Super Duplex

Alloy 255 is a generic description of our unique Ferralium 255 super duplex stainless steel (DIN 1.4507, UNS S32550, ASTM F61).

CD3Mn is a cast product specification most closely aligning to the wrought super duplex stainless steel product UNS S32205.

CD4MCuN is a cast product specification most closely aligning to the wrought super duplex stainless steel product UNS S32550.

CD3MWCuN is a cast product specification most closely aligning to the wrought super duplex stainless steel product UNS S32760.

Impact toughness is the ability of a metal to withstand a suddenly applied shock load and is quantified by the amount of energy absorbed.

As they are an alloy of several different metals, the melting point of stainless steel happens over a temperature range.

The main advantage of duplex stainless steel is its ability to provide extremely cost-effective performance compared with other all alloys.

One of the main risks of failure for stainless steels is from chloride stress corrosion cracking, but duplex grades are generally resistant.

Heat treatment of duplex stainless steel is usually restricted to their initial production, in the form of solution annealing.

Ferrite content is a measure of the amount of ferrite in a steel. Ferrite is one form of microstructure that may exist within a steel.

Ferrite content in duplex stainless steels should be close to 50%, and within the range of 35-60%, in order to optimise their properties.

ASTM is the American Society for Testing and Materials, and A473 is the ‘Standard Specification for Stainless Steel Forgings’.