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
ASTM B165 - Monel 400 / UNS N04400 Seamless Pipe & Tube Specification
ASTM B165 (also ASTM B165 Monel 400, ASTM B165 seamless pipe, ASTM B165 seamless tube, ASTM B165 UNS N04400, Monel 400 seamless pipe ASTM B165) is the specification for seamless nickel-copper alloy pipe and tube in UNS N04400 (Monel® 400, Werkstoff 2.4360, DIN 17743 NiCu30Fe). The standard covers material hot-extruded or cold-drawn from a single solid billet, supplied in the annealed condition and hydrostatic-tested on every length. Welded product falls under ASTM B725 / B730; condenser tube for welding into a tubesheet is covered by ASTM B163, a separate specification. Monel® is a registered trademark of Special Metals Corporation; TorqBolt is not authorized by, affiliated with or endorsed by Special Metals.
Scope and Size Range
ASTM B165 covers seamless pipe dimensioned to NPS schedules and seamless tube dimensioned by OD and wall. Pipe runs from NPS 1/4 to NPS 8 in Schedule 5S, 10S, 40 and 80 as standard, with larger sizes by agreement. Tube is specified by OD and minimum wall, typically 1/8 to 6 inches OD with wall from 0.035 inch upward. Length is single random (16 to 22 feet) or double random (22 to 44 feet); cut-to-length on order.
| Parameter | Seamless Pipe (NPS) | Seamless Tube (OD x wall) |
|---|---|---|
| Size range | NPS 1/4 to NPS 8 | 1/8 to 6 in. OD; wall 0.035 in. up |
| Schedules | SCH 5S, 10S, 40, 80 | By OD and wall (BWG or decimal) |
| OD tolerance | ASME B36.10 / B36.19 | ASTM B165 Table 3 |
| Wall tolerance | +22 / -12.5 percent (hot); +/- 10 percent (cold, by agreement) | Same |
| Condition | Annealed standard; stress-relieved by agreement | Same |
Chemistry per ASTM B165 (UNS N04400)
The Monel 400 chemistry under ASTM B165 is identical to B164 (rod, bar, wire), B127 (plate, sheet, strip), B564 (forgings) and F468 (bolts). Cobalt is counted as nickel. Element-by-element treatment is on the chemical composition page.
| Element | ASTM B165 (weight percent) | Role |
|---|---|---|
| Nickel + Cobalt | 63.0 - 70.0 | FCC matrix; corrosion floor |
| Copper | 28.0 - 34.0 | Solid-solution partner |
| Iron | 2.5 max | Residual from melt |
| Manganese | 2.0 max | Deoxidiser, sulphur sink |
| Carbon | 0.30 max | Solid-solution strengthening |
| Silicon | 0.50 max | Deoxidiser |
| Sulphur | 0.024 max | Weldability limit |
Mechanical and Hydrostatic Requirements
Annealed UNS N04400 under ASTM B165 must meet 70 ksi (483 MPa) minimum tensile, 28 ksi (193 MPa) minimum yield (0.2 percent offset) and 35 percent minimum elongation in 2 inches (50 mm). Stress-relieved condition is offered where higher yield is needed. Every length is hydrostatic-tested using the Barlow formula P = 2 S t / D with allowable fibre stress S = 13,800 psi (95 MPa) for annealed Monel 400, held at least five seconds. A non-destructive electric test (eddy-current or ultrasonic) may be substituted by purchaser-supplier agreement. Flattening and flaring tests are run on tube; reverse-bend is run on thin-wall tube to demonstrate ductility.
| Property | Annealed | Stress-relieved |
|---|---|---|
| Tensile, min | 70 ksi (483 MPa) | 85 ksi (586 MPa) |
| Yield (0.2 percent), min | 28 ksi (193 MPa) | 55 ksi (379 MPa) |
| Elongation in 2 in., min | 35 percent | 15 percent |
| Hydrostatic fibre stress S | 13,800 psi (95 MPa) | 17,000 psi (117 MPa) |
| NDE alternative | Eddy-current / ultrasonic (ASTM E213 / E309) | Same |
Each length carries continuous stencilling with ASTM B165, UNS N04400, size or OD x wall, heat number and supplier mark. Mill chemistry is reported by OES (ASTM E1086) with C, S, N, O by ASTM E1019. General service ships against EN 10204 type 3.1; pressure-equipment and sour-service orders against type 3.2. NACE MR0175 compliance is declared on the MTC for sour duty (see NACE MR0175 / ISO 15156).
ASTM B165 vs B163 vs B564 - Which Spec Applies
Three ASTM specs cover Monel 400 in piping shapes; confusing them is a recurring procurement error. Chemistry is identical UNS N04400; the manufacturing route and end use differ. ASTM B165 is general-service seamless pipe and tube. ASTM B163 is seamless condenser and heat-exchanger tube for welding or expansion into a tubesheet (eddy-current default). ASTM B564 is forgings: weld-neck flanges, blind flanges, valve bodies, fittings forged from billet. A typical assembly weld-couples B165 pipe to a B564 flange; the heat trace runs through both certificates.
Related Pages
Forms: seamless pipe, tubing, fittings, flanges, forging.
Standards: ASTM B163, ASTM B164, ASTM B127, ASTM B564, ASTM F468, ASTM F467, UNS N04400, DIN 17743, NACE MR0175.
Chemistry / properties: chemical composition, mechanical properties, corrosion resistance, heat treatment, HF acid resistance.
Frequently Asked Questions
What does ASTM B165 cover? Nickel-copper alloy seamless pipe and tube in UNS N04400, hot-extruded or cold-drawn from a solid billet, annealed. Welded product is excluded.
ASTM B165 vs ASTM B163 - which one? B165 is general-service seamless pipe and tube. B163 is seamless condenser and heat-exchanger tube for welding or expansion into a tubesheet. Same chemistry, different end use.
What is the tensile strength of B165 Monel 400 pipe? 70 ksi (483 MPa) min tensile, 28 ksi (193 MPa) min yield, 35 percent min elongation in 2 inches (annealed).
Is hydrostatic test mandatory? Yes, at fibre stress 13,800 psi (95 MPa) for annealed UNS N04400, five-second minimum hold. Eddy-current or ultrasonic NDE may be substituted by agreement.
Request a Quote
For ASTM B165 Monel 400 seamless pipe or seamless tube in UNS N04400, send NPS or OD x wall, schedule, length, quantity and certification class (EN 10204 type 3.1 or 3.2) to info@torqbolt.com or WhatsApp +91-22-66157017. Ex-Mumbai price and heat-numbered MTC inside one working day. Domestic India 3 to 7 working days; export through JNPT. Full Monel 400 reference on the main reference page.
References: ASTM B165 (UNS N04400 Seamless Pipe and Tube); ASTM B163 (Condenser and Heat-Exchanger Tube); ASTM B564 (Nickel Alloy Forgings); ASTM E213, E309 (NDE of tubular products); ASTM E1019, E1086 (chemistry); ASME B36.10 / B36.19; EN 10204; NACE MR0175 / ISO 15156-3.
Satisfaction Survey
