Monel Supplier – Monel 400, K-500 & 405 Pipe, Plate, Bar, Fittings & Fasteners
ASC LLP, Mumbai, supplies Monel nickel-copper alloys – Monel 400, age-hardened Monel K-500, free-machining Monel 405 / R-405 and Monel 401 – as seamless and welded pipe and tube, plate, sheet, bar, wire, fittings, flanges and fasteners, to ASTM / ASME specifications with EN 10204 3.1 certificates. Monel is part of our nickel & nickel alloy range.
What is Monel?
Monel is a family of nickel-copper alloys – about two-thirds nickel and one-third copper – not a steel. It is best known for its resistance to seawater, brine, hydrofluoric acid and alkalis, its toughness down to cryogenic temperatures, and its strength up to about 480 °C. Monel K-500 adds aluminium and titanium so it can be age-hardened to roughly three times the yield strength of Monel 400.
Monel Product Directory – All Forms & Grades
Choose a product form and grade to see chemistry, mechanical properties, sizes and specifications.
| Product form | Grades & pages |
| Pipes & tubes | Monel seamless pipes · Monel welded pipes · Monel 400 pipes · Monel K-500 pipes |
| Plates & sheets | All Monel plates · Monel 400 plates · Monel 405 plates · Monel K-500 plates |
| Bars & rods | All Monel bars · Monel 400 bar |
| Fittings | All Monel fittings · Monel 400 (B366) · Monel 405 (B366) · Monel R-405 (B366) · Monel 401 forged · Monel K-500 · Monel 500 (B164) |
| Flanges | All Monel flanges · Monel 400 · Monel 401 · Monel 405 · Monel R-405 · Monel K-500 · Monel R450 |
| Fasteners | All Monel fasteners · Monel 400 · Monel K-500 · Monel 405 · Monel R-405 · Monel 401 |
| Related | Nickel & nickel alloys · Inconel · Hastelloy |
Monel Wires
Monel Coiled Tubes
Monel Pipe Sizes & Wall Thickness (ASME B36.19, inches)
| NPS | OD (in) | SCH 5S | SCH 10S | SCH 40S | SCH 80S |
| ½” | 0.840 | 0.065 | 0.083 | 0.109 | 0.147 |
| ¾” | 1.050 | 0.065 | 0.083 | 0.113 | 0.154 |
| 1″ | 1.315 | 0.065 | 0.109 | 0.133 | 0.179 |
| 1½” | 1.900 | 0.065 | 0.109 | 0.145 | 0.200 |
| 2″ | 2.375 | 0.065 | 0.109 | 0.154 | 0.218 |
| 3″ | 3.500 | 0.083 | 0.120 | 0.216 | 0.300 |
| 4″ | 4.500 | 0.083 | 0.120 | 0.237 | 0.337 |
| 6″ | 6.625 | 0.109 | 0.134 | 0.280 | 0.432 |
| 8″ | 8.625 | 0.109 | 0.148 | 0.322 | 0.500 |
Monel 400 seamless pipe to ASTM B165 and welded pipe to ASTM B725. Instrument and heat-exchanger tube to ASTM B163 / B165 in OD × wall sizes.
Monel Grades We Supply
| Grade | UNS / W.Nr. | Key feature | Typical use |
| Monel 400 | N04400 / 2.4360 | Solid-solution Ni-Cu, general-purpose | Seawater piping, HF and caustic service, heat exchangers |
| Monel K-500 | N05500 / 2.4375 | Age-hardened with Al + Ti; very high strength | Pump shafts, subsea bolting, valve trim, oil-well tools |
| Monel 405 | N04405 | 400 with added sulphur – free machining | Screw-machine parts, nuts, valve components |
| Monel R-405 | N04405 | Trade name for free-machining 405 | Machined fittings and fasteners |
| Monel 401 | N04401 | Lower-nickel Ni-Cu | Electrical and electronic components |
ASTM Specifications for Monel by Product Form
| Product form | Monel 400 / 405 | Monel K-500 |
| Seamless pipe & tube | ASTM B165, B163 | By agreement / B163 type |
| Welded pipe & tube | ASTM B725, B730 | – |
| Plate, sheet, strip | ASTM B127 | By agreement |
| Bar, rod, wire | ASTM B164 | ASTM B865 |
| Butt-weld fittings | ASTM B366 | ASTM B366 (by agreement) |
| Forgings & flanges | ASTM B564 | ASTM B564 / B865 |
| Fasteners | ASTM F468 / F467 (Grade 400 / 405) | ASTM F468 / F467 (Grade 500) |
ASME equivalents use the “SB” prefix (SB165, SB127, SB164, SB366, SB564, SB865).
Mechanical Properties of Monel 400 & K-500
| Grade & condition | Tensile strength (min) | Yield strength (min) | Elongation (min) |
| Monel 400 – annealed tube / plate (B165, B127) | 483 MPa (70 ksi) | 193 MPa (28 ksi) | 35% |
| Monel 400 – F468 bolts ¼”–¾” | 552 – 896 MPa (80 – 130 ksi) | 276 MPa (40 ksi) | 20% |
| Monel K-500 – age-hardened bar (B865, typical) | 965 MPa (140 ksi) | 690 MPa (100 ksi) | 20% |
| Monel K-500 – F468 Grade 500 bolts | 896 – 1,241 MPa (130 – 180 ksi) | 621 MPa (90 ksi) | 20% |
Values depend on product form, size and condition – always check the specific ASTM standard and the mill certificate. See our grade pages for full data.
Chemical Composition of Monel Grades
| Element (wt %) | Monel 400 | Monel K-500 | Monel 405 |
| Nickel (Ni) | 63.0 min | 63.0 – 70.0 | 63.0 min |
| Copper (Cu) | 28.0 – 34.0 | Balance (≈ 27 – 33) | 28.0 – 34.0 |
| Aluminium (Al) | – | 2.30 – 3.15 | – |
| Titanium (Ti) | – | 0.35 – 0.85 | – |
| Iron (Fe) | 2.5 max | 2.0 max | 2.5 max |
| Manganese (Mn) | 2.0 max | 1.5 max | 2.0 max |
| Carbon (C) | 0.3 max | 0.25 max | 0.3 max |
| Silicon (Si) | 0.5 max | 0.5 max | 0.5 max |
| Sulphur (S) | 0.024 max | 0.01 max | 0.025 – 0.060 |
Physical Properties
| Property (approx.) | Monel 400 | Monel K-500 |
| Density | 8.80 g/cm³ | 8.44 g/cm³ |
| Melting range | 1,300 – 1,350 °C | 1,315 – 1,350 °C |
| Modulus of elasticity | ≈ 179 GPa | ≈ 179 GPa |
| Thermal conductivity | ≈ 22 W/m·K | ≈ 17 W/m·K |
| Magnetic | Slightly magnetic at room temperature | Non-magnetic to about −100 °C |
Where Monel Works – and Where It Doesn’t
- Excellent: flowing seawater and brine, hydrofluoric acid, caustic soda and other alkalis, neutral salts, many organic acids; resists chloride stress-corrosion cracking.
- Acceptable with care: dilute, de-aerated sulphuric and hydrochloric acids.
- Avoid: nitric acid and other oxidising acids, ferric and cupric chlorides, aerated hot mineral acids, and sulphur-bearing gases above about 370 °C.
- Stagnant seawater: pitting can occur under deposits – design out crevices and stagnant zones.
Applications of Monel
| Industry | Typical Monel uses | Grade |
| Marine & shipbuilding | Seawater piping, pump and propeller shafts, valves, fasteners | 400, K-500 |
| Oil & gas | Sour-gas and offshore valves, subsea bolting, drill-collar and well tools | K-500 |
| Chemical & refining | HF alkylation units, caustic evaporators, brine heaters | 400 |
| Desalination & power | Feed-water heaters, condensers, seawater pumps | 400 |
| Valves & pumps | Trim, stems, shafts and machined parts | K-500, 405 |
Monel 400, K-500 or 405 – Which Grade?
- Monel 400: the standard choice for corrosion service – pipe, plate, fittings and flanges in seawater, HF and caustic systems.
- Monel K-500: when you need high strength as well – shafts, bolting and valve parts.
- Monel 405 / R-405: for high-volume machined parts where free machining matters.
Why Choose ASC LLP as Your Monel Supplier?
- All grades and forms: Monel 400, K-500, 405, R-405 and 401 in pipe, plate, bar, fittings, flanges and fasteners.
- Certified material: ASTM / ASME specifications with EN 10204 3.1 certificates and heat traceability.
- Matched packages: pipe, fittings, flanges and fasteners in the same grade.
- Cut-to-size and small orders, plus export packing for shipments worldwide.
Send grade, form, size and quantity to sales@amardeepsteel.com or call 022-67439130.
Frequently Asked Questions – Monel
Is Monel a steel?
No. Monel is a nickel-copper alloy containing about 63–70% nickel and 27–34% copper. It contains very little iron and is classed as a nickel alloy, not a steel.
What is the difference between Monel 400 and Monel K-500?
Monel 400 is a solid-solution nickel-copper alloy. Monel K-500 adds about 3% aluminium and 0.6% titanium and is age-hardened, giving roughly three times the yield strength with similar corrosion resistance.
What is Monel used for?
Monel is used for seawater piping, pump shafts, valves and fasteners in marine and offshore service, hydrofluoric acid and caustic handling in chemical plants, and desalination and power-plant heat exchangers.
Which ASTM standards cover Monel?
Monel 400 is covered by ASTM B165 (seamless pipe and tube), B725 (welded pipe), B127 (plate), B164 (bar), B366 (fittings) and B564 (flanges and forgings). Monel K-500 bar is covered by ASTM B865, and Monel fasteners by ASTM F468 and F467.
Is Monel resistant to acids?
Monel resists hydrofluoric acid, alkalis and many organic acids very well, and dilute de-aerated sulphuric and hydrochloric acids with care. It is not suitable for nitric acid or other oxidising acids.
Is Monel magnetic?
Monel 400 is slightly magnetic at room temperature because its Curie point is close to ambient. Monel K-500 is non-magnetic down to about −100 °C.
