N08031 Nickel Based Alloy Seamless Pipe

Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. produces N08031 nickel based alloy seamless pipe across the full size range of OD 6 mm to 89 mm, wall thickness 3 mm to 9 mm, and lengths from 3,000 mm to 10,000 mm. Each pipe is hot-extruded from a single billet into a seamless hollow, achieving a material yield rate of ≥ 95% with raw material loss below 5%. The as-extruded product features smooth internal and external surfaces — a direct benefit of our near-net-shape process that minimizes post-extrusion finishing work and cost for bulk-order customers.

N08031 is classified as a super-austenitic nickel-iron-chromium alloy. Unlike Inconel 718, which is precipitation-hardened for extreme mechanical strength at elevated temperature, N08031 is a solid-solution alloy optimized for corrosion performance. The deliberate combination of high chromium (27%) for oxidizing-acid resistance, high molybdenum (6.5%) for reducing-acid and pitting resistance, and copper (1.2%) for sulfuric acid attack suppression creates an alloy that thrives where conventional stainless steels and even some nickel alloys fail. When your project involves sulfuric acid at concentrations above 50%, phosphoric acid contaminated with chlorides, or hydrofluoric-sulfuric acid mixtures, N08031 nickel based alloy seamless pipe from Ji lai da is the technically correct and cost-effective selection.

Product Parameter

Key Features

Dual-Mode Corrosion Resistance — Where Inconel 718 and C276 Fall Short

Inconel 718 was designed for strength, not corrosion — its 19% Cr and 3% Mo cannot protect against severe acid attack. C276 excels in reducing acids but lacks the chromium content for strong oxidizing resistance. N08031 nickel based alloy seamless pipe bridges both worlds: 27% chromium shields against oxidizing acids (nitric, chromic), while 6.5% molybdenum and 1.2% copper defend against reducing acids (sulfuric, phosphoric, hydrofluoric). In sulfuric acid concentrations of 50–80%, N08031 outperforms Inconel 625, C276, and 904L — a fact confirmed by ISO 6509 and ASTM G48 test data from Ji lai da's quality lab.

Superior Pitting and Crevice Corrosion Resistance

With a Pitting Resistance Equivalent Number (PREN) exceeding 45 — calculated as %Cr + 3.3×%Mo + 16×%N — N08031 nickel based alloy seamless pipe far surpasses 316 (PREN ≈ 23–28) and 904L (PREN ≈ 35), and is competitive with C276 (PREN ≈ 45–50). In practical terms, this means the alloy resists pitting initiation in warm seawater, chloride-laden flue gas condensates, and bleach plant liquors that would perforate standard austenitic pipe within months. For EPC contractors specifying flue gas desulfurization (FGD) scrubbers, N08031 from Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. is often the optimal balance of performance and cost.

Hot Extrusion — High Yield, Low Loss, Superior Surface

Unlike Inconel 718 which requires carefully controlled precipitation-aging heat treatments to develop its strength, N08031 is used in the solution-annealed condition — its corrosion resistance and mechanical properties are fully developed by the hot extrusion and subsequent solution treatment cycle. Ji lai da's hot extrusion process for N08031 nickel based alloy seamless pipe achieves ≥ 95% material yield with < 5% loss, producing as-extruded surfaces that are bright and free from laps, tears, or oxide scale. This translates to lower finishing costs and faster delivery for mill-run quality orders.

Excellent Mechanical Properties in the Solution-Annealed Condition

N08031 delivers a minimum yield strength of approximately 276 MPa and tensile strength above 690 MPa in the solution-annealed state — significantly higher than 316L (~205 MPa yield) and comparable to many higher-nickel alloys. The 0.2% nitrogen addition provides interstitial solid-solution strengthening without sacrificing ductility or toughness. Welded fabrication is straightforward: N08031 can be joined using standard TIG/MIG processes with matching filler metals (ERNiCrMo-13) and does not require post-weld heat treatment to restore corrosion resistance — unlike Inconel 718, which is sensitive to strain-age cracking during welding.

Factory-Direct China Supply with Complete Documentation

Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. is a genuine manufacturer, not a trading company. Every N08031 nickel based alloy seamless pipe ships with EN 10204 3.1 Mill Test Certificates detailing chemical composition, mechanical properties, and dimensional inspection. We support third-party verification by SGS, BV, TÜV, or Lloyd's Register, and provide full FOB / CIF / DDP logistics coordination. For procurement teams managing long-term supply agreements or blanket orders, Ji lai da offers stable pricing, consistent quality, and reliable lead times.

Product Application

N08031 nickel based alloy seamless pipe from Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. is specified where mixed-acid, halide, and oxidizing-reducing corrosion environments exceed the capability of 316, 904L, and even some nickel alloys:

● Flue Gas Desulfurization (FGD): scrubber inlet and outlet ducts, absorber tower internal piping, slurry spray nozzles — where SO₂, chlorides, and sulfuric acid condensate coexist.
● Sulfuric Acid Production & Processing: concentration and absorption tower piping, acid coolers, heat exchanger tubes handling 50–98% H₂SO₄ at elevated temperatures.
● Phosphoric Acid & Fertilizer: digester piping, evaporator tubes, and acid transport lines in wet-process phosphoric acid plants with fluoride and chloride contamination.
● Pulp & Paper: bleach plant C/D-stage piping, chlorine dioxide generators, and acid wash systems.
● Pharmaceutical & Fine Chemical: reactor cooling coils, vent scrubbers, and waste acid recovery piping in multipurpose batch plants.
● Seawater & Brackish Water: reverse osmosis pre-treatment piping, desalination heat exchangers, and offshore produced-water handling systems.

Frequently Asked Questions (FAQ)

Q1: How does N08031 compare to Inconel 718 for corrosive service?

A: They serve completely different purposes. Inconel 718 is a precipitation-hardening superalloy optimized for high-temperature mechanical strength — its 19% Cr and only 3% Mo make it a moderate performer in aggressive acid environments. N08031 nickel based alloy seamless pipe, by contrast, is a solid-solution alloy with 27% Cr, 6.5% Mo, and 1.2% Cu, specifically designed for mixed-acid and halide corrosion resistance. If your primary challenge is corrosion rather than strength at 650 °C, N08031 is the superior and more economical choice.

Q2: When should I choose N08031 over C276 or Inconel 625?

A: In sulfuric acid concentrations of 50–80%, N08031 frequently outperforms both C276 and Inconel 625 due to its higher chromium content (27% vs. 16% for C276 and 22% for 625) combined with the copper addition. In pure reducing-acid service (e.g., concentrated HCl), C276 may still have an edge. For oxidizing-acid-dominated environments (e.g., nitric acid plant piping), 625 and N08031 are competitive. The sweet spot for N08031 is mixed oxidizing-reducing conditions — FGD scrubbers, phosphoric acid with fluorides, and sulfuric acid at medium-to-high concentrations — where no single-alloy competitor matches its balanced performance.

Q3: Can N08031 be welded without post-weld heat treatment?

A: Yes. Unlike Inconel 718, which is susceptible to strain-age cracking and requires careful thermal management during and after welding, N08031 nickel based alloy seamless pipe is readily weldable using TIG (GTAW) or MIG (GMAW) with ERNiCrMo-13 filler wire. Post-weld heat treatment is not required to restore corrosion resistance — the alloy's high nitrogen and low carbon content naturally prevent sensitization and intergranular attack in the heat-affected zone. This makes field fabrication and on-site welding significantly easier and more economical.

Q4: What dimensional tolerances does Ji lai da guarantee?

A: Our N08031 nickel based alloy seamless pipe is produced within OD 6–89 mm, WT 3–9 mm, and length 3,000–10,000 mm. Dimensional tolerances comply with ASTM B619 / B775 for nickel alloy seamless pipe. For projects with tighter requirements, Jiangsu Ji Lai Da Nickel-Based Alloy Co., Ltd. can perform cold-finishing or machining to achieve tolerances specified by your engineering team — please include your tolerance sheet with the RFQ.

Q5: What is the typical lead time for a bulk order?

A: As a factory-direct China manufacturer, Ji lai da controls the entire production chain from billet procurement through hot extrusion, solution annealing, straightening, and inspection. Standard production lead time is 30–45 days for N08031 nickel based alloy seamless pipe, depending on quantity and specification. Stock material may be available for common sizes — contact us with your proforma invoice requirements and we will confirm the fastest possible delivery schedule.