Sandvik 5R60 (Wire)

Chemical composition (nominal) %

Forms of supply

Sandvik 5R60 ESP for dynamic Electrostatic Precipitators 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 5R60 ESP is tested and certified in accordance with a minimum nominal tensile strength. Proof strength is in the range of 85% of the tensile strength.

Physical properties

Density: 8.0 g/cm³, 0.29 lb/in³
Specific heat capacity, at 20^oC (68^oF): 485 J/kg^oC, 0.12 Btu/lb h^oF
Thermal expansion: 30 - 100^oC, 16.5 *10^-6/^oC, 86 - 210^oF, 9.5 *10^-6/^oF
Thermal conductivity, at 20^oC (68^oF): 15 W/m^oC, 9 Btu/ft^. h ^oF
Permeability,at 20^oC (68^oF): 1.004
Resistivity,at 20^oC (68^oF): 0.80 mWm, 31 mWin.
Modulus of elasticity, at 20^oC (68^oF): 180 000 MPa, 26 100 ksi

Corrosion resistance

General corrosion

Sandvik 5R60 ESP has good resistance in:

• Organic acids at high concentrations and moderate temperatures
• Inorganic acids, e.g. phosphoric and sulphuric acids, at moderate concentrations and temperatures. The steels can also be used in sulphuric acid of concentrations above 90% at low temperature.
• Salt solutions, e.g. sulphates, sulphides and sulphites
• Caustic environments.

The risk of general corrosion in sulphuric acid during shut down periods has to be taken into account. In naturally aerated sulphuric acid the corrosion rate is below 0.1 mm/year provided the temperature is not higher than 50°C in 10% solution.

Pitting and crevice corrosion

Resistance to these types of corrosion improves with increasing molybdenum content. Sandvik 5R60 ESP, containing about 2.6% Mo, has substantially higher resistance to attack than steels of type AISI 304 and also better resistance than ordinary AISI 316 steels with 2.1 % Mo.

Stress corrosion cracking

Austenitic steels are susceptible to stress corrosion cracking. This may occur at temperatures above about 60 °C (140 °F) if the steel is subjected to tensile stresses and at the same time comes into contact with certain solutions, particularly those containing chlorides. Such service conditions should therefore be avoided. Conditions when plants are shut down must also be considered, as the condensates which are then formed can develop conditions that leads to both stress corrosion cracking and pitting.

In applications demanding high resistance to stress corrosion cracking, Sandvik Springflex ESP is recommended.

Gas corrosion

Sandvik 5R60 ESP can be used in

• Air up to 850 °C (1560 °F)
• Steam up to 750 °C (1380 °F)

Creep behaviour should also be taken into account when using the steel in the creep range.

In flue gases containing sulphur, the corrosion resistance is reduced. In such environments the steel can be used at temperatures up to 600-750 °C (1110-1380 °F) depending on service conditions. Factors to consider are whether the atmosphere is oxidizing or reducing, i.e. the oxygen content, and whether impurities such as sodium and vanadium are present.