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Alloy 625, UNS N06625

ASME B168, EN 2.4856, INCONEL 625

Forms

Applications

Alloy 625 Applications

The soft annealed version of  Alloy 625 (grade 1) is used in the oil and gas industry, the chemical process industry, marine engineering and environmental engineering. Typical applications include:

  • Equipment for the production of super phosphoric acid
  • Plants for the treatment of radioactive waste
  • Production pipe systems and linings of risers in oil production
  • Offshore industry and seawater exposed equipment
  • Sea water piping in shipbuilding
  • Stress corrosion cracking resistant compensators
  • Furnace linings

The solution annealed variant of Alloy 625 (grade 2) is used for high temperature applications up to 1,000 °C (1,832 °F), acc. to ASME Code for Pressure Vessels. Typical applications include:

  • Flaring systems in refineries and offshore platforms
  • Recuperators and compensators for hot exhaust gases

FM 625 is used as a matching filler metal for corrosion-resistant coatings of less resistant steels (overlay welding). Typical applications include:

  • Components in the oil and gas extraction
  • Superheater tubes in waste incineration plants

Alloy 625 is also approved by ASME in both the grade 1 and grade 2 conditions for sections I, III, VIII and XII at temperatures defined in ASME Section IID (temperature limits vary by construction code).

Alloy 625 in the soft annealed condition (grade 1) is characterized by Alloy 625 in the solution annealed condition (grade 2) is characterized by
  • Exceptional resistance to pitting, crevice corrosion, erosion and intergranular corrosion.
  • Immunity to chloride-induced stress corrosion cracking.
  • Good resistance to mineral acids such as nitric, phosphoric, sulfuric and hydrochloric acid.
  • Good resistance to alkalis and organic acids .
  • Good mechanical properties.
  • Excellent creep strength above about 600 °C (1,112 °F).
  • Good resistance to many types of hot gas corrosion, particularly chlorination.
Alloy 625 Plate Standards
Rod,Bar 17744
17752
10228 SB 446 B 446
B 564
E 112
Sheet,Plate 17744
17750
6208
9722
SB 443 B 443
Strip 17744 2662 SB 443 B 443
Wire 17744
17753
1088-3 - -
Alloy 625 Designations
EN 2.4856 - NiCr22Mo9Nb
ISO NC22DNb
UNS N06625
AFNOR NC22DNb
Alloy 625 Chemical Composition
Min 58 21 - - - - - - - - - 8 3.2
Max 71 23 5 0.03 0.5 0.4 1 0.4 0.4 0.01 0.01 10 3.8
Alloy 625 Physical Properties
8.47 g/cm3 (0.306 lb/in3) 1,290 - 1,350 ℃(2,354 - 2,462 ℉) 1.003 (Maximum)
Specific Heat -/- 392/521 932/573 1,472/663 1,832/684 2,192/705
Thermal Conductivity -/- 14.2/98.5 19.3/133.8 26.8/185.8 28.2/195.5 -/-
Electrical Resistivity 120 127 132 129 128 -
Modulus Of Elasticity 209/30.3 195/28.3 178/25.8 153/22.2 -/- -/-
Co-efficient of Thermal Expansion -/- 13.03/7.2 13.94/7.7 15.68/8.7 16.63/9.2 -/-
Alloy 625 Mechanical Properties
Yield Strength
MPa/ksi
330/479 260/37.7 225/32.6 1,832/100
Tensile Strength
MPa/ksi
730/105.9 645/93.5 570/82.7 120/17.4
Elongation
%
35 - - -
Alloy 625 Inventory
Alloy 625 Pipe 0.5 in 8 in
Alloy 625 Coil 0.25 mm 3.18 mm
Alloy 625 Welding Wire 0.5 mm 3.175 mm
Alloy 625 Sheet and Plate 0.25 mm 76.2 mm
Alloy 625 Round Bar 12 mm 260 mm
Alloy 625 Pipe Fittings 0.5 in 8 in
Alloy 625 Flanges 0.5 in 8 in

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WELDING

Welding Alloy 625

Alloy 625 can be joined by all conventional welding processes. These include GTAW (TIG), TIG hot wire, plasma arc, GMAW (MIG/MAG) and MAG-Tandem, submerged arc welding and SMAW (MMA). For welding,  Alloy 625 should be in the soft or solution annealed condition and be free from scale, grease and markings. Pulsed arc welding is the preferred technique. For the MAG process the use of a multi-component shielding gas (Ar + He + H2 + CO2) is recommended.

When welding roots, sufficient protection of the root needs to be ensured with pure argon (Ar 4.6) so that the welding seam is free of oxides after welding. Root backing is also recommended for the first intermediate pass following the initial root pass and in some cases even for the second pass, depending on the weld set-up.

Any discoloration/heat tint should be removed preferably by brushing with a stainless steel wire brush while the weld metal is still hot.

Filler metal

The following filler material is recommended: Welding rods, welding wire and wire electrodes Welding strip for joint and overlay welding/cladding
  • FM 625 (W.-Nr. 2.4831).
  • DIN EN ISO 18274: S Ni 6602 (SG-NiCr 21 Mo 9 Nb) UNS N06625.
  • AWS A 5.14: ERNiCrMo-3.
  • Covered electrodes can be used.
  • FM 625/WS 625 (W.-Nr. 2.4831).
  • DIN EN ISO 18274: S Ni 6625/B Ni 6625 UNS N06625.
  • AWS A5.14: ERNiCrMo-3/EQNiCrMo-3 .