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Shanghai COCESS Special Alloys Co., Ltd. stocks and supplies Incoloy 925 (UNS N09925) Seamless Pipe and Tube for sour oil & gas, subsea, and aggressive chemical processing services. Our nickel-iron-chromium seamless tubing is produced to ASTM B423 / ASME SB423 and ASTM B163 / ASME SB163, available in solution-annealed or solution-annealed-plus-aged (precipitation hardened) condition. All shipments include Mill Test Certificate (EN 10204 3.1, 3.2 on request), PMI verification, and full heat traceability to meet NACE MR0175 / ISO 15156 sour-service project requirements.
Alloy 925 Seamless Pipe & Tube – Sour Service Capability
Incoloy 925 is an age-hardenable nickel-iron-chromium alloy (Ni 42–46%, Cr 19.5–22.5%) with additions of Mo, Cu, Ti (1.9–2.4%), and Al (0.10–0.50%). The Ti+Al enables γ′-Ni₃(Al,Ti) precipitation hardening, providing yield strength ≥758 MPa (110 ksi) while retaining the excellent resistance to H₂S-induced sulfide stress corrosion cracking (SSC), pitting, and crevice corrosion characteristic of Alloy 825. It is qualified per NACE MR0175 / ISO 15156 for sour (H₂S-containing) environments and is widely specified for downhole tubulars, flowlines, and high-pressure process piping in sour gas fields.
Typical applications:
Oil & Gas (Upstream / Midstream): downhole production tubing, completion strings, surface flowlines in sour gas wells, sour-gas gathering manifolds, wellhead jumper lines
Subsea & Offshore: control-line tubing, subsea flowline jumpers, seawater lift system piping (chloride-resistant)
Chemical Processing: sulfuric / phosphoric acid handling lines, acid regeneration plant piping, heat exchanger tubes in mixed acid + chloride media
Available Seamless Pipe & Tube Dimensions
|
Product Form |
Size / Dimension Range |
Applicable Standard |
|---|---|---|
|
Seamless Pipe (Process / Pressure Piping) |
OD 1/2"–8" (21.34–219.1 mm), WT SCH 5S–XXS (0.89–12.7 mm) |
ASTM B983 / ASME SB983, ANSI/ASME B36.19 |
|
Seamless Tube (Heat Exchanger / Instrument / Downhole) |
OD 6–114 mm (1/4"–4"), WT 0.5–8 mm, cold drawn available |
ASTM B163 / ASME SB163 |
|
Small OD Precision Tube / Capillary |
OD 3–25 mm, WT 0.4–3 mm, bright annealed or aged |
ASTM B829 reference (Ni-alloy general) |
|
Large OD Seamless (on request) |
Up to OD 273 mm, custom WT |
Per customer drawing / inquiry |
Lengths: random (5–7 m), double random (10–13 m), or cut-to-length ±3 mm tolerance
End prep: plain end (PE), beveled end (BE per ASME B16.25 — 30° + 1.5 mm land), or threaded (NPT / API if specified)
Surface: pickled & passivated, bright annealed (BA), or mill finish; aged condition available for high-strength service
Chemical Composition — ASTM B805 / B983 (wt%)
|
Element |
Ni |
Cr |
Fe |
Mo |
Cu |
Ti |
Al |
C (max) |
Mn (max) |
Si (max) |
S (max) |
P (max) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Content (%) |
42.0–46.0 |
19.5–22.5 |
Bal. |
2.5–3.5 |
1.5–3.0 |
1.9–2.4 |
0.10–0.50 |
0.03 |
1.00 |
0.50 |
0.03 |
0.03 |
Mechanical Properties — Room Temperature
|
Condition |
Tensile Strength σb |
0.2% Yield Strength σ₀.₂ |
Elongation (in 4D) |
Hardness |
|---|---|---|---|---|
|
Solution Annealed |
≥ 685 MPa (99 ksi) |
≥ 270 MPa (39 ksi) |
≥ 30% |
≤ HRB 95 |
|
Solution Annealed + Aged* |
≥ 965 MPa (140 ksi) |
≥ 758 MPa (110 ksi) |
≥ 18–20% |
HRC 26–35 (NACE cap ≤ HRC 35) |
*Typical aging: 730–750°C soak + controlled cooling. Aged-condition pipe/tube is 100% hardness-inspected to confirm HRC ≤ 35 for sour-service acceptance per NACE MR0175 Table A.10.
Density: 8.08 g/cm³ (0.292 lb/in³)
Melting Range: 1311–1366°C (2392–2490°F)
Recommended Service Temp.: −196°C to 350°C continuous (short-term to ~650°C in low-corrosion atmospheres)
Non-magnetic (permeability ~1.001)
Testing & Quality Documentation
Mill Test Certificate: EN 10204 3.1 as standard; 3.2 with TPI (SGS / BV / TÜV / DNV) available
PMI: 100% Positive Material Identification on each heat lot before dispatch
NDE Options: Hydrostatic test (per ASTM A999 / ASME B36.19), Eddy Current Test (ECT per ASTM E426 for tubing), UT on heavy-wall pipe
Hardness Check: batch hardness mapping for age-hardened material to document NACE MR0175 compliance
Full heat-number traceability from mother billet through finished pipe/tube
Why Source Incoloy 925 Pipe & Tube from Shanghai COCESS
Project-Ready Stock: common OD/WT in annealed and aged condition held in Shanghai warehouse for quick release
NACE Compliance: documented hardness control (≤ HRC 35) and MTC stamping for sour-service projects
Custom Service: cut-to-length, beveled ends, custom OD/WT outside standard range, small-lot trial orders supported
Export Packing: sealed anti-rust wrap, wooden crates / bundles with end caps, export-grade documentation
One-Stop Nickel Alloys: Incoloy 800H/825/926, Monel 400, Hastelloy C-276/C-22 pipe & tube available from same source
Need a quote on Incoloy 925 seamless pipe SCH 40S / SCH 80S, B163 heat exchanger tubes, or sour-service NACE-compliant aged tubing?
Contact Shanghai COCESS Special Alloys Co., Ltd. for inventory check, MTC sample, and competitive export pricing.
???? Email: sales@cocessalloys.com
