SS 317 / 317L Welded Pipes Manufacturer
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Midland Alloys Inc. is a trusted manufacturer and supplier of SS 317 / 317L welded pipes. Our products are produced using controlled manufacturing procedures, welding accuracy, and extensive stainless steel expertise. We manufacture welded pipes using proven forming and fusion welding techniques that deliver dimensional consistency and reliable seam integrity across each batch. These stainless steel 317 welded pipe products are used in industrial, structural, and extremely corrosive applications where standard grades fall short. Our grades’ compliance with ASTM, ASME, and EN requirements is critical to our manufacturing discipline, ensuring consistent mechanical and chemical performance. Welded construction offers more flexibility in size ranges, wall thickness alternatives, and surface finishes, including mill finish and polished versions. The higher molybdenum content enhances resistance to pitting and chemical attack, while the lower carbon chemistry of 317L supports stable welding performance. As an ISO 9001 certified organisation, we maintain a ready stock to provide a dependable global supply for projects with tight schedules.
What is SS 317 & 317L Welded Pipe?
SS 317 and 317L welded pipes are produced by shaping stainless steel plates or coils into tubular form and welding the longitudinal seam to create a continuous pipe section. Precision forming is the first step in the manufacturing process, followed by controlled welding with current techniques to ensure joint strength and uniform penetration. Advanced welding controls make it easier to produce consistent seams with few faults, which is important in pressure- and corrosion-critical applications. These pipes show superior resistance to aggressive chemicals and chloride-rich environments due to increased molybdenum content compared to standard grades. As a result, SS 317 welded pipe and SS 317L welded pipe perform reliably in process lines where corrosion risk remains high over long periods of time. The lower carbon level in 317L reduces carbide precipitation near weld zones, improving weldability and long-term corrosion stability. This balance makes stainless steel 317 welded pipe a practical choice for demanding industrial systems.
Benefits of Welded 317 & 317L SS Piping
SS 317 and 317L welded piping provides a clear performance advantage in corrosive service while retaining fabrication flexibility and cost control. Welded construction supports dimensional accuracy and consistent wall thickness across long pipe lengths. Performance stays predictable.
- Enhanced corrosion resistance in chloride-rich and acidic process environments
- Superior pitting resistance due to higher molybdenum alloy content
- Weldability advantage of 317L, with reduced carbide precipitation risk
- Structural strength is maintained through controlled welded seam integrity
- Reliable pressure handling for medium- to high-pressure service lines
- Thermal stability across moderate to elevated operating temperatures
- Smooth internal surface supporting efficient fluid flow and cleaning
- Extended service life with reduced corrosion-related maintenance needs
Specification of Stainless 317 / 317L Welded Pipes
The following specifications define the dimensional range, standards compliance, and manufacturing scope for SS 317 and 317L welded stainless steel pipes. These pipes are supplied for industrial and structural use.
Seamless Pipe OD : 1/8 -12" NPS
ASTM A312, ASTM A213, ASTM A269, ASTM A249
Welded
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 SS 317 & 317L Welded Pipes
SS 317 / 317L welded pipes are suitable for corrosion-critical applications in which material stability is more important than visual appeal. These grades work well in marine, offshore, and chemical processing systems exposed to corrosive fluids and salts. A welded structure ensures durability while providing for versatile fabrication and sizing options. The pipes are available in various shapes to meet different industrial and structural requirements, without compromising corrosion resistance or weld quality.
All SS 317 / 317L welded pipes are made with welded construction techniques that balance strength, uniformity, and manufacturing convenience.
Pipe Forms
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Round PipeUsed for fluid transport and chemical process piping.
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Square PipeSuitable for structural frameworks and fabrication.
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Rectangular PipeApplied in construction and support structures.
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Polished PipeUsed in sanitary, decorative, and architectural applications.
- Process Pipes
Used in chemical, marine, and utility systems.
Contact us today to discuss how Stainless Steel 317/317L Welded 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
The chemical composition of SS 317 and 317L welded pipes is controlled by chromium-nickel-molybdenum ratios to ensure corrosion resistance, weld stability, and mechanical uniformity under severe service circumstances.
| 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 |
The mechanical properties of SS 317 and 317L welded pipes meet international standards, which ensure pressure integrity, structural stability, and long-term performance under various operating loads.
| 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 |
Stainless Steel Welded Pipe Grades We Also Offer
How SS 317/317L Welded 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 for SS 317 & 317L Welded Pipes
SS 317 and 317L welded pipes are often used in industries that experience corrosion, pressure, and chemical exposure. In oil and gas operations, they work with process fluids, offshore pipelines, and utility lines that are exposed to saltwater environments. Petrochemical and chemical processing industries rely on these pipes to carry acids, chlorides, and reactive substances without causing material loss. They are used in power generation facilities’ auxiliary systems and heat-affected service lines that operate at moderate temperatures. Food processing and water treatment industries value clean internal surfaces and resilience to harsh cleaning chemicals. Automotive plants use them in structural and fluid handling systems that must be durable. Welded 317/317L pipes are used in construction for load-bearing supports and exposed structures. Higher molybdenum concentrations enhance corrosion resistance, but reduced carbon levels in 317L improve weld integrity, manufacturing ease, and long-term durability.
Why Choose SS 317 & 317L Welded Pipes
SS 317 and 317L welded pipes are preferred when corrosion resistance must be consistent across extensive operation cycles. Their chromium-nickel-molybdenum combination is highly resistant to chemical deterioration, especially in chloride-rich and acidic environments. The higher molybdenum concentration promotes resistance to pitting and crevice corrosion, whereas 317L’s lower carbon chemical composition improves weldability and minimizes sensitivity to intergranular corrosion near weld zones. The welded design provides uniform wall thickness and reliable seam strength for pressure service. These pipes provide a long service life, consistent mechanical performance, and predictable behaviour under process stress. As an ISO-certified supplier of stainless steel 317 welded pipes, we focus on controlled manufacture and export-quality materials that meet global project requirements.
FAQs
SS 317 welded pipes are used in chemical processing, petrochemical plants, marine systems, and industrial pipelines that are subjected to corrosive fluids and chlorides.
Compared to SS 317, SS 317L has a lower carbon content, which enhances weldability and reduces the risk of corrosion at welded joints.
Yes. SS 317L welded pipes perform well in aggressive chemical and chloride-rich environments due to higher molybdenum content and stable weld zones.
