Inconel 718 is a high-performance precipitation-hardened nickel-based superalloy, specially developed for the strict and harsh operating environment of nuclear power equipment. It possesses excellent high-temperature strength, outstanding creep resistance, superior corrosion resistance (especially to high-temperature water and reactor coolants), and good radiation resistance. With stable mechanical properties, reliable welding performance and strict quality control, it fully complies with international nuclear power material standards, serving as a core structural material for key components of nuclear power plants (including pressurized water reactors, boiling water reactors), ensuring the safe, stable and long-term operation of nuclear power systems.
Basic Information
| Item | Details |
|---|---|
| Material Grade | Inconel 718, UNS N07718, W.Nr. 2.4668, DIN 2.4668 |
| Executive Standards | ASTM B637, ASTM B622, ASTM B670, ASME SB-637, ASME Section III (Nuclear Grade), AMS 5662 |
| Delivery Condition | Solution annealing + aging treatment, nuclear grade surface treatment |
| Purity Requirement | Ultra-low impurity content, no harmful elements affecting nuclear safety |
| Applicable Nuclear Reactor Type | Pressurized Water Reactor (PWR), Boiling Water Reactor (BWR), Advanced Nuclear Reactors |
Mechanical Properties (Nuclear Grade, Solution & Aging Treated)
| Performance Index | Standard Minimum Value |
|---|---|
| Tensile Strength | ≥1275 MPa |
| 0.2% Yield Strength | ≥1035 MPa |
| Elongation | ≥12% |
| Reduction of Area | ≥40% |
| Hardness | ≤44 HRC |
| Impact Toughness (Room Temperature) | ≥60 J/cm² |
| High-Temperature Creep Strength | ≥690 MPa (650℃, 1000h) |
| Radiation Resistance | No obvious performance degradation after long-term γ-ray radiation |
Dimensional Tolerance (Nuclear Grade Precision)
| Specification | Tolerance Standard |
|---|---|
| Outer Diameter | Strictly comply with ASME Section III and ASTM B637 nuclear grade tolerance, ±0.01mm (precision grade) |
| Wall Thickness | Ultra-precise control, deviation ≤±0.015mm, ensure pressure-bearing safety |
| Product Length | Custom fixed length (1m~12m) or cut-to-size, tolerance ±0.3mm/m |
| Straightness & Roundness | Straightness ≤0.15mm/m; Roundness ≤0.01mm, meet nuclear component assembly precision |
| Surface Finish | Nuclear grade pickling, no burr, no defects, surface roughness Ra ≤0.8μm |
Why Nuclear Power Industry Uses Inconel 718
| Core Advantage | Industry Application Reason |
|---|---|
| Excellent Radiation Resistance | Resist long-term nuclear radiation (γ-ray, neutron radiation) without performance degradation, ensure component safety |
| Superior High-Temperature Creep Resistance | Adapt to long-term high-temperature (600-650℃) operation of nuclear reactor core and primary circuit |
| Strong Corrosion Resistance | Resist corrosion from high-temperature, high-pressure reactor coolant (deionized water, boric acid solution) and steam |
| High Safety & Reliability | Strict nuclear grade quality control, zero material defects, low failure rate, avoid nuclear leakage risks |
| Good Welding Performance | Convenient for on-site welding and assembly of large nuclear components, ensure welding quality and structural integrity |
| Long Service Life | Stable performance for 30-40 years, match the service life of nuclear power plants, reduce maintenance costs |
| Compliance with Nuclear Standards | Meet ASME Section III, ASTM nuclear grade standards, recognized by global nuclear regulatory authorities |
Applicable Working Conditions (Nuclear Power Scenarios)
| Application Field | Actual Working Condition |
|---|---|
| Nuclear Reactor Core Components | High temperature (600-650℃), high pressure (15-18MPa), long-term nuclear radiation, reactor coolant corrosion |
| Primary Circuit System | High-temperature, high-pressure deionized water/steam circulation, radiation environment, pressure-bearing operation |
| Secondary Circuit System | High-temperature steam, medium pressure, no radiation, corrosion resistance to steam and condensate |
| Nuclear Power Heat Exchangers | High temperature difference, high pressure, long-term heat exchange, coolant corrosion |
| Nuclear Valve & Pump Components | High pressure, high temperature, frequent switch, resistance to reactor coolant erosion |
| Nuclear Safety Auxiliary Equipment | Stable operation under extreme conditions (e.g., accident conditions), radiation resistance |
Core User Demands in Nuclear Power Industry
| User Demand | Specific Requirement |
|---|---|
| Nuclear Safety Priority | Meet the highest safety standards, no material defects, avoid nuclear leakage risks |
| Radiation Resistance | Stable performance under long-term nuclear radiation, no performance degradation |
| High-Temperature & Pressure Resistance | Adapt to reactor core and primary circuit high-temperature, high-pressure environment |
| Corrosion Resistance | Resist high-temperature reactor coolant and steam corrosion, long service life |
| Strict Quality Control | 100% inspection, zero defects, complete traceability of material and processing |
| Standard Compliance | Fully comply with ASME Section III, ASTM nuclear grade standards and national nuclear regulations |
| Customization Capability | Support non-standard size, special heat treatment and precision machining for nuclear components |
| Complete Documentation | Provide full set of nuclear grade test reports and certification for regulatory review |
Common Matching Products for Nuclear Power Industry
| Product Category | Main Usage |
|---|---|
| Inconel 718 Seamless Tube | Primary/secondary circuit pipelines, heat exchanger tubes, reactor coolant conveying tubes |
| Inconel 718 Alloy Bar | Nuclear valve stems, pump shafts, reactor core structural bars, high-strength fasteners |
| Inconel 718 Steel Plate | Nuclear reactor pressure vessel liners, heat exchanger shells, safety shell components |
| Inconel 718 Pipe Fittings | Nuclear pipeline elbows, tees, flanges, reducers (pressure-bearing, corrosion-resistant) |
| Inconel 718 Forgings | Nuclear valve bodies, pump impellers, reactor core support components, steam generator parts |
| Inconel 718 Precision Parts | Nuclear instrument components, safety control system parts, radiation-resistant accessories |
Supplementary Information (Nuclear Grade Special Requirements)
| Item | Details |
|---|---|
| Traceability System | Full material traceability from raw material to finished product, complete production record |
| Quality Inspection Process | 100% PMI spectral analysis, UT/RT/MT nondestructive testing, chemical composition and mechanical performance test |
| Surface Treatment | Nuclear grade pickling, passivation, no oxide scale, no contamination, meet nuclear cleanliness requirements |
| Packaging Requirements | Anti-corrosion, anti-contamination packaging, suitable for long-distance transportation and nuclear site storage |
| Transportation Standard | Comply with international nuclear material transportation regulations, with hazard identification and protection measures |
Nuclear Grade Certifications & Test Reports
| Certification/Report Type | Details |
|---|---|
| Quality Certification | ISO 9001, ASME N Stamp (Nuclear Grade Certification), ISO 14001, OHSAS 18001 |
| Test Reports | EN10204 3.2 (Nuclear Grade), MTR Material Test Report, PMI Spectral Analysis Report, UT/RT/MT Nondestructive Testing Report, Creep Test Report, Radiation Resistance Test Report, Corrosion Test Report |
| Regulatory Approval | Compliant with NRC (U.S. Nuclear Regulatory Commission), IAEA (International Atomic Energy Agency) requirements |