Stainless Steel 317 & 317L Seamless Pipes Manufacturer & Supplier
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Midland Alloys Inc. is a recognized manufacturer and supplier of Stainless Steel 317 and 317L seamless pipes for highly corrosive industrial applications. SS 317 and SS 317L are high-molybdenum austenitic stainless steel grades developed for superior resistance to pitting and crevice corrosion. Seamless pipe construction ensures uniform wall thickness, enhanced pressure resistance, and dependable performance in aggressive service conditions. The low-carbon variant, 317L, offers improved weld reliability and reduced sensitization after fabrication. These seamless pipes are manufactured in compliance with ASTM, ASME, and EN piping standards. We supply SS 317 / 317L seamless pipes in multiple sizes, schedules, and surface finishes with global export capability.
What Is 317 & 317L Seamless Pipe?
Stainless Steel 317 and 317L seamless pipes are molybdenum-rich austenitic stainless steel piping products designed for severe chemical and corrosive environments. Seamless manufacturing eliminates welded joints, improving mechanical strength and pressure reliability. Higher molybdenum content enhances resistance to localized corrosion compared to standard stainless steel grades. SS 317L contains reduced carbon, minimizing carbide precipitation during welding operations. These seamless pipes are commonly produced according to ASTM A312 for industrial piping systems.
Benefits of SS 317 & 317L Seamless Pipes
- Enhanced Pitting Resistance – High molybdenum content improves resistance to localized corrosion in chloride environments.
- Improved Crevice Corrosion Protection – Performs reliably in tight joints and stagnant chemical conditions.
- Seamless Dimensional Uniformity – Joint-free construction ensures consistent wall thickness and strength.
- Chemical Process Reliability – Maintains material stability when handling aggressive acids and chemicals.
- Pressure Stability Performance – Designed to withstand high internal pressures without structural failure.
- Thermal Endurance Capability – Performs consistently under elevated operating temperatures.
- Reduced Failure Risk – Absence of weld seams lowers fatigue and cracking potential.
- Long-Term Service Durability – Extended resistance to corrosion reduces maintenance and replacement cycles.
Specifications of SS 317 / 317L Seamless Pipes
Include nominal size, outside diameter, schedule, wall thickness, length, and surface finish as per ASTM A312.
Seamless Pipe OD : 1/8 -12" NPS
ASTM A312, ASTM A213, ASTM A269, ASTM A249
Seamless
Round, Square, Rectangular, Hydraulic Etc
Single Random, Double Random & Cut Length.
Plain End, Beveled End, Treaded
SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, SCH 80S, SCH60, SCH80, SCH120, SCH140, SCH160, SCH XXS, SCH XS
No. 2B - Mill finish/ Matte finish, No.8 - Mirror finish, No. 4 - Brushed finish, Bright, Annealing, Polished, Mirror
Types of 317 & 317L Seamless Pipes
Stainless Steel 317 and 317L seamless pipes are available in multiple forms to meet diverse industrial piping requirements. Each type is engineered for corrosive, pressure-driven, and process-oriented environments.
Pipe Forms
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Round Seamless PipeUsed for chemical and process fluid transfer
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Schedule PipesManufactured for specific pressure ratings
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Heavy Wall PipesSuitable for high-stress corrosive service
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Precision PipesUsed where dimensional accuracy is critical
- Process Pipes
Designed for continuous industrial flow systems
Contact us today to discuss how Stainless Steel 317/317L Seamless Pipes can benefit your application. Whether you need guidance in selecting the right pipes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
| Grade | C (max) | Mn (max) | P (max) | S (max) | Si (max) | Cr | Mo | Ni |
| SS 317 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 18.0 – 20.0 | 3.0 – 4.0 | 11.0 – 15.0 |
| SS 317L | 0.035 | 2.00 | 0.045 | 0.030 | 0.75 | 18.0 – 20.0 | 3.0 – 4.0 | 11.0 – 15.0 |
| Grade | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness (Brinell) |
| SS 317 | 515 min | 205 min | 40 min | 217 max |
| SS 317L | 515 min | 205 min | 40 min | 217 max |
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 317 | 1.4449 | S31700 | SUS 317 | 317S31 | 03Ch17N14M3 | Z12CND17-13 | X2CrNiMo18-15-4 |
| SS 317L | 1.4438 | S31703 | SUS 317L | 317S12 | 03Ch17N14M3 | Z2CND17-12 | X2CrNiMo18-15-4 |
Stainless Steel Seamless Pipe Grades We Also Offer
How SS 317/317L Seamless Pipes Are Manufactured
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 SS 317 And 317L Seamless Pipes
SS 317 and 317L seamless pipes are widely used in industries requiring exceptional corrosion resistance. Typical applications include chemical processing equipment and petrochemical facilities handling aggressive media. These pipes are suitable for pulp and paper plants exposed to acidic environments. They are also used in heat exchangers and condensers operating under corrosive conditions. Offshore and marine installations rely on these grades for long-term durability.
Why Choose SS 317 & 317L Seamless Pipes from Midland Alloys Inc.
Midland Alloys Inc. supplies SS 317 and 317L seamless pipes manufactured with strict control over metallurgy and dimensional accuracy. Our pipes deliver superior corrosion resistance due to elevated molybdenum content, ensuring dependable performance in aggressive chemical environments. Seamless construction guarantees defect-free pressure handling and long service life. We adhere to international piping standards and implement comprehensive quality inspection procedures. Our export-ready packaging and documentation support global project requirements.
FAQs
They are used in highly corrosive chemical and industrial piping systems.
Higher molybdenum content improves resistance to pitting and crevice corrosion.
317L is preferred when improved weldability and reduced sensitization are required.
