414) 30
a.2 110 (758) 55 (379) 30
a.3 110 (758) 55 (379) 30
b.4 100 (690) 40 (276) 30
B-444 a 120 (827) 60 (414) 30
b 100 (690) 40 (276) 30
B-446 a * 120 (827) 60 (414) 30
a ** 110 (758) 50 25
b 100 (690) 40 (276) 30
B-564 a * 98 (680) 39 (270) 30
a ** 84 (580) 39 (270) 15
B-704 a 120 (827) 60 (414) 30
b 100 (690) 40 (276) 30

a = Grade 1: Annealed at 1600ºF (871ºC) minimum

b= Grade 2: Solution annealed at 2000ºF (1093ºC) minimum, with or without subsequent stabilization annealed at 1800ºF (982ºC) minimun to increase resistance to sensitization

1 = Cold-rolled sheet and strip

2 = Hot-rolled sheet and hot-rolled plate up to 2.75 in. (70 mm.), incl.

3= Cold-rolled plate up to 0.375 in. (9.5 mm.), incl.

3= Cold-rolled plate up to 0.375 in. (9.5 mm.), incl.

* = Diameter or Distance Between Paralell Surfaces, in. (mm) up to 4 (102), incl.

** = Diameter or Distance Between Paralell Surfaces, in. (mm) over 4 (102) to 10 (254), incl.

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