Stainless steel · ASTM A790

Duplex 2205 (pipe)

Full datasheet

Overview

Duplex 2205 (pipe) is a stainless steel grade (ASTM A790) used where corrosion resistance and cleanability matter.

Typical supply: Sheet, plate, bar, tube, wire

Mechanical Properties

Young's modulus E200 GPa
Shear modulus G76.9 GPa
Yield / proof Re450 MPa
Ultimate Rm655 MPa
Poisson's ratio ν0.3
Shear strength393 MPa
Bearing strength900 MPa

Thermal Properties

Thermal expansion α13 µm/(m·K)

For temperature derating, open Temperature Properties.

Physical Properties

Density ρ8e+3 kg/m³
Specific strength Sy/ρ5.77e+4 Pa·m³/kg
Specific stiffness E/ρ2.56e+7 Pa·m³/kg

Typical supply: Sheet, plate, bar, tube, wire

Density typically ~7800–8000 kg/m³ depending on alloy family.

Applications

  • Corrosive service equipment
  • Food, pharma, and hygienic plant
  • Architectural and marine fittings
  • Pressure parts (code-dependent)

Advantages

  • Inherent corrosion resistance without thick coatings
  • Hygienic finish options for process plant
  • Good toughness over a wide temperature range (austenitic)

Limitations

  • Higher cost than carbon structural steel
  • Chloride stress-corrosion risk for some grades/environments
  • Lower thermal conductivity than carbon steel or aluminum

Standards

  • ASTM A790

Equivalent Materials

Compare with these grades →

Electrical Properties

Not published for this grade.

Chemical Composition

Not published for this grade.

Machinability

Machinability index: 30 (AISI 1212 ≈ 100)

Work-hardening austenitics need sharp tools, rigid setups, and adequate coolant.

Cost

Relative cost band: high

Premium vs carbon steel; Mo-bearing grades cost more than 304 family.

Corrosion

Class: excellent

Select grade by environment (chloride, acid, temperature); surface finish matters.

  • Indoor / atmosphericexcellent
  • Fresh watergood
  • Marine splashfair

For allowance / life screening, open Corrosion Allowance.