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Inconel 718 Hexagon Socket Head Bolt
QS Fastener: Inconel 718 Hexagon Socket Head Bolt
Name: Inconel 718 Hexagon Socket Head Bolt
Material: Inconel 718, ASTM B637 UNS N07718
Application: Gas Engine Turbines
Standard: DIN 912
Size: M33
Length: 90mm
Feature: With Excellent Creep and Stress Rupture Strength
Price: EXW USD 29.9 - 39.9/ pcs
MOQ: 10 pcs
Customization: yes
Delivery time: 7-15 Day
Material: Inconel 718, ASTM B637 UNS N07718
Application: Gas Engine Turbines
Standard: DIN 912
Size: M33
Length: 90mm
Feature: With Excellent Creep and Stress Rupture Strength
Price: EXW USD 29.9 - 39.9/ pcs
MOQ: 10 pcs
Customization: yes
Delivery time: 7-15 Day
Quantity
The Inconel 718 Hexagon Socket Head Bolt is a high-performance fastening solution engineered for extreme service conditions in gas turbines and aerospace applications. Manufactured from ASTM B637 UNS N07718 nickel-chromium superalloy, this DIN 912-compliant bolt (M33×90mm) delivers reliable clamping force under sustained high-temperature exposure. The hex socket drive design enables high-torque installation in confined spaces while maintaining joint integrity at operating temperatures up to 700°C .
Key Specifications:
- Material: Inconel 718 (UNS N07718), ASTM B637
- Standard: DIN 912
- Size: M33 × 90mm
- Application: Gas turbine engines, aerospace assemblies
- Price: EXW USD 29.9 – 39.9/pc
- MOQ: 10 pieces
- Lead Time: 7–15 days
- Customization: Available upon request
- Material: Inconel 718 (UNS N07718), ASTM B637
- Standard: DIN 912
- Size: M33 × 90mm
- Application: Gas turbine engines, aerospace assemblies
- Price: EXW USD 29.9 – 39.9/pc
- MOQ: 10 pieces
- Lead Time: 7–15 days
- Customization: Available upon request
Technical Performance Data
Microstructural Stability
The precipitation-hardened Inconel 718 alloy derives its long-term reliability from a carefully engineered microstructure. The γ"strengthening phase exhibits exceptional thermal stability: after 1,000 hours of aging at 650°C, γ"precipitate growth is limited from 20nm to 25nm, retaining over 95% of original tensile strength. Grain boundary engineering—incorporating 3–5% δ phase in synergy with Cr₂₃C₆ carbides—effectively inhibits grain boundary migration, enabling a creep rupture life exceeding 3,000 hours under 345 MPa at 700°C.
High-Temperature Validation
650°C / 1,000-Hour Exposure:
- Yield strength reduction: only 5% (1,275 MPa → 1,210 MPa)
- γ"phase volume fraction remains >90% as verified by TEM analysis
650°C / 1,000-Hour Exposure:
- Yield strength reduction: only 5% (1,275 MPa → 1,210 MPa)
- γ"phase volume fraction remains >90% as verified by TEM analysis
700°C Extreme Testing:
- Oxidation weight gain: 0.3 mg/cm² (attributed to Cr₂O₃ protective scale formation)
- δ phase content increases from 4% to 7% after 5,000 hours
- Oxidation weight gain: 0.3 mg/cm² (attributed to Cr₂O₃ protective scale formation)
- δ phase content increases from 4% to 7% after 5,000 hours
Critical Process Controls
Quality assurance begins with material processing:
- Double Melting: VAR + ESR refines Nb segregation index from 1.5 to 1.1
- Heat Treatment: 950–980°C solution annealing followed by dual aging for optimal δ phase distribution
- Purity: Sulfur content ≤ 0.002% (approaching nuclear-grade 718A specification)
Quality assurance begins with material processing:
- Double Melting: VAR + ESR refines Nb segregation index from 1.5 to 1.1
- Heat Treatment: 950–980°C solution annealing followed by dual aging for optimal δ phase distribution
- Purity: Sulfur content ≤ 0.002% (approaching nuclear-grade 718A specification)
Industrial Performance Track Record
Inconel 718 socket head bolts are validated across demanding sectors:
| Application | Performance Metric |
| Aircraft engines | 90% impact toughness retention after 30,000 hours at 650°C |
| Nuclear reactors | Only 10% toughness reduction (34J → 30J) after 15-year service |
| Deep-sea drilling | Zero stress corrosion cracking failures in H₂S/CO₂ environments over 10 years |
Why Choose This Inconel 718 Hexagon Socket Head Bolt?
- Service Life: 300% longer than conventional alloy steel bolts in high-temperature applications
- Strength Retention: Maintains >85% of rated strength at 700°C
- Certifications: Complies with ASME Section III and NACE MR0175
- Flexibility: Custom heat treatment options available (direct aging or overaging)
- Service Life: 300% longer than conventional alloy steel bolts in high-temperature applications
- Strength Retention: Maintains >85% of rated strength at 700°C
- Certifications: Complies with ASME Section III and NACE MR0175
- Flexibility: Custom heat treatment options available (direct aging or overaging)
Frequently Asked Questions
Q1: What is the maximum operating temperature for Inconel 718 socket head bolts?
A: Inconel 718 fasteners are rated for continuous service up to 700°C (1,300°F), with verified performance in creep and oxidation resistance at this temperature threshold .
Q2: Does this bolt meet DIN 912 dimensional standards?
A: Yes. The M33×90mm hexagon socket head bolt is manufactured in full compliance with DIN 912 specifications, ensuring interchangeability with standard socket head cap screws.
A: Yes. The M33×90mm hexagon socket head bolt is manufactured in full compliance with DIN 912 specifications, ensuring interchangeability with standard socket head cap screws.
Q3: What is the minimum order quantity for this product?
A: The MOQ is 10 pieces, with flexible pricing for larger volume orders. Custom sizes and heat treatments are available upon request.
A: The MOQ is 10 pieces, with flexible pricing for larger volume orders. Custom sizes and heat treatments are available upon request.
Q4: How does Inconel 718 compare to standard alloy steel bolts in gas turbines?
A: Inconel 718 provides approximately 300% longer service life at elevated temperatures, maintaining yield strength above 1,200 MPa at 650°C where conventional steels would experience rapid degradation .
A: Inconel 718 provides approximately 300% longer service life at elevated temperatures, maintaining yield strength above 1,200 MPa at 650°C where conventional steels would experience rapid degradation .
Q5: Is this bolt suitable for sour gas (H₂S) environments?
A: Yes. The product is NACE MR0175 compliant and has demonstrated zero stress corrosion cracking failures after 10 years of service in H₂S/CO₂ deep-sea drilling applications.
A: Yes. The product is NACE MR0175 compliant and has demonstrated zero stress corrosion cracking failures after 10 years of service in H₂S/CO₂ deep-sea drilling applications.
Q6: What heat treatment options are available?
A: Standard heat treatment includes solution annealing at 950–980°C plus dual aging. Customized direct aging or overaging treatments can be specified based on application requirements.
A: Standard heat treatment includes solution annealing at 950–980°C plus dual aging. Customized direct aging or overaging treatments can be specified based on application requirements.
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