Gr5 Gr2 Titanium Threaded Stud Bolt Full Half Thread For Petrochemical Flange Pre‑load
Опубликовано Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd от 2026-10-25
1. Product Identity
Manufactured in Shaanxi Baoji China, titanium threaded stud bolt (stud) is designed for flange bolted‑joint assembly, different from ordinary hex‑head bolts. Available in full‑thread and half‑thread configuration. Produced from hot‑forged titanium bar followed by precision thread rolling. Core advantage lies in maintaining stable pre‑load under temperature fluctuation and chloride‑containing corrosive atmosphere, lowering risk of stress‑corrosion cracking. Widely adopted for petrochemical equipment flanges, salt‑chemical pipeline joints, high‑corrosion reaction vessel manhole connections. We provide standard size studs and custom drawing‑based non‑standard studs, matched titanium nuts are available as complete set.
2. Core Technical Parameters
-
Material Grade: Gr2 commercially pure titanium, Gr5 Ti‑6Al‑4V titanium alloy
-
Thread Type: Full‑thread stud bolt, half‑thread stud bolt
-
Manufacturing Process: Hot forging blank, turning, thread rolling, surface passivation
-
Key Feature: Stable pre‑load under thermal‑cycle; resist chloride‑induced stress‑corrosion cracking
-
Supporting parts: Matching titanium hexagon nuts can be supplied as complete assembly set
-
Application: Petrochemical corrosive‑medium flange, salt‑chemical pipeline, reaction‑vessel manhole connection
-
Origin: Shaanxi Baoji, China
3. Chemical Composition (wt%, ASTM Standard)
|
Grade
|
Ti
|
Al
|
V
|
Fe
|
O
|
C
|
N
|
H
|
|
Gr2
|
Balance
|
—
|
—
|
≤0.30
|
≤0.25
|
≤0.08
|
≤0.03
|
≤0.015
|
|
Gr5 Ti‑6Al‑4V
|
Balance
|
5.5‑6.8
|
3.5‑4.5
|
≤0.40
|
≤0.20
|
≤0.08
|
≤0.05
|
≤0.015
|
4. Mechanical & Corrosion Performance
-
Gr2 Tensile ≥345 MPa; Yield ≥275 MPa; Elongation ≥20%
-
Gr5 Tensile ≥895 MPa; Yield ≥828 MPa; Elongation ≥10%
-
Corrosion performance: Excellent resistance against chloride‑mediated stress‑corrosion cracking which frequently fails carbon‑steel and some alloy‑steel studs in brine‑containing working environment.
-
Thermal‑cycle performance: Low stress relaxation rate under repeated heating‑cooling fluctuation; help flange joint keep sealing performance, reduce risk of medium leakage.
-
Processing note: Thread rolling process is preferred rather than cutting thread for better thread‑root fatigue performance; avoid sharp notch which becomes stress‑concentration origin.
5. Full Size Range
-
Thread specification: Metric thread M6‑M64; custom UNC / UN thread upon drawing requirement
-
Style options: Full‑thread stud, half‑thread stud with un‑threaded shank section
-
Effective length: Custom overall length according to flange thickness and gasket assembly dimension
-
Custom options: Special pitch, end chamfer, anti‑seize surface treatment, non‑standard transition shank.
6. Surface Treatment Options
-
As‑machined natural titanium surface: For general‑purpose internal equipment assembly.
-
Passivation treatment: Improve atmospheric and chloride corrosion resistance for outdoor flange joints.
-
Dry‑film lubricant coating: Reduce galling risk for titanium‑to‑titanium thread matching during torque tightening.
7. Material Comparison: Titanium Stud Bolt vs Alloy‑Steel Stud Bolt For Corrosive Flange
|
Item
|
Titanium Stud Bolt (Gr2/Gr5)
|
Alloy‑Steel Stud Bolt
|
|
Chloride stress‑corrosion resistance
|
Resist SCC risk under brine‑vapor environment
|
High risk of stress‑corrosion crack failure
|
|
Pre‑load stability under thermal‑cycle
|
Low relaxation, maintain flange sealing
|
Obvious pre‑load loss after multiple heating cycles
|
|
Weight
|
Lightweight, reduce dead‑load of flange assembly
|
Heavy weight for large‑size stud sets
|
|
Typical limitation
|
Galling risk without proper thread lubrication
|
Require heavy anti‑corrosion coating, short service life in chloride media
|
Titanium threaded stud bolt solves stress‑corrosion cracking failure problem of alloy‑steel studs, suitable for flange joints exposed to brine, chloride vapor and temperature cyclic fluctuation.
8. Strict Quality Control & Test Items
-
Raw titanium bar incoming chemical and ultrasonic inspection.
-
Thread‑rolling tooling validation; thread‑profile check for first‑article sample.
-
Thread gauge pass‑fail inspection for each production batch.
-
Mechanical tensile load test, verify stud ultimate tensile capacity.
-
Visual inspection for thread root notch, burr and surface scratch.
-
Issued documents: EN10204 3.1 MTC, mechanical test report, batch traceability record.
9. Export Packaging & Shipment
-
Inner packing: Anti‑rust plastic bag with separating spacer to avoid thread collision and galling damage.
-
Outer packing: Export carton or fumigated wooden case for bulk stud‑bolt sets.
-
Marking: Mark grade, thread specification, length and batch number on package label.
-
Trade terms: FOB, CIF, DDP; sea freight for bulk flange‑project fastener lots.
10. Inquiry & Custom Service (Send Your Drawing Now)
We supply Gr2 & Gr5 titanium threaded stud bolt including full‑thread and half‑thread style, matching titanium nuts can be supplied as complete assembly set.
Please provide below information for accurate quotation:1) Thread size & pitch, overall stud length;2) Full‑thread or half‑thread requirement;3) Working medium & temperature‑cycle condition;4) Whether need matched nuts and anti‑galling coating;5) Order quantity and delivery schedule.
Website: www.sxqytd.com
Contact us for fastener technical evaluation and formal quotation.