Materials

1.4571 | AISI 316 Ti

1.4571 or AISI 316 Ti is a titanium-stabilized austenitic stainless steel for increased requirements in corrosion and temperature resistance.
The material is particularly suitable for chemical plants, maritime applications and thermally stressed systems where intergranular corrosion must be avoided.
AISI 316 Ti combines the advantages of AISI 316 with improved stability at higher temperatures and longer service life.

Materials

Normen und Bezeichnungen

EN	DIN	AISI	UNS
1.4571	X6CrNiMoTi17-12-2	316Ti	S31635

Materials

Chemische Zusammensetzung

%	C	Mn	Si	P	S	Cr	Ni	Mo	Ti
min.	-	-	-	-	-	16,5	10,5	2,0	5xC
max.	0,08	2,0	1,0	0,045	0,03	18,5	13,5	2,5	0,70

Materials

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Corrosion resistance	Workability	Forgeability	Weldability	Machinability
★★★	★★☆	★★★	★★★	★☆☆

Density kg/dm³	Electrical resistivity Ω in mm²/m	Thermal conductivity W/m K	Specific heat capacity J/kg K	Magnetizability
8,0	0,75	15	500	★☆☆

Hardness HB	Yield strength Rp N/mm²	Tensile strength Rm N/mm²	Elongation A5 in %	Elastic modulus kN/mm²
≤ 215	≥ 200	500 - 700	≥ 40	200

Cold forming	Solution annealing	Cold heading	Hot forming	Polishability
suitable	1020 - 1120°C	suitable	900 - 1200°C	not suitable

Materials

Eigenschaften von AISI 316 TI im Detail

Detail

Weldability

The weldability of 1.4571 is excellent. The titanium addition significantly reduces the risk of carbide precipitation during welding, which in turn greatly lowers the likelihood of intergranular corrosion. The material is weldable with all common welding processes and generally does not require post-weld heat treatment. It can be welded with or without filler metal. Heat tint may form during welding and must be removed using chloride-free chemical or mechanical methods.

Detail

Machinability

The machinability of 1.4571 is poor. The titanium addition increases tool wear and hardness compared with similar alloys such as 1.4401 or 1.4404. Carbide tools and adjusted cutting speeds are therefore particularly important.

Detail

Forgeability

1.4571 has good forgeability. It is typically preheated to 1150–1180°C and forged in the range 950–1180°C. Subsequent cooling is performed in air or water.

Detail

Magnetizability

Due to its austenitic structure, 1.4571 is non-magnetic, although slight magnetic response can be induced by certain post-treatments.

Detail

Corrosion resistance

1.4571 offers very good corrosion resistance. The additions of molybdenum and titanium improve stability and resistance to aggressive environments. This provides excellent protection against intergranular corrosion and good resistance to natural and low-salinity or low-chloride environments. However, the material is susceptible to seawater, so its use in marine environments is limited.