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Corrosion Resistance ASTM B444 N06625 Inconel Seamless U Bend Tube
What is Inconel 625?
Inconel 625 is a nickel chromium molybdenum solid solution strengthened high strength alloy, which retains strength to high temperatures. It is used from cryogenic temperatures to 980°C. Fatigue strength is outstanding, particularly as the bellows grade, Inconel 625LCF, where carbon, silicon and nitrogen are controlled to low levels.
The alloys have good oxidation resistance and resist corrosion by many corrosive media. When exposed to high temperatures for long periods, Inconel 625 will age harden due to the niobium, titanium and aluminium additions. When aged there is an increase in strength and some loss of ductility and toughness.
Corrosion Resistance of Inconel
Inconel 625 has corrosion resistance to many environments. In mild environments such as atmosphere, fresh water and sea water, neutral salts and alkaline media there is almost no attack. In more aggressive media nickel and chromium resist oxidising attack, while nickel and molybdenum resist reducing environments.
Molybdenum provides exceptional resistance to pitting and crevice corrosion, and niobium stabilises against sensitisation and intergranular corrosion. The nickel content makes Inconel 625 essentially free from chloride ion stress corrosion cracking. Inconel 625 also has excellent corrosion fatigue properties.
UNS N06625 products are furnished in two grades of different heat-treated conditions:
1.1.1.1 Grade 1 (annealed)—Material is normally employed in service temperatures up to 1100°F (593°C).
1.1.1.2 Grade 2 (solution annealed)—Material is normally employed in service temperatures above 1100°F (593°C) when resistance to creep and rupture is required.
Chemical Composition of N06625:
| (Ni) Nickel | 58.0 min |
| (Cr) Chromium | 20.0 to 23.0 |
| (Fe) Iron | 5.0 max |
| (Mo) Molybdenum | 8.0 to 10.0 |
| (Nb+Ta) Niobium+Tantalum | 3.15 to 4.15 |
| (Co) Cobalt* | 1.0 max |
| (Mn) Manganese | 0.50 max |
| (Si) Silicon | 0.50 max |
| (C) Carbon | 0.40 max |
| (Ti) Titanium | 0.40 max |
| (Al) Aluminum | 0.10 max |
| (P) Phosphorus | 0.015 max |
| (S) Sulfur | 0.015 max |
N06625 Material Equivalent
| Grade | UNS No | Old British | Euronorm | GOST | Japanese JIS | ||
| BS | En | No | AFNOR | ||||
| Alloy 625 | N06625 | NA 21 | NiCr22Mo9Nb | 2.4856 | NC22DNB4M | ХН75МБТЮ | NCF 625 |
Inconel 625 Mechanical and Physical Properties:
| PROPERTY | 21°C | 204 °C | 316 °C | 427 °C | 538 °C | 649 °C | 760 °C | 871 °C |
| Ultimate Tensile Strength /Mpa | 992.9 | 923.9 | 910.1 | 910.1 | 896.3 | 820.5 | 537.8 | 275.8 |
| 0.2% Yield Strength /MPa | 579.2 | 455.1 | 434.4 | 420.6 | 420.6 | 413.7 | 406.8 | 268.9 |
| Elongation % | 44 | 45 | 42.5 | 45 | 48 | 34 | 59 | 117 |
| Coefficient of Thermal Expansion µm/m⁰C | - | 13.1 | 13.3 | 13.7 | 14 | 14.8 | 15.3 | 15.8 |
| Thermal Conductivity /kcal/(hr.m.°C) | 8.5 | 10.7 | 12.2 | 13.5 | 15 | 16.4 | 17.9 | 19.6 |
| Modulus of Elasticity/ MPa | 2.07 | 1.93 | 1.93 | 1.86 | 1.79 | 1.65 | 1.59 | - |
Applications:
-Heat shields
-Tubing
-Combustion and chimney liners
-Valves
-Piping
-Distillation columns
-Bubble caps
-Reaction vessels
-Heat exchangers
-Furnace hardware
-Gas turbine engine duct work
-Equipment used to produce acid
-Sour gas production tubes
