Forta 316/4401
EN 1.4401, ASTM TYPE 316 / UNS S31600, TYPE 316H / UNS S31609

General characteristics

A normal-carbon, molybdenum-alloyed stainless steel that is widely used for various applications with higher than average corrosion resistance requirements. Forta 316/4401 is strengthened with temper rolling for applications that require specific strength.

Typical applications

  • Automotive components
  • Tanks and vessels


Product forms, available sizes and finishes


Product typeFinishesThicknessWidth
Cold rolled coil and sheetWork hardened0,80-5,80≤ 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 316/44010.0417.210.12.1
ASTM A240/A240MTYPE 316 / UNS S31600<0.08<216.0-18.010.0-14.02-3.0<0.10Si:<0.75 P:<0.045 S:<0.030
ASTM A240/A240MTYPE 316H / UNS S316090.04-0.10<216.0-18.010.0-14.02-3.0Si:<0.75 P:<0.045 S:<0.030
EN 10088-21.4401<0.07<216.5-18.510.0-13.02-2.50<0.10Si:<1 P:<0.045 S:<0.030
Mechanical properties

The mechanical properties of the available products are given in the table below.

StandardGradeRp0.2Rp1.0RmImpact strengthRockwellHBHV
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)Forta 316/440130032563081HRB
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)Forta 316/4401300350600170
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)Forta 316/4401260300570

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


For a more detailed description of their corrosion resistance properties in different environments see Outokumpu Corrosion Handbook.

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 316 / UNS S31600; TYPE 316H / UNS S31609
EN 10088-21.4401