Premium Incoloy 825 Alloy Bar for Chemical Processing and Corrosion Resistant Applications

‌1. Product Information‌

‌Product Name‌: Incoloy 825 Bar (Corrosion-Resistant Grade)
‌Material Type‌: Nickel-Iron-Chromium-Molybdenum Superalloy (Austenitic Structure)
‌Standards‌: ASTM B425, ASME SB425, UNS N08825, DIN 2.4858
‌Forms Available‌: Hot-rolled bars, cold-drawn precision bars, and forged bars.
‌Diameter Range‌: 10 mm to 300 mm (custom sizes up to 500 mm).
‌Surface Finish‌: Pickled, ground (Ra ≤ 0.8 μm), or electropolished.
Operating Temperature‌:

• Continuous service: Up to 540°C (1000°F)

• Short-term exposure: 815°C (1500°F)

Certifications‌: NACE MR-0175/ISO 15156, ASME BPV Code Section VIII, PED 2014/68/EU.

‌2. Characteristics‌

Incoloy 825 bars excel in aggressive acidic and chloride-rich environments:

• ‌Pitting/Stress Corrosion Resistance‌: Critical pitting temperature (CPT) >85°C in 6% FeCl₃ per ASTM G48.

• ‌Sulfuric Acid Resistance‌: Corrosion rate <0.1 mm/year in 50% H₂SO₄ at 65°C (per ASTM G31).

• ‌Chloride Ion Tolerance‌: Withstands >10,000 ppm Cl⁻ in seawater without crevice corrosion.

• ‌Hydrogen Embrittlement Immunity‌: No cracking after 200-hour testing in H₂S-saturated brine (NACE TM0177).

• ‌Phase Stability‌: No sigma phase formation after 10,000 hours at 550°C.

• ‌Weldability‌: Compatible with TIG and MIG welding (ERNiCrMo-3 filler recommended).

‌3. Technology‌

‌Manufacturing Process‌:

• ‌Triple Melt Process (VIM + ESR + VAR)‌: Reduces S < 0.005%, O₂ < 20 ppm.

• ‌Controlled Rolling‌: At 950–1100°C to achieve ASTM grain size 5-7.

• ‌Heat Treatment‌:

• Solution annealing at 980–1030°C (1800–1900°F) with water quenching.

• Stabilization at 720°C (1330°F) for 4 hours to precipitate TiC carbides.
  ‌Quality Control‌:

• Intergranular corrosion testing per ASTM G28 Method A.

• Eddy current testing for surface defects (sensitivity ≤0.1 mm).

• Hydrogen charging tests for oil/gas compliance.

‌4. Theory‌

The alloy’s corrosion resistance is rooted in its metallurgical design:

• ‌Molybdenum-Copper Synergy‌: Mo provides pitting resistance in Cl⁻ environments, while Cu enhances reducing acid (H₂SO₄, HCl) resistance.

• ‌Titanium Stabilization‌: Ti combines with residual C to form TiC, preventing Cr-depletion at grain boundaries.

• ‌Nickel Matrix Dominance‌: High Ni content (>40%) ensures stability in both oxidizing and reducing media.

• ‌Passive Layer Formation‌: Cr₂O₃-MoO₃ oxide film with self-healing capability in pH 2–12 environments.

‌5. Application‌

Incoloy 825 bars are indispensable in corrosive industrial systems:

• ‌Oil & Gas‌:

• Downhole tubing hangers, subsea Christmas tree components, and sour gas scrubbers.

• ‌Chemical Processing‌:

• Reactor agitators for sulfuric acid alkylation, phosphoric acid evaporators, and HCl storage systems.

• ‌Marine Engineering‌:

• Seawater-cooled heat exchangers, desalination plant brine heaters, and offshore platform risers.

• ‌Pollution Control‌:

• Flue gas desulfurization (FGD) system dampers and scrubber internals.

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6. Parameters

Our Advantage

1. Market Leader

Top 5 in China's nonferrous metal industry

2. Flexible products

Thousands of product specifications,Meet multiple needs of buyers

3. Low MOQ

Can customize samples

4. Short production lead time，fast delivery of whole cabinet

5. Professional inspection equipment

Before delivery, we will use spectrometers, tensile testers and other professional equipment to conduct a comprehensive inspection of the products to ensure that the goods are qualified for acceptance

6. Professional business team

Quickly responds to customer inquiries,24-hour professional quotation online

The salesperson will follow the customer's requirements for the use of the product,Professionally recommend more appropriate performance and price products to customers

7. Intact packaging

Packaging according to customer needs.You can customize wooden boxes to ensure that the goods arrive at the destination in good condition

8. Various payment methods

Facilitate customer payment

9. Get good reviews from customers

Old customers have long-term cooperation,The longest is more than 7 years

10. Received various awards

Google is very recognized by us,They give us awards every year