Alloy 400，Monel 400 Bar(Round bar, Flat bar)，UNS N04400，EFORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA11，American Specs:AMS 4574 Tube AMS 4575 (Tube *) AMS 4675 Bar and Forgings AMS 4730 Wire AMS 4731 Wire and Ribbon AMS 4544 Sheet, Strip and Plate QQ-N-281 ASTM B164，German Specs:

### **Alloy 400 / Monel 400 Bar (Round Bar, Flat Bar) - UNS N04400** **Overview** **Alloy 400**, commonly known as **Monel 400**, is a nickel-copper alloy renowned for its exceptional corrosion resistance, high strength, and excellent toughness across a wide temperature range. The **bar** product form, including **round bars** and **flat bars**, is a fundamental stock material for machining, fabrication, and structural components in highly corrosive environments. These products are designed to withstand aggressive media such as seawater, sulfuric and hydrofluoric acids, and alkaline solutions. The UNS (Unified Numbering System) designation for this alloy is **N04400**. Monel 400 bars are available in various conditions (hot-finished, cold-drawn, annealed) to meet specific mechanical property and machining requirements. --- ### **Chemical Composition** The chemical composition is precisely controlled to deliver the alloy's signature performance characteristics. | Element | Content (%) (Typical) | | :--- | :--- | | **Nickel (Ni)** | 63.0 (Minimum) | | **Copper (Cu)** | 28.0 - 34.0 | | **Iron (Fe)** | 2.5 (Maximum) | | **Manganese (Mn)** | 2.0 (Maximum) | | **Carbon (C)** | 0.3 (Maximum) | | **Silicon (Si)** | 0.5 (Maximum) | | **Sulfur (S)** | 0.024 (Maximum) | **Key Point:** The balanced nickel-copper composition provides excellent resistance to a wide range of corrosive media, including seawater, sulfuric acid, and alkaline solutions, while offering immunity to chloride-ion stress-corrosion cracking. --- ### **Physical Properties** Monel 400 bar exhibits a robust set of physical properties suitable for demanding applications. | Property | Value / Condition | | :--- | :--- | | **Density** | 8.80 g/cm³ (0.318 lb/in³) | | **Melting Point** | 1350 °C (2460 °F) | | **Electrical Resistivity** | ~51 μΩ·cm at 20°C | | **Thermal Conductivity** | ~22 W/m·K at 20°C | | **Thermal Expansion Coefficient** | 13.9 μm/m·°C (20-100°C) | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties (Typical for Bar)** The mechanical properties of Monel 400 bar vary depending on the product form and temper condition. | Temper & Form | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (in 2 inches / 50mm) | | :--- | :--- | :--- | :--- | | **Hot-Finished Round/Flat Bar** | 550 - 690 MPa (80 - 100 ksi) | 280 - 410 MPa (40 - 60 ksi) | 30 - 40% | | **Cold-Drawn Round Bar** | 620 - 860 MPa (90 - 125 ksi) | 480 - 760 MPa (70 - 110 ksi) | 15 - 30% | | **Annealed Bar** | 550 - 690 MPa (80 - 100 ksi) | 240 - 380 MPa (35 - 55 ksi) | 35 - 45% | --- ### **International Standards** Monel 400 bar is covered by numerous international standards, ensuring consistent quality and performance. | Standard Organization | Standard Number & Title | Product Form | | :--- | :--- | :--- | | **ASTM International** | **ASTM B164** - Standard Specification for Nickel-Copper Alloy Rod, Bar, and Wire | Rod, Bar (Round & Flat) | | **ASME (American Society of Mechanical Engineers)** | **SB-164** - Identical to ASTM B164 for ASME Code use | Pressure Vessel Components | | **SAE (Aerospace Materials Spec.)** | **AMS 4676** (Hot Finished/Hot Rolled Bar) | Bar | | **UNS** | **N04400** | All Forms | | **DIN (German Standard)** | **DIN 17743** / **NiCu30Fe** (Material No. 2.4360) | All Forms | | **EN (Euronorm)** | **EN 2.4360** (NiCu30Fe) | All Forms | --- ### **Product Applications** Monel 400 round and flat bars are versatile stock forms used across multiple industries for critical components. **Round Bar Applications:** * **Shafting:** Pump shafts, propeller shafts, and mixer shafts in marine and chemical processing equipment. * **Fastener Stock:** Raw material for manufacturing high-strength, corrosion-resistant bolts, studs, and nuts. * **Valve Components:** Machined into valve stems, trim, and plugs for seawater and chemical service valves. * **Machined Parts:** Bushings, bearings, gears, and spindles that require excellent corrosion resistance. **Flat Bar Applications:** * **Structural Fabrication:** Used for building supports, brackets, and frames in corrosive environments like marine platforms and chemical plants. * **Wear Strips & Guides:** In processing equipment where corrosion resistance and durability are needed. * **Flanges and Ring Components:** Fabricated into custom flanges, seals, and other ring-shaped parts. * **Heat Exchanger Baffles:** Machined from flat bar stock for use in shell-and-tube heat exchangers. --- ### **Key Advantages and Characteristics** * **Superior Corrosion Resistance:** Excellent resistance to seawater, sulfuric acid, hydrofluoric acid, and alkaline solutions. Resists chloride-ion stress-corrosion cracking. * **High Strength and Toughness:** Maintains good mechanical properties from sub-zero temperatures up to about 540°C (1000°F). * **Excellent Machinability:** Monel 400 has fair to good machinability, rated at approximately 20-30% compared to free-cutting brass. Cold-drawn bars offer improved machinability over hot-finished products. * **Good Weldability:** Can be readily welded using common techniques (GTAW/TIG, GMAW/MIG) with appropriate filler metals like Monel 60 (ERNiCu-7). * **Non-Magnetic Properties:** Essentially non-magnetic, making it suitable for sensitive electronic and marine applications. In summary, **Alloy 400 / Monel 400 Bar (Round & Flat), UNS N04400** provides exceptional corrosion resistance and mechanical strength in versatile stock forms. These products are essential raw materials for manufacturing durable components in marine engineering, chemical processing, oil & gas, and other demanding industries.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1665 gallon liquid totes Special package is available on request.