Monel 400 (UNS N04400) is a solid-solution nickel-copper alloy (Ni ≥ 63%, Cu 28–34%) with excellent resistance to seawater, hydrofluoric acid, sulphuric acid and alkalis, plus higher strength than pure nickel. It is a classic material for marine engineering, pump shafts and valves.
As a manufacturer and global exporter of special alloys since 2012, Shanghai Hangbo Alloy Group Co., Ltd. supplies Monel 400 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), flanges & pipe fittings (Class 150–2500, DN15–DN1200) — all with EN 10204 3.1 certified material test reports.
Monel 400 Chemical Composition (wt%)
| Element | Content (wt%) | Element | Content (wt%) |
|---|---|---|---|
| Ni (镍) | ≥ 63.0 | C (碳) | ≤ 0.30 |
| Cu (铜) | 28.0–34.0 | Si (硅) | ≤ 0.50 |
| Fe (铁) | ≤ 2.5 | S (硫) | ≤ 0.024 |
| Mn (锰) | ≤ 2.00 |
Monel 400 Mechanical Properties
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 480 MPa |
| Yield strength (Rp0.2) | ≥ 195 MPa |
| Elongation (A) | ≥ 35 % |
| Hardness | ≤ 170 HB |
| Density | 8.80 g/cm³ |
| Melting range | 1300–1350 °C |
| Thermal conductivity | 21.8 W/m·K |
| Young's modulus | 179 GPa |
| Max service temperature | 600 °C |
Key Advantages
- Resists seawater, salt spray and high-velocity impingement
- Material of choice for anhydrous hydrofluoric acid
- Resists alkalis including molten caustic, and many organic acids
- Tough down to −100 °C
- Higher thermal conductivity than most nickel alloys
Relevant Standards
- ASTM B164
- ASTM B127
- ASTM B165
- ASTM B564
- UNS N04400
Typical Applications
- Marine and desalination piping, pump shafts and propellers
- HF acid production, storage and transfer equipment
- Crude distillation overhead condensing systems
- Valves, pump bodies and fasteners
- Musical instrument strings and architectural roofing
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
What is the difference between Monel 400 and Monel K-500?
K-500 adds 2.3–3.15% aluminium and 0.35–0.85% titanium to the 400 chemistry and is strengthened by γ′ ageing, giving two to three times the yield strength of 400 (around 690 MPa) and much higher hardness. However, K-500 is slightly less corrosion resistant than 400 in some acids and its aged condition needs care regarding stress-corrosion susceptibility.
How well does Monel 400 resist seawater?
Very well. In flowing seawater the corrosion rate is typically below 0.025 mm/a and it resists cavitation and impingement, which is why it has long been used for pump shafts, propeller shafts and heat exchangers. In stagnant seawater or where sulphide contamination exists, pitting can occur — avoid long stagnation and control sulphides.
What forms and sizes are available?
We supply Monel 400 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), flanges & pipe fittings (Class 150–2500, DN15–DN1200). 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.