Alloy 625 – TUBES

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Applications

INDUSTRIAL

Offshore Industry, Furnace Linings, Geothermal Power Plants, ect.

Chemical Composition (Nominal) %
Element Percentage (%)
Ni (Nickel) 58.0 min
Cr (Chromium) 20.0 – 23.0
Mo (Molybdenum) 8.0 – 10.0
Nb + Ta (Niobium + Tantalum) 3.15 – 4.15
Fe (Iron) 5.0 max
Co (Cobalt) 1.0 max
Mn (Manganese) 0.50 max
Si (Silicon) 0.50 max
Ti (Titanium) 0.40 max
Al (Aluminum) 0.40 max
C (Carbon) 0.10 max
P (Phosphorus) 0.015 max
S (Sulfur) 0.015 max

 

Features

GRADE 1

  • 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 acid
  • Good mechanical properties

GRADE 2

  • Excellent creep strength above about 600°C
  • Good resistance to many types of hot gas corrosion, particularly chlorination
Physical Properties
Density 8.47 g/cm³ (0.306 lb/in³)

 

Standard

ASTM B444 for seamless pipe and tube

Material

INCONEL 625 / UNS N06625 / 2.4856

Mechanical Properties
Heat Treatment Tensile Strength

min, ksi (MPa)

 Yield Strength

min, (0.2% offset)

ksi (MPa)

 Elongation

in 2 in. or 50.8 mm

(or 4 D), min, %
Grade 1 (annealed) 120 (827) 60 (414) 30
Grade 2 (solution annealed) 100 (690) 40 (276) 30
Surface

Bright annealed / annealed

Package

Wooden case

Heat Treatment

Soft Annealing / Solution Annealing

Alloy 625 is used in applications where the operating temperatures are below 600°C (1,112°F) in the soft annealed condition (grade 1).

The soft annealing is carried out at temperatures of 950 to 1,050°C (1,742 to 1,922°F); a temperature of 980°C (1,796°F) is preferred.

For applications above 600°C (1,112°F), the solution annealed variant of Alloy 625 (grade 2), which provides optimized creep strength, is used. The solution heat treatment should be carried out in the temperature range between 1,080°C and 1,160°C (1,976 and 2,120°F), preferably at 1,120°C (2,048°F).