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 Round Bar - UNS N04400 ASTM B164, 6 to 200 mm
Monel 400 round bar (also Monel 400 round bars, Monel 400 bar, Monel 400 rod, Alloy 400 round bar, UNS N04400 round bar, Nickel 400 round bar, Werkstoff 2.4360 round bar) is the rod-form product of the nickel-copper alloy covered by ASTM B164. Supplied hot-worked or cold-worked, 6 mm to 200 mm diameter, 3 m to 6 m length, in as-worked, stress-relieved or annealed condition, with EN 10204 type 3.1 or 3.2 MTC. Feeds bolt, stud-bolt, anchor-bolt, threaded-rod and forging manufacture, plus HF alkylation pump shafts, valve stems and marine hardware. Chemistry matches B127 plate and B564 forgings; 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 Product Types for Monel 400 Round Bar
ASTM B164 covers UNS N04400 (and free-machining UNS N04405) as rod, bar and cold-worked wire. Round product ships in three conditions: hot-worked, cold-worked (each as-worked or stress-relieved) and annealed. The standard also covers rings, disks and forging-quality material. Hot-worked bar is the default for large-diameter machined parts and feedstock for forged flanges to B564; cold-drawn stress-relieved bar ships for pump shafts and bolt blanks rolled to F468.
Monel 400 Round Bar Size Range and Diameter Tolerances
Working envelope ex Mumbai stock. Diameter tolerance per B164 Table 5; h9 / h11 on centreless-ground stock. Length +25 / -0 mm random, +3 / -0 mm saw-cut. Straightness 1 mm/m cold-drawn, 3 mm/m black bar.
| Form | Diameter (mm) | Diameter (in.) | Length (m) | Mill route | Default surface |
|---|---|---|---|---|---|
| Cold-drawn bar | 6 to 25 | 0.236 to 1.000 | 3 to 6 | Cold-drawn stress-relieved | Bright drawn |
| Cold-drawn bar | 25 to 50 | 1.000 to 1.969 | 3 to 6 | Cold-drawn stress-relieved | Centreless ground or peeled |
| Hot-worked bar | 50 to 100 | 1.969 to 3.937 | 3 to 6 | Hot-worked annealed | Black bar or peeled |
| Hot-worked bar | 100 to 200 | 3.937 to 7.874 | 3 to 6 | Hot-worked annealed | Black bar |
Bar above 200 mm runs as forging billet to B564. Squares, hexagons and rectangles share B164 chemistry; ship to drawing.
Monel 400 Round Bar Chemistry per ASTM B164 (UNS N04400)
B164 chemistry matches B127 plate and B564 forgings; one heat, one MTC across forms. See chemical composition.
| Element | UNS N04400 (wt %) | Role |
|---|---|---|
| Nickel (Ni) | 63.0 min | FCC matrix, sets corrosion behaviour |
| Copper (Cu) | 28.0 to 34.0 | HF and seawater passivation partner |
| Iron (Fe) | 2.5 max | Solid-solution strengthener |
| Manganese (Mn) | 2.0 max | Deoxidiser |
| Carbon (C) | 0.3 max | Low for weldability and machinability |
| Silicon (Si) / Sulphur (S) | 0.5 / 0.024 max | Melt deoxidation; sulphur capped for hot-working |
PMI on every bar at receipt against MTC. Free-machining Monel R-405 (UNS N04405) at 0.025-0.060 percent S is bar only; not for sour service or HF acid.
Mechanical Properties of Monel 400 Round Bar per ASTM B164
ASTM B164 Table 1 sets the floor. Annealed bar at 70 ksi (480 MPa) tensile, 25 ksi (170 MPa) yield, 35% elongation feeds bolt and machined-part manufacture; cold-worked stress-relieved bar at 84 to 110 ksi (580 to 760 MPa) tensile ships where higher yield is needed without re-heat-treatment.
| Condition | Diameter | Tensile min | Yield min (0.2%) | Elongation min |
|---|---|---|---|---|
| Hot-worked / cold-worked, annealed | All sizes | 70 ksi (480 MPa) | 25 ksi (170 MPa) | 35% |
| Hot-worked as-worked / stress-relieved | Up to 305 mm | 80 ksi (552 MPa) | 40 ksi (276 MPa) | 30% |
| Cold-worked stress-relieved | 12.7 to 88.9 mm | 87 ksi (600 MPa) | 60 ksi (415 MPa) | 20% |
| Cold-worked stress-relieved | 88.9 to 101.6 mm | 84 ksi (580 MPa) | 55 ksi (380 MPa) | 20% |
| Cold-worked as-worked | Under 12.7 mm | 110 ksi (760 MPa) | 85 ksi (585 MPa) | 8% |
Annealed hardness B60 to B75 HRB; cold-worked rings and disks B75 to B95 HRB. Both clear the NACE MR0175 35 HRC ceiling. See mechanical properties.
Surface Finishes for Monel 400 Round Bar
Surface controls machining cost and seal performance; specify on the RFQ.
| Surface | Description | Typical Ra | Typical use |
|---|---|---|---|
| Black bar (HW) | As-hot-worked, mill oxide scale | not specified | Large machined parts, forging billet |
| Peeled | Lathe-peeled to remove decarb skin | 3.2 micrometre | Pump shaft blanks, shafting stock |
| Centreless ground | Through-feed ground to h9 / h11 | 0.8 to 1.6 micrometre | Valve stems, instrument shafts |
| Polished | Belt-polished after grinding | 0.4 micrometre | Pharma and food-grade parts |
| Bright drawn | Cold-drawn through die, no further finish | 1.6 micrometre | Bolt and stud blanks |
End condition: mill, square-sawn, chamfered or centred. Default square-sawn on cold-drawn, mill on black bar.
Applications for Monel 400 Round Bar
B164 bar is the input stock wherever the fluid attacks stainless but stays inside the nickel-copper passivation window:
- HF alkylation pump shafts and valve stems per API RP 751; cold-drawn stress-relieved bar at 60 ksi yield. See HF alkylation, HF acid.
- Bolt and stud-bolt feedstock rolled to F468 for hex bolts, heavy hex bolts, stud bolts, cap screws, anchor bolts.
- Valve stems and trim for HF, brackish-water and caustic-soda service; centreless-ground bar to h9.
- Marine hardware: propeller shafting, rudder stocks, non-magnetic fastener feedstock. See magnetic permeability, marine.
- Sour-service trim per NACE MR0175 / ISO 15156-3; below the 35 HRC ceiling in both conditions.
- Tube-sheet bolting and forging billet for flanges, fittings.
Certification, Traceability and Inspection
Every bar is heat-numbered and stamped with heat, bar number, spec, UNS, diameter and condition. EN 10204 type 3.1 ships as standard; type 3.2 (Lloyds, BV, DNV, TUV witness) on indent for nuclear, sour service and NORSOK.
| Certificate | What it covers | Typical use |
|---|---|---|
| EN 10204 type 3.1 | Heat-specific MTC, mill metallurgist sign-off | Standard commercial, refinery, marine, bolt feedstock |
| EN 10204 type 3.2 | 3.1 plus third-party inspector counter-signature | NACE sour service, nuclear, NORSOK, customer witness |
| PMI report | Hand-held XRF or OES verification of Ni and Cu | Receipt inspection, HF acid and sour service |
| UT report | Ultrasonic inspection per customer spec | Pump-shaft blanks, large-diameter forging billet |
Traceability heat to bar to drawing item to finished part on the MTC and bar stencil. NACE MR0175 shipments carry the compliance statement, hardness reading and heat-treat condition on the MTC.
Companion Pieces from the Same Heat
B164 round bar anchors a single-heat supply chain. Same heat, same MTC, downstream forms qualified to the same chemistry:
- Forged flanges per ASTM B564 from B164 billet to ASME B16.5 / B16.47. See flanges, forging.
- Bolts and stud bolts per ASTM F468 rolled from B164 bar; F468 grade 400 (80 ksi tensile, 40 ksi yield, 26% elongation) maps to the B164 cold-worked envelope. See bolts, stud bolts.
- Nuts per ASTM F467 upset from B164 bar; matching hex nuts, heavy hex nuts, lock nuts.
- Threaded rod per F468 from B164 bar; see threaded rod. Wire per B164 Table 2; see wire.
Frequently Asked Questions on Monel 400 Round Bar
What is Monel 400 round bar? Rod-form product of nickel-copper alloy UNS N04400 to ASTM B164. Diameter 6 to 200 mm, length 3 to 6 m, hot-worked or cold-worked, with black bar, peeled, centreless-ground, polished or bright-drawn surface. Input stock for bolts, pump shafts, valve stems and forged flanges.
What sizes of Monel 400 round bar are available? 6 to 200 mm diameter ex Mumbai. Lengths 3 m and 6 m random; saw-cut on indent. Diameter tolerance per B164 Table 5; h9 / h11 on centreless-ground. Above 200 mm runs as forging billet to B564.
Is Monel 400 round bar stocked annealed? Yes. Hot-worked annealed bar at 70 ksi (480 MPa) tensile, 25 ksi (170 MPa) yield per B164 Table 1 is the default for bolt manufacture. Cold-worked stress-relieved bar at 60 ksi yield ships for pump shafts; cold-worked as-worked reaches 110 ksi under 12.7 mm.
Does Monel 400 round bar clear NACE MR0175 for sour service? Yes. Both annealed and cold-worked B164 bar sit below the 35 HRC ceiling under NACE MR0175 / ISO 15156-3. Sour-service bar ships EN 10204 type 3.2 with the NACE statement on the MTC. See sour service.
Related Pages
Standards: ASTM B164, B127, B564, F468, NACE MR0175, DIN 17743. Forms: plate, threaded rod, wire, forging, flanges, tubing. Fasteners: bolts, hex bolts, stud bolts. Applications: HF alkylation, sour service, marine, vs stainless, data sheet, pricing, main reference.
Request a Quote. Monel 400 round bar to ASTM B164, UNS N04400, 6 to 200 mm, hot-worked or cold-worked, EN 10204 3.1 or 3.2 MTC: drawing and quantity to info@torqbolt.com or WhatsApp +91-22-66157017. Heat-numbered MTC and Mumbai ex-stock price within one working day.
References. ASTM B164 Tables 1, 5. ASTM B127. ASTM B564. ASTM F468 / F468M. NACE MR0175 / ISO 15156-3. EN 10204. API RP 751. ASME B16.5. DIN 17743.
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