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Girgaon, Mumbai - 400004
Stainless Steel 321H Welded Pipes Manufacturer in India
What are Stainless Steel 321H Welded Pipe?
Stainless Steel 321H 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 321H is a titanium-stabilized stainless steel with a higher carbon content than Grade 321, developed to provide improved creep and rupture strength at elevated temperatures while maintaining good resistance to sensitization.
Stainless Steel 321H Welded Pipes offer good corrosion resistance, high-temperature strength, weldability and resistance to oxidation in elevated-temperature service. They are commonly selected for high-temperature process piping, furnace components, heat exchangers, thermal processing equipment, exhaust systems, chemical processing and other applications where sustained elevated-temperature performance is required.
Kamal Steels is a Stainless Steel 321H 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 321H Welded Pipe Specifications
- Stainless Steel 321H Welded Pipe Weight Chart
- Stainless Steel 321H Welded Pipe Size Range
- Stainless Steel 321H Welded Pipe Schedules
- Surface Finish of Stainless Steel 321H Welded Pipes
- Stainless Steel 321H vs 321 Welded Pipe
- Stainless Steel 321H Welded Pipe Manufacturing Standards
- Stainless Steel 321H Welded Pipe Chemical Composition
- Mechanical Properties of Stainless Steel 321H Welded Pipe
- Equivalent Grades of Stainless Steel 321H Welded Pipe
- Features of Stainless Steel 321H Welded Pipes
- Applications of Stainless Steel 321H Welded Pipes
- Industries Using Stainless Steel 321H Welded Pipe
- Frequently Asked Questions
Stainless Steel 321H Welded Pipe Specifications
| Product | Stainless Steel 321H Welded Pipe |
|---|---|
| Material Grade | 321H (UNS S32109) |
| Manufacturing Standard | ASTM A312 / ASME SA312 |
| Outside Diameter | 1/8" NB to 24" NB (6 mm to 610 mm) |
| Wall Thickness | SCH 5S to SCH XXS |
| Pipe Type | Welded, ERW, EFW & Fabricated |
| Length | Single Random, Double Random & Custom Cut Length |
| End Type | Plain End, Beveled End & Threaded |
| Surface Finish | Annealed & Pickled, Bright Annealed, 2B, No.1 & Polished |
| Inspection | Hydro Test, PMI, Radiography, Eddy Current Test & EN 10204 3.1 MTC |
Stainless Steel 321H Welded Pipe Weight Chart
The weight of Stainless Steel 321H Welded Pipes depends on the outside diameter, wall thickness and pipe length. The following chart provides approximate theoretical weight values for commonly used pipe sizes. Actual weight may vary depending on manufacturing tolerances and dimensional requirements.
| Nominal Pipe Size | Outside Diameter | Wall Thickness | Approx. Weight |
|---|---|---|---|
| 1/2" NB | 21.3 mm | 2.77 mm | 1.27 kg/m |
| 1" NB | 33.4 mm | 3.38 mm | 2.54 kg/m |
| 2" NB | 60.3 mm | 3.91 mm | 5.32 kg/m |
| 3" NB | 88.9 mm | 5.49 mm | 11.29 kg/m |
| 4" NB | 114.3 mm | 6.02 mm | 16.31 kg/m |
| 6" NB | 168.3 mm | 7.11 mm | 28.83 kg/m |
| 8" NB | 219.1 mm | 8.18 mm | 43.42 kg/m |
| 10" NB | 273.0 mm | 9.27 mm | 60.76 kg/m |
| 12" NB | 323.9 mm | 9.53 mm | 72.92 kg/m |
For exact Stainless Steel 321H Welded Pipe weight, the outside diameter, wall thickness and required length should be considered. Weight can also vary according to the applicable dimensional standard and manufacturing tolerance.
Stainless Steel 321H Welded Pipe Size Range
Kamal Steels offers Stainless Steel 321H Welded Pipes in a comprehensive range of sizes to meet the requirements of high-temperature piping systems across various industries. We also manufacture customized pipes based on customer drawings and project specifications.
Available Pipe Schedules
| Pipe Schedule | Availability |
|---|---|
| SCH 5S | Available |
| SCH 10S | Available |
| SCH 20 | Available |
| SCH 40S | Available |
| SCH 60 | Available |
| SCH 80S | Available |
| SCH 120 | Available |
| SCH 160 | Available |
| XS | Available |
| XXS | Available |
Surface Finish of Stainless Steel 321H Welded Pipes
To meet the performance and finishing requirements of different industries, Kamal Steels supplies Stainless Steel 321H Welded Pipes in a variety of surface finishes. Each finish enhances corrosion resistance, durability, and appearance while ensuring reliable service in demanding environments.
| Surface Finish | Description |
|---|---|
| Annealed & Pickled (AP) | Provides a clean surface with improved corrosion resistance after heat treatment. |
| Bright Annealed (BA) | Smooth and bright finish suitable for precision engineering applications. |
| 2B Finish | Standard industrial finish commonly used for fabrication and processing equipment. |
| No.1 Finish | Hot rolled finish recommended for high-temperature industrial service. |
| Polished Finish | Ideal for hygienic, pharmaceutical, food processing, and decorative applications. |
Stainless Steel 321H vs 321 Welded Pipe
Stainless Steel 321 and 321H are titanium-stabilized austenitic stainless steel grades with similar chromium, nickel and titanium characteristics. The main difference is the controlled carbon content. Stainless Steel 321H has a higher carbon range, which provides improved high-temperature strength and makes it particularly suitable for applications involving sustained elevated-temperature service.
| Property | Stainless Steel 321 | Stainless Steel 321H |
|---|---|---|
| UNS Number | S32100 | S32109 |
| Carbon Content | Lower carbon grade | Higher carbon grade |
| Stabilizing Element | Titanium | Titanium |
| High-Temperature Strength | Good | Improved |
| Creep Resistance | Good | Better suited for sustained elevated-temperature service |
| Corrosion Resistance | Good | Good |
| Weldability | Good | Good |
| Typical Application | General high-temperature and corrosive service | High-temperature service requiring improved strength |
In applications where elevated-temperature strength and long-term structural stability are important, Stainless Steel 321H can be selected over standard 321. The final grade selection should be based on operating temperature, pressure, corrosion environment, design requirements and applicable material specifications.
Stainless Steel 321H Welded Pipe Manufacturing Standards
All Stainless Steel 321H Welded Pipes manufactured by Kamal Steels comply with globally recognized standards to ensure excellent dimensional accuracy, mechanical strength, corrosion resistance, and dependable performance in critical industrial applications.
| Standard | Description |
|---|---|
| ASTM A312 | Specification for seamless, welded and heavily cold-worked austenitic stainless steel pipes. |
| ASME SA312 | Pressure piping specification for stainless steel welded pipes. |
| ASTM A358 | Electric fusion welded austenitic chromium-nickel stainless steel pipes. |
| ASTM A778 | Specification covering welded austenitic stainless steel tubular products. |
| ASME B36.19M | Dimensions and tolerances for stainless steel pipes. |
| ASME B36.10M | Standard dimensions for welded and seamless steel pipes. |
Stainless Steel 321H Welded Pipe Chemical Composition
Stainless Steel 321H contains a controlled higher carbon content and titanium stabilization, providing excellent resistance to oxidation, intergranular corrosion, and improved creep strength at elevated temperatures.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | 2.00 Max |
| Silicon (Si) | 1.00 Max |
| Phosphorus (P) | 0.045 Max |
| Sulfur (S) | 0.030 Max |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 12.00 |
| Titanium (Ti) | 5 × (C+N) Min – 0.70 Max |
| Nitrogen (N) | 0.10 Max |
| Iron (Fe) | Balance |
Mechanical Properties of Stainless Steel 321H Welded Pipe
Stainless Steel 321H Welded Pipes are engineered to provide reliable mechanical strength and long-term stability in high-temperature operating conditions.
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa Minimum |
| Yield Strength (0.2% Offset) | 205 MPa Minimum |
| Elongation | 40% Minimum |
| Hardness | 95 HRB Maximum |
| Density | 7.90 g/cm³ |
| Melting Range | 1398 – 1454°C |
Equivalent Grades of Stainless Steel 321H Welded Pipe
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 321H |
| UNS | S32109 |
| Werkstoff No. | 1.4940 |
| EN | X8CrNiTi18-10 |
| JIS | SUS 321H |
| ISO | 321H |
Features of Stainless Steel 321H Welded Pipes
Stainless Steel 321H Welded Pipe Applications
| Application | Typical Use |
|---|---|
| High-Temperature Process Piping | Process and fluid-transfer piping exposed to elevated temperatures |
| Heat Exchangers | Process connections and high-temperature heat-transfer systems |
| Furnace Piping | Piping and components operating under prolonged high-temperature conditions |
| Boiler & Superheater Systems | Selected high-temperature steam, auxiliary and process piping systems |
| Thermal Processing Equipment | Piping and equipment used in heat-treatment and thermal processing operations |
| Exhaust Systems | High-temperature exhaust piping and expansion system components |
| Pressure Piping | Industrial pressure piping where elevated-temperature performance is required |
| Chemical Process Equipment | Process piping exposed to corrosive and elevated-temperature environments |
Industries Using Stainless Steel 321H Welded Pipe
| Industry | Typical Applications |
|---|---|
| Oil & Gas | High-temperature process piping, refinery systems and thermal service applications |
| Petrochemical | Process lines, heat-transfer systems and high-temperature plant piping |
| Chemical Processing | Corrosive-service piping and elevated-temperature process equipment |
| Power Generation | Boiler, superheater, heat-transfer and high-temperature utility systems |
| Refinery | Process piping, furnace systems and high-temperature equipment |
| Heat Exchanger Manufacturing | Heat-transfer equipment and process connection systems |
| Fertilizer | Process piping and equipment operating under elevated-temperature conditions |
| Pharmaceutical | Selected process and utility piping requiring corrosion-resistant materials |
| Aerospace | Selected high-temperature piping, exhaust and fabricated components |
| Industrial Manufacturing | Thermal processing equipment, furnace systems and fabricated process components |
Frequently Asked Questions
Stainless Steel 321H Welded Pipe is a high-carbon, titanium-stabilized austenitic stainless steel pipe developed for elevated temperature applications requiring excellent oxidation resistance and improved creep strength.
SS 321H contains a higher carbon content than SS 321, which improves its creep resistance and mechanical strength during prolonged exposure to high temperatures.
Kamal Steels manufactures SS 321H Welded Pipes in accordance with ASTM A312, ASME SA312, ASTM A358, ASTM A778, ASME B36.19M, and other applicable international standards.
We supply Stainless Steel 321H Welded Pipes from 1/8" NB to 24" NB in multiple schedules, wall thicknesses, and customized lengths based on customer requirements.
These pipes are widely used in refineries, petrochemical plants, power stations, boilers, superheaters, heat exchangers, furnace equipment, and high-temperature process piping systems.
Yes. Their titanium stabilization and higher carbon content make them suitable for continuous service at elevated temperatures while maintaining excellent mechanical properties.
Each pipe undergoes Hydrostatic Testing, Positive Material Identification (PMI), Radiographic Testing, Eddy Current Testing, Visual Inspection, and Dimensional Verification before dispatch.
Yes. Kamal Steels provides EN 10204 3.1 Mill Test Certificates with every shipment. Third-party inspection can also be arranged if required.
Yes. We manufacture customized pipes in various diameters, wall thicknesses, schedules, lengths, surface finishes, and end preparations according to project specifications.
Kamal Steels offers premium-quality Stainless Steel 321H Welded Pipes manufactured to international standards, backed by strict quality control, certified materials, competitive pricing, timely delivery, and reliable technical support for domestic and international customers.