Alloy 59, 2.4605, UNS N06059, Haynes® 59 - nickel alloy

Alloy 59, 2.4605, UNS N06059, Haynes® 59, NiCr23Mo16Al - nickel alloy according to ASTM B 366 and other standards

Alloy 59, UNS N08031, 2.4605, NiCr23Mo16Al – description

Alloy 59 (UNS N08031) is a Ni-Cr-Mo corrosion-resistant alloy with very low concentrations of carbon and silica. It can be seen as an alteration of alloys C-2000, and C-4, developed specifically for severe conditions in flue gas desulphurization installations. It has better thermal stability in ASTM G28A tests than C-2000 and C-4 and it achieved NACE MR 0175/ISO 15156 Level VII resistance, which makes this alloy very interesting for the Oil&Gas industry. It is certified for the transport of hazardous goods.

Applications

Alloy 59 is used mainly in chemical processing and pollution control. Typical applications are scrubbers, heat exchangers, ventilators and agitators for flue gas desulfurization in fossil fuel power plants and waste combustion plants, SO₂-washers for ship diesel engines, reactors for acetic acid, acetic anhydrines, hydrofluoric acid, coolers for sulfuric acid and tubes in geothermal power plants.

Physical and Tensile Properties

Room temperature physical properties:

• Density: 8.6 g/cm³
• Melting Temperature: 1310-1360 °C
• Magnetic Permeability: 1.001

High-temperature Coefficient of Thermal Expansion, from 20°C to:

• 100°C: 11.9 μm/m⋅K
• 200°C: 12.2 μm/m⋅K
• 300°C: 12.5 μm/m⋅K
• 400°C: 12.7 μm/m⋅K
• 500°C: 12.9 μm/m⋅K
• 600°C: 13.1 μm/m⋅K

Thermal Conductivity:

• 20°C: 10.4 W/m · K
• 100°C: 12.1 W/m · K
• 200°C: 13.7 W/m · K
• 300°C: 15.4 W/m · K
• 400°C: 17.0 W/m · K
• 500°C: 18.6 W/m · K
• 600°C: 20.4 W/m · K

Electrical Resistivity:

• 20°C: 1.26 μΩ·m
• 100°C: 1.27 μΩ·m
• 200°C: 1.29 μΩ·m
• 300°C: 1.31 μΩ·m
• 400°C: 1.33 μΩ·m
• 500°C: 1.34 μΩ·m
• 600°C: 1.33 μΩ·m

Young's Modulus:

• 20°C: 210 GPa
• 100°C: 207 GPa
• 200°C: 200 GPa
• 300°C: 196 GPa
• 400°C: 190 GPa
• 500°C: 185 GPa
• 600°C: 178 GPa

Specific Heat Capacity:

• 20°C: 414 J/kg⋅K
• 100°C: 425 J/kg⋅K
• 200°C: 434 J/kg⋅K
• 300°C: 443 J/kg⋅K
• 400°C: 451 J/kg⋅K
• 500°C: 459 J/kg⋅K
• 600°C: 464 J/kg⋅K

High-Temperature Mechanical Properties of alloy 59 plates, annealed and quenched, according to VdTÜV material data sheet 509:

• 20°C:
  • Yield strength: >340 MPa
  • Tensile strength: 690-900 MPa
  • Elongation: >40%
• 100°C:
  • Yield strength: >290 MPa
  • Tensile strength: >650 MPa
  • Elongation: >40%
• 200°C:
  • Yield strength: >250 MPa
  • Tensile strength: >615 MPa
  • Elongation: >40%
• 300°C:
  • Yield strength: >220 MPa
  • Tensile strength: >580 MPa
  • Elongation: >40%
• 400°C:
  • Yield strength: >190 MPa
  • Tensile strength: >545 MPa
  • Elongation: >40%
• 450°C:
  • Yield strength: >175 MPa
  • Tensile strength: >525 MPa
  • Elongation: >40%

Impact Strength:

• 20°C: >200 J/cm2
• -196°C: >160 J/cm2

Corrosion Resistance

Extremely low carbon and silica content causes alloy 59 to have no propensity for grain boundary dispersions in hot working or welding. In effect alloy 59 resists highly aggressive oxidizing and reducing aqueous environments, as well as media containing chloride ions, with optimum resistance to localized corrosion. It's especially noteworthy, since many other nickel alloys are either highly resistant to oxidizing environments, or reducing ones, but not both at the same time.

Flue gas desulfurization environment - very good resistance.

Sour gas, crude oil environment - very good resistance to stress corrosion cracking, confirmed by achieved NACE MR 0175/ISO 15156 Level VII.

Marine applications - very good resistance to crevice corrosion for critical areas in marine applications.

Weldability

Suitable to all technical welding processes. Good thermal stability and low sensitivity to hot cracking. Weldments have the same corrosion resistance as the base metal. Alloy 59 is successfully used as a filler metal. Welding p-number 43 and brazing p-number 111 according to ASME Section IX and ISO/TR 20173. Weld in solution-annealed condition.

Selection of welding consumables:

• Filler metal - ERNiCrMo-13 / S Ni 6059 / NiCr23Mo16 (VDM® FM 59)

Heat Treatment, Working and Machining

Recommended heat treatment and hot work parameters:

• Hot working: 1180-950 °C; rapid air cool / water quench
• Solution-treatment: 1100-1180 °C; rapid air cool / water quench

For best corrosion resistance, the component should be rapidly cooled (> 150°C/min) from solutioning temperature down to 500°C.

Cold forming should be carried out on solution-treated workpieces. For cold forming of >15% a final solution annealing is required.

We deliver this steel alloy as:

• Sheets according to DIN 17750, DIN 17744, VdTÜV 505, ASME SB-575 / ASTM B575, NACE MR 0175/ISO 15156, API 6ACRA
• Strips according to DIN 17744, VdTÜV 505, ASME SB-575 / ASTM B575, NACE MR 0175/ISO 15156, API 5LD, API 6ACRA
• Bars according to DIN 17752, DIN 17744, VdTÜV 505, ASME SB-574 / ASTM B574, ASME SB-564 / ASTM B564, NACE MR 0175/ISO 15156, API 6ACRA
• Wires according to DIN 17744

Replacements, equivalents and other designations:

Alloy 59, DMV 59, ERNiCrMo-13, UNS N06059, VDM® alloy 59, Nicrofer® 5923 hMo, VDM® FM 59, 2.4607, S Ni 6059, NiCr23Mo16, SNi6059, Haynes® 59, ASTM B 366-19 (CR5923) / ASME SB-366-19 (CR5923), ASTM B 366-19 (WP5923) / ASME SB-366-19 (WP5923), ASTM B 462-18e1 (N06059) / ASME SB-462-18e1 (N06059), ASTM B 472-18 (N06059) / ASME SB-472-18 (N06059), ASTM B 564-19 (N06059) / ASME SB-564-19 (N06059), ASTM B 574-18 (N06059) / ASME SB-574-18 (N06059), ASTM B 575-17 (N06059) / ASME SB-575-17 (N06059), ASTM B 619-19 (N06059) / ASME SB-619-19 (N06059), ASTM B 622-17b (N06059) / ASME SB-622-17b (N06059), ASTM B 626-19 (N06059) / ASME SB-626-19 (N06059)