Monel 400 (The Seawater & Acid Specialist) – Exotic Metals LLP
Monel 400 (UNS N04400) is a solid-solution alloy that can
only be hardened by cold working. It is legendary for its resistance to rapidly
flowing seawater and its unique ability to handle hydrofluoric acid and boiling
hydrofluoric acid. It serves as the backbone of the marine and chemical processing
industries due to its excellent weldability and toughness over a wide temperature
range, from cryogenic to 1000°F.
Specifications
| Specification |
Details |
| UNS / W.Nr. |
N04400 | 2.4360 / 2.4361 |
| Standards |
ASTM B164 (Bars), ASTM B127 (Plate), ASTM B165 (Seamless Pipe), ASTM B366
(Fittings) |
| Compliance |
NACE MR0175 (For oil & gas environments) |
Available Sizes & Product Types
- Piping: Seamless and Welded pipes from 1/4" NB to 24" NB
- Long Products: Round Bars (3mm to 400mm), Hexogen Bars for valve stems, and Square
Bars
- Flat Products: Precision Strips, Coils, and heavy-wall Plates (up to 150mm
thickness)
- Custom: Wire Mesh for marine filters and Forged Rings for heat exchangers
Chemical Composition (%)
| Element |
Composition (%) |
| Ni (+Co) |
63.0 Min |
| Cu |
28.0 - 34.0 |
| Fe |
2.5 Max |
| Mn |
2.0 Max |
| Si |
0.5 Max |
| C |
0.3 Max |
| S |
0.024 Max |
Mechanical Properties
| Property |
Annealed |
Hardened (Cold Worked) |
| Tensile Strength |
550 MPa (80 ksi) |
700 MPa (100 ksi) |
| Yield Strength |
240 MPa (35 ksi) |
550 MPa (80 ksi) |
| Density |
8.80 g/cm³ |
8.80 g/cm³ |
Weight Chart: Monel 400 Round Bar (Theoretical)
| Nominal Size |
OD (mm) |
WT (mm) |
Weight (kg/m) |
| ½″ |
21.3 |
2.77 |
1.27 |
| 1″ |
33.4 |
3.38 |
2.49 |
| 2″ |
60.3 |
3.91 |
5.44 |
| 3″ |
88.9 |
5.49 |
10.92 |
| 4″ |
114.3 |
6.02 |
15.67 |
Monel K500 (High-Strength Age-Hardenable Alloy)
Monel K500 (UNS N05500) combines the excellent corrosion
resistance of Monel 400 with the added advantages of greater strength and hardness.
By adding aluminum and titanium to the nickel-copper base, this alloy is
"age-hardened," resulting in three times the yield strength of Alloy 400. It is
non-magnetic down to -101°C, making it indispensable for electronic sensors and
non-magnetic drill collars in the oil and gas industry.
Specifications
| Specification |
Details |
| UNS / W.Nr. |
N05500 | 2.4375 |
| Standards |
ASTM B865 (Bars/Forgings), QQ-N-286 (Federal Spec) |
Available Sizes & Product Types
- Forged Products: Forged Bars, Blocks, and Shafts (up to 6000mm length)
- Fasteners: High-tensile Bolts, Studs, and heavy-duty Washers for subsea use
- Tubes: Capillary and Hydraulic tubes for downhole instrumentation
- Structural: Angle / Channel and Custom Fabricated components for pump shafts
Chemical Composition (%)
| Element |
Composition (%) |
| Ni (+Co) |
63.0 Min |
| Cu |
27.0 - 33.0 |
| Al |
2.3 - 3.15 |
| Ti |
0.35 - 0.85 |
| Fe |
2.0 Max |
| Mn |
1.5 Max |
Mechanical Properties (Age Hardened)
| Property |
Value |
| Tensile Strength |
965 MPa (140 ksi) |
| Yield Strength |
690 MPa (100 ksi) |
| Elongation |
20% |
| Hardness |
280 Brinell (Min) |
Weight Chart: Monel K500 Square Pipe (Reference)
| Size (mm) |
Wall (mm) |
Weight (kg/m) |
| 25 x 25 |
2.0 |
1.62 |
| 50 x 50 |
3.0 |
4.65 |
Monel R405 (The Free-Machining Grade)
Monel R405 (UNS N04405) is the free-machining version of
Monel 400. It is a nickel-copper alloy with a controlled amount of sulfur added to
provide sulfide inclusions that act as chip breakers during machining. While its
corrosion resistance is identical to Monel 400, its enhanced machinability makes it
the superior choice for high-volume production of fasteners, valve parts, and screw
machine products.
Specifications
| Specification |
Details |
| UNS / W.Nr. |
N04405 | 2.4361 |
| Standards |
ASTM B164 (Section 1), ASME SB164 |
Available Sizes & Product Types
- Precision Rods: Bright polished Round and Hexogen Bars for CNC machining
- Fasteners: Specialized Nuts, Screws, and Rivets
- Fittings: Pipe Fittings and Forged Fittings (Elbows / Tees) requiring intricate
internal threading
- Forms: Circle, Gasket, and Strips for automatic stamping
Chemical Composition (%)
| Element |
Composition (%) |
| Ni (+Co) |
63.0 Min |
| Cu |
28.0 - 34.0 |
| S |
0.025 - 0.060 |
| Fe |
2.5 Max |
| Mn |
2.0 Max |
| Si |
0.5 Max |
Mechanical Properties (Hot Finished)
| Property |
Value |
| Tensile Strength |
515 - 585 MPa |
| Yield Strength |
170 - 275 MPa |
| Machinability Rating |
15% better than Alloy 400 |
Weight Chart: Monel R405 Hexogen Bar
| A/F Size (mm) |
Weight (kg/m) |
A/F Size (inch) |
Weight (kg/m) |
| 17 |
2.21 |
5/8" |
1.90 |
| 24 |
4.40 |
1" |
4.85 |
| 36 |
9.90 |
1.5" |
10.91 |
Comparison of Product Types for Exotic Metals LLP
| Feature |
Monel 400 |
Monel K500 |
Monel R405 |
| Best For |
Chemical Piping & Tanks |
Pump Shafts & Drill Collars |
Screw Machine Fasteners |
| Machinability |
Moderate |
Difficult (work hardens) |
Excellent |
| Magnetic Property |
Slightly Magnetic |
Non-Magnetic |
Slightly Magnetic |
| Welding |
Excellent |
Good |
Moderate |
