N06625 Nickel Based Alloy Extruded Seamless Pipe

Equivalent to N06625 Nickel Based Alloy Extruded Seamless Pipe, the alloy is a solid-solution strengthened Ni-Cr-Mo-Nb material that achieves excellent mechanical performance without relying on precipitation hardening.

Its unique composition provides:

● Outstanding resistance to pitting and crevice corrosion
● Excellent chloride stress corrosion cracking resistance
● Stable mechanical properties from cryogenic temperatures up to 650°C
● Excellent weldability without post-weld aging treatment

With global recognition under standards including UNS N06625, W.Nr. 2.4856, GB NS336, and GOST ХН75МБТЮ, N06625 seamless pipe meets material requirements across major aerospace, naval, and industrial markets.

Key Advantages

N06625 obtains its corrosion resistance from a balanced nickel-chromium-molybdenum-niobium alloy system.

The typical composition includes:

● Chromium (Cr): Provides oxidation and oxidizing media resistance
● Molybdenum (Mo) 8–10%: Improves resistance against pitting and crevice corrosion
● Niobium (Nb): Stabilizes the alloy structure and reduces sensitization risk during welding

Compared with conventional stainless steel grades such as 316, N06625 provides significantly improved corrosion resistance in chloride-containing environments, making it suitable for seawater, chemical, and defense applications.

Alloy Identity

The molybdenum (8–10%) and niobium (3.15–4.15%) combination is what distinguishes 625 from any stainless steel grade. Molybdenum raises the critical pitting temperature well above 316's limit; niobium forms stable carbides that prevent chromium depletion at grain boundaries, eliminating sensitization risk during thermal cycling. The result is an alloy you can weld and put directly into service — no post-weld heat treatment, no intergranular corrosion concern.

Extrusion Advantage

Hot extrusion presses a heated billet through a die in one continuous pass, forming the pipe in a single stroke rather than multiple deformation stages. Unlike pierce-and-roll methods that can introduce ovality or wall eccentricity, extrusion produces a homogeneous, weld-free hollow with dense grain flow aligned along the tube axis. Material yield exceeds 95% with the as-extruded surface clean enough to skip heavy finishing — reducing both lead time and cost per meter for N06625 nickel based alloy extruded seamless pipe procurement.

Specifications

FAQ

Q1: What are the equivalent grades for N06625 in different countries?

A: UNS N06625 (USA), W.Nr. 2.4856 (Germany/EU), Inconel 625 (trademark), ХН75МБТЮ (Russia/GOST), NS336 (China/GB). All refer to the same Ni-Cr-Mo-Nb composition. When you specify N06625 nickel based alloy extruded seamless pipe, you order to an internationally recognized standard.

Q2: Why hot extrusion instead of pierce-and-roll?

A: Extrusion forms the pipe in one pass — no weld, uniform wall. Pierce-and-roll involves multiple stages that can introduce ovality and surface defects. For a high-value alloy like 625, extrusion's ≥95% yield and clean surface save material cost and finishing work.

Q3: Do you supply rough pipe or finished pipe?

A: Both. Standard rough pipe is OD 89 mm × WT 9 mm, length to 3,500 mm — ideal as stock for your own cold drawing or machining. We also supply finished pipe in smaller processed dimensions with pickling, cold rolling, and annealing.

Q4: What military applications use N06625 pipe?

A: Naval seawater piping and heat exchangers, submarine components, aircraft engine ducting, missile and launch system hardware, defense chemical processing. Chloride SCC immunity and weldability without post-weld heat treatment make it a default choice.

Q5: Are you a manufacturer or trading company?

A: A China manufacturer. Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. operates our own hot extrusion line — we don't outsource. ISO 9001 certified, plus four additional industry certifications. Factory visits and third-party inspection welcome.