Inconel N07718 Steel Pipe

1. Standard: ASTM B163, ASME SB163
2. Size: 1/2''~12'' OD
3. Thickness: SCH5~SCHXXS
4. Equivalent: UNS N07718, WNR.2.4668, Inconel 718

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Product Introduction

HT PIPE is a 2.4668 inconel 718 pipe supplier with 15+ export experience. Contact us for more information and quotes for free!

Among high-performance superalloys, Inconel 718 (designated as UNS N07718 and Werkstoff Number 2.4668) represents a pinnacle of metallurgy. Originally developed to meet the strict demands of aerospace propulsion, this precipitation-hardenable nickel-chromium alloy has become a cornerstone material for deepwater oil extraction, nuclear generation, and heavy chemical processing.

Product Forms

Bar & Rod

Plate & Sheet

Coil & Strip

Pipe & Tube

Fitting: Flange, Tee, Elbow, Reducer etc.

Forging: Ring, Shaft, Circle, Block etc.

Why Inconel 718 Defies Extreme Stress

Element	Weight Percentage (%)
Nickel (Ni) + Cobalt (Co)	50.00 – 55.00
Chromium (Cr)	17.00 – 21.00
Niobium (Nb) + Tantalum (Ta)	4.75 – 5.50
Molybdenum (Mo)	2.80 – 3.30
Titanium (Ti)	0.65 – 1.15
Aluminum (Al)	0.20 – 0.80
Iron (Fe)	Balance (Approx. 17%)

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Seamless vs. Welded Inconel 718 Pipes

Seamless Inconel 718 Pipes

Manufactured through hot extrusion or rotary piercing of a solid alloy billet, seamless pipes possess a completely homogeneous microstructure.

Performance Attributes: Because there is no longitudinal seam, seamless variants eliminate the risk of a localized heat-affected zone (HAZ). They are rated for maximum internal working pressures and are preferred for high-vibration aerospace conduits and downhole oil tools.
Dimensional Characteristics: Typically restricted to smaller and medium outer diameters (OD) due to the mechanical constraints of the extrusion process.

Welded Inconel 718 Pipes

Produced by precision rolling flat-rolled strip or plate and executing a continuous longitudinal weld utilizing gas tungsten arc welding (GTAW) or plasma arc welding (PAW).

Performance Attributes: Historically avoided in superalloys due to spontaneous strain-age cracking during post-weld thermal treatment. However, modern metallurgy allows Inconel 718 to exhibit outstanding weldability. The sluggish precipitation response of the $\gamma''$ phase enables welding without immediate hardening, minimizing the threat of cracking.
Dimensional Characteristics: Welded pipes allow for significantly larger nominal pipe sizes (NPS) and more uniform wall thickness tolerances over long production runs. In critical installations, a weld efficiency factor (typically 0.85) is applied unless 100% radiographic inspection validates full joint integrity.

ASTM and ASME Dimensions

ASTM B637 / ASME SB637: Though heavily focused on precipitation-hardening nickel alloy bars and forgings, this standard dictates the baseline mechanical testing and chemical limits utilized for pipe raw materials.

ASTM B670: Standard specification for precipitation-hardening nickel alloy plate, sheet, and strip-the critical input material for producing welded pipes.

ASME B16.5 & ASME B36.19M: Govern the structural dimensions, schedules (such as Schedule 10S, 40S, or 80S), and pressure ratings for nickel alloy piping systems.