UNS N06690 Inconel Alloy 690 ASTM B166 Round Bar
Product Details
| Grade: | UNS N06690 / W.Nr. 2.4642 | Standard: | ASTM B166 / ASME SB166 AMS 5887 |
|---|---|---|---|
| Dia (mm): | 5 – 500 | Length (mm): | 1000 – 6000 (Standard) Customizable Up To 12,000 |
| Surface: | Hot Rolled / Forged / Cold Drawn Peeled / Turned / Ground / Polished Pickled / Sandblasting |
Product Description
- High-chromium nickel alloy Inconel 690 (UNS N06690, EN standard 2.4642) with 27–31% chromium content
- Outstanding resistance to high-temperature oxidation, sulfidation and oxidizing acid media
- Superior anti-stress corrosion cracking (SCC) performance in high-temperature pure water & caustic alkali
- Excellent stability in nitric acid, mixed nitric-hydrofluoric acid and nuclear reprocessing environments
- Good ductility, reliable weldability without sensitization risk under thermal cycling
- Retain stable mechanical performance from cryogenic to 1093°C high temperature
- Custom hot forging, hot rolling and full CNC precision machining per customer CAD drawings
- Manufactured strictly complying with ASTM B166, ASTM B167 international alloy standards
- Long service life for nuclear, chemical and high-temperature furnace equipment
This series of Inconel 690 round bars are hot forged & hot rolled solid high-chromium nickel alloy rods. After complete solution annealing and stress relief heat treatment, the material forms uniform single-phase austenite grain structure with stable dimensional tolerance and exceptional high-temperature & anti-corrosion performance.
Inconel 690 is a high-Cr nickel alloy specially developed for nuclear power and strong oxidizing acid service. Its ultra-high chromium content forms dense self-repairing Cr₂O₃ protective film, far surpassing Inconel 600 in anti-SCC and high-temperature oxidation resistance. It is the standard designated material for nuclear steam generator components, and widely applied in nitric acid chemical production, waste incineration and high-temperature sulfur-containing furnace equipment.
- High chromium nickel base alloy with 27.0–31.0% Cr, minimum 58% nickel base matrix
- Excellent resistance to stress corrosion cracking in high-temperature pure water & concentrated caustic soda
- Top-tier anti-oxidation and anti-sulfidation capacity under high-temperature oxidizing atmosphere
- Stable service in nitric acid, mixed nitric-hydrofluoric acid and radioactive waste treatment media
- No carbide precipitation after long-time heating, excellent intergranular corrosion resistance
- Good hot & cold machinability, stable mechanical property at ultra-low to ultra-high temperature
| Grade | EN Standard No. | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni Min | Fe | Cu ≤ |
|---|---|---|---|---|---|---|---|---|---|---|
| Inconel 690 | 2.4642 | 0.05 | 0.50 | 0.50 | 0.03 | 0.015 | 27.0–31.0 | 58.0 | 7.0–11.0 | 0.50 |
| Property | Inconel 690 Solution Annealed |
|---|---|
| Delivery Condition | Solution Annealed, Stress‑Relieved, Pickled |
| Minimum Tensile Strength | ≥550 MPa (80 ksi) |
| Minimum 0.2% Yield Strength | ≥241 MPa (35 ksi) |
| Minimum Elongation (50mm gauge) | ≥30 % |
| Maximum Brinell Hardness | ≤210 HB |
- Inconel Series: 600, 601, 617, 625, 690, 718, X-750, HX
- Incoloy Series: 800, 800H, 800HT, 825, 925, G-3
- Hastelloy Series: C4, C22, C276, C2000, B2, B3, G35
- Monel & Pure Nickel: Monel 400 / K-500, Nickel 200 / 201
- Duplex / Austenitic Stainless Steel: 2205, 2507, 304, 316L, 904L
- PH Stainless Steel: 17-4PH, 15-5PH, 17-7PH
- Alloy & Carbon Steel: 4140, 4340, F22, F91, A105, A516 Gr.70
High chromium content forms dense anti-oxidation film, stable continuous service up to 1093°C, ideal for sulfur-containing high-temperature furnace equipment.
Eliminate stress corrosion cracking risk in nuclear primary circuit pure water and concentrated caustic medium, core material for nuclear steam generators.
Stable long-term operation in nitric acid and mixed HF-HNO3 solution, superior to ordinary nickel alloys and stainless steel for pickling & acid reactors.
Low carbon formula avoids carbide precipitation, no intergranular corrosion after repeated heating & welding cycles.
Maintain reliable toughness and strength from cryogenic -196°C to ultra-high temperature working conditions.
- Nuclear power PWR steam generator tubes, tubesheets, baffles and internal fasteners
- Nuclear fuel reprocessing equipment, radioactive waste vitrification furnace parts
- Nitric acid production reactor, tail gas reheater and acid heat exchanger
- Stainless steel pickling line mixed acid heating coils & tank components
- Coal gasification, sulfuric acid furnace and waste incineration equipment liners
- High-temperature petrochemical heating furnaces, burner and recuperator parts
- Caustic soda evaporation equipment and high-temperature alkali pipeline fittings
We provide integrated hot rolling, hot forging and full precision machining services, and can produce finished components strictly according to customer CAD/PDF drawings:
- Custom fixed-length cutting, surface peeling, grinding and mirror polishing
- CNC Turning, Milling, Planing, Drilling, Boring, Threading
- Solution annealing & stress relief heat treatment customization
- Gear cutting, special irregular profile forming & passivation treatment
We supply alloy shafts, hollow bars, piston blanks, flanges, rings, fasteners and valve parts for nuclear & chemical industrial clients worldwide.
- UT Ultrasonic Testing to detect internal rolling & forging crack defects
- Tensile & hardness tester for full mechanical property verification
- High-precision dimensional measuring instrument for tight tolerance inspection
- Spectrometer full spectrum chemical composition analysis per production batch
- Metallographic microscope grain & precipitate microstructure inspection
Mill Test Certificate EN 10204 3.1 can be provided together with shipment documents before delivery.
- Inner packaging: waterproof anti-rust polybag for moisture, dust and scratch protection
- Outer packaging: reinforced fumigated wooden case / wooden pallet for long-distance sea transportation
- Custom special packaging solutions available upon customer request
Normally 10 – 45 days after receipt of advance payment. Exact delivery time depends on order quantity, bar diameter, length and customized machining & heat treatment requirements.
Product Highlights
Product Highlights High-chromium nickel alloy Inconel 690 (UNS N06690, EN standard 2.4642) with 27–31% chromium content Outstanding resistance to high-temperature oxidation, sulfidation and oxidizing acid media Superior anti-stress corrosion cracking (SCC) performance in high-temperature pure water ...
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