Outokumpu 4724
The two lower alloyed grades are best suited for temperatures between 550°C and 850°C, at which most HT austenitic stainless steels are prone to form brittle phases. The higher alloyed ones are applied at temperatures up to 1150°C and show excellent resistance against reducing sulphur attacks and molten metals.
Due to their ferritic structure, the ferritic steels show lower strength at temperatures exceeding 600°C, but are more resistant to thermal shocks than HT austenitic stainless steels. With the thermal conductivity higher and the thermal expansion lower than the respective values for austenitic steels, equal thermal shocks will result in lower thermal stresses in the ferritic material. In these terms, ferrites allow greater tolerances for design and operation.
All grades are included in the European Standard EN 10095 "Heat-resisting steels and nickel alloys".
4724 is a truly stainless high temperature grade with 13% chromium. It is not critical in terms of embrittlement.
General Properties
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Technical Datasheet (English)
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