Stainless Steel 304H Seamless Pipes

What is Stainless Steel 304H Seamless Pipe?

Stainless Steel 304H Seamless Pipe is manufactured from high-carbon austenitic stainless steel Grade 304H and is produced without a longitudinal welded joint. The seamless manufacturing process begins with a solid steel billet, which is pierced and formed into a hollow section before being processed to achieve the specified outside diameter, wall thickness and dimensional requirements.

Kamal Steels supplies Stainless Steel 304H Seamless Pipe and ASTM A312 TP304H Seamless Pipe in various sizes, schedules, wall thicknesses, lengths and finishes for industrial piping and high-temperature service applications. Grade 304H is valued for its combination of corrosion resistance, strength and improved performance at elevated temperatures, making it suitable for demanding process and thermal applications.

Stainless Steel 304H Seamless Pipe Specifications

Table of Contents

SS 304H Seamless Pipe Specifications

Specification Details
Product Name Stainless Steel 304H Seamless Pipe
Grade SS 304H / Type 304H
UNS S30409
EN Grade 1.4948
Material Type Austenitic Stainless Steel
Manufacturing Process Seamless
Product Standard ASTM A312
ASME Specification ASME SA312
Size Range 1/8" to 24" and above as required
Schedule 5S, 10S, 40S, 80S, 160 and other schedules
Wall Thickness As per applicable schedule or specified requirement
Length Random, Double Random or Fixed Length
End Type Plain End, Bevelled End or Threaded End as required
Surface Finish Pickled & Passivated, Annealed, Bright Annealed or Polished
Heat Treatment Solution Annealed and Rapidly Cooled as specified by the applicable standard
Testing Hydrostatic, PMI, Ultrasonic, Flattening, Flaring and other applicable tests
Inspection Third Party Inspection available as required
Certification EN 10204 3.1 / Material Test Certificate (MTC)
Packaging Bundles, Wooden Cases, Wooden Boxes, Plastic End Caps and Export Packing
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SS 304H Seamless Pipe Size Chart

The Stainless Steel 304H Seamless Pipe size is selected according to the required flow capacity, operating conditions, pressure, temperature and piping design. Sizes are generally specified using Nominal Pipe Size (NPS) and Outside Diameter (OD), while the wall thickness is selected separately according to the required schedule or dimensional specification.

Kamal Steels can supply SS 304H Seamless Pipes in small-bore and larger industrial sizes according to ASTM, ASME and customer requirements. The required outside diameter, wall thickness, schedule and length should be confirmed before ordering.

NPS Nominal Size Typical Application
1/2" Small Bore Instrumentation and utility piping
1" Small Bore Process and utility lines
2" Small / Medium Bore Process piping and equipment connections
3" Medium Bore Industrial piping systems
4" Medium Bore Process and plant piping
6" Medium / Large Bore Process and transfer piping
8" and above Large Bore Industrial and project applications

SS 304H Seamless Pipe Weight Chart

The weight of Stainless Steel 304H Seamless Pipe depends mainly on its outside diameter, wall thickness and length. Heavier schedules have greater wall thickness and therefore result in a higher weight per metre. For accurate procurement and freight calculations, the actual dimensions and applicable dimensional standard should be used.

Pipe weight can be calculated from the outside diameter and wall thickness, or obtained from the applicable pipe dimensional tables. Kamal Steels can provide dimensional and weight information according to the required size, schedule and length.

Pipe Size Schedule Wall Thickness Weight
1/2" SCH 10S As per applicable standard As per actual dimensions
1" SCH 10S / 40S As per applicable standard As per actual dimensions
2" SCH 10S / 40S As per applicable standard As per actual dimensions
4" SCH 10S / 40S As per applicable standard As per actual dimensions
6" SCH 10S / 40S As per applicable standard As per actual dimensions

SS 304H Seamless Pipe Schedule Chart

The pipe schedule indicates the wall thickness associated with a particular nominal pipe size. For Stainless Steel 304H Seamless Pipe, schedule selection depends on design pressure, operating temperature, mechanical requirements, corrosion conditions and the applicable piping code or project specification.

Common schedules used for stainless steel piping include SCH 5S, SCH 10S, SCH 40S, SCH 80S and SCH 160, with availability depending on pipe size and applicable standard. Customers should specify the required NPS, schedule or exact wall thickness when requesting a quotation.

Schedule Typical Description Selection Consideration
SCH 5S Light Wall Lower-pressure applications where permitted
SCH 10S Light Wall General industrial piping
SCH 40S Standard Wall General process and industrial service
SCH 80S Heavy Wall Higher pressure and demanding service
SCH 160 Extra Heavy Wall Higher pressure and specialized applications

ASTM A312 TP304H Seamless Pipe

ASTM A312 TP304H Seamless Pipe is manufactured from Type 304H austenitic stainless steel and is intended for applications requiring corrosion resistance and suitable mechanical performance at elevated temperatures. TP304H is identified by UNS S30409 and has a higher carbon content than standard Grade 304.

ASTM A312 specifies requirements for seamless, welded and heavily cold-worked austenitic stainless steel pipe intended for high-temperature and general corrosive service. The applicable edition of the specification, grade, dimensions, testing and supplementary requirements should be confirmed for each project.

Kamal Steels supplies ASTM A312 TP304H Seamless Pipe in different sizes, schedules and lengths according to customer specifications. Documentation such as applicable Material Test Certificates can be provided according to the purchase and project requirements.

SS 304H Seamless Pipe Chemical Composition & Mechanical Properties

Stainless Steel 304H is an austenitic chromium-nickel stainless steel with a controlled higher carbon content compared with Grade 304. Its composition provides a combination of corrosion resistance, strength and suitability for elevated-temperature service.

Element Typical / Specification Range
Carbon (C) 0.04–0.10%
Chromium (Cr) 18.0–20.0%
Nickel (Ni) 8.0–11.0%
Manganese (Mn) Up to 2.00%
Silicon (Si) Up to 0.75%
Phosphorus (P) Up to 0.045%
Sulfur (S) Up to 0.030%
Iron (Fe) Balance

Mechanical properties such as tensile strength, yield strength and elongation depend on the applicable specification, product form and testing requirements. For ASTM A312 TP304H pipe, the applicable standard should be consulted for the required minimum mechanical properties and acceptance criteria.

SS 304H Seamless Pipe vs Welded Pipe

Stainless Steel 304H Seamless Pipe is manufactured from a solid billet and does not contain a longitudinal weld seam. Welded pipe is formed from stainless steel plate, sheet or strip and joined along a longitudinal seam. The choice between seamless and welded construction depends on the application, pressure, temperature, dimensions, specification and project requirements.

Feature SS 304H Seamless Pipe SS 304H Welded Pipe
Manufacturing Produced from solid billet Formed from plate, sheet or strip
Longitudinal Weld No longitudinal weld seam Contains a longitudinal welded joint
Pressure Service Suitable for applicable pressure service Suitable where permitted by the specification
Dimensional Range Available in specified seamless dimensions Broad range of larger diameters and wall thicknesses
Typical Applications Process piping and demanding industrial service Industrial, structural and process applications

SS 304H Seamless Pipe Applications & Industries

Stainless Steel 304H Seamless Pipes are used across industrial sectors where corrosion resistance, elevated-temperature strength, durability and reliable service performance are required. The higher carbon content of Grade 304H makes it suitable for selected high-temperature applications where the applicable specification and design conditions permit its use.

Oil & Gas

Industry: Oil & Gas

Application: Process piping, utility lines, fluid transfer and elevated-temperature plant service piping.

Chemical Processing

Industry: Chemical Processing

Application: Chemical fluid handling, process lines, equipment connections and corrosive service piping.

Petrochemical

Industry: Petrochemical

Application: Process piping, refinery systems, plant utilities and high-temperature equipment connections.

Power Generation

Industry: Power Generation

Application: Thermal systems, process piping, high-temperature service lines and power plant equipment.

Heat Exchangers

Industry: Heat Transfer & Process Equipment

Application: Heat-transfer systems, process equipment, thermal service lines and industrial piping.

Industrial Engineering

Industry: Industrial Engineering

Application: Process equipment, fabrication, industrial piping, machinery and general engineering systems.

Stainless Steel 304H Seamless Pipes are selected according to the required pipe size, wall thickness, schedule, operating temperature, pressure, corrosion conditions and applicable ASTM, ASME or project specifications.

Kamal Steels supplies SS 304H Seamless Pipes in different sizes, schedules, lengths and specifications for industrial and project requirements, with applicable testing, inspection, material documentation and export packaging available according to customer requirements.

Frequently Asked Questions

Stainless Steel 304H Pipe is a high-carbon version of SS 304 specifically designed for elevated temperature applications requiring improved creep strength, oxidation resistance and long-term durability.

304H stainless steel tubes are commonly used in boilers, heat exchangers, pressure vessels, refineries, petrochemical plants and power generation facilities operating at high temperatures.

SS 304H contains a higher carbon content than standard SS 304, providing improved high-temperature strength and creep resistance for elevated temperature service conditions.

304H stainless steel is used in piping systems because it offers superior strength, oxidation resistance and structural stability when exposed to prolonged high-temperature environments.

Yes, SS 304H is specifically developed for high-temperature applications and performs well in boilers, superheaters, steam lines and thermal processing systems.

Yes, 304H stainless steel pipes offer excellent resistance to corrosion and oxidation while maintaining strength at elevated temperatures.

Stainless Steel 304H Pipes are widely used in power generation, petrochemical, chemical processing, oil & gas, refinery, boiler manufacturing and heat exchanger industries.

The price of SS 304H pipe depends on pipe size, wall thickness, schedule, quantity and market conditions. Contact Kamal Steels for the latest SS 304H Pipe Price and stock availability.

Stainless Steel 304H typically contains 18–20% Chromium, 8–11% Nickel and a controlled carbon content of 0.04–0.10%, providing enhanced high-temperature strength and oxidation resistance.

SS 304H is better suited for elevated temperature applications requiring higher strength, while SS 304L is preferred for welded applications requiring lower carbon content and improved corrosion resistance.

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