Forta 316Ti/4571
EN 1.4571, ASTM TYPE 316TI / UNS S31635

General characteristics

Forta 317Ti/4571 is a titanium-stabilized, molybdenum-alloyed austenitic steel for highly corrosive environments, including applications in elevated temperatures.

Typical applications

  • Heating technology
  • Profiles
  • Railway tanks


Product forms, available sizes and finishes


Product typeFinishesThicknessWidth
Cold rolled coil and sheetWork hardened0,80-5,50≤ 1500
Chemical composition

The typical chemical composition for this grade is given in the table below, together with composition limits given for the product according to different standards. The required standard will be fully met as specified on the order.

The chemical composition is given as % by mass.

TypicalForta 316Ti/45710.0416.810.92.1Ti
ASTM A240/A240MTYPE 316TI / UNS S31635<0.08<216.0-18.010.0-14.02-3.0<0.10Si:<0.75 P:<0.045 S:<0.030 Ti
EN 10088-21.4571<0.08<216.5-18.510.5-13.52-2.50Si:<1 P:<0.045 S:<0.015 Ti
Mechanical properties

StandardGradeRp0.2Rp1.0RmImpact strengthRockwellHBHV
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)Forta 316Ti/457128531061580HRB
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)Forta 316Ti/4571295345595170
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)Forta 316Ti/4571260300570

1)Elongation according to EN standard:
A80 for thickness below 3 mm.
A for thickness = 3 mm.
Elongation according to ASTM standard A2” or A50.


Corrosion resistance

Pitting corrosion resistanceCrevice corrosion resistance

PRE Pitting Resistant Equivalent calculated using the formula: PRE = %Cr + 3.3 x %Mo + 16 x %N
CPT Corrosion Pitting Temperature as measured in the Avesta Cell (ASTM G 150), in a 1M NaCl solution (35,000 ppm or mg/l chloride ions).
CCT Critical Crevice Corrosion Temperature is the critical crevice corrosion temperature which is obtained by laboratory tests according to ASTM G 48 Method F



Physical properties

Physical properties according to EN 10088 are shown below.


DensityModulus of elasticityThermal exp. at 100 °CThermal conductivityThermal capacityElectrical resistanceMagnetizable

*) Austenitic stainless steel grades may be magnetizable to a certain degree after cold deformation, e.g. in temper rolled condition.


More detailed information concerning welding procedures can be obtained from the Outokumpu Welding Handbook, available from our sales offices.


Standards & approvals

The most commonly used international product standards are given in the table below.


ASTM A240/A240MTYPE 316TI / UNS S31635
EN 10088-21.4571