DIPTI METAL INDUSTRIES
ASTM A403 WP321 Stainless Steel Butt-Weld Fittings
Specializing in Titanium-Stabilized Austenitic Stainless Steel (UNS S32100, EN 1.4541). Seamless & welded fittings engineered for high-temperature service with excellent intergranular corrosion (IGC) resistance. Ideal for aircraft exhaust, furnace parts, heat exchangers, petrochemicals. Types: Elbows, Tees, Reducers, Caps, Crosses, Stub Ends, Laterals. Range: NPS 1/2″–48″, schedules SCH 5S–XXS.
🏭 Company Introduction
Dipti Metal Industries, founded in 2009 in Mumbai, India, is a globally trusted manufacturer, exporter, and stockist of ASTM A403 WP321 butt-weld fittings. Our Dipti® brand stands for unwavering quality, consistent metallurgical performance, and reliable on-time delivery across 60+ export markets and shipments to 190+ countries.
What sets us apart
- Advanced forming for sound grain flow and repeatable tolerances
- Solution annealed, pickled & cleaned surfaces on request
- Complete documentation: EN 10204 3.1 MTC, QAP/ITP, HT charts, NDE
- Third-party inspection: BV, TÜV, LR, SGS, DNV
Compliance & Capabilities
- Standards: ASME B16.9, B16.28, MSS SP-43, ASTM A403/A403M
- EN 10253-3/4, JIS B2312, GOST compatibility
- PED/CE/IBR support on request
- Global logistics (EXW/FCA/FOB/CFR/CIF)
📘 Grade Overview: WP321 (UNS S32100 / EN 1.4541)
Typical Chemical Composition (wt %)
| Element | Min | Max |
|---|---|---|
| Cr | 17.0 | 19.0 |
| Ni | 9.0 | 12.0 |
| Ti | ≥5×C | 0.70 |
| C | — | 0.08 |
| Mn | — | 2.00 |
| Si | — | 1.00 |
| P | — | 0.045 |
| S | — | 0.030 |
Values indicative; confirm against applicable product standard and PO.
Typical Mechanical Properties (indicative)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (Rm) | ≥ 515 | MPa |
| Yield Strength (Rp0.2) | ≥ 205 | MPa |
| Elongation (A) | ≥ 40 | % |
| Hardness | ≤ 217 | HB (≈95 HRB) |
| Service Temp | Up to ~870 | °C |
Designed for IGC resistance in the sensitization range (425–870 °C); excellent weldability.
Common equivalents: AISI 321, TP321, EN 1.4541 (X6CrNiTi18-10), JIS SUS 321, BS 321S31, GOST 12Х18Н10Т.
📚 Key Standards & Specifications
| Scope | Standard | Description / Notes |
|---|---|---|
| Material | ASTM A403 / A403M | Wrought austenitic stainless steel fittings (WP321). |
| Dimensions | ASME B16.9 | Factory-made wrought buttwelding fittings. |
| Dimensions (bends) | ASME B16.28 | Short radius elbows & returns. |
| Thin-gauge SS | MSS SP-43 | Light-wall stainless butt-weld fittings. |
| EN fittings | EN 10253-3 / 10253-4 | Austenitic and austenitic-ferritic fittings. |
| JIS fittings | JIS B2312 | Butt-welding pipe fittings (JIS). |
| MTC | EN 10204 3.1 | Material test certificates with full traceability. |
| Compliance | PED / CE / IBR | Supported on project request with documentation. |
🔧 Product Range – ASTM A403 WP321
| Category | Types / Forms | Size & Schedule | Condition | Notes |
|---|---|---|---|---|
| Elbows | LR/SR 45°, 90°, 180°; Custom bends; Reducing elbows | NPS 1/2″–48″; SCH 5S–XXS | Solution annealed; pickled/cleaned | ASME B16.9; IGC-resistant high-temp service |
| Tees | Equal, Reducing, Barred (custom), Laterals (45°/90°) | NPS 1/2″–48″; SCH 5S–XXS | Seamless & welded | ASME B16.9 / MSS SP-43 (thin wall) |
| Reducers | Concentric, Eccentric | NPS 1/2″–48″; SCH 5S–XXS | Seamless & welded | Smooth transition for hot lines; optional NDE |
| Caps | Butt-weld pipe caps | NPS 1/2″–48″ | Solution annealed | Header ends, reactor closures, hot service |
| Stub Ends | Long Pattern, Short Pattern (for Lap-Joint flanges) | NPS 1/2″–48″ | Seamless & welded | MSS SP-43 for light wall; thermal cycling tolerant |
| Crosses & Laterals | Equal / Reducing Cross; 45° Laterals | NPS 1/2″–48″ | Custom per drawing | Complex networks in hot/corrosive sections |
Data are indicative; final supply per PO/spec and MTC. Provide drawings/BOQ for exact makeability and QA/QC plan.
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Alternatively, email us your RFQ and attachments:
Email info@diptimetal.com •
diptimetal@gmail.com
📍 Contact
Company
Dipti Metal Industries
Address
No.9, Shreepati Castle, D-1, 10–11th Khetwadi Back Road, Mumbai – 400004, Maharashtra, India
Phone +91-22-66381301 • +91-9975266499 (WhatsApp)
Email
info@diptimetal.com
•
diptimetal@gmail.com
Seaworthy export packing • Line-wise bagging & tagging • Complete documentation & TPI.