Forta H500

General characteristics

Outokumpu grade Forta H500 is a fully austenitic high strength steel. Depending on the degree of work hardening, the Outokumpu grades Forta H800 and Forta H1000 can be derived.


Its outstanding mechanical properties, combining a high amount of yield strength with a good formability, result in a very high lightweight construction potential. This lightweight potential, as well as its excellent CO2 footprint make the grade ideal for a wide range of transportation (e.g. truck, bus, railway vehicles) but mainly automotive applications as an alternative for aluminium and high strength carbon steels in structural components, especially crash-relevant parts. Additionally, its price stability due to the reduction of nickel makes this grade even more attractive for the use in large-scale production applications.

Typical applications

  • Crash-relevant structural components
  • Formed parts with lightweight potential
  • Parts made of light-gauge sheet
  • Parts targeting innovative production processes (e.g. hydroforming, roll forming)

 

Product forms, available sizes and finishes

Flat

Product typeFinishesThicknessWidth
Black hot band1U3,50-12,701000-1600
Cold rolled coil2B0,60-4,001000-1350
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 
Mechanical properties

Depending on the degree of work hardening, due to the TWIP-effect, different pairings of strength and elongation after fracture (typically between Rp 0,2 / Rm / A80 = 530 MPa / 900 MPa / 51 % and up to 1000 MPa / 1200 MPa / 13 %) can be achieved according to the customer demand.


Outokumpu name Rp0,2 Rm Elongation after fracture HV
Typical (Thickness 1,5 mm) MPa MPa %  
Forta H500 530 900 51 300
Forta H800 800 1000 31 350
Forta H1000 1000 1200 13 400

 

StandardRp0.2Rp1.0RmElongationImpact strengthRockwellHBHV
 MPaMPaMPa%J
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)530900300

 

Corrosion resistance

Low electrochemical potential prevents galvanic corrosion with carbon steels in multimaterial construction


To further enhance corrosion behaviour, the material has to be protected by electrophoretic coating


A further zinc coating is not necessary


The Outokumpu automotive technical customer service should be contacted for detailed information on corrosion behavior for specific applications.

Pitting corrosion resistanceCrevice corrosion resistance
PRECPTCCT
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

 

 

DensityModulus of elasticityThermal exp. at 100 °CThermal conductivityThermal capacityElectrical resistanceMagnetizable
kg/dm3GPa10-6/°CW/m°CJ/kg°CµΩm
7,820016,312,5No
Fabrication

The grade can be formed using typical forming processes like folding, bending, drawing etc.

  • Grade has significantly higher proof strength than standard austenitic stainless steel grade 1.4301 / AISI 304 due to higher work hardening with a coexistent good ductility.
  • Its characteristics mean excellent formability also in expansion mode, which makes the grade appropriate for innovative forming and production processes like hydroforming and roll forming

 

Conventional welding methods are applicable, austenitic filler metals can be used.

  • Austenitic filler metals can be used
  • Every type of shielding gas can be used
  • Conventional weld seam post treatments can be used (e.g. polishing, brushing, blasting)

 


More detailed information concerning forming, machining and welding procedures can be obtained from the Outokumpu automotive technical customer service contacts.

Standards & approvals

The steel grade currently runs through the material evaluation process according to SEP 1240 / 1245 / 1220.

Work is in progress for EN standardization.

 

StandardDesignation