410 Fabricating Properties

Alloy 410 should be machined in the annealed condition using surface speeds of 60 to 80 feet (18.3 – 24.4 m) per minute.

Surface Preparation

For maximum corrosion resistance to chemical environments, it is essential that the stainless steel surface be free of all heat tint or oxide formed during forging, annealing, or heat treating. All surfaces must be ground or polished to remove any traces of oxide and surface decarburization. The parts should then be immersed in a warm solution of 10-20% nitric acid to remove any residual iron. A thorough water rinse should follow the nitric acid treatment.

Structure

In the annealed condition, Alloy 410 consists of ferrite and carbides. When this alloy is heat treated at high temperature [1800°F-1950°F (982-1066°C)], austenite will form and transform to martensite upon cooling to room temperature. The hardness of the martensite will increase with increasing carbon content to a point where the martensite becomes saturated with carbon. Carbon also combines with carbide formers such as chromium to form chromium carbides which are dispersed throughout the microstructure to provide added wear resistance, as does higher hardness.

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