Heat resistance of stainless steel materials
Are you interested in the heat resistance of stainless steel materials from the supplier AvecGlob? Here you will find the necessary information on this topic.
The role of individual elements in the index of heat resistance
Resistance to high temperature oxidation of stainless steels depends on the chromium content Most austenitic steels with a chromium content of at least 18% can be used at temperatures up to 870 ° C. Most martensitic and ferritic steels have a lower oxidation resistance and, therefore, lower useful operating temperatures.
Creep
High-temperature strength of materials is usually expressed through the strength of creep — the ability of the material to withstand distortions during prolonged exposure to high temperatures. In this respect, austenitic stainless steels are particularly effective.
Low-carbon versions of standard austenitic grades have a reduced strength at high temperature, so they are usually not used for structural applications at elevated temperatures.
Duplex stainless steels have good resistance to oxidation due to their high chromium content, but they tend to embrittle when exposed to temperatures above 350 ° C. At high temperatures, the strength of such steels is reduced.
Structural stability
Some stainless steels reduce their heat resistance at temperatures from 425 to 815 ° C, which leads to a significant reduction in corrosion resistance. At the same time, fragility is growing, which is accompanied by corresponding changes in the microstructure of the steel. An unfavorable microstructure can be changed by heating the steel to a temperature above the temperature range for the formation of brittle phases containing silicon. Therefore, silicon in stainless steels is usually replaced by nickel.
Supplier — AvekGlob company — offers to buy a range of rolled metal products, made of different grades of stainless steels. Products can be bought at a price formed on the basis of European and world standards. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.
Heat resistance of austenitic and ferritic grades
High temperature austenitic steels are commonly used in a number of applications where the temperature exceeds 550 ° C:
the equipment of metallurgical industry;
machine building;
power plants;
cement industry.
In stainless steels of the ferritic class, the main alloying element in ferritic grades is chromium. Its positive effect on the heat resistance is enhanced by silicon and aluminum. Ferritic stainless steels are best suited for temperatures from 550 to 850 ° C. At the same time, because of their structure, ferritic steels show lower strength at temperatures exceeding 600 ° C, but are more resistant to thermal shocks than austenitic stainless steels.
Heat-resistant ferritic grades of stainless steels are used in high-temperature applications with sulfur atmospheres and / or at low tensile loads — in equipment for chemical, power and metal processing industries, as well as in heating devices.
Supplier — AvekGlob Company — offers various types of rolled products from stainless steel of domestic and foreign production. The products are offered at affordable prices from the manufacturer. The supplier guarantees the timely delivery of products to any address specified by the consumer.