SS 304H Seamless Pipes are made of high-carbon austenitic SS with an approximate percentage of chromium of about 18-20% and nickel of about 8-11%, and also it has high percentage of carbon, other than the stainless steel 304/304L grades. This moderated chemical mixture enhances strength and stability in high temperatures and corrosion environments. Chromium gives it resistance to oxidation and low levels of corrosive conditions, whereas nickel increases toughness and ductility. Continuous construction also means that the structures are uniform and remove weld lines, which are sources of weaknesses and this means that the pipes are fit to handle critical services. SS 304H seamless pipes are ideal for high-temperature applications, have good mechanical properties, and can easily deal with pressure. This higher carbon level enhances creep resistance that enables the pipes to work effectively in continuous and discontinuous operations under high temperatures. They are also good in weldability, machinability as well as formability, so the fabrication can be made easier without affecting the performance. These pipes have smooth internal surfaces and uniform wall thickness, which makes them highly efficient in the flow of fluids and service life.
The pipes are typically applicable in boilers, heat exchangers, power generation plants, refineries, petrochemical units, and pressure vessels, and in which strength and temperature resistance are of the essence. SS 304H smooth pipes have different sizes, wall thicknesses, lengths and finishes on the end, which include plain finish, beveled or threaded. Pipes are checked and tested to meet the dimensional accuracy, mechanical strength, and the levels as per the standard procedures in the industry.
Table of Content
- SS 304H Seamless Pipe Specifications
- High-Temperature Properties of SS 304H Welded Pipe
- Chemical Composition of SS 304H Seamless Pipe
- ASME SA312 SS TP304H Seamless Pipes Mechanical Properties
- Physical Properties of SS 304H SS
- Manufacturing Process of SS 304H Seamless Pipes
- SS 304H Seamless Pipe Sizes Chart
- SS 304H Seamless Pipe Dimension Chart
- Stainless Steel UNS S30409 Seamless Pipes Equivalent Grades
- SS 304H vs 304 vs 304L Pipes
- Advantages of SS 304H Seamless Pipes
- Applications of SS 304H Seamless Pipes
- Why Choose Metinox Overseas?
- Frequently Asked Questions (FAQ)
SS 304H Seamless Pipe Specifications
| Specification | Details |
| Material Grade | SS 304H / UNS S30409 / WNR 1.4948 |
| Standard | ASTM A312, ASME SA312 |
| Outside Diameter (OD) | 1/8" to 12" NPS (6.35 mm to 114.3 mm for specific round pipes) |
| Wall Thickness (WT) | 0.6 mm to 12.7 mm |
| Schedule | SCH 5 to SCH XXH |
| Length | Single Random, Double Random |
| Technique | Cold Formed, Precision Rolled, Hot Formed |
| Manufacturing Process | Seamless, ERW, Welded, Fabricated |
| Ends | Plain End, Beveled End |
| Finish Options | Polished, Bright, Annealing, Mirror |
| Testing Protocols | Chemical, Mechanical, Ultrasonic, PMI (Positive Material Identification) |
| Origin | India, Europe, Japan, South Korea |
High-Temperature Properties of SS 304H Welded Pipes
| Temperature (�C) | Temperature (�F) | Yield Strength (MPa) | Tensile Strength (MPa) |
| Room Temp | 68 | 205 | 515 |
| 100 | 212 | 170 | 450 |
| 300 | 572 | 125 | 400 |
| 500 | 932 | 105 | 385 |
| 600 | 1112 | 95 | 315 |
| 700 | 1292 | 85 | 215 |
| 800 | 1472 | 75 | 135 |
Chemical Composition of SS 304H Seamless Pipes
| Element | Symbol | Composition (Wt. %) |
| Carbon | C | 0.04 - 0.10 |
| Manganese | Mn | 2.00 max |
| Silicon | Si | 0.75 max |
| Phosphorus | P | 0.045 max |
| Sulfur | S | 0.030 max |
| Chromium | Cr | 18.0 - 20.0 |
| Nickel | Ni | 8.0 - 10.5 |
| Molybdenum | Mo | � |
| Nitrogen | N | � |
ASME SA312 SS TP304H Seamless Pipes Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness Rockwell B (HR B) max | Hardness Brinell (HB) max |
| SS 304H | 515 | 205 | 40 | 92 | 201 |
Physical Properties of SS 304H Seamless Pipes
| Electrical Resistivity (nO�m) | Density (kg/m�) | Thermal Expansion (�m/m/�C) | Specific Heat (J/kg�K) | Thermal Conductivity (W/m�K) | Elastic Modulus (GPa) |
| 720 | 8000 | 0-538�C: 18.4 0-315�C: 17.8 0-100�C: 17.2 |
500 | at 500�C: 21.5 at 100�C: 16.2 |
193 |
Manufacturing Process of SS 304H Seamless Pipes
The manufacturing process of SS 304H Seamless Pipes is well defined and controlled to offer a high strength and stability to the pipes to be used in high-temperature applications.
Raw Material Selection
Billets made of high-carbon SS are obtained in the ISO-certified mills in order to maintain the right chemical composition, strength, and heat resistance according to the SS 304H standards.
Billet Heating & Piercing
The billets are heated in high temperatures and punched to create hollow tubes with no weld seams which guarantee high structural integrity and consistency.
Mandrel Drawing & Sizing
The hollow pipes are pulled over the mandrels to obtain the required outer diameter, wall thickness and length as stipulated by ASTM standards.
Solution Heat Treatment
Controlled heat treatment is applied to pipes in order to enhance strength at high temperature, stabilize the microstructure and strengthen the performance of the pipes in general.
Pickling & Passivation
Pickling is used to get rid of surface oxides and then passivation is done to improve the corrosion resistance and cleanliness of the surface.
Dimensional and Surface Inspection
All the pipes are checked concerning diameter, thickness, straightness, and surface finish in order to meet the requirements of ASTM A312 TP304H.
Pressure Testing and Non-Destructive Testing
Tests are performed under high-pressure conditions under ultrasonic, eddy current and hydrostatic pressure tests, to confirm that the product performs without any defects.
International Dispatch and Certification
Complete traceability is offered as Mill Test Certificates (EN 10204 3.1) and pipes are packed in order to export to USA, Europe, Middle East, and LATAM.
SS 304H Seamless Pipe Sizes Chart
| Wall Thickness (WT) | Sizes (Diameter) |
| .375 | 3 1/2" |
| .250 | 3" |
| .134 | 1" |
| .125 | 3/4", 1 1/4", 2", 3", 3 1/4" |
| .120 | 1/2", 5/8", 7/8", 1", 1 1/4", 1 1/2", 2", 2 1/4", 2 1/2", 3" |
| .109 | 1/2", 1", 1 1/4", 1 1/2", 2" |
| .095 | 1/2", 5/8", 1", 1 1/2", 2" |
| .083 | 1/4", 5/8", 3/4", 7/8", 1", 1 1/4", 1 5/8", 1 7/8", 2 1/2", 3" |
| .065 | 1/4", 3/8", 1/2", 5/8", 7/8", 1", 1 1/2", 1 5/8", 1 3/4" |
| .049 | 3/16", 5/16", 5/8", 3/4", 1", 1 1/8", 1 5/8", 2", 2 1/4" |
| .035 | 1/8", 1/4", 3/8", 7/16", 1/2", 5/8", 1 1/4", 1 1/2", 1 5/8", 2" |
| .028 | 3/16", 1/4", 5/16", 3/8", 1/2", 3/4", 1", 1 1/2", 2" |
| .020 | 1/16", 1/8", 1/4", 5/16", 3/8" |
| .016 | 1/8", 3/16" |
| .012 | 1/8" |
| .010 | 1/16", 1/8", 3/16" |
SS 304H Seamless Pipe Dimension Chart
| NPS (DN) | Weight (kg/m) | SCH | OD (mm) | ID | WT (mm) |
| 32 | 126.032 | � | 813 | � | 6.035 |
| 34 | 134.031 | � | 864 | � | 6.035 |
| 36 | 142.014 | � | 914 | � | 6.035 |
| 38 | 186.094 | � | 965 | � | 7.092 |
Stainless Steel UNS S30409 Seamless Pipes Equivalent Grades
| Property | Value (Minimum) |
| Tensile Strength | 515 MPa (75,000 psi) |
| Yield Strength (0.2% Proof) | 205 MPa (30,000 psi) |
| Elongation (in 50mm) | 40% |
| Hardness (Brinell) | 201 HB Max |
| Hardness (Rockwell B) | 92 HRB Max |
SS 304H vs 304 vs 304L Pipes Comparison
| Feature | Grade 304 (Standard) | Grade 304L (Low Carbon) | Grade 304H (High Carbon) |
| UNS Designation | S30400 | S30403 | S30409 |
| Carbon (%) | =0.08 | =0.03 | 0.04 - 0.10 |
| Tensile Strength (min) | 515 MPa | 485 MPa | 515 MPa |
| Yield Strength (min) | 205 MPa | 170 MPa | 205 MPa |
| Max Service Temp | ~425�C (continuous) | ~425�C | Up to 815�C (1500�F) |
| Weldability | Good | Excellent (No Annealing) | Fair (Risk of Sensitization) |
| Primary Advantage | Versatile General Purpose | Best for Welding/Corrosion | Best for High Heat Strength |
Advantages of SS 304H Seamless Pipes
The SS 304H Seamless Pipe is associated with a lot of advantages, some of which include the following:
High-Temperature Strength
The superior amount of carbon in SS 304H offers good strength and stability at high temperatures, and is thus applicable in the heat-sensitive applications.
Seamless Construction
The seamless weld joints enhance the structural integrity and minimize chances of leakage or collapse due to high pressure.
Good Corrosion Resistance
The levels of chromium and nickel provide good resistance against oxidation and low corrosive conditions.
Excellent Pressure Handling
The standardized thickness of the walls allows these pipes to stand under high internal pressure and mechanical stress.
Good Weldability and Fabrication
SS 304H seamless pipes are easily welded and molded, and mechanical strength is not lost.
Long Service Life
Good mechanical characteristics and thermal fatigue resistance give the products longevity in harsh environments.
Applications of SS 304H Seamless Pipes
This material is mostly applied in industries with high temperatures and power plants, although there are some of the most common industries that apply this material, depending on their needs.
Power Generation Plants
Applied in boilers, superheaters, and heat recovery units with high temperatures.
Oil & Gas Industry
It can be used in high-pressure and high-temperature piping systems of refineries and processing units.
Plants, Petrochemical, and Chemical
They can handle hot process fluids, gasses and hostile operating environments effectively.
Heat Exchangers & Boilers
They are also popular in components that have high creep resistance and heat stability.
Pressure Vessels
Applied in the pressure retaining equipment of critical importance because of its great strength and stability.
Why Choose Metinox Overseas?
Here are some key reasons to choose Metinox Overseas for SS 304H Seamless Pipes:
- Manufactured in ISO 9001:2015 certified mills for consistent quality
- Expertise in high-performance SS 304H seamless pipes for industrial use
- Wide range of sizes, schedules, and custom lengths available
- Pipes designed to withstand high temperature and pressure applications
- Strict testing, including PMI, hydrostatic, and non-destructive inspections
- Reliable export to the USA, Europe, the Middle East, LATAM, and Asia
- Durable packaging ensuring safe delivery to global clients
- Dedicated support with technical guidance and competitive pricing
Looking for High-Quality SS 304H Seamless Pipes?
Choose Metinox Overseas � Your Reliable Stainless Steel Pipe Manufacturer & Exporter.
Let us support your projects with quality, precision, and performance.
Frequently Asked Questions (FAQ)
The 304H SS has a higher carbon content than 304, giving it better strength at high temperatures while maintaining similar corrosion resistance.
It is used in high-temperature, high-pressure applications like boilers, heat exchangers, chemical processing, and power plants.
The composition of SS 304H typically contains 18�20% chromium, 8�10% nickel, and 0.04�0.10% carbon, along with small amounts of manganese, silicon, and phosphorus.
Many industries use this material according to their usage, that include power generation, chemical and petrochemical, oil and gas, food processing, pharmaceuticals, and water treatment.
Yes, SS 304H is ideal for high-temperature applications due to its excellent strength and stability at elevated temperatures.
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