Ferritic

This group contains a minimum of 17% chrome and carbon in the range of 0.08% - 2.00%. The increase in chromium imparts increased resistance to corrosion at elevated temperatures, but the lack of mechanical properties due to the fact that it cannot be heat treated, limits its applications. Like martensitics they are magnetic and the welding of this group should be carried out with the necessary precautions.

Type 430F (BS EN 10088 1.4105)

A 17% chrome, low alloy ferritic steel that is non-hardenable and possessing only mild cold working properties due to the high chrome content. This alloy possesses good corrosion resistance up to a temperature of approximately 800°C. It's lack of tensile properties, and poor usability, limit its applications and as a result is usually found in strip and sheet form.