Alloy 617
Nickel-chromium-cobalt-molybdenum alloy for the extreme end of high temperature service. Solid solution strengthening keeps useful creep strength to 1100 C while the chromium and aluminium give oxidation resistance, so 617 is used where 800HT and stainless are long past their limit.
- Creep strength and oxidation resistance to 1100 C
- Solid solution strengthened — no ageing treatment needed
- Qualified for advanced ultra-supercritical steam plant
- Plate, seamless pipe, BA finish tube and bar from one source
Available forms & sizes
| Form | Size range |
|---|---|
| Seamless Pipes & Tubes | 1/2" - 16" NB, SCH 10S - SCH 160, seamless |
| Seamless Pipes & Tubes | 6 - 88.9 mm OD tube, BA / bright annealed finish |
| Plates | 3 - 50 mm thk, hot rolled and solution annealed |
| Round Bars | 10 - 300 mm dia |
| Fittings | 1/2" - 24" butt weld fittings and flanges |
Chemical composition (%)
| Element | Min | Max |
|---|---|---|
| Ni | 44.5 | - |
| Cr | 20.0 | 24.0 |
| Co | 10.0 | 15.0 |
| Mo | 8.0 | 10.0 |
| Al | 0.80 | 1.50 |
Mechanical properties
| Property | Value | Unit |
|---|---|---|
| Yield Strength (0.2%) | 240 min | MPa |
| Tensile Strength | 655 min | MPa |
| Elongation | 35 min | % |
| Condition | Solution annealed | - |
Physical properties
| Property | Value | Unit |
|---|---|---|
| Density | 8.36 | g/cm3 |
| Max Service Temperature | 1100 | C |
Typical applications
Frequently asked
[ 02 ] Other grades in Nickel Alloys
Inconel 625
Mill indentNickel-chromium-molybdenum alloy strengthened by niobium. Exceptional strength and corrosion resistance from cryogenic temperatures to 980 C without heat treatment.
Inconel 600
Mill indentSolid solution nickel-chromium-iron alloy with high resistance to oxidation, carburisation and chloride ion stress corrosion cracking at elevated temperature.
Monel 400
Mill indentNickel-copper alloy with outstanding resistance to flowing seawater, hydrofluoric acid and alkalis, and total immunity to chloride stress corrosion cracking.
Hastelloy C276
Mill indentNickel-molybdenum-chromium alloy with tungsten, regarded as the most universally corrosion resistant alloy available for both oxidising and reducing media.
Alloy 800 (Incoloy 800)
Mill indentIron-nickel-chromium alloy for high temperature strength with oxidation and carburisation resistance. The 32Ni-21Cr balance resists chloride stress corrosion cracking that austenitic stainless suffers, which is why it is standard for process heater and reformer tubing.
Alloy 800HT (Incoloy 800HT)
Mill indentThe creep-optimised version of Alloy 800. Controlled carbon plus a combined aluminium and titanium window of 0.85 - 1.20% gives far better creep rupture strength above 600 C, so 800HT is the grade for the hottest reformer and pigtail service rather than plain 800.