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Materials

This page details selected properties of some of the materials that we use in the manufacture of igniter systems. The page is split into the following sections:

Stainless Steel

We frequently use four grades of stainless steel; 304L, 303KX, 310 and 316. These are austenitic grades from the 18/8 range of stainless steels. 

304L is based on 302 grade but is less susceptible to inter-granular corrosion due to its lower carbon content. Other elements are 18% chrome, 8% nickel and the balance is iron. It is used for stainless steel mixture tubes.

303KX is a variant of 304 grade. Sulphur or selenium is added, making it easier to machine. It is used for stainless steel conductor rods.

310 is 25% chrome, 20% nickel and was developed for high temperature service where high creep strength is needed. It is used for burner heads on applications that will be subjected to high temperatures.

316 contains molybdenum and is designed for applications involving severe corrosion conditions. It is widely used to manufacture stainless steel fittings.

Physical Properties

    304L 303KX 310 316
Density g/cm3        
Melting point deg C 1400   1400 1370
Safe scaling temperature for continuous service in oxidizing atmosphere. deg C 900   1150 900

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Alloy 800HT

Alloy 800HT is a heat resisting alloy and is is used for the burner head on applications that will be subjected to prolonged high temperatures. 

Composition

  Ni C Cr Fe Mn Al Si S Ti
% max   0.1 23 bal 0.6 0.6 0.6 0.015 0.6
% min 31 0.06 19   0.2 0.3 0.2   0.3

Physical Properties

 

Density 

g/cm3

8

Curie temperature deg C -115
Melting temperature deg C 1350

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Kanthal A1

Kanthal A1 is a heat resisting ferritic FeCrAl alloy and we use it for electrodes that will be exposed to high temperatures for long periods. The properties listed below are those most relevant to applications on ignition equipment. Contact Kanthal for more information.

Composition

   C % Si % Mn % Cr % Al % Fe %
Nominal Composition          5.8 Balance
Min - - - 20.5 -  
Max 0.08 0.7 0.4 23.5 -  

Physical Properties

Density

g/cm3

7.10

Melting point deg C 1500
Max continuous operating temperature in air  deg C 1400
Curie Temperature

 deg C

600

 

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Page last revised 5th September 2001