Inconel 718 is a high-performance precipitation-hardened nickel-based superalloy, specially adapted to the harsh marine environment of ship manufacturing. It has excellent corrosion resistance (especially to seawater, salt spray and marine atmospheric corrosion), outstanding high-temperature strength, good impact resistance and fatigue resistance, and can stably operate under long-term marine humidity, salt corrosion, alternating temperature and high-load conditions. With reliable welding performance, easy precision machining and strict quality control, it fully complies with international marine industry standards, serving as a core material for key components of ships, offshore platforms and marine auxiliary equipment, ensuring the safe, durable and long-term operation of marine equipment.
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, ABS (American Bureau of Shipping), DNV (Det Norske Veritas), LR (Lloyd’s Register) |
| Delivery Condition |
Solution annealing + aging treatment, marine grade anti-corrosion surface treatment |
| Applicable Ship Types |
Cargo ships, cruise ships, offshore supply ships, offshore platforms, naval ships, fishing ships |
| Surface Treatment |
Marine grade pickling, passivation, anti-corrosion coating optional |
Mechanical Properties (Marine 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 |
| Low-Temperature Impact Toughness (-40℃) |
≥50 J/cm² |
| Corrosion Resistance |
Excellent resistance to seawater and salt spray corrosion (no rust after 1000h salt spray test) |
Dimensional Tolerance (Marine Grade Precision)
| Specification |
Tolerance Standard |
| Outer Diameter |
Comply with ASTM B637 and marine industry standards, tolerance ±0.02mm (precision grade) |
| Wall Thickness |
Strict deviation control, ±0.015mm, ensure pressure-bearing and corrosion resistance |
| Product Length |
Custom fixed length (2m~15m) or cut-to-size, tolerance ±0.4mm/m |
| Straightness & Roundness |
Straightness ≤0.2mm/m; Roundness ≤0.015mm, meet ship component assembly requirements |
| Surface Roughness |
Marine grade pickling, Ra ≤0.8μm, no burr, no defects, easy for anti-corrosion coating |
Why Ship Manufacturing Industry Uses Inconel 718
| Core Advantage |
Industry Application Reason |
| Superior Seawater Corrosion Resistance |
Resist long-term erosion of seawater, salt spray and marine atmosphere, avoid component rust and damage |
| Excellent High-Temperature Performance |
Adapt to ship engine (diesel engine, gas turbine) high-temperature working environment (up to 650℃) |
| Strong Impact & Fatigue Resistance |
Bear ship navigation vibration, marine storm impact and alternating load, ensure structural stability |
| Good Welding Performance |
Convenient for on-site welding of large ship components (hulls, pipelines, engine parts), ensure welding strength |
| High Load-Bearing Capacity |
Meet ship structural load-bearing requirements, ensure safe navigation in harsh marine conditions |
| Long Service Life |
Stable performance for 20-30 years, match the service life of ships, reduce maintenance and replacement costs |
| Compliance with Marine Standards |
Recognized by ABS, DNV, LR and other international classification societies, meet shipbuilding industry norms |
Applicable Working Conditions (Ship Manufacturing Scenarios)
| Application Field |
Actual Working Condition |
| Ship Engine Components |
High temperature, high pressure, marine fuel erosion, long-term vibration |
| Ship Hull & Structural Parts |
Marine atmospheric corrosion, seawater immersion, storm impact, alternating temperature |
| Marine Pipeline System |
Seawater, marine fuel and lubricating oil conveying, high pressure, corrosion environment |
| Offshore Platform Components |
Seawater immersion, salt spray corrosion, strong wind and wave impact, long-term outdoor operation |
| Ship Propulsion System |
High load, high speed, seawater erosion, vibration and impact |
| Marine Auxiliary Equipment |
Humid, salt-corrosion environment, stable operation under alternating load |
Core User Demands in Ship Manufacturing Industry
| User Demand |
Specific Requirement |
| Corrosion Resistance |
Resist seawater, salt spray and marine atmospheric corrosion, long service life |
| Structural Safety |
High strength, impact resistance and fatigue resistance, ensure ship navigation safety |
| High-Temperature Adaptability |
Adapt to ship engine high-temperature working environment, stable performance |
| Weldability |
Good welding performance, suitable for on-site assembly of large ship components |
| Standard Compliance |
Meet international marine standards and classification society (ABS/DNV/LR) requirements |
| Batch Stability |
Consistent performance for large-scale shipbuilding projects, ensure component matching |
| Customization Capability |
Support non-standard size and special anti-corrosion treatment for different ship types |
| Complete Documentation |
Provide full set of test reports and certification for ship classification review |
Common Matching Products for Ship Manufacturing Industry
| Product Category |
Main Usage |
| Inconel 718 Seamless Tube |
Marine cooling pipelines, fuel pipelines, seawater conveying pipelines, engine cooling tubes |
| Inconel 718 Alloy Bar |
Ship engine crankshafts, valve stems, propeller shafts, high-strength marine fasteners |
| Inconel 718 Steel Plate |
Ship hull liners, engine casings, offshore platform structural plates, anti-corrosion baffles |
| Inconel 718 Pipe Fittings |
Marine pipeline elbows, tees, flanges, reducers (seawater corrosion-resistant, pressure-bearing) |
| Inconel 718 Forgings |
Ship propellers, valve bodies, pump impellers, engine cylinder heads, offshore platform connectors |
| Inconel 718 Precision Parts |
Marine instrument components, navigation equipment parts, engine auxiliary accessories |
Marine Grade Special Requirements
| Item |
Details |
| Anti-Corrosion Treatment |
Marine grade passivation, anti-corrosion coating (epoxy resin, fluorocarbon coating) optional, enhance seawater corrosion resistance |
| Quality Inspection Process |
100% PMI spectral analysis, UT/MT nondestructive testing, salt spray corrosion test, mechanical performance test |
| Traceability System |
Full material traceability from raw material to finished product, complete production and inspection records |
| Packaging Requirements |
Marine anti-corrosion packaging (moisture-proof, rust-proof), suitable for long-distance marine transportation |
| Installation Guidance |
Provide professional on-site welding and installation guidance, ensure component assembly quality |
Marine Grade Certifications & Test Reports
| Certification/Report Type |
Details |
| Quality Certification |
ISO 9001, ABS (American Bureau of Shipping) Certification, DNV (Det Norske Veritas) Approval, LR (Lloyd’s Register) Certification |
| Test Reports |
EN10204 3.1/3.2, MTR Material Test Report, PMI Spectral Analysis Report, Salt Spray Corrosion Test Report, UT/MT Nondestructive Testing Report, Mechanical Performance Test Report |
| Industry Compliance |
Meet IMO (International Maritime Organization) standards, marine environmental protection requirements |
Packaging
We adopt export-standard packaging, including wooden cases, bundling packaging, plastic end caps and waterproof films to ensure safe transportation.
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