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ASTM A1082 UNS S32205 Duplex 2205 Hex Bolts
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ASTM A1082 UNS S32205 Duplex 2205 Hex Nuts
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Duplex 2205 Full Thread Hex Screw-Metric
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Duplex 2205 Hex Nut – Inches
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Duplex 2205 Hex Nut -Metric
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Duplex 2205 Washer -Inches
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Duplex 2205 Washer -Metric
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DUPLEX STAINLESS STEEL | HIGH-STRENGTH CORROSION-RESISTANT FASTENERS
Duplex Stainless Steel 2205 Bolts, Nuts, Studs & Washers | UNS S31803 / S32205
Duplex 2205 Fasteners combine high mechanical strength with strong resistance to chloride stress-corrosion cracking, pitting and crevice corrosion. Aanuraj supplies bolts, studs, nuts, washers and custom threaded fasteners for demanding industrial and export applications.
UNS S31803UNS S32205EN 1.4462ASTM F51 / F60ASTM A1082 BoltingSAF 2205
1. Duplex 2205 Fasteners - Technical Overview
Duplex 2205 is a ferritic-austenitic stainless steel family with high strength and strong resistance to chloride-related corrosion.
For designers and engineers, the two UNS designations most commonly associated with 2205 are S31803 and S32205. Both are associated with EN 1.4462 and the 22Cr-5Ni-3Mo duplex family, but the controlled composition limits are not identical. Specify the exact UNS grade on the purchase order and MTC.
~50/50Duplex ferrite + austenite structure
450 MPa+Typical minimum proof/yield basis for 2205 product standards
~35Typical PREN region for 2205
2xApprox. proof-strength advantage vs many austenitic grades
Engineering note: Finished fastener acceptance requirements depend on the specified fastener standard, product form, size, heat treatment, tests and purchase specification. Do not use generic 2205 bar values as a substitute for the required fastener specification.
2. Duplex 2205 - Different Names, Grades & Designations
| Designation / Name | Identification | Use in technical documents |
|---|---|---|
| Duplex 2205 | Common commercial name | General engineering and procurement description. |
| UNS S31803 | Duplex stainless steel | Original/common 2205 UNS designation; associated with ASTM F51 in forging/product-form references. |
| UNS S32205 | Duplex stainless steel | More tightly controlled 2205 chemistry; associated with ASTM F60 in forging/product-form references. |
| EN 1.4462 | X2CrNiMoN22-5-3 | European material designation. |
| W.Nr. 1.4462 | 1.4462 | Werkstoff number used in European documentation. |
| DIN X2CrNiMoN 22 5 3 | Duplex 22Cr-5Ni-3Mo-N | DIN chemical designation. |
| SAF 2205 | Trade/product name | Well-known commercial name; use UNS/EN designation for purchase clarity. |
| ASTM A182 F51 / F60 | Forged product grades | Applicable to pressure-component forgings/product forms, not a universal finished-fastener standard. |
| ASTM A1082/A1082M | Duplex stainless bolting specification | Special-purpose high-strength duplex/stainless bolting specification; grade selection and size requirements must be checked. |
3. Key Features of Duplex Stainless Steel 2205 Fasteners
High Mechanical Strength
Higher proof strength than conventional 304/316 austenitic stainless grades can allow efficient bolted-joint design.
Higher proof strength than conventional 304/316 austenitic stainless grades can allow efficient bolted-joint design.
Chloride SCC Resistance
Strong resistance to stress-corrosion cracking in chloride-bearing environments.
Strong resistance to stress-corrosion cracking in chloride-bearing environments.
Pitting & Crevice Resistance
Chromium, molybdenum and nitrogen contribute to localized-corrosion resistance.
Chromium, molybdenum and nitrogen contribute to localized-corrosion resistance.
Hydrogen Sulfide Service
2205 is used in selected sour-service applications subject to the applicable NACE/ISO requirements.
2205 is used in selected sour-service applications subject to the applicable NACE/ISO requirements.
Good Wear & Erosion Resistance
Duplex metallurgy provides useful resistance to erosion-corrosion and corrosion fatigue.
Duplex metallurgy provides useful resistance to erosion-corrosion and corrosion fatigue.
Lower Nickel Than Many Austenitics
2205 achieves high strength and corrosion resistance with a lower nickel level than many high-alloy austenitic grades.
2205 achieves high strength and corrosion resistance with a lower nickel level than many high-alloy austenitic grades.
4. Duplex 2205 Chemical Composition - All Principal Elements
| Element | S31803 / F51 reference, wt.% | S32205 / F60 reference, wt.% | Function / design relevance |
|---|---|---|---|
| Carbon (C) | 0.030 max. | 0.030 max. | Low carbon limits carbide formation. |
| Silicon (Si) | 1.00 max. | 1.00 max. | Deoxidation/process element. |
| Manganese (Mn) | 2.00 max. | 2.00 max. | Strength/process control. |
| Phosphorus (P) | 0.030 max. | 0.030 max. | Controlled residual element. |
| Sulfur (S) | 0.020 max. | 0.020 max. | Controlled residual element. |
| Chromium (Cr) | 21.0 - 23.0 | 22.0 - 23.0 | Passive film and localized corrosion resistance. |
| Nickel (Ni) | 4.5 - 6.5 | 4.5 - 6.5 | Austenite stabilization and toughness. |
| Molybdenum (Mo) | 2.5 - 3.5 | 3.0 - 3.5 | Pitting/crevice corrosion resistance. |
| Nitrogen (N) | 0.08 - 0.20 | 0.14 - 0.20 | Austenite balance, strength and pitting resistance. |
| Iron (Fe) | Balance | Balance | Principal matrix element. |
The S31803/S32205 chemistry ranges above are presented as procurement-oriented references. Exact limits depend on the applicable product specification and edition; the purchase specification and MTC govern.
5. Duplex 2205 Mechanical & Physical Properties
| Property | S31803 / 2205 reference | S32205 / 2205 reference | Engineering significance |
|---|---|---|---|
| 0.2% Proof / Yield Strength | 450 MPa min. in common ASTM A182-type reference | 450 MPa min. in common ASTM A182-type reference | High load-carrying capability. |
| Tensile Strength | 620 MPa min. | 655 MPa min. | Ultimate tensile capacity reference. |
| Elongation | 25% min. | 25% min. | Ductility reference. |
| Hardness | 293 HB max. in common A182-type reference | 293 HB max. in common A182-type reference | Useful for machining and acceptance control. |
| Density | Approx. 7.8 g/cm3 | Approx. 7.8 g/cm3 | Useful for weight estimation. |
| Elastic Modulus | Approx. 200 GPa | Approx. 200 GPa | Useful for stiffness calculations. |
| Thermal Conductivity | Approx. 15 W/m.K | Approx. 15 W/m.K | Thermal design reference. |
| Poisson Ratio | Approx. 0.30 | Approx. 0.30 | Elastic analysis reference. |
| Melting Point | Approx. 1350 C | Approx. 1350 C | General physical-property reference. |
Do not mix standards: ASTM A1082/A1082M is a dedicated high-strength bolting specification, while ASTM A182, A276/A479 and A240 cover different product forms. Select the standard according to the actual component and project requirement.
6. PREN of Duplex 2205 - Pitting Resistance Equivalent Number
PREN formula: PREN = %Cr + 3.3 x %Mo + 16 x %N.
S31803
Using representative/minimum chemistry values, PREN is commonly in the low-30s. Actual value depends on the heat chemistry.
Using representative/minimum chemistry values, PREN is commonly in the low-30s. Actual value depends on the heat chemistry.
S32205
With tighter Mo and N floors, S32205 is commonly associated with a PREN around 35 when calculated from representative chemistry.
With tighter Mo and N floors, S32205 is commonly associated with a PREN around 35 when calculated from representative chemistry.
Engineering Use
PREN is a comparative indicator, not a complete corrosion qualification. Temperature, chlorides, pH, surface condition and stress also matter.
PREN is a comparative indicator, not a complete corrosion qualification. Temperature, chlorides, pH, surface condition and stress also matter.
7. Duplex 2205 Solution Annealing & Quenching
01Heat
1020-1100 C
1020-1100 C
02Soak
Heat complete section
Heat complete section
03Solution Anneal
Restore balanced structure
Restore balanced structure
04Rapid Cool
Water preferred
Water preferred
05Inspect
Dimensions + hardness + MTC
Dimensions + hardness + MTC
Recommended material heat treatment: 1020-1100 C (1870-2010 F) followed by rapid cooling, commonly water quenching for 2205. The exact procedure for a forged fastener should follow the specified material/fastener standard, furnace procedure and qualified manufacturing route.
8. Duplex 2205 Fasteners - Standards & Dimensional References
| Component / requirement | Common reference | Purpose |
|---|---|---|
| Special-purpose bolting | ASTM A1082/A1082M + ASTM A962/A962M | High-strength duplex/stainless bolting; includes requirements for testing, finish, threads, marking and certification through referenced requirements. |
| Forged pressure components | ASTM A182 F51 / F60 | Duplex forging material grades for pressure-related components. |
| Bar / round stock | ASTM A276 / ASTM A479 | Stainless bar and pressure-vessel-quality bar product forms. |
| Plate / sheet | ASTM A240 | Flat-product material reference. |
| Metric hex bolts | ISO 4014 / ISO 4017; DIN 931 / DIN 933 | Dimensional and thread configuration reference. |
| Inch hex bolts | ASME B18.2.1 | Inch-series hex bolt dimensions. |
| Metric hex nuts | ISO 4032 / DIN 934 | Metric hex nut dimensions. |
| Inch hex nuts | ASME B18.2.2 | Inch nut dimensions. |
| Threads | ASME B1.1 / ISO metric thread standards | UNC/UNF and metric thread geometry/tolerances. |
| Washers | ISO 7089 / DIN 125 / ASME B18.21.1 | Plain washer dimensions. |
9. Duplex 2205 Fastener Dimensions - Designer Reference
Metric Hex Bolts
M6 to M100 can be supplied subject to product standard, manufacturing route and drawing. Common engineering references include ISO 4014/4017 and DIN 931/933.
M6 to M100 can be supplied subject to product standard, manufacturing route and drawing. Common engineering references include ISO 4014/4017 and DIN 931/933.
Inch Hex Bolts
Common inch sizes from 1/4 in to 2 in and larger project-specific sizes can be manufactured to ASME dimensional requirements.
Common inch sizes from 1/4 in to 2 in and larger project-specific sizes can be manufactured to ASME dimensional requirements.
Studs / Threaded Rod
Full-thread and double-end configurations can be supplied in metric or inch threads to drawing/specification.
Full-thread and double-end configurations can be supplied in metric or inch threads to drawing/specification.
Hex Nuts
Standard and heavy-hex nuts can be produced to the selected dimensional standard and matching thread.
Standard and heavy-hex nuts can be produced to the selected dimensional standard and matching thread.
Washers
Plain washers can be supplied in metric and USS/SAE inch configurations according to project specification.
Plain washers can be supplied in metric and USS/SAE inch configurations according to project specification.
Custom Fasteners
Special lengths, reduced shanks, non-standard threads and drawing-controlled components can be reviewed.
Special lengths, reduced shanks, non-standard threads and drawing-controlled components can be reviewed.
10. Types of Duplex 2205 Fasteners
Hex Bolts
Full-thread and partial-thread hex bolts for flanges, structures and equipment.
Full-thread and partial-thread hex bolts for flanges, structures and equipment.
Hex Nuts
Matching nuts for duplex bolting assemblies.
Matching nuts for duplex bolting assemblies.
Full Threaded Studs
Threaded studs for flanges, valves, pressure equipment and structural connections.
Threaded studs for flanges, valves, pressure equipment and structural connections.
Stud Bolts
Double-end and full-thread configurations for industrial bolted joints.
Double-end and full-thread configurations for industrial bolted joints.
Washers
Plain washers for load distribution and surface protection.
Plain washers for load distribution and surface protection.
U-Bolts / Special Parts
Custom-bent or drawing-specific duplex components for pipe supports and assemblies.
Custom-bent or drawing-specific duplex components for pipe supports and assemblies.
11. Important Pointwise Selection Guide for Designers & Engineers
1. Define the exact UNS grade
Write S31803 or S32205 instead of only writing "2205".
Write S31803 or S32205 instead of only writing "2205".
2. Define the fastener standard
Material grade alone does not define finished fastener dimensions and acceptance tests.
Material grade alone does not define finished fastener dimensions and acceptance tests.
3. Specify thread system
State metric pitch or UNC/UNF thread, tolerance class and fit.
State metric pitch or UNC/UNF thread, tolerance class and fit.
4. Specify heat treatment
For duplex material, solution annealing and rapid cooling are critical to maintaining the intended phase balance.
For duplex material, solution annealing and rapid cooling are critical to maintaining the intended phase balance.
5. Consider service environment
Check chlorides, temperature, H2S, pH, stress and corrosion mechanism.
Check chlorides, temperature, H2S, pH, stress and corrosion mechanism.
6. Require traceability
Heat number, MTC, PMI and required inspection documents should be stated in the purchase order.
Heat number, MTC, PMI and required inspection documents should be stated in the purchase order.
12. Duplex 2205 Bolts, Nuts & Washers - Applications
Oil & Gas
Flanges, valves, piping, offshore equipment and sour-service applications subject to project qualification.
Flanges, valves, piping, offshore equipment and sour-service applications subject to project qualification.
Petrochemical
Process equipment and bolted joints exposed to chlorides and aggressive media.
Process equipment and bolted joints exposed to chlorides and aggressive media.
Chemical Plants
Reactors, tanks, piping and equipment requiring high strength plus corrosion resistance.
Reactors, tanks, piping and equipment requiring high strength plus corrosion resistance.
Marine & Offshore
Marine structures and equipment exposed to chloride-rich environments.
Marine structures and equipment exposed to chloride-rich environments.
Water & Desalination
Pumps, piping and equipment where chloride corrosion is a design concern.
Pumps, piping and equipment where chloride corrosion is a design concern.
Power & Infrastructure
Heavy-duty structural and process applications requiring high-strength stainless bolting.
Heavy-duty structural and process applications requiring high-strength stainless bolting.
13. Why Aanuraj for Duplex 2205 Fasteners?
Hot Forging Expertise
Aanuraj's orange/yellow identity represents the hot-forging process used to manufacture demanding fastener components.
Aanuraj's orange/yellow identity represents the hot-forging process used to manufacture demanding fastener components.
Duplex & Exotic Grade Knowledge
Technical experience across stainless, duplex, super duplex and high-nickel fasteners.
Technical experience across stainless, duplex, super duplex and high-nickel fasteners.
Material Traceability
Heat identification, PMI and MTC documentation can be arranged according to project requirements.
Heat identification, PMI and MTC documentation can be arranged according to project requirements.
Machining + Thread Rolling
Forging, CNC machining and thread-rolling capability supports controlled production.
Forging, CNC machining and thread-rolling capability supports controlled production.
Custom Engineering
Metric, inch, long-length studs, special bolts, nuts, washers and drawing-specific parts.
Metric, inch, long-length studs, special bolts, nuts, washers and drawing-specific parts.
Quality Focus
Inspection and documentation support for industrial and critical bolting requirements.
Inspection and documentation support for industrial and critical bolting requirements.
14. Why Duplex 2205 Instead of Conventional Austenitic Stainless?
| Design consideration | Duplex 2205 | Engineering implication |
|---|---|---|
| Strength | High proof strength | Can support high-load bolting designs; verify fastener-specific allowable stresses. |
| Chloride SCC | Strong resistance | Useful for marine, offshore and chloride-bearing service. |
| Pitting / Crevice | Good to high resistance | Mo + Cr + N chemistry improves localized-corrosion resistance. |
| Nickel content | Lower than many high-Ni austenitics | Can provide a useful alloying-cost balance. |
| Microstructure | Ferritic + austenitic | Heat treatment and cooling rate are important to preserve phase balance. |
15. European & Export Keywords - Duplex 2205 Fasteners
European countries: Germany, United Kingdom, France, Italy, Spain, Netherlands, Belgium, Poland, Sweden, Norway, Denmark, Finland, Austria, Switzerland, Czech Republic, Portugal, Greece, Ireland, Romania, Hungary and European Union markets.
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BUY ONLINE TALK TO TECH EXPERTTechnical note: This page is an engineering reference, not a substitute for the current edition of the specified ASTM/ASME/EN/DIN standard, project specification or certified MTC. Product-form and fastener-specific requirements must be verified before purchase or certification.