Excerpt:
Inconel 602 CA (UNS N06025) supplier — highest oxidation resistance of all Inconel grades to 1200°C. Ideal for radiant tubes, furnace muffles. ASTM-compliant with full MTR.
Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer and global supplier of premium Inconel 602CA (UNS N06025 / W.Nr. 2.4633) round bars, seamless tubes, plates, sheets, strips and forgings. With a yttrium-modified, aluminum-rich chemistry, Inconel 602CA delivers industry-leading oxidation and carburization resistance at service temperatures up to 1200°C (2190°F), making it the first-choice alloy for radiant tubes, furnace muffles and petrochemical heat exchangers.
Standards
- ASTM B166 — Rod, Bar, Wire (Hot-Worked / Annealed)
- ASTM B168 — Plate, Sheet, Strip
- ASTM B167 — Seamless Tube (optional)
- ASME SB166 / SB168 — Pressure Vessel Applications
- UNS N06025 / W.Nr. 2.4633 / DIN 17752-17754
Precise ASTM Chemical Composition (%)
| Element | Range / Max |
|---|---|
| Nickel (Ni) | Balance (min 60.0) |
| Chromium (Cr) | 24.0 – 26.0 |
| Iron (Fe) | 8.0 – 11.0 |
| Aluminum (Al) | 2.0 – 2.6 |
| Carbon (C) | 0.15 – 0.25 |
| Titanium (Ti) | 0.10 – 0.20 |
| Yttrium (Y) | 0.05 – 0.12 |
| Zirconium (Zr) | 0.01 – 0.10 |
| Manganese / Silicon (Mn/Si) | 0.10 max each |
| Sulfur (S) | 0.010 max |
Physical & Mechanical Properties
| Property | Typical Value (Min) |
|---|---|
| Tensile Strength (Annealed Bar, ASTM B166) | 600 MPa (87 ksi) |
| Yield Strength (0.2% Offset) | 250 MPa (36 ksi) |
| Elongation (in 2") | 30% |
| Hardness (Brinell) | ≤ 200 HB |
| Density | 7.93 g/cm³ |
| Melting Range | 1324 – 1368 °C |
| Max Continuous Service Temperature | ~1200 °C (2190 °F) |
Depth Characteristics
- Outstanding Oxidation Resistance: The high aluminum (2.0-2.6%) plus yttrium addition forms an extremely adherent, non-spalling Al2O3 scale, stable under rapid thermal cycling to 1200°C.
- Superior Carburization & Coking Resistance: Effectively blocks carbon diffusion, resisting metal dusting in ethylene pyrolysis and carbon-rich furnace atmospheres.
- Excellent Creep Strength: Maintains structural integrity under long-term high-temperature stress, ideal for radiant tubes and furnace muffles.
- Good Weldability: Weldable by TIG, MIG and SMAW with matching 602CA or 617-type fillers, with no mandatory post-weld heat treatment.
- Hot & Cold Workability: Readily forged and formed; suitable for complex furnace component geometries.
Manufacturing Process — Forging & Heat Treatment
Inconel 602CA is melted by VIM + ESR to guarantee ultra-low impurity levels, then hot-forged at 1000–1200°C with final forging above 950°C to refine grain structure. All products receive solution annealing at 1100–1180°C followed by rapid water quenching to dissolve carbides and deliver a fully homogeneous microstructure. Bars are centerless ground or peeled to tight tolerances; tubes are cold-pilgered and bright annealed under protective atmosphere.
Testing & Inspection Methods — PMI / UT / RT
- PMI (Positive Material Identification): 100% XRF/arc-OES verification of Cr, Al, Y, Ti, Fe on every heat before dispatch.
- UT (Ultrasonic Testing): Full-length ultrasonic examination of bar and tube per ASTM E213/E2375, ensuring freedom from internal defects.
- RT (Radiographic Testing): X-ray/gamma radiography of welded assemblies per ASME Section V.
- Mechanical testing (tensile, yield, elongation, hardness), grain-size evaluation, intergranular corrosion tests and dimensional inspection per ASTM/ASME; EN 10204 3.1/3.2 mill certificates supplied with every order.
High-Frequency Application Scenarios
- Industrial Furnaces: Radiant tubes, muffles, retorts, heat-treatment baskets and roller hearths operating above 1000°C.
- Waste-to-Energy & Incineration: Combustion chamber liners, grate components and flue-gas ducts in aggressive ash environments.
- Petrochemical & Ethylene: Pyrolysis furnace tubes, catalyst support grids and heat exchangers subject to carburization and metal dusting.
- Chemical Processing: Ammonia reformers, nitric acid catalyst grids and high-temperature reactor internals.
- Cement & Lime Kilns: Kiln components exposed to cyclic heating, abrasion and sulfur-bearing fuels.
6+ Professional FAQs
1. What is Inconel 602CA best known for?
It is the benchmark nickel alloy for extreme oxidation and carburization resistance at up to 1200°C, outperforming Inconel 600/601 in thermal cycling and carbon-rich atmospheres.
2. What is the maximum operating temperature?
Continuous service in air up to ~1200°C (2190°F). For mechanical load-bearing components, design stress at 1000-1100°C is typically recommended.
3. How does 602CA differ from Inconel 601?
602CA adds yttrium and higher carbon, improving oxide scale adhesion, creep strength and carburization resistance while maintaining 601-level oxidation performance.
4. Is Inconel 602CA weldable?
Yes. Use GTAW/GMAW/SMAW with matching 602CA filler or Alloy 617-type filler (e.g. ERNiCrCoMo-1). No post-weld heat treatment is mandatory for corrosion performance.
5. Can 602CA be used in metal-dusting environments?
Yes. Its chromium/aluminum-rich protective scale is one of the most effective barriers against metal dusting and coking in synthesis gas and ethylene plants.
6. Which product forms and standards do you supply?
Round bar (ASTM B166, Φ6-500mm), plate/sheet (ASTM B168, 0.5-50mm), seamless tube (ASTM B167) and custom forgings — all with full traceability and 3.1/3.2 certification.
7. Does 602CA require post-forging heat treatment?
Yes, solution annealing at 1100-1180°C with water quenching is required after hot forging to restore ductility and corrosion resistance.
Supply List
- Round Bar: Φ6mm – Φ500mm, peeled/ground, annealed
- Seamless Tube: OD 6mm – 219mm, cold-pilgered, bright annealed
- Plate / Sheet / Strip: Thickness 0.5mm – 50mm, cut-to-size
- Forgings: Flanges, rings, shafts per custom drawings
Need certified Inconel 602CA for your high-temperature project? Contact Shanghai Hangbo Alloy Group for instant quotations, stock availability and mill certificates — quick response within 10 minutes.
