ASTM B622 Seamless Hastelloy C276 Pipe

1. Standard: ASTM B622, ASTM B619, ASTM B474
2. OD: 1/8″NB – 24″NB
3. Thickness: SCH5~SCHXXS
4. End: Beveled End, Plain End

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Product Introduction

Hastelloy C276 (UNS N10276) serves as the ultimate insurance policy against catastrophic corrosion. While standard stainless steels succumb to pitting and stress cracking, C276 thrives in the most aggressive chemical environments-from boiling mineral acids to sour gas wells. HT PIPE is a astm b622 uns n10276 seamless pipe supplier with 15+ export experience. Contact us for more information and quotes for free!

We offers ASTM B622 Seamless Hastelloy C276 in a variety of forms, including:

Bar
Wire
Sheet
Plate
Forgings
Pipe fittings
Flanges
Seamless & Welded pipe
Seamless Tube & Welded tube
Weld Rod

Alloy C276 Tubing Specification

Specification	ASTM B622, ASME SB622
Seamless Tube Size	1 / 2" NB - 16" NB
Welded Tube Size	1 / 2" NB - 24" NB
Schedule	SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Form	Round, Hydraulic Etc
Type	Seamless / ERW / Welded / Fabricated / LSAW Pipes
Length	Single Random, Double Random & Cut Length.
End	Plain End, Beveled End, Threaded
Delivery Condition	Annealed and Pickled, Polished, Bright Annealed, Cold Drawn
Value Added Services	Cutting, Beveling, Polishing, Threading, Destructive, Non Destructive, Ultrasonic Testing

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Core Chemistry: More Than Just "High Nickel"

Many procurement managers mistake C276 for just another expensive nickel alloy. Its true power lies in the synergistic effect of Molybdenum (15-17%) and Tungsten (3-4.5%).

The Bane of Reducing Media: Unlike 316 stainless steel, C276 remains exceptionally stable in hot, contaminated mineral acids, such as formic and acetic acids containing chlorides.
The Low-Carbon Shield: With a carbon content limited to ≤ 0.010%, C276 minimizes grain-boundary carbide precipitation in the heat-affected zone (HAZ) during welding. This means the pipes can typically be put into service "as-welded" without the need for complex post-weld solution annealing.

Real-World Performance

In the high-humidity saline environments or specific Flue Gas Desulfurization (FGD) systems, standard alloys succumb rapidly to localized pitting.

Pitting Resistance Equivalent Number (PREN): C276 typically boasts a PREN exceeding 60, significantly higher than the 35-45 range of most Super Duplex steels.
Stress Corrosion Cracking (SCC): In sour oil and gas fields containing H2S, C276 piping meets NACE MR0175 standards, making it one of the few reliable choices for downhole production tubing.

Seamless vs. Welded C276

ASTM B622 Seamless Pipe: The gold standard for high-pressure, lethal fluid service. Its monolithic structure eliminates the risk of galvanic corrosion at the weld seam.

ASTM B619/B626 Welded Pipe: With modern Plasma Arc Welding (PAW) and cold-drawing techniques, high-quality welded tubing offers a cost-effective alternative for large-diameter atmospheric transfer systems.