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Inconel 601 (UNS N06601) Seamless Pipe, Plate, Sheet and Bar
Inconel 601 (UNS N06601) nickel-chromium-iron-aluminium alloy supplied to ASME SB-167 seamless pipe and tube, SB-168 plate, sheet and strip, and SB-166 bar and rod. Aluminium content of 1.0-1.7% delivers high-temperature oxidation resistance for furnace internals, heat-treatment fixtures, radiant tubes and kiln components.
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Inconel 601 is a nickel-chromium-iron-aluminium alloy built for sustained high-temperature service where oxidation and carburisation attack conventional stainless steels and lower nickel alloys. The aluminium content of 1.0 to 1.7% forms a protective alumina scale during heating, which is why 601 is the standard selection for furnace internals, radiant tubes, heat-treatment baskets, kiln parts and catalytic converter substrates rather than for pressure-retaining piping alone.
Specification Coverage
Three product specifications apply depending on the form you order, all within ASME BPVC Section II Part B:
| Product Form | ASME Specification | UNS Designation |
|---|---|---|
| Seamless pipe and tube | SB-167 | N06601 |
| Plate, sheet and strip | SB-168 | N06601 |
| Bar and rod | SB-166 | N06601 |
| Forging stock | SB-564 | confirmed at order enquiry |
| Forged flanges | SB-462 | confirmed at order enquiry |
Note that N06601 is not listed in ASME SB-366 Table 2, which is the wrought nickel-alloy fittings specification. If you need forged or butt-weld elbows, tees and reducers in 601, confirm availability with our technical department before ordering.
Grade Comparison
| Grade | UNS | Aluminium | Chromium | Typical Position |
|---|---|---|---|---|
| Inconel 600 | N06600 | — | 14.0–17.0 | General corrosion and heat resistance |
| Inconel 601 | N06601 | 1.0–1.7 | 21.0–25.0 | Oxidising furnace atmosphere up to ~1,100 °C |
| Inconel 602CA | N06625 | 0.20–0.80 | 17.0–21.0 | Creep strength, not oxidation alone |
| Inconel 690 | N06690 | — | 27.0–31.0 | Sulphur-bearing and aggressive process gas |
The key distinction between 600 and 601 is the aluminium addition. 600 relies on chromium for its oxide scale; 601 relies on an alumina-rich scale that performs markedly better in high-temperature oxidising and carburising atmospheres. In sulfurous or nitrogen-bearing atmospheres at elevated temperature, Inconel 690 (N06690) is usually the better choice.
Size Range and Delivery Condition
| Parameter | Specification Basis | Typical Supply Range |
|---|---|---|
| Pipe OD | ASME B36.19M | 1/8 in. to 4 in. (supplier confirmation above 4 in.) |
| Wall thickness | SB-167 product analysis | Schedule 5S to Schedule 80 |
| Plate thickness | SB-168 Table 1 | 3/16 in. and over hot-rolled; 0.018 in. to 0.250 in. cold-rolled sheet |
| Sheet thickness | SB-168 Table 1 | 0.018 in. to 0.250 in. (0.46 to 6.35 mm) |
| Strip thickness | SB-168 Table 1 | 0.005 in. to 0.250 in. (0.13 to 6.35 mm) |
| Bar and rod | SB-166 | Round, square, hexagonal and cold-worked wire |
| Condition | SB-167 / SB-168 | Hot-rolled annealed, cold-worked annealed or solution annealed |
Mechanical Properties
| Specification | Condition | Tensile Strength min. | Yield (0.2%) min. | Elongation min. |
|---|---|---|---|---|
| SB-168 plate, sheet, strip | Annealed | 80,000 psi (550 MPa) | 30,000 psi (205 MPa) | 30% |
| SB-167 pipe and tube | Cold-worked or hot-worked annealed, all sizes | 80,000 psi (550 MPa) | per SB-167 Table 2 | per SB-167 |
Chemical Composition
Composition per SB-167 Table 1 for Alloy N06601:
| Element | Composition Limit, % |
|---|---|
| Nickel | remainder |
| Iron | remainder |
| Chromium | 21.0–25.0 |
| Aluminium | 1.0–1.7 |
| Manganese | 1.5 max |
| Copper | 1.0 max |
| Carbon | 0.10 max |
Nickel and iron are both designated as the balance element for N06601 in SB-167 Table 1; the exact balance split is confirmed by the certificate of conformity at the time of order.
Applications
- Radiant tubes, furnace liners and heat-treatment fixtures in steel and aluminium heat treatment
- Kiln furniture, burner parts and heat shields in ceramic and glass manufacturing
- Catalytic converter and exhaust manifold components in automotive and industrial after-treatment
- Salt bath pots and molten salt handling equipment
- High-temperature ducting and expansion joint components
- Chemical processing equipment exposed to oxidising acid atmospheres
Inspection and Testing
- EN 10204 3.1 or3.2 certification, with 3.2 available on request
- Solution annealing with records, per the applicable product specification
- Intercrystalline corrosion testing where required by the purchase specification
- Hydrostatic test available on pipe and tube orders
- Positive material identification (PMI) on all products
- Flattening, flaring and eddy-current or ultrasonic testing to the ASTM or ASME standard cited on your order
- Dimensional inspection against ASME B36.19M for pipe and the cited product specification for sheet, plate and bar
Ordering Information
Please include the following in your enquiry so we can quote precisely:
- Product form — pipe, plate, sheet, strip, bar or rod
- Grade — Inconel 601 / UNS N06601, and whether SB-167, SB-168 or SB-166 is required
- Dimensions — outside diameter and wall thickness, or plate thickness and width
- Length or weight per item
- Delivery condition — annealed or cold worked
- Certification level — EN 10204 3.1 or 3.2
- Any third-party requirements, PED or IBR approvals, or NACE MR0175 / MR0103 compliance
Send your requirements to our enquiry team and we will respond with a full material specification and commercial quotation.
