Hunan Dinghan New Material Technology Co., LTD
| Payment Terms | T/T |
| Supply Ability | Negotiable |
| Delivery Time | (Sample order) 7 days |
| Packaging Details | According to customers' requests |
| Product Name | UNS N07718 Alloy 718 Seamless Pipe Hard-deformable Nickel-base Alloy Hot-extruded Seamless Tube |
| Material | Nickel based Alloys |
| Grade | Alloy 718 |
| Size | Customized |
| Surface | As per your demands |
| Application Areas | Aerospace,Thermal Processing,Oil & Gas,Marine |
| Brand Name | DINGSCO |
| Model Number | According to customers' requirements |
| Certification | ISO 9001:2015,PED 2014/68/EU,API 6A,API-20B,TSG,NORSOK |
| Place of Origin | China |
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Product Specification
| Payment Terms | T/T | Supply Ability | Negotiable |
| Delivery Time | (Sample order) 7 days | Packaging Details | According to customers' requests |
| Product Name | UNS N07718 Alloy 718 Seamless Pipe Hard-deformable Nickel-base Alloy Hot-extruded Seamless Tube | Material | Nickel based Alloys |
| Grade | Alloy 718 | Size | Customized |
| Surface | As per your demands | Application Areas | Aerospace,Thermal Processing,Oil & Gas,Marine |
| Brand Name | DINGSCO | Model Number | According to customers' requirements |
| Certification | ISO 9001:2015,PED 2014/68/EU,API 6A,API-20B,TSG,NORSOK | Place of Origin | China |
| High Light | Customized 718 Alloy Seamless Pipe ，N07718 Alloy 718 Seamless Pipe ，Customized N07718 Alloy Seamless Pipe | ||
UNS N07718 Alloy 718 Seamless Pipe Hard-deformable Nickel-base Alloy Hot-extruded Seamless Tube
Material Standard: ASTM B637 / ASME SB637 / AMS 5596 (Aerospace)
UNS Designation: N07718
Common Names: Inconel 718, Alloy 718, Nickel-Chromium Superalloy
| Element | Content (%) | Role |
|---|---|---|
| Nickel (Ni) | 50-55% | Base metal, provides corrosion resistance & high-temperature strength |
| Chromium (Cr) | 17-21% | Oxidation/corrosion resistance |
| Iron (Fe) | Balance | Cost-effective strengthening |
| Niobium (Nb) + Tantalum (Ta) | 4.75-5.5% | Forms γ″ phase (primary strengthening via precipitation hardening) |
| Molybdenum (Mo) | 2.8-3.3% | Enhances creep resistance |
| Titanium (Ti) | 0.65-1.15% | Forms γ′ phase (secondary strengthening) |
| Aluminum (Al) | 0.2-0.8% | Stabilizes γ′ phase |
| Carbon (C) | ≤0.08% | Controls carbide formation |
Seamless Pipe Production:
Hot Extrusion: Billet heated to ~1100°C and extruded through a die to form hollow shells.
Cold Drawing/Pilgering: Further precision sizing for tight tolerances (OD ±0.1mm, WT ±5%).
Solution Annealing: 955-1010°C + rapid cooling (water or air) to dissolve precipitates.
Aging Treatment: Dual-stage (720°C ±10°C for 8h → furnace cool to 620°C ±10°C for 8h) to precipitate γ″/γ′ phases.
| Property | Value (Room Temp) | High-Temp Performance |
|---|---|---|
| Tensile Strength | ≥1035 MPa (150 ksi) | 690 MPa (100 ksi) @ 650°C |
| Yield Strength (0.2% offset) | ≥725 MPa (105 ksi) | 550 MPa (80 ksi) @ 650°C |
| Elongation | ≥12% | Maintains >8% @ 540°C |
| Hardness | 30-40 HRC | — |
| Corrosion Resistance | Excellent in: | Poor in: |
| - Seawater | - Hydrofluoric acid | |
| - H₂S-containing oil/gas environments | - Hot concentrated sulfuric acid |
Aerospace: Turbine blades, combustion chambers (up to 700°C).
Oil & Gas: Downhole tubing, subsea risers (resists sulfide stress cracking).
Nuclear: Reactor coolant pipes (neutron irradiation resistance).
Chemical Processing: Valves, reactors handling chlorides/acidic media.
5. Advantages Over Alternatives
vs. Alloy 625: Higher strength (but lower ductility) due to γ″ hardening.
vs. Stainless Steel (e.g., 316L): 3x higher yield strength at 500°C.
Weldability: Unlike many superalloys, Alloy 718 can be welded via TIG/GTAW without post-weld cracking (low Al/Ti content).
Certifications: NACE MR0175 (sulfide stress cracking resistant), PED 2014/68/EU.
Testing:
NDT: 100% ultrasonic testing (ASTM E213) for defects.
PMI: XRF verification of composition.
Mechanical Tests: Per ASTM E8/E21.
More grades:
Company Details
Business Type:
Manufacturer,Exporter,Seller
Year Established:
1998
Total Annual:
70 million-100 million
Employee Number:
50~60
Ecer Certification：
Verified Supplier
Hunan Dinghan New Material Technology Co.,Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications. We have complete advanced technology facilities to produc... Hunan Dinghan New Material Technology Co.,Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications. We have complete advanced technology facilities to produc...
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