Forta 316/4401
EN 1.4401, ASTM 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

  • Chemical tanks

 

Product forms, available sizes and finishes

Flat

Product typeFinishesThicknessWidth
Cold rolled coil2H0,05-6,003-1530
Cold rolled sheet2H0,25-6,00100-1530
Precision strip2H0,05-1,503-630
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.

CMnCrNiMoNOther
Typical 0.0417.210.12.1
ASTM A240 ≤0.08≤2.0016.0-18.010.0-14.02.00-3.00≤0.10
ASTM A240 0.04-0.10≤2.0016.0-18.010.0-14.02.00-3.00
ASTM A666 ≤0.08≤2.0016.0-18.010.0-14.02.00-3.00≤0.10
EN 10028-7 ≤0.07≤2.0016.5-18.510.0-13.02.00-2.50≤0.10
EN 10088-2 ≤0.07≤2.016.5-18.510.0-13.02.0-2.5≤0.11
EN 10088-3 ≤0.07≤2.0016.5-18.510.0-13.02.0-2.5≤0.11
EN 10088-4 ≤0.07≤2.016.5-18.510.0-13.02.0-2.5≤0.11
EN 10088-4 -5MEK ≤0.07≤2.016.5-18.510.0-13.02.0-2.5≤0.11
IS 6911 ≤0.08≤2.0016.0-18.010.0-14.02.00-3.00≤0.10
IS 6911 0.04-0.10≤2.0016.0-18.010.0-14.02.00-3.00
Mechanical properties

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

StandardRp0.2Rp1.0RmImpact strengthRockwellHBHV
 MPaMPaMPaJ
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)300325630
ASTM A240 ≥ 205 ≥ 515 ≤ 217
ASTM A240 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
EN 10028-7 ≥ 240 ≥ 270530-680
EN 10088-2 ≥ 240 ≥ 270530-680
EN 10088-4 ≥ 240 ≥ 270530-680
IS 6911 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
IS 6911 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)300350600170
ASTM A240 ≥ 205 ≥ 515 ≤ 217
ASTM A240 ≥ 205 ≥ 515 ≤ 217
EN 10028-7 ≥ 240 ≥ 270530-680
EN 10088-2 ≥ 240 ≥ 270530-680
EN 10088-4 ≥ 240 ≥ 270530-680
IS 6911 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
IS 6911 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)260300570
ASTM A240 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
ASTM A240 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
EN 10028-7 ≥ 220 ≥ 260520-670
EN 10088-2 ≥ 220 ≥ 260520-670
EN 10088-4 ≥ 220 ≥ 260520-670
EN 10088-4 -5MEK ≥ 209 ≥ 247494.0-636.5
IS 6911 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
IS 6911 ≥ 205 ≥ 515 ≤ 95HRB ≤ 217
Product type: Wire rod
Typical190220500

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

 

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
kg/dm3GPa10-6/°CW/m°CJ/kg°CµΩm
8.020016.0155000.75No
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 316H / UNS S31609; TYPE 316H / UNS S31609
ASTM A666TYPE 316H / UNS S31609
EN 10028-7, PED 2014/68/EU1.4401
EN 10088-21.4401
EN 10088-31.4401
EN 10088-41.4401
IS 6911, AMENDMENT NO. 2ISS 316; ISS 316H