Monel Products
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Table of Contents
- Introduction to Monel Products
- Monel Grades Overview
- Standard Specifications
- Chemical Composition Comparison (%)
- Mechanical Properties (Typical)
- Key Applications by Industry
- Corrosion Resistance Properties
- Why Choose Stellar Alloys for Monel Products?
- Quality Assurance & Testing
- Stock Availability
- Frequently Asked Questions
Stellar Alloys is a prominent supplier of Monel products and an international manufacturer, committed to providing solutions of high quality nickel-copper alloy in extreme marine and chemical conditions. We also have a complete line of Monel products, including seamless and welded pipes, tubes, plates, sheets, flanges, fittings, and round bars in high grade Monel 400 (UNS N04400 material) and Monel K500 (UNS N05500material) products. Our materials are also renowned to have excellent resistance to seawater, hydrofluoric acid, steam, and caustic alkalis and are therefore important in marine engineering, oil and gas extraction, and chemical processing. Being a reliable manufacturer and distributor of Monel, we guarantee that all products are of high quality and comply with the requirements of the standards of ASTM B164, B165, and B127, with the assistance of strict quality testing, full certification, and global logistics to assist with your most problematic projects.
Available Grades of Monel
Monel Pipes & Tubes
Seamless and welded pipes in grades 400 and K500 for corrosive environments.
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Monel Plates & Sheets
High-strength plates and sheets resistant to marine corrosion
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Monel Flanges & Fittings
Complete range of Monel flanges and pipe fittings.
View Fittings →
Introduction to Monel Products
Monel is a family of nickel copper alloys, which consist largely of nickel (upto 67% and copper), with small amounts of iron, manganese, carbon, and silicon. The Monel alloys, initially produced by the International Nickel Company (now Special Metals Corporation), have a greater strength than pure nickel, and are renowned due to their great resistance to seawater, hydrofluoric acid, sulfuric acid and alkalies corrosion.
In comparison to stainless steel, Monel is a better resister in reducing environments and is in effect resistant to chloride-ion stress corrosion cracking. It has a high strength and toughness at a broad temperature range, subzero cryogenic temperatures to 1000°F (538°C).
Stellar Alloys is one of the leading suppliers of Monel products, which means that the industry will not lack these essential materials. You may require the general-purpose corrosion resistance of Monel 400 or the strength of Monel K500 that is precipitation hardened and we offer certified materials that are ready to be fabricated into shafts, valves, pumps and process piping.
Monel Pipes & Tubes
We offer high-quality Monel pipes and tubes designed for heat exchangers, evaporators, and marine piping systems.
| Specification | Details |
|
Size Range |
Seamless: 15 NB to 600 NB Tubes: 1mm to 254mm OD |
|
Schedules |
SCH 5S, 10S, 40S, 80S, 160, XXS |
|
Standards |
ASTM B165, B725, B730, ASME SB165 |
|
Types |
Seamless, Welded, ERW |
|
Key Grades |
Monel 400, Monel K500 |
Monel Plates & Sheets
Our inventory includes Monel plates and sheets suitable for vessel construction, marine sheathing, and chemical tank fabrication.
| Specification | Details |
|
Thickness |
0.5mm to 100mm |
|
Width |
1000mm, 1219mm, 1500mm, 2000mm |
|
Length |
2000mm, 2440mm, 3000mm, 6000mm |
|
Finish |
Hot Rolled, Cold Rolled, 2B, No.1 |
|
Standards |
ASTM B127, ASME SB127 |
|
Key Grades |
Monel 400, Monel K500 |
Monel Flanges & Fittings
Robust flanges and fittings manufactured to ensure leak-free connections in high-corrosion environments.
| Specification | Details |
|
Types |
Weld Neck, Slip-On, Blind, Socket Weld, Threaded |
|
Standards |
ASME B16.5, B16.47, B16.9 |
|
Pressure Class |
150#, 300#, 600#, 900#, 1500# |
|
Fittings |
Elbows, Tees, Reducers, Caps, Stub Ends |
Monel Grades Overview
Grade | UNS No. | Key Features | Corrosion Resistance | Primary Applications |
Monel 400 | N04400 | Solid-solution alloy, high strength, tough over wide temp range. | Excellent in seawater, HF acid, steam, and salt. | Marine engineering, chemical and hydrocarbon processing. |
N05500 | Precipitation-hardenable with added Al and Ti. | Same as 400 but with higher tensile strength (2x-3x). | Pump shafts, oil-well tools, springs, doctor blades. | |
Monel R-405 | N04405 | Free-machining grade with added Sulfur. | Similar to 400, specialized for automatic screw machining. | Fasteners, screw machine products, valve parts. |
Standard Specifications
Product Form | ASTM Standards |
Pipes (Seamless) | ASTM B165, ASME SB165 |
Pipes (Welded) | ASTM B725, B730 |
Plates & Sheets | ASTM B127, ASME SB127 |
Flanges | ASME B16.5, B16.47 |
Fittings | ASTM B366, ASME B16.9 |
Bars & Rods | ASTM B164, ASME SB164 |
Chemical Composition Comparison (%)
Grade | Ni (+Co) | Cu | Fe | Mn | C | Al | Ti |
Monel 400 | 63.0 min | 28.0-34.0 | 2.5 max | 2.0 max | 0.3 max | – | – |
Monel K500 | 63.0 min | 27.0-33.0 | 2.0 max | 1.5 max | 0.25 max | 2.30-3.15 | 0.35-0.85 |
Mechanical Properties (Typical)
Grade | Condition | Tensile Strength | Yield Strength (0.2%) | Elongation | Hardness |
Monel 400 | Annealed | 517-620 MPa (75-90 ksi) | 172-345 MPa (25-50 ksi) | 35-60% | 110-149 HB |
Monel K500 | Aged | 965-1200 MPa (140-175 ksi) | 690-860 MPa (100-125 ksi) | 20-30% | 27-33 HRC |
Key Applications by Industry
- Marine Engineering : Seawater pumps, propeller shafts, valve stems, and boat hulls utilize Monel for its virtual immunity to pitting and stress corrosion cracking in flowing seawater.
- Chemical Processing : Handling hydrofluoric acid, fluorine, hydrogen chloride, and sulfuric acid. Monel 400 is one of the few alloys that can withstand hydrofluoric acid in all concentrations.
- Oil & Gas : Used in crude oil distillation towers, heat exchangers, valves, and pumps exposed to sour gas and brine. Monel K500 is used for drill collars and instruments.
- Power Generation : Feedwater heaters, de-aerating heaters, and heat exchangers benefit from Monel’s high strength and corrosion resistance at elevated temperatures.
- Aerospace : Aircraft fuel tanks, hydraulic tubing, and rivets. Monel is used for its safety in oxygen systems and retention of strength at cryogenic temperatures.
- Medical : Surgical instruments and implants utilize Monel due to its resistance to sterilization chemicals and body fluids, though less common than Titanium or Stainless.
Corrosion Resistance Properties
Monel is renowned for its specific resistance capabilities:
- Seawater: Exceptional resistance to rapidly flowing seawater and marine atmosphere.
- Hydrofluoric Acid: One of the few alloys resistant to HF acid in all concentrations up to the boiling point.
- Reducing Acids: Excellent resistance to sulfuric and hydrochloric acids under reducing conditions.
- Alkalies: Highly resistant to caustic alkalies and salts.
- Stress Corrosion Cracking: Virtually immune to chloride-ion stress corrosion cracking, a common failure mode for stainless steels.
Why Choose Stellar Alloys for Monel Products?
Stellar Alloys provides reliable nickel alloy solutions for critical applications.
- Comprehensive Inventory: Extensive stock of Monel 400 and K500 pipes, plates, and bars.
- Certified Quality: Materials supplied with Mill Test Certificates (EN 10204 3.1) per ASTM/ASME standards.
- Global Logistics: Expertise in exporting to over 40 countries with proper packaging.
- Technical Support: Metallurgical assistance for selecting the right grade (400 vs K500).
- Custom Fabrication: Cutting, machining, and threading services available in-house.
Quality Assurance & Testing
We verify material quality through comprehensive testing:
- Positive Material Identification (PMI)
- Mechanical Testing (Tensile, Yield, Hardness)
- Intergranular Corrosion Testing
- Hydrostatic Testing for pipes
- Ultrasonic Testing (UT)
- Visual & Dimensional Inspection
- Third-party inspection (TPI) services
Stock Availability
We maintain ready stock for quick delivery:
- Monel 400 Seamless Pipes, Plates, Rounds
- Monel K500 Round Bars, Pump Shafts
- Monel R-405 Hex Bars for Machining
- Monel Fittings Elbows, Flanges, Tees
Frequently Asked Questions
Monel is a nickel-copper alloy containing approximately 63-67% nickel and 28-34% copper. It also contains small amounts of iron, manganese, carbon, and silicon to enhance its properties.
Monel 400 is the standard alloy with high strength and corrosion resistance. Monel K500 has added aluminum and titanium, which allows it to be precipitation hardened (aged), resulting in 2-3 times the tensile strength of Monel 400 while maintaining similar corrosion resistance.
Yes, Monel can be welded using gas tungsten arc welding (GTAW/TIG), gas metal arc welding (GMAW/MIG), and shielded metal arc welding (SMAW). It requires clean surfaces and appropriate filler metals (e.g., ERNiCu-7).
Generally, yes. Monel 400 is widely considered one of the best materials for marine environments, resisting biofouling and pitting. Inconel 625 is also excellent but is often more expensive and used for more extreme temperature/corrosion combinations.
It offers a unique combination of high strength and resistance to corrosion by rapidly flowing seawater. It is also resistant to chloride-ion stress corrosion cracking, which plagues many stainless steels in marine settings.
Yes, Monel 400 is slightly magnetic at room temperature (Curie temperature is around 20-50°C). Monel K500 is virtually non-magnetic, even at very low temperatures.
The cost is driven by the high price of Nickel and Copper, specialized melting and processing requirements, and lower production volumes compared to stainless steel.
Yes, but it work-hardens rapidly. It requires sharp tools, slower speeds, and heavy feeds. Monel R-405 is a free-machining grade designed specifically for automatic screw machines.
Common uses include marine propeller shafts, pumps, valves, heat exchangers, chemical processing equipment (especially for HF acid), gasoline tanks, and electrical/electronic components.
Monel has significantly better corrosion resistance in reducing environments (acids) and seawater. It is stronger than 316 but also more expensive. Stainless 316 is generally better in oxidizing environments (like nitric acid).