-
-
-
Girgaon, Mumbai - 400004
Stainless Steel 321 Welded Pipes Manufacturer in India
What Are Stainless Steel 321 Welded Pipe?
Stainless Steel 321 Welded Pipe is an austenitic stainless steel pipe manufactured by forming stainless steel strip, sheet or plate into a tubular shape and joining the edges by welding. Grade 321 contains titanium as a stabilizing element, which helps reduce the risk of chromium-carbide precipitation during prolonged exposure to elevated temperatures.
Stainless Steel 321 Welded Pipes offer good corrosion resistance, weldability, strength and resistance to intergranular corrosion after exposure to elevated temperatures. They are commonly selected for high-temperature process piping, exhaust systems, heat-transfer equipment, chemical processing and other demanding industrial applications.
Kamal Steels is a Stainless Steel 321 Welded Pipe Manufacturer and Stockist in India, supplying pipes in different sizes, schedules, wall thicknesses, lengths, end preparations and surface finishes. Material Test Certificates, inspection documents, testing and export-standard packaging can be provided according to project and customer requirements.
Table of Contents
- Stainless Steel 321 Welded Pipe Specifications
- Features of Stainless Steel 321 Welded Pipes
- Stainless Steel 321 Welded Pipe Size Chart
- Stainless Steel 321 Welded Pipe Weight Chart
- Stainless Steel 321 Welded Pipe Schedule Chart
- ASTM A312 TP321 Welded Pipe
- Chemical Composition of Stainless Steel 321 Welded Pipe
- Mechanical Properties of Stainless Steel 321 Welded Pipe
- Equivalent Grades of Stainless Steel 321
- Stainless Steel 321 Welded Pipe vs Seamless Pipe
- Stainless Steel 321 Welded Pipe Applications
- Industries Using Stainless Steel 321 Welded Pipe
- Frequently Asked Questions
Stainless Steel 321 Welded Pipe Specifications
| Product | Stainless Steel 321 Welded Pipe |
|---|---|
| Material Grade | SS 321 / TP321 / UNS S32100 / EN 1.4541 |
| Standards | ASTM A312, ASTM A358, ASTM A778, ASME SA312 |
| Dimensions | ASME B36.19M, ASME B36.10M |
| Outside Diameter | 6 mm to 610 mm |
| Wall Thickness | 0.5 mm to 50 mm |
| Schedules | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XS, XXS |
| Pipe Type | ERW, EFW, Welded |
| Length | Single Random, Double Random, 6 Meter, Cut Length |
| End Type | Plain End, Bevel End, Threaded End |
| Surface Finish | Annealed & Pickled, BA, 2B, No.1, No.4, Mirror Finish |
| Testing | PMI, Hydrostatic Test, Radiography, Eddy Current, Flattening Test |
| Inspection | Third Party Inspection Available |
| Certification | EN 10204 3.1 Mill Test Certificate (MTC) |
| Applications | Heat Exchangers, Exhaust Systems, Process Piping, High Temperature Service |
Stainless Steel 321 Welded Pipes are titanium-stabilized austenitic stainless steel pipes manufactured for high-temperature and corrosion resistant applications. ASTM A312 TP321 Welded Pipes offer improved resistance to intergranular corrosion after exposure to elevated temperatures and are widely used in process industries, heat exchangers, power plants and thermal processing equipment.
Features of Stainless Steel 321 Welded Pipes
Stainless Steel 321 Welded Pipe Size Chart
| NPS / Size | Outside Diameter (mm) | Common Application |
|---|---|---|
| 1/8" | 10.3 | Instrumentation and small-bore piping |
| 1/4" | 13.7 | Small-bore process lines |
| 1/2" | 21.3 | Utility and process piping |
| 3/4" | 26.7 | Industrial piping |
| 1" | 33.4 | Process and utility lines |
| 1 1/2" | 48.3 | Industrial service piping |
| 2" | 60.3 | Fluid transfer |
| 3" | 88.9 | Process piping |
| 4" | 114.3 | Industrial piping |
| 6" | 168.3 | Large process lines |
| 8" | 219.1 | Plant and process piping |
| 10" | 273.1 | Large-diameter industrial piping |
| 12" | 323.9 | Process and utility systems |
Stainless Steel 321 Welded Pipes are available in different nominal sizes, outside diameters and wall thicknesses according to the applicable product and dimensional standards. Custom sizes and dimensions can be supplied subject to manufacturing capability and project requirements.
Stainless Steel 321 Welded Pipe Weight Chart
The theoretical weight of Stainless Steel 321 Welded Pipe depends on its outside diameter and wall thickness. Approximate weight can be calculated using the following formula:
Weight (kg/m) = (OD − WT) × WT × 0.02491
| NPS | Outside Diameter (mm) | Schedule | Wall Thickness (mm) | Approx. Weight (kg/m) |
|---|---|---|---|---|
| 1/2" | 21.34 | 10S | 2.11 | 1.01 |
| 1/2" | 21.34 | 40S | 2.77 | 1.28 |
| 3/4" | 26.67 | 10S | 2.11 | 1.29 |
| 1" | 33.40 | 10S | 2.77 | 2.11 |
| 1" | 33.40 | 40S | 3.38 | 2.54 |
| 1-1/2" | 48.26 | 10S | 2.77 | 3.15 |
| 1-1/2" | 48.26 | 40S | 3.68 | 4.08 |
| 2" | 60.33 | 10S | 2.77 | 3.99 |
| 2" | 60.33 | 40S | 3.91 | 5.49 |
| 3" | 88.90 | 10S | 3.05 | 6.53 |
| 3" | 88.90 | 40S | 5.49 | 11.40 |
| 4" | 114.30 | 10S | 3.05 | 8.46 |
| 4" | 114.30 | 40S | 6.02 | 16.24 |
The above values are approximate theoretical weights based on nominal dimensions. Actual weight can vary according to wall-thickness tolerance, manufacturing conditions, surface finish and supplied length.
Stainless Steel 321 Welded Pipe Schedule Chart
| Schedule | Wall Category | Typical Application |
|---|---|---|
| SCH 5S | Light Wall | Lightweight industrial and utility piping |
| SCH 10S | Light Wall | General process and industrial piping |
| SCH 40S | Medium Wall | General industrial and process applications |
| SCH 80S | Heavy Wall | Applications requiring greater wall thickness |
| SCH 160 | Extra Heavy Wall | Higher-wall industrial piping applications |
| XS | Extra Strong | Heavy-duty piping applications |
| XXS | Double Extra Strong | Very heavy-wall applications where specified |
Schedule selection depends on pipe size, wall thickness, design pressure, operating temperature, corrosion allowance, fluid service and the applicable piping design code.
ASTM A312 TP321 Welded Pipe
ASTM A312 TP321 Welded Pipe is a Type 321 austenitic stainless steel pipe supplied to ASTM A312 requirements for high-temperature and general corrosive service. TP321 is identified by UNS S32100 and is stabilized with titanium to improve resistance to chromium-carbide precipitation during elevated-temperature exposure.
ASTM A312 TP321 Welded Pipes are used where good corrosion resistance, weldability and elevated-temperature performance are required. Typical applications include process piping, heat-transfer equipment, chemical processing systems, power plants, exhaust systems and industrial fabrication.
Kamal Steels supplies ASTM A312 TP321 Welded Pipes in different nominal sizes, schedules, wall thicknesses, lengths and end configurations according to applicable specifications and project requirements.
Chemical Composition of Stainless Steel 321 Welded Pipe
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 Max |
| Manganese (Mn) | 2.00 Max |
| Silicon (Si) | 0.75 Max |
| Phosphorus (P) | 0.045 Max |
| Sulfur (S) | 0.030 Max |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–12.0 |
| Titanium (Ti) | 5 × C minimum to 0.70 Max |
| Nitrogen (N) | 0.10 Max |
| Iron (Fe) | Balance |
Chemical composition should be verified against the applicable material specification and the Material Test Certificate (MTC) supplied with the pipe.
Mechanical Properties of Stainless Steel 321 Welded Pipe
| Property | Minimum Requirement |
|---|---|
| Tensile Strength | 515 MPa minimum |
| Yield Strength | 205 MPa minimum |
| Elongation | 35% minimum |
The mechanical properties shown are minimum requirements generally associated with ASTM A312 TP321 pipe. Final values should be confirmed against the applicable specification, product condition and Material Test Certificate.
Equivalent Grades of Stainless Steel 321
| Standard | Equivalent Grade / Designation |
|---|---|
| UNS | S32100 |
| EN | 1.4541 |
| DIN | X6CrNiTi18-10 |
| JIS | SUS 321 |
| AFNOR | Z6CNT18-10 |
Stainless Steel 321 Welded Pipe vs Seamless Pipe
Stainless Steel 321 welded and seamless pipes are both available for industrial piping applications, but they differ in manufacturing process, dimensional availability and cost. The appropriate product should be selected according to the applicable specification and project requirements.
| Feature | SS 321 Welded Pipe | SS 321 Seamless Pipe |
|---|---|---|
| Manufacturing | Formed from strip, sheet or plate and joined by welding | Produced from a solid billet without a longitudinal weld seam |
| Weld Seam | Contains a longitudinal welded joint | No longitudinal welded joint |
| Large Diameter Availability | Generally offers good availability in larger diameters | Availability depends on seamless manufacturing capability |
| Cost | Often more economical for suitable applications | Generally higher manufacturing cost |
| Typical Use | Process piping, fabrication and general industrial applications | Applications where seamless construction is specified or required |
Neither welded nor seamless construction alone determines pressure suitability. Selection should consider pipe dimensions, wall thickness, operating pressure, temperature, fluid service, applicable product specification and piping design code.
Stainless Steel 321 Welded Pipe Applications
| Application | Typical Use |
|---|---|
| Process Piping | High-temperature process and fluid-transfer piping |
| Pressure Lines | Industrial pressure piping where the applicable design requirements are met |
| Heat Exchangers | Process connections and high-temperature equipment systems |
| Boiler Systems | Selected high-temperature auxiliary and process piping applications |
| Instrumentation | Instrument and process lines exposed to elevated temperatures |
| Structural Fabrication | Industrial frames, supports and fabricated components |
| Water Lines | Selected industrial water and utility systems |
| Steam Distribution | High-temperature steam and condensate service where specification permits |
Industries Using Stainless Steel 321 Welded Pipe
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Process piping and high-temperature utility systems |
| Petrochemical | Process lines and plant piping |
| Chemical | Corrosive-service and elevated-temperature process systems |
| Pharmaceutical | Process and utility piping |
| Food Processing | Process and hygienic piping applications |
| Marine | Selected marine equipment and fabrication applications |
| Water Treatment | Industrial water and utility piping |
| LNG | Selected process and utility piping applications |
| Power Plant | High-temperature utility and process systems |
| Sugar Plant | Process piping and equipment fabrication |
| Mining | Industrial fluid handling and process systems |
| Desalination | Selected water-treatment and process applications |
Frequently Asked Questions
Stainless Steel 321 Welded Pipe is manufactured by forming stainless steel strip, sheet or plate into a cylindrical shape and joining the edges by welding. Grade 321 is a titanium-stabilized austenitic stainless steel that provides good corrosion resistance and is suitable for elevated-temperature applications.
ASTM A312 TP321 Welded Pipe is a Type 321 austenitic stainless steel pipe manufactured according to ASTM A312 requirements. TP321 is commonly identified by UNS S32100 and is used for general corrosive service and applications involving elevated temperatures.
Stainless Steel 321 Welded Pipes offer good corrosion resistance, high-temperature performance, good weldability, strength, durability and resistance to intergranular corrosion after certain elevated-temperature exposures. The titanium stabilization of Grade 321 makes it suitable for selected high-temperature industrial applications.
SS 321 contains titanium as a stabilizing element, while SS 304 does not have intentional titanium stabilization. SS 321 is often preferred for applications involving elevated temperatures and conditions where resistance to intergranular corrosion after heating is important. SS 304 is widely used for general corrosion-resistant applications.
Stainless Steel 321 Welded Pipes are available in a wide range of nominal sizes, outside diameters and wall thicknesses. Common schedules include SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XS and XXS, subject to size and manufacturing availability.
Stainless Steel 321 Welded Pipes are used in high-temperature process piping, heat-transfer systems, petrochemical plants, chemical processing, power generation, oil and gas facilities, furnace equipment and other industrial applications requiring stabilized austenitic stainless steel.
Stainless Steel 321 typically contains chromium, nickel and titanium, with controlled levels of carbon, manganese, silicon, phosphorus, sulfur and nitrogen. The titanium stabilization is an important characteristic of Grade 321. Final chemical composition should be verified against the applicable material specification and Material Test Certificate (MTC).
The price of Stainless Steel 321 Welded Pipe depends on the required size, schedule, wall thickness, quantity, length, surface finish, testing, certification, delivery location and prevailing stainless steel market conditions. Contact Kamal Steels with your required specifications and quantity for the latest quotation.
Yes. Stainless Steel 321 Welded Pipes can be supplied with applicable Material Test Certificates, including EN 10204 Type 3.1 documentation where specified. PMI, hydrostatic testing, nondestructive testing and Third-Party Inspection can also be arranged according to project requirements.
Yes. Stainless Steel 321 Welded Pipes can be supplied in different sizes, wall thicknesses, schedules, lengths, end preparations and surface finishes. Custom requirements can be accommodated subject to manufacturing capability and applicable specifications.