Duplex 2205 Stud Bolts
ASME B18.31.2 · DIN 976-1ASTM A276 / A479 — bar
Duplex 2205 studs suit pump casings, valve bonnets and exchanger covers in compatible chloride-bearing service. Their combination of strength and corrosion resistance is useful in loaded closures that must be opened repeatedly, with separate end lengths available for tapped-body arrangements.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution annealed and quenched
EN 10204 3.1 MTC + heat-number traceability
Duplex 2205 in this connection
Duplex stainless combines higher yield strength than conventional austenitic grades with improved resistance to chloride stress-corrosion cracking.
- Connection
- Heat-exchanger utility covers & cooling-water flanges
- Critical dimensions
- Overall length · end-thread lengths · nut engagement
Which standard is on your order?
Raw Material Specifications
Finished-Stud Specifications
Threads · Metric
Threads · Inch
Dimension Reference
Heat Treatment
Solution annealed and rapidly cooledSolution annealing followed by rapid cooling controls harmful precipitates and preserves the ferrite–austenite structure.
What we can make in Duplex 2205
Forms & dimension guideFully threaded
Two nuts clamp the flange or cover; usable thread length spans the assembled grip.
Double-end
A plain centre spans the grip, with a threaded portion at each end for the nuts.
Tap-end
One end engages a tapped casing; the exposed end accepts the cover nut.
- Product forms
- Full thread · Double-end · Tap-end
- Dimensional control
- Overall length · end-thread lengths · nut engagement
- Manufacturing
- Cut bar, CNC-finish ends and any grip features; roll or cut the specified threads. Studs do not require a headed-bolt upsetting operation.
- Final condition
- Solution annealing and rapid cooling preserve the required duplex structure.
- Inspection
- Grade identity · phase balance / corrosion tests when ordered · mechanical properties
Where Duplex 2205 fits — and what matters
Split-case & multistage pump casings
Duplex 2205 Stud BoltsOn a split-case pump, 2205 studs can carry the cover load in compatible brackish- or process-water service. Double-end forms let the casing-side engagement remain undisturbed during overhaul. Setting that engagement separately from the nut-end length gives the heavy cover the intended fastening arrangement on reassembly.
Connection requirements
- Pumped liquid and metal temperature
- Tapped-body engagement or through-stud form
- Cover and nut stack
High-pressure valve bonnets
Duplex 2205 Stud BoltsValve bonnet studs carry a sustained closure load while remaining exposed to leaks and washdown. 2205 provides useful strength and resistance to chloride stress-corrosion cracking in compatible service. The nut-end thread needs sufficient length for the bonnet, washer and full nut engagement throughout the installed arrangement.
Connection requirements
- Valve pressure and bonnet load
- Fluid chemistry and temperature
- Nut-side projection and thread class
Plate & shell heat-exchanger covers
Duplex 2205 Stud BoltsA heat-exchanger cover may see brackish cooling water on one side and a different process fluid on the other. 2205 studs are useful where the external bolt exposure is compatible with duplex steel. Cover thickness, gasket compression and two nut heights determine the stud length needed for reliable reassembly.
Connection requirements
- Cooling and process-side leakage chemistry
- Cover stack and gasket allowance
- Stud condition and nut pairing
Same stud. Different material priorities.
Duplex 2205 material dataSuper Duplex 2507 Stud Bolts
2507 studs are useful on seawater pump covers and high-pressure desalination connections where corrosion resistance and strength are both priorities. The stud arrangement keeps nuts accessible and helps locate removable covers. Compared with 2205 studs, they address more demanding chloride exposure; the final heat-treated condition is central to that performance.
254 SMO Stud Bolts
254 SMO studs retain seawater-pump and bleach-plant covers exposed to chloride-bearing residues. The six-moly austenitic alloy offers improved localized-corrosion resistance over 316. Removable nuts permit servicing, while defined housing engagement and nut-end projection suit double-end cover studs.
Inconel 625 Stud Bolts
Offshore flanges and marine valve bonnets put the stud threads, nut seats and exposed shank in different pockets of chloride exposure. Inconel 625 studs bring pitting and crevice-corrosion resistance to that loaded connection. On tapped-stud bonnets, crews can remove the nuts and cover while leaving the studs installed in the valve body.
From drawing to documented delivery
- 01Drawing & BOMGrade, condition and part dimensions
- 02Sample lotOptional · typically ~20 days
- 03Production & testingTypically 25–35 days
- 04Documents & dispatchHeat-linked lots and packing
Connection & acceptance
Heat-exchanger utility covers & cooling-water flanges: Utility-water chlorides · cleaning temperature · gasket compression.
Material & final condition
Solution annealing and rapid cooling preserve the required duplex structure.
Connection inspection
Overall length · end-thread lengths · nut engagement. Grade identity · phase balance / corrosion tests when ordered · mechanical properties.
Matching Kit
Flange Stud Bolt Kits
Build your Duplex 2205 stud enquiry
Upload drawing insteadQuestions about Duplex 2205 stud bolts & threaded rods
S31803 or S32205 on the stud certificate?
Both designations are associated with 2205, but they have different composition limits. The order and certificate should identify the specified UNS; dual certification requires the heat to satisfy both.
Technical references & photo credits
Catalogue photography shows product form. Application examples connect alloy properties to equipment duties; they are not customer installation records. Quantities, schedules and the inspection scope are confirmed in the quotation.