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Premium Inconel 690 (UNS N06690) bar, tube, plate supplier. High-temperature nickel alloy for aerospace, chemical processing. ASTM/ASME compliant. Get quote.
Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer and global supplier of Inconel 690 (UNS N06690), supplying high-purity round bars, seamless tubes, and plates for nuclear power, chemical processing, and high-temperature industrial applications.
Quick Answer: What Is Inconel 690?
Inconel 690 (UNS N06690, W.Nr. 2.4642) is a high-chromium nickel alloy containing approximately 58% nickel and 27–31% chromium. The elevated chromium content gives it outstanding resistance to oxidizing acids, high-temperature corrosion, and — critically — primary water stress-corrosion cracking (PWSCC) in nuclear reactor environments, where it has largely replaced Inconel 600 as the material of choice for steam generator tubing in pressurized water reactors (PWRs).
Key standards: ASTM B166 (bar), ASTM B167 (tube), ASTM B168 (plate), ASME SB-163 (steam generator tubes)
Overview
Inconel 690 (UNS N06690) is a high-chromium nickel alloy containing a minimum of 58% nickel, 27–31% chromium and 7–11% iron. The elevated chromium level provides exceptional resistance to oxidizing acids, high-temperature oxidation and — most importantly — primary water stress-corrosion cracking (PWSCC) in pressurized water reactor environments, where the alloy has largely replaced Inconel 600 for nuclear steam generator tubing. Inconel 690 also exhibits excellent resistance to chloride-induced pitting and stress-corrosion cracking, and it maintains good mechanical properties and metallurgical stability at elevated temperatures. Hangbo supplies it as seamless tube (ASTM B163 / ASTM B167), plate (ASTM B168) and round bar (ASTM B166), with each heat fully documented to support nuclear-quality requirements.
Chemical Composition (ASTM B163/B167)
Chemical composition (wt%) of Inconel 690 (UNS N06690) per ASTM B163 and ASTM B167 (seamless tube):
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 58.0 min |
| Chromium (Cr) | 27.0 – 31.0 |
| Iron (Fe) | 7.0 – 11.0 |
Mechanical Properties (ASTM B163/B167)
Room-temperature mechanical properties (minimum values) of annealed Inconel 690 (UNS N06690):
| Property | Minimum Value |
|---|---|
| Tensile Strength | 550 MPa (80 ksi) |
| Yield Strength (0.2% offset) | 240 MPa (35 ksi) |
ASTM Product Forms & Standards (UNS N06690)
| Product Form | ASTM Standard |
|---|---|
| Seamless Tube (Steam Generator) | ASTM B163 |
| Seamless Tube | ASTM B167 |
| Plate, Sheet & Strip | ASTM B168 |
| Round Bar | ASTM B166 |
Why Engineers Choose Inconel 690
| Channel | Details |
|---|---|
| Website | www.nickel-alloy.com |
| sales@hangboalloy.com | |
| hangbo@nickel-alloy.com | |
| WhatsApp / Phone | +86 13611656360 |
| Skype | +86 13611656360 |
| Address | Shanghai, China |
Applications of Inconel 690
Inconel 690 (UNS N06690) is widely used in nuclear power plant steam generator tubes, pressurized water reactors, chemical processing equipment, high-temperature electrolytic cells. The alloy maintains excellent mechanical properties at temperatures up to 800F (427C) in nuclear applications, making it suitable for demanding high-temperature service environments.
Standards & Specifications: ASTM B166, ASME SB166, ASTM B163
