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Girgaon, Mumbai - 400004
Stainless Steel 304H Seamless Tubes Manufacturer in India
What Are Stainless Steel 304H Seamless Tubes?
Stainless Steel 304H Seamless Tubes are high-carbon austenitic stainless steel tubes developed for applications where good corrosion resistance must be combined with enhanced strength at elevated temperatures. Grade 304H is identified by UNS S30409 and is a higher-carbon version of the conventional 304 stainless steel family.
The controlled carbon content of 304H provides improved high-temperature strength and creep resistance compared with lower-carbon variants. Its chromium and nickel content also provides resistance to oxidation and general corrosion, allowing the material to perform reliably in demanding process and thermal environments.
Stainless Steel 304H Seamless Tubes are supplied according to applicable ASTM and ASME specifications. ASTM A213 and ASME SA213 are commonly associated with seamless austenitic stainless steel tubes used for boiler, superheater and heat-exchanger service. Tube dimensions, schedules, lengths and finishes can be selected according to project requirements.
These tubes are commonly used in heat exchangers, boilers, petrochemical equipment, refinery systems, power-generation plants, chemical processing equipment and high-temperature process lines. Their combination of elevated-temperature strength, corrosion resistance and seamless construction makes them suitable for demanding industrial service.
Kamal Steels is a Manufacturer and Stockist of Stainless Steel 304H Seamless Tubes, offering different outside diameters, wall thicknesses, lengths and surface finishes for domestic and international requirements. Material Test Certificates and inspection documentation can be supplied according to customer specifications.
Table of Contents
- Stainless Steel 304H Seamless Tube Specifications
- Stainless Steel 304H Seamless Tube Size Chart
- Stainless Steel 304H Seamless Tube Standards
- Stainless Steel 304H Seamless Tube Features
- Stainless Steel 304H Chemical Composition
- Stainless Steel 304H Mechanical Properties
- Stainless Steel 304H Seamless Tube Applications
- Industries Using Stainless Steel 304H Seamless Tubes
- Frequently Asked Questions
Stainless Steel 304H Seamless Tube Specifications
| Specification | Stainless Steel 304H Seamless Tubes |
|---|---|
| Material | Stainless Steel |
| Grade | 304H |
| UNS | S30409 |
| Tube Type | Seamless |
| ASTM Standard | ASTM A213, Applicable ASTM Specifications |
| ASME Standard | ASME SA213, Applicable ASME Specifications |
| Outside Diameter | As per requirement |
| Wall Thickness | As per requirement |
| Schedule | As required |
| Length | Random, Fixed or Customized |
| Finish | Annealed, Pickled, Bright Annealed, Polished or As required |
| Form | Round Tube |
Stainless Steel 304H Seamless Tube Size Chart
Stainless Steel 304H Seamless Tubes can be supplied in different diameters and wall thicknesses for heat-transfer, process equipment and high-temperature industrial applications.
| Tube Size | Outside Diameter (mm) | Wall Thickness | Length |
|---|---|---|---|
| 1/2" | 12.70 | As required | As required |
| 3/4" | 19.05 | As required | As required |
| 1" | 25.40 | As required | As required |
| 1-1/2" | 38.10 | As required | As required |
| 2" | 50.80 | As required | As required |
| 3" | 76.20 | As required | As required |
| 4" | 101.60 | As required | As required |
| 6" | 152.40 | As required | As required |
| 8" | 203.20 | As required | As required |
Stainless Steel 304H Seamless Tube Standards
| Standard | Application / Product Requirement |
|---|---|
| ASTM A213 | Seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes |
| ASTM A269 | Austenitic stainless steel tubing for general corrosion-resisting service, where applicable |
| ASME SA213 | Applicable seamless ferritic and austenitic alloy-steel tubing requirements |
| ASME SA269 | Applicable austenitic stainless steel tubing requirements for general service, where applicable |
Stainless Steel 304H Seamless Tube Features
- Higher carbon content for improved elevated-temperature strength
- Good resistance to oxidation and general corrosion
- Strong performance under prolonged thermal exposure
- Good creep and stress-rupture characteristics
- Excellent toughness and structural stability
- Good resistance to many industrial environments
- Suitable for heat-transfer equipment
- Seamless construction for demanding service conditions
- Good fabrication and machining characteristics
- Available in multiple sizes and finishes
Stainless Steel 304H Chemical Composition
| Element | Composition (%) |
|---|---|
| Chromium | 18.0 - 20.0 |
| Nickel | 8.0 - 11.0 |
| Carbon | 0.04 - 0.10 |
| Manganese | 2.00 max. |
| Silicon | 1.00 max. |
| Phosphorus | 0.045 max. |
| Sulfur | 0.030 max. |
| Iron | Balance |
Stainless Steel 304H Mechanical Properties
| Property | Minimum Requirement |
|---|---|
| Tensile Strength | 515 MPa min. |
| Yield Strength | 205 MPa min. |
| Elongation | 40% min. |
| Density | Approx. 8.0 g/cm³ |
Note: Mechanical requirements should be confirmed against the applicable ASTM or ASME product specification and material test certificate.
Stainless Steel 304H Seamless Tube Applications
Heat Exchangers
Used in heat-transfer equipment where elevated-temperature strength and corrosion resistance are required.
Boiler Systems
Applied in suitable boiler and thermal equipment operating under elevated temperatures.
Petrochemical Equipment
Selected for process equipment exposed to heat, pressure and industrial process media.
Chemical Processing
Used in selected chemical process systems requiring corrosion-resistant high-temperature tubing.
Power Generation
Suitable for high-temperature heat-transfer and process equipment in power facilities.
Refinery Systems
Applied in appropriate refinery equipment exposed to demanding thermal operating conditions.
Industries Using Stainless Steel 304H Seamless Tubes
Petrochemical Industry
Uses 304H tubing in selected high-temperature process and heat-transfer equipment.
Chemical Industry
Applied in process equipment where corrosion resistance and thermal performance are important.
Power Industry
Used in suitable thermal equipment and heat-transfer systems.
Boiler Industry
Selected for boiler and associated equipment requiring austenitic stainless steel tubing.
Refining Industry
Applied in refinery systems subjected to elevated-temperature process conditions.
Engineering Industry
Used for specialized equipment and industrial systems requiring 304H seamless tubing.
Frequently Asked Questions
Stainless Steel 304H Seamless Tubes are high-temperature, weld-free stainless steel tubes manufactured from Stainless Steel 304H (UNS S30409 / WNR 1.4948). They offer improved creep strength, excellent oxidation resistance, and reliable performance under elevated temperatures.
Our Stainless Steel 304H Seamless Tubes are manufactured according to ASTM A213, ASTM A269, ASME SA213, and ASME SA269 international standards.
SS 304H contains a higher carbon content than SS 304, providing improved creep strength and better mechanical stability at elevated temperatures, making it more suitable for high-temperature service.
They are widely used in boilers, superheaters, heat exchangers, refineries, petrochemical plants, power generation facilities, steam pipelines, thermal processing equipment, and chemical processing industries.
SS 304H Seamless Tubes are available in various outside diameters, wall thicknesses, surface finishes, schedules, and custom cut lengths to meet diverse industrial requirements.
Each tube undergoes Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ECT), Positive Material Identification (PMI), Chemical Analysis, Mechanical Testing, Flattening Test, Flaring Test, and Dimensional Inspection.
Yes. SS 304H Seamless Tubes are specifically designed for elevated-temperature service and provide excellent oxidation resistance, creep strength, and long-term structural stability.
Yes. Every shipment includes EN 10204 3.1 Mill Test Certificates, inspection reports, complete material traceability, and third-party inspection certificates upon request.
Yes. Kamal Steels exports Stainless Steel 304H Seamless Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Stainless Steel 304H Seamless Tubes with ready stock, certified quality, competitive pricing, strict quality control, export-standard packaging, complete documentation, and dependable worldwide delivery for critical industrial applications.