Inconel 718 Stud Bolt (UNS N07718) | ASTM F2281 / ASTM A1014 High Strength Bolting
inconel alloy 718 stud bolts are high-strength precipitation-hardened nickel-based alloy fasteners (UNS N07718) designed for extreme temperature and corrosive environments. They provide excellent tensile strength, creep resistance, and oxidation resistance, making them ideal for aerospace, oil & gas, and high-temperature industrial applications.
What is Inconel 718?
Inconel 718 (UNS N07718 / W.Nr. 2.4668) is a nickel-chromium superalloy known for:
- High strength at elevated temperatures
- Excellent corrosion resistance
- Good fatigue and creep resistance
- Stability from -253°C to 700°C
Key Features of Inconel 718 Stud Bolts
- Outstanding high-temperature strength up to 700°C
- Excellent resistance to oxidation and corrosion
- Superior creep and stress rupture properties
- Good resistance to chloride stress corrosion cracking
- Suitable for both cryogenic and high-temperature service
Standards & Specifications
- ASTM F2281 – Inconel 718 bolting
- ASTM A 1014 / A1014M – precipitation hardening bolting
- ASTM B637 – raw material (bars/forgings)
- UNS: N07718
Starting material typically complies with ASTM B637
Product Types Available
- Stud bolts (full thread / double-end)
- Hex bolts
- Threaded rods
- Heavy hex nuts
Thread Types:
- UNC / UNF / Metric
Size Range:
- Metric: M5 – M72
- Inch: 6# – 2″
- Custom sizes available
Chemical Composition (%)
| Element | Range |
|---|---|
| Ni | 50 – 55 |
| Cr | 17 – 21 |
| Mo | 2.8 – 3.3 |
| Nb | 4.75 – 5.5 |
| Fe | Balance |
👉 High Ni + Cr provides corrosion resistance and strength
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 965 MPa |
| Yield Strength | ≥ 550 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 363 HB |
Heat Treatment
Inconel 718 is a precipitation-hardened alloy:
- Solution treatment
- Aging process
Heat treatment enhances strength by stabilizing microstructure
NACE MR0175 Considerations
For oil & gas applications:
- Hardness must be ≤ 40 HRC
- Heat treatment adjusted to prevent SCC
Used in:
- Gate valves
- Choke stems
- Fasteners
- Tubing hangers
Applications
Inconel 718 stud bolts are widely used in:
- Gas turbine engines
- Aerospace components
- Oil & gas equipment
- Petrochemical plants
- Cryogenic systems
- Nuclear and power generation
👉 Suitable for extreme temperature + high stress environments
Inconel 718 vs Inconel 625
| Property | 718 | 625 |
|---|---|---|
| Strength | Higher | Lower |
| Creep resistance | Excellent | Moderate |
| Application | Structural / bolting | Corrosion-focused |
718 is often twice as strong as 625
Advantages of Inconel 718 Bolting
- High strength across wide temperature range
- Excellent fatigue resistance
- Good weldability
- Suitable for complex shapes and critical components
Ordering Information
Example:
- M20 × 200 mm Inconel 718 Stud Bolt (ASTM F2281)
Required Details:
- Size and length
- Thread type
- Quantity
- Standard (F2281 / A1014)
- Testing requirements
Quick Summary of Inconel 718 Bolt
- Material: Inconel 718 (UNS N07718)
- Type: High-strength stud bolt
- Temp range: -253°C to 700°C
- Feature: High strength + corrosion resistance
- Standard: ASTM F2281 / A1014
FAQ: Inconel 718 Stud Bolts
Q1: What is Inconel 718 used for?
High-temperature and high-strength applications such as turbines and aerospace components.
Q2: What makes Inconel 718 special?
Its precipitation hardening provides exceptional strength and creep resistance.
Q3: Is Inconel 718 suitable for sour service?
Yes, when hardness is controlled according to NACE requirements.
Q4: What is the difference between 718 and 625?
718 has higher strength, while 625 focuses more on corrosion resistance.
Packing Information:
1.Carton Size: 25*16*25CM
2.Wooden Pallet/Case Size: 110*90*80CM
3.Color Printed Box&Cartons can be made per customers’ desire.
How to order our inconel 718 stud bolt?
STUD BOLT, 1″ X 7″ LG, ALLOY 718,inconel 718 , PRECIPITATION HARDENED, ASTM B637 UNS N07718 STUD BOLT W/2 HEAVY HEX NUTS OF THE SAME MATERIAL ALLOY 718
Qty :100 sets
