Sandvik 2RK66 (Wire)
Datasheet updated 2013-02-18 14:23:36 (supersedes all previous editions)
Sandvik 2RK66 is a high-alloy austenitic stainless steel of '904L' type for use in severe corrosive environments, including environments with high chloride content and acids. The grade is recommended for service in, for example, dynamic electrostatic precipitator environments.
Wire in Sandvik 2RK66 is manufactured with a bright, lustrous finish, which provides increased fatigue strength and better corrosion resistance over matt finished materials. Service temperature for Sandvik 2RK66 ESP is -200 to 300°C (-330 to 570oF). The grade has a PRE* value of minimum 34.
* PRE, Pitting Resistance Equivalent = % Cr + 3.3 x % Mo + 16 x % N
Standards
- ASTM 904L
- UNS N08904
- EN number 1.4539
- EN name X1NiCrMoCu25-20-5
- W.Nr. 1.4539
- SS 14 25 62
- BS 904S14
Chemical composition (nominal) %
|
C
max |
Si
|
Mn
|
P
max |
S
max |
Cr
|
Ni
|
Mo
|
Cu
|
|---|---|---|---|---|---|---|---|---|
|
0.020
|
0.4
|
1.8
|
0.015
|
0.010
|
20
|
25
|
4.5
|
1.5
|
Forms of supply
Sandvik 2RK66 for dynamic electrostatic precipitators (ESP) is supplied bright drawn and degreased, in continuous lengths, without welds, on metallic spools.
Dimensions
Standard dimension for the product is 2.70 mm.
Other dimensions can be manufactured on request.
Tolerances
Standard diameter tolerance: +/- 0.020 mm
Roundness tolerance: max 0.020 mm
Surface purity
Wire is supplied with a cleaned surface with a maximum chloride ions content of 0.2 mg/dm 2.
Mechanical properties
Sandvik 2RK66 for dynamic electrostatic precipitators (ESP) is tested and certified in accordance with a minimum nominal tensile strength. The proof strength is approximately 85 % of the tensile strength.
| Proof strength | Tensile strength |
|---|---|
| Rp0.2 | Rm |
| MPa | MPa |
| min | min |
| 830 | 975 |
Physical properties
Density: 8.0 g/cm3 (0.29 lb/in3)
| 30 - 100oC | 86 - 210oF |
|---|---|
| 15.5 x 10-6/oC | 8.5 x 10-6/oF |
| 12 W/m oC | 7 Btu in./ft2 h oF |
|---|
| 460 J/kg oC | in the temperature range 50 - 100oC |
|---|---|
| 0.11 Btu/lb oF | in the temperature range 120 - 210oF |
Resistivity: 0.94 μΩm (37.0 μΩin.)
Permeability: ≤1.004
Modulus of elasticity, E, MPa: 185 000*)
*) at 20oC
Corrosion resistance
General corrosion
In formic acid, high-alloy Sandvik 2RK66 shows better resistance than conventional steels of the ASTM 316L type, see figure 1.
Figure 1. Isocorrosion diagram 0.1 mm/year (4mpy) for Sandvik 2RK66 and ASTM 316L in formic acid.
Pitting
The high chromium and molybdenum contents of this steel make it very resistant to pitting. This has been verified by extensive practical experience of service involving chloride-bearing process solutions and seawater cooling. See Figure 2.
Figure 2. Mean values of critical pitting temperature (CPT) at 400 mV SCE and different Cl- concentrations (NaCl solutions), pH ~ 6
(1.8% Cl- corresponds to the chloride content of seawater).
Stress corrosion cracking
Ordinary austenitic steels of the ASTM 304 and 316 types are susceptible to stress corrosion cracking in chloride-bearing solutions at temperatures above about 60°C (140oF). At high temperatures, above about 100oC, chloride contents as low as in the ppm-range (10-4 %) are sufficient to cause stress corrosion cracking in these steels. A nickel content of 25% is sufficient to provide very good resistance under practical conditions.
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Sandvik materials.
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