INCONEL 601 (UNS N06601 / W.Nr. 2.4851) is a nickel-chromium-iron alloy engineered as a general-purpose engineering material featuring high-temperature resistance and corrosion resistance.
Most notably, it exhibits exceptional resistance to high-temperature oxidation, along with good resistance to aqueous corrosion, high mechanical strength, and excellent workability for forming, machining, and welding operations.
Inconel 601H is a specialized high-carbon, controlled-grain-size variant of standard Inconel 601, engineered specifically to deliver superior creep and stress-rupture resistance at elevated temperatures.
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More information about Inconel 601H 2.4851 Forged Round Bar
| Product Name | Inconel 601H Round Bar |
| Size In Stock | Inconel 601 Round Bar 9.53 to 266.7 mm |
| Test Certificate | Under Third-Party Inspection Manufacturer Test Certificate |
| Customized Services | Support Customization |
| Packaging Details | Standard Export Seaworthy Packing Or As Required |
Inconel 601H UNS N06601 Equivalent Grades
| STANDARD | UNS | EN | AFNOR | WERKSTOFF NR. | JIS | DIN | BS |
| Inconel 601 | N06601 | NiCr23Fe | NC23FeA | 2.4851 | NCF 601 | 2.4851 | NA 49 |
Inconel 601H Round Bar Chemical Composition(%)
| Element | Composition (%) |
| Nickel (Ni) | 58-63 |
| Chromium (Cr) | 21-25 |
| Iron (Fe) | Balance |
| Aluminum (Al) | 1.0-1.7 |
| Titanium (Ti) | 0.35 max |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 0.50 max |
| Sulfur (S) | 0.015 max |
| Copper (Cu) | 1.0 max |
Inconel 601H Round Bar Mechanical Property
| Property | Value |
| Tensile Strength | 650 MPa (94 ksi) |
| Yield Strength (0.2% offset) | 310 MPa (45 ksi) |
| Elongation | 0.3 |
| Hardness | 85 HRB |
Inconel 601H Round Bar Physical Property
| Property | Value |
| Density | 8.11 g/cm³ |
| Melting Range | 1360-1411°C (2480-2572°F) |
| Specific Heat Capacity | 427 J/kg·K |
| Thermal Conductivity | 12.0 W/m·K (at 100°C) |
| Electrical Resistivity | 1.18 µΩ·m (at 20°C) |
| Thermal Expansion | 13.3 µm/m·K (20-1000°C) |
What Is The Difference Between Inconel 601 And Inconel 601H?
Chemical Composition：
Inconel 601 and Inconel 601H exhibit nearly‑identical base chemistry. The key distinction lies in Inconel 601H, which applies narrow carbon limits plus controlled grain‑size specification to optimise its high‑temperature mechanical behaviour.
Carbon Content：
- Inconel 601: carbon maximum is 0.10 %, with no lower‑bound carbon requirement.
- Inconel 601H: carbon is restricted within a controlled range of 0.05 %‑0.10 %. This constrained carbon band is engineered to boost high‑temperature creep‑rupture performance for long‑term thermal service.
Grain Size
- Inconel 601: no mandatory grain‑size specification is defined in standard requirements.
- Inconel 601H: manufactured under enforced grain‑size controls, delivering enhanced high‑temperature strength and microstructural stability under sustained heat exposure.
High‑Temperature Performance
- Inconel 601: delivers reliable oxidation and corrosion resistance for service peaks reaching 1250 °C (2280 °F), suited for intermittent or general high‑temperature duty.
- Inconel 601H: optimised for prolonged thermal exposure at up to 1250 °C (2280 °F). It provides superior resistance against high‑temperature creep and stress‑rupture failure under sustained load.
Applications
- Inconel 601: widely selected for industrial heating hardware, furnace parts, gas‑turbine assemblies and general chemical‑processing equipment.
- Inconel 601H: preferred for continuous high‑temperature operating conditions, including heat‑treatment hardware, industrial furnaces, radiant tubes and high‑heat chemical‑processing environments.
Summary
Though the two alloys overlap in many properties and application fields, Inconel 601H benefits from its constrained carbon range and regulated grain structure. It is the preferred grade for components where creep resistance and long‑term microstructural stability under heat are primary design concerns. Inconel 601 offers flexible, general‑purpose high‑temperature service with robust oxidation resistance for less demanding sustained‑load scenarios.
What's The Feature Of Inconel 601H Steel?
High‑Temperature Oxidation Resistance
It maintains surface oxidation‑resistance up to 1250 °C. Its chromium‑rich oxide scale inhibits continuous oxidation loss under repeated thermal‑cycling high‑temperature operating conditions.
01
Carburization Resistance
It resists carbon penetration at service temperatures ranging from 800 °C to 1100 °C. The alloy matrix restricts carbide layer build‑up when exposed to carburizing furnace atmospheres over long service cycles.
02
Oxidation Resistance in Sulphur‑Bearing Atmospheres
It sustains oxidation resistance within sulphur‑bearing high‑temperature gas. The alloy suppresses accelerated scale degradation when operating in mixed oxidizing‑sulphurous industrial flue‑gas environments.
03
Stress‑Corrosion Cracking Resistance
It exhibits resistance to chloride‑driven stress‑corrosion cracking. Under moderate tensile load, it reduces crack initiation risk when exposed to aqueous chloride‑containing corrosive process media.
04
Inconel 601H Heat Treatment & Delivery Condition
Annealed Condition：
Inconel 601H is typically annealed at 870–980 °C, followed by slow cooling. This delivery state delivers moderate tensile strength and improved ductility, easing subsequent machining and forming operations. The microstructure is a recrystallized austenitic matrix with fine precipitates. It is suitable for components requiring further fabrication, but its creep resistance is lower compared to the solution‑treated condition.
Solution Treated Condition：
Solution treatment is performed at 1120–1175 °C, then rapidly cooled. This state dissolves precipitates to achieve a uniform, coarse austenitic grain structure. Controlled grain size is the core feature of 601H in this condition, delivering outstanding high‑temperature creep and stress‑rupture properties. It is the preferred delivery state for parts operating under long‑term sustained high temperature and load, such as radiant tubes and furnace hardware.
Inconel 601 vs Other Grades Performance & Application Comparison Table
| Alloy Grade | Core Feature | Max Oxidation‑Resistant Temperature | Strength Level | Cost Level | Best‑Fit Application Scenarios |
|---|---|---|---|---|---|
| Inconel 601 | High‑temperature oxidation resistance | ≤1180 °C | Medium | Medium‑high | Furnace trays, waste‑gas equipment, incinerators |
| Inconel 600 | General‑purpose corrosion resistance | ≤1100 °C | Medium | Medium | Furnace retorts, general‑purpose chemical components |
| Inconel 602CA | Creep resistance & thermal‑corrosion resistance | ≤1200 °C class | Medium‑high | High | Radiant tubes, carburizing and nitriding atmosphere equipment |
| Inconel 625 | Broad‑range temperature corrosion resistance | ≤950 °C | High | High | Off‑shore marine engineering, gas turbine components |
| Inconel 825/926 | Aqueous corrosion resistance | Ambient to moderate temperature | Medium | Medium | Wet‑process chemical corrosion service environments |
Inconel 601H UNS N06601 Round Bar Machining & Welding
- Carburization Resistance: It delivers superior anti‑carburizing performance compared with Incoloy 800 and similar nickel‑iron‑chromium grades. It restricts carbon atom penetration under high‑temperature carburizing atmosphere, lowering internal carbide accumulation for long‑term furnace‑service components.
- Forming: Hot forming shall be carried out within 870‑1230 °C (1600‑2250 °F). Sufficient soaking time is required for uniform temperature distribution across workpiece section. For cold forming, work‑hardening effect shall be taken into account. Intermediate stress‑relief annealing is recommended for heavy cold deformation to avoid cracking risk.
- Welding: Matching Inconel 601 filler metal is the preferred consumable. Select appropriate welding filler materials according to actual operating temperature of final parts. GTAW / GMAW welding processes are commonly adopted. Pre‑heating is generally not required, yet inter‑pass temperature should be controlled to prevent grain coarsening.
- Heat Treatment: Annealed and solution‑treated conditions produce distinct mechanical and high‑temperature properties. Annealing delivers better machinability, while solution treatment optimizes grain structure and creep‑rupture performance for high‑temperature load‑bearing service.
Alloy 601H Applications
Heat‑Treatment Industry Furnace trays, charge baskets and tooling fixtures subjected to cyclic high‑temperature exposure; wire strand annealing
assemblies and radiant tubes for continuous thermal processing; high‑velocity gas burner components and woven furnace mesh belts. These components endure repeated heating‑cooling cycles, carburizing and oxidizing atmospheres inside industrial furnaces.
Petrochemical & Chemical Industry Ammonia reformer isolation vessels and catalyst support grids for nitric‑acid production units; exhaust system hardware, combustion chambers for solid‑waste incinerators and waste‑gas detoxification systems. These parts operate under combined high‑temperature thermal load plus corrosive flue‑gas attack.
Other Industrial Fields High‑temperature pipe support members, ash‑handling and soot‑processing components, and oxygen re‑heater assemblies. These parts are required to sustain long‑term service under elevated temperature with moderate mechanical loading.
FAQ:
Q: How do I choose between Inconel 600 and Inconel 601?
A: Depends on service conditions. Select Inconel 600 for pure aqueous‑corrosion and general‑purpose chemical environments. Choose Inconel 601 for cyclic high‑temperature service, sulphur‑bearing atmospheres and requirements for spall‑resistant oxide scale. Inconel 601 features higher chromium‑aluminum content and superior thermal‑shock resistance.
Q: Can Inconel 601 be age‑hardened?
A: No. It is a solid‑solution strengthened alloy, supplied in softened condition after annealing or solution treatment. Do not specify age‑hardening requirements; no strengthening precipitates will form during aging treatment.
Q: Why do strength values for Inconel 601 vary widely among different suppliers?
A: Tensile strength Rm ≥650 MPa for annealed condition and Rm ≥600 MPa for solution‑treated condition, which is determined by delivery condition. Clarify your application and required delivery condition when making material inquiries.
Q: What pitfalls exist during Inconel 601 processing and welding?
A: Its high elevated‑temperature strength requires higher‑capacity equipment for hot & cold forming. It can be welded by conventional processes. Keep workpiece surface clean during heating; avoid contamination from low‑melting‑point impurities such as sulphur, phosphorus and lead to prevent embrittlement.
Q: Is Inconel 601 suitable for service above 500 °C?
A: Yes. Controlled carbon content and grain size of Inconel 601 are engineered for creep‑rupture strength above 500 °C. If aqueous corrosion resistance is your primary requirement, consider alternative alloys such as 825 or 926.
