Stainless pipe fitting,stainless fitting,duplex stainless,31803,32750,32760,we are one of largest sour service stainless fitting supplier according to ISO 10156.
1. Material Overview
Inconel 601 (also known as Alloy 601, UNS N06601, W.Nr. 2.4851, GB NS3102) is a solid-solution strengthened austenitic nickel-chromium-iron-aluminum alloy. It is designed for outstanding high-temperature oxidation and corrosion resistance up to 1250°C.
Unlike standard Alloy 600, the addition of aluminum in 601 promotes the formation of a tightly adherent dual oxide barrier (Cr₂O₃ + Al₂O₃). This gives the alloy exceptional resistance to cyclic oxidation, spalling, carburization, and nitriding under long-term thermal shock.
Our advantage: As a fully integrated Chinese manufacturer with in-house vacuum melting, forging, and pipe extrusion capabilities, we produce fully localized Alloy 601 seamless tubes, forged flanges, butt-weld fittings, threaded parts, plates, bars, and custom furnace components. Widely trusted for industrial furnaces, petrochemical reformers, waste incineration, thermal power, and aerospace hot-sections, this is the go-to material for global high-temperature EPC projects.
Compliance Standards: ASTM B163 / B166 / B167 / B564, ASME SB, AMS 5715 / 5870, EN 10095, and GB/T 15007.
2. Inconel 601 Chemical Composition (wt%)
We adopt VIM+VAR double vacuum melting to strictly control impurities and maximize high-temperature strength and weldability.
| Element | Specification (wt%) | Role in Performance |
|---|---|---|
| Nickel (Ni) | 58.00 – 63.00 | Stabilizes austenite, ensures high-temperature toughness |
| Chromium (Cr) | 21.00 – 25.00 | Resists sulfidation and moderate corrosion |
| Aluminum (Al) | 1.00 – 1.70 | Forms stable alumina scale; prevents cyclic oxidation spalling |
| Carbon (C) | ≤ 0.10 | Low carbon avoids intergranular carbide embrittlement |
| Manganese (Mn) | ≤ 1.00 | – |
| Silicon (Si) | ≤ 0.50 | – |
| Copper (Cu) | ≤ 1.00 | – |
| Phosphorus (P) | ≤ 0.020 | Stricter control eliminates hot cracking in forging/welding |
| Sulfur (S) | ≤ 0.015 | Stricter control eliminates hot cracking in forging/welding |
3. Heat Treatment & Mechanical Properties
3.1 Standard Heat Treatment
All products are supplied in the solution-annealed condition:
- Temperature: 1120 – 1175°C
- Holding Time: 30 min to 2 hours (based on wall thickness)
- Cooling: Forced air or water rapid quench
Optional stress relief (760 – 870°C, 1–4 hours) is available for complex welded assemblies. Every shipment comes with complete heat charts, PMI reports, and mechanical test certificates compliant with PED & ASME pressure vessel codes.
3.2 Alloy 601 Room-Temperature Mechanical Properties (Annealed)
| Property | Minimum Value |
|---|---|
| Ultimate Tensile Strength | ≥ 655 MPa |
| 0.2% Offset Yield Strength | ≥ 240 MPa |
| Elongation (50mm gauge) | ≥ 30% |
| Brinell Hardness | ≤ 215 HB |
| Charpy V-notch Impact Toughness | ≥ 120 J |
3.3 Physical & High-Temperature Data of UNS N06601
| Property | Value |
|---|---|
| Density | 8.11 g/cm³ |
| Melting Range | 1320 – 1370°C |
| Mean Linear Expansion (20–1000°C) | 14.1 × 10⁻⁶ /°C |
| Thermal Conductivity (RT) | 11.6 W/m·K |
| Max. Continuous Service Temp. (Oxidation) | 1175°C |
| Max. Intermittent Service Temp. | 1250°C |
| 100h Creep Rupture Strength @ 1000°C | ≥ 25 MPa |
Low thermal expansion minimizes deformation, and the uniform grain structure prevents coarsening after thousands of hours at peak temperature – making it perfect for cyclic furnace operations.
4. Core Performance Advantages
- Superior Cyclic Oxidation & Anti-Spalling: The Cr+Al dual protective layer remains bonded to the base metal. After 1008 hours of static oxidation at 1095°C, metal loss is only 0.067 mm – service life is over 50% longer than Alloy 600 or 310S. Ideal for intermittent burners and flue ducts.
- Strong Anti-Carburization & Anti-Nitriding: Effectively blocks carbon and nitrogen penetration. In 100-hour carburizing tests at 1000°C, carbon pickup is just 10 mg/cm². A top choice for radiant tubes and charging baskets in carburizing/nitriding furnaces.
- Long-Term Creep Stability: The solid-solution matrix maintains structural integrity under sustained high-temperature load. Zero permanent creep deformation for reformer furnace tubes and header flanges, with better cost-performance than Haynes 230.
- Exceptional Thermal Fatigue Resistance: Endures over 12,000 thermal cycles without crack initiation, drastically reducing maintenance on expansion joints and transition sections.
- Mature Domestic Supply Chain: Full localized production from melting to NDT, matched with ERNiCrFe-11 welding wire (low crack sensitivity, no stringent preheat needed on site). Certifications include ISO9001, PED, NACE MR0175, AS9100, significantly cutting delivery times compared to imports.
5. Product Range & Specifications
We leverage China’s forging and pipe-making strengths to deliver the full ASTM/ASME size range:
- Seamless Alloy Tubes: OD 12 – 750 mm, Wall 2 – 95 mm. ASTM B167 heat exchanger tubes; random or custom cut lengths.
- Forged High-Pressure Flanges: WN, SO, BL, SW, NPT types. Class 150 – 2500, RF/RTJ faces. (Stock items: DN300 WNRF, 2″ 300# BL RF).
- Butt-Weld Fittings: 90°/45° elbows, tees, reducers, caps. NPS 1/2″ – 48″, SCH10 – SCH160; heavy-wall customization available.
- Threaded & Socket-Weld Small-Bore Parts: Nipples, plugs, bushings, couplings for instrument and small-diameter piping.
- Plates, Bars & Custom Furnace Forgings: Plates 0.5 – 100 mm, Round Bars Φ5 – 300 mm, plus radiant tube caps and burner blanks machined to your drawings.
Quality Assurance: 100% PMI, tensile/hardness tests, UT/MT/PT triple NDT, full dimensional calibration. All goods supplied with EN 10204 3.1 mill certificates.
6. Typical Applications
- Chemical industry: Inconel 601 industry pipe Equipment and pipes used to handle corrosive media.
- Aerospace: Used in jet engine components and prized for its high-temperature performance.
- Power industry: Inconel 600 seamless tube is used in gas burners, boilers, and heat exchangers.
- Nuclear industry: used in nuclear reactors to handle high temperatures and corrosive media.
7. Quality Control & Marking
Produced under ISO9001:2015 & AS9100D dual quality systems. Full inspection workflow:
Raw Material PMI → Hot Forming → Solution Annealing → Mechanical Testing → Multi-NDT (UT/MT/PT) → Dimensional Inspection → Polishing & Cleaning → Laser Marking → Vacuum Moisture-Proof Packaging.
Final surfaces are free from cracks, inclusions, folds, and oxide scale. Standard laser marking shows: Brand, Alloy 601 / UNS N06601, standard, heat number, and dimensions – fully traceable and accepted by all major third-party inspection agencies.
Ready to upgrade your high-temperature systems with certified Alloy 601 components?
Contact Us today for a fast, competitive quote and check real-time stock availability.
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