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API 20F Bolting China Supplier
QS Fastener: API 20F Bolting China Supplier
Name: API 20F Bolting China Supplier
Dimension: M36
Length: 360mm
Type: Full Thread Stud
Standard: API 20F
Material: UNS N07718
Technical: Maximum Hardness Limits Shall Be in Accordance with ANSI/NACE MR0175
Dimension: M36
Length: 360mm
Type: Full Thread Stud
Standard: API 20F
Material: UNS N07718
Technical: Maximum Hardness Limits Shall Be in Accordance with ANSI/NACE MR0175
Quantity
This API 20F Bolting consists of fully threaded studs manufactured from UNS N07718, a nickel-based superalloy specifically selected for sour-service and high-temperature applications. As a recognized API 20F Bolting China Supplier, we ensure each batch meets the stringent metallurgical and dimensional requirements of API 20F, with hardness strictly controlled to ANSI/NACE MR0175 limits for reliable performance in H₂S‑bearing environments.
The outstanding mechanical properties of UNS N07718 arise primarily from the γ″ (Ni₃Nb) strengthening phase, precipitated during age-hardening. This body-centered tetragonal (D022) structure maintains excellent coherency with the matrix, effectively hindering dislocation motion. Compared with A286—which relies on γ′ (Ni₃Ti) precipitation—N07718 offers two decisive advantages for API 20F Corrosion Resistant Bolting: (1) superior thermal stability, with negligible γ″ coarsening below 650°C, while A286’s γ′ agglomerates rapidly above 600°C; and (2) a higher volume fraction of strengthening phase (15–20% vs. 8–12%), translating into consistently higher yield and tensile strengths.
In the aged condition, N07718 delivers a yield strength of 1030 MPa and tensile strength of 1240 MPa, retaining about 75% of its yield strength at 700°C—compared to only 50% for A286. This temperature resistance is reinforced by niobium solid-solution strengthening and molybdenum segregation at grain boundaries, which together inhibit high-temperature grain-boundary sliding. ASTM E139 creep data show that after 1000 hours at 650°C, N07718 loses merely 8% of its yield strength, versus 25% for A286; its creep rate at 600–700°C is an order of magnitude lower, thanks to the high coarsening activation energy of γ″ (280 kJ/mol) and the pinning effect of dispersed MC‑type carbides.
For end users, these characteristics translate directly into field reliability. In oil drilling wellhead equipment exposed to H₂S and temperatures around 600°C, API 20F‑compliant N07718 studs demonstrate three times the stress-corrosion cracking life of A286. Whether for subsea Christmas trees, high‑pressure flanges, or turbine casings, choosing a qualified API 20F Bolting China Supplier ensures you receive material that meets not only the dimensional and hardness specs but also the long‑term creep and relaxation resistance essential for critical bolted connections. With proven performance in both aerospace turbine bolts and severe petroleum service, UNS N07718 remains the benchmark alloy for API 20F Corrosion Resistant Bolting above 650°C—offering a robust balance of strength, stability, and sour‑service durability that few alternatives can match.
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