Inconel 718 bar is a marine-grade nickel-based superalloy with exceptional seawater corrosion resistance, high strength and fatigue resistance, specially engineered for manufacturing critical components of ships and offshore engineering equipment operating in harsh marine environments.
As a core material for shipbuilding, Inconel 718 bar can withstand long-term salt spray erosion, seawater immersion, vibration impact and temperature changes, effectively extending the service life of marine equipment and ensuring safe navigation of ships.
| Item | Details |
|---|---|
| Executive Standards | 1. International Marine Standards: ASTM B637, AMS 5662, DIN 17752, EN 2.4668;
2. Classification Society Standards: ABS (American Bureau of Shipping), DNV (Det Norske Veritas), LR (Lloyd’s Register), BV (Bureau Veritas), CCS (China Classification Society); 3. Quality System Certification: ISO 9001, ISO 14001, OHSAS 18001; 4. Testing Standards: ASTM E8 (Tensile Testing), ASTM E23 (Impact Testing), ASTM G48 (Seawater Corrosion Testing), ASTM E466 (Fatigue Testing). |
| Material Grade | 1. Main Grade: Inconel 718 (Marine Grade);
2. International Designations: UNS N07718, W.Nr. 2.4668, EN 2.4668; 3. Equivalent Grades: GB GH4169, JIS NW7718, fully compatible with global shipbuilding standards. |
| Chemical Composition (Weight %) | 1. Nickel (Ni): 50.00 – 55.00;
2. Chromium (Cr): 17.00 – 21.00; 3. Iron (Fe): 14.00 – 18.00; 4. Molybdenum (Mo): 2.80 – 3.30; 5. Niobium (Nb): 4.75 – 5.50; 6. Titanium (Ti): 0.65 – 1.15; 7. Aluminum (Al): 0.20 – 0.80; 8. Carbon (C): ≤0.08; 9. Manganese (Mn): ≤0.35; 10. Silicon (Si): ≤0.35; 11. Phosphorus (P): ≤0.015; 12. Sulfur (S): ≤0.015; 13. Copper (Cu): ≤0.30. |
| Mechanical Properties (Marine-Grade Annealed State) | 1. Tensile Strength: ≥1240 MPa;
2. 0.2% Yield Strength: ≥860 MPa; 3. Elongation (δ5): ≥15%; 4. Reduction of Area (ψ): ≥30%; 5. Hardness (HB): 300 – 380; 6. Low-Temperature Impact Toughness (-40℃): ≥50 J (marine grade requirement); 7. Fatigue Strength (10⁷ Cycles): ≥550 MPa; 8. High-Temperature Tensile Strength (650℃): ≥900 MPa; 9. Corrosion Resistance: Corrosion rate ≤0.02mm/year in 3.5% NaCl solution. |
| Dimensional Tolerance (Marine-Grade Precision) | 1. Diameter Tolerance: Precision Grade (≤50mm): ±0.015mm; Ordinary Grade (50-100mm): ±0.02mm;
2. Length Tolerance: Fixed Length (1m-6m): ±0.2mm/m, maximum full-length tolerance ≤0.8mm; customizable length up to 12m; 3. Straightness: ≤0.15mm/m, full-length straightness error ≤0.4mm/6m; 4. Roundness: ≤0.01mm (diameter ≤50mm); ≤0.015mm (diameter 50-100mm); 5. Surface Finish: Ra ≤0.8μm, no scratches, no oxide scale, no burrs. |
| Why the Ship Manufacturing Industry Uses This Material (Detailed) | 1. Extreme Marine Environment Adaptability: Ships operate in harsh marine environments with high salt content, high humidity, and frequent temperature changes. Ordinary carbon steel will rust and corrode within 3-5 years, while 304/316 stainless steel is prone to pitting and crevice corrosion in seawater. Inconel 718 forms a dense passive film on the surface, which can resist long-term seawater immersion and salt spray erosion, with a service life of more than 20 years.
2. Superior Stress Corrosion Cracking Resistance: Marine equipment is subject to the combined action of tensile stress and corrosive media, which is the main cause of component failure. Inconel 718 has excellent resistance to chloride ion stress corrosion cracking, which can effectively avoid sudden fracture of components and ensure navigation safety. 3. Excellent Fatigue and Impact Resistance: Ships are subject to continuous vibration from engines, propellers and waves, as well as impact loads from storms and collisions. Inconel 718 has high fatigue strength and impact toughness, which can withstand long-term alternating loads and sudden impacts, reducing the failure rate of key components. 4. Wide Temperature Adaptability: Ships sail in global waters, from polar regions (-40℃) to tropical oceans (60℃), and some equipment (such as engine exhaust systems) works at temperatures up to 650℃. Inconel 718 maintains stable mechanical properties in this wide temperature range, without brittle fracture at low temperatures or softening at high temperatures. 5. Good Weldability and Formability: Marine components have complex shapes and require a lot of welding and forming processes. Inconel 718 has excellent weldability, and the weld strength can reach more than 90% of the base metal. It also has good hot and cold forming properties, which is convenient for manufacturing various complex marine parts. 6. Low Maintenance Cost: Marine equipment maintenance is difficult and expensive, especially for offshore engineering equipment. The long service life and high reliability of Inconel 718 can greatly reduce maintenance frequency and downtime, significantly reducing the total life cycle cost of ships. |
| Application Scenarios & Corresponding Customers (Detailed) | Application Scenarios:
1. Marine Power System: Engine crankshafts, connecting rods, valve stems, turbocharger blades, exhaust manifold components, fuel injection system parts; 2. Propulsion System: Propeller shafts, stern shafts, rudder stocks, gearbox gears and shafts, thruster components; 3. Seawater System: Seawater pump shafts, valve cores, pipeline connectors, heat exchanger components, desalination equipment parts; 4. Deck Machinery: Crane shafts, winch gears, anchor windlass components, hydraulic cylinder rods, mooring equipment parts; 5. Ship Structure: High-strength structural parts for special ships (LNG carriers, chemical tankers), hull reinforcement components, offshore platform structural parts; 6. Offshore Engineering Equipment: Oil and gas platform riser components, subsea production equipment parts, offshore wind turbine components, subsea pipeline connectors; 7. Navigation and Control System: Precision instrument shafts, sensor brackets, radar equipment components. Corresponding Customers: 1. Global commercial shipyards (container ships, bulk carriers, oil tankers, LNG carriers); 2. Naval shipyards and defense contractors (warships, submarines, coast guard vessels); 3. Marine equipment manufacturers (engines, propellers, pumps, valves, deck machinery); 4. Offshore engineering companies (oil and gas platforms, offshore wind farms, subsea engineering); 5. Ship repair and maintenance yards worldwide; 6. Shipping companies and ship owners for equipment replacement and upgrading; 7. Marine design institutes and classification societies. |
| Corresponding User Needs in Ship Manufacturing Industry (Detailed) | 1. Long Service Life Demand: Ships have a design life of 25-30 years, and offshore engineering equipment has a design life of 40-50 years. Users need materials that can maintain stable performance for a long time without frequent replacement.
2. High Reliability Demand: Marine equipment failure at sea will cause huge economic losses and even safety accidents. Users have zero tolerance for component failure, requiring materials with extremely high reliability and safety. 3. Extreme Environment Resistance Demand: Ships sail in various harsh environments, including polar ice regions, tropical oceans, and high-salt offshore areas. Users need materials that can adapt to different climate and environmental conditions. 4. Strict Compliance Demand: Shipbuilding industry is highly regulated, and all materials must obtain certification from international classification societies (ABS, DNV, LR, etc.). Users need products that meet the latest industry standards and certification requirements. 5. Precision Assembly Demand: Marine equipment has strict assembly tolerances, especially for power and propulsion systems. Users need materials with high dimensional precision and stable batch performance to ensure assembly accuracy. 6. Processability Demand: Marine components have complex shapes and require various processing technologies such as forging, machining, and welding. Users need materials with good processability to reduce processing difficulty and cost. 7. Cost-Effectiveness Demand: While pursuing high quality, users also need to control costs. They hope to obtain cost-effective materials that can reduce total life cycle costs through long service life and low maintenance. 8. Customization Demand: Different types of ships (LNG carriers, chemical tankers, warships) have different requirements for material performance. Users need customized products according to specific application scenarios and technical requirements. |
| Common Related Products in Ship Manufacturing Industry | 1. Inconel 718 Marine Forgings: Used for large components such as propeller shafts, crankshafts, rudder stocks, and offshore platform structural parts;
2. Inconel 718 Marine Welding Wire: Special welding material for marine equipment, ensuring weld strength and corrosion resistance; 3. Inconel 718 Marine Tube: Used for seawater pipelines, heat exchanger tubes, hydraulic pipelines, and exhaust pipes; 4. Inconel 718 Marine Sheet/Plate: Used for ship hull plates, equipment casings, heat exchanger plates, and offshore platform deck plates; 5. Inconel 718 Marine Fasteners: High-strength bolts, nuts, studs and screws for marine equipment assembly; 6. Inconel 718 Precision Machined Parts: Finished components such as valve stems, pump shafts, gear shafts, and instrument parts. |
| Why Choose Us (Emily PIPE) | 1. 20+ Years of Industry Experience: Professional manufacturer and exporter of nickel alloy and titanium alloy products, with rich experience in supplying materials for the global shipbuilding and offshore engineering industry.
2. Complete Marine Certifications: Our products have obtained certifications from major international classification societies (ABS, DNV, LR, BV, CCS), fully meeting the strict requirements of the shipbuilding industry. 3. Strict Quality Control System: We follow international standards throughout the entire process from raw material selection, production, inspection to packaging and delivery, ensuring each product meets marine-grade quality requirements. 4. Full Material Traceability: Establish a complete traceability system from raw material procurement to finished product delivery, all records are queryable and verifiable, meeting the quality management requirements of the shipbuilding industry. 5. Strong Customization Capability: Support both standard and customized specifications according to customers’ drawings, technical requirements and specific marine application environments. 6. Professional Technical Support: Experienced R&D and technical team, providing professional material selection guidance, processing parameters and welding technology support for marine applications. 7. One-Stop Service: Provide comprehensive solutions from material selection, customized processing to global logistics delivery, with reliable shipping channels and on-time delivery guarantee. |
| Inquiry Guidance Words | 1. If you need marine-grade Inconel 718 bar for your shipbuilding or offshore engineering project, please contact us with your specific requirements (size, quantity, technical standards, certification needs), and we will provide a detailed quotation within 12 hours.
2. For any questions about product performance, classification society certification, processing technology or delivery time, please send us an inquiry, our marine industry specialist will reply to you promptly. 3. Emily PIPE is your trusted partner for marine alloy materials. We provide high-quality products and professional services to help you build safer and more durable ships and offshore engineering equipment. |
| Supplementary Information | 1. Complete Test Reports: Provide marine-grade material test report (MTR), mechanical performance test report, corrosion resistance test report, non-destructive testing report and classification society certification documents.
2. Non-Destructive Testing: All products undergo 100% ultrasonic testing (UT), eddy current testing (ET) and surface inspection to ensure no internal defects. 3. Special Marine Packaging: Adopt anti-corrosion, moisture-proof and anti-collision packaging, with wooden pallets and protective sleeves to avoid damage during long-distance sea transportation. 4. Delivery Guarantee: Stable production capacity and global logistics network, supporting urgent orders and ensuring on-time delivery for shipbuilding projects. 5. After-Sales Service: Provide professional after-sales technical support, including welding guidance, machining parameters and on-site technical assistance. 6. Small Batch Support: Support small batch production for prototype development and equipment maintenance, meeting the diverse needs of customers. |