Forta 301/4310
EN 1.4310, ASTM TYPE 301 / UNS S30100, TYPE 301L / UNS S30103

General characteristics

Forta 301/4310 ia a lower chromium and nickel variant of Core 304/4301 with high work hardening capacity. Used for items subject to high mechanical loading.

Typical applications

  • Springs
  • Automotive components
  • Cable connectors
  • Window frames
  • Commercial appliances


Product forms, available sizes and finishes
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 301/43100.1017.07.0
ASTM A240/A240MTYPE 301 / UNS S30100<0.15<216.0-18.06.0-8.0<0.10Si:<1 P:<0.045 S:<0.030
ASTM A240/A240MTYPE 301L / UNS S30103<0.030<216.0-18.06.0-8.0<0.20Si:<1 P:<0.045 S:<0.030
EN 10088-21.4310<0.08<116.0-18.0Si:<1 P:<0.040 S:<0.015
Mechanical properties


StandardGradeRp0.2Rp1.0RmImpact strengthRockwellHBHV
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)Forta 301/431030032577090HRB
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)Forta 301/431033036575090
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)Forta 301/4310285315785

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

Data according to EN 10088 is shown 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.



Standards & approvals



ASTM A240/A240MTYPE 301 / UNS S30100; TYPE 301L / UNS S30103
EN 10088-21.4310