Alloy 230 (UNS N06230) – High-Performance Nickel alloy for Extreme Thermal Cycling

1. Material Overview

Alloy 230 (UNS N06230) is a solid‑solution strengthened Ni‑Cr‑W superalloy, fully compliant with ASTM B435/B564/B619/B622, ASME SB, and AMS 5878/5891. Designed for cyclic thermal environments, it combines exceptional oxidation resistance, creep strength, and thermal fatigue resistance up to 1149°C. Its low thermal expansion and anti‑grain‑coarsening capability give it a clear service life advantage over alloys like 600 and 556. Available as seamless tubes, forged fittings, flanges, plates, and custom forgings, it is the first choice for gas turbine hot sections, furnace components, and high‑temperature piping.

2. Alloy 230 Chemical Composition (wt%)

W and Mo deliver high‑temperature strength; Cr ensures oxidation/sulfidation resistance; trace La locks the oxide scale against spalling.

3. UNS N06230 Physical Properties

The physical properties of INCONEL N06230 are tabulated below.

4. Alloy 230 (UNS N06230) Mechanical Properties

The following table shows mechanical properties of INCONEL N06230.

5. UNS N06230 Heat Treatment & Key Properties

• Heat treatment: Solution annealed at 1177‑1246°C, fast air cool or water quench. Full records, PMI, and mechanical certs per batch.
• Room‑temperature (annealed): Tensile ≥827 MPa, Yield ≥345 MPa, Elongation ≥40%, Hardness ≤240 HB.
• Physical: Density 8.97 g/cm³; Thermal expansion (20‑1000°C) ≈13.1×10⁻⁶/°C. Supports continuous service to 1149°C.

6. Core Advantages of Alloy 230 (UNS N06230)

• Ultra‑high‑temperature cyclic oxidation: Cr‑La oxide film resists spalling through repeated thermal cycles.
• Carburization & nitriding resistance: Effectively blocks carbon/nitrogen ingress, preventing embrittlement.
• Creep & thermal stability: W‑Mo strengthening maintains stable properties and fine grain structure after thousands of hours.
• Low expansion & thermal‑fatigue resistance: Minimizes thermal stress cracking in expansion joints and burner parts.
• Processability & weldability: Excellent hot/cold forming and machining; readily welded with ERNiCrWMo‑1 filler.

7. Our Product Range

• Forged pipe fittings: Elbows, tees, reducers, caps – 1/2″‑48″, SCH10‑SCH160; heavy‑wall options.
• Seamless pipes & tubes: OD 16‑720 mm, WT 3‑90 mm; custom cut lengths.
• Plates, sheets, bars: Forging blanks and CNC machining available.
• High‑temperature flanges & custom forgings: WN, SO, blind, and special furnace shapes.
  All products come with full PMI, mechanical, hardness, UT/MT tests, and EN 10204 3.1 certificates.

8. Applications

Gas turbine liners, transition ducts, flame holders, furnace retorts/radiant tubes, reformer piping, ammonia burners, flue gas ducts, waste incineration parts, vacuum furnace components, and thermal expansion joints.

9. Quality Control & Marking

ISO 9001‑controlled process from raw material recheck to laser marking and vacuum packaging. Defect‑free finish, full traceability: grade, standard, heat number, dimensions. Thickness inspection and chemical testing (PMI) are standard on every order, as shown on our 4″SCH40S ASME B16.9 UNS N06230 elbows.

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