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NAS 625G@High Nickel Corrosion and Heat Resistant Alloy

Characteristics of NAS 625

A solution strengthened nickel alloy with molybdenum and niobium added to the nickel-chromium base, NAS 625, comparable to alloy 625, provides superior corrosion and heat resistance. Uses include parts in chemical and garbage incinerator plants.

Chemical composition

(%)

- C Si Mn P S Ni Cr Mo Al Ti Fe Co Nb Ta
ASTM B443
UNS N06625
…0.10 …0.50 …0.50 …0.015 …0.015 †58.00 20.0`
23.0
8.0`
10.0
…0.40 …0.40 …5.0 …1.0 3.15`4.15
JIS G4902
NCF625
…0.10 …0.50 …0.50 …0.015 …0.015 †58.00 20.00`
23.00
8.00`
10.00
…0.40 …0.40 …5.00 - 3.15`4.15
NAS 625 0.02 0.10 0.08 0.010 0.001 61.73 21.60 9.00 0.22 0.24 3.32 0.02 3.65

Corresponding standard

ASTM B443 / UNS N06625

ASME SB443 / UNS N06625

JIS G4902 / NCF625

Mechanical properties


- 0.2% Proof stress
(MPa)
Tensile strength
(MPa)
Elongation
i“j
Hardness
iHVj
ASTM B443
UNS N06625 (solution annealed)
†276 †690 †30 -
JIS G4902
NCF 625 (Solution annealed)
†275 †690 †30 -
NAS 625
As cold rolled
392 832 57 197

Corrosion resistance

Test condition: 24 hrs in 7%H2SO4+3%HCl+1%FeCl3+1%CuCl2

Crevice corrosion resistance NAS625

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