Alloy 400 Tube
Austenitic / Duplex Steel / Nickel Alloy / Cobalt AlloyMTSCO is an international supplier specializing in piping systems made of stainless steel, duplex steel, and nickel alloys. Since entering the industrial metals sector in 2006, we have consistently served global industrial projects across industries such as chemicals, energy equipment, pressure equipment, and seawater desalination.
Send Inquiry
ASTM B165 Nickel Alloy 400 UNS N04400 Seamless Tube for Marine Applications
Specification Of Alloy 400 Seamless Tube
| Item | Specification |
| Material Grade | Alloy 400 / Monel 400 / UNS N04400 |
| Product Type | Nickel Alloy Seamless Tube |
| Standard | ASTM B165 / ASME SB165 / As Required |
| Size Range | OD 3.18mm–38mm, WT 0.5mm–3mm, Length ≤30m |
| Process | Cold Drawn / Annealed |
| Surface | Bright Annealed / Polished / As Required |
| Inspection | Appearance, Dimension, PMI, UT, ET, Hydrostatic Test, Mechanical Test, Chemical Analysis |
| Certificates | ISO / PED / NORSOK M650 Available / As Required |
| Package | End Protection / Woven Bags / Wooden Cases / As Required |
| Application | Marine Service, Chemical Processing, Seawater System, Heat Exchanger, Corrosion Resistant Tubing |
About MTSCO
MTSCO is an international supplier specializing in piping systems made of stainless steel, duplex steel, and nickel alloys. Since entering the industrial metals sector in 2006, we have consistently served global industrial projects across industries such as chemicals, energy equipment, pressure equipment, and seawater desalination.
Our partner manufacturing facilities possess 35 years of experience in piping production, enabling MTSCO to provide comprehensive supply solutions that include pipes, tubes, fittings, flanges, and related metal products. For complex, multi-specification international orders, MTSCO assists clients in standardizing specifications, materials, packaging, and shipping schedules. We help reduce the communication costs associated with multi-vendor procurement and provide support regarding project documentation, quality audits, and sustainable supply chain requirements.
Product Advantages
· Authoritative Certifications & Consistent Quality
MTSCO holds international certifications such as ISO and PED and operates a mature, stable production system. We have successfully passed numerous factory audits conducted by global clients, consistently earning their trust.
· Premium Raw Materials
All raw materials are sourced from renowned steel mills—such as Tsingshan, Fukai, and Yongxing—ensuring stable, reliable chemical composition and mechanical properties, thereby guaranteeing product quality at the source.
· End-to-End Quality Traceability System
Products undergo 100% inspection, with complete inspection records and on-site photos stored in our internal system to ensure full-process traceability.
· Professional Technical Support & Project Experience
We provide comprehensive engineering documentation and technical support to facilitate the smooth progress of client projects; MTSCO has accumulated extensive application experience through collaborations with globally renowned clients.

Chemical Composition Of Alloy 400 Seamless Tube
| Grade | Si max | Mn max | Ni | Cu max | Fe max |
| Alloy 400/N04400 | 1 | 2 | ≥63 | 28-34 | 3 |
Physical Property Of Alloy 400 Seamless Tube
| Grade | Physical Property | ||
| Y.S | T.S | EL. | |
| Alloy 400/N04400 | ≥170 | ≥480 | ≥35 |
FAQ
Q1: Can these be purchased together with fittings and flanges?
A1: Yes. MTSCO offers integrated supply solutions for pipes, tubes, fittings, flanges, and plates, allowing clients to standardize materials, specifications, packaging, and shipping arrangements.
Q2: What environments are Monel 400 seamless tubes suitable for?
A2: Monel 400 is commonly used in seawater, brine, chemical media, and certain acidic or alkaline environments. Specific suitability should be confirmed based on media composition, temperature, pressure, and project standards.
Q3: What tests are typically performed on these tubes before shipment?
A3: Standard tests include visual inspection, dimensional checks, PMI, UT, ET, hydrostatic testing, mechanical property testing, and chemical composition analysis. Specific testing procedures may be conducted in accordance with ASTM standards and customer requirements.
Manufacturing Experience
Plant Area
Max Diameter of Welded Pipe
Annealing Furnace Length
Nickel Alloy
NI-MO: N10001,N10665,N10675...
NI-CR-MO: N10276,N06022,N06035,N06455,N06002...
NI-CR-MO-CU: N06030,N06200,N08031,N08825,N08020...
NICR-MO-W: N06230...
NICKEL: N02200,N02201...
NI-CU: N04400,N05500...
NI-CR-FE: N06600,N06601,N06690,N08800,N08810,N08811...
NI-CR-MO-NB: N06625,N07718...
Austenitic
304/L/H/N, 316/L/H/N/Ti, 321/H, 309/H, 310S, 347/H, 317/L, 904L...
Duplex Steel
31803, 32205, 32750, 32760...
Cobalt Alloy
Alloy 188/ UNS R30188, Alloy L-605/ UNS R30605, Alloy S-816, Alloy 6B, UMCo50, FSX-414, MP-159...
Send Inquiry by feedback form learn more about product detail, price, etc.
Your email address will not be published. Required fields are marked *