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Reactor material Inconel 600

By Thomas Huang December 8th, 2023 122 views
Contents

I, Definition

Inconel 600 alloy is a nickel-chromium-iron-based solid solution-strengthened alloy. 

II, Inconel 600 Composition:

2.1 Chemical Composition

 C  Mn  Si  P  S  Cr  Ni  Cu  Fe
 Inconel 600  ≤0.15  ≤1.00  ≤0.50  ≤0.030  ≤0.015  14.0~17.0  71.0~78.0  ≤0.50  6.0~10.0

2.2 Metallographic structure of Inconel 600

Inconel 600 has a face-centered cubic lattice structure.

2.3 Inconel 600 Silmiar metals grades

 China    USA  Germany  United Kingdom  France
 Standard  GB  UNS  SEW VDIUV   BS  AFNOR
 Inconel 600  NS3102   N06600   W.Nr.2.4816 NiCr15Fe   NA14  NC15Fe

Inconel 600 supply specifications:
Round steel, bars, strips, tubes, valve seats, balls, flanges, and forgings.

III, Properties:

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:

Density 8.4g/cm3
Melting point 1370-1425°C
Magnetic 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:

Alloy 600 is corrosion-resistant to a wide range of corrosive media.
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).
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.
Alloy 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.
It has excellent corrosion resistance in high-purity water used in primary and secondary cycles in nuclear reactors.
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.
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.
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.
photo of Catalytic regenerators

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


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