ASTM B163 UNS N04400 Alloy Heat Exchanger Tube

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of astm b163 uns n04400 alloy heat exchanger tube in China. With abundant experience, we warmly welcome you to wholesale customized astm b163 uns n04400 alloy heat exchanger tube from our factory. For price consultation, contact us.

 

What is the ASTM B163 specification?

ASTM B163 is an industrial material standard covering seamless nickel alloy tubing-with an outside diameter not exceeding 76.2 mm (3 inches)-intended for use in condensers and heat exchangers, and it specifies rigorous requirements regarding chemical composition, mechanical properties, dimensional tolerances, hardness, and nondestructive testing.

 

ASME SB 163 N04400 Tubing Supplier and Manufacturer

With over 18 years of international export experience, GNEE supplies nickel alloy heat exchanger tubes to clients in more than 80 countries worldwide. Our market spans industrial nations and regions including the USA, Canada, Germany, Spain, the Netherlands, Italy, Turkey, South Korea, Vietnam, India, Pakistan, Saudi Arabia, the UAE, South Africa, and Brazil.

 

The ASTM B163 UNS N04400 alloy heat exchanger tube supplied by GNEE is a seamless nickel-copper alloy tube specifically designed for condensers and heat exchangers. Manufactured from high-quality, vacuum-melted nickel alloy billets, it undergoes processes including hot extrusion, multi-pass cold drawing/cold rolling, solution annealing, precision sizing, straightening, bright annealing, pickling and passivation, and final inspection.

Containing a minimum of 63% nickel (Ni) and 28%–34% copper (Cu), it exhibits a corrosion rate of less than 0.025 mm/year in flowing seawater and resists pitting, crevice corrosion, and chloride-induced stress corrosion cracking. Compared to traditional stainless steels and copper alloys, it offers significant long-term operational advantages.

 

After annealing, its tensile strength is ≥480 MPa, yield strength is ≥170 MPa, and elongation exceeds 35%. It maintains high mechanical strength across temperatures ranging from cryogenic conditions to approximately 540°C (1000°F). This effectively extends heat exchanger service life and reduces equipment maintenance downtime, making it widely applied in marine desalination, petrochemicals, the chlor-alkali industry, and power plant feedwater heating systems.

We support custom outer diameters (6 mm–114 mm) and wall thicknesses (0.8 mm–12 mm). Based on customer drawing requirements, we offer custom-length straight tubes or U-bent tube processing services. Upon customer request, we can also provide EN 10204 3.2 certificates as well as third-party inspection services from SGS, BV, TÜV, and others.

 

ASME SB163 / B165 Monel 400 Chemical Compositon:

GRADE	C	Mn	Si	S	Cu	Fe	Ni
Monel 400	0.30Max	2.00Max	0.5Max	0.24Max	28.0-34.0	2.50Max	63.00Min

 

Equivalent Grades for Monel 400 Seamless Tubes:

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
Monel 400	2.436	N04400	NW 4400	NA 13	МНЖМц 28-2,5-1,5	NU-30M	NiCu30Fe

 

ASME SB163 / B165 Monel 400 Mechanical Properties:

rade	Condition			Tensile Strength,min,psi(MPa)		Yield Strength,min,(0.2% offset),min,psi(MPa)		Elongation in 2 in. or 50 mm(or 4D),min,%
MONEL 400 (UNS N04400)	Annealed,5 in.(127mm) outside diameter and uner			70,000(480)		28,000(195)		35%
	Annealed,Over 5 in.(127 mm) outside diameter			70,000(480)		25,000(170)		35%
	Stress-Relieved,All sizes			85,000(585)		55,000(380)		15%

 

ASTM B163 UNS N04400 Tube Temperature Range

Property	Value
Operating Temperature	-200°C to 550°C (Typical Service)
Oxidation Resistance	Good up to approximately 550°C
Corrosion Resistance	Excellent resistance to seawater, hydrofluoric acid, alkalis, and chloride environments

 

Dimension Permissible in Outside Diameter,Wall Thickness and Length of ASTM B163 Standard Condenser and Heat Exchanger
Permissible Variations
Material	Nominal Outside Diameter, in.(mm)	Outside Diameter, in.(mm)		Wall Thickness,% Average Wall		Wall Thickness,% Minimum Wall		Length,in.(mm)
UNS N02200,UNS N02201,UNS N04400		Over	Under	Over	Under	Over	Under	Over	Under
	1/2 to 5/8 (12.7 to 15.9),excl	0.005(0.13)	0	12.5	12.5	25	0	1/8 (3.2)	0
	8/5 to 1-1/2 (15.9 to 38.1), incl	0.005(0.13)	0.005(0.13)	10	10	20	0
	Over 1-1/2 to 3 (38.1 to 76.2), incl	0.010(0.25)	0.010(0.25)	10	10	22	0	Under 30 ft (9.1m)↑

 

Applications of ASTM B163 UNS N04400 Alloy Tube:

Marine engineering and seawater piping systems;
Chemical and petrochemical processing equipment;
Feedwater heaters and heat exchangers in power generation.

If you're working on a project, let me know:What are the required dimensions (outer diameter and wall thickness)?What is the operating temperature and fluid medium?I can help verify if ASTM B163 Monel 400 is the best fit or help calculate pressure ratings.

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What is the difference between ASTM B163 and ASTM B165?

The main difference is their intended application and scope: ⁠ASTM B163 specifies seamless nickel and nickel alloy tubes for condensers and heat exchangers, while ASTM B165 covers cold-worked seamless nickel-copper alloy (Monel 400) pipe and tube for general service.

 

ASTM B163 UNS N04400 Alloy Tube price per kg

ASTM B163 UNS N04400 (Monel 400) alloy tube typically costs between $10 and $40 per kg, depending on order volume, manufacturing type (seamless or welded), and dimensions. Wholesale bulk rates can sometimes start as low as $3,000 to $12,500 per ton ($3 to $12.50 per kg), while specialized retail lengths or small-batch seamless condenser tubes scale higher.

 

Quality Control

Before leaving the factory, every batch of products undergoes 100% eddy current testing (ECT), hydrostatic testing, PMI (Positive Material Identification), chemical composition analysis, tensile testing, flattening testing, flaring testing, hardness testing, dimensional inspection, and surface inspection to ensure full compliance with ASTM B163 standards and customer technical specifications.

 

High-quality transport packaging

Plastic Pipe Caps: Secure plastic dust caps (typically blue) must be fitted to both ends of each pipe to prevent the ingress of dust, moisture, and foreign objects, and to protect the beveled or plain ends from impact damage.
Individual Protection:
Plastic Sleeves/Stretch Wrap: Each pipe should be individually encased in a plastic film sleeve or bubble wrap.
Separators/Cushioning: Wooden spacers or EPE foam cushioning layers should be placed between pipe layers within the wooden crate to prevent the bottom pipes from being crushed.
Reinforced Fumigation-Free Wooden Cases (Plywood Cases): Wooden cases are the only recommended packaging method for high-value alloy pipes. The base of the case must be reinforced to facilitate forklift handling.

FAQ

Q: Can you manufacture U-bend tubes?
A: Yes. Monel 400 has excellent ductility, making it ideal for U-bending. We perform bending in accordance with ASTM A556/B163 standards and apply the necessary stress-relief heat treatment to the bent sections.

Q: Why is Monel 400 significantly more expensive than stainless steel?
A: This is primarily due to its high nickel content (over 63%); nickel is a precious metal subject to significant price fluctuations in the global market. Additionally, Monel 400 is difficult to process, requiring specialized tooling and production equipment.

Q: What is the typical lead time for these tubes?
A: If round bar stock is available, the lead time is usually 45–60 days.
For extra-long tubes or special specifications, it may take 70–90 days.
Due to high raw material costs, the factory rarely keeps finished products in stock; production is generally carried out on a made-to-order basis. 

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