Monel 400 Tubes & Tubing Supplier in India — ASTM B165 UNS N04400 Seamless & Welded

Monel 400 Seamless Tubes vs Welded Tubes

Seamless tubes are produced from solid bar stock by extrusion and cold drawing, leaving no weld seam. With no line of weakness along the wall, they are the preferred option for high-pressure, high-purity and safety-critical service such as instrumentation, hydraulics and heat-exchanger duty. Welded tubes (ERW / EFW) are formed by rolling strip or plate and welding the longitudinal seam, then sizing and annealing. They are more economical and well suited to lower-pressure, structural and large-diameter applications. Both variants meet the same UNS N04400 chemistry and the relevant ASTM / ASME standards, so the choice usually comes down to operating pressure, criticality and budget.

Monel 400 Pipes and Tubes Specification

Our Monel 400 tubing is manufactured and tested to internationally recognised standards and supplied in a full range of schedules, lengths and end finishes. The table below summarises the standard specification we stock and produce against.

Specifications	ASTM B163, B165, B725, B730 / ASME SB163, SB165, SB725, SB730
Size	15 NB to 150 NB
Schedule	SCH20, SCH30, SCH40, STD, SCH60, SCH80, XS, SCH120, SCH140, SCH160, XXS
Length	Single Random, Double Random & Required Length
Type	Cold Drawn / Seamless / ERW / Welded / Capillary Tubes
End	Plain End, Beveled End, Threaded

Monel Alloy 400 Tube Equivalent Standard Grade

Monel 400 is referenced under several international designations. If your drawing or enquiry uses any of the equivalents below, we can supply tubing to the same chemistry and properties.

STANDARD	UNS	WNR.	AFNOR	EN	JIS	BS	GOST
Monel 400	N04400	2.4360	NU-30M	NiCu30Fe	NW 4400	NA 13	МНЖМц 28-2,5-1,5

Monel 400 Tubes Chemical Composition

Monel 400 contains a minimum of 63% nickel and 28–34% copper, with small additions of iron, manganese and carbon. This nickel-copper balance is what gives the alloy its characteristic resistance to seawater and reducing acids.

Grade	Ni	C	Al	Mn	Si	Fe	Cu	S
Monel 400	63.0 min	0.3 max	0.50 max	2.0 max	0.5 max	1.0 – 2.5	28.0 – 34.0	0.02 max

Monel 400 Tubing Mechanical Properties

In the annealed condition, Monel 400 tubing offers a minimum yield strength of 240 MPa, minimum tensile strength of 550 MPa and elongation around 40%, combined with a high melting point of roughly 1350 °C.

Density	Melting Point	Yield Strength (0.2% Offset)	Tensile Strength	Elongation
8.8 g/cm³	1350 °C (2460 °F)	Psi – 35,000, MPa – 240	Psi – 80,000, MPa – 550	40 %

Monel 400 vs Monel K500 — Key Differences

Monel K500 (UNS N05500) is an age-hardened version of Monel 400, with roughly three times the yield strength thanks to additions of aluminium and titanium. Choose Monel 400 where corrosion resistance in seawater and chemical processing is the priority; choose Monel K500 where high strength and wear resistance matter, such as pump shafts and fasteners. For higher-temperature or more aggressively oxidising service, customers often compare Monel 400 against Inconel 625 tubes and Hastelloy C276 tubes.

Monel 400 Seamless Tube – Thermal Properties

The following table lists electrical resistivity, thermal conductivity, coefficient of thermal expansion and specific heat for Monel 400 across a wide temperature range, useful for heat-exchanger and condenser design.

Temp (°F)	Temp (°C)	Electrical Resistivity (ohm-circ mil/ft)	Thermal Conductivity (W/m·°C)	Expansion (µm/m·°C)	Specific Heat (J/kg·°C)
-320	-200	205	—	—	—
-300	-180	—	16.5	11.1	223
-200	-130	—	18.2	11.4	320
-100	-70	—	19.8	12.1	378
70	21	307	22.0	—	427
200	100	322	24.0	14.2	445
400	200	337	26.9	15.2	459
600	300	346	30.1	15.7	470
800	400	355	33.4	16.1	—
1000	500	367	36.5	16.3	—
1200	600	379	39.4	16.6	—
1400	700	391	42.4	17.0	—
1600	800	403	45.5	17.4	—
1800	900	415	48.8	17.7	—
2000	1000	427	—	18.1	—

Monel 400 Tube Size Chart

We stock and produce Monel 400 tubes from fine capillary sizes upward. Non-standard outer diameters, wall thicknesses and lengths can be produced to order — share your drawing and we will confirm availability.

Outer Diameter (OD)	Wall Thickness	Inner Diameter (ID)	Length
0.8 mm	0.1 mm	0.6 mm	1000 mm
2.5 mm	0.18 mm	2.14 mm	500 mm
2.57 mm	0.15 mm	2.27 mm	1000 mm
1.27 mm	0.25 mm	0.77 mm	100 mm
0.5 mm	0.146 mm	0.208 mm	1000 mm

ASTM B165 UNS N04400 Material Tensile Strength

Tensile behaviour varies with product condition and test temperature. The data below covers forged, cold-drawn and annealed material, including cryogenic test points relevant to low-temperature service.

Condition	Tensile Strength (ksi)	Temp (°F)	Yield Strength (ksi)	Reduction (%)	Elongation (%)
Forged	92.00	70	67.00	72.7	31.0
Forged	128.25	-297	91.50	71.8	44.5
Forged	142.00	-423	96.40	61.0	38.5
Cold Drawn	103.80	Room	93.70	71.0	19.0
Cold Drawn	117.45	-110	100.85	70.2	21.8
Cold Drawn	103.40	Room	93.30	72.5	17.3
Annealed	78.65	70	31.30	75.0	51.5
Annealed	115.25	-297	49.50	73.9	49.5

ASME SB 165 N04400 – Compression & Tensile Properties

Cold-drawn, hot-rolled and annealed Monel 400 differ markedly in yield and compression behaviour, as shown below.

Condition	Tensile Strength (ksi)	Yield Strength (0.01%)	Yield Strength (0.2%)	Elongation (%)	Compression Yield (0.01%)	Compression Yield (0.2%)
Cold Drawn	97	75	87	27.0	58	81
Hot Rolled	84	37	41	39.5	33	38
Annealed	78	28	33	44.0	19	28

Monel 400 Welded Tube – Applications

Thanks to its corrosion resistance and strength retention, Monel 400 welded tube is used across demanding process and energy industries, including:

• Sour gas handling systems
• Aerospace components
• Chimney and exhaust linings
• Jet engine exhaust units
• Chemical processing equipment
• High-performance automotive exhaust systems
• Nuclear waste processing units

Industries We Supply Monel 400 Tubes To

Our Monel 400 tubing serves a broad customer base across process, marine and energy sectors:

• Oil & Gas: downhole tubing, sour-service lines and offshore platform piping.
• Marine & Desalination: seawater heat exchangers, condensers and brine handling, where Monel 400 resists pitting at all temperatures.
• Chemical Processing: handling of hydrofluoric, sulphuric and hydrochloric acids in non-oxidising, deaerated conditions.
• Power Generation: feedwater heaters and condenser tubing.
• Pulp, Paper & Pharmaceuticals: corrosion-resistant process lines.

For more aggressive or higher-temperature duty we also supply Incoloy 825 tubes, Copper Nickel 90/10 tubes and Nickel 200 tubes.

Monel 400 Tube Corrosion Resistance

Monel 400 offers excellent resistance to seawater and marine atmospheres (no pitting at any temperature), hydrofluoric acid (up to 85% concentration at room temperature), dilute non-oxidising sulphuric acid, dilute non-aerated hydrochloric acid, and alkalis and caustic solutions. It is not recommended for nitric acid, oxidising acid mixtures or moist chlorine gas, where the high copper content makes it vulnerable.

Monel 400 Tube Testing & Inspection

Every batch of Monel 400 tubing is supplied with full documentation and is tested before dispatch. Standard testing includes transverse tension testing, guided-bend (flattening/flaring) testing and hydrostatic testing, with non-destructive options such as eddy-current and ultrasonic examination available on request. Positive Material Identification (PMI) and dimensional inspection confirm conformity to UNS N04400 chemistry and the required ASTM / ASME standard, and material is supplied with EN 10204 3.1 mill test certificates.

Monel Alloy 400 – Physical Properties

Property	Imperial Units	Metric Units
Density	0.318 lb/in³	8.8 g/cm³

Monel 400 Tubing – Pressure Rating

Approximate working pressures (psi) for Monel 400 instrumentation tubing by outer diameter and wall thickness are shown below. Use these as a design guide and confirm with your engineer for the specific service.

Tube OD (in.)	0.028″	0.035″	0.049″	0.065″	0.083″	0.095″	0.109″	0.120″
1/8	—	10100	—	—	—	—	—	—
1/4	3700	4800	7000	9500	—	—	—	—
5/16	—	3700	5400	7300	—	—	—	—
3/8	—	3100	4400	6100	—	—	—	—
1/2	—	2300	3200	4400	—	—	—	—
3/4	—	—	2200	3000	4000	4600	—	—
1	—	—	—	2200	2900	3400	3900	4300

UNS N04400 – Dimensional Tolerances

Outer-diameter and wall-thickness tolerances for Monel 400 tubing vary with size band, as listed below.

OD Range (in.)	Wall Thickness (in.)	Tolerance (± in.)
1/2 – 1	0.0025 – 0.0065	0.0005
1/2 – 1	0.0065 – 0.0134	0.0010
1 – 1.5	0.0025 – 0.0065	0.0008
1 – 1.5	0.0065 – 0.0134	0.0010
1.5 – 2	0.0025 – 0.0049	0.0010
1.5 – 2	0.0049 – 0.0083	0.0011
1.5 – 2	0.0083 – 0.0148	0.0012
2 – 2.5	0.0032 – 0.0065	0.0012
2 – 2.5	0.0065 – 0.0109	0.0013
2.5 – 3.5	0.0032 – 0.0165	0.0014
2.5 – 3.5	0.0165 – 0.0220	0.0020
3.5 – 5	0.0083 – 0.0165	0.0020
3.5 – 5	0.0165 – 0.0220	0.0025

Nickel Alloy 400 Annealed Tube – Weight Chart

Indicative weights per metre for annealed Monel 400 square tube are shown below; weights for round and rectangular sections are available on request.

Size (mm)	Wall (mm)	Weight (kg/m)
12.07 × 12.07	1.02	0.044
15 × 15	1.02	0.053
20 × 20	1.02	0.071
25 × 25	1.02	0.092
30 × 30	1.02	1.010
40 × 40	1.02	1.049
50 × 50	1.05	2.032
60 × 60	2.00	3.071
70 × 70	3.00	6.053
80 × 80	2.00	4.098
100 × 100	2.00	6.040

DIN 2.4360 Extruded Tube Dimensions

Extruded-tube dimensions by gauge for Werkstoff 2.4360 (Monel 400), covering regular, thin, extra-thin and ultra-thin wall ranges.

Gauge	OD Range (mm)	Regular Wall (mm)	Thin Wall (mm)	Extra Thin (mm)	Ultra Thin (mm)
30	0.0304 – 0.0317	0.0064 – 0.0089	—	—	—
28	0.0355 – 0.0368	0.0076 – 0.0102	—	—	—
27	0.0406 – 0.0419	0.0089 – 0.0115	0.0064 – 0.0089	—	—
25	0.0508 – 0.0520	0.0115 – 0.0140	0.0089 – 0.0114	—	—
23	0.0635 – 0.0647	0.0140 – 0.0165	0.0089 – 0.0114	—	0.0051 – 0.0102
22	0.0711 – 0.0723	0.0140 – 0.0165	0.0096 – 0.0121	0.0077 – 0.0102	0.0051 – 0.0102
20	0.0901 – 0.0914	0.0108 – 0.0165	0.0108 – 0.0134	—	—
17	1.0460 – 1.0485	0.0177 – 0.0229	0.0115 – 0.0152	0.0083 – 0.0127	0.0057 – 0.0102
14	2.0082 – 2.0133	0.0216 – 0.0292	0.0165 – 0.0229	0.0114 – 0.0165	0.0076 – 0.0134
11	3.0023 – 3.0073	0.0293 – 0.0368	0.0216 – 0.0292	—	—

Monel 400 Tube Packing & Delivery

Tubes are packed in wooden crates or steel bundles with a waterproof polythene inner lining. Each bundle is tagged with heat number, grade, size and standard. Export packing with a fumigation certificate is available. Lead time is typically 2–7 business days for standard stock sizes and 3–5 weeks for non-stock or special dimensions.

Get a Monel 400 Tube Price & Quote

As a Mumbai-based manufacturer and exporter, we hold ready stock of Monel 400 seamless and welded tubes and ship worldwide with full test certification. Share your size, wall thickness, quantity and standard and our team will revert with a competitive Monel 400 tube price list. Contact us or request a quote today.

FAQs About Monel 400 Tubes