Materials database

Heat-resistant austenitic stainless steel with 25% Cr and 21% Ni for outstanding oxidation resistance up to 1150°C in continuous service. Higher Si content (1.5-2.5%) enhances scaling resistance. Used for furnace parts, heat treatment baskets, muffles, radiant tubes, burner nozzles, thermocouple sheaths, and kiln furniture. The standard material for furnace construction. Similar to AISI 310/314. Not recommended for sulphur-containing atmospheres.

Heat-resistant duplex (austenitic-ferritic) stainless — 25Cr-4Ni-1.5Si. Si addition improves oxidation resistance at high temperature. Used for furnace components, burner nozzles, heat treatment fixtures, and kiln supports operating at 800-1000°C. Higher strength than fully austenitic heat-resistant grades at intermediate temperatures due to duplex structure.