High Silicon Cast Iron Anode Plate

This plate-shaped high silicon cast iron anode is specially designed to replace the sled anode used for protecting the sub-sea steel structures. It increases the discharge surface and changes the current path to improve the uniformity of discharge.



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Centrifugal Casting Process

Our solid high silicon cast iron anodes are centrifugal chill cast. The casting mold rotates at over 1000rpm producing a g-force that eliminates any trapped gas from silicon iron and throws any impurities to the inside bore of the anode where they do not hinder anode performance. Hence, the metal matrix is tight and dense; increasing the life of the anode.

Compact Structure

Due to the consistent weight and greater density of the anode, there is less flake grain boundaries and lower chemical segregation. No gas porosity, no internal shrinkage and no non-metallic inclusions.

Chemical Composition

Element ASTM A518 / A518M Grade 1 (Si – Fe) ASTM A518 / A518M Grade 3 (Si – Fe – Cr) BS 1591 1975
Silicon (Si) 14.2% ~ 14.75% 14.2% ~ 14.75% 14.25 ~ 15.25%
Chromium (Cr) 0.5% max. 3.25% ~ 5.0% 0.5% max.
Manganese (Mn) 1.5% max. 1.5% max. 0.5% max.
Copper (Cu) 0.5% max. 0.5% max.
Molybdenum (Mo) 0.5% max. 0.2% max.
Carbon (C) 0.65% ~ 1.1% 0.7% ~ 1.1% 1.4% max.
Phosphorus (P) 0.25% max.
Sulphur (S) 0.1% max.
Iron (Fe) Remainder Remainder Remainder

Note: ASTM A518 Grade 3 chemistry is particularly suited for more severe environments(such as brackish water or saltwater), where the level of chromium is elevated to enhance anode performance.

Main Technical Parameters


High Silicon Cast Iron




Ø78.7”x3.15” (Ø2000×80 mm)



Current Density

1 ~ 5 A/ft² (10 ~ 50 A/m²)

Consumption Rate

0.7 ~ 1 lbs/A.y (0.3 ~ 0.5 kg/A.y)


Offshore Platform


We employ ISO 9001:2015 quality management system and rigorous internal testing standards to ensure the optimum lifespan and performance of our anodes. Each anode is labelled with a unique serial number for quality tracking.

Testing Details Chemical Composition Electrochemical Performance Physical Properties
Testing Standard ASTM E350 ASTM E186/E446 Foundry ITP
Testing Items Chemical Analysis Current Efficiency / Connection Resistance Dimension & Weight / Surface Finish / Cable Connection / Lead Wire Pulling Tension / Epoxy Resin Sealing
Equipments Optical Emission Spectrometer Labspark 750A / Thermoscientific Niton XL2-980 Electrochemical Analyzer EPI 200 Calibrated Digital Measuring Devices

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