2.4602
Data sheet grade 2.4602 / Alloy 22
NiCr21Mo14W
Nickel-chromium-molybdenum alloy with tungsten
Brief description
The material 2.4602 or Alloy 22 or Hastelloy® C-22 is a nickel-chromium-molybdenum-tungsten alloy with a very low carbon and silicon content. This material is resistant to many corrosive media under oxidising and reducing conditions. The material 2.4602 also has excellent resistance to pitting, crevice and stress corrosion cracking.
Standards and nomenclature
| EN | |
|---|---|
| DIN | NiCr21Mo14W |
| AISI | Alloy 22, Hastelloy® C-22 |
| US | N06022 |
| EN | |
|---|---|
| DIN | NiCr21Mo14W |
| AISI | Alloy 22, Hastelloy® C-22 |
| US | N06022 |
Chemical composition according to VdTÜV sheet 479
| Ni (nickel) | 50,0 | 63,0 |
| Cr (chromium) | 20,0 | 22,5 |
| Fe (iron) | 2,0 | 6,0 |
| C (carbon) | - | 0,01 |
| Mn (manganese) | - | 0,5 |
| Si (silicon) | - | 0,08 |
| W (tungsten) | 2,5 | 3,5 |
| V (vanadium) | - | 0,35 |
| P (phosphorus) | - | 0,025 |
| S (sulphur) | - | 0,01 |
| Mo (molybdenum) | 12,5 | 14,5 |
| Co (Cobalt) | - | 2,5 |
-
-
min.
max.
Ni
(nickel)
50,0
63,0
Cr
(chrome)
20,0
22,5
Fe
(iron)
2,0
6,0
C
(carbon)
-
0,01
Mn
(Manganese)
-
0,5
Si
(Silicon)
-
0,08
-
-
min.
max.
W
(Wolfram)
2,5
3,5
V
(Vanadium)
-
0,35
P
(phosphorus)
-
0,025
S
(sulphur)
-
0,01
Mo
(Molybdenum)
12,5
14,5
Co
(Cobalt)
-
2,5
General properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | good |
| Weldability | good |
Corrosion resistance
Due to its low carbon and silicon content, the material 2.4602 does not tend to precipitate grain boundaries during welding or hot forming. This material is therefore used in the welded condition in many chemical processes with oxidising and reducing media. Due to its high chromium, molybdenum, nickel and tungsten content, the material 2.4602 is resistant to chloride ion attack. Alloy 22 is also characterised by excellent resistance in concentrated solutions of metallic, oxidising salts such as iron III and copper chloride. Alloy 2.4602 is also one of the few materials that is resistant to moist chlorine gas, hypochlorites and chlorine dioxide.
Mechanical properties
at 20°C
Hardness
HB
≤ 240
Yield point
Rp0,2
N / mm²
≥ 310
Tensile strength
Rm
N / mm²
690 - 950
Elongation
A5,65
≥ 45%
Modulus of elasticity
kN / mm²
206
Weldability
The material 2.4602 can be welded well using all common welding processes. However, TIG welding should be used to achieve optimum corrosion properties. The workpiece should be welded in a stress-free, metallically bright and dirt-free condition. Low heat input, targeted heat conduction and rapid heat dissipation are recommended. The temperature of the intermediate layers should not exceed 120°C. Annealing colours should be removed by brushing immediately after welding, i.e. while still warm.
Machinability
Machining should be carried out in a solution-annealed condition. Alloy 22 tends to work harden. Therefore, a low cutting speed and a low feed rate should be selected. The tool should be in constant engagement. A sufficient cutting depth should be selected so that the previously created work-hardened zone can be undercut. To ensure a stable cutting process, heat dissipation should be optimised by using large quantities of suitable, water-based cooling lubricants.
Cold forming
Cold forming should be carried out in the solution-annealed condition. The material 2.4602 has a significantly higher work hardening rate than most austenitic stainless steels. Intermediate annealing should be carried out for severe cold forming. If the degree of deformation is greater than 15%, a final solution annealing should be carried out.
Thermal treatment
| Solution annealing | |
|---|---|
| Hot forming | 1100 - 900°C |
| Cooling down | quickly with water or air |
| Solution annealing | |
|---|---|
| Hot forming | 1100 - 900°C |
| Cooling down | quickly with water or air |
Physical properties
Density
at 20°C
kg/dm³
8,70
Electrical
Resistance at 20°C
(ohm) mm²/m
1,21
Melting range
1360 - 1400°C
Thermal conductivity
at 20°C
W/m K
9,4
Specific
Heat capacity
at 20°C
J/kg K
406
Markets & Applications
Chemistry
Oil and Gas
Offshore
Environmental technology
Flue gas desulphurisation systems
Our
Delivery programme
Frequently asked questions
Important note
TEAM EDELSTAHL operates purely as a trading company without technical staff. Consequently, we are not authorised to provide material consulting services.
The above values and information on the properties and/or usability of the material are purely informative. This information is based on the experience of the manufacturer and TEAM EDELSTAHL. All information is without guarantee. Misprints, errors and changes excepted.
