Inconel & Incoloy Round Bars
Inconel and Incoloy are families of nickel-chromium and nickel-iron-chromium alloys engineered for severe service. They combine oxidation and carburisation resistance at high temperature with resistance to chloride stress corrosion cracking and to a wide range of acids. Precipitation hardenable grades such as Inconel 718, X-750 and Incoloy 925 add very high strength for rotating and pressure retaining components.
Nexforge Alloys manufactures and stocks round bars in Inconel 600, 601, 625, 718, X-750 and in Incoloy 800, 800H, 800HT, 825, 925 and 330. Bars are supplied in the annealed, solution annealed or precipitation hardened condition as required by the governing ASTM / ASME / AMS specification, with full chemical and mechanical certification.
Inconel 600 / 601 / 625 / 718 / X-750 and Incoloy 800 / 800H / 800HT / 825 / 925 / 330 round bars, 6 mm to 300 mm diameter, in hot rolled, forged, peeled and bright finishes.
Inconel Round Bar Specification
| Parameter | Details |
|---|---|
| Grades | Inconel 600, 601, 625, 718, X-750; Incoloy 800, 800H, 800HT, 825, 925, 330 |
| Standards | ASTM B166, B446, B637, B408, B425, B805, B511; ASME SB166 / SB446 / SB637 / SB408 / SB425; AMS 5665, 5666, 5662, 5663, 5667 |
| Size Range | 6 mm to 300 mm diameter (larger forged bars on request) |
| Length | Random 3 to 6 metres, or cut to length |
| Condition | Annealed, solution annealed, or solution treated + precipitation hardened |
| Surface Finish | Hot rolled pickled, rough turned, peeled, centreless ground, bright |
| Tolerance | h9 / h10 / h11, or as per ASTM B880 / drawing |
| Testing | Chemical, tensile, hardness, grain size, IGC (ASTM G28), UT (on request) |
| Certification | EN 10204 3.1 mill test certificate; NACE MR0175 / ISO 15156 compliance where applicable |
Chemical Composition (% by weight)
| Grade (UNS) | Ni | Cr | Fe | Mo | Nb + Ta | Ti | Al | Cu | C | Others |
|---|---|---|---|---|---|---|---|---|---|---|
| Inconel 600 (N06600) | 72.0 min | 14.0 - 17.0 | 6.0 - 10.0 | - | - | - | - | 0.50 max | 0.15 max | Mn 1.0, Si 0.5, S 0.015 max |
| Inconel 601 (N06601) | 58.0 - 63.0 | 21.0 - 25.0 | Balance | - | - | - | 1.0 - 1.7 | 1.0 max | 0.10 max | Mn 1.0, Si 0.5 max |
| Inconel 625 (N06625) | 58.0 min | 20.0 - 23.0 | 5.0 max | 8.0 - 10.0 | 3.15 - 4.15 | 0.40 max | 0.40 max | - | 0.10 max | Co 1.0, Mn 0.5, Si 0.5 max |
| Inconel 718 (N07718) | 50.0 - 55.0 | 17.0 - 21.0 | Balance | 2.80 - 3.30 | 4.75 - 5.50 | 0.65 - 1.15 | 0.20 - 0.80 | 0.30 max | 0.08 max | Co 1.0, B 0.006 max |
| Inconel X-750 (N07750) | 70.0 min | 14.0 - 17.0 | 5.0 - 9.0 | - | 0.70 - 1.20 | 2.25 - 2.75 | 0.40 - 1.00 | 0.50 max | 0.08 max | Co 1.0, Mn 1.0 max |
| Incoloy 800 (N08800) | 30.0 - 35.0 | 19.0 - 23.0 | 39.5 min | - | - | 0.15 - 0.60 | 0.15 - 0.60 | 0.75 max | 0.10 max | Mn 1.5, Si 1.0 max |
| Incoloy 800H (N08810) | 30.0 - 35.0 | 19.0 - 23.0 | 39.5 min | - | - | 0.15 - 0.60 | 0.15 - 0.60 | 0.75 max | 0.05 - 0.10 | Al + Ti 0.30 - 1.20 |
| Incoloy 800HT (N08811) | 30.0 - 35.0 | 19.0 - 23.0 | 39.5 min | - | - | 0.25 - 0.60 | 0.25 - 0.60 | 0.75 max | 0.06 - 0.10 | Al + Ti 0.85 - 1.20 |
| Incoloy 825 (N08825) | 38.0 - 46.0 | 19.5 - 23.5 | 22.0 min | 2.50 - 3.50 | - | 0.60 - 1.20 | 0.20 max | 1.50 - 3.00 | 0.05 max | Mn 1.0, Si 0.5 max |
| Incoloy 925 (N09925) | 42.0 - 46.0 | 19.5 - 23.5 | 22.0 min | 2.50 - 3.50 | 0.50 max | 1.90 - 2.40 | 0.10 - 0.50 | 1.50 - 3.00 | 0.03 max | Mn 1.0, Si 0.5 max |
| Incoloy 330 (N08330) | 34.0 - 37.0 | 17.0 - 20.0 | Balance | - | - | - | - | 1.0 max | 0.08 max | Si 0.75 - 1.50, Mn 2.0 max |
Mechanical Properties
| Grade | Condition | Tensile Strength (min) | 0.2% Yield Strength (min) | Elongation (min) | Density |
|---|---|---|---|---|---|
| Inconel 600 | Annealed | 550 MPa (80 ksi) | 240 MPa (35 ksi) | 30 % | 8.47 g/cm³ |
| Inconel 601 | Annealed | 550 MPa (80 ksi) | 205 MPa (30 ksi) | 30 % | 8.11 g/cm³ |
| Inconel 625 | Annealed (Grade 1) | 827 MPa (120 ksi) | 414 MPa (60 ksi) | 30 % | 8.44 g/cm³ |
| Inconel 718 | Solution treated + aged | 1275 MPa (185 ksi) | 1035 MPa (150 ksi) | 12 % | 8.19 g/cm³ |
| Inconel X-750 | Solution treated + aged | 1137 MPa (165 ksi) | 724 MPa (105 ksi) | 20 % | 8.28 g/cm³ |
| Incoloy 800 | Annealed | 520 MPa (75 ksi) | 205 MPa (30 ksi) | 30 % | 7.94 g/cm³ |
| Incoloy 800H / 800HT | Solution annealed | 450 MPa (65 ksi) | 170 MPa (25 ksi) | 30 % | 7.94 g/cm³ |
| Incoloy 825 | Annealed | 586 MPa (85 ksi) | 241 MPa (35 ksi) | 30 % | 8.14 g/cm³ |
| Incoloy 925 | Solution treated + aged | 965 MPa (140 ksi) | 758 MPa (110 ksi) | 18 % | 8.08 g/cm³ |
| Incoloy 330 | Annealed | 483 MPa (70 ksi) | 207 MPa (30 ksi) | 30 % | 8.00 g/cm³ |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- Outstanding resistance to oxidation, carburisation and thermal cycling up to 1100 °C (Inconel 601)
- Inconel 625 and Incoloy 825 resist pitting, crevice corrosion and stress corrosion cracking in chlorides and acids
- Inconel 718 and X-750 deliver very high strength for shafts, fasteners and springs
- Incoloy 800H / 800HT offer certified creep and rupture strength for pressure parts above 600 °C
Applications
- Oil and gas wellhead, downhole and sub-sea components (625, 718, 925)
- Gas turbine and aero engine shafts, discs and fasteners (718, X-750)
- Furnace fixtures, radiant tubes and heat treatment equipment (600, 601, 330)
- Chemical process shafts, pump and valve parts (625, 825)
- Nuclear steam generator and reactor internals (600, 800)
- Ethylene and reformer furnace hardware (800H, 800HT)