Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Monel 400 Wire - Spring, Welding (ERNiCu-7) and Fine Wire, UNS N04400
Monel 400 wire (also Monel 400 spring wire, Monel 400 welding wire, ERNiCu-7, Alloy 400 wire, UNS N04400 wire, Werkstoff 2.4360 wire) is the cold-drawn wire form of the nickel-copper alloy covered by ASTM B164 and, in welding-filler form, by AWS A5.14 ERNiCu-7. Supplied in three categories: cold-drawn spring wire in annealed through spring tempers; welding filler wire as cut TIG rod and MIG spool for joining B127 plate, B165 pipe, B564 forgings and B164 bolting; and fine wire for marine instrumentation, sealing rings and mesh. Diameter 0.5 mm to 10 mm, EN 10204 type 3.1 or 3.2 MTC, NACE MR0175 compliant for sour-service spring duty. Alloy is UNS N04400. Monel® is a registered trademark of Special Metals Corporation; TorqBolt is not authorized by, affiliated with or endorsed by Special Metals.
ASTM B164 Scope and Wire Categories for Monel 400
ASTM B164 covers UNS N04400 and N04405 as hot-worked and cold-worked rod, bar and cold-worked wire. Wire ships cold-drawn in coil, in B164 Table 2 conditions: annealed, quarter hard, half hard, hard, spring. The same chemistry feeds the welding filler grade AWS A5.14 ERNiCu-7. Three working categories ex Mumbai stock: cold-drawn spring wire (0.5 to 10 mm); welding filler wire (ERNiCu-7 TIG rod and MIG spool for UNS N04400 base metal under ASME Section IX); fine instrumentation wire (0.5 to 1.6 mm, tight diameter tolerance).
Cold-Drawn Spring Wire Tempers per ASTM B164 Table 2
Temper is set by spring design stress and wrapping-test pass criterion. Annealed forms cleanly with no springback; spring temper holds design stress but cannot be re-formed without intermediate annealing.
| Temper | Cold-work pass | Typical use | Forming |
|---|---|---|---|
| Annealed (soft) | Final anneal after draw | Weld rod, forming wire, fastener feedstock | Free-bending, weldable |
| Quarter hard | Light cold-draw | Mesh, light springs, instrument leads | Bendable, light forming |
| Half hard | Medium cold-draw | Spring washers, brackish-water mesh | Limited forming |
| Hard | Heavy cold-draw | Stressed springs, mesh in flow | Wrapping test only |
| Spring | Maximum cold-draw | HF acid valve springs, marine instrument coils | Set-form, no rework |
Spring temper is age-stable at ambient; service above 230 C drops strength as cold-work recovers. For higher stressed springs use Monel K-500 (N05500).
Welding Filler Wire (AWS A5.14 ERNiCu-7)
ERNiCu-7 is the AWS A5.14 grade for the Monel 400 nickel-copper welding filler used in GTAW (TIG) and GMAW (MIG) of UNS N04400: HF vessel seams, tube-sheet welds, weld-overlay on carbon-steel companion flanges and pump-body repair. See welding. Stick-electrode equivalent is ENiCu-7 per AWS A5.11.
| Form | Diameter | Length / spool | Process |
|---|---|---|---|
| TIG cut rod | 1.6, 2.0, 2.4, 3.2 mm | 914 mm (36 in.), 5 kg carton | GTAW |
| MIG spool | 0.9, 1.0 mm | 4.5 / 11.3 kg metal spool | GMAW |
| MIG spool | 1.2 mm | 11.3 / 22.7 kg metal spool | GMAW |
| Sub-arc coil | 2.4, 3.2 mm | 25 / 50 kg coil | SAW |
Each spool or carton ships heat-numbered with EN 10204 type 3.1 as standard; type 3.2 on indent. ASTM A604 vacuum-fusion hydrogen control on indent for high-restraint root passes.
Fine Wire and Instrumentation
Fine wire below 1.6 mm runs cold-drawn through diamond dies with intermediate anneals to hold diameter tolerance close to 0.02 mm. Applications: thermocouple lead wire for HF acid and seawater duty where stainless leads fail; marine sensor leads; sealing rings for pharma and HF reactor flanges; brackish-water mesh and filter screen (plain Dutch and twilled Dutch at 30 to 200 mesh); legacy sutures and surgical wire. Ships annealed for weave and forming; harder tempers to drawing.
Mechanical Properties by Temper
ASTM B164 sets the annealed floor at 70 ksi (480 MPa) tensile minimum, 28 ksi (193 MPa) yield and 35 percent elongation. Spring temper sits at the top of the cold-work envelope. Specify temper and verify on MTC.
| Temper | Tensile, ksi (MPa) | Elongation, min | Hardness, typical |
|---|---|---|---|
| Annealed (soft) | 70 to 90 (480 to 620) | 35% | 60 to 75 HRB |
| Quarter hard | 85 to 105 (585 to 725) | 20% | 80 to 90 HRB |
| Half hard | 100 to 120 (690 to 825) | 10% | 92 to 100 HRB |
| Hard | 115 to 135 (790 to 930) | 4% | 20 to 26 HRC |
| Spring | 130 to 145 (895 to 1000) | 2% (wrapping) | 26 to 32 HRC |
Spring-temper hardness clears the NACE MR0175 nickel-copper ceiling of 35 HRC; cold-drawn spring wire is acceptable for sour-service spring duty with EN 10204 3.2 plus NACE compliance statement. See mechanical properties.
Chemistry per ASTM B164 (UNS N04400)
Wire chemistry matches B164 rod and B127 plate. ERNiCu-7 follows the same envelope with tightened titanium and aluminium for deoxidation. See chemical composition.
| Element | UNS N04400 wire (wt %) | ERNiCu-7 weld wire add |
|---|---|---|
| Nickel + Cobalt (Ni+Co) | 63.0 min | 62.0 to 69.0 |
| Copper (Cu) | 28.0 to 34.0 | 26.0 to 32.0 |
| Iron (Fe) | 2.5 max | 2.5 max |
| Manganese (Mn) | 2.0 max | 4.0 max |
| Carbon (C) | 0.3 max | 0.15 max |
| Silicon (Si) | 0.5 max | 1.25 max |
| Sulphur (S) | 0.024 max | 0.015 max |
| Titanium (Ti) | not specified | 1.5 to 3.0 (deoxidiser) |
| Aluminium (Al) | not specified | 1.25 max |
PMI at receipt on every coil and spool; verify Ni and Cu against MTC. Free-machining R-405 (N04405) is bar stock only.
Applications for Monel 400 Wire
Wire runs where the nickel-copper passivation is required at a small section:
- HF acid valve springs in HF alkylation service per API RP 751; see HF acid resistance.
- Brackish and seawater mesh, filter screen and demister pads on offshore platforms; see seawater corrosion.
- Welding filler wire (ERNiCu-7) for joining B127 plate, B165 pipe, B564 forgings and bolting.
- Fastener feedstock for cold-headed hex bolts and stud bolts to ASTM F468.
- Marine instrumentation sensor leads and thermocouple wire; see magnetic permeability.
Certification, Traceability and Inspection
Every coil, spool and carton is heat-numbered and tagged with heat number, spec, UNS N04400, temper or grade, diameter and nominal weight. EN 10204 type 3.1 mill certificate ships as standard; type 3.2 third-party witness (Lloyds, BV, DNV, TUV) on indent for nuclear, sour-service and NORSOK. Wire is tensile-tested, wrapping-tested where invoked, PMI-verified and dimensionally inspected. Traceability chain: heat to coil to drawing item to spring or weld joint. NACE MR0175 spring duty: MTC carries compliance statement, hardness and final temper. Welding wire ships with AWS A5.14 batch chemistry; ASTM A604 hydrogen on indent.
Frequently Asked Questions on Monel 400 Wire
What tempers of Monel 400 spring wire are available? Five cold-worked tempers under ASTM B164 Table 2: annealed (soft), quarter hard, half hard, hard and spring. Annealed runs about 70 ksi tensile with 35 percent elongation; spring temper runs about 130 to 145 ksi for stressed valve springs and mesh. Diameter 0.5 to 10 mm on standard coil weights.
What is ERNiCu-7 welding wire? AWS A5.14 grade for the Monel 400 welding filler used for GTAW and GMAW of UNS N04400. Common sizes: 1.6, 2.0, 2.4, 3.2 mm TIG cut rod; 0.9, 1.0, 1.2 mm MIG spool.
What spool weights are stocked? 4.5, 11.3 and 22.7 kg metal spools for MIG; 5 kg cartons of 914 mm cut TIG rods; 25 / 50 kg coils for sub-arc. EN 10204 type 3.1 standard, type 3.2 on indent.
Does Monel 400 spring wire clear NACE MR0175? Yes. Spring temper at about 26 to 32 HRC sits below the NACE MR0175 / ISO 15156-3 nickel-copper ceiling of 35 HRC. Sour-service duty ships EN 10204 type 3.2 plus NACE compliance statement. See sour service applications.
Related Pages
Standards: ASTM B164, B127, B564, F468, NACE MR0175, DIN 17743. Properties: chemistry, mechanical, welding, magnetic permeability, corrosion, HF acid. Forms: round bar, threaded rod, plate, pipe, forging, flanges. Fasteners: bolts, hex bolts, stud bolts. Applications: HF alkylation, sour service, marine, vs K-500, pricing, main reference.
Request a Quote. For Monel 400 wire to ASTM B164 (any temper) or AWS A5.14 ERNiCu-7 welding filler, 0.5 to 10 mm diameter, EN 10204 type 3.1 or 3.2 MTC: send drawing, temper, diameter and coil weight to info@torqbolt.com or WhatsApp +91-22-66157017. Mumbai ex-stock price within one working day.
References. ASTM B164 Tables 1, 2. AWS A5.14. AWS A5.11. ASTM A604. NACE MR0175 / ISO 15156-3. EN 10204. API RP 751.
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