- ASTM B446 Inconel 625 Rod, 2-16" Diameter, Oil Drilling W.Nr.
2.4856 Nickel Alloy
Products Specification
Standard | AISI, ASTM, BS, DIN, GB, JIS |
Grade | Monel series: 400 K500 Inconel series: 600 601 625 718 725 Incoloy series: 800 800H 825 925 Hastelloy series: B,B2,B3,C,C-276,C-4,C-22 Pure: Ni200, Ni201 |
Specifications | Round bar | Diameter:4~300mm |
Flat bar | Thickness | 1.0~100mm |
Width | 1~1500mm |
Square bar | Size: 4*4-100*100mm |
Length | 2m, 5.8m, 6m, or as required. |
Surface | Black, peeled, polishing, bright, sand blast, hair line, etc. |
Price Term | Ex-work, FOB, CFR, CIF, etc. |
Delivery Time | Standard size is in stock,prompt delivery or as order's quantity. |
For oil and gas drilling operations operating in extreme downhole
environments—where corrosive brines, high temperatures up to 1093°C
(2000°F), and extreme pressure test equipment durability—ASTM B446
Inconel 625 round rod (W.Nr. 2.4856, UNS N06625) stands as an
uncompromising material solution. Available in 2-16" diameters,
this nickel-chromium-molybdenum-niobium superalloy delivers the
strength, corrosion resistance, and structural integrity required
for critical drilling components, from downhole tools to wellhead
equipment.
At the core of its performance is a meticulously engineered
chemical composition that defines its superalloy properties.
Composed of a minimum 58% nickel matrix—providing inherent
resistance to chloride stress corrosion cracking—this alloy
incorporates 20.0-23.0% chromium for oxidation resistance,
8.0-10.0% molybdenum for defense against reductive corrosion, and
3.15-4.15% niobium (including tantalum) for solid-solution
strengthening . Trace elements are tightly controlled: carbon
(≤0.10%), silicon (≤0.50%), phosphorus (≤0.015%), and sulfur
(≤0.015%) to avoid grain boundary degradation and maintain
weldability . This precise formulation eliminates the need for
post-fabrication heat treatment while delivering exceptional
mechanical performance.
The mechanical properties of this Inconel 625 rod are tailored to
meet oil drilling’s rigorous demands. In the annealed
condition—standard for most drilling applications—it achieves a
minimum tensile strength of 760 MPa (110 ksi) and yield strength of
345 MPa (50 ksi), with elongation exceeding 30% for enhanced
ductility during component forming . For high-stress applications
like drill collars or heavy-duty valves, cold-worked variants push
tensile strength to 1924 MPa (279 ksi) while retaining critical
toughness . Notably, these properties remain consistent across
temperature extremes, from cryogenic conditions to the searing heat
of deepwell environments, ensuring reliable performance where
conventional alloys fail.
Corrosion resistance is the alloy’s defining advantage for oil
drilling. It excels in the most aggressive downhole chemistries:
resisting pitting and crevice corrosion in chloride-rich brines,
withstanding inorganic acids (including sulfuric and hydrochloric
acids common in acidizing treatments), and enduring both oxidizing
and reducing environments . Unlike carbon steels or even lesser
nickel alloys, Inconel 625 (W.Nr. 2.4856) avoids stress corrosion
cracking in sour gas wells, complying with NACE MR 0175 (ISO
15156-3) standards for hydrogen sulfide service . In seawater
injection systems and offshore drilling platforms, it demonstrates
near-immunity to marine corrosion, outperforming stainless steels
by orders of magnitude .
Manufactured to ASTM B446 (and ASME SB446 for pressure-containing
components), our Inconel 625 rods adhere to strict dimensional
tolerances and quality controls. The 2-16" diameter range covers
the most common sizes for drilling applications: 2-4" rods for
precision downhole sensors, 6-10" for valve stems and actuator
components, and 12-16" for heavy-duty drill string accessories .
Each rod undergoes annealing at 1095°C (2000°F) followed by rapid
cooling to optimize grain structure and corrosion resistance, with
surface finishes available from mill scale to precision ground for
tight-fit assemblies.
In oil drilling operations, this material translates to tangible
value: extended service life for components exposed to abrasive
drilling fluids, reduced downtime from corrosion-related failures,
and compliance with strict industry safety standards. Typical
applications include:
- Downhole tool mandrels and stabilizers
- Wellhead valve trim and choke components
- Subsea pipeline connectors and fasteners
- Acidizing equipment and pressure vessels
- Offshore platform structural supports
Beyond performance, our Inconel 625 rods support operational
efficiency. Their excellent weldability—even without preheating or
post-weld heat treatment—simplifies on-site modifications, while
their non-magnetic properties make them ideal for use near logging
tools . Each shipment includes full mill certification with
chemical analysis, mechanical test results, and traceability
documentation, ensuring compliance with API and ISO requirements.
Choosing the right alloy for drilling applications means balancing
performance and practicality—and ASTM B446 Inconel 625 rod delivers
on both fronts. Its unique combination of strength, corrosion
resistance, and fabricability makes it the material of choice for
operators who refuse to compromise on reliability in extreme
environments. Whether for onshore shale wells, deepwater
exploration, or sour gas production, our 2-16" diameter W.Nr.
2.4856 nickel alloy rods provide the durability needed to keep
drilling operations running safely and efficiently.




