Forta 316L/4404
EN 1.4404, ASTM TYPE 316L / UNS S31603

View Forta range datasheet

General characteristics

A low-carbon, molybdenum-alloyed alternative to Supra 316/4401 that is widely used for various applications with higher than average corrosion resistance requirements. Forta 316L/4404 is strengthened with temper rolling for applications that require specific strength as well as improved weldability and intergranular corrosion resistance.

Typical applications

  • Automotive components
  • Tanks and vessels

 

Product forms, available sizes and finishes

Flat

Product typeFinishesThicknessWidth
Cold rolled coil and sheetWork hardened0,33-5,50≤ 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.

StandardGradeCMnCrNiMoNOther
TypicalForta 316L/44040.0217.210.12.1
ASTM A240/A240MTYPE 316L / UNS S31603<0.030<216.0-18.010.0-14.02-3.0<0.10Si:<0.75 P:<0.045 S:<0.030
EN 10088-21.4404<0.030<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
  MPaMPaMPaJ
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)Forta 316L/440430032562581HRB
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)Forta 316L/4404300350600170
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)Forta 316L/4404260300570

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
PRECPTCCT
2420±2<0

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
kg/dm3GPa10-6/°CW/m°CJ/kg°CµΩm
8.020016155000.75No*

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

Fabrication

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.

 

StandardDesignation
ASTM A240/A240MTYPE 316L / UNS S31603
EN 10088-21.4404