SS 317 And 317L Seamless Tubes Supplier
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Midland Alloys Inc. is a top manufacturer and global supplier of high-quality stainless steel 317 seamless tube solutions. Our tubes are made from high molybdenum stainless steel tubes that are austenitic grade made to work well in tough conditions. Compared to standard grades, this material is more effective at resisting pitting and crevice corrosion. We make sure our tubes can handle high-pressure performance without the risks that come with welded seams by using a seamless construction. We also provide stainless steel 317L seamless tubing, which features a low-carbon content for much better weldability and strength after fabrication. Every 317 seamless tube manufacturer & supplier knows that precision matters, so we adhere to ASTM, ASME, and EN standards. We offer a wide range of outside diameters (OD), wall thicknesses, and surface finishes to meet your exact needs. Our process includes strict quality assurance and testing before we export our products to clients worldwide.
What is SS 317 & 317L Seamless Tubing?
SS 317 seamless tubing is a molybdenum rich austenitic stainless steel tube that is designed to be extremely durable. The 317 seamless tubes, in contrast to the welded ones, are made from a solid billet, so they do not have any seams that could potentially leak or fail. The 317L version is the low-carbon variant, which prevents sensitization during welding. These tubes are specifically built for use in aggressive chemical zones where standard steel would quickly break down. Most industries take advantage of these to ensure safety and long-term use under the specifications of ASTM A213, A269 or A312. Selecting SS 317L stainless steel seamless tubes guarantees that your system can handle even the most aggressive industrial fluids.
Benefits of SS 317 & 317L Seamless Tubing
- Enhanced Pitting Resistance – The high molybdenum content protects the metal from small holes in salty or acidic areas. This makes the SS 317 seamless tube benefits clear for marine and chemical uses.
- Improved Crevice Corrosion Protection – These tubes stop decay in tight gaps and under gaskets. This is one of the primary 317L seamless tubing advantages in complex machinery.
- Seamless Dimensional Uniformity – Each tube has a consistent wall thickness and diameter. This smooth design allows for better flow and easier fitting.
- Chemical Process Reliability – The metal stays strong even when carrying harsh acids. You can trust these tubes to last in tough processing plants.
- Pressure Stability Performance – The seamless build allows the tubes to hold high internal pressure. This keeps your entire operation safe from bursts or leaks.
- Thermal Endurance Capability – These tubes maintain their shape and strength in high-heat zones. They do not warp or lose integrity when temperatures rise.
- Reduced Failure Risk – Without a weld line, there is no weak point for cracks to start. This lowers the chance of unexpected downtime or repairs.
- Long-Term Service Durability – The tough alloy resists wear and tear for many years. This saves money on replacement costs over the life of the project.
Specifications of SS 317 & 317L Seamless Tubing
Our technical specifications cover everything from size ranges to surface treatment. We ensure every tube meets international quality marks for size and thickness.
Seamless Tube OD : 1 / 2" NB - 16" NB
ASTM A213, A269, A249, A511, A554 / ASME SA213, SA269, SA249, SA511, SA554
Seamless
Round, Square, Rectangular, Hydraulic Etc
Single Random, Double Random, Standard & Cut length
Plain Ends (PE), Threaded Ends (TE), Bevelled Ends (BW), Grooved Mechanical Joints or Grooved Ends, TBE (Treaded Both Ends)
SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Tubes, Finish as per customer Requirements
Contact us today to discuss how Stainless Steel 317/317L Seamless Tubes can benefit your application. Whether you need guidance in selecting the right Tubes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
Chemistry of these tubes is based on high levels of molybdenum and chromium for maximum protection. The 317L grade keeps carbon levels low to thus help with better welding results.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 317 | min. | – | – | – | – | – | 18.0 | – | 11.0 | – |
| max. | 0.8 | 2.0 | 1.00 | 0.040 | 0.03 | 20.0 | 14.0 | – | ||
| 317L | min. | – | – | – | – | – | 18.0 | 3.00 | 11.0 | – |
| max. | 0.03 | 2.0 | 0.75 | 0.040 | 0.03 | 20.0 | 4.00 | 15.0 | – | |
These tubes offer high tensile strength and yield strength for heavy-duty use. They also show great elongation properties, making them flexible enough for various shapes.
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
| 0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C | |||||
| 317 | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
| 317L | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
Stainless Steel Tubes Grades We Offer
Types of Stainless Steel 317 / 317L Seamless Tubes
We offer various 317L seamless tube forms to fit different technical needs. These tubes are vital for corrosive and process-driven environments where material failure is not an option. Depending on your project, you can choose from these common SS 317 seamless tube types:
TUBES Forms
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Round TubeThese are the standard choice for chemical and process fluid handling because they manage internal pressure evenly.
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Square TubeThese provide strong structural support in highly corrosive zones where weight must be distributed across flat surfaces.
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Rectangular TubeBest used for building equipment frames and assemblies that require extra strength and stability in one direction.
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Boiler TubeBuilt to withstand the extreme stress and scaling found in high-temperature thermal systems and steam generation.
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Heat Exchanger TubeOptimized for efficient heat transfer in heating and cooling units for industry by having thin, strong walls.
Round Bar
Analytic
Cut to Length
Centering
Heating
Perforation
Inspection of Size
Pickling
Inspection of Surface
Lubricating
Cold Drawing (Cold Rolling)
Degreasing
Annealing
Straightening
Cut
Pickling / Passivating
Inspection
Analytic
Marking
Packing & Shipping
Industrial Applications of Stainless 317 & 317L Seamless Tubes
There are many 317L stainless steel tubing uses across several heavy industries. These SS 317 seamless tube applications include:
- Chemical processing equipment – These tubes carry highly corrosive liquids and help build tanks that store strong organic and inorganic acids.
- Petrochemical facilities – They are used in refining units where high pressure and high heat are daily factors in production.
- Pulp and paper plants – The material resists the harsh bleaching agents and chlorides that quickly eat through lower-grade steel.
- Heat exchangers and condensers – These tubes work well in power plants and refineries that require efficient cooling in salt-heavy or humid areas.
- Acid handling systems – They are the top choice for piping that must move sulfuric or phosphoric acids safely without leaking.
- Offshore and marine installations – These tubes stay strong when exposed to constant salt spray and deep-sea moisture that ruins other metals.
Why Choose Midland Alloys Inc. for 317 / 317L Seamless Tubes
Midland Alloys Inc. is a trusted 317L seamless tube supplier that exports globally. To make sure we always deliver high-quality SS 317 seamless tubes we focus on material expertise and precise manufacturing. Our team follows strict quality control and international standards to ensure safety. We provide export-ready packaging and all the necessary paperwork to make your shipping process simple and fast.
FAQs
They are used to move chemicals and gases in places where standard steel would rust or fail. You will find them in paper mills, chemical plants, and oil rigs.
It contains more molybdenum than other grades. This extra ingredient helps it fight off acid attacks and pitting better than common stainless steel.
Choose the 317L version if you plan on welding the tubes. The lower carbon helps prevent the metal from becoming brittle or corroding at the weld spots.
