What Sets Ganpat Industrial’s ASTM A479 UNS S31803 Washers Apart ?
M6 – M64 In Stock
Duplex 2205 washer sizes racked and ready – quoted inside 24 hours
Heat-Traceable Duplex Coil
UNS S31803 raw stock sourced against mill heat certificates, ASTM A479 compliant
Factory-Direct Rates
Billet to finished F51 washer under one roof – no trading mark-up
PMI Cleared Every Lot
PMI, hardness, dimensional & visual checks before a single piece ships
Every Washer Type, One PO
Flat • Spring • Lock • Star • Square • Spherical in a single shipment
ASTM A479 UNS S31803 Washers Quick Facts
- 1Size Range: M6 to M64 • Custom bore, OD & thickness on drawing
- 2Grade: Duplex 2205 • UNS S31803 • ASTM A182 F51 • WNR 1.4462
- 3Origin: India • Sweden • South Korea mill sources
- 4Types: Flat, Spring, Lock, Star, Square, Spherical, Sealing & Fender Washers
- 5Condition: Solution annealed, pickled & passivated, precision punched
- 6Standards: ASTM A479, ASTM A182, DIN 125, ISO 7089, ASME B18.22.1
Or call our Mumbai office: +91 22 6743 7134 • Same-week dispatch on ready-stock sizes
Duplex 2205 combines a near-equal ferrite and austenite microstructure, and that split is exactly what makes an ASTM A479 UNS S31803 washer outlast a standard 316 part under a bolted flange. The alloy carries roughly twenty-two percent chromium alongside molybdenum and nitrogen, a combination that pushes pitting and crevice resistance well past ordinary austenitic stainless. Yield strength sits close to double that of 316L, so the washer keeps its clamping load under vibration instead of flattening out over time. Ganpat Industrial Corporation punches, machines and passivates every UNS S31803 washer from certified duplex coil at our Mumbai facility, with heat-number traceability carried through from raw material to the finished, tested piece. Offshore platforms, desalination trains, pulp bleaching towers and subsea pipeline flanges all lean on this grade for a reason: it resists chloride attack where 304 and 316 eventually give way. Every dispatch leaves with a mill test certificate, and buyers across India, the GCC and Europe reorder from ready rack stock rather than waiting on a fresh melt.
Mumbai · Duplex Steel Fastener & Washer Manufacturer
ASTM A479 UNS S31803 Washers
Ganpat Industrial punches, machines and passivates Duplex 2205 (UNS S31803 / ASTM A182 F51) Washers for bolted joints that cannot afford a leak – offshore platforms, desalination trains and chemical flanges across India, the GCC and Europe.
- ✓ISO 9001:2015
- ✓PED 2014/68/EU
- ✓NACE MR0175
- ✓NORSOK Certified Material
- ✓ASTM A479 / A182 Compliant
Duplex 2205 Stainless Steel Washers Supplier in India with Thickness 1.6mm – 10mm
Specification Of ASTM A479 UNS S31803 Washers
UNS S31803 Washer Material Grade
- UNS S31803 / S32205
- WNR 1.4462
- Duplex 2205 / SAF 2205
- ASTM A479 / A182 F51
Governing Standard
- ASTM A479 (bar stock)
- ASTM A182 (forged)
- DIN 125 / DIN 127
- ASME B18.22.1
Size Range Offered
- Bore: M6 – M64
- OD: 12mm – 118mm
- Thickness: 1.6mm – 10mm
- Custom bore on drawing
Surface Finish Available
- Pickled & Passivated
- Bright Machined Finish
- Natural Mill Finish
- Black Oxide (on request)
Duplex Washer Type
- Flat / Plain Washer
- Spring & Lock Washer
- Square & Spherical Washer
- Sealing & Fender Washer
Origin
- Indian Origin
- Swedish Origin
- South Korean Origin
- Traceable To Heat Number
Testing Offered
- PMI Testing
- Ferrite Content Test
- Hardness Test
- Third-Party Inspection
Production Route
- Precision Blanking / Punching
- Solution Annealing
- CNC Edge Machining
- Pickling & Passivation
Documentation Supplied
- Mill Test Certificate 3.1
- Material Traceability Report
- Packing List
- Certificate Of Origin
Ready Stock of ASTM A479 Lock and Plain Washers Online With Third Party Inspection At Best Price
Duplex Steel UNS S31803 Washers Dimension Chart
| Nominal Size | Bore Dia (mm) | Outer Dia (mm) | Thickness (mm) | Approx Weight (g/pc) |
|---|---|---|---|---|
| M6 | 6.4 | 12.0 | 1.6 | 1.0 |
| M8 | 8.4 | 16.0 | 1.6 | 1.8 |
| M10 | 10.5 | 20.0 | 2.0 | 3.6 |
| M12 | 13.0 | 24.0 | 2.5 | 6.2 |
| M16 | 17.0 | 30.0 | 3.0 | 11.2 |
| M20 | 21.0 | 37.0 | 3.0 | 17.1 |
| M24 | 25.0 | 44.0 | 4.0 | 32.1 |
| M30 | 31.0 | 56.0 | 4.0 | 53.3 |
| M36 | 37.0 | 66.0 | 5.0 | 91.5 |
Types Of ASTM A479 UNS S31803 Washers
UNS S31803 Flat Washer
DIN 125
Duplex 2205 Spring Washer
DIN 128
ASTM A182 F51 Lock Washer
DIN 127
WNR 1.4462 Square Washer
Beam Type
SAF 2205 Spherical Washer
Angular Joint
Duplex S31803 Star Washer
Internal Tooth
UNS S31803 Sealing Washer
Bonded Type
Duplex 2205 Fender Washer
Wide OD
Need A Full Set – Flat, Spring & Lock Washers In One Order?Send your BOQ and get factory pricing with MTC 3.1, dispatched the same week.
Application Of UNS S31803 Duplex Washers
ASTM A479 UNS S31803 Washers supplier in India offering top-grade materials tailored for harsh industrial applications and long-term reliability.
Offshore Oil & Gas Platforms
Seawater Desalination Plants
Marine & Shipbuilding Hull Fittings
Chemical & Petrochemical Reactors
Bolted Flange & Pipe Joints
Power Generation Cooling Systems
Pulp & Paper Bleach Towers
Coastal & Bridge Infrastructure
Heat Treatment Of ASTM A182 F51 Washers
Solution Annealing
1020–1100°C
Followed by rapid water quench
Hot Forming Range
955–1230°C
Full anneal required after forming
Max Hot Forming Temp
1100–1150°C
Above this, grain growth risk rises
Post-Weld Treatment
Not Required
Unless severe hot forming was performed
ASTM A479 UNS S31803 Washers Are Delivered Monthly to the Following Countries.
| Export To | Country | Shipping Time (Days) | Continent | Port |
|---|---|---|---|---|
| Spain | Spain | 30 | Europe | Barcelona Port |
|
Italy |
Italy | 30 | Europe | Genoa Port |
Welding Guidelines For Duplex 2205 Washers
Filler Metal
ER2209 / E2209 matching consumable maintains duplex phase balance
Heat Input Control
Kept low and controlled to avoid excess ferrite in the weld zone
Shielding Gas
Nitrogen-enriched argon preserves austenite content at the weld
Interpass Temp
Held under 150°C between passes to limit intermetallic formation
Post-Weld Check
Ferrite scope or PMI re-check confirms phase balance after welding
UNS S31803 Washers vs 316L Stainless Steel Washers
UNS S31803 Duplex Washers
- Ferrite-austenite duplex structure
- Yield strength nearly 2x that of 316L
- Superior resistance to chloride pitting
- Strong stress corrosion cracking resistance
- Higher upfront cost, lower lifecycle cost
316L Austenitic Washers
- Fully austenitic structure
- Lower yield strength, softer at clamp load
- Prone to pitting in high-chloride water
- Vulnerable to stress corrosion above 60°C
- Lower unit price, more frequent replacement
Pitting Resistance (PREN) & Corrosion Grade Of DIN 1.4462 Washers
PREN Value
≥ 35
%Cr + 3.3(%Mo) + 16(%N)
Duplex Structure
~50 / 50
Ferrite to austenite phase balance
Vs 316L PREN
~24
316L reference for comparison
Chloride Threshold
High
Rated for brine & seawater duty
Comparing Duplex 2205 Against 316 For Your Next Flange Package?Send us the joint conditions and we’ll confirm the right washer grade the same day.
ASTM A479 UNS S31803 Washers Price Factors
Send your size-wise quantity list and we revert with per-piece pricing within 24 hours, HSN and GST shown on the quotation itself.
HSN Code On Werkstoff Nr. 1.4462 Washers
| Particular | Detail |
|---|---|
| HSN Code | 7318 22 00 |
| GST Rate | 18% |
| Applicable To | Iron / Steel Washers, All Grades |
| Export Benefit | Zero-Rated Under LUT / Bond |
How To Order SAF 2205 Washers ?
Share Your Size List
Email or WhatsApp bore, OD, thickness & quantity per size
Receive Quotation
Per-piece pricing with HSN, GST & lead time within 24 hours
Confirm PO
MOQ starts from 100 pieces per size; no MOQ on ready rack stock
Dispatch
Ready-stock sizes ship same week; custom sizes in 2–3 weeks
Hardness & Pressure-Temperature Rating Of Duplex Steel UNS S31803 Washers
Class 150 Joint
19.6 Bar
Ambient temperature working pressure
Class 600 Joint
102 Bar
High-pressure process piping flanges
Max Service Temp
300°C
Above this, embrittlement risk increases
Min Service Temp
-50°C
Toughness maintained in cold service
ASTM A479 UNS S31803 Washers Fittings Are Delivered Weekly to the Following Countries.
| Export To | Country | Shipping Time (Days) | Continent | Port |
|---|---|---|---|---|
|
USA |
USA | 40-60 | North America | Port of Savannah |
|
Qatar |
Qatar | 7 | Asia | Doha Port |
Sourcing In Bulk For Your Project?Share your BOQ and get factory pricing with MTC 3.1, dispatched the same week.
Test Certificates & Quality Testing Of ASTM A479 UNS S31803 Washers
ASTM A479 UNS S31803 Washers manufacturer in India producing components with premium resistance to degradation to meet demanding specifications.
Chemical Analysis
Every coil checked for Cr, Ni, Mo & N against ASTM A479 limits
PMI Testing
Positive Material Identification on every lot to confirm alloy grade
Ferrite Content Test
Confirms the 50/50 ferrite-austenite phase balance
Intergranular Corrosion Test
Verifies resistance to sensitization per ASTM A262
Dimensional Inspection
Bore, OD & thickness verified against ASME B18.22.1 tolerances
Third-Party Inspection
TPI (SGS, BV, TUV, Lloyd’s) available for export orders
Equivalent Grades Of Duplex Steel UNS S31803 Washers
ASTM / ASME / UNS
- ASTM A479 (Bar) / A182 (Forged)
- UNS S31803
- ASME SA479 / SA182
DIN / EN / WNR
- Werkstoff Nr. 1.4462
- EN 10088-3 / EN 10272
- X2CrNiMoN22-5-3
Trade Names
- SAF 2205® (Sandvik)
- Duplex 2205
- UR 45N
JIS (Japan)
- SUS329J3L
- JIS G4303 (ref group)
- Import Grade Duplex
IS (India Reference)
- IS 2016 (dimensional ref)
- Import Std: ASTM A479
- Sourced On Drawing
GB (China)
- 00Cr22Ni5Mo3N
- GB/T 21833
- 2205 (local trade ref)
Chemical Composition Of UNS S31803 Duplex Washers
ASTM A479 UNS S31803 Washers supplier in India delivering cutting-edge solutions with enhanced protective properties and consistent quality.
ChromiumCr
22.0–23.0%
NickelNi
4.50–6.50%
MolybdenumMo
3.00–3.50%
NitrogenN
0.14–0.20%
ManganeseMn
≤ 2.00%
SiliconSi
≤ 1.00%
PhosphorusP
≤ 0.030%
SulphurS
≤ 0.020%
CarbonC
≤ 0.030%
IronFe
Balance
Mechanical Properties Of ASTM A182 F51 Washers
Tensile Strength
≥ 620 MPa
High Load
Yield Strength (0.2%)
≥ 450 MPa
Design Limit
Elongation
≥ 25%
Ductility
Hardness
≤ 293 HBW
31 HRC Max
ASTM A479 UNS S31803 Washers Packaging
Custom Labelling
PO number, size & heat number marked per buyer requirement
Export Vacuum Pack
Moisture-sealed for long-transit sea freight & humid climates
Poly Bagged By Count
100 / 500 pcs per bag with size tag fitted before packing
Wooden Pallet Box
For bulk quantities & full container-load shipments
Duplex 2205 Washers Documentation On Every Dispatch
Commercial Invoice
PO-matched invoice with HSN & GST breakup
Every Order
Certificate Of Origin
For customs clearance & import duty processing
Export Orders
Material Traceability Report
Coil heat number linked to finished washer batch
On Request
Packing List
Itemised piece count, weight & carton breakup
Every Order
ASTM A479 UNS S31803 Washers – Frequently Asked Questions
What is the difference between UNS S31803 and UNS S32205?
S32205 is a nitrogen-enhanced version of the same duplex family with a tighter chemistry band; both share Werkstoff Nr. 1.4462 and are supplied interchangeably as Duplex 2205.
Are these washers suitable for offshore flanges?
Yes. UNS S31803 is NORSOK and NACE MR0175 compliant, making it a standard choice for offshore platform and subsea bolted joints.
What washer types are available in this grade?
Flat, spring, lock, star, square, spherical, sealing and fender washers are all supplied as standard from ready stock.
Do the washers come with a mill test certificate?
Yes, every dispatch includes an EN 10204 3.1 certificate with full heat traceability; 3.2 is available on request via third-party agency.
Is UNS S31803 magnetic?
Duplex steel is mildly magnetic due to its ferrite content, unlike fully austenitic 316 which is non-magnetic in the annealed condition.
What sizes are kept in ready stock?
M6 to M36 flat and spring washers are typically in rack stock; larger sizes up to M64 are produced against a confirmed order.
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| Angola | Ethiopia | Egypt | Zambia | Ghana | Tanzania |
| New South Wales | Indiana | Texas | California | Algeria | Carolina |
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA