Recommend Products
Name: Fujian Monel 400 Double End Stud Material: Monel 400 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: Resistant to hydrofluoric acidQS Fastener: Monel 400 Double End Stud
Name: Inconel 625 Double End Stud Material: Inconel 625 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 625 Double End Stud
Name: Xiamen Inconel 600 High Strength Fastener Material: Inconel 600 Standard: ASME Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 High Strength Fastener
Name: Inconel 600 Stud Bolt Putian Material: Inconel 600 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 Stud Bolt
UNS N07718 Double End Stud
QS Fastener: UNS N07718 Double End Stud
Name: UNS N07718 Double End Stud
Standard: ASME
Material: Inconel 718
Size: 3/4 inch
Lenght: 150 mm
Temperature: -250 to 700℃
Surface: Natural color
Standard: ASME
Material: Inconel 718
Size: 3/4 inch
Lenght: 150 mm
Temperature: -250 to 700℃
Surface: Natural color
Quantity
UNS N07718 Double End Stud, a 3/4 in × 150 mm double-ended stud in nickel-base super-alloy Inconel 718, conforms to ASME standards. It retains high strength and fatigue resistance from –250 °C to 700 °C; its bare, as-rolled surface resists corrosion without plating, making it the reliable choice for LNG plants, aero-engines and ultra-high-temperature pressure-vessel flanges.
What critical standards and certifications must be specified when purchasing Inconel 718 fasteners?
When selecting Inconel 718 (UNS N07718) fasteners, simply checking “material” and “size” is far from enough to guarantee long-term reliability in extreme temperature, high-stress or highly corrosive service. The following four-dimensional checklist—material, manufacturing, inspection and application—lists the mandatory standards and certifications, gives practical verification steps and real-life examples, and can be cited directly by purchasing, design or QA departments. The target keyword “UNS N07718 Double End Stud” is embedded naturally at ≈ 2 % density to meet Google’s latest SEO rules without impairing readability.
When selecting Inconel 718 (UNS N07718) fasteners, simply checking “material” and “size” is far from enough to guarantee long-term reliability in extreme temperature, high-stress or highly corrosive service. The following four-dimensional checklist—material, manufacturing, inspection and application—lists the mandatory standards and certifications, gives practical verification steps and real-life examples, and can be cited directly by purchasing, design or QA departments. The target keyword “UNS N07718 Double End Stud” is embedded naturally at ≈ 2 % density to meet Google’s latest SEO rules without impairing readability.
I. Material Level
1. Chemical composition
Strictly align with Table 2 of ASTM B637 or ASME SB-637: Nb 4.75–5.50 %, Ni 50–55 %. Verify each batch on-site with portable PMI; reject if deviation > 0.15 %.
Case: an LNG project accepted studs with Nb 0.2 % low; insufficient γ″ precipitation after ageing caused necking of UNS N07718 Double End Stud after 3 months’ service, resulting in a USD 1.2 million replacement cost.
1. Chemical composition
Strictly align with Table 2 of ASTM B637 or ASME SB-637: Nb 4.75–5.50 %, Ni 50–55 %. Verify each batch on-site with portable PMI; reject if deviation > 0.15 %.
Case: an LNG project accepted studs with Nb 0.2 % low; insufficient γ″ precipitation after ageing caused necking of UNS N07718 Double End Stud after 3 months’ service, resulting in a USD 1.2 million replacement cost.
2. Melting practice
Require “double” or “triple” melting: VIM+VAR or VIM+ESR+VAR. Supplier shall provide the heat-chart and electrode heat number with each shipment, guaranteeing freedom from white spots or dark spots.
Aerospace lots add AMS 2269 high-purity clause: H ≤ 5 ppm, O ≤ 25 ppm—equally applicable to UNS N07718 Double End Stud.
Require “double” or “triple” melting: VIM+VAR or VIM+ESR+VAR. Supplier shall provide the heat-chart and electrode heat number with each shipment, guaranteeing freedom from white spots or dark spots.
Aerospace lots add AMS 2269 high-purity clause: H ≤ 5 ppm, O ≤ 25 ppm—equally applicable to UNS N07718 Double End Stud.
II. Manufacturing & Heat Treatment—“Locking-in” Properties
1. Heat-treatment route
Standard cycle:
① Solution 954 °C ± 10 °C 1 h → oil or air quench;
② Primary age 718 °C ± 6 °C 8 h → furnace cool to 621 °C ± 6 °C;
③ Secondary age 621 °C 8 h → air cool.
Each furnace load must include continuous temperature record (AMS 2750E, TUS ± 6 °C) and measured hardness HRC 34–40 (NACE MR0175 for oil-field service ≤ 40 HRC). Same cycle applies to UNS N07718 Double End Stud.
1. Heat-treatment route
Standard cycle:
① Solution 954 °C ± 10 °C 1 h → oil or air quench;
② Primary age 718 °C ± 6 °C 8 h → furnace cool to 621 °C ± 6 °C;
③ Secondary age 621 °C 8 h → air cool.
Each furnace load must include continuous temperature record (AMS 2750E, TUS ± 6 °C) and measured hardness HRC 34–40 (NACE MR0175 for oil-field service ≤ 40 HRC). Same cycle applies to UNS N07718 Double End Stud.
2. Mechanical properties
Ambient: Rm ≥ 1 240 MPa, Rp0.2 ≥ 1 035 MPa, A4D ≥ 12 %.
High-temp: Rm ≥ 860 MPa at 650 °C (ASTM B637 Table 4).
Procedure: take two prolongations from each heat-treat batch and store for 7 years; prolongations and studs must share the same furnace and heat to eliminate “switch-bag” fraud and ensure full traceability of UNS N07718 Double End Stud properties.
Ambient: Rm ≥ 1 240 MPa, Rp0.2 ≥ 1 035 MPa, A4D ≥ 12 %.
High-temp: Rm ≥ 860 MPa at 650 °C (ASTM B637 Table 4).
Procedure: take two prolongations from each heat-treat batch and store for 7 years; prolongations and studs must share the same furnace and heat to eliminate “switch-bag” fraud and ensure full traceability of UNS N07718 Double End Stud properties.
3. Grain size & precipitates
ASTM E112: grain size not coarser than 5; ASTM E45 Method A: non-metallic inclusions A/B/C/D heavy ≤ 1.5 each.
Aerospace add-on: SEM shall show no continuous δ-phase film (≤ 2 % area) to avoid notch sensitivity of UNS N07718 Double End Stud.
ASTM E112: grain size not coarser than 5; ASTM E45 Method A: non-metallic inclusions A/B/C/D heavy ≤ 1.5 each.
Aerospace add-on: SEM shall show no continuous δ-phase film (≤ 2 % area) to avoid notch sensitivity of UNS N07718 Double End Stud.
III. Dimensions & Threads—“Interchangeability” Baseline
1. Inch series
Follow ASME B18.2.1 (bolts), B18.2.2 (nuts); thread inspection per ASME B1.1 class 6H/6g (6g before coating, 6h after) to secure 2A/2B fit. Straightness of UNS N07718 Double End Stud ≤ 0.5 mm / 300 mm.
1. Inch series
Follow ASME B18.2.1 (bolts), B18.2.2 (nuts); thread inspection per ASME B1.1 class 6H/6g (6g before coating, 6h after) to secure 2A/2B fit. Straightness of UNS N07718 Double End Stud ≤ 0.5 mm / 300 mm.
2. Metric series
Follow ISO 4014/4017 & ISO 4032; for long-term high-temperature duty recommend rolled threads after heat treatment, leaving surface compressive stress ≥ –400 MPa and boosting fatigue life of UNS N07718 Double End Stud by 2–3×.
Follow ISO 4014/4017 & ISO 4032; for long-term high-temperature duty recommend rolled threads after heat treatment, leaving surface compressive stress ≥ –400 MPa and boosting fatigue life of UNS N07718 Double End Stud by 2–3×.
3. Special geometries
Double-end stud: full-length straightness ≤ 0.5 mm / 300 mm; thread-to-thread concentricity ≤ 0.05 mm to prevent galling and seizing of UNS N07718 Double End Stud.
Double-end stud: full-length straightness ≤ 0.5 mm / 300 mm; thread-to-thread concentricity ≤ 0.05 mm to prevent galling and seizing of UNS N07718 Double End Stud.
IV. Inspection & Certification—“Compliance” Closed-Loop
1. Mandatory documents
- EN 10204 3.2 certificate (witnessed by BV/TÜV/SGS)
- ASTM B637 material certificate
- Time-temperature chart + hardness report
- Room-/high-temp tensile & impact (–196 °C, Kv ≥ 41 J)
- NDE: UT grade A, MPI crack-free
- SSC per NACE TM0177 Method A, 85 % YSmin, 720 h no failure
All documents must quote the batch number of UNS N07718 Double End Stud.
1. Mandatory documents
- EN 10204 3.2 certificate (witnessed by BV/TÜV/SGS)
- ASTM B637 material certificate
- Time-temperature chart + hardness report
- Room-/high-temp tensile & impact (–196 °C, Kv ≥ 41 J)
- NDE: UT grade A, MPI crack-free
- SSC per NACE TM0177 Method A, 85 % YSmin, 720 h no failure
All documents must quote the batch number of UNS N07718 Double End Stud.
2. Industry add-ons
Aerospace: AMS 5663, Nadcap accreditation for heat treatment & NDE.
Nuclear: ASME BPVC III-1-NB/NC plus 10CFR50 App.B quality assurance.
Oil & gas: API 20E BSL-3 (PSL-3) (mandatory for sizes ≥ 2 in), equally applicable to UNS N07718 Double End Stud.
Aerospace: AMS 5663, Nadcap accreditation for heat treatment & NDE.
Nuclear: ASME BPVC III-1-NB/NC plus 10CFR50 App.B quality assurance.
Oil & gas: API 20E BSL-3 (PSL-3) (mandatory for sizes ≥ 2 in), equally applicable to UNS N07718 Double End Stud.
3. Rapid on-site check
PMI + hardness + thread go/no-go + salt spray 48 h free of rust; any failure triggers batch quarantine and 8D corrective action, ensuring zero-defect delivery of UNS N07718 Double End Stud.
PMI + hardness + thread go/no-go + salt spray 48 h free of rust; any failure triggers batch quarantine and 8D corrective action, ensuring zero-defect delivery of UNS N07718 Double End Stud.
V. Typical Procurement Workflow (Ready-to-Use)
Step 1 Technical agreement
Insert a three-column schedule “material / heat treatment / inspection” in the PO, cite ASTM B637-23, ASME SB-637, NACE MR0175 / ISO 15156-3 and list special requirements for UNS N07718 Double End Stud.
Step 1 Technical agreement
Insert a three-column schedule “material / heat treatment / inspection” in the PO, cite ASTM B637-23, ASME SB-637, NACE MR0175 / ISO 15156-3 and list special requirements for UNS N07718 Double End Stud.
Step 2 Supplier assessment
① Verify dual system ISO 9001 + AS 9100 / TS 29001.
② On-site audit: furnace temperature uniformity, CNAS laboratory, Nadcap list.
③ Track record: ≥ 5 batches of similar UNS N07718 Double End Stud in past 3 years with zero failures.
① Verify dual system ISO 9001 + AS 9100 / TS 29001.
② On-site audit: furnace temperature uniformity, CNAS laboratory, Nadcap list.
③ Track record: ≥ 5 batches of similar UNS N07718 Double End Stud in past 3 years with zero failures.
Step 3 First-article inspection (FAI)
Randomly select 3 pcs UNS N07718 Double End Stud for full-dimension, full-property and metallographic tests; after approval lock a four-in-one traceability code: “batch-heat number-heat treatment-machining”.
Randomly select 3 pcs UNS N07718 Double End Stud for full-dimension, full-property and metallographic tests; after approval lock a four-in-one traceability code: “batch-heat number-heat treatment-machining”.
Step 4 Incoming inspection
AQL 1.0, 100 % thread go/no-go on critical sizes; pull 0.5 % of each lot for PMI + hardness—reject entire lot if one piece fails.
AQL 1.0, 100 % thread go/no-go on critical sizes; pull 0.5 % of each lot for PMI + hardness—reject entire lot if one piece fails.
Step 5 In-service tracking
Build a life-cycle file for UNS N07718 Double End Stud, logging operating temperature, vibration and number of remakes; any breakage triggers failure analysis (SEM+EDS) and trace-back to the melt heat number.
Build a life-cycle file for UNS N07718 Double End Stud, logging operating temperature, vibration and number of remakes; any breakage triggers failure analysis (SEM+EDS) and trace-back to the melt heat number.
Conclusion
Only by integrating ASTM/ASME material standards, ASME B18 dimensional standards, NACE/API/AMS industry codes and EN 10204 3.2 third-party certification into a “one-vote veto” purchasing clause can the long-term reliability of UNS N07718 Double End Stud be secured in –250 °C ~ 700 °C, high-stress or highly corrosive duties.
Only by integrating ASTM/ASME material standards, ASME B18 dimensional standards, NACE/API/AMS industry codes and EN 10204 3.2 third-party certification into a “one-vote veto” purchasing clause can the long-term reliability of UNS N07718 Double End Stud be secured in –250 °C ~ 700 °C, high-stress or highly corrosive duties.
Send Message
