Products Features
Outstanding Comprehensive Corrosion Resistance
It exhibits extremely strong resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking. It remains stable in strong acids (such as sulfuric acid, hydrochloric acid, hydrofluoric acid), acidic gases (such as H₂S, CO₂), and oxidizing media, with performance far exceeding that of ordinary nickel-based alloys.
High Strength and Fatigue Resistance
Through solid solution strengthening with molybdenum and tungsten, it maintains good strength and fatigue resistance at both room and high temperatures, making it suitable for high-stress, alternating load conditions.
Excellent Machining and Welding Performance
It has good cold and hot working properties as well as welding performance, and can be processed into various forms such as plates, strips, bars, wires, and tubes to meet complex industrial requirements.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
≥ 58.0% |
Matrix elements that provide corrosion resistance |
|
Cr |
19.0 - 23.0% |
Provide antioxidant and corrosion resistance capabilities |
|
Mo |
15.0 - 17.0% |
Enhance resistance to corrosion in reducing media |
|
W |
3.0 - 4.4% |
Enhance resistance to pitting and crevice corrosion |
|
Fe |
≤ 5.0% |
Structural support |
|
C |
≤ 0.010% |
Strict control |
|
Si |
≤ 0.08% |
Oxygen absorber |
|
Mn |
≤ 0.75% |
Oxygen absorber |
|
P |
≤ 0.020% |
Impurity elements |
|
S |
≤ 0.010% |
Prevent hot brittleness |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
8.69g/cm³ |
Room temperature (20°C) |
|
Melting Point |
1330 - 1380°C |
- |
|
Specific Heat Capacity |
420 J/kg·K |
20°C |
Mechanical Properties (Solution Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 690 MPa |
ASTM B574 / B575 |
|
Yield Strength |
≥ 310 MPa |
ASTM B574 / B575 |
|
Elongation |
≥ 40% |
ASTM B574 / B575 |
|
Hardness |
≤ 100 HRB (or ≤ 210 HB) |
- |
High-temperature Performance
Tensile strength remains above approximately 450 MPa at 700°C.
Long-term Temperature Range
Recommended -200°C to 980°C.
Maximum Intermittent Heat Resistance: Up to 980°C.
Oxidation Resistance: The oxidation rate is low in static air at 980°C, and the oxidation film has good adhesion.
Creep Resistance: Exceeds most stainless steels under temperatures of 700–900°C and moderate stress.
Application Fields
-
Chemical Processing Equipment (Reactors, Heat Exchangers, Towers)
-
Pollution Control Systems (Flue Gas Desulfurization, Waste Incineration)
-
Offshore Engineering (Seawater Pipelines, Pumps, Valves)
-
Equipment for Acidic Oil and Gas Field Development
-
Nuclear Power Systems (Coolant Pipelines, Tanks)
-
Aerospace (High-Temperature Corrosion-Resistant Components)
-
Heat Exchangers
-
High-Temperature Fasteners and Hardware
-
Concentration Equipment for Sulfuric Acid/Hydrochloric Acid/Phosphoric Acid
-
Chlorine and Fluorine-Containing Medium Environments
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Inconel 686 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
|
Customization Capability |
Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting |
Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions |
Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length) |
Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films |
Special surface treatment, precision drawing |
Why Choose Us? - Reliable engineering technology. Dependable delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of Inconel 686?
Q: What kind of heat treatment does Inconel 686 require?
Q: What is the maximum operating temperature?
Q: What is the difference from Inconel 625?
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