• Optimized chemical composition (29Cr-42Ni-Mo-N) for corrosive environment such as black liquor recovery boiler and waste to energy boiler.
• Excellent general corrosion resistance for both chloride and sulfate alkaline due to high Cr and Ni content.
• Excellent localized corrosion resistance for such as inter-granular corrosion and stress corrosion cracking due to optimized Ni, Mo, N and extra low C content.
• Applicable as mono-wall tube and outer component of composite tube.
• Enough formability, weldability for boiler tube application due to good phase stability.

• UNS No. N06811
• ASTM B407-04
• ASME SB407, Code Case 2518-1

Mechanical Properties

Tensile property requirement at room temperature

Physical properties

Coefficient of thermal expansion  [x10^-6 /deg. C]

Thermal conductivity  [W/mdeg. C]

Modules of elasticity  [GPa]

Properties at elevated temperature

Creep rupture properties

Fig.  Creep rupture test results of base metal.

Corrosion resistance

Synthetic ashes used in high temperature corrosion tests

                 Fig.  Corrosion test resuslts (ash A at 400 deg.C)   Fig.  Corrosion test results (9.1%Cl ash at 500 deg.C)

      Fig.  Corrosion test resuslts (9.1%Cl ash  at 550 deg.C)            Fig.  Corrosion test results (at 400 deg.C)

                      Fig.  Corrosion test resuslts (at 450 deg.C)          Fig.  Corrosion test results (at 500 deg.C)

                      Fig.  Corrosion test resuslts (at 550 deg.C)     Fig.  Effect of corrosion temperature (9.1%Cl ash)

Fig.  High temperature SCC test results of major austenitic steels and alloys reacted with ash B at 400 deg.C for 20 h in 1500 ppm HCl-300 ppm SO₂-7.5%CO₂-20%H₂O-bal. N₂ under constant stress of 34 kgf/mm².

Weldability

Fig.  Creep rupture test results of welded joints.