HC-22 Extruded Square Pipe

Square Profile, Dual Corrosion Shield

Square profiles slide into structural frameworks, clamp flush to flat surfaces, and resist torsional deflection better than thin-wall rounds of equivalent weight. Add HC-22's approximately 22% chromium and 13% molybdenum, and the pipe holds up in mixed-acid environments — pickling lines, FGD scrubbers, chlorinated organic plants — where 316L pits within months and even C-276 can be borderline in strongly oxidizing conditions. Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. extrudes these profiles in a single pass, yielding seamless corners with no weld seam to become a preferential corrosion path.

HC-22 Square Pipe — Standard Extruded Range

From Billet to Square Profile

C-22 is a high-strength, low-ductility alloy at room temperature — cold forming it into a square cross-section is impractical. Hot extrusion heats the billet above 1150 °C and pushes it through a die in seconds, forming the square profile under compressive forces that compact the grain structure rather than stretch it. Yield stays above 95% and material loss stays below 5%. The resulting HC-22 extruded square pipe carries a smooth, oxide-free inner bore that needs no post-weld mechanical cleaning — a genuine advantage when the pipe will carry aggressive fluids at 150–250 °C.

Where This Profile Works

Chemical plant structural framing that doubles as fluid conduit. Offshore cable trays exposed to salt spray and H₂S. Pharmaceutical clean-room utility headers that must be both acid-resistant and NDT-friendly — flat sides make ultrasonic scanning straightforward. Flue gas desulfurization duct supports where sulfuric acid condensate drips onto the steel. Each heat ships with MTC per EN 10204 3.1 for full traceability, and Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. offers FOB, CIF, and DDP terms for factory-direct RFQ from China.

Frequently Asked Questions

Q: Is HC-22 the same as C-276?

No. HC-22 (UNS N06022) carries higher chromium (~22% vs ~16%) and lower molybdenum (~13% vs ~16%). It outperforms C-276 in oxidizing acids and is slightly less effective in pure reducing acids like concentrated HCl.

Q: Can you produce unequal-wall square tubes in HC-22?

Yes. We can customize wall thickness distribution across the four sides — for example, 3.3 mm on three sides and 13 mm on the bottom for liquid-cooling applications.

Q: What is the minimum order quantity?

MOQ depends on size and wall thickness. Single-length prototypes are possible for development projects — send us your RFQ.

Q: Do you provide mill test certificates?

Every shipment includes MTC to EN 10204 3.1 covering chemical composition, mechanical properties, and hydrostatic or non-destructive test results.

Q: What surface finish options are available?

Standard is as-extruded (light oxide scale). Optional pickling, passivation, or bright annealing available on request.

Q: How does HC-22 square pipe compare to 316L in FGD service?

316L suffers localized pitting and crevice corrosion in wet SO₂ / H₂SO₄ environments within 1–2 years. HC-22 shows negligible mass loss over the same period, making it a lower lifecycle-cost option despite higher upfront price.