Incoloy 926 (UNS N08926) Round Bar, Seamless Tube & Plate Supplier | Shanghai Hangbo Alloy Group
Date: 2026年6月27日 Categories: News Views: 16
By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 Certified | 2026
Quick Answer: What Is Incoloy 926?
Incoloy 926 (UNS N08926 / W.Nr. 1.4529) is a super-austenitic nickel-iron-chromium alloy with high additions of molybdenum (6–7%) and nitrogen. These additions give it a Pitting Resistance Equivalent Number (PREN) greater than 40, placing it far above standard stainless steels and even many duplex grades. It is specifically engineered for highly aggressive chloride-containing media and reducing acid environments, commonly classified alongside the "6Mo" family of superalloys.
Key Advantages
| Advantage | Detail |
|---|---|
| Ultra-High Pitting Resistance | PREN > 40; outperforms 316L (PREN ~25) and standard duplex (PREN ~35) in chloride pitting tests |
| Crevice Corrosion Resistance | Exceptional resistance to crevice attack in stagnant seawater and chloride brines |
| Nitrogen Strengthening | N addition raises yield strength and inhibits sigma phase precipitation |
| Wide Acid Resistance | Resists both reducing (H₂SO₄, H₃PO₄) and oxidizing (HNO₃) acids |
| Chloride SCC Immunity | High Ni content makes it virtually immune to chloride stress-corrosion cracking |
Product Overview
Incoloy 926 (UNS N08926) belongs to the "6Mo" super-austenitic alloy family—materials characterized by 6–7% molybdenum and PREN values exceeding 40. The alloy's chemistry is meticulously balanced: the high chromium and molybdenum provide outstanding resistance to pitting and crevice corrosion, while nitrogen additions both strengthen the austenite matrix and enhance resistance to intermetallic phase precipitation during fabrication.
Top three properties:
- Pitting and crevice corrosion resistance superior to all standard austenitic and duplex stainless steels
- Immunity to chloride stress-corrosion cracking at temperatures where 316L and duplex grades fail
- Stable austenitic structure with good weldability and formability
Primary industries: Desalination, Offshore Oil & Gas, Chemical Processing, Pulp & Paper, Flue Gas Desulfurization.
Founded in 2012, Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer with agents in 32 countries, delivering Incoloy 926 globally in the full range of product forms.
Executive Standards
| Product Form | ASTM | ASME | EN / W.Nr. | DIN |
|---|---|---|---|---|
| Round Bar / Forging | ASTM B649 / B472 | ASME SB-649 | W.Nr. 1.4529 | — |
| Seamless Tube / Pipe | ASTM B677 / B673 | ASME SB-677 | W.Nr. 1.4529 | — |
| Sheet / Plate / Strip | ASTM B625 / B688 | ASME SB-625 | W.Nr. 1.4529 | — |
| Wire | ASTM B649 | — | W.Nr. 1.4529 | — |
Chemical Composition (ASTM B625 / B649)
100% OES (Optical Emission Spectroscopy) chemistry verification is performed on every heat.
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 24.0 | 26.0 |
| Chromium (Cr) | 19.0 | 21.0 |
| Iron (Fe) | Balance | Balance |
| Molybdenum (Mo) | 6.0 | 7.0 |
| Copper (Cu) | 0.5 | 1.5 |
| Nitrogen (N) | 0.15 | 0.25 |
| Carbon (C) | — | 0.020 |
| Manganese (Mn) | — | 2.0 |
| Silicon (Si) | — | 0.5 |
| Phosphorus (P) | — | 0.030 |
| Sulfur (S) | — | 0.010 |
PREN = %Cr + 3.3×%Mo + 16×%N ≈ 43–47 — among the highest of any austenitic alloy in commercial production.
Mechanical & Physical Properties
Room-Temperature Mechanical Properties (Annealed, per ASTM B625)
| Property | Minimum | Typical |
|---|---|---|
| Tensile Strength (UTS) | ≥ 650 MPa (94 ksi) | 700 MPa |
| Yield Strength (0.2%) | ≥ 295 MPa (43 ksi) | 340 MPa |
| Elongation | ≥ 35% | 45% |
| Hardness | — | ≤ 96 HRB |
High-Temperature Strength Retention
| Temperature (°C) | Yield Strength (MPa) | Tensile Strength (MPa) |
|---|---|---|
| 20°C | 340 | 700 |
| 100°C | 290 | 650 |
| 200°C | 255 | 615 |
| 300°C | 235 | 595 |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Range | 1340 – 1380°C |
| Thermal Conductivity | 12 W/m·K (at 100°C) |
| Electrical Resistivity | 1.0 µΩ·m |
How Shanghai Hangbo Produces Incoloy 926
1. Incoloy 926 Round Bars & Forgings
- Melting: EAF (Electric Arc Furnace) → AOD (Argon Oxygen Decarburization) refining to achieve ultra-low carbon (C ≤ 0.020%) and precise nitrogen control — critical for PREN optimization.
- Hot Forging: Precision hot forging at controlled temperatures (1100–1200°C) to fully homogenize the alloy and eliminate segregation.
- Solution Annealing: Full solution anneal at 1100–1150°C with rapid water quench to dissolve any sigma phase and restore full corrosion resistance.
- Finishing: Centerless grinding or peeling to h11/h9 tolerances; surface roughness Ra ≤ 3.2 µm.
- Size range: 10 mm – 500 mm diameter
- Standards: ASTM B649, W.Nr. 1.4529
- QC: OES chemistry + tensile + PREN calculation certificate per heat
2. Incoloy 926 Seamless Tubes & Pipes
- Billet Prep: AOD-refined billets cut and centered for extrusion.
- Hot Extrusion: High-pressure hot extrusion to form mother tubes.
- Cold Reduction: Cold pilgering (for thin walls) or cold drawing to achieve final OD/WT with tight tolerances (±0.1 mm on wall).
- Solution Annealing + NDT: Bright annealing in controlled atmosphere, followed by 100% eddy current (ET) and hydrostatic pressure testing.
- OD range: 6 mm – 219 mm | Wall: 0.5 mm – 20 mm
- Standards: ASTM B677, ASME SB-677
- QC: 100% ET per ASTM E309 + 100% hydrostatic test
3. Incoloy 926 Plates, Sheets & Strips
- Hot Rolling: Slabs hot-rolled with controlled temperature to avoid intermetallic formation.
- Solution Annealing: Annealed at 1100–1150°C to ensure fully austenitic microstructure.
- Pickling / Passivation: Chemical descaling to produce a clean, passive surface with maximum corrosion resistance.
- Inspection & Cutting: UT per ASTM A578 for internal soundness; laser or waterjet cutting to custom dimensions.
- Thickness: 1.0 mm – 80 mm | Width: up to 2,000 mm
- Standards: ASTM B625, ASME SB-625
- QC: UT + flatness inspection ≤ 3 mm/m
Industry Applications
| Industry | Typical Component | Why Incoloy 926? |
|---|---|---|
| Desalination | Multi-stage flash evaporator tubes, brine heaters | PREN > 40 prevents pitting in concentrated seawater |
| Offshore Oil & Gas | Seawater injection piping, heat exchanger tubing | Resists localized corrosion at elevated temperatures |
| Chemical Processing | Sulfuric/phosphoric acid heat exchangers, agitators | Handles both reducing and oxidizing acid media |
| Pulp & Paper | Bleaching equipment, digester lines | Resists hypochlorite and chlorine dioxide solutions |
| Flue Gas Desulfurization | Absorber towers, flue gas coolers | Outstanding resistance to hot sulfurous condensates |
| Marine Engineering | Propeller shafts, fasteners, pump housings | Immunity to seawater pitting and biofouling corrosion |
Quality Assurance: 7-Stage Zero-Defect Inspection
- OES/PMI Verification: 100% optical emission spectroscopy on every heat; Positive Material Identification (PMI) on every finished piece upon request.
- Ultrasonic Testing (UT): Per ASTM A388 / ASTM E2375 to detect internal discontinuities in bars and plates.
- Eddy Current Testing (ET): 100% surface and sub-surface defect detection for seamless tubes per ASTM E309.
- Hydrostatic Testing: Pressure integrity test on all pipes and tubes to 1.5× design pressure.
- Mechanical Testing: Tensile (UTS, Yield, Elongation), Charpy impact, and Vickers/Brinell hardness in our ISO 17025-accredited laboratory.
- Dimensional Report: Full measurement record; OD, WT, length, straightness, Ra surface roughness.
- Visual Inspection: Final surface quality check, heat/lot marking, and packaging integrity sign-off.
Every shipment includes: EN 10204 3.1 Mill Test Certificate (MTC) | ISO 9001:2015 quality documentation | SGS / TÜV / BV third-party inspection available on request.
Frequently Asked Questions (FAQ)
Q1: What is Incoloy 926 used for?
Incoloy 926 is primarily used in desalination plants, offshore seawater injection systems, chemical processing equipment handling mixed acids, and flue gas desulfurization absorbers—wherever PREN > 40 is required to prevent pitting and crevice corrosion.
Q2: What is the maximum service temperature for Incoloy 926?
For aqueous corrosion service, the practical limit is approximately 300°C (572°F). Above this, sigma phase precipitation may reduce corrosion resistance unless fully solution-annealed. For high-temperature oxidation service, other alloys (e.g., Inconel 625) are more appropriate.
Q3: How does Incoloy 926 compare to 316L stainless steel?
316L has a PREN of approximately 23–25, making it susceptible to pitting in warm seawater (>25°C) and chloride brines. Incoloy 926 with PREN > 43 shows no pitting attack under conditions where 316L fails within days. In critical chloride environments, 926 is a direct long-life replacement for 316L.
Q4: How does Incoloy 926 compare to super duplex 2507?
Super duplex 2507 (PREN ~43) has similar localized corrosion resistance but is susceptible to hydrogen embrittlement and has lower toughness at very low temperatures. Incoloy 926 is fully austenitic with excellent toughness at cryogenic temperatures and is preferred where hydrogen exposure or impact loading is a concern.
Q5: What product forms does Shanghai Hangbo supply?
Round bars (10–500 mm), forgings, seamless tubes (OD 6–219 mm), pipes, plates (1–80 mm thick), sheets, strips, and flanges. Custom machined parts are also available through our OEM/ODM service.
Q6: What certifications come with the material?
Full EN 10204 3.1 MTC with chemistry, mechanical properties, and heat treatment details. ISO 9001:2015 quality certificate, ASTM/ASME compliance statement, and PREN calculation record per heat.
Q7: What is the price of Incoloy 926 per kg?
Pricing is driven by current LME nickel and molybdenum rates plus the product form premium. Contact our sales team for a real-time competitive quote.
Q8: Does Shanghai Hangbo ship internationally?
Yes — we serve clients in 32 countries with reliable door-to-door logistics, including DDP and DAP Incoterms. Urgent orders can typically be dispatched within 3–7 business days from stock.
Contact & CTA
| Channel | Information |
|---|---|
| Website | www.nickel-alloy.com |
| specialalloy001@gmail.com | |
| WhatsApp / Phone | +86 13611656360 |
| Skype | +86 13611656360 |
| Address | Shanghai, China |
Response within 10 minutes. OEM/ODM supported. Delivery to 32 countries worldwide.
Related grades: Incoloy 825 (UNS N08825) | Incoloy 925 (UNS N09925) | Incoloy 800H (UNS N08810) | Hastelloy C-276 (UNS N10276) | Inconel 625 (UNS N06625)
Shanghai Hangbo Alloy Group Co., Ltd. — Founded 2012 | ISO 9001:2015 | Specializing in Nickel Alloys, Super-Austenitic Alloys & Special Metals
