Stainless Steel 304L Seamless Pipes
Stainless steel 304L seamless pipe is a low-carbon austenitic stainless steel pipe known for its excellent corrosion resistance, high weldability, and reliable performance in demanding environments. At Thaida, a trusted manufacturer based in Chon Buri, Thailand, we produce 304L stainless steel seamless pipes in accordance with ASTM standards, offering a variety of sizes, wall thicknesses, and custom lengths to meet diverse industry needs. Ideal for applications such as chemical processing, food-grade systems, and heat exchangers, these pipes are widely preferred for their durability and smooth finish. With precision manufacturing and strict quality control, we ensure every pipe delivers consistent performance, making us a dependable supplier for SS 304L seamless piping solutions in Thailand.
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Product Overview Stainless Steel 304L Seamless Pipes
304L Stainless Steel Pipes, made from a low-carbon version of Stainless Steel Alloy 304. The “L” in 304L stands for “low carbon,” which means it contains a maximum of 0.03% carbon, compared to up to 0.08% in standard 304. DIN 1.4307 / UNS S30403 is especially valued for its excellent weldability and reduced risk of carbide precipitation, making it ideal for applications where frequent welding is required. Unlike standard 304, ASTM A312 TP304L offers better performance in corrosive environments and is easier to handle during cutting, forming, and machining. Manufactured according to ASTM A312 standards, these pipes are available in various sizes and lengths to suit different piping system requirements, and can also be tailored to specific project needs with customized solutions. Each pipe is designed to ensure long-lasting quality and reliability in demanding conditions, making it a preferred choice for structural, industrial, and chemical processing applications.
Key Features of Stainless Steel 304L Seamless Pipes
Corrosion Resistance
304L stainless steel pipe offers excellent resistance to a wide range of corrosive environments, including mild acids, chemicals, and atmospheric conditions, ensuring long service life even in harsh settings.
Weldability
With its low carbon content, ASTM A312 TP304L allows for easy welding without the risk of carbide precipitation, making it suitable for fabrication and maintenance in complex piping systems.
Strength and Pressure Rating
These pipes provide good mechanical strength and can withstand moderate to high pressure, making them reliable for use in industrial processes, fluid transport, and structural applications.
Surface Finish
Stainless steel 304L seamless pipes come with a smooth, clean surface that enhances both appearance and resistance to scale and contaminants, ideal for sanitary and aesthetic look.
Why Choose Our Stainless Steel 304L Seamless Pipes
Thaida is a trusted manufacturer and supplier known for delivering premium-quality ASTM A312 TP304L pipes with precision engineering and strict quality control. We offer pipes in a wide range of sizes and finishes, along with custom solutions to meet specific project needs. What sets Thaida apart is our commitment to timely delivery, competitive pricing, and personalized service, making us a reliable partner for all your stainless steel piping system requirements.
Competitive Pricing
Global Exports Expertise
Large Inventory & Fast Dispatch
Custom Sizes & Finishes
Industry Certifications & Compliance
Advanced Production Technology
After-Sales Support, Service- Technical Support
In-House Testing & Full Traceability
304L Stainless Steel Seamless Pipes Specification
| Specifications | ASTM A 312 ASME SA 312 |
|---|---|
| Dimensions | ASTM, ASME and API |
| Size | ½” to 6” NB Sch 10s, 40s, & 80s, 160s |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Type | Seamless |
| Form | Round, Square, Rectangular, Hydraulic Etc |
| Length | Single Random, Double Random & Cut Length |
| End | Plain End, Beveled End, Treaded |
Stainless Steel 304L Seamless Pipes Size Chart
Find the standard sizes and dimensions available for 304L seamless pipes to suit various application needs.
| 304L SS Pipes OD (mm) | Pipes WT (mm) | in. | Sch | Kg/m |
|---|---|---|---|---|
| 13.72 | 1.65 | 1/4 | 10S | 0.50 |
| 13.72 | 2.24 | 1/4 | 40S | 0.64 |
| 13.72 | 3.02 | 1/4 | 80S | 0.81 |
| 17.15 | 1.65 | 3/8 | 10S | 0.64 |
| 17.15 | 2.31 | 3/8 | 40S | 0.86 |
| 17.15 | 3.20 | 3/8 | 80S | 1.12 |
| 33.40 | 6.352 | 1 | 160 | 4.30 |
| 42.16 | 6.352 | 1¼ | 160 | 5.69 |
| 60.33 | 8.742 | 2 | 160 | 11.29 |
| 88.90 | 11.132 | 3 | 160 | 21.67 |
| 114.30 | 13.492 | 4 | 160 | 34.05 |
| 141.30 | 15.882 | 5 | 160 | 49.87 |
| 168.28 | 18.262 | 6 | 160 | 68.59 |
| 219.08 | 23.012 | 8 | 160 | 112.97 |
304L Stainless Steel Seamless Pipes Pressure Rating
The detailed pressure ratings for Stainless steel 304L seamless pipe, including wall thickness and outer diameter comparisons.
| Pipe O.D. (in.) | Wall .028 | Wall .035 | Wall .049 | Wall .065 | Wall .083 | Wall .095 | Wall .109 | Wall .120 |
|---|---|---|---|---|---|---|---|---|
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 |
| Pipe OD | .010 | .012 | .016 | .020 | .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/16 | 6,422 | 7,872 | 10,768 | 13,484 | ||||||||
| 1/8 | 6,422 | 9,325 | 11,823 | |||||||||
| 3/16 | 4,081 | 5,935 | 7,630 | 11,005 | ||||||||
| 1/4 | 4,305 | 5,518 | 8,053 | 10,946 | ||||||||
| 3/8 | 3,530 | 5,107 | 7,029 | |||||||||
| 1/2 | 2,595 | 3,721 | 5,078 | 6,699 | ||||||||
| 5/8 | 2,051 | 2,927 | 3,970 | 5,200 | 6,056 | |||||||
| 3/4 | 1,696 | 2,412 | 3,259 | 4,249 | 4,933 | 5,755 | 6,422 | |||||
| 7/8 | 1,446 | 2,051 | 2,764 | 3,592 | 4,161 | 4,842 | 5,391 | |||||
| 1 | 5,040 | 7,140 | 9,595 | 12,445 | 14,390 | 16,715 | 18,585 |
| Pipe OD | 0.5 | 0.6 | 0.7 | 0.8 | 1.0 | 1.2 | 1.5 | 1.6 | 1.8 | 2.0 | 2.2 | 2.5 | 3.0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 464 | 567 | 672 | 775 | 965 | ||||||||
| 4 | 335 | 411 | 491 | 567 | 723 | 873 | |||||||
| 6 | 310 | 360 | 464 | 567 | 723 | 775 | |||||||
| 8 | 227 | 262 | 335 | 411 | 528 | 567 | |||||||
| 10 | 206 | 262 | 320 | 411 | 442 | ||||||||
| 12 | 169 | 215 | 262 | 335 | 360 | 411 | 464 | ||||||
| 14 | 182 | 222 | 282 | 303 | 345 | 389 | 433 | 500 | 612 | ||||
| 16 | 158 | 192 | 244 | 262 | 298 | 335 | 372 | 430 | 528 | ||||
| 18 | 140 | 169 | 215 | 230 | 262 | 294 | 326 | 377 | 464 | ||||
| 22 | 113 | 137 | 173 | 186 | 211 | 236 | 262 | 301 | 369 | ||||
| 25 | 99 | 120 | 152 | 162 | 184 | 206 | 228 | 262 | 320 |
SS ASTM A312 TP304L Seamless Pipes Tolerances
The manufacturing tolerances allowed for ASTM A312 TP304L pipes in terms of diameter, thickness, and length.
| STANDARD | OD (D) mm | TOLERANCE (mm) Common / High | THICKNESS (S) mm | TOLERANCE | LENGTH (mm) | TOLERANCE (mm) |
|---|---|---|---|---|---|---|
| JIS3449 hot finished pipe | D > 50 D ≥ 50 |
±0.50 ±1.0% |
S ≤ 4 S ≥ 4 |
±0.5 ±12.5% |
D > 50, L < 7M | +7/0 |
| JIS 3459 cold finished pipe | D > 30 D ≥ 30 |
±0.3 ±1.0% |
S ≤ 2 S ≥ 2 |
±0.20 ±10% |
D > 50, L < 10M | +10/0 |
| JIS G3463 hot finished pipe |
100 < D 100 ≤ D ≤ 120 120 ≤ D ≤ 160 160 ≤ D ≤ 200 200 ≤ D |
+0.4/-0.8 +0.4/-1.2 +0.4/-1.8 +0.4/-2.4 +0.4/-2.4 |
D < 100, 2S ≤ 2.4 D < 100, 2.4 ≤ S ≤ 3.8 D < 100, 3.8 ≤ S ≤ 4.6 D < 100, 4.6 ≤ S ≤ 8.0 D > 100, S ≤ 2 D > 100, S ≤ 2.4 D > 100, 2.4 ≤ S ≤ 3.8 D > 100, 3.8 ≤ S ≤ 4.6 |
+40%/0 +35%/0 +33%/0 +28%/0 // +40%/0 +35%/0 +28%/0 |
D ≤ 100, L < 13M D ≤ 100, L < 14M |
+13/0 +15/0 |
| JIS G3463 cold finished pipe |
60 ≤ D ≤ 80 80 ≤ D ≤ 100 100 ≤ D ≤ 120 120 ≤ D ≤ 160 160 ≤ D ≤ 200 200 ≤ D |
±0.3 ±0.4/-0.6 ±0.4/-0.6 ±0.4/-1.2 ±0.4/-1.2 ±0.4/-1.6 |
D < 40, S ≤ 2.0 D > 40, S ≤ 2.0 D ≥ 40 |
+20%/0 +20%/0 +22%/0 |
D ≤ 50, L < 10M | +13/0 +15/0 |
| GBT 14975 (hot rolled, extruded) | D ≤ 76.1 76.1 < D ≤ 139.7 139.7 < D ≤ 273.1 273.1 < D ≤ 323.9 D ≥ 323.9 |
±1.25% ±0.6 ±1.5% ±0.8 ±1.5% ±1.2 ±1.5% ±1.6 ±1.5% ±2.0 |
All | +15%/-12.5% ±12.5% ±10% |
- | - |
| GBT 14975 (cold rolled, drawn) |
D ≤ 12.7 12.7 < D ≤ 38.1 38.1 < D ≤ 88.9 88.9 < D ≤ 139.7 139.7 < D ≤ 203.2 203.2 < D ≤ 219.1 219.1 < D ≤ 323.9 D ≥ 323.9 |
±0.3 ±0.15 ±0.3 ±0.15 ±0.5 ±0.20 ±0.9% ±0.40 ±0.9% ±0.50 ±0.9% ±0.50 |
All | +12.5%/-10% ±10% |
- | - |
| GBT 14976 (hot rolled, extruded) |
68 ≤ D ≤ 159 D > 159 |
±1.25% ±1 ±1.5% |
S ≤ 15 S min ≥ 1.5 |
+15%/-12.5% +15%/-10% |
- | - |
| GBT 14976 (cold rolled, drawn) |
D ≤ 38.1 38.1 < D ≤ 88.9 88.9 < D ≤ 219 D > 219 |
±0.5% ±0.75% ±0.9% ±0.95% |
S ≤ 3 S ≥ 3 S min, all |
+12.5%/-10% +22%/-0 |
- | - |
Equivalent Material Grade of 304L Stainless Steel Seamless Pipes
Stainless steel 304L pipe equivalent table highlights equivalent grades across different international specifications and standards.
| Grade | UNS No | Old British BS | Old British En | Euronorm No | Euronorm Name | Swedish SS | Japanese JIS |
|---|---|---|---|---|---|---|---|
| 304L | S30403 | 304S11 | 58E | 1.4307 | X5CrNi18-10 | 2332 | SUS 304L |
Chemical Composition of 304L Stainless Steel Seamless Pipes
The chemical composition of stainless steel 304L seamless pipe table includes key elements like chromium, nickel, and carbon.
| Grade | C | Si | Mn | Cr | Ni | S | P |
|---|---|---|---|---|---|---|---|
| 304L | ≤ 0.035 | ≤ 1.00 | ≤ 2.00 | 18.00 – 20.00 | 8.00 – 12.00 | ≤ 0.03 | ≤ 0.045 |
Mechanical Properties 304L Stainless Steel Seamless Pipes
The mechanical properties table for stainless steel 304L seamless pipes covers tensile strength, yield strength, elongation, and other metrics below.
| 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 |
|---|---|---|---|---|---|
| 304L | 485 | 170 | 40 | 92 | 201 |
Physical Properties Stainless Steel 304L Seamless Pipes
The key Stainless Steel 304L Seamless Pipes physical characteristics include specific gravity, elasticity, and heat resistance.
| Grade | Density (kg/m³) | Elastic Modulus (GPa) | Thermal Expansion 0–100°C | Thermal Expansion 0–315°C | Thermal Expansion 0–538°C | Thermal Conductivity at 100°C (W/m·K) | Thermal Conductivity at 500°C (W/m·K) | Specific Heat 0–100°C (J/kg·K) | Electrical Resistivity (n·m) |
|---|---|---|---|---|---|---|---|---|---|
| 304L | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
Stainless Steel S30403 Seamless Pipes Surface Finish
The detailed surface finish options for Stainless Steel S30403 Pipes, covering RA values for ID and OD surfaces.
| Surface Finish | Internal Surface (ID) | External Surface (OD) | |||
|---|---|---|---|---|---|
| Roughness Average (RA) | Roughness Average (RA) | ||||
| μ inch | μm | μ inch | μm | ||
| AP | Annealed & Pickled | Not defined | Not defined | 40 or Not defined | 1.0 or Not defined |
| BA | Bright Annealed | 40, 32, 25, 20 | 1.0, 0.8, 0.6, 0.5 | 32 | 0.8 |
| MP | Mechanical Polish | 40, 32, 25, 20 | 1.0, 0.8, 0.6, 0.5 | 32 | 0.8 |
| EP | Electro Polish | 15, 10, 7, 5 | 0.38, 0.25, 0.20, 0.13 | 32 | 0.8 |
Stainless Steel 304L Seamless Pipes Manufacturing Process
The following are the 5 steps involved in the stainless steel 304L seamless pipe manufacturing process to achieve high-quality output.
1. Raw Material Selection
High-quality stainless steel billets and strips are carefully selected for superior strength and corrosion resistance.
2. Pipes Formation
The selected raw material is formed into pipes using seamless extrusion methods, depending on the application.
3. Heat Treatment
Pipes undergo required controlled heat treatment to enhance mechanical properties and relieve internal stresses.
4. Cold Working and Finishing
After heat treatment, pipes are cold-worked for better surface finish, dimensional accuracy and improved strength.
5. Quality Control and Testing
Every pipe is thoroughly inspected and tested to ensure it meets international quality standards for performance and reliability.
Applications of Stainless 304L Seamless Pipes
Stainless steel 304L seamless pipes are widely used in the chemical and petrochemical industry for transporting corrosive fluids and gases. This sector is the largest consumer due to the material’s excellent corrosion resistance and weldability, making it ideal for pipelines, heat exchangers, and process piping that handle acids, solvents, and other reactive substances.
Oil and Gas Industry
Chemical and Petrochemical Industry
Food and Beverage Industry
Pharmaceutical & Biotechnology
Aerospace & Defense
Automotive and Transportation
Construction and Architecture
Marine & Shipbuilding
Power Generation & Heat Exchange
FAQ's
Can Stainless Steel 304L Seamless Pipes be used in high-temperature environments?
Yes, Stainless Steel 304L Seamless Pipes can be used in high temperatures up to 870°C because of their excellent heat and corrosion resistance, making them suitable for applications like furnace flues and exhaust systems, heat exchangers, boiler tubes, chemical processing equipment and power generation facilities. The L grade is preferred for welded high-temperature applications as it reduces the risk of sensitization during welding.
What industries prefer 304L over 304 stainless steel?
Industries that perform welding in corrosive environments prefer 304L over 304 stainless steel. The L grade has a lower carbon content which prevents carbide formation during welding that can cause intergranular corrosion. This makes 304L ideal for the chemical, petrochemical, food and beverage processing industries and for welded architectural structures.
What testing methods are used for Stainless Steel 304L Seamless Pipes?
Testing methods for Stainless Steel 304L seamless pipes include non-destructive tests like ultrasonic and eddy current testing, mechanical tests like tensile, hardness, and flattening tests, chemical analysis to verify composition, and corrosion tests like the intergranular corrosion (IGC) test. Other common tests include hydrostatic pressure tests, dimensional inspections, and visual checks for surface defects.
What does the L stand for in 304L stainless steel?
The L in 304L stainless steel stands for “low carbon”. This means that the carbon content in this grade is less compared to the standard 304 grade. This lower carbon content improves its weldability and reduces the risk of intergranular corrosion after welding.
What is the difference between 304 and 304L pipe?
The primary difference between 304 and 304L pipe lies in the reduced carbon content. 304L has a lower carbon content (<0.003%) compared to 304. This makes it better resistant to corrosion after welding, making it suitable for welded applications. 304 has a slightly higher tensile strength because of its higher carbon content.
What is a 304L pipe material?
A 304L pipe is a low-carbon stainless steel pipe, an alloy of iron, chromium, and nickel, known for excellent corrosion resistance and weldability.
What is type 304L stainless steel?
304L stainless steel is a low-carbon version of the standard grade 304, known for its excellent corrosion resistance and weldability. This low carbon content prevents intergranular corrosion after welding, making it suitable for welded applications like food and chemical processing industries.