Stainless Steel 317 Pipes & Tubes

Stainless Steel 317 Pipes & Tubes Supplier, Exporter & Stockist in India

Amardeep Steel Centre is a stainless steel 317 pipe supplier, exporter and stockist with ready stock in Mumbai and export to 80+ countries. We supply under ASTM A312 TP317 (UNS S31700, WNR 1.4449) specifications in seamless, welded, ERW, and EFW construction, covering ½" NB to 24" NB as standard, with EFW pipe extending up to 100" NB for large-bore process piping. Every consignment of stainless steel 317 pipes ships with full mill test certification and optional third-party inspection, so buyers across industries can specify with confidence.

As a long-established 317 stainless steel pipe stockist, we hold ready inventory across common sizes and schedules, which means shorter lead times than mills that produce only against confirmed orders. Whether your requirement is small-diameter 317l pipe for instrumentation lines or large stainless steel 317 efw pipes for process headers, we carry the depth of stock to support both project quantities and urgent replacement orders. Engineers most often turn to 317 for its corrosion resistance in aggressive process chemistry compared with standard stainless steel 316 pipe, and where high-temperature stability matters more than pitting resistance, our stainless steel 321 pipe range may suit better; the technical reasons behind each choice are covered in the sections below. 

What is Stainless Steel 317 Pipe? Composition, Grade & Specification Overview

Stainless steel 317 pipe is a low-carbon, molybdenum-bearing austenitic stainless steel pipe manufactured under the ASTM A312 / ASME SA312 Grade TP317 specification, identified globally by UNS S31700 and Werkstoff Nr. 1.4449. It also appears under closely related specifications depending on the product form a buyer needs:

• ASTM A213 TP317: seamless 317l stainless steel tubing for heat exchangers, condensers, and instrumentation
• ASTM A249 TP317: welded tube for similar service where seamless isn’t mandated
• ASTM A358 TP317: large-diameter EFW pipe for structural and process piping above 8" NB

Because the same base chemistry is referenced across several ASTM numbers, buyers sourcing 317l stainless steel pipe or s31700 pipes will often see different spec numbers quoted by different mills for what is essentially the same material in a different manufacturing form. Knowing this helps avoid confusion during procurement and vendor comparison. 

Why Molybdenum Content Matters in SS 317 Pipe

Metallurgically, 317 sits a step above SS 316 pipe within the 300-series austenitic family. It carries the same 18–20% chromium and 11–15% nickel as 316, but molybdenum is raised to 3.0–4.0%, compared with 2.0–3.0% in standard 316. That additional molybdenum is the single biggest factor separating the two grades in real-world performance: it slows the initiation of pitting attack at microscopic surface defects where chloride ions concentrate, and it limits crevice corrosion in the stagnant, low-oxygen pockets that form under gaskets, flanges, and accumulated deposits. 

Where Stainless Steel 317 Pipes Outperform Standard 316

The higher molybdenum content translates directly into longer service life in halide-rich process streams, sulphuric and acetic acid handling, and chloride-laden marine or coastal atmospheres — exactly the conditions where standard 316 or 316L pipe tends to degrade over time. For this reason, engineers specify ss 317 pipes and stainless steel 317 tubes as a direct, drop-in upgrade for pulp and paper bleaching circuits, flue-gas desulphurization systems, fertilizer plant piping, and other chemical processing equipment with a documented history of premature 316 failure. 

Stainless Steel 317 Pipe Specifications (ASTM A312, A213, A249, A358)

These specifications apply uniformly whether you’re sourcing small-bore 317l pipe for tubing circuits or large-diameter stainless steel 317 welded tubing for structural process lines, giving project engineers a single reference point across product forms.

ASTM A312 TP317 Equivalent Grades for S31700 Pipes

Chemical Composition of SS 317 Pipe (% Weight)

The carbon ceiling is the key practical difference buyers should note: 317l stainless steel pipe caps carbon at 0.035% against 0.08% for standard 317, which significantly reduces the risk of carbide precipitation and sensitization at weld heat-affected zones. This is why 317l stainless steel tubing is so frequently the default choice for any application involving field welding or post-weld service in corrosive environments. 

Mechanical Properties of Stainless Steel 317 Pipe

These mechanical properties hold consistently across seamless, ERW, and EFW product forms of stainless steel 317 pipe, provided manufacturing and heat treatment follow the governing ASTM specification for that form.

SS 317 vs SS 316 vs SS 321 Pipe: Which Grade Do You Need?

If your process involves elevated chloride concentration, sulphuric or acetic acid exposure, or marine/coastal atmospheric conditions, 317 stainless steel pipe is generally the safer specification over standard 316. If the application instead involves sustained high-temperature service where intergranular corrosion from carbide precipitation is the dominant risk, SS 321’s titanium stabilization typically makes it the more appropriate grade. Still unsure which grade fits your process conditions? Talk to our technical team, or browse our full stainless steel pipes & tubes range for side-by-side comparisons across all 300-series grades we stock.

Need 317/317L pipe for a chloride or acid service? Send your size, schedule and quantity for a same-day quote → Request a Quote. 

Available Types of SS 317 Pipes & Tubes

Stainless Steel 317 Seamless Pipes

Stainless steel 317 seamless pipes are manufactured by hot extrusion or cold drawing per ASTM A312/A213 TP317. Seamless construction eliminates weld seams entirely, which removes a common failure point in high-pressure chemical lines, hydraulic tubing, and instrumentation circuits where joint integrity under pressure cycling is critical. Buyers prioritizing maximum reliability in critical service typically specify seamless over welded construction wherever budget and size range allow.

Stainless Steel 317 Welded Pipes

Stainless steel 317 welded pipes are produced via straight-seam fusion welding per ASTM A358/A409, and are the practical solution for large-diameter piping in process plants where seamless manufacture becomes impractical or cost-prohibitive above 8" NB. Welded construction allows project engineers to source large-bore pipe without the size limitations inherent to seamless extrusion.

Stainless Steel 317 ERW Pipes

Electric Resistance Welded ss 317 pipes offer a cost-effective alternative to seamless pipe for low-to-medium pressure applications, available ½" NB to 24" NB, with consistent wall thickness control across the full size range. ERW construction is frequently specified where budget constraints matter but corrosion performance still needs to match seamless-grade chemistry.

Stainless Steel 317 EFW Pipes

Electric Fusion Welded (EFW) pipe, manufactured per ASTM A358 TP317, is the standard solution for large-diameter stainless steel 317 welded tubing, covering 6" NB to 100" NB, and is widely used in penstocks, large process headers, and structural piping. Amardeep Steel Centre is a recognized ss 317 efw pipes manufacturer and stainless steel 317 efw pipes supplier, with 100% X-ray and ultrasonic-tested welds available on request for projects requiring documented weld integrity.

Stainless Steel 317 Pipe Size Chart 

Full size and schedule chart, including theoretical weight (kg/m) per size, is available on request: SS 317 pipe weight & dimension chart (PDF).

Dimensional tolerances on outside diameter and wall thickness follow ASTM A312 limits for the relevant schedule and product form; confirm exact tolerance values for your size on request. 

Manufacturing Process for SS 317 Pipes & Tubes

• Hot Finished Seamless (HFS)
• Cold Drawn Seamless (CDS)
• Electric Resistance Welding (ERW)
• Electric Fusion Welding (EFW)
• Submerged Arc Welding (SAW)
• 100% Radiography/Ultrasonic tested welds (on request)

Each manufacturing route is selected based on the size, wall thickness, and end-use pressure rating required for a given stainless steel 317 tube order, with hot finished and cold drawn seamless routes reserved primarily for smaller-diameter, higher-pressure applications.

All 317/317L pipe is supplied solution-annealed (approx. 1040–1120°C, rapidly quenched) to dissolve carbides and restore full corrosion resistance after forming or welding. 

Testing & Inspection of Stainless Steel 317 Pipes

Hydrostatic Test · Ultrasonic Test (UT) · Radiographic Test (RT) · Positive Material Identification (PMI) · Intergranular Corrosion Test (IGC) · Pitting Resistance Test · Flaring/Flattening Test · Macro & Micro Examination · Chemical & Mechanical Testing · Third-Party Inspection (SGS, BV, TUV, Lloyd’s on request) 

Every batch of stainless steel 317 pipes dispatched from our Mumbai facility undergoes the relevant tests above before release, with documentation issued alongside the shipment. Want to understand what each test actually verifies before you sign off on a mill test certificate? Read our guide on how to read a stainless steel mill test certificate.

Applications & Industries Served by SS 317 Pipe and Tube

• Chemical and petrochemical processing equipment
• Pulp & paper bleaching plants
• Marine and offshore piping systems
• Flue-gas desulphurization (FGD) systems
• Fertilizer industry piping
• Sulphuric and acetic acid handling lines
• Heat exchangers and condenser tubing

Across each of these industries, the common thread driving selection of stainless steel 317 pipe over standard 316 is sustained exposure to chlorides, sulphuric or acetic acid, or marine atmospheric chlorides where premature pitting failure carries a high cost in unplanned downtime. 

Packaging & Marking Standards for SS 317 Pipe Shipments

Each bundle of stainless steel 317 pipe is marked per ASTM A312 with manufacturer’s name, grade/type, heat number, dimensions, and batch ID, then bundled with anti-corrosive wrapping, wooden crating, or container-loaded packaging suitable for sea or air freight export, depending on destination and order volume. 

Why Choose Amardeep Steel for Stainless Steel 317 Pipes & Tubes

• Since 1984 of experience as a stainless steel pipe stockist and exporter
• Full documentation: EN 10204 3.1 MTC, IBR Form III-D, Certificate of Origin
• Material traceability from heat number to mill source
• Third-party inspection (SGS/BV/TUV) arranged on request
• Ready stock in Mumbai for fast dispatch
• ISO-certified quality systems
• Competitive ss 317l price with worldwide logistics support

Frequently Asked Questions: Stainless Steel 317 Pipes & Tubes

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