Cromaloy A


Cromaloy A

Ferritic Cromaloy A with Aluminium has a number of advantageous characteristics which benefit its use in high temperature heating applications:

·        The Aluminium oxide protective layer adheres tightly and provides protection against carburizing atmospheres.

·        A low density reduces weight requirements.

·        A high Specific Resistance allows for larger cross sectional areas which improves longevity.

·        compared with NiCr alloys.Cromaloy A has good resistance to Sulphurcorrosion at high temperatures when 

Physical and Mechanical Properties

 

Units

 

Maximum continuous operating temperature in air

°C

1280

Nominal composition

%

Cr 22

Al 5

Fe Bal.

Density at 20°C

g/cm³

7.25

Resistivity at 20°C

µWcm

135

Thermal conductivity at 20°C

W/mK

13.5

Specific heat capacity at 20°C

kJ/kgK

0.460

Melting point (approx.)

°C

1500

Tensile strength Rm, 0.5 mm wire – annealed

N/mm²

600

Elongation at break, 0.5 mm wire - annealed

%

> 20

Temperature dependant Factors for Cromaloy A

Reference temperature 20°C

Temp °C

200

400

500

600

800

1000

1200

Temp °F

392

752

932

1112

1472

1832

2192

Resistivity Factor

1.009

1.018

1.030

1.039

1.056

1.068

1.073

Coefficient of thermal

expansion (10-6/K)

11

12

12

13

14

15

 

The figures given in these tables represent nominal or typical values.

Information contained within this technical data sheet is based upon the general experience of Scott Precision Wire Ltd and is believed to be correct at the time of issue. 

No warranty is given or is to be implied from  the details above. 

Customers are advised to carry out independent tests in order to determine the suitability of any Scott Precision Wire Ltd product for an application.

 

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