Monel Thick Wall 400 Alloy Steel Tube

Monel thick wall 400 Alloy tube

Monel 400 (UNS N04400) is an alloy mainly composed of nickel (Ni ≥ 63%) and copper (Cu 28-34%). It is an ideal choice for harsh environments due to its excellent corrosion resistance, high strength and excellent processing performance. Its thick-walled tubes (wall thickness is usually ≥5mm) are designed for high pressure, high corrosion and extreme temperature conditions, and are widely used in oil and gas, marine engineering, chemical industry and nuclear power.

Core characteristics
Monel 400 thick-walled tubes are particularly outstanding in corrosion resistance. They can resist non-oxidizing media such as seawater, salt spray, sulfuric acid, and hydrofluoric acid. At the same time, they are resistant to chloride ion stress corrosion cracking (better than stainless steel 316L) and remain stable at high temperatures below 480°C. It has excellent mechanical properties, with a tensile strength of 480-620 MPa in the annealed state and 620-900 MPa after cold working. It is non-magnetic and suitable for precision instruments or MRI equipment. In terms of physical properties, the density is 8.8 g/cm³, the melting point is 1300-1350°C, and it still has good toughness in low temperature environment (-200°C).

Specifications and processes
The conventional outer diameter of thick-walled pipes covers 10-500 mm (customizable to 1000 mm), wall thickness 5-50 mm (maximum 100 mm), and length 1-6 m (can be butt-jointed to 12 m). The manufacturing process is mainly hot-extruded seamless pipes (ASTM B165) to ensure the density of the organization; ERW welded pipes (ASTM B725) are suitable for medium and low pressure scenarios to reduce costs. The supply status is divided into annealed state (excellent corrosion resistance, easy processing) and cold-processed state (high strength) to meet different needs.

Monel 400 Tubes Specifications

Specifications for Monel 400 Tubes. If any specification is not mentioned here, please use the contact button for quick quote.

Specifications	ASTM B163, B730 / ASME SB163, B730
Dimensions	ASTM, ASME and API
Size	6.35 OD (mm) To 152 OD (mm)
Schedule	SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Type	Seamless / ERW / Welded / Fabricated / LSAW Tubes
Form	Round Tubes, Custom Tubes, Square Tubes, Rectangular Tubes, "U" Shape, Hydraulic Tubes
Length	Single Random, Double Random & Cut Length.
End	Plain End, Beveled End, Treaded

Monel 400 seamless tube chemical composition

Grade	Si	C	Mn	S	Fe	Cu	Ni	Cr
Monel 400	0.50 maximum	0.30 maximum	2.00 maximum	0.24maximum	2.50 maximum	28.0-34.0	63.00 minimum	–

Nickel alloy 400 tube thickness

NOMINAL	Outer Dia INCHES	10	10S	40S & STD	40	80	80S & E.H.	160
1/8	.405	.049	.049	.068	.068	.095	.095
1/4	.540	.065	.065	.088	.088	.119	.119
3/8	.675	.065	.065	.091	.091	.126	.126
1/2	.840	.083	.083	.109	.109	.147	.147	.187
3/4	1.050	.083	.083	.113	.113	.154	.154	.218
1	1.315	.109	.109	.133	.133	.179	.179	.250
1 1/4	1.660	.109	.109	.140	.140	.191	.191	.250
1 1/2	1.900	.109	.109	.145	.145	.200	.200	.281
2	2.375	.109	.109	.154	.154	.218	.218	.343
2 1/2	2.875	.120	.120	.203	.203	.276	.276	.375
3	3.500	.120	.120	.216	.216	.300	.300	.437
3 1/2	4.000	.120	.120	.226	.226	.318	.318
4	4.500	.120	.120	.237	.237	.337	.337	.531
4 1/2	5.000			.247			.355
5	5.563	.134	.134	.258	.258	.375	.375	.625
6	6.625	.134	.134	.280	.280	.432	.432	.718
7	7.625			.301			.500
8	8.625	.148	.148	.322	.322	.500	.500	.906
9	9.625			.342			.500
10	10.750	.165	.165	.365	.365	.593	.500	1.125
11	11.750			.375			.500
12	12.750	.180	.180	.375	.406	.687	.500	1.312
14	14.000	.250	.188	.375	.437	.750	.500	1.406
16	16.000	.250	.188	.375	.500	.843	.500	1.593
18	18.000	.250	.188	.375	.562	.937	.500	1.781

GNEE Group thick wall 400 Alloy Steel tube Factory Environment

GNEE Group thick wall 400 Steel tube Packaging

GNEE Group thick wall 400 Alloy tube Testing

Is Monel 400 suitable for seawater applications?
Yes, Monel 400 has excellent seawater corrosion resistance, which makes it ideal for marine heat exchangers and cooling systems.
How is 400 alloy different from other nickel alloys?
The real advantage of 400 alloy is its corrosion resistance and strength in acidic and alkaline environments. It is not only beautiful in alloy, but other pure nickel and nickel alloy compositions focus more on performance in oxidation and high temperature conditions.

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