Name: ASTM B725 UNS N04400 Welded Nickel Alloy Pipe Monel 400 Welded Pipe
Brand: Yuhong Group Co.,Ltd
SKU: ASTM B725 Monel 400 Welded Nickel Alloy Pipe
Price: 150000 USD
Availability: InStock

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ASTM B725 UNS N04400 Welded Nickel Alloy Pipe Monel 400 Welded Pipe

Product Details:

Place of Origin:	CHINA
Brand Name:	YUHONG
Certification:	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:	ASTM B725 Monel 400 Welded Nickel Alloy Pipe

Payment & Shipping Terms:

Minimum Order Quantity:	1000kgs
Packaging Details:	Ply-wooden Case/ Bundle with plastic Cap
Delivery Time:	7days
Payment Terms:	T/T,L/C

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Detailed Product Description

Product Name:	Nickel Alloy Welded Pipe	Standard:	ASTM B725, ASME SB725
Grade:	UNS N04400, Monel 400, 2.4360	OD:	1/2" ~24"
WT:	Sch 5S To Sch XXS	Length:	Single Random, Double Random & Cut Length
Pipe End:	Plain End, Beveled End	NDT:	UT, RT, PT, PMI
Application:	Oil And Gas Industry, Chemical Industry, Marine Platform, Etc
Highlight:	ASTM B725 nickel alloy pipe , Monel 400 welded pipe , UNS N04400 nickel pipe

ASTM B725 Monel 400 / UNS N04400 / 2.4360 Welded Pipe Nickel Alloy Pipe

Welded pipe under ASTM B725 means the longitudinal seam is fusion welded without the addition of filler metal (autogenous welding), and the entire pipe is subsequently annealed to optimize performance. ASTM B725 UNS N04400 welded pipe is a standard‑grade, seam‑welded tube made of Monel 400 alloy, used primarily in marine, chemical, and HF acid services where corrosion resistance is critical and seamless pipe is not economically required.

Monel 400 is renowned for:

Excellent resistance to seawater and marine atmospheres (low corrosion rate, no stress corrosion cracking).
Resistance to hydrofluoric acid (all concentrations up to boiling point) and sulfuric/hydrochloric acids in reducing conditions.
Good resistance to neutral and alkaline salt solutions.

Equivalent Grade of ASTM B725 Welded Monel 400 Nickel Alloy Pipe

Materials	Trademark	UNS	Werkst. Nr.	Density (g/cm3)	BS	ASTM Standard
Alloy 400	Monel 400	N04400	2.4360	8,83	3072-6 NA13	ASME SB/ASTM B163, B165, B725, B730, B127, B164, B366, B164

Chemical Properties % of ASTM B725 UNS N04400 Welded Nickel Alloy Pipe Monel 400 Welded Pipe

Monel 400	Ni	C	Al	Mn	Si	Fe	Cu	S	Cr
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	–

Mechanical Characteristics of ASTM B725 UNS N04400 Welded Nickel Alloy Pipe Monel 400 Welded Pipe

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 %

Manufacturing Differences of Welded Pipe: One Seam vs. Two Seams

One‑Seam Pipe (Standard)

Two‑Seam Pipe (Large Diameter, by agreement)

Process: Continuous roll forming from a single coil of strip.
Weld seam: One longitudinal autogenous TIG weld.
Advantages:
- Lower cost, faster production.
- Fewer potential weld defects.
- Better roundness and straightness.
Limitation: Maximum OD limited by strip width (typically ≤ NPS 12 for Monel).

Process:
1. Two Monel plates are cut to size and rolled into half‑cylinders (180° each).
2. The two half‑shells are tack‑welded along both longitudinal edges.
3. Both seams are welded (usually from inside and outside) – either automatically or manually.
4. The entire pipe is annealed (heat treated) after welding.
Challenges:
- Requires precise fit‑up to avoid misalignment.
- Two seams mean twice the weld length, increasing inspection and risk of defects.
- Post‑weld annealing is even more critical to homogenize both HAZs.