Inconel 625 Inconel 718 High Strength Nickel‑Base Super Alloy Seamless Pipe

Inconel 625 Inconel 718 High Strength Nickel‑Base Super Alloy Seamless Pipe | UNS N06625 UNS N07718 Alloy Tube

Ultra‑high tensile & creep rupture strength under high‑temperature service environment
Outstanding resistance to pitting, crevice corrosion and seawater medium erosion
Inconel718 achieves obvious strength promotion by precipitation hardening heat treatment
Stable performance under alternating thermal cycle condition
Adapt for aerospace, offshore oil‑gas and high‑pressure process piping system

Product Overview

Inconel 625 (UNS N06625) and Inconel718 (UNS N07718) are precipitation‑strengthened nickel‑base super alloy seamless pipes. Inconel 625 relies on molybdenum and niobium element to gain high strength without precipitation hardening treatment, owning excellent corrosion resistance in brine, acid and marine environment. Inconel718 is precipitation hardening alloy, obtaining extremely high mechanical property via ageing heat treatment, fit for high‑load high‑temperature components.

Our Inconel 625 / 718 seamless super alloy pipes adopt vacuum melting raw material, hot extrusion + multi‑pass cold drawing process, solution annealing / age hardening heat treatment as per requirement. All products pass strict UT, ET non‑destructive inspection. Widely used for offshore oil & gas extraction piping, aerospace engine auxiliary tube, chemical high‑pressure reactor piping, seawater desalination equipment, power‑generation gas turbine accessory parts. We support custom outer diameter, wall thickness and fixed‑length cutting according to project drawing.

Nickel/Super Alloy Pipe

Chemical & Mechanical Property Snapshot

Grade	UNS No.	Ni(%)	Cr(%)	Mo(%)	Nb+Ta(%)	Yield Rp0.2 MPa Min	Tensile Rm MPa Min	Elongation A (%) Min
Inconel 625	N06625	58 Min	20‑23	8‑10	3.15‑4.15	410	830	30
Inconel 718	N07718	50‑55	17‑21	2.8‑3.3	4.75‑5.50	825	1240	12

Detailed Technical Specifications

Item	Specification Details
Material Grade	Inconel 625, Inconel 718
UNS Code	UNS N06625, UNS N07718
Applicable Standards	ASTM B444, ASTM B829, ASME SB‑444, AMS 5589, NACE MR0175
Pipe Manufacturing Type	Hot extruded seamless, Cold‑drawn seamless
Outer Diameter Range	8mm‑219mm; Custom special OD upon drawing
Wall Thickness Range	1.2mm‑22mm; heavy‑wall & thin‑wall available
Dimension Tolerance	OD: ±0.5 %‑±1 %; WT: ±7.5 % comply with ASTM B444
Available Length	Random mill length:3‑8m; Fixed cut length:1‑12m; Custom saw‑cut service
Delivery Condition	Inconel625:Solution Annealed & Pickled; Inconel718: Solution‑annealed / Age‑hardened optional
Surface Options	Pickled matte annealed, Bright annealed, Fine mechanical polishing
Pipe End Treatment	Plain end, Beveled end, Deburred end; Plastic end cap protection
Non‑Destructive Testing	Full‑body Ultrasonic Test(UT), Eddy‑Current Test(ET), Hydrostatic Test; PMI positive material identification
Destructive Lab Test	Chemical composition analysis, Tensile test, Hardness test, Flattening test, Flaring test
MOQ (Minimum Order Quantity)	5 Tons; small trial order negotiable subject to stock
Lead Time	Stock items:10‑18 working days; Custom production:40‑55 working days
Payment Term	T/T, Irrevocable L/C at sight
Packaging Details	Inner waterproof kraft paper; each pipe end fitted with plastic protective cap; bundled by steel strips; loaded into fumigated wooden pallet / solid wooden crate for ocean freight; anti‑moisture desiccant inside package
Trade Term	FOB, CFR, CIF, DAP, DDU
Document & Certificate	Mill Test Certificate MTC EN 10204 3.1; Third‑party inspection SGS/BV/LR available upon buyer request
Additional Service	Custom cutting, polishing, surface treatment, bundling mark, OEM label

Shape Options

Shape Type	Description & Typical Application
Round	Standard seamless round tube, widely used for fluid pipelines, boilers, hydraulic systems, and general structural projects
Square	Equal-side hollow square section, suitable for building frames, machinery supports, and heavy-load structural components
Rectangular	Unequal-side rectangular hollow section, ideal for beams, brackets, and vehicle chassis structural parts
Hexagonal	Hexagonal cross-section, suitable for drive shafts, mechanical fittings, and direct assembly without additional machining
Oval / Flat Oval	Oval hollow profile, used for automotive parts, agricultural machinery, and special frame structures
Special Custom Shaped	D-shaped, triangular, splined inner bore, lemon-shaped, and other non-standard profiles; custom production available according to customer drawings and samples

Dual‑unit Dimension Reference T

Outer Diameter (mm)	Outer Diameter (inch)	Wall Thickness (mm)	Wall Thickness (inch)
6	0.236″	0.8–2.0	0.031″–0.079″
12.7	0.50″	1.0–3.0	0.039″–0.118″
21.3	0.84″	1.5–4.0	0.059″–0.157″
33.7	1.33″	2.0–6.0	0.079″–0.236″
42.4	1.67″	2.0–8.0	0.079″–0.315″
60.3	2.37″	2.5–10	0.098″–0.394″
88.9	3.50″	3.0–12	0.118″–0.472″
114.3	4.50″	3.0–16	0.118″–0.630″
168.3	6.63″	4.0–20	0.157″–0.787″
219.1	8.63″	5.0–25	0.197″–0.984″
273	10.75″	6.0–30	0.236″–1.181″
323.9	12.75″	8.0–35	0.315″–1.378″
406.4	16.00″	10–40	0.394″–1.575″

Product Comparison Table

Grade	UNS	Main Alloy Feature	Service Condition	Typical Application	W.Nr Equivalent
Inconel 625	N06625	Ni‑Cr‑Mo‑Nb, solid‑solution strengthened	Corrosive medium, high pressure	Off‑shore, desalination	2.4856
Inconel718	N07718	Precipitation hardening nickel alloy	High‑temp high‑load	Aerospace, gas turbine	2.4668
Inconel 601	N06601	Ni‑Cr‑Fe‑Al anti‑oxidation	Furnace high‑temp atmosphere	Heat‑treatment equipment	2.4851

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Sulfur-Containing Oil and Gas Corrosive Downhole Tubing String

Aerospace Hydraulic Piping System

High-Pressure Piping for Seawater Desalination

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What heat treatment difference between Inconel625 and Inconel718 pipe?

Inconel625 uses solution annealing only; Inconel718 needs solution plus ageing precipitation hardening for maximum strength.

Can Inconel718 seamless pipe be supplied in age‑hardened condition?

Yes, we can deliver in solution annealed or age‑hardened status according to customer technical requirement.

What is the main application scenario for Inconel 625 alloy pipe?

Off‑shore oil‑gas platform piping, seawater cooling system, chemical anti‑corrosion high‑pressure pipeline.

Do you accept custom non‑standard wall thickness for super alloy pipe?

Yes, non‑standard OD & wall thickness can be produced based on customer drawings, lead time will be extended.

How about weld performance for Inconel 718 pipe?

It can be welded, post‑weld heat treatment is generally recommended to achieve designed mechanical performance.

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