ASTM A182 Duplex Steel Forged Pipe Fittings Manufacturer, Exporter & Supplier in India
Amardeep Steel is an ISO-certified manufacturer, supplier, and exporter of ASTM A182 Duplex Steel Forged Fittings conforming to ANSI/ASME B16.11 and BS3799 dimensional standards. As a specialized segment of our comprehensive Duplex Steel Fittings range, these forged components offer superior structural integrity for high-pressure applications. We also keep stock of all duplex grades such as UNS S31803, S32205 (Duplex 2205 / DIN 1.4462), S32550, S32750 and S32760, which are made of mill-certified raw materials of the leading global sources.
Our Duplex Steel Forged Fittings are available in both Socket Weld (S/W) and Threaded (NPT, BSP, BSPT) configurations, across pressure classes 2000 LBS to 9000 LBS. Having an in-house testing laboratory and the capacity to have inspection done by third parties, each batch is tested against PMI, NDT, Ultrasonic, and Hydrostatic tests. Our products serve various high-end industries such as Oil and Gas, Petrochemicals, Desalination, Fertilizers, and Marine across the globe.
Table of Contents
- Duplex Steel Forged Pipe Fittings Manufacturer
- Specifications
- Types of Duplex Steel Forged Fittings
- Chemical Composition
- Mechanical & Physical Properties
- Unique Two-Phase Microstructure
- Equivalent Grade Chart
- Dimensional Tolerance Chart
- Pressure Rating
- Features & Benefits
- Applications
- Quality Testing & Certification
- Manufacturing Process
- Marking & Stamping
- Packaging
- HSN Code
- Why Choose Amardeep Steel
- Related Products
- FAQs
Duplex Steel Forged Fittings Specifications
| Parameter | Details |
|---|---|
| Standard | ASTM A182 / ASME SA182 |
| Dimensions | ANSI/ASME B16.11, BS3799, MSS SP-79 |
| Size Range | ½" NB to 4" NB | Welded: ½" – 48" | Seamless: ½" – 10" |
| Grades | UNS S31803, S32205 (Duplex 2205), S32550, S32750, S32760 |
| Werkstoff Nr. | 1.4462 (equivalent to UNS S31803 / S32205) |
| Pressure Class | 2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS |
| Schedule | SCH 5 to SCH 160, XXS |
| End Connection | Socket Weld (S/W) | Threaded: NPT, BSP, BSPT |
| Form | Elbow, Tee, Cross, Reducer, Cap, Coupling, Union, Nipple, Plug, Bushing |
| Process | Welded, Seamless, Fabricated, Forged |
| Origin | Japanese, European, Korean, American |
| Finish | Polished, Pickled (Mill Finish available) |
| Heat Treatment | Solution Annealing: 1020°C – 1100°C (1868°F – 2012°F) + Water Quench |
| Hot Forming | 1100°C – 1150°C (2010°F – 2100°F) |
| HSN Code | 73079990 |
Types of Duplex Steel Forged Fittings
- Forged Threaded Elbow
- Forged Threaded Equal & Unequal Tee
- Threaded Equal & Unequal Cross
- Threaded Half & Full Couplings
- Threaded Reducing Couplings
- Threaded Cap
- Threaded Reducing Insert
- Threaded Bushing
- Threaded Pipe Nipples
- Threaded Hex Nipples
- Threaded Plug
- Threaded Unions
- Forged Socket Weld Elbow
- Forged Socket Weld Equal & Unequal Tee
- Socket Weld Equal & Unequal Cross
- Socket Weld Half & Full Couplings
- Socket Weld Reducing Couplings
- Socket Weld Cap
- Socket Weld Reducing Insert
Chemical Composition — Duplex Steel High Pressure Fittings
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| S31803 | ≤0.030 | ≤2.00 | ≤1.00 | ≤0.030 | ≤0.020 | 22.0–23.0 | 3.0–3.5 | 4.5–6.5 | 0.14–0.20 | ≥63.72 |
| S32205 | ≤0.030 | ≤2.00 | ≤1.00 | ≤0.030 | ≤0.020 | 21.0–23.0 | 2.5–3.5 | 4.5–6.5 | 0.08–0.20 | ≥63.54 |
Mechanical & Physical Properties — ASTM A182 Duplex Steel S31803 / S32205
| Property | Value |
|---|---|
| Density | 7.805 g/cm³ (0.285 lb/in³) |
| Melting Point | 1420°C – 1465°C (2588°F – 2669°F) |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion | 13.7 × 10⁻&sup6; /K |
| Thermal Conductivity | 19.0 W/m·K |
| Electrical Resistivity | 0.85 × 10⁻&sup6; Ω·m |
| Tensile Strength (min) | 620 MPa (90 ksi) |
| Yield Strength (min) | 450 MPa (65 ksi) |
| Elongation (min) | 25% |
| Hardness (max) | 293 HBW |
Unique Two-Phase Microstructure of Duplex Steel
Duplex stainless steel derives its exceptional performance from a balanced two-phase microstructure combining approximately 50% austenite and 50% ferrite. This dual-phase structure provides the toughness and weldability of austenitic grades with the strength and chloride stress corrosion cracking resistance of ferritic grades.
Contributes toughness, weldability, and formability — making forged fittings suitable for fabrication-intensive piping systems.
Delivers higher strength, excellent resistance to chloride stress corrosion cracking (SCC), and lower thermal expansion.
Equivalent Grade Chart of Duplex SS Forged Fittings
| Standard Name | Werkstoff Nr. | UNS |
|---|---|---|
| Duplex 2205 | 1.4462 | S31803 / S32205 |
Dimensional Tolerance Chart of Duplex 2205 Forged Union (ASME B16.11)
| NPS | I.D | O.D | Wall Thk. T | Length H | C-E Dim. A,B,C | Length F |
|---|---|---|---|---|---|---|
| ½ to 2½ | — | +0.06 / -0.03 | ≥87.5% nominal | ±0.06 | ±0.06 | ±0.12 |
| 3 to 3½ | ±0.06 | ±0.06 | ±0.06 | ±0.06 | ±0.06 | ±0.12 |
| 4 | ±0.06 | ±0.06 | ±0.06 | ±0.06 | ±0.06 | ±0.12 |
| 5 to 8 | ±0.06 | ±0.06 | ±0.06 | ±0.06 | ±0.06 | ±0.25 |
| 10 to 18 | ±0.12 | +0.16/-0.12 | ±0.09 | ±0.09 | ±0.09 | ±0.25 |
| 20 to 24 | ±0.19 | +0.25/-0.19 | ±0.09 | ±0.09 | ±0.09 | ±0.25 |
| 26 to 30 | ±0.19 | +0.25/-0.19 | ±0.19 | ±0.12 | ±0.19 | ±0.38 |
| 32 to 48 | ±0.19 | +0.25/-0.25 | ±0.19 | ±0.19 | ±0.19 | ±0.38 |
Pressure Rating of UNS S32205 Duplex F60 Screwed / Threaded Elbow (PSI)
| Temp °F | Temp °C | Cl. 150 | ¼–1" Cl.300 | 1¼–2" Cl.300 | 2½–3" Cl.300 |
|---|---|---|---|---|---|
| -20 to 150 | -29 to 66 | 300 | 2000 | 1500 | 1000 |
| 200 | 93 | 265 | 1785 | 1350 | 910 |
| 250 | 121 | 225 | 1575 | 1200 | 825 |
| 300 | 149 | 185 | 1360 | 1050 | 735 |
| 350 | 177 | 150 | 1150 | 900 | 650 |
| 400 | 204 | — | 935 | 750 | 560 |
| 450 | 232 | — | 725 | 600 | 475 |
| 500 | 260 | — | 510 | 450 | 385 |
| 550 | 288 | — | 300 | 300 | 300 |
Features & Benefits of Duplex Steel Forged Fittings
- High Tensile Strength (≥620 MPa): Withstands high pressure without increasing wall thickness
- Resistance to Chloride SCC: Ideal for offshore, seawater & chemical plant environments
- Low Thermal Expansion: Reduces thermal fatigue in cyclic temperature applications
- Excellent Weldability: No post-weld heat treatment required in most applications
- Good General Corrosion Resistance: Long service life in acids, alkalis, and chloride media
- Cost-Effectiveness: Superior strength allows smaller wall thickness vs austenitic grades
- Wide Grade Range: Grade-specific selection for each corrosion environment
Applications of Duplex Steel Forged Fittings
Duplex Steel Forged Fittings are specified across a wide range of industries due to their balance of strength and corrosion resistance:
- Wellheads, manifolds, subsea pipework, process piping
- Reactors, heat exchangers, scrubbers, storage tanks
- Seawater intake systems, brine disposal, membrane housings
- Urea synthesis, ammonia lines, phosphoric acid systems
- Bleaching circuits, chlorination towers, process water lines
- Deck fittings, shipbuilding, offshore platforms
- Flue gas desulfurisation (FGD), cooling water systems
- High-purity piping requiring corrosion-free surfaces
Quality Testing & Certification of Duplex Steel Forged Pipe Fittings
- Raw Material Certificate: Mill test report from certified raw material manufacturers
- EN 10204 / 3.1B MTC: Independent inspection by accredited third-party lab
- PMI Test: Positive Material Identification for grade verification
- NDT Test: Non-Destructive Testing per customer and project specs
- Ultrasonic Test (UT): Internal defect detection in forged components
- HIC Test: Hydrogen Induced Cracking test for sour service environments
- 100% Radiography Test: Full RT report for critical fittings per BS3799 / ASME
- Third Party Inspection: TPI by SGS, Bureau Veritas, Lloyd’s Register, TÜV etc.
Manufacturing Process of Duplex Steel Forged Fittings
- Mill-certified billet / bar stock from approved global origins (Japanese, European, Korean, American)
- Hot forming at 1100°C–1150°C (2010°F–2100°F) under controlled press / hammer conditions
- Heat treatment at 1020°C–1100°C (1868°F–2012°F) followed by rapid water quench to restore duplex microstructure
- CNC machining for thread form (NPT / BSP / BSPT) and socket weld bore dimensions to ASME B16.11
- Pickling / passivation or polishing as per order requirement
- PMI, UT, NDT, HIC, Radiography, dimensional check, hardness test
- Stencil / electro-etching of grade, heat number, size, standard; packed for export
Marking & Stamping
Each Duplex Steel Forged Fitting supplied by Amardeep Steel is permanently marked per ASME B16.11 requirements to ensure full traceability:
ASTM A182 | F51 / F60 | UNS S31803 / S32205 | Size (NPS) | Schedule / Press Class | Heat Number
Marking method: Low-stress electro-etching for thin-wall fittings; Die stamping for heavy-wall / large bore fittings. Colour-coding by grade available on request.
Packaging of Duplex Steel Forged Fittings
- Individual Bubble Wrap for small bore and high-value fittings
- Bundled packing with PP straps for medium quantity shipments
- Wooden Box / Wooden Crate with moisture-absorbing desiccant for export
- Polybag + Carton for lightweight fittings in small quantities
- All packages clearly stencilled with Grade, Size, Heat No., PO No., and Amardeep Steel branding
Duplex Steel Forged Pipe Fittings HSN Code
| Product | HSN Code |
|---|---|
| Duplex Steel Forged Fittings | 73079990 |
Why Choose Amardeep Steel for Duplex Steel Forged Fittings
- 35+ Years in Business: Established manufacturer with decades of metallurgical expertise
- 80+ Export Countries: Trusted by engineering firms across 5 continents
- ISO Certified Facility: In-house testing lab with third-party inspection capability
- 5+ Duplex Grades In Stock: S31803, S32205, S32550, S32750, S32760 — ready to ship
- MTC EN 10204 / 3.1B: Full material traceability with mill-certified documentation
- TPI SGS / BV / Lloyd’s: Third-party inspections accepted from all major agencies
Request a Quote for Duplex Steel Forged Fittings
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Frequently Asked Questions - Duplex Steel Forged Fittings
What standard governs Duplex Steel Forged Fittings?
Duplex Steel Forged Fittings are manufactured to ASTM A182 / ASME SA182. Dimensional standards are ANSI/ASME B16.11 (socket weld and threaded fittings) and BS3799. This ensures full compatibility with global piping systems.
Which grades of Duplex Steel are available in Forged Fittings?
Amardeep Steel stocks Duplex Steel Forged Fittings in UNS S31803, S32205 (also known as Duplex 2205 or DIN 1.4462), S32550, S32750, and S32760. Each grade is selected based on the corrosion environment and temperature requirements.
What sizes are available in Duplex Steel Forged Fittings?
Standard sizes range from ½" NB to 4" NB in socket weld and threaded configurations. For welded fittings, sizes from ½" to 48" are available; for seamless, ½" to 10". Custom sizes can be produced on request.
What pressure classes are offered?
Duplex Steel Forged Fittings are available in pressure classes 2000 LBS, 3000 LBS, 6000 LBS, and 9000 LBS. Wall thickness corresponds to SCH 80/XS (3000 LBS), SCH 160 (6000 LBS), and XXS (9000 LBS) pipe schedules.
What heat treatment is applied to Duplex 2205 Forged Fittings?
All ASTM A182 Duplex S32205 forged fittings undergo solution annealing at 1020°C–1100°C (1868°F–2012°F) followed by water quenching. This restores the balanced austenite-ferrite microstructure and removes any sigma phase formed during hot working.
Which industries commonly use Duplex Steel Forged Fittings?
Key industries include Oil & Gas (upstream and midstream), Petrochemicals, Chemical Processing, Desalination, Fertilizers, Pulp & Paper, Marine & Offshore, and Power Generation. The combination of high strength and chloride stress corrosion cracking resistance makes them ideal for aggressive environments.
What test certificates are provided with your Duplex Steel Forged Fittings?
Each order includes Raw Material Certificate, EN 10204/3.1B Mill Test Report, PMI Test Certificate, Ultrasonic Test Report, and HIC Test Report (for sour service). Third-party inspection reports by SGS, BV, or Lloyd’s Register are available on request.
