High Strength Inconel 718 Nickel Chromium Superalloy with Exceptional Weldability and Temperature Resistance up to 1300°F
Price:
Negotiable (Request a Quote)
MOQ:
100kg
Delivery Time:
15-25days
Brand:
Baosteel，TISCO
Product Description
High Strength Inconel 718 Precipitation Hardenable Nickel Chromium Superalloy
Inconel 718 is a precipitation-hardenable nickel-chromium superalloy that delivers exceptional strength from -423°F (-253°C) up to 1300°F (700°C). Its unique combination of high tensile strength, fatigue resistance, creep rupture properties, and excellent weldability sets it apart from other high-strength superalloys.
Unlike many precipitation-hardened alloys that are prone to post-weld cracking, Inconel 718 exhibits outstanding weldability - even in complex, thin-walled fabrications. This makes it the #1 choice for aerospace gas turbine engines, liquid-fueled rockets, high-temperature fasteners, and critical oil & gas downhole components.
Chemical Composition
The unique age-hardenable characteristics come from a precise balance of niobium (columbium), titanium, and aluminum, which form strengthening precipitates (gamma double-prime and gamma prime) during heat treatment.
| Element | Content (%) | Role |
|---|---|---|
| Nickel (Ni) | 50.0 - 55.0 | Base element - provides corrosion resistance & austenitic stability |
| Chromium (Cr) | 17.0 - 21.0 | Oxidation resistance & protection against sulfur compounds |
| Iron (Fe) | Balance (Rem) | Provides cost-effective stability & structural integrity |
| Niobium + Tantalum (Nb+Ta) | 4.75 - 5.50 | Primary strengthening element (gamma double-prime precipitate) |
| Molybdenum (Mo) | 2.80 - 3.30 | Pitting resistance & solid-solution strengthening |
| Titanium (Ti) | 0.65 - 1.15 | Secondary strengthener (gamma prime precipitate) |
| Aluminum (Al) | 0.20 - 0.80 | Secondary strengthener (gamma prime precipitate) |
| Cobalt (Co) | 1.00 max | Limited for nuclear compatibility |
| Carbon (C) | 0.08 max | Controlled for carbide stability |
| Manganese (Mn) | 0.35 max | Trace element |
| Silicon (Si) | 0.35 max | Trace element |
| Phosphorus (P) | 0.015 max | Controlled for ductility |
| Sulfur (S) | 0.015 max | Controlled for hot workability |
| Boron (B) | 0.006 max | Grain boundary strengthener |
| Copper (Cu) | 0.30 max | Trace element |
Niobium is also referred to as Columbium (Cb) in older specifications. The combined Nb+Ta content is critical for precipitation hardening.
Typical Mechanical Properties
Inconel 718 is supplied in two main conditions: Solution Annealed (for fabrication) and Aged (precipitation-hardened for maximum strength). The aged condition delivers the alloy's signature high-temperature performance.
| Product Form | Condition | Tensile Strength (KSI / MPa) | Yield Strength 0.2% Offset (KSI / MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|---|
| Sheet (AMS 5596) | Solution Annealed | 140 KSI (965 MPa) | 80 KSI (552 MPa) | 30 | 102 HRB max |
| Sheet (AMS 5596) | Aged | 180 KSI (1241 MPa) | 150 KSI (1034 MPa) | 12 | ≥36 HRC |
| Sheet (AMS 5597) | Solution Annealed | 140 KSI (965 MPa) | 75 KSI (517 MPa) | 30 | ≤25 HRC |
| Sheet (AMS 5597) | Aged | 180 KSI (1241 MPa) | 150 KSI (1034 MPa) | 15 | ≥38 HRC |
| Bar / Rod (ASTM B637) | Solution Annealed + Aged | 185 KSI min (1276 MPa) | 150 KSI min (1034 MPa) | 12 min | 36 HRC min |
Key Performance Notes
- At 1200 °F (649°C): Retains approximately 70% of room temperature yield strength.
- Creep Rupture: Excellent resistance to creep deformation up to 1300°F (700°C).
- Fatigue Strength: Superior to most other superalloys in the high-cycle fatigue regime.
- Cryogenic Performance: Elongation can exceed 20% at -320°F (-196°C) with no ductile-to-brittle transition.
Available Products & Specifications
We supply Inconel 718 in all standard mill forms, cut to size, with full traceability to AMS, ASTM, and ASME standards. Custom dimensions and special heat treatments are available upon request.
| Product Form | Size Range | Key Specifications |
|---|---|---|
| Round Bar / Rod | Dia: 6mm - 300mm (0.25" - 12") | ASTM B637, ASME SB637, AMS 5662, AMS 5663, AMS 5664, ISO 9723, DIN 17752 |
| Wire | Dia: 0.1mm - 12mm | AMS 5832, ISO 9724, DIN 17753 |
| Plate / Sheet / Strip | Thk: 0.5mm - 100mm | ASTM B670, ASTM B906, AMS 5596, AMS 5597, AMS 5598, AMS 5862, ISO 6208, DIN 17750 |
| Seamless Pipe / Tube | OD: 6mm - 219mm | SAE AMS 5589, SAE AMS 5590, ASTM B983 |
| Welded Pipe / Tube | OD: up to 914mm | SAE AMS 5590 (welded annealed), ASTM B983 |
| Fittings (Flanges, Elbows, Tees) | All schedules | ASTM B366, ASME SB366 |
| Forgings (Rings, Discs, Blocks) | Custom sizes | ASTM B637, ASME SB637, AMS 5663, ISO 9725, DIN 17754 |
| Fastener Stock | Custom | ASTM B637 (Condition A or Aged), AMS 5662 |
Additional Specifications Met
- European: VdTÜV 499, EN 10095, BS 3072/3073/3076 NA18
- Aerospace: Rolls-Royce MSRR, GE, Pratt & Whitney (contact for specific PWA or SPS numbers)
- Oil & Gas: NACE MR-01-75 (sour gas service - certified on request)
Welding Products Available
- Filler Wire: ERNiCrFe-2 or ERNiCrMo-10 (per AWS A5.14)
- Welding Electrode: ENiCrFe-2 or ENiCrMo-10 (per AWS A5.11)
Note: Inconel 718's exceptional weldability makes it suitable for welding to itself and to dissimilar alloys like stainless steels using appropriate filler metals.
Why Choose Our Inconel 718?
- Certified Quality: Every shipment includes full traceability and an EN 10204 Type 3.1 Mill Test Certificate (MTC) - available with AMS, ASTM, or ASME compliance.
- Extensive Inventory: Large stock of bars (round & flat), sheet, plate, and pipe in a range of sizes for immediate dispatch.
- Precision Processing: In-house cutting (shear, plasma, waterjet, cold saw) and machining (turning, milling) to your exact dimensions.
- Technical Expertise: Our metallurgists can assist with heat treatment specifications (solution annealed, aged, or double-aged) and material selection.
- Competitive Pricing: Direct mill access offers cost-effective solutions for both prototypes and production volumes.
- Global Logistics: Expert export packaging ensures safe, delivered-duty-paid (DDP) service worldwide.
Frequently Asked Questions (FAQ)
Q: What is the difference between Inconel 625 and Inconel 718?
A: Inconel 625 is solid-solution strengthened - high strength as-welded, excellent corrosion resistance, but lower high-temperature strength than 718. Inconel 718 is precipitation-hardened - significantly higher yield and creep strength up to 1300°F (700°C), but requires aging heat treatment. For aerospace rotating parts and high-temperature fasteners, choose 718. For seawater and chemical processing, choose 625.
Q: Can Inconel 718 be welded in the aged condition?
A: Typically, 718 is welded in the solution annealed condition (Condition A) and then aged after welding to restore full strength. However, it can also be welded in the aged condition with proper procedures (specifically for repair). Contact us for weld procedure development support.
Q: What heat treatment conditions are available?
A: We supply:
- Solution Annealed (Condition A): Ready for fabrication.
- Solution Annealed + Aged (Condition B): Fully precipitation-hardened, maximum strength.
- Solution Annealed + Double Aged: Optimized for certain stress-rupture requirements (per AMS 5663/5664).
Q: Do you provide third-party inspection?
A: Yes. We can arrange SGS, TÜV, BV, or Lloyd's inspection at the buyer's cost, including witness testing and dimension checks.
Q: What is the maximum temperature for continuous service?
A: For load-bearing applications, continuous service to 1300 °F (700°C). For intermittent service, excursions to 1400°F (760°C) are possible.
Contact Us for a Competitive Quote
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Company
Shanxi Zhongcheng Metal Co., Ltd.
Location
Room 2, No. 221 Tianzhang Avenue, Fengdong New City, Xi'an, Shaanxi Province
Contact Person
Zhongcheng Metal