Inconel

Neeka Tubes exporter and supplier of Inconel alloys C- 276, HX, 22, 600, 601, 625 & 718 in the form of Plate, Sheet, Bar, Wire, Pipe, Tubing, Pipe Fittings, Flanges and Electrode.

The registered trademark name, Inconel, is applied as the prefix name to more than twenty different highly corrosion resistant high temperature strength metal alloys produced by Special Metals Corporation. These Inconel alloys or superalloys are nickel-based alloys that exhibit traits such as high resistance to corrosion, oxidation, carburization, pitting, crevice, corrosion cracking, and high temperature strength. Often, Inconel is referred to as “Inco”.

Alloys of identical chemical and mechanical properties are available from other manufacturers and offer excellent alternatives to the various Inconel® brand alloys.

The corrosion-resistant superalloys are widely used in extreme environments where tremendous heat and corrosion resistance is paramount to the integrity of the end product. Chemical processing, nuclear, petrochemical, aerospace and marine industries widely use these superalloys.

What are the Characteristics of Inconel?

  • Good resistance to acids, such as sulfuric, phosphoric, nitric, and hydrochloric
  • Almost completely free from chloride induced stress corrosion cracking
  • Excellent mechanical properties at both extremely low and extremely high temperatures
  • Outstanding resistance to pitting, crevice corrosion and intercrystalline corrosion
  • High resistance to oxidation at elevated temperatures

In what Applications are Inconel alloys used?

  • Chemical and petrochemical processing
  • Components where exposure to high mechanical stress and sea water are required
  • Flare stacks on offshore oil platforms
  • Gas turbines, rocket motors/engines, and space craft
  • Pollution control equipment
  • Nuclear reactors

 

 

 

Inconel 600

Inconel 600 is a nickel-chromium alloy used for applications that require corrosion and high temperature resistance. This nickel alloy was designed for service temperatures from cryogenic to elevated temperatures in the range of 2000° F. It is non-magnetic, has excellent mechanical properties, and presents the desirable combination of high strength and good weldability under a wide range of temperatures. The high nickel content in Inconel 600 enables it to retain considerable resistance under reducing conditions, makes it resistant to corrosion by a number of organic and inorganic compounds, gives it excellent resistance to chloride-ion stress-corrosion cracking and also provides excellent resistance to alkaline solutions. Typical applications of this nickel alloy include the chemical, pulp and paper, aerospace, nuclear engineering and heat treating industries.

 

What are the characteristics of Inconel 600?

  • Resistant to a wide range of corrosive media.
  • Virtually immune to chlorine ion stress corrosion cracking
  • Non-magnetic
  • Excellent mechanical properties
  • High strength and good weldability under a wide range of temperatures
  •  

Chemical Composition %

NI + Co
Cr
Fe
C
Mn
S
Si
Cu
72.0 min
14.0-17.0
6.0-10.0
.15 max
1.00 max
.015 max
.50 max
.50 max

 


In what applications is Inconel 600 used?

  • Chemical industry
  • Aerospace
  • Heat treating industry
  • Pulp and paper industry
  • Food processing
  • Nuclear Engineering
  • Gas turbine components

Fabrication with Inconel 600

Alloy 600 can be both hot formed and cold formed using typical processes. Hot working should be performed between 1600° F and 2250° F avoiding any work between1200-1600° F because the ductility decreases in this temperature range. Welding Alloy 600 can be achieved via shielded metal-arc welding, TIG, and MIG.

 

ASTM Specifications

Pipe Smls
Pipe Welded
Tube Smls
Tube Welded
Sheet/Plate
Bar
Forging
Fitting
Wire
B167
B517
B163
B516
B168
B166
B564
B366
-

 


Mechanical Properties

Typical room temperature Tensile Properties of Annealed Material

 

Product Form
Condition
Tensile (ksi)
.2% Yield (ksi)
Elongation (%)
Hardness (HRB)
Rod & Bar
Cold-Drawn
80-100
25-50
35-55
65-85
Rod & Bar
Hot-Finished
80-100
30-50
35-55
65-85
Tube & Pipe
Hot-Finished
75-100
25-50
35*55
-
Tube & Pipe
Cold-Drawn
80-100
25-50
35-55
88 Max
Plate
Hot-Rolled
80-105
30-50
35-55
65-85
Sheet
Cold-Drawn
80-100
30-45
35-55
88 Max

 

Inconel 625

Inconel 625 is a corrosion and oxidation resistant nickel alloy that is used both for its high strength and outstanding aqueous corrosion resistance. Its outstanding strength and toughness is due to the addition of niobium which acts with the molybdenum to stiffen the alloy’s matrix. Alloy 625 has excellent fatigue strength and stress-corrosion cracking resistance to chloride ions. This nickel alloy has excellent weldability and is frequently used to weld AL-6XN. This alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Some typical applications Inconel 625 is used in are chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors.

What are the characteristics of Inconel 625?

  • High creep-rupture strength
  • Oxidation resistant to 1800° F
  • Seawater pitting and crevice corrosion resistant
  • Immune to chloride ion stress corrosion cracking
  • Non-magnetic
  •  

    Chemical Composition%

    Cr
    Ni
    Mo
    Co + Nb
    Ta
    Al
    Ti
    C
    20.00-30.00
    Remainder
    8.0-10.0
    1.0 max
    3.15-4.15
    .40 max
    .40 max
    .10 max
    Fe
    Mn
    Si
    P
    S
     
     
     
    5.0 max
    .50 max
    .50 max
    .015 max
    .015 max
     
     
     


    In what applications is Inconel 625 used?

    • Aircraft ducting systems
    • Aerospace
    • Jet engine exhaust systems
    • Engine thrust-reverser systems
    • Specialized seawater equipment
    • Chemical process equipment

    Fabrication with Inconel 625

    Alloy 625 has excellent forming and welding characteristics. It may be forged or hot worked providing temperature is maintained in the range of about 1800-2150° F. Ideally, to control grain size, finish hot working operations should be performed at the lower end of the temperature range. Because of its good ductility, alloy 625 is also readily formed by cold working. However, the alloy does work-harden rapidly so intermediate annealing treatments may be needed for complex component forming operations. In order to restore the best balance of properties, all hot or cold worked parts should be annealed and rapidly cooled. This nickel alloy can be welded by both manual and automatic welding methods, including gas tungsten arc, gas metal arc, electron beam and resistance welding. It exhibits good restraint welding characteristics.

    ASTM Specifications

    Pipe Smls
    Pipe Welded
    Tube Smls
    Tube Welded
    Sheet/Plate
    Bar
    Forging
    Fitting
    Wire
    B444
    B705
    B444
    B704
    B443
    B446
    -
    -
    -

     

    Mechanical Properties

    Representative Tensile Properties, bar, 1800° F anneal

    Temp° F
    Tensile (psi)
    .2% Yield (psi)
    Elongation in 2 “ (%)
    70
    144,000
    84,000
    44
    400
    134,000
    66,000
    45
    600
    132,000
    63,000
    42.5
    800
    131,500
    61,000
    45
    1000
    130,000
    60,500
    48
    1200
    119,000
    60,000
    34
    1400
    78,000
    58,500
    59
    1600
    40,000
    39,000
    117

 

INCONEL 718

Inconel 718 is a nickel-chromium-molybdenum alloy designed to resist a wide range of severely corrosive environments, pitting and crevice corrosion. This nickel steel alloy also displays exceptionally high yield, tensile, and creep-rupture properties at high temperatures. This nickel alloy is used from cryogenic temperatures up to long term service at 1200° F. One of the distinguishing features of Inconel 718’s composition is the addition of niobium to permit age hardening which allows annealing and welding without spontaneous hardening during heating and cooling. The addition of niobium acts with the molybdenum to stiffen the alloy’s matrix and provide high strength without a strengthening heat treatment. Other popular nickel-chromium alloys are age hardened through the addition of aluminum and titanium. This nickel steel alloy is readily fabricated and may be welded in either the annealed or precipitation (age) hardened condition. This superalloy is used in a variety of industries such as aerospace, chemical processing, marine engineering, pollution-control equipment, and nuclear reactors.

What are the characteristics of Inconel 718?

  • Good mechanical properties – tensile, fatigue and creep-rupture
  • Yield tensile strength, creep, and rupture strength properties are exceedingly high
  • Highly resistant to chloride and sulfide stress corrosion cracking
  • Resistant to aqueous corrosion and chloride ion stress corrosion cracking
  • High temperature resistant
  • Age-hardenable with a unique property of slow aging response that permits heating and cooling during annealing without the danger of cracking.
  • Excellent welding characteristics, resistant to postweld age cracking

Chemical Composition%

Ni
Fe
Cr
Cu
Mo
Nb
C
Mn
50.00-55.00
Remainder
17.00-21.00
.30 max
2.80-3.30
4.75-5.50
.08 max
.35 max
P
S
Si
Ti
Al
Co
B
 
.015 max
.015 max
.35 max
.65-1.15
.20-.80
1.00 max
.006 max
 

 

In what applications is Inconel 718 used?

  • Chemical processing
  • Aerospace
  • Liquid fuel rocket motor components
  • Pollution-control equipment
  • Nuclear reactors
  • Cryogenic storage tanks
  • Valves, fasteners, springs, mandrels, tubing hangers
  • Well head completion equipment and blow out preventers (BOP’s)
  • Gas turbine engine parts

ASTM Specifications

Sheet/Plate
Bar
Wire
B670
B637
-

 

Mechanical Properties

Typical room temperature properties, 1800°F annealed condition

Ultimate Tensile Strength, psi
.2% Yield Strength psi
Elongation %
Hardness Rockwell B
135,000
70,000
45
100