ASTM A213 TP321 Stainless Steel Seamless Tube
Stainless steel is known for its superior corrosion resistance compared to regular carbon steel, though it is not completely immune to corrosion. The presence of chromium forms a protective surface layer that prevents corrosion, while carbon steel rusts when exposed to moisture and air. These antioxidant properties make stainless steel ideal for various applications.
Stainless steel sheets are preferred where low maintenance and corrosion resistance are essential, used in modern building cladding, food hygiene industries, and more due to their antimicrobial qualities.
Stainless Steel Seamless (SMLS) pipes are manufactured by drawing a solid billet over a perforated rod, creating a hollow shell without welding. This process makes seamless pipes stronger, more reliable, and more pressure-resistant than welded alternatives.
Grades 321 and 347 are austenitic 18/8 steels stabilized with titanium (321) or niobium (347), resisting intergranular corrosion when heated between 425-850°C. Grade 321 is ideal for applications up to 900°C, offering high strength, scaling resistance, phase stability, and water corrosion resistance.
Grade 321H, with higher carbon content, provides increased high-temperature strength. However, Grade 321 is unsuitable as welding material due to titanium's poor transfer in high-temperature arcs; Grade 347 is preferred for welding and is the standard consumable for Grade 321.
Both grades offer excellent forming and welding characteristics, exceptional toughness at low temperatures, but Grade 321 does not polish well and is not recommended for decorative applications.
Technical Specifications
Standards & Specifications
| 321 | AMS 5557, 5570, 5576, 5645 |
| 321 | MIL-T-8606, 8808, 8973 |
Standard Specifications
| Standard Specification | AMS 5557, 5559, AMS 5570, MI-L-T 8808, MIL-T-8606 |
| ASTM A213 / ASME SA 213 | Standard Specification for 321 Stainless Steel Seamless Superheater, Condenser, Hydraulic, Boiler and Heat-Exchanger Tubes |
Shapes: Round, Rectangular, Square, Hydraulic, Straight, "U" Shape, Coiled, Honed Tubes, Pan Cake Coils
Manufacturing Type: Seamless / ERW / Welded / Fabricated / CDW / CDS / DOM / CEW / 100% X Ray Welded
Delivery Condition: Annealed and Pickled (AP), Polished, Bright Annealed (BA), Cold Drawn, MF
Surface Finish: BA, 2B, No.4, No.1, No.3, No.8, 8K, HL, 2D, 1D, Mirror Polished, 180G, 320G, 400G Satin/ Hairline, 400G, 500G, 600G or 800G Mirror finish or Custom Finish
Thickness Range: SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXH, SCH XXS, SCH XS
Standard: SUS, JIS, AISI, ASTM, GB, DIN, EN
Relevant Standard: ASTM A213, ASTM A312, ASTM A269, ASTM A778, ASTM A554, ASTM A249, ASTM A269, ASTM A270, ASTM A789, DIN 17456, DIN17457, DIN 17459, JIS G3459, JIS G3463, GOST9941, EN10216, BS3605, GB13296
Value Added Services
- Cutting
- Beveling
- Threading
- Polishing (Electro & Commercial)
- Draw & Expansion as per required Size & Length
- Destructive and Non Destructive Testing
- Ultrasonic Testing
- Annealed & Pickled Bending
SWG & BWG: 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg.
End Types: Plain End, Beveled End, Threaded SS 321 Tube
Processing Services: Bending, Welding, Decoiling, Punching, Cutting, Moulding
Manufacturing Technique: Cold drawn, Cold rolled, Hot rolled, Extrusion Tube
Tolerance
- Outer Diameter: +/- 0.2mm
- Thickness: +/- 10% OR as customer request
- Length: +/- 10mm
Marking
- Specification
- Material Grade
- Nominal Size
- Schedule or Wall Thickness
- Method of Manufacturing (Seamless / Welded)
- Heat Number
- Manufacturer's Name or Custom Logo - on request
Marked Pipe Sample: 321 Stainless Steel 12" NB SCH 40S SEAMLESS HEAT NO. XXXX
Test Certificate
- DFARS compliant
- EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- 100% Radiography Test Report
- Raw Materials Certificate
- Third Party Inspection Report
- Fumigation Certificates
- Heat Treatment Charts
- HS Code Commercial Invoice
- Form A for Generalized System of Preferences (GSP)
- Manufacturer Test Certificate
- Moisture testing
- Surface roughness measurement
- Laboratory Test Certificate from Govt. Approved Lab
Packaging: Packed in PE Fabric Bundles or ply wooden box wrapped in plastic or Standard seaworthy export packing or as per customers' request
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