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|Ferritic Grades:||1.4713 1.4724 1.4742 1.4749 1.4762 Stainless||Material:||Heat Resisting 1.4713 1.4724 1.4742 1.4749 1.4762 Stainless Steel Sheet And Plate|
stainless strip steel,
1.4028 stainless steel
Heat Resisting 1.4713 1.4724 1.4742 1.4749 1.4762 Stainless Steel Sheet And Plate
The high temperature (HT) ferritic stainless steels complement Stainless austenitic heat and creep portfolio.
The main alloying element in the ferritic grades is chromium. Its positive effect on the scaling resistance is
enhanced by silicon and aluminium. 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”.
1.4713 does not form brittle phases but should only be exposed to moderately corrosive atmospheres
owing to its low chromium content.
1.4724 is a truly stainless high temperature grade with 13% chromium. It is not critical in terms of embrittlement.
1.4742 shows better scaling resistance than 4724 and can be subjected to reducing sulphur environments
without risk. It is subject to 475°C embrittlement and grain coarsening at temperatures above 950°C.
σ-phase may form after long time exposures to temperatures around 650°C.
1.4762 - with the highest chromium content- is the most resistant to reducing sulphurous gases.
It is susceptible to the same embrittlement phenomena as 4742 whilst σ-phase forms during long
exposures in the range 600°C to 800°C.
High temperature ferritic stainless steel grades
Stainless ferritic high temperature steels are mostly used in high temperature applications with sulphurous
atmospheres and/or low tensile loads such as for installations within:
|Grade||Max service temperature in dry air, ℃|
Contact Person: Paul Lu