Excerpt:
Monel 405 (UNS N04405) supplier — free-machining version of Monel 400. Excellent for automatic screw machine parts, valve trim, pump shafts in marine and chemical applications.
Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer and global supplier of premium Monel 405 (UNS N04405) round bars, plates, sheets and forgings. Monel 405 is the free-machining grade of the Monel 400 family, with a controlled sulfur addition (0.25-0.60%) that dramatically improves machinability while retaining the outstanding corrosion resistance of Monel 400 in seawater, acids and alkalis — the first choice for precision valve, pump and fastener components.
Standards
- ASTM B164 — Rod, Bar, Wire (Hot-Worked / Annealed)
- ASTM B127 — Plate, Sheet, Strip
- UNS N04405 / W.Nr. 2.4055
- ASME SB164 — Pressure Vessel Applications
Precise ASTM Chemical Composition (%)
| Element | Range / Max |
|---|---|
| Nickel (Ni) | 63.0 min (63 – 70) |
| Copper (Cu) | 28.0 – 34.0 |
| Sulfur (S) | 0.25 – 0.60 |
| Iron (Fe) | 2.5 max |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 0.5 max |
| Carbon (C) | 0.15 max |
Physical & Mechanical Properties
| Property | Typical Value (Min) |
|---|---|
| Tensile Strength (Annealed Bar, ASTM B164) | 483 MPa (70 ksi) |
| Yield Strength (0.2% Offset) | 172 MPa (25 ksi) |
| Elongation (in 2") | 35% |
| Hardness (Brinell) | ≤ 160 HB |
| Density | 8.80 g/cm³ |
| Melting Range | 1300 – 1350 °C |
| Max Continuous Service Temperature | ~590 °C (1100 °F) |
Depth Characteristics
- Free-Machining Performance: The controlled sulfur addition acts as a chip-breaker, enabling high-speed screw machining, drilling and tapping with excellent surface finish.
- Seawater Corrosion Resistance: Virtually immune to chloride stress-corrosion cracking; excels in flowing seawater, brackish water and marine atmospheres.
- Acid & Alkali Resistance: Excellent in hydrofluoric acid, dilute hydrochloric/sulfuric acids and hot concentrated caustic alkalis.
- Mechanical Properties Matching Monel 400: Strength and ductility remain essentially equal to Monel 400 in the annealed condition.
- Non-Magnetic: Remains non-magnetic in service, ideal for instrument housings and marine electronic components.
Manufacturing Process — Forging & Heat Treatment
Monel 405 is melted in electric-arc furnaces with AOD refining and carefully controlled sulfur addition to guarantee consistent machinability. The alloy is hot-forged at 870–1175°C and finished above 700°C, then annealed at 760–870°C followed by air cooling or water quenching to soften for machining. Bars are straightened, peeled or centerless ground to tight tolerances, with sulfur distribution verified by spectroscopy for uniform machining behavior.
Testing & Inspection Methods — PMI / UT / RT
- PMI (Positive Material Identification): 100% XRF/arc-OES verification of Ni, Cu, S, Fe on all delivered material.
- UT (Ultrasonic Testing): Full-length ultrasonic examination of bar per ASTM E213 where internal soundness is critical.
- RT (Radiographic Testing): Radiographic inspection of forged and welded components per ASME Section V when specified.
- Plus: tensile/hardness testing, machinability verification batches, intergranular corrosion tests, grain-size evaluation and 100% dimensional inspection; EN 10204 3.1/3.2 mill certificates supplied.
High-Frequency Application Scenarios
- Marine Valves & Pumps: Valve stems, seats, pump shafts and impellers for seawater and offshore service.
- Fasteners: High-volume bolts, nuts, studs and threaded fittings produced on automatic screw machines.
- Chemical Processing: Instrumentation fittings, flow-meter components and valve trim in HF acid and alkali plants.
- Oil Refinery: Control-valve parts, thermowells and gauge components in corrosive process streams.
- Marine Electronics: Housings and connectors requiring non-magnetic, corrosion-resistant properties.
6+ Professional FAQs
1. What is the difference between Monel 400 and Monel 405?
Monel 405 adds 0.25-0.60% sulfur, which improves machinability without changing corrosion resistance; mechanical properties remain essentially identical.
2. Why add sulfur to Monel 405?
Sulfur forms sulfide inclusions that break chips during machining, preventing built-up edge and producing smoother surfaces at higher cutting speeds.
3. Is Monel 405 as corrosion-resistant as Monel 400?
Yes — in virtually all media (seawater, HF acid, caustic, dilute mineral acids) the corrosion performance matches Monel 400.
4. Can Monel 405 be welded?
It can be welded, but the sulfur addition slightly reduces weldability; for welded pressure parts Monel 400 is usually preferred.
5. Is Monel 405 magnetic?
No — it is non-magnetic in the annealed condition, suitable for electronic and instrument applications.
6. Which ASTM standards cover Monel 405?
ASTM B164 covers rod, bar and wire; ASTM B127 covers plate, sheet and strip.
7. What heat treatment does Monel 405 require after forging?
Annealing at 760–870°C with air cooling or water quenching restores softness and optimum machinability.
Supply List
- Round Bar: Φ6mm – Φ300mm, peeled/ground, annealed
- Hex / Square Bar: For fastener production
- Plate / Sheet: Thickness 1mm – 50mm
- Forgings: Valve bodies, flanges, custom components
- Wire: For springs and fasteners
Need certified Monel 405 for your marine or chemical components? Contact Shanghai Hangbo Alloy Group for instant quotations, stock availability and mill certificates — quick response within 10 minutes.
