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Heat Resistant Alloys

Heat Resistant Alloys

We supply a comprehensive range of heat resistant alloys, making NeoNickel the ideal choice for companies that work in high temperature environments.

Our heat resistant alloys are used in a wide range of applications offering high temperature corrosion resistance in the following environments:

Heat resistant alloys are commonly used where applications require resistance to Thermal Cycling, Creep, Stress Rupture and High Temperature Strength.


NeoNickel offers in depth technical data based upon many years’ experience gained from working with our customers. We develop material solutions for a wide variety of high temperature applications.

Introduction to the NeoNickel range of heat resistant alloys

Alloy 321 is a Titanium stabilised austenitic stainless steel commonly used for service in 540°C to 870°C temperature range. Oxidation resistant to 870°C.

For service temperatures around 870°C, a stabilising treatment at 844°C – 900°C, air cool, may be used to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking.

Alloy 347 has a slightly improved corrosion resistance compared with 321 stainless in strongly oxidising environments. Alloy 347 is stabilised with Niobium. It is preferable for aqueous corrosion and low temperature environments due its good resistance to intergranular attack.

Both 347 and 321 offer good resistance to polythionic acid stress corrosion cracking, encountered at refineries. High temperature oxidation resistance coupled with good creep strength up to 816°C.

An austenitic stainless steel with good oxidation resistance to 1038°C. When frequent cycling is involved, the alloy is oxidation resistant to 1010°C.

Alloy 309/309S is not recommended for highly carburising environments.

Good sulphidation resistance with moderate strength at high temperatures.

An austenitic stainless steel with higher Chromium and Nickel content than other high temperature austenitic stainless grades. Excellent resistance to oxidation up to 1094°C.

Good resistance to sulphidation and other forms of high temperature corrosion. 310S is widely used in moderately carburising atmospheres encountered in petrochemical environments.

In more severe carburising atmospheres in the heat treatment furnaces RA330® or RA333® are used. Alloy 310S is often used at cryogenic temperatures down to – 235°C

An advanced micro alloyed austenitic stainless steel with the addition of Cerium. The alloy has superior strength to other austenitic stainless grades. It has twice the strength of 309/309S and 310S stainless above 870°C and excellent oxidation resistance up to 1094°C.

253 MA® can decrease distortion and increase the service life of your equipment.

253 MA® is established as the alloy of choice for the construction of pyrolysis vessels in biomass and waste to energy plants.

The workhorse of the austenitic heat resistant alloys. With a high melting point, the alloy demonstrates good strength combined with outstanding carburisation and oxidation resistance up to 1150°C.

These properties are enhanced by a nominal 1.25% Silicon addition.

RA330® has been designed to withstand the thermal shock of liquid quenching. This alloy finds wide application in high temperature industrial environments, where good resistance to the combined effects of carburisation and thermal cycling is a prime requisite.

RA330® remains fully austenitic at all temperatures and is not subject to embrittlement from sigma phase formation.

An austenitic heat resistant alloy designed for use in high temperature structural applications. The strength of 800H/HT is achieved by controlled levels of Carbon, Aluminium and Titanium along with an 1148°C minimum anneal to achieve a grain size of five or coarser. High temperature oxidation resistance up to 982°C

A Nickel-based alloy with excellent carburisation resistance and good oxidation resistance at elevated temperatures up to 1095°C.

Alloy 600 has useful resistance to dry chlorine and HCL gases at moderately elevated temperatures.

Good resistance to caustic soda at elevated temperatures and virtually immune to chloride ion stress corrosion cracking.

A Nickel-Chromium alloy with excellent resistance to oxidation up to 1205°C.
Alloy 601 develops a highly adherent Chromium oxide scale, which resists spalling even under severe thermal cycling conditions.

Alloy 601 has good high temperature strength (creep and rupture), retains its ductility after long service exposure and has excellent metallurgical stability.

One of the most oxidation resistant alloys available today with outstanding oxidation resistance up to 1232°C.

Alloy 602 CA® has high creep strength up to 1232°C with creep data available to 1176°C. This alloy has little to no grain growth at high temperature.

A Nickel based superalloy with excellent carburisation, oxidation and hot corrosion resistance.

RA333® has high creep rupture strength with an exceptional ability to withstand thermal shock. This alloy has good long term oxidation resistance up to 1205°C.

At NeoNickel, we aim to provide you with the right products and services that are suitable for your requirements.