304 / 304L Stainless Steel Pipe
Stellanox Steel is a trusted manufacturer and supplier of high-quality 304 / 304L Stainless Steel Pipes, known for their excellent corrosion resistance, formability, and durability. These pipes are widely used across industries such as construction, chemical processing, water treatment, and food-grade systems. Whether you’re working with pressure systems, structural applications, or fluid conveyance, 304/304L stainless pipes provide long-lasting performance and value.
What is 304 / 304L Stainless Steel Pipe?
304 Stainless Steel Pipe is an austenitic alloy composed primarily of 18% chromium and 8% nickel, offering excellent resistance to oxidation and corrosion in a wide range of environments. 304L is the low-carbon variant of 304, specially designed to minimize carbide precipitation during welding.
Both 304 and 304L pipes are non-magnetic in the annealed condition, highly weldable, and offer good mechanical strength. These pipes are used extensively for transporting fluids and gases, and for structural components requiring resistance to moisture, chemicals, and heat.
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Stainless Steel |
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Duplex Stainless Steel |
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Flanges |
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Key Features of 304 / 304L Stainless Steel Pipe
- Excellent Corrosion Resistance: Performs well in atmospheric, chemical, and mildly acidic environments.
- Low Carbon Variant (304L): Superior weldability with resistance to intergranular corrosion.
- Good Mechanical Strength: Suitable for structural and load-bearing installations.
- Versatile Applications: Used in piping, fabrication, pressure systems, and ornamental design.
- Sanitary & Food-Grade: Safe for use in food processing and potable water systems.
- Non-Magnetic in Annealed State: Ideal for equipment that requires non-magnetic material.
- Available in Seamless and Welded Types: To match both budget and performance requirements.
Specification Chart – 304 / 304L Stainless Steel Pipe
| Property | Details |
|---|---|
| Grades | 304 / 304L (UNS S30400 / S30403) |
| Standards | ASTM A312, A358, A778, ASME SA312 |
| Sizes | 1/8" NB to 24" NB (DN6 to DN600) |
| Wall Thickness | SCH 5 to SCH 160 / XXS |
| Length | Single/Double Random (6m / 12m), Cut-to-length |
| Pipe Types | Seamless, Welded, ERW, EFW |
| Ends | Plain End (PE), Beveled End (BE), Threaded End (TE) |
| Finish | Annealed, Pickled, Polished, Bright Annealed |
| Surface Protection | Plastic Capped, PVC-Wrapped, Paper Interleaf |
Chemical Composition – 304 vs. 304L Stainless Steel Pipe
| Element | 304 (%) | 304L (%) |
|---|---|---|
| Chromium | 18.0 – 20.0 | 18.0 – 20.0 |
| Nickel | 8.0 – 10.5 | 8.0 – 12.0 |
| Carbon | ≤ 0.08 | ≤ 0.03 |
| Manganese | ≤ 2.0 | ≤ 2.0 |
| Silicon | ≤ 0.75 | ≤ 0.75 |
| Phosphorus | ≤ 0.045 | ≤ 0.045 |
| Sulfur | ≤ 0.030 | ≤ 0.030 |
| Iron | Balance | Balance |
Mechanical Properties – 304 / 304L Stainless Steel Pipe
| Property | 304 | 304L |
|---|---|---|
| Tensile Strength (MPa) | ≥ 515 | ≥ 485 |
| Yield Strength (MPa) | ≥ 205 | ≥ 170 |
| Elongation (%) | ≥ 40 | ≥ 40 |
| Hardness (HRB) | ≤ 90 | ≤ 90 |
| Modulus of Elasticity | 193 GPa | 193 GPa |
| Density | 8.00 g/cm³ | 8.00 g/cm³ |
Equivalent Grades
| Standard | 304 | 304L |
|---|---|---|
| ASTM | 304 | 304L |
| EN | 1.4301 | 1.4307 |
| JIS | SUS 304 | SUS 304L |
| UNS | S30400 | S30403 |
| DIN | X5CrNi18-10 | X2CrNi18-9 |
304 / 304L Stainless Steel Pipe Weight Chart
| OD (mm) | Wall Thickness (mm) | Weight per Meter (kg) | Weight per 6m Length (kg) |
|---|---|---|---|
| 21.3 | 2.77 | 1.26 | 7.56 |
| 33.4 | 3.38 | 2.61 | 15.66 |
| 42.2 | 3.56 | 3.64 | 21.84 |
| 48.3 | 3.68 | 4.46 | 26.76 |
| 60.3 | 3.91 | 6.17 | 37.02 |
| 73.0 | 5.16 | 10.14 | 60.84 |
| 88.9 | 5.49 | 13.10 | 78.60 |
| 114.3 | 6.02 | 20.40 | 122.40 |
Applications of 304 / 304L Stainless Steel Pipe
- Water and sewage piping systems
- Food and beverage transport systems
- Heat exchangers and pressure piping
- HVAC ducting and vent lines
- Structural piping in marine and architectural works
- Dairy and brewing pipelines
- Petrochemical and refinery flow lines
Benefits of 304 / 304L Stainless Steel Pipe
- High corrosion resistance in atmospheric and aqueous environments
- Smooth inner bore ensures optimal fluid flow
- Excellent strength-to-weight ratio
- Easy to cut, machine, bend, and weld
- Long life span with minimal maintenance
- Fully recyclable and sustainable material choice
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
What’s the main difference between 304 and 304L pipe?
304L has a lower carbon content, which reduces the risk of carbide precipitation during welding, making it more suitable for high-temperature welded applications.
Is 304 stainless steel pipe safe for drinking water?
Yes, 304/304L stainless steel pipes are commonly used for potable water systems due to their corrosion resistance and non-toxic nature.
Can 304 stainless pipes be used in marine environments?
They can be used in splash zones or less aggressive marine settings. For full seawater exposure, 316L is recommended.
Are both seamless and welded pipes available in 304/304L?
Yes. Seamless pipes are used where high pressure or strength is needed, while welded pipes are more economical and ideal for low-to-moderate pressure uses.
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