This article provides an introduction to Inconel 600. It covers the alloy's chemical composition, properties, welding process, and applications. Hope this article can offer yousome help.
ᆞGood resistance to high-temperature corrosion and oxidation.
ᆞExcellent hot and cold working and welding process performance.
ᆞSatisfactory thermal strength and high plasticity below 700°C.
ᆞThe alloy can be strengthened by cold working.
ᆞIt can also be connected by resistance welding, fusion welding, or brazing.
3.1 Inconel 600 Physical Properties:
ᆞDensity 8.4g/cm3
ᆞMelting point 1370-1425°C
ᆞMagnetic properties The alloy is non-magnetic.
3.2 Inconel 600 Minimum value of mechanical properties of the alloy at room temperature:
Tensile strength
Yield strength
Elongation
Unit
Rm N/mm2
RP0.2N/mm2
A5 %
Annealed
550
240
30
Solution treatment
500
180
35
3.3 Mechanical properties of Inconel600 (room temperature)
Material Variety
σЬ/ MPa
σ0.2/MPa
δ5/%
HRB
Bar: Cold drawn annealed
550-690
175-345
55-35
65-85
Hot worked
585-825
240-620
50-30
75-95
Hot worked annealed
550-690
205-345
55-35
68-85
Plate: Hot rolled annealed
550-690
205-345
55-35
65-85
Hot rolled
825-1035
240-450
50-30
80-95
3.4 Specific heat capacity
θ/℃
20
100
200
300
400
500
600
700
800
900
1000
λ/（W/（m·℃）
12.85
13.94
15.15
16.62
18.71
20.72
22.40
24.49
27.00
29.51
31.60
3.5 Coefficient of Linear Expansion
θ/℃
20～200
20～300
20～400
20～500
20～600
20～700
20～800
20～1000
α/10-6℃-1
12.35
12.75
13.10
13.55
14.50
15.15
15.70
16.20
3.6 Inconel 600 has the following properties:
3.6.1
good resistance to corrosion by reducing, oxidizing, and nitrogenating media
3.6.2
good resistance to stress corrosion cracking at both room and high temperatures
3.6.3
excellent resistance to corrosion by dry chlorine and hydrogen chloride gases
3.6.4
good mechanical properties at sub-zero, room, and high temperatures
3.6.5
good creep fracture strength, recommended for use in working environments above 700 ℃.
3.7 Corrosion resistance of Inconel 600:
ᆞ Alloy 600 is corrosion-resistant to a wide range of corrosive media. ᆞ The chromium content gives the alloy better corrosion resistance under oxidizing conditions than nickel 99.2 (alloy 200) and nickel 99.2 (alloy 201, low carbon). ᆞ The higher nickel content gives the alloy excellent corrosion resistance under reducing conditions and in alkaline solutions and is effective in preventing chloride-iron stress corrosion cracking. ᆞAlloy 600 has good corrosion resistance in organic acids such as acetic acid, acetic acid, formic acid, and stearic acid, and moderate corrosion resistance in inorganic acids. ᆞ It has excellent corrosion resistance in high-purity water used in primary and secondary cycles in nuclear reactors. ᆞ A particularly outstanding property of Inconel 600 is its resistance to corrosion by dry chlorine and hydrogen chloride up to an application temperature of 650°C. ᆞ The corrosion resistance of 600 in the annealed state is very good. At elevated temperatures, the alloy in both the annealed and solid solution-treated states has excellent resistance to oxidative spalling and high strength in air. ᆞ The alloys are also resistant to ammonia and nitriding and carburizing atmospheres but are subject to corrosion by some oxidizing media (e.g., green death solution) under alternating redox conditions.
IV, Inconel 600 process properties and requirements:
4.1 Hot working
4.1.1
Hot working temperature range of 1200 ℃ ~ 900 ℃, cooling mode for water quenching or rapid air cooling.
4.1.2
To get the best corrosion resistance and the most suitable crystal structure, heat treatment should be carried out after hot working.
4.1.3
The material can be directly fed into the furnace which has been warmed up.
4.2 Cold working
4.2.1
Cold working material should be annealed or solid solution heat treated state, 600 alloy work hardening rate, and austenitic stainless steel close to, so you can choose a similar processing equipment.
4.2.2
Intermediate annealing should be carried out during cold working quantities.
4.2.3
If the cold working volume is greater than 5%, then the workpiece needs to be solid solution treated.
4.2.4
To reduce material wear, the mold should choose alloy tool steel, carbide or cast steel. The heat treatment process of the parts should be carried out according to the heat treatment system of the corresponding material standards. The annealing treatment of thin plate and strip parts should be carried out in a protective atmosphere.
4.3 Inconel600 welding process
4.3.1 Welding material
Inconel600 is suitable for welding with the same material or other metals by any conventional welding process, such as tungsten electrode inert gas shielded welding, plasma arc welding, manual subarc welding, metal pole inert gas shielded welding, fusion electrode inert gas shielded welding, of which pulse arc welding is the preferred solution. When using manual arc welding, it is recommended to use (Ar + He + H2 + CO2) a variety of components mixed shielding gas.
4.3.2 Filler metals
The following filler metals are recommended for welding
Tungsten electrode gas shielded welding
Nicrofer S 7020
Material No. 2.4806 SG-NiCr20Nb AWS A5.14: ERNiCr-3
Metal Electrode Gas Shielded Welding
Material No. 2.4648 EL-NiCr19Nb AWS A5.11: ENiCrFe-3
For Alloy 600H applications at high temperatures (approx. 900°C), the following solders are recommended:
Tungsten electrode gas shielded welding
Nicrofer S 6020
Material No. 2.4831 SG-NiCr21Mo9Nb AWS A514, ERNiCrMo-3
or
Material No. 2.4806 SG-NiCr20Nb AWS A514, ERNiCr-3
Metal-pole gas-shielded welding
Material no. 2.4621 EL-NiCr20Mo9Nb AWS A5.11, ENiCrMo-3
or
Material No. 2.4648 EL-NiCr19Nb AWS A5.11, ENiCrFe-3
Sub-arc welding is recommended for optimum corrosion resistance.
4.3.3 Metal welding rods:
Nicrofer S 6020-FM625
Material No. 2.4831
SG- NiCr21Mo9Nb
AWS A5.14: ERNiCrMo-3
4.3.4 Flux-coated electrodes
Material no. 2.4621
EL- NiCr20Mo9Nb
AWS A5.11: ENiCrMo-3
V, Inconel 600 application scope application areas are:
5.1
Catalytic regenerators in petrochemical production in applications above 700°C. Alloy 600 is recommended for long service life.
5.2
Thermocouple casing in erosive atmosphere
5.3
Vinyl chloride monomer production: resistance to chlorine, hydrogen chloride, oxidation and carbonization corrosion
5.4
Oxidative conversion of uranium to hexafluoride: resistance to hydrogen fluoride corrosion
5.5
Production and use of corrosive alkali metals, especially in sulfide environments
5.6
Titanium dioxide by chlorination
5.7
Production of organic or inorganic chlorides and fluorides: resistance to corrosion by chlorine and fluorine gases
5.8
Nuclear reactors
5.9
Crank-necked bottles and components in heat treatment furnaces, especially in carbonizing and nitriding atmospheres
