General Information

Viewing the microstructure respectively the chemical analysis the heat-resistant steels can be divided in the group of ferritic, martensitic, austenitic steels and nickel alloys.

Such steels are generally used in applications where resistance to increased temperatures are critical. These steels are hard wearing and offer a resistance to large variations in temperature. Industrial applications include furnaces, heat exchanges and incinerators where temperatures can reach up to 1100°C.

Characteristics include corrosive resistance, creep resistance, oxidation resistance and hydrogen brittleness – all under extremely high temperatures.

Creep resistant steels are steels designed to withstand a constant load at high temperatures.

The most important application of creep resistant steels is components of steam power plants operating at elevated temperatures (boilers, turbines, steam lines).


Alloy BÖHLER brand WstNo. UNS ISO AMS ASTM Others
403 T655 1.4006 X12Cr13 403
403Cb T656 12%Cr 403Cb
420 T651 1.4021 X20Cr13 420
T602 1.4120, ~ 1.4921 X19CrMo12-1
Alloy FV520, 520B T670 1.4594 S45000 X5CrNiMoCuNb14-5
Alloy 450 T671SA, T671SB 1.4594 S45000 X5CrNiMoCuNb14-5 ~XM25
H500 1.4876 X10NiCrAlTi 32-21 B564
COST E T505SC 1.4906 X12CrMoWVNbN10-1-1
T560 1.4913 X19CrMoNbVN11-1 ~BS: S150
T550 1.4922, 1.4923, 1.4926, 1.4934 X20CrMoV12-1, X22CrMoV12-1, X21CrMoV12-1 STN: 17 134
Jethete M152 T552 1.4933, 1.4938, 1.4939 S64152 X12CrNiMo12 5719 BS: S151
422 T504 ~1.4935 12%Cr 422, 661
A286 T200 1.4943, 1.4944, 1.4980, 1.2779, 1.3980 S66286 X4NiCrTi25-15, X5NiCrTi26-15 5731, 5732 A660 AISI: 660
 – T240 1.4962 X12CrNiWTi16-13
 – T262 1.4986 X8CrNiMoBNb16-16
314 H525 1.4841 S31400 X15CrNiSi25-20 AISI 314
Alloy 800 (H, HT, HP) H500 1.4876, 1.4959, 1.4958 N08810, N08811 X10NiCrAlTi32-21 B408, B564
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