MIL-HDBK-1004/10
alloy of similar silicon and other alloy content has been developed.
The
chromium bearing alloy is now almost exclusively used.
High Silicon Chromium Bearing Cast Iron (HSCBCI). This material is
6.6.3
widely used for impressed current anodes. Being a metal it has much greater
mechanical strength than nonmetals such as graphite magnetite. However, due
to its low elongation under load it is brittle and should be protected from
both mechanical and thermal shock.
Specifications. The nominal composition of HSCBCI is as follows:
6.6.3.1
(conforms to ASTM Specification A518-GR.2)
PERCENT
ELEMENT
Silicon
14.50
Chromium
4.50
Carbon
0.95
0.75
Iron
Remainder
The typical mechanical and physical properties of HSCBCI are as follows:
Tensile strength
15,000 psi
Compressive strength
100,000 psi
520 Brinell
Specific gravity
7.0
2,300 EF
Melting point
72 Fohms/cu cm
Specific resistance
7.33 Fin./in./EF
Coefficient of expansion
The maximum acceptable resistance between the cable and the anode should be
0.01 ohms.
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