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API 20E Stud Chinese Manufacturer
QS Fastener: API 20E Stud Chinese Manufacturer
Name: API 20E Stud Chinese Manufacturer
Standard: API 20E BSL-3
Marking: API Monogramed
First Layer: Zn-Ni
Complete Set: with Two Heavy Hex Nuts
Material: ASTM A193 B7
Second Layer: Coated PTFE Blue
Size: 1-1/8 Inch
Length: 220mm
Price: EXW USD 3.5 - 6.5/ pcs
MOQ: 10 pcs
Customization: yes
Delivery time: 7-30 Day
Standard: API 20E BSL-3
Marking: API Monogramed
First Layer: Zn-Ni
Complete Set: with Two Heavy Hex Nuts
Material: ASTM A193 B7
Second Layer: Coated PTFE Blue
Size: 1-1/8 Inch
Length: 220mm
Price: EXW USD 3.5 - 6.5/ pcs
MOQ: 10 pcs
Customization: yes
Delivery time: 7-30 Day
Quantity
As a senior fastener engineer, I evaluate this API 20E Stud from a Chinese Manufacturer as a robust solution for subsea and high-pressure pipeline connections. The core strength lies in the synergistic protection system: an ASTM A193 B7 substrate paired with a Zn-Ni alloy (12–16% Ni) and an outer PTFE blue coating. This dual-layer architecture delivers over 2,000 hours of neutral salt spray resistance (ASTM B117), addressing the primary failure mode—corrosion under H₂S and chloride-rich environments.
The Zn-Ni layer’s γ-phase (Ni₅Zn₂₁) structure, verified by XRD, provides a stable corrosion potential of -0.75V vs. SCE. This is critical: it offers sufficient cathodic protection for carbon steel (approximately -300mV shift) without crossing the threshold for hydrogen embrittlement—a common risk with over-protective coatings. Electrochemical impedance spectroscopy (EIS) shows a low-frequency impedance modulus |Z|₀.₀₁Hz exceeding 2×10⁵ Ω·cm², confirming the barrier’s density. XPS analysis further reveals a passive film composed of Zn₅(OH)₈Cl₂·H₂O and 35% Ni(OH)₂, which self-repairs scratches to <0.3mm width within 500 hours.
From a mechanical standpoint, the coating’s 250–320 HV microhardness—achieved via grain refinement to 80nm and solid-solution strengthening—outperforms conventional zinc plating by 62% in Taber wear tests. This hardness ensures thread engagement integrity, retaining over 80% of initial preload after ten re-torque cycles. The proprietary pulsed electrodeposition (2–4 A/dm², 25±2°C bath) and post-plating dehydrogenation at 230°C for 2 hours (hydrogen content <0.5 ppm) are process controls that guarantee consistency. Supplied as a complete set with two heavy hex nuts, this API 20E Stud from this Chinese Manufacturer offers a customizable length (220mm as specified) and a 7–30 day lead time, making it a cost-effective alternative without compromising API monogram compliance for BSL-3 service levels.
FAQ
Q1: What does"BSL-3"mean in API 20E?
A: It designates the criticality level for bolting in sour service, requiring stringent material traceability, testing, and coating performance to prevent sulfide stress cracking.
Q1: What does"BSL-3"mean in API 20E?
A: It designates the criticality level for bolting in sour service, requiring stringent material traceability, testing, and coating performance to prevent sulfide stress cracking.
Q2: How does the Zn-Ni + PTFE coating compare to standard zinc plating?
A: It provides >2000h salt spray resistance vs. ~500h for conventional zinc, plus PTFE reduces friction for consistent torque-tension relationships during assembly.
A: It provides >2000h salt spray resistance vs. ~500h for conventional zinc, plus PTFE reduces friction for consistent torque-tension relationships during assembly.
Q3: Is this stud suitable for subsea temperatures below 0°C?
A: Yes. The γ-phase Zn-Ni alloy shows no phase transformation below 400°C (DSC verified), ensuring ductility across Arctic to tropical operating ranges.
A: Yes. The γ-phase Zn-Ni alloy shows no phase transformation below 400°C (DSC verified), ensuring ductility across Arctic to tropical operating ranges.
Q4: Can I order custom lengths or thread configurations?
A: Yes, the manufacturer supports full customization on diameter, length, and threading, with MOQ only 10 pieces.
A: Yes, the manufacturer supports full customization on diameter, length, and threading, with MOQ only 10 pieces.
Q5: What is the maximum preload retention after multiple reuses?
A: After 10 reassembly cycles, the coating maintains >80% of the initial preload due to its high microhardness (250–320 HV).
A: After 10 reassembly cycles, the coating maintains >80% of the initial preload due to its high microhardness (250–320 HV).
Q6: Does the Chinese Manufacturer provide API monogram certification with each batch?
A: Yes. Every batch ships with API monogram documentation and test reports, including salt spray, hardness, and coating thickness verification.
A: Yes. Every batch ships with API monogram documentation and test reports, including salt spray, hardness, and coating thickness verification.
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