The 304L SS Pipe is one of the most common low-carbon austenitic SS which is widely used in the industrial piping industry. Metinox Overseas is a reliable manufacturer and supplier of ASTM A312 TP304L seamless pipes, which are round, square, rectangular as well as custom-made. It's a low-carbon 18-8 SS alloy that is made up of 18% chromium and 8-13% nickel, which offers a perfect level of corrosion resistance, good weldability, and service life. These pipes are available in various surface finishes such as polished, bright annealed, electropolished and honed to satisfy the requirements of the oil and gas producing industries, chemical processing industries, food and beverage industries, pharmaceutical industries, power generation industries and water processing industries.
SS 304L pipes can be used in either high temperature or very low temperature. Their low-carbon structure enhances post-welding resistance to corrosion and in most instances, post-welding heat treatment is unnecessary. The pipes are flexible and have good mechanical strength and durability hence they are designed to handle high-pressure and high-temperature services. Metinox Overseas holds on hand finished pipes made of SS 304L seamless in numerous different sizes and schedules to ASTM A312, ASME SA312 and EN standards. The quality checks that each pipe is subjected to include hydrostatic tests, ultrasonic tests, PMI tests, and dimensional tests to meet the international standards. SS 304H pipes are also available in case of an application that needs higher temperature strength.
Table of Contents � SS 304L Seamless Pipes
- SS 304L Seamless Pipe Specifications
- SS 304L Seamless Pipe Sizes & Dimensions
- ASTM A312 TP304L Seamless Pipe Schedule Chart
- SS 304L Seamless Pipe Weight Chart
- Chemical Composition of SS 304L Seamless Pipe
- Mechanical Properties of SS 304L Seamless Pipes
- Physical Properties of SS 304L Seamless Pipes
- Surface Finish of SS 304L Pipes
- Tolerance Chart for SS 304L Seamless Pipes
- Manufacturing Process of SS 304L Seamless Pipes
- Material Testing & Quality Control
- Equivalent Grades & Standards
- Different Types of SS 304L Seamless Pipes
- Advantages of SS 304L Seamless Pipes
- Applications of SS 304L Seamless Pipes
- Why Choose Metinox Overseas?
- Frequently Asked Questions (FAQ)
SS 304L Seamless Pipe Specifications
| Specification | Details |
| Standard | ASTM A312, ASME SA312 (Standard Spec for Seamless Pipe) |
| Additional Specs | ASTM A213 (Boiler/Exchanger Tubes), ASTM A269 (General Tubing) |
| Grade | TP304L (UNS S30403) |
| Size Range | 1/8NB to 24 NB (Nominal Bore) |
| Outside Diameter | 10.3 mm to 610 mm |
| Schedules | SCH 5S, 10S, 40S, 80S, 160, XXS |
| Wall Thickness | 1.24 mm up to 59.54 mm |
| Length | Single Random (5�7m), Double Random (10�12m), Cut-to-length |
| Manufacturing | Hot Rolled, Cold Drawn, Extruded |
| Finish | Annealed & Pickled (AP), Polished (Grit 180, 320, 400), Mirror Finish |
| Ends | Plain End (PE), Beveled End (BE), Threaded (TE) |
SS 304L Seamless Pipe Sizes & Dimensions
| Pipe Form | Size Range (NPS) | Dimension Standards | Thickness (Schedules) |
| SS 304L Seamless Pipe | 1/8 to 24 | ANSI B36.19, ANSI B36.10 | SCH 5S, 10S, 40S, 80S, 160, XXS |
| SS 304L Welded Pipe | 1/2 to 48 | ANSI B36.19, ANSI B36.10 | SCH 5S, 10S, 40S, 80S |
| SS 304L ERW Pipe | 1/2 to 24 | ANSI B36.19 | SCH 10S, 40S, 80S |
| SS 304L EFW Pipe | 6 to 100 | ANSI B36.19, ASTM A358 | SCH 5S to SCH 80S |
ASTM A312 TP304L Seamless Pipes Schedule Chart
| NPS (Inches) | OD (mm) | SCH 5S (WT) | SCH 10S (WT) | SCH 40S (WT) | SCH 80S (WT) | SCH 160 (WT) |
| 1/4 | 13.72 | 1.24 | 1.65 | 2.24 | 3.02 | � |
| 1/2 | 21.34 | 1.65 | 2.11 | 2.77 | 3.73 | 4.78 |
| 3/4 | 26.67 | 1.65 | 2.11 | 2.87 | 3.91 | 5.56 |
| 1 | 33.40 | 1.65 | 2.77 | 3.38 | 4.55 | 6.35 |
| 1-1/4 | 42.16 | 1.65 | 2.77 | 3.56 | 4.85 | 6.35 |
| 1-1/2 | 48.26 | 1.65 | 2.77 | 3.68 | 5.08 | 7.14 |
| 2 | 60.33 | 1.65 | 2.77 | 3.91 | 5.54 | 8.74 |
| 2-1/2 | 73.03 | 2.11 | 3.05 | 5.16 | 7.01 | 9.53 |
| 3 | 88.90 | 2.11 | 3.05 | 5.49 | 7.62 | 11.13 |
| 4 | 114.30 | 2.11 | 3.05 | 6.02 | 8.56 | 13.49 |
| 6 | 168.28 | 2.77 | 3.40 | 7.11 | 10.97 | 18.26 |
| 8 | 219.08 | 2.77 | 3.76 | 8.18 | 12.70 | 23.01 |
| 10 | 273.05 | 3.40 | 4.19 | 9.27 | 12.70 | 28.58 |
| 12 | 323.85 | 3.96 | 4.57 | 9.53 | 12.70 | 33.32 |
SS 304L Seamless Pipe Weight Chart
| NPS (Inches) | OD (mm) | SCH 10S (kg/m) | SCH 40S (kg/m) | SCH 80S (kg/m) | SCH 160 (kg/m) |
| 1/2 | 21.34 | 1.02 | 1.27 | 1.62 | 1.95 |
| 3/4 | 26.67 | 1.29 | 1.69 | 2.20 | 2.90 |
| 1 | 33.40 | 2.09 | 2.50 | 3.24 | 4.24 |
| 1-1/4 | 42.16 | 2.69 | 3.39 | 4.47 | 5.61 |
| 1-1/2 | 48.26 | 3.11 | 4.05 | 5.41 | 7.25 |
| 2 | 60.33 | 3.93 | 5.44 | 7.48 | 11.11 |
| 2-1/2 | 73.03 | 5.26 | 8.63 | 11.41 | 15.00 |
| 3 | 88.90 | 6.46 | 11.30 | 15.27 | 21.35 |
| 4 | 114.30 | 8.37 | 16.07 | 22.32 | 33.54 |
| 6 | 168.28 | 13.84 | 28.26 | 42.56 | 67.57 |
| 8 | 219.08 | 19.96 | 42.55 | 64.64 | 111.74 |
| 10 | 273.05 | 27.78 | 60.31 | 81.53 | 172.26 |
Chemical Composition of SS 304L Seamless Pipe
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Nitrogen (N) |
| Percentage | 0.035 max | 2.00 max | 0.045 max | 0.030 max | 1.00 max | 18.0 - 20.0 | 8.0 - 12.0 | 0.10 max |
Mechanical Properties of Stainless Steel 304L Seamless Pipe
| Property | Metric Value | Imperial Value |
| Tensile Strength (min) | 485 MPa | 70,000 psi |
| Yield Strength (0.2% Offset) | 170 MPa | 25,000 psi |
| Elongation (in 50mm) | 35% min | 35% min |
| Hardness (Brinell) | 201 HBW max | � |
| Hardness (Rockwell B) | 92 HRB max | � |
Physical Properties of 304L Seamless Pipe
| Property | Value |
| Density | 8,000 kg/m� (0.285 lb/in�) |
| Melting Point Range | 1400-1450�C (2550-2650�F) |
| Modulus of Elasticity | 193 GPa (28.0 x 106 psi) |
| Thermal Conductivity | 16.2 W/m-K (at 100�C) |
| Electrical Resistivity | 720 nO�m |
| Specific Heat | 500 J/kg-K (0-100�C) |
| Magnetic Permeability | 1.02 (Annealed condition) |
Surface Finish of SS 304L Pipes
| Finish Type | Name | Description | Common Application |
| No. 1 | Hot Rolled, Annealed | Dull, slightly rough, and matte. Scale removed by pickling. | Industrial tanks, chemical plants. |
| No. 2 | Cold Rolled, Smooth | Semi-reflective, "cloudy mirror" look. Most common finish. | Food processing, kitchenware. |
| No. 3 | Bright Annealed | Highly reflective and mirror-like. Processed in an oxygen-free furnace. | Decorative trim, medical equipment. |
| No. 4 | Brushed / Satin | Unidirectional polished lines (150-180 grit). Non-reflective. | Architectural panels, handrails. |
| No. 5 | Mirror Finish | Deeply polished with fine abrasives for a true mirror surface. | High-end cladding, reflectors. |
| No. 6 | Annealed & Pickled | Standard industrial finish: clean, gray, and matte. | General piping and structural. |
Tolerance Chart for SS 304L Seamless Pipes
| NPS Designator | Outside Diameter (OD) Tolerance | Wall Thickness (WT) Tolerance |
| 1/8 to 1-1/2 | +0.4 mm / -0.8 mm | �12.5% of Nominal WT |
| Over 1-1/2 to 4 | � 0.8 mm | �12.5% of Nominal WT |
| Over 4 to 8 | +1.6 mm / -0.8 mm | �12.5% of Nominal WT |
| Over 8 to 18 | +2.4 mm / -0.8 mm | �12.5% of Nominal WT |
| Over 18 to 24 | +3.2 mm / -0.8 mm | �12.5% of Nominal WT |
Manufacturing Process of SS 304L Seamless Pipes
The SS 304 Seamless pipe is made with the precise step-by-step methods that are given below.
1. Raw Material Sourcing
The billets are made of high-quality SS of high quality and purchased in ISO certified mills in order to guarantee the homogeneity of chemical composition and corrosion resistance.
2. Billet Heating & Piercing
Billets are heated and punched to create a hollow pipe with no weld-lines so that the construction is seamless, and its structural integrity is high.
3. Mandrel Drawing & Shaping
The pipes are pulled over mandrels to get the accurate outer diameter, wall thickness and length.
4. Heat Treatment & Annealing
The austenitic structure is regained, internal stress is relieved and corrosion resistance is enhanced.
5. Pickling & Passivation
Pipes are pickled to eliminate the oxides and passivated to strengthen the protective layer of chromium oxide.
6. Dimensional Inspection & Surface Inspection
All of the seamless pipe OD, wall, straightness, and surface finish are inspected against ASTM A312 TP304L standards.
7. Hydrostatic Testing Non-Destructive Testing
The tests made are Eddy current, ultrasonic and hydrostatic pressure tests to give defect-free pipes that can withstand high pressures.
8. Certification & Dispatch
It offers Mill Test Certificates (MTC), which are offered in order to trace the products. Pipes are also well-packed in order to deliver to the global market, which includes the USA, Europe, the Middle East, and LATAM countries.
Material Testing & Quality Control
All SS 304L seamless pipes provided by Metinox Overseas are thoroughly controlled in terms of quality assurance to meet international standards, reliability, and durability.
Positive Material Identification (PMI) Test
PMI testing is carried out to ensure precise chemical composition of each pipe, so that it complies with the requirements SS 304L / UNS S30403 and dispel all chances of misgraded material.
Hydrostatic Pressure Test
Tests of all the pipes are conducted under controlled pressure conditions to ascertain whether they can be able to stand high internal pressure without leakage assuring safety under high-pressure piping systems.
Non-Destructive Testing (NDT)
Ultrasonic and Eddy current inspection are conducted to identify the surface and subsurface flaws, to provide the structural integrity of every pipe.
Dimensional Inspection and Visual Inspection
Pipes are inspected to ensure that they are of proper outer diameter, wall thickness, length, straightness and finish according to ASTM A312 tolerances and customer specifications.
Third-Party Inspection (Optional)
Export and similar critical projects may be inspected by the agencies such as TUV, BV, or SGS to certify the quality, traceability and conformity to international standards.
Documentation and Mill Test Certificate (MTC)
A Mill Test Certificate (MTC) is provided in each pipe as per EN 10204 3.1 in order to ensure that the finished product can be traced back to its raw material.
Equivalent Grades & Standards of SS 304 Seamless Pipe
| USA (ASTM) | European (EN) | German (DIN) | Japanese (JIS) | British (BS) | UNS Designation |
| TP304 | 1.4301 | X5CrNi18-10 | SUS 304 | 304S31 | S30400 |
| TP304L | 1.4307 | X2CrNi18-9 | SUS 304L | 304S11 | S30403 |
| TP304H | 1.4948 | X6CrNi18-11 | SUS 304H | 304S51 | S30409 |
Different Types of SS 304L Seamless Pipes
| Pipe Type | Manufacturing Method | Primary Application | Key Characteristic |
| Hot Rolled Seamless | Extruded/Pierced at 1200�C+ | Heavy industrial fluid transport, structural supports. | Scaled/Pickled finish, thick wall capability. |
| Cold Drawn Seamless | Pulled through dies at room temperature | Precision machinery, heat exchangers, instrumentation. | High-dimensional accuracy and smooth surface finish. |
| Hydraulic Pipe | Cold drawn with tight ID/OD tolerances | High-pressure hydraulic systems, aircraft fluid lines. | Tested for high burst pressure and internal cleanliness. |
| Honed Tubes | Internal surface is ground/honed | Hydraulic and pneumatic cylinders. | Mirror-smooth internal diameter (Ra < 0.4 �m). |
| Sanitary Pipe | Electropolished / BA Finish | Food, dairy, and pharmaceutical processing. | Designed to prevent bacterial growth; easy to clean. |
| Coiled Seamless Pipe | Continuous extrusion in long lengths | Control lines, subsea umbilicals, chromatography. | Flexible; eliminates the need for many weld joints. |
Advantages of SS 304L Seamless Pipes
The SS 304L Seamless pipes come with many advantages, and among them some of them are given below.
1. High Quality Corrosion Resistance
SS 304L smooth pipes are not affected by chemicals, water, and the air environment and are therefore suitable for industrial and marine applications.
2. High Strength & Durability
Fluid construction offers a high level of mechanical strength, pressure resistance, and long service in harsh surroundings.
3. Smooth Surface Finish
In hygienic and aesthetic designs, hygienic (annealed, pickled (AP), bright annealed (BA), mechanical polished (MP) and electropolished (EP) finishes are available.
4. Weld-Free Integrity
Smooth pipes will eliminate weld-flaws, and will be reliable in high pressure, high temperature, and high-stakes systems.
5. Wide Temperature Range
SS 304L is tough and stable in cryogenic temperatures down to -196�C and high service temperatures up to 870�C.
6. No Problems with Fabrication and Maintenance
It has low carbon content, which enhances weldability and decreases the possibility of carbide precipitation, thus making fabrication and long-term maintenance easier.
7. Versatile Applications
Applicable in chemical, petrochemical, food & beverage, pharmaceutical, oil and gas, water treatment, and architectural industries.
8. Cost-Effective & Long-Lasting
SS 304L seamless pipes are cheaper alternatives to welded pipes because they are easy to maintain and have high durability.
Applications of SS 304L Seamless Pipes
The SS 304L seamless pipes are used in many industries and some of the common ones are given below.
Oil & Gas Industry
Applied in pressure lines, gas distribution and offshore piping because of very high resistance to corrosion and high strength under extreme conditions.
Chemical and Petrochemical Plants
Works with corrosive chemicals and process fluids with minimum maintenance, which will guarantee safe and efficient work.
Food & Beverage Processing
The hygienic inner surfaces are smooth and therefore do not get contaminated thus are suitable in dairies, breweries and beverage industries.
Pharmaceutical and Biotechnology
Applied in clean steam lines, WFI (Water for Injection), and other important utilities that need sanitary standards.
Water Treatment & Utilities
Corrosion and wear resistant, used in potable water, industrial water and utility pipelines to ensure long life.
Construction, Architectural Applications
Offers permanent and attractive solutions of railings, piping and structural in contemporary buildings.
Industrial Plants and Power Generations
Uses include boiler tubes, heat exchangers, and high-temperature piping systems that are usually used because it is very strong and resistant to heat.
Marine and Offshore Applications
It is appropriate for shipbuilding, offshore platforms and desalination plants because it has corrosion resistance in saline environments.
Why Choose Metinox Overseas?
Here are some reasons why you should choose Metinox Overseas to get SS 304L seamless pipes.
- ISO-Certified: The product is produced according to the ISO 9001:2015 standards.
- Reliable Experience: More than 45 years of experience in SS products.
- Broad Pressure Fitting: Fittings, flanges, and pipe, tube, fittings, and pipe of various grades.
- International Exports: The USA, Europe, the Middle East, and LATAM markets.
- Quick Delivery: There are warehouses that are strategically placed to make timely deliveries.
- Customer-Centric: Differentiated services, competitive prices, and responsive services.
- Qualified Personnel: Provides the product traceability, accuracy, and consistency.
Looking for High-Quality SS 304L Seamless Pipes?
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Frequently Asked Questions (FAQ)
The SS 304L is made up of 18�20% chromium, 8�13% nickel, =0.03% carbon, with small amounts of manganese, silicon, phosphorus, and sulfur.
The 304L has lower carbon content, making it better for welding and reducing carbide precipitation, while 304 is stronger at higher temperatures.
The Prices of the SS 304L seamless pipe vary by size, schedule, and quantity, but it is generally slightly higher than SS 304 due to its low-carbon specification.
SS 304L is highly corrosion-resistant, but it may rust in harsh chloride or acidic environments without proper care.
Yes, it performs well in moderate to high temperatures and high-pressure applications, making it ideal for chemical, petrochemical, and oil & gas industries.
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Supplier and Exporter of 304L Seamless Pipes in Countries
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