Products Features
Excellent Resistance to Seawater Corrosion
It exhibits extremely low corrosion rates in both flowing and stagnant seawater and is insensitive to marine biological fouling, making it an ideal material for seawater cooling systems, ship components, and desalination equipment.
Superior Resistance to Hydrofluoric Acid Corrosion
Monel 400 is one of the few alloys that can withstand corrosion by hydrofluoric acid. It is suitable for equipment involved in the production, storage, and transportation of hydrofluoric acid, such as alkylation units, valves, and piping systems.
Good Resistance to Corrosion by Reducing Acids and Alkaline Solutions
It shows good corrosion resistance in non-oxidizing acids (e.g., dilute sulfuric acid, dilute hydrochloric acid, phosphoric acid) and alkaline solutions (e.g., sodium hydroxide, potassium hydroxide), making it applicable to chemical reactors, evaporators, and storage tanks.
Good Workability and Weldability
It can be cold or hot formed using conventional processes, with a recommended hot working temperature range of 870-1040°C. It has good welding properties (compatible with GTAW, GMAW, SMAW, etc.) and does not require post-weld heat treatment, making it suitable for manufacturing complex chemical equipment.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
63.0 - 70.0% |
Matrix elements that provide excellent corrosion resistance to reducing acids and alkalis |
|
Cu |
28.0 - 34.0% |
Imparting unique corrosion resistance of alloys in media such as seawater and hydrofluoric acid |
|
Fe |
≤ 2.5% |
Strict control to prevent reduced corrosion resistance |
|
Mn |
≤ 2.0% |
Deoxidizer, improve hot working properties |
|
Si |
≤ 0.5% |
Deoxidizer |
|
C |
≤ 0.30% |
Control carbon content to balance strength and workability |
|
S |
≤ 0.024% |
Prevent hot brittleness |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
8.80 g/cm³ |
Room temperature (20°C) |
|
Melting Point |
1300 - 1350°C |
- |
|
Coefficient of Thermal Expansion (20-100°C) |
13.9 × 10⁻⁶ /K |
- |
|
Elastic modulus (Young's modulus) |
179 GPa |
Room temperature |
|
Thermal conductivity (20°C) |
21.8 W/(m·K) |
- |
|
Resistivity |
0.51 µΩ·m |
Room temperature |
|
Magnetism |
Magnetism |
It has weak magnetism in the annealed state |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 480 MPa |
ASTM B127 / B164 |
|
Yield Strength |
≥ 170 MPa |
ASTM B127 / B164 |
|
Elongation |
≥ 35% |
ASTM B127 / B164 |
|
Hardness |
≤ 85 HRB |
Annealed state |
High-temperature performance
Monel 400 exhibits good oxidation resistance below 400°C, forming a stable oxide film on its surface. Prolonged use at higher temperatures leads to strength degradation and accelerated oxidation; it is recommended for use below 500°C.
High-Temperature Mechanical Properties:
At 400°C, the tensile strength remains above approximately 400 MPa, but yield strength gradually decreases with increasing temperature.
Suitable Media:
1. Seawater, saltwater, brines
2. Hydrofluoric acid (all concentrations, ambient to moderate temperatures)
3. Dilute sulfuric acid, dilute hydrochloric acid, phosphoric acid (non-oxidizing conditions)
4. Alkaline solutions (sodium hydroxide, potassium hydroxide, milk of lime)
5. Organic acids (formic acid, acetic acid, lactic acid)
6. Chloride solutions, acidic chloride media
Note: Monel 400 is not resistant to oxidizing acids (such as nitric acid, concentrated sulfuric acid), wet chlorine gas, or media containing oxidizing ions, as these environments can cause rapid corrosion failure.
Monel 400 is specifically designed for corrosive environments such as seawater, hydrofluoric acid, and alkaline solutions, and is recommended for use in the following areas:
Application Fields
-
Marine Engineering: Seawater cooling pipes, heat exchangers, pumps, valves, ship propellers, and fasteners, offering excellent resistance to seawater corrosion.
-
Chemical and Petrochemical Industries: Equipment for production, storage, and transportation of hydrofluoric acid (alkylation units, valves, piping); components of membrane electrolytic cells in chlor-alkali industry; reactors and evaporators in chloride media.
-
Oil and Gas: Downhole tools, pipelines, and platform equipment for acidic oil and gas fields containing H₂S, CO₂, and Cl⁻; facilities in refineries handling hydrofluoric acid and chlorides.
-
Chlor-Alkali Industry: Cathode grids, gaskets, and seals for ion-exchange membrane electrolytic cells; sodium chloride and sodium hydroxide evaporators.
-
Acid Pickling and Electroplating Equipment: Sulfuric and hydrochloric acid pickling tanks; anodes, hangers, and heat exchangers in electroplating baths.
-
Pharmaceutical and Food Industries: Alkaline-resistant equipment, fermenters, and distillation columns (under non-oxidizing conditions).
-
Water Treatment and Environmental Protection: Desalination plants (multi-stage flash, reverse osmosis); wastewater treatment equipment for chlorine-containing water; flue gas scrubbing systems for waste incineration.
-
Aerospace: Fuel system components, hydraulic lines, and gaskets (resistant to high-temperature hydraulic fluids and fuels).
-
Salt Production and Salt Chemicals: Evaporators, crystallizers, and brine pumps, suitable for processes with high-chloride concentrations.
-
Heat Treatment Fixtures: Baskets and fixtures used below 400°C.
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Monel 400 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
|
Customization Capability |
Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting |
Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions |
Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length) |
Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films |
Special surface treatment, precision drawing |
Why Choose Us? - Reliable engineering technology. Dependable delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of Monel 400?
Q: What kind of heat treatment does Monel 400 require?
Q: What is the maximum service temperature?
Q: What is the difference between Monel 400 and Inconel 625?
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