Incoloy 925 Seamless Pipe

UNS N09925 | 2.4852 | ASTM B983 | Xinzhe

For oilfield tubular systems that must combine strength with corrosion resistance, Alloy 925 (UNS N09925) offers a precipitation-hardenable nickel-iron-chromium answer whose alloy design delivers strength after suitable aging alongside corrosion performance in selected oil and gas environments. The specified heat-treatment condition is central to the mechanical properties and to qualification for the intended service, so a purchase description should state whether the material will be supplied in the final aged condition or undergo further fabrication and heat treatment. The Incoloy 925 seamless pipe is a candidate for strength-critical oilfield tubulars and selected corrosive process lines. For sour service, assess the exact material condition against your project's environmental and qualification limits, and confirm the applicable seamless pipe specification and acceptance criteria before finalizing the order. The seamless construction provides a continuous wall along each length. Please specify outside diameter and wall thickness or nominal pipe size and schedule, together with length, end preparation and EN 10204 3.1 documentation needs.

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At a glance — Incoloy 925 Pipe

Specification	ASTM B983 — the edition cited on the PO governs
Ordering basis	NPS × schedule, or OD × wall — stated on the order
Sourcing range	OD 6 – 457 mm · wall 0.5 – 45 mm · length ≤ 18 m; each standard × OD × wall × length × condition confirmed in writing
Condition	Solution annealed; pickled & passivated, bright annealed or polished
Documents	EN 10204 3.1 MTC as standard (3.2 on request); hydrostatic or NDT electric test on every length

Sourcing capability, not a stock list — availability, MOQ and lead time are stated in the written quotation.

On this page

01Sizes 02Standards 03Chemistry 04Properties 05Dimensions 06Testing & MTC 07Applications 08Selection 09FAQ 10Related

Sizes, Wall Basis and Ordering

Two figures are kept apart here: the overall sourcing range — what we can supply ex-stock or source mill-direct — and the confirmed combination for your order (standard × size × wall × length × condition). The tables state the first; the written quotation fixes the second.

Supply combinations by size band

Size band, mm (NPS)	Wall range, mm	Supply route (ex-stock / mill-direct)	Order status
≤ 25	2.0 – 5.0	Ex-stock · standard walls	In stock · 3–7 days
> 25 – 114.3	2.5 – 12.0	Ex-stock; mill-direct above 6 mm wall	In stock / mill-direct
> 114.3 – 323.9	3.5 – 30.0	Mill-direct	Mill-direct · 25–35 days
> 323.9 – 457	6.0 – 50.0	Mill-direct	Mill-direct · 25–35 days

Stock items are marked In stock; everything else is mill-direct with a stated lead time. Schedule coverage follows the wall range shown for each band; non-standard walls are quoted individually. Above NPS 24 the tabulated dimensional bands no longer apply and the basis is agreed in writing.

Ordering options

Item	What can be ordered
Size	NPS and schedule, or actual OD × wall thickness
Outside diameter	6 – 457 mm — to the ordered OD or to the NPS dimension
Wall thickness	0.5 – 45 mm — schedule wall or specified wall, stated on the order
Length	Random 5.8–7 m (single or double random), fixed up to 18 m
Ends	Plain, bevelled, or threaded with couplings
Surface	Pickled and passivated, or shot-blasted
Delivery condition	Solution annealed; hydrostatic or NDT route per specification

Sizes at the edge of a band are quoted after technical review. If your enquiry is written in NPS and schedule, the quotation restates it as OD × wall so our desk and your buying team are working from the same numbers.

Ordering Standards: B983 vs B163

Nickel alloys are not covered by A213 or A312. Each alloy carries its own B-series specification, and the mechanical values are set per alloy — so the specification and edition must be stated on the enquiry, not inferred from the grade name. B983 is the primary specification for this product; B163 is the companion specification that is sometimes cited instead.

Item	ASTM B983	ASTM B163
Scope	Primary B-series specification for this alloy in the ordered form	Companion specification; confirm which one the purchase order cites
Ordering basis	OD × wall × length for tube, NPS × schedule or OD × wall for pipe	Same dimensional notation, different acceptance clauses
Chemical limits	Per the alloy table of the primary specification	May differ; the order must name the standard and edition
Testing	Integrity test plus the mechanical tests the specification requires	Same intent, different sampling and frequency
Documents	EN 10204 3.1 with heat-number traceability	3.1 or 3.2 as ordered

B163 covers seamless tube for several nickel alloys; B161, B165, B167, B407, B423, B444 and B622 cover pipe and tube by alloy family. The certificate cites the standard named on the order — mixing them after the fact is not possible.

Chemical Composition (Incoloy 925 Heat-Analysis Limits)

Chemical composition, % by weight:

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	≥ 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	1.9–2.4	0.1–0.5	Nb: ≤ 0.50

Values are the heat-analysis limits of the specification named above. Product analysis on the finished tube or pipe may differ within the tolerances the standard permits, and the actual heat analysis is printed on the mill test certificate.

Mechanical Properties and Physical Data

Mechanical properties:

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

Typical physical properties:

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)

Tensile and yield values are specification minima at room temperature; hardness and grain size are reported when the purchase order asks for them. Design values at service temperature must be taken from the applicable code, not from this table.

Permissible Variations in Dimensions (B983)

Dimensional acceptance follows the tables of the B-series specification named above, with B829 as the general tolerances reference where the product standard is silent. The bands below are representative; the edition cited on the purchase order governs.

Outside diameter

Outside diameter, mm	Permissible variation
≤ 25	± 0.13 mm
> 25 – 50	± 0.20 mm
> 50 – 100	± 0.38 mm
> 100 – 200	± 0.76 mm
>200	± 0.5 % of OD

Variations apply to the individual measurement. For cold-drawn tube the ovality is included in the OD band, not added to it.

Wall thickness

Condition	Permissible variation
Cold-finished	± 10 % of ordered wall
Hot-finished	+ 22.5 % / − 0 % of ordered wall
Minimum wall ordered	No point below the ordered minimum

The wall basis must match the design calculation; nickel-alloy tube is normally ordered on a minimum basis.

Random lengths 5.8–7 m single random, 11–13 m double random, unless a fixed length is ordered. End squareness and bevel angle are inspected before packing.

Inspection, Testing and Mill Test Certificates

Three groups of evidence are separated here, because only the first is inside the base price. Anything in the second and third groups has to be written on the purchase order — it cannot be added after the mill test certificate has been issued.

Group	Content	How it is triggered
1 — Included	Chemical analysis, tensile test, flattening or bend test, hydrostatic or nondestructive electric test, dimensional check, EN 10204 3.1 certificate	Standard supply; no extra instruction needed
2 — Written on the PO	Ultrasonic or eddy-current testing to a stated acceptance level, PMI on each heat, intergranular corrosion test, grain size, hardness survey, 3.2 certificate	Must appear on the purchase order; priced per order
3 — Third party	TPI witness (SGS, BV, TÜV, Lloyd's), destructive sampling, third-party laboratory, packing inspection, pre-shipment photographs	Arranged per order; extends the lead time

The test route is not interchangeable after the fact: if the certificate has to show ultrasonic testing, say so on the enquiry, because a hydrostatic-only pipe cannot be re-certified as ultrasonically tested.

What the mill test certificate records

Heat number	The melt the item came from, traceable to the raw-material certificate
Grade and specification	Grade designation plus the standard and edition the order cites
Chemical analysis	Actual values for each element, not the range
Mechanical results	Tensile, yield, elongation and hardness as tested
Test route	Hydrostatic or nondestructive electric test, plus any agreed NDT with the method reference
Heat treatment	Solution-annealing temperature range and cooling method
Dimensions	Ordered OD, wall and length, with the measured values on request

Incoloy 925 Pipe Applications and Points to Confirm

Each application below names the duty the grade is normally chosen for, and what should be settled before the order is placed — the third column decides whether this grade is the right one:

Industry	Typical duty
Oil & gas	wellhead, manifold and topside duty
Petrochemical & refining	hydrocarbon and sour-service duty
Chemical processing	aggressive reaction and transfer duty
Marine & offshore	salt-laden marine duty
Water treatment	water and wastewater duty
Acid service	strong acid handling

Points to confirm before ordering

Medium, concentration and chloride content — the figures that decide whether this grade holds
Design temperature and pressure, including upset and cleaning cycles
Whether the joint is welded, and the post-weld condition required
Inspection and document scope: NDT level, PMI, third-party witness

Send the medium, concentration, temperature, pressure and chloride level, and we will confirm the grade — or propose the next one up if the margin is narrow.

Grade Selection: Incoloy 925 vs Incoloy 825

Property	Incoloy 925	Incoloy 825
PREN, typical	30	30
Molybdenum	2.50–3.50	2.50–3.50
Yield strength, min.	≥ 758 MPa	≥ 240 MPa
Service temperature	≈ 400 °C	≈ 540 °C
Choose when	The acid, alkali or temperature exceeds what stainless steels hold	Lower alloy content is enough for the duty

PREN is indicative only and is calculated from the composition ranges above — it is not an acceptance value. Where the duty sits between two grades, the deciding factors are usually chloride content, temperature and whether the joint is welded.

Frequently Asked Questions

What sizes can be supplied in Incoloy 925 pipe?

The overall sourcing range is OD 6 – 457 mm, wall 0.5 – 45 mm, length 18 m. The band table shows the wall range normally held or supplied for each OD band; the exact combination of standard, OD, wall, length and manufacturing condition is confirmed in the quotation. Sizes at the edge of a band are quoted after technical review.

Is this page a stock list?

In part. Stocked sizes are marked In stock and ship in 3–7 days; everything else is mill-direct with a 25–35 day lead time, confirmed per item in the quote.

Is Incoloy 925 pipe ordered by NPS or by outside diameter?

Either, but it must be clear. NPS with schedule is the usual purchase form for process piping; actual OD × wall is used when the line is dimensioned that way. The quotation restates the order in both notations so our desk and your buying team are working from the same numbers.

Which specification applies — B983 or B163?

ASTM B983 is the primary specification for this pipe and the one the page describes. ASTM B163 is the adjacent specification; whether it applies depends on the ordered form, the test regime and the design code. State the standard and edition on the enquiry and the certificate will cite the same one.

Which tests and documents are included?

Mandatory: one integrity test per length (hydrostatic or nondestructive electric), tensile test per lot, dimensional check and an EN 10204 3.1 mill test certificate. Optional and only when written on the order: ultrasonic or eddy-current testing to a stated level, PMI, intergranular corrosion test, grain size, third-party witness and 3.2 certification.

How does Incoloy 925 compare with Incoloy 825?

Incoloy 825 is the usual comparison grade. Incoloy 925 carries PREN of about 30 against 30 for Incoloy 825, with a minimum yield of 758 MPa. The change is normally made when the duty — chloride level, temperature or pressure — leaves Incoloy 825 without margin over the design life.

Request an Incoloy 925 Pipe Quotation

Send: specification and edition, OD or NPS, wall and wall basis, length, quantity, surface finish, inspection scope and documents, and destination port. The quotation will restate the confirmed size combination, delivery condition, documents included and lead time for Incoloy 925 Pipe.

Request an Incoloy 925 Pipe quotation

Related Product Forms and Grades

Other forms and neighbouring grades, each with its own specification — confirm the applicable standard on every order:

Incoloy 925 seamless tube — UNS N09925 · W-Nr 2.4852
Incoloy 825 seamless pipe — Incoloy 825 — the grade normally compared with Incoloy 925 on this duty
Contact the sales team — Sizes outside the range, non-standard lengths and third-party inspection

Technical data compiled from the ASTM/ASME specification tables cited above and from published mill data. Page reviewed by the Xinzhe technical team, 09–11-2026. All values must be confirmed against the edition current at the time of order and against the heat certificate.