Core 201/4618
EN 1.4618

General characteristics

Core 201/4618 is an austenitic stainless steel, which belongs to the austenitic low-nickel CrMn stainless steel family, in which manganese replaces part of the nickel that is normally alloyed to CrNi standard grades. This variant has low nitrogen content and copper alloying for improved forming properties.


Corrosion resistance of the austenitic CrMn grades is usually slightly below that of the austenitic CrNi standard grades. Core 201/4618 is used in applications where good formability and corrosion resistance are needed.

Typical applications

  • Household appliances & consumer goods
  • Kitchen utensils
  • Tableware
  • Cutlery
  • Pots & pans
  • Sinks & countertops
  • Indoor cladding
  • Window frames
  • Automotive applications

 

Product forms, available sizes and finishes

Flat

Product typeFinishesThicknessWidth
Cold rolled coil2B, 2BB, 2C, 2D, 2E, 2G, 2J, 2R0,05-3,003-1530
Cold rolled sheet2B, 2BB, 2D, 2E, 2G, 2J, 2R0,40-3,00600-1530
Hot rolled coil, pickled1C, 1D, 1G, 1U2,00-8,0050-1550
Precision strip2R0,05-1,503-649
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 0.067.916.64.6Cu:1.7
EN 10088-2 ≤0.105.5-9.516.5-18.54.5-5.5≤0.15Cu:1.00-2.50
Mechanical properties

 

 

StandardRp0.2Rp1.0RmElongationImpact strengthRockwellHBHV
 MPaMPaMPa%J
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)310335640
EN 10088-2 ≥ 230 ≥ 250540-850 ≥ 45
Product type: Hot rolled coil and sheet
EN 10088-2 ≥ 230
Product type: Hot rolled quarto plate
EN 10088-2 ≥ 210 ≥ 240520-830 ≥ 45

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

Core 201/4618 has excellent corrosion resistance in solutions of many halogen-free organic and inorganic compounds over a wide temperature and concentration range. It can withstand many organic and sufficiently diluted mineral acids depending on the temperature of the solution. Core 201/4618 may suffer from uniform corrosion in mineral acids and hot strong alkaline solutions.


In aqueous solutions containing halogenides, e.g. chlorides or bromides, pitting and crevice corrosion may occur depending on halogenide concentration, temperature, pH-value, concentration of oxidizing compounds, or crevice geometry, if applicable. The resistance against pitting and crevice corrosion of Core 201/4618 is, however, slightly lower than of the basic austenitic CrNi standard grades. For a short period of time, for instance during cooking of food in stainless steel dishes, Core 201/4618 can even tolerate relatively high chloride concentrations. The presence of corrosion inhibiting or accelerating compounds like transition metal ions or organic compounds may influence the corrosion behaviour of Core 201/4618.


Core 201/4618 is prone to chloride-induced stress corrosion cracking at temperatures over about 50 °C depending on the applied stress and the chloride concentration in the environment. Prior cold deformation of the structure under load increases the risk of stress corrosion cracking.


Core 201/4618 can be used for indoor and outdoor applications in rural areas and urban environments where chloride contamination is low. The best material performance is reached usually with the help of adequate design, correct post-weld treatment, and regular cleaning during use (if applicable).

Pitting corrosion resistanceCrevice corrosion resistance
PRECPTCCT
17<10<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 more information on corrosion resistance, please refer to the Outokumpu Corrosion Handbook or contact the our corrosion experts.

Physical properties

 

 

DensityModulus of elasticityThermal exp. at 100 °CThermal conductivityThermal capacityElectrical resistanceMagnetizable
kg/dm3GPa10-6/°CW/m°CJ/kg°CµΩm
7,920016,0155000,73No
Fabrication

 

More detailed information concerning welding procedures can be obtained from the Outokumpu Welding Handbook, available from our sales offices.

Standards & approvals

 

 

StandardDesignation
EN 10088-21.4618