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	–