Alloy 400 Tube
Austenitic / Duplex Steel / Nickel Alloy / Cobalt AlloyMTSCO specializes in supplying piping systems made of stainless steel, duplex steel, and nickel alloys. Leveraging a robust supply chain network, we integrate pipes, fittings, flanges, and related components to ensure coordinated management from raw material sourcing to final product delivery.
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ASTM B366 Alloy 400 UNS N04400 Nickel Alloy Butt Weld Fitting Solution Annealed
Why Choose MTSCO for Nickel Alloy Butt-Weld Fittings?
MTSCO specializes in supplying piping systems made of stainless steel, duplex steel, and nickel alloys. Leveraging a robust supply chain network, we integrate pipes, fittings, flanges, and related components to ensure coordinated management from raw material sourcing to final product delivery. With extensive experience in global projects across the chemical, energy, offshore engineering, and industrial equipment sectors, we are well-equipped to handle complex project requirements. We offer a comprehensive range of products, including pipes, tubes, fittings, and flanges. Please feel free to contact us for your needs.
Factory Overview
Hongdi is a specialized pipe fitting manufacturer and a key strategic partner of MTSCO, boasting years of experience in producing butt-weld fittings. The facility is equipped with CNC machining centers, forming equipment, heat treatment furnaces, and laboratory testing instruments, enabling a complete production workflow that covers forming, heat treatment, machining, testing, and packaging.
Specification Table
Item | Specification |
Product Type | Nickel Alloy Butt Weld Fitting |
Material Grade | Alloy 400 / Monel 400 / UNS N04400 |
Standard | ASTM B366 / ASME B16.9 / MSS SP-43 / As Required |
Fitting Types | Elbow, Tee, Reducer, Cap, Cross, Stub End |
Size Range | 1/2"–80" / DN15–DN2000 |
Wall Thickness | SCH 5S–SCH 160 / As Required |
Manufacturing Process | Cutting / Forming / Solution Annealing / Machining / Beveling |
Surface | Pickled / Sand Blasted / As Required |
Inspection | Appearance, Dimension, PMI, PT, RT, Hydrostatic Test, Mechanical Test |
Certificates | ISO / PED / M650 / As Required |
Package | Surface Protection / Bubble Bag / Wooden Case / Pallet |
Application | Marine Service, Chemical Processing, Seawater System, Corrosive Fluid Pipeline |
Solution Annealing Process
Solution annealing is a critical heat treatment process in the production of nickel alloy fittings. By precisely controlling heating temperatures and cooling rates, this process optimizes the material's microstructure, relieves stresses induced during fabrication, and ensures stable material properties.
For Alloy 400 butt-weld fittings, solution annealing enhances overall performance post-fabrication, making them better suited for long-term service in environments involving seawater or chemical media.

Full-Process Quality Traceability System
MTSCO has implemented a comprehensive traceability system covering raw materials, production, quality inspection, and shipping. Every step is documented, starting with the verification of raw materials upon arrival. Throughout the stages of cutting, forming, heat treatment, machining, surface treatment, and final inspection, process cards are used to track production steps, while our QC team photographs and records key milestones.
Before shipment, MTSCO verifies product markings, quantities, packaging conditions, and inspection documentation to ensure full alignment with order specifications. These complete production and inspection records provide customers with clear visibility into the manufacturing and quality control processes.
FAQ
Q1: Can third-party inspections be arranged?
A1: Yes. MTSCO cooperates fully with customer requests for pre-shipment inspections by third-party agencies such as SGS, TÜV, and BV.
Q2: What is the difference between PT and RT inspections?
A2: PT is primarily used to detect open surface defects, such as surface cracks and minor flaws; RT is mainly used to inspect for internal defects, such as internal discontinuities in welded areas.
Q3: Can Alloy 400 butt-weld fittings be customized?
A3: Yes. MTSCO can accommodate customer requirements regarding dimensions, wall thickness, end preparation, surface finish, and special testing specifications.
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...
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