Inconel 690 (UNS N06690) raises chromium to 27–31% and is the replacement material for PWR nuclear steam generator tubing, offering far better intergranular corrosion and stress-corrosion-cracking resistance than Inconel 600 or the 800 series.
As a manufacturer and global exporter of special alloys since 2012, Shanghai Hangbo Alloy Group Co., Ltd. supplies Inconel 690 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), precision strip (0.02–3.0 mm, ±0.005 mm tolerance), welding wire & coils (1.0–5.0 mm), forgings & rolled rings (up to 7500 kg, 3500 mm OD) — all with EN 10204 3.1 certified material test reports.
Inconel 690 Chemical Composition (wt%)
| Element | Content (wt%) | Element | Content (wt%) |
|---|---|---|---|
| Ni (镍) | ≥ 58.0 | Mn (锰) | ≤ 0.50 |
| Cr (铬) | 27.0–31.0 | Si (硅) | ≤ 0.50 |
| Fe (铁) | 7.0–11.0 | Cu (铜) | ≤ 0.50 |
| C (碳) | ≤ 0.05 | S (硫) | ≤ 0.015 |
Inconel 690 Mechanical Properties
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 586 MPa |
| Yield strength (Rp0.2) | ≥ 240 MPa |
| Elongation (A) | ≥ 30 % |
| Hardness | ≤ 190 HB |
| Density | 8.19 g/cm³ |
| Melting range | 1343–1377 °C |
| Thermal conductivity | 11.1 W/m·K |
| Young's modulus | 211 GPa |
| Max service temperature | 1000 °C |
Key Advantages
- High chromium gives outstanding SCC resistance
- Better intergranular corrosion resistance than 600 and 800 series
- Long-term stability in chlorides and high-temperature water
- Good weldability with ERNiCrFe-7 class fillers
Relevant Standards
- ASTM B166
- ASTM B168
- ASTM B163
- ASTM B167
- UNS N06690
Typical Applications
- PWR steam generator tubing
- Nuclear evaporators and tube supports
- Nitric acid production equipment
- Waste incinerator superheater tubes
- High-temperature chloride-bearing chemical plant
Why Buy from Hangbo Alloy?
- Factory-direct manufacturer — founded 2012, headquartered in Shanghai Qingpu
- Full product range — bar, plate, sheet, strip, tube, forging, welding wire, flanges and machined parts
- Certified quality — ISO 9001:2015, GB/T 19001-2016, GJB 9001C-2017, EN 10204 3.1 mill test certificates with third-party inspection (SGS / BV / TUV) available on request
- Complete mill documentation — chemical analysis, mechanical test, ultrasonic test (UT), hardness and grain-size reports with every shipment
Contact Us — Shanghai Hangbo Alloy Group Co., Ltd.
Shanghai Hangbo Alloy Group Co., Ltd.
📍 No. 388 Songhuang Road, Qingpu District, Shanghai, China
📞 Tel / WhatsApp: +86 15618279078
✉️ Email: demi@nickel-alloy.com
🕒 Available 24 hours a day, 7 days a week — enquiries answered around the clock.
Send your drawing or enquiry (grade, form, size, quantity, standard) for a same-day quotation.
Frequently asked questions
Why did nuclear steam generator tubing move from Inconel 600 to 690?
600 suffered primary- and secondary-side stress-corrosion cracking in high-temperature, high-pressure borated water. 690 raises chromium to about 30%, sharply reducing grain-boundary chromium depletion and improving SCC resistance by more than an order of magnitude, which is why it became the standard for PWR SG tubing.
What forms and sizes are available?
We supply Inconel 690 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), precision strip (0.02–3.0 mm, ±0.005 mm tolerance), welding wire & coils (1.0–5.0 mm), forgings & rolled rings (up to 7500 kg, 3500 mm OD). Custom lengths, tolerances and machining to drawing are available on request.
What is the MOQ and lead time?
MOQ is flexible — trial orders from a single piece are welcome. Stock sizes ship in 3–7 days; custom forgings and machined parts typically 15–35 days depending on quantity and process.
Can you provide third-party inspection and shipping to my port?
Yes. SGS / BV / TUV or your nominated inspector can witness all tests before shipment. Full export documentation is provided, and we ship worldwide by sea or air on FOB, CIF or DDP terms.