Forta 301LN/4318
EN 1.4318, ASTM TYPE 301LN / UNS S30153

General characteristics

Forta 301LN/4318 is a low-carbon, nitrogen-alloyed alternative to Forta 301/4310 with elevated strength, making it particularly suitable for lightweight construction applications.

Typical applications

  • Vehicle chassis
  • Profiles


Product forms, available sizes and finishes


Product typeFinishesThicknessWidth
Cold rolled coil and sheetWork hardened0,70-6,35≤ 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 301LN/43180.0217.76.50.14
ASTM A240/A240MTYPE 301LN / UNS S30153<0.030<216.0-18.06.0-8.00.07-0.20Si:<1 P:<0.045 S:<0.030
EN 10088-21.4318<0.030<216.5-18.56.0-8.00.10-0.20Si:<1 P:<0.045 S:<0.015
Mechanical properties


StandardGradeRp0.2Rp1.0RmImpact strengthRockwellHBHV
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)Forta 301LN/431836040075089HRB
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)Forta 301LN/431835040074090
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)Forta 301LN/4318345380750

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

The physical properties of the available products are given in the table 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 301LN / UNS S30153
EN 10088-21.4318