Incoloy 925 Seamless Tube

UNS N09925 | 2.4852 | Tube

Incoloy 925 Seamless Tube (N09925 / 2.4852) is a cold-drawn seamless tube produced to international standards, with chemistry and mechanical properties verified on every heat. Supplied from our Wenzhou mill with EN 10204 3.1 mill test certificate, PMI and dimensional inspection on request.

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Incoloy 925 Product Overview and Advantages

A SeamlessIncoloy 925Tube is a high-performance nickel-iron-chromium alloy tube (UNS N09925) designed for demanding industrial environments requiring exceptional strength and corrosion resistance.

Unlike welded tubing, seamlessIncoloy 925 tubing is produced through hot extrusion or precision cold drawing from solid billets, eliminating longitudinal weld seams. This seamless structure ensures uniform mechanical properties, superior structural integrity, and improved reliability under high pressure and corrosive conditions.

Incoloy Alloy 925 is an age-hardenable superalloy strengthened by controlled additions of molybdenum (Mo), copper (Cu), titanium (Ti), and aluminum (Al). Through precipitation hardening (age hardening), the alloy develops significantly enhanced tensile and yield strength while maintaining outstanding resistance to sulfide stress cracking (SSC) and stress corrosion cracking (SCC) in aggressive environments.

Because of these properties, Alloy 925 seamless tubes are widely used in oil & gas, chemical processing, marine engineering, and power generation systems.

Key Technical Advantages of Seamless Incoloy 925 Tubing

Selecting UNS N09925 seamless tubing offers several critical advantages for high-reliability industrial applications:

Superior Corrosion Resistance

Seamless Incoloy 925 exhibits exceptional resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking, especially in sour gas environments containing hydrogen sulfide (H₂S) and high-chloride media.

High Mechanical Strength

Through age-hardening heat treatment, Alloy 925 achieves yield strengths nearly twice that of conventional austenitic stainless steels such as 316L, while maintaining good ductility.

Excellent Thermal Stability

The alloy maintains high fracture toughness and structural stability across a wide temperature range, from cryogenic conditions to elevated operating temperatures encountered in process industries.

High-Pressure Performance

The seamless production process eliminates weld seams, reducing the risk of longitudinal failure and enabling higher pressure ratings in subsea and downhole equipment.

Reduced Life-Cycle Cost

Due to its long service life, corrosion resistance, and mechanical durability, Incoloy 925 tubing reduces maintenance frequency, system downtime, and total cost of ownership (TCO).

Product Specifications and Data of Seamless Incoloy 925 Tube

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Incoloy 925.

The composition of Incoloy 925 is carefully balanced to achieve its superior corrosion resistance and high strength.

Chemical Composition of Incoloy 925

Grade	UNS	C	Mn	P	S	Si	Ni	Cr	Mo	Cu	Fe	Ti	Al	Others
Incoloy 825	N08825	≤0.05	≤1.0	≤0.030	≤0.030	≤0.5	38.0-46.0	19.5-23.5	2.5-3.5	1.5-3.0	Bal ≥22.0	0.6-1.2	≤0.2	···
Incoloy 925	N09925	≤0.03	≤1.0	≤0.030	≤0.030	≤0.5	42.0-46.0	19.5-23.5	2.5-3.5	1.5-3.0	Bal ≥22.0	1.9-2.4	0.1-0.5	Nb: ≤0.05

Incoloy 925 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.

Typical Mechanical Properties of Incoloy 925

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 965 MPa	≥ 758 MPa	≥ 25%	30 - 35 HRC

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Typical Physical Properties of Incoloy 925

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
8.14 g/cm³	1340 - 1400 °C approx.	13.9 µm/m·°C (20-100°C)	11.1 W/m·K (20°C)	195 GPa	1.15 x 10⁻⁶ Ω·m (20°C)

Table 4: The Standard of Seamless Nickel Alloy Tube or Pipe ASTM B829 Size Tolerance Chart (mm):

The Standard of Seamless Nickel Alloy Tube or Pipe ASTM B829 Size Tolerance Chart (mm)

STANDARD	OD[D]	TOLERANCE	THICKNESS[S]	TOLERANCE	LENGTH	TOLERANCE
ASTM B829 (Seamless Cold-Worked Tube and Pipe)	10＜d＜16	±0.13	S(ave): ±15%	S(Min):+30%/0	D＜50.8	+3.2/0
	16≤D≤38	±0.19	S(ave): ±10%	S(Min):+22%/0
	38＜d≤76	±0.25
	76＜d≤114	±0.38			50.8≤D	+4.8/0
	114＜d≤154	±0.51	S(ave): ±12.5%	S(Min):+28%/0
	152＜d≤168	±0.64
	168＜d≤219	±0.79
	219＜d≤356	+1.57/-0.79	S(ave): +15%/-12.5%	S(Min):+30%/0
	356＜d≤610	+3.18/-0.79	S(ave): +15%/-12.5%	S(Min):+30%/0
ASTM B829 (Hot-Finished Tube)	19≤D≤38	+0.4/-0.8	S(ave): ±12.5%	S(Min):+28.5%/0	D＜50.8	+3.2/0
	38＜d≤102	+0.8/-0.8			50.8≤D	+4.8/0
	102＜d≤235	+1.6/-0.8			50.8≤D	+4.8/0
ASTM B829 (Seamless Hot-Worked Pipe)	25≤D≤48	+0.4/-0.79	S(ave): +16%/-12.5%	S(Min):+28.5%/0	D＜50.8	+3.2/0
	48＜d≤114	±0.79			D＜50.8	+3.2/0
	114＜d≤165	±1.2			50.8≤D	+4.8/0
	165＜d≤235	±1.6			50.8≤D	+4.8/0

Typical Applications of Alloy 925 Seamless Tubes

Thanks to its robust metallurgical properties, Seamless Incoloy Alloy 925 Tubing is widely used in critical industries:

Item	Details
Oil & Gas Industry	Downhole completion equipment Tool joints and wellhead components Production tubing and hangers Sour gas service valves and fittings

Item	Details
Chemical & Petrochemical Processing	Corrosion-resistant piping systems Heat exchanger tubing High-pressure reactor components Acidic or chloride-containing fluid handling systems
Marine & Offshore Engineering	High-strength marine fasteners Propeller shafts and subsea hardware Offshore platform structural components
Power Generation	High-performance heat transfer tubing Superheater and boiler components Corrosion-resistant piping in power plants

Incoloy 925 Quality Assurance and International Compliance

To ensure consistent performance and full traceability, all Seamless Incoloy 925 Tubes are supplied with comprehensive quality documentation and testing reports.

Certification	Description
Material Test Certificates	Fully compliant with EN 10204 3.1 / 3.2 certification
Material Verification	100% PMI (Positive Material Identification) and raw material traceability
Testing Reports	Third-party inspection (TPI), ultrasonic testing (UT), and hydrostatic pressure testing
Compliance Documentation	Heat treatment charts, dimensional inspection, and surface roughness (Ra) reports
Laboratory Validation	Testing conducted by government-approved laboratories with full NDT reports

Frequently Asked Questions About Incoloy 925 Seamless Tubes

What is Incoloy 925 Seamless Tube?

A Seamless Incoloy 925 Tube is a high-performance nickel-iron-chromium alloy tube (UNS N09925) designed for demanding industrial environments requiring exceptional strength and corrosion resistance.

Which standards does Incoloy 925 Seamless Tube comply with?

Incoloy 925 Seamless Tube is produced to ASTM B829.

Request a Incoloy 925 Tube Quotation

Send us your specification for Seamless Incoloy 9 seamless tube — OD, wall thickness, standard and quantity — and our engineering team will reply with a quotation within 24 hours.