NAS690 Precipitation Hardening Stainless Steel Bar

 

NAS690 Ni-based alloy is a nickel-based alloy with Ni-Cr as the main component. NAS690 contains about 30% anti-oxidant Cr, which is both corrosion-resistant and heat-resistant. It is widely used in zero Components, high-pressure steam generating equipment, devices. NAS690 Ni-based alloy shows good corrosion resistance in many media. The high concentration of chromium not only makes NAS 690 alloy highly oxidizing and corrosion-resistant. NAS 690 can also play a role of anti-corrosion in nitrogen-containing compounds and acidic substances containing hydrogen and fluorine. Especially in the 98.5% concentration of the acidic environment is not eroded, and even 150 ℃ high temperature is still intact.

 

NAS690 Ni-based alloy chemical composition:

 

C ≤ 0.05,

Mn ≤ 0.5,

Ni ≥ 58.0,

Si ≤ 0.5,

S ≤ 0.015,

Cr 27.0-31.0,

Cu ≤ 0.5,

Iron (Fe) 7.0 ~ 11.0

 

NAS690 nickel-based alloy physical properties:

 

Density g / cm3: 8.2

Specific heat J / (kg * k): 450 (20 ° C)

Fixed resistance μΩ * cm: 115

Thermal conductivity w / m * k: 12.0

Average coefficient of thermal expansion 10-6 / ℃:

20 to 100 ° C 14.1

20 to 200 ° C 14.3

20 to 300 ° C 14.5

20 ~ 400 ℃ 14.8

Elastic coefficient N / mm-2: 21.5 * 10-4

Magnetic: None

Melting point ℃: 1345 ~ 1375

 

NAS690 nickel-based alloy mechanical properties: 

 

Tensile strength N / mm-2: 586

Yield strength N / mm-2: 240

Elongation%: 30

 

NAS690 nickel-based alloy Applications:

 

Compared to high-quality mechanical materials, the NAS 690 is resistant to both wet and high-temperature corrosion and makes it excellent in many applications.

NAS690 nickel-based alloy Typical application areas:

Radioactive waste treatment equipment;

Parts inside the steam generator for pressurized water reactors;

Parts of alkali-metal-curing furnaces;

Heavy oil burning furnace parts;

Production of glass and silicate products machine.