Girgaon, Mumbai - 400004
Stainless Steel 304H Welded Pipe is a high-carbon austenitic stainless steel pipe manufactured by forming stainless steel strip or plate into a tubular shape and joining the longitudinal seam by welding. The 304H grade contains chromium and nickel and has a higher carbon content than 304L, providing properties suited to elevated-temperature service.
304H Welded Pipe is used where corrosion resistance, mechanical strength and high-temperature performance are required. It is commonly considered for process piping, heat-related industrial systems, chemical equipment, power generation and other applications where the material must operate under elevated temperatures.
Kamal Steels is a Stainless Steel 304H Welded Pipe Manufacturer and Stockist in India, based in Mumbai. The company supplies 304H welded pipes in different sizes, schedules, wall thicknesses, lengths and finishes according to customer and project requirements.
The commonly specified pressure-piping designation is ASTM A312 TP304H / ASME SA312 TP304H, with UNS designation S30409. Pipes can be supplied with applicable testing, inspection and material documentation according to project requirements.
Stainless Steel 304H Welded Pipe is a high-carbon austenitic stainless steel pipe designed for applications requiring good corrosion resistance and enhanced high-temperature strength. The 304H grade is a higher-carbon version of the 304 stainless steel family and is commonly specified for elevated-temperature service.
ASTM A312 TP304H is a commonly specified material designation for 304H stainless steel pipe used in pressure and high-temperature applications. The welded pipes are available in different nominal sizes, schedules, wall thicknesses, lengths and surface conditions according to applicable ASTM, ASME and project requirements.
| Specification | Details |
|---|---|
| Product | Stainless Steel 304H Welded Pipe |
| Grade | 304H / Type 304H |
| UNS Number | S30409 |
| ASTM Specification | ASTM A312 |
| ASME Specification | ASME SA312 |
| Material Type | Austenitic Stainless Steel |
| Pipe Type | Welded |
| Manufacturing Process | Formed Stainless Steel Strip / Plate with Welded Seam |
| Nominal Size | 1/8 NB to 48 NB and as required |
| Schedules | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XXS and others |
| Length | Single Random, Double Random and Cut Length |
| End Preparation | Plain End, Bevelled End, Threaded End and as required |
| Surface Finish | Annealed & Pickled, Mill Finish, Bright Annealed and Polished |
| Testing | Hydrostatic, Ultrasonic, PMI, Dimensional Inspection and other specified tests |
| Material Certificate | EN 10204 3.1 Certificate available as required |
Kamal Steels supplies Stainless Steel 304H Welded Pipes in standard and project-specific sizes, schedules, wall thicknesses and lengths. Testing, inspection, material certification and export packaging can be provided according to applicable standards and customer requirements.
The chemical composition of Stainless Steel 304H provides the austenitic structure and corrosion resistance associated with the 304 stainless steel family while maintaining a higher carbon level than 304L. Chromium provides the passive oxide layer responsible for stainless steel corrosion resistance, while nickel helps stabilize the austenitic structure.
The controlled carbon content of 304H distinguishes it from the low-carbon 304L grade and makes 304H suitable for specified elevated-temperature applications. The exact chemical requirements should always be verified against the applicable ASTM specification and material test certificate.
| 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) | 18.0–20.0 |
| Nickel (Ni) | 8.0–11.0 |
| Iron (Fe) | Balance |
The higher carbon range is an important characteristic of 304H and is one of the reasons the grade is selected for certain elevated-temperature services. Actual composition should be confirmed from the applicable material specification and supplied material test certificate.
Stainless Steel 304H Welded Pipes are available in different nominal pipe sizes, outside diameters and wall thicknesses to meet industrial process and high-temperature piping requirements. The required dimensions are selected according to nominal pipe size, applicable dimensional standards, design pressure, temperature and project requirements.
Pipe wall thickness is commonly identified by schedule. Common schedules include SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160 and XXS, subject to pipe size and availability. Heavier schedules provide greater wall thickness and may be selected where higher mechanical or pressure requirements apply.
| Nominal Pipe Size | Outside Diameter | Common Schedules |
|---|---|---|
| 1/8 NB | 10.3 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 1/4 NB | 13.7 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 1/2 NB | 21.3 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 1 NB | 33.4 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 1 1/2 NB | 48.3 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 2 NB | 60.3 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 3 NB | 88.9 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 4 NB | 114.3 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S |
| 6 NB | 168.3 mm | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160 |
| 8 NB | 219.1 mm | SCH 10S, SCH 40S, SCH 80S, SCH 160 |
| 10 NB | 273.1 mm | SCH 10S, SCH 40S, SCH 80S, SCH 160 |
| 12 NB | 323.9 mm | SCH 10S, SCH 40S, SCH 80S, SCH 160 |
| 14 NB | 355.6 mm | SCH 10S, SCH 40S, SCH 80S |
| 16 NB | 406.4 mm | SCH 10S, SCH 40, SCH 80 |
| 18 NB | 457.2 mm | SCH 10S, SCH 40, SCH 80 |
| 20 NB | 508.0 mm | SCH 10S, SCH 40, SCH 80 |
| 24 NB | 610.0 mm | SCH 10S, SCH 40, SCH 80 |
Kamal Steels supplies Stainless Steel 304H Welded Pipes in standard and custom sizes, schedules, wall thicknesses and lengths according to applicable standards, customer drawings and project specifications.
ASTM A312 TP304H Welded Pipes are manufactured with controlled dimensional requirements for outside diameter, wall thickness, length and other applicable dimensions. Maintaining dimensional consistency is important for pipe fit-up, welding, fabrication and installation in industrial piping systems.
| Parameter | Requirement |
|---|---|
| Outside Diameter | Controlled according to applicable ASTM A312 dimensional requirements and specified pipe size. |
| Wall Thickness | Controlled according to the specified nominal thickness and applicable standard requirements. |
| Length | Available in standard random, double random or specified cut lengths. |
| Ovality | Controlled to maintain acceptable pipe roundness and dimensional consistency. |
| End Preparation | Plain, bevelled or other specified end preparation. |
Dimensional inspection can be performed to verify outside diameter, wall thickness, length and other applicable requirements. For critical projects, additional inspection and testing can be specified by the purchaser.
Kamal Steels supplies ASTM A312 TP304H Welded Pipes according to applicable dimensional requirements with options for specified sizes, schedules, wall thicknesses, lengths, testing and material certification.
The pressure capability of Stainless Steel 304H Welded Pipe depends on pipe outside diameter, wall thickness, operating temperature, allowable material stress and the applicable piping design code. The 304H grade is often selected for elevated-temperature service, but the maximum allowable working pressure must be established from the complete design conditions.
| Factor | Effect on Pressure Design |
|---|---|
| Pipe Size | Outside diameter is considered in pressure design calculations. |
| Wall Thickness | A thicker wall generally provides greater pressure carrying capability. |
| Pipe Schedule | Different schedules provide different nominal wall thicknesses. |
| Operating Temperature | Allowable material stress changes with service temperature. |
| Design Code | The applicable piping code determines the design methodology and allowable stresses. |
| Corrosion Allowance | Additional wall thickness may be required where corrosion or erosion is expected. |
For high-temperature and pressure-service applications, the required wall thickness and allowable pressure should be determined through project-specific engineering calculations. The applicable ASTM, ASME and piping design requirements should be confirmed before selecting the final pipe schedule.
Stainless Steel 304H is identified by different designations under international material systems. These designations assist procurement teams, engineers and manufacturers when identifying the material across different standards.
| Standard | 304H Designation |
|---|---|
| ASTM | 304H |
| ASME | SA312 TP304H |
| UNS | S30409 |
| EN | 1.4948 |
Equivalent designations should not automatically be treated as interchangeable for every application. Chemical composition, mechanical properties, heat treatment, manufacturing requirements, testing and applicable code requirements should be verified before material substitution.
The surface finish of Stainless Steel 304H Welded Pipe is selected according to manufacturing requirements and the intended application. Industrial piping generally uses standard mill or annealed and pickled conditions, while specialized applications may require brighter or polished surfaces.
| Surface Finish | Description | Typical Application |
|---|---|---|
| Annealed & Pickled | Heat-treated and chemically cleaned surface. | Industrial process piping |
| Mill Finish | Standard surface obtained during manufacturing. | General industrial applications |
| Bright Annealed | Bright and smooth surface produced by controlled annealing. | Process and specialized applications |
| Polished | Mechanically finished surface with improved smoothness. | Food, pharmaceutical and specialized applications |
The required surface condition should be specified according to the operating environment, cleaning requirements, fabrication process and final application. Kamal Steels can supply 304H Welded Pipes with the specified surface condition according to customer and project requirements.
Stainless Steel 304H Welded Pipes are used in applications where corrosion resistance and elevated-temperature performance are important. The grade is particularly considered for industrial systems operating at temperatures where the higher-carbon 304H composition is appropriate.
| Application | Typical Use |
|---|---|
| High-Temperature Process Piping | Process lines operating at elevated temperatures |
| Power Generation | Selected high-temperature piping and utility systems |
| Chemical Processing | Process piping and chemical handling systems |
| Petrochemical | Process and fluid-handling systems |
| Heat-Related Equipment | Selected piping and equipment operating at elevated temperatures |
| Industrial Engineering | Fabrication and high-temperature industrial systems |
| Process Plants | Corrosion-resistant process and utility piping |
The suitability of 304H for a particular application should be evaluated against operating temperature, pressure, corrosion conditions, welding requirements and the applicable design code.
Stainless Steel 304H Welded Pipes are used across industries requiring stainless steel piping with corrosion resistance and performance at elevated temperatures. Selection of the grade, pipe schedule, dimensions and testing requirements depends on the specific operating conditions.
| Industry | Typical Use |
|---|---|
| Power Generation | High-temperature process and utility piping |
| Petrochemical | Process piping and elevated-temperature systems |
| Chemical Processing | Corrosive fluid and process piping |
| Oil & Gas | Selected process and high-temperature piping systems |
| Process Engineering | Industrial process equipment and piping |
| Industrial Manufacturing | Fabricated equipment and process systems |
| Heat & Energy Systems | Selected elevated-temperature piping applications |
Kamal Steels supplies Stainless Steel 304H Welded Pipes from India for domestic and international industrial requirements. Pipes can be supplied in different sizes, schedules, wall thicknesses, lengths, finishes, testing conditions and material documentation according to project requirements.
Stainless Steel 304H Welded Pipe is a high-carbon austenitic stainless steel pipe specifically designed for elevated temperature applications. It provides excellent oxidation resistance, improved creep strength and reliable performance in high-pressure and high-temperature environments.
The main difference is the carbon content. Stainless Steel 304H contains a higher carbon level than standard 304, which enhances high-temperature strength, creep resistance and durability in continuous heat service.
SS 304H Welded Pipes are manufactured according to ASTM A312, ASTM A358, ASTM A778, ASME SA312, ASME B36.19M and ASME B36.10M standards to ensure superior quality and dimensional accuracy.
Stainless Steel 304H Welded Pipes are available from 1/8" NB to 24" NB in schedules including SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XS, and XXS. Custom sizes and lengths are also available.
These pipes offer excellent oxidation resistance, superior high-temperature strength, enhanced creep resistance, good weldability, excellent mechanical properties and long service life in demanding industrial environments.
SS 304H Welded Pipes are widely used in boilers, heat exchangers, power plants, petrochemical industries, refineries, pressure vessels, chemical processing plants and other high-temperature process piping systems.
Each pipe undergoes Hydrostatic Testing, PMI (Positive Material Identification), Radiographic Testing, Eddy Current Testing, Flattening Test, Visual Inspection and Dimensional Inspection to ensure compliance with international standards.
Yes. Stainless Steel 304H Welded Pipes are supplied with EN 10204 3.1 Mill Test Certificates (MTC). Third-party inspection certificates are also available upon customer request.
Yes. We supply customized outside diameters, wall thicknesses, schedules, lengths, end preparations and surface finishes according to project specifications.
Kamal Steels is a trusted manufacturer, supplier, stockist, and exporter of Stainless Steel 304H Welded Pipes. We offer premium quality products, certified raw materials, competitive pricing, strict quality control, fast delivery, complete documentation and reliable worldwide export services.