Х20Н25 Hot Extruded Seamless Round Pipe

Ji lai da factory’s Х20Н25 hot extruded seamless round pipe is a high-nickel austenitic alloy pipe manufactured according to the GOST Х20Н25 material designation. With approximately 20% chromium and 25% nickel content, this alloy provides enhanced corrosion resistance compared with conventional stainless steel grades such as 304 and 316.

Key Features

1. Chloride Stress Corrosion Cracking Resistance

Chloride stress corrosion cracking is a common failure mode in coastal and high-temperature industrial facilities.

316 stainless steel may suffer cracking when exposed to:
● High chloride concentration
● Temperatures above approximately 60°C
● Salt deposits under insulation
● Stagnant chloride-containing fluids

Х20Н25 hot extruded seamless round pipe provides improved resistance in these conditions due to its higher nickel content, making it suitable for applications where 316 stainless steel performance is insufficient.

2. Hot Extrusion for Stress-Free Seamless Structure

High-nickel alloys typically work-harden faster than standard stainless steel, making cold forming more difficult.

Ji lai da uses hot extrusion technology to form Х20Н25 pipes while the material remains highly workable.

Advantages include:
● No weld seam
● No welding heat-affected zone
● Fine-grained austenitic structure
● Reduced forming stress
● Improved fatigue resistance during thermal cycling

The seamless manufacturing process ensures stable mechanical properties throughout the pipe wall.

3. Cost-Effective Alternative Between 316 and Nickel Alloys

Х20Н25 fills the performance gap between standard stainless steel and premium nickel alloys.

Compared with:

316 Stainless Steel
● Higher nickel content
● Better chloride SCC resistance
● Longer service life in marine environments

C276 / Inconel 625
● Lower material cost
● Suitable for moderate corrosion conditions
● More economical for large-scale piping projects

For engineers balancing corrosion resistance and project budget, Х20Н25 can provide an optimized total lifecycle cost.

Product Parameter

High-nickel alloys work-harden faster than standard stainless, making cold forming difficult and hot working essential. Extrusion above 1 100 °C lets the Х20Н25 hot extruded seamless round pipe take shape while the metal flows freely — no work hardening, no residual stress, no cracking at OD or ID. The resulting pipe has a uniform fine-grained austenitic structure throughout the wall, which matters under combined thermal and mechanical cycling: no residual stress means no hidden starting point for fatigue cracks. Wall thickness is held within ± 0.3 mm, surface is pickled-clean, and billet-to-pipe yield exceeds 95 % at Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd.

* Closest widely-specified Western equivalents. Х20Н25 composition overlaps with high-nickel austenitic grades; confirm with your design consultant for code compliance.

Send your RFQ with the designation your spec uses — GOST Х20Н25, ASTM N08926, or the nearest approved equivalent. Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. will confirm the exact composition against your requirement and issue the EN 10204 3.1 MTC with full heat analysis and mechanical test data. Factory-direct from China, FOB / CIF / DDP to any port. ISO 9001 + 4 additional certifications. One-business-day turnaround on pricing and delivery schedule.

FAQ

Q1: Is Х20Н25 the same as Alloy 825 (N08825)?

Not identical. Alloy 825 adds molybdenum (~3 %) and copper (~2 %) to the 20Cr-25Ni base, giving broader acid resistance. Х20Н25 in the basic GOST composition may or may not include Mo. If your spec requires the Mo and Cu of N08825, state it explicitly and we will produce to that chemistry. If you need the base 20Cr-25Ni without Mo, Х20Н25 is the correct designation.

Q2: When should I step up from Х20Н25 to C276?

When reducing acids (HCl, concentrated H₂SO₄ without oxidizers) are the primary corrosion driver rather than chlorides. C276's 16 % Mo handles reducing media far better. If your problem is chloride SCC at moderate acidity, Х20Н25 is usually sufficient and considerably cheaper per kilogram.

Q3: Can this grade be welded?

Yes. The high nickel content makes Х20Н25 readily weldable by GTAW, GMAW, and SMAW using matching or over-alloyed filler (ERNiCrMo-3 or ERNiCr-3). No preheat required; keep interpass below 150 °C to minimize carbide precipitation. PWHT is not normally required.

Q4: Is this grade available from stock or made to order?

Х20Н25 is less common than 316 or 304, so it is typically produced to order. Lead time 4–6 weeks for standard sizes after order confirmation. We maintain tooling and die sets for the full OD range — no additional setup delay.

Q5: How does the price compare to 316 and C276?

Roughly 1.8–2.5× the price of 316 per kilogram, and roughly 40–60 % of C276. Exact ratio depends on diameter, wall, and market conditions. If your operating window sits between 316 and C276, Х20Н25 often delivers the best cost-per-year-of-service.

Q6: Can you supply test specimens and third-party inspection?

Yes. Separate test coupons can be retained or supplied with each lot. Third-party inspection by SGS, BV, TÜV, or your nominated agency is available. For Gulf projects requiring vendor pre-qualification, we provide the necessary documentation — just specify the approval body.