Therma range | Heat-resistant stainless steels | 321 | 310 | 309

Therma range contains heat-resistant stainless steels for use in applications with high service temperatures. This product has excellent oxidation and creep resistance.

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Outokumpu Therma grades

Key products
Resistance to sulfur
Resistance to carburizing and nitriding

For High Service Temperatures

Therma

The Therma range contains heat- and creep-resisting stainless steels with excellent oxidation and creep resistance for use in applications with high service temperatures (≥ 550°C/1020°F).

Austenitic heat- and creep-resisting stainless steels have resistance to carburizing and nitriding/low oxygen hot gas and higher creep strength, in general.

Therma 253 MA/4835 (EN 1.4835) is an austenitic heat-resisting stainless steel with excellent oxidation and creep resistance in cyclic conditions and is best employed in high temperatures up to 1100°C/2012°F.

Therma 310S/4845 (EN 1.4951) is an austenitic heat- and creep-resisting stainless steel with excellent oxidation resistance in mildly cyclic conditions and is best employed in high temperatures up to 1050°C/1920°F.

The ferritic heat-resisting stainless steels Therma 4713 (EN 1.4713) and Therma 4724 (EN 1.4724) have good resistance to sulfur-containing hot gases and lower thermal expansion compared to nickel-alloyed grades. Therma 4713 and Therma 4724 are best employed in temperatures up to 800°C/1470°F and 850°C/1560°F, respectively

High temperature stainless steels are vital for applications exceeding 550 °C, with some grades enduring up to 1150 °C. These materials are crucial in industries such as iron, steel, metallurgy, general engineering, energy plants, and cement. Selecting the optimal grade ensures safety, reliability, and longevity, considering factors like corrosion resistance, mechanical properties, microstructural stability, and physical properties. Visit the landing page and download the white paper to learn more.

Standards and approvals

EN 10028-7	Flat products for pressure purposes – Stainless steels
EN 10088-1	Stainless steels – Part 1: List of stainless steels
EN 10088-2	Stainless steels – Corrosion resisting sheet/plate/strip for general and construction purposes
EN 10088-3	Stainless steels – Corrosion resisting semi-finished products/bars/rods/wire/sections for general and construction purposes
EN 10088-4	Stainless steel flat products, technical delivery conditions, steels for constructions
EN 10217-7	Welded steel tubes for pressure purposes – Stainless steel tubes
EN 10296-2	Welded circular steel tubes for mechanical and general engineering purposes - Stainless Steel tubes
ASTM A182 / ASME SA-182	Forged or rolled alloy-steel pipe flanges, forged fittings etc. for high temperature service
ASTM A240 / ASME SA-240	Heat-resisting Cr and Cr-Ni stainless steel plate/sheet/strip for pressure purposes
ASTM A276	Stainless and heat-resisting steel bars/shapes
ASTM A479 / ASME SA-479	Stainless steel bars for boilers and other pressure vessels
Eurocode 3 / EN 1993-1-4	Design of steel structures – Part 1-4: General rules – Supplementary rules for stainless steels
ISO 15510	Stainless steels – chemical composition