Stainless Steel 317L Pipe (UNS S31703 / WNR 1.4438) is a low-carbon austenitic stainless steel pipe and tube specified under ASTM A312 TP317L. Its composition 18–20% chromium, 11–15% nickel, and 3–4% molybdenum gives it superior resistance to pitting corrosion, crevice corrosion, and sulfuric acid attack compared to 316L. The "L" suffix limits carbon to 0.03% max, improving
weldability and eliminating intergranular sensitization. Amardeep Steel Centre stocks SS 317L Pipe and Tube in seamless, welded, ERW, and EFW forms from 1/8" to 24" NPS in all schedules. We serve chemical processing, marine, desalination, pulp & paper, pharmaceutical, and petrochemical industries with worldwide export from Mumbai and full documentation including EN 10204 3.1 MTC and IBR Form III-D.
What is Stainless Steel 317L Pipe?
Stainless Steel 317L Pipe is a low-carbon austenitic chromium-nickel-molybdenum alloy pipe and tube product. The grade is designated UNS S31703 under the Unified Numbering System and Werkstoff Nr. 1.4438 under European standards (DIN / EN). The "L" in 317L refers to the low-carbon variant, limiting carbon to a maximum of 0.03% — which is the critical factor that makes this grade superior for welded construction and high-temperature service.
Compared to the standard 317 grade (max 0.08% carbon), SS 317L pipe is less susceptible to intergranular corrosion after welding. This property, combined with its elevated molybdenum content (3–4%), gives 317L exceptional resistance to chloride pitting and crevice corrosion — outperforming 316L stainless steel in aggressive chemical environments.
Amardeep Steel Centre LLP is an established manufacturer, stockist, supplier, and exporter of Stainless Steel 317L Pipes and Tubes from Mumbai, India, supplying to industries across 50+ countries with complete test documentation.
ASTM A312 TP317L Standard & Specification Overview
Applicable ASTM, ASME, EN, and JIS standards for SS 317L Seamless and Welded Pipe
Core Standards
- Primary Standard: ASTM A312 / ASME SA312
- UNS Designation: S31703
- Werkstoff No.: 1.4438
- EN Designation: X2CrNiMo18-15-4
- JIS Designation: SUS 317L
- HS Code: 73061100
Other Applicable Standards
- ASTM A213 TP317L: Seamless ferritic/austenitic alloy tubes
- ASTM A249 TP317L: Welded austenitic steel boiler tubes
- ASTM A269 TP317L: Seamless/welded austenitic stainless steel tubing
- ASTM A358 TP317L: EFW pipe with filler metal permitted
- ASTM A409 TP317L: Large diameter (14"–30") light-wall EFW pipe
- ASTM A376 TP317L: Seamless pipe for high-temperature service
317 vs 317L Stainless Steel Pipe — Key Differences
Understanding why 317L is the specification of choice for welded pipe and high-temperature service
|
Property |
SS 317 Pipe |
SS 317L Pipe |
Advantage |
|
Carbon content (max) |
0.08% |
0.03% |
317L — lower sensitization risk |
|
Weldability |
Good |
Superior |
317L — no post-weld annealing required in most cases |
|
Intergranular corrosion resistance |
Moderate |
Excellent |
317L — preferred for welded construction |
|
Tensile strength (MPa min) |
515 |
515 |
Equal |
|
Yield strength (MPa min) |
205 |
205 |
Equal |
|
High-temp strength |
Slightly higher |
Slightly lower |
317 — for non-welded high-temp service above 425°C |
|
Price |
Slightly lower |
Marginal premium |
317L — better lifecycle value in corrosive environments |
|
Industry preference |
Rare, specific applications |
Industry standard |
317L — dominant specification globally |
317L vs 316L Pipe — Corrosion Resistance Comparison
Why engineers upgrade from 316L to 317L in severe chemical and marine environments
|
Property |
SS 316L Pipe |
SS 317L Pipe |
Winner |
|
Chromium content |
16–18% |
18–20% |
317L |
|
Molybdenum content |
2–3% |
3–4% |
317L — 33–50% more Mo |
|
Nickel content |
10–14% |
11–15% |
317L |
|
Chloride pitting resistance |
Good |
Superior |
317L |
|
Sulfuric acid resistance (<5%) |
Moderate |
Good |
317L |
|
Crevice corrosion resistance |
Good |
Superior |
317L |
|
Seawater / desalination |
Acceptable |
Preferred |
317L |
|
Cost |
Lower |
Higher |
316L (for standard environments) |
|
Availability |
Widely stocked |
Well stocked |
316L |
Engineering guidance: Specify 317L over 316L when operating in environments with >200 ppm chloride, sulfuric acid concentrations up to 5%, or flue gas desulfurization (FGD) scrubber service. The premium over 316L is typically 15–25% but delivers significantly better lifecycle performance.
SS 317L Pipe & Tube Specifications
Seamless Pipe Sizes
- Outside Diameter: 1/8" to 16" NPS
- Wall Thickness: 0.6 mm to 12.7 mm
- Length: Single Random, Double Random & Cut Length
- Schedule: 5S to XXH
- Dimensional Standard: ANSI/ASME B36.19M, ASME B36.10M
Welded / ERW / EFW Pipe Sizes
- Outside Diameter: 6.35 mm to 610 mm OD
- Wall Thickness: 0.8 mm to 12.7 mm
- Length: Up to 26 meters
- Schedule: 5S to 80S
- Large Diameter: Up to 24" NPS (ASTM A409)
Thick Wall Pipe Sizes
- Outside Diameter: 10 mm to 600 mm
- Wall Thickness: 2.5 mm to 100 mm
- Length: 0.5 m to 12 m
Available Forms & Finishes
- Shapes: Round, Square, Rectangular, Hex
- End Finish: Plain, Beveled, Threaded
- Surface Finish: 2B, No.1, No.4, No.8 Mirror, Polished
- Delivery Condition: Annealed & Pickled, Bright Annealed, Cold Drawn
- Custom Sizes: Available on request
Chemical Composition of 317L Stainless Steel
As per ASTM A312 / UNS S31703
|
Element |
Symbol |
Min % |
Max % |
Role |
|
Chromium |
Cr |
18.0 |
20.0 |
Primary corrosion resistance, passivation layer |
|
Nickel |
Ni |
11.0 |
15.0 |
Austenitic structure, toughness, formability |
|
Molybdenum |
Mo |
3.0 |
4.0 |
Enhanced pitting & crevice corrosion resistance |
|
Carbon (Low) |
C |
— |
0.03 max |
Low C prevents sensitization; key 317L differentiator |
|
Manganese |
Mn |
— |
2.0 |
Austenite stabilizer, deoxidizer |
|
Silicon |
Si |
— |
1.0 |
Oxidation resistance |
|
Phosphorus |
P |
— |
0.045 |
Controlled for toughness |
|
Sulfur |
S |
— |
0.030 |
Controlled for machinability vs. corrosion balance |
|
Nitrogen |
N |
— |
0.10 |
Strength enhancement |
Mechanical & Physical Properties of 317L Stainless Steel
Mechanical Properties (ASTM A312)
|
Property |
Value |
|
Tensile Strength (min) |
515 MPa (75,000 psi) |
|
Yield Strength 0.2% Proof (min) |
205 MPa (30,000 psi) |
|
Elongation in 50mm (min) |
35% |
|
Hardness Rockwell B (max) |
95 HRB |
|
Hardness Brinell (max) |
217 HB |
Physical Properties
|
Property |
Value |
|
Density |
8,000 kg/m³ (0.285 lb/in³) |
|
Melting Point |
1,371–1,421°C (2,500–2,590°F) |
|
Elastic Modulus |
193 GPa (29 × 10ⶠpsi) |
|
Thermal Conductivity (at 100°C) |
16.2 W/m·K |
|
Specific Heat (0–100°C) |
500 J/kg·K |
|
Electrical Resistivity |
720 n·Ω·m |
|
Service Temperature Max |
600°F (315°C) continuous |
317L Pipe Schedule Chart — Dimensions & Wall Thickness
OD and wall thickness in mm by pipe size (NPS) as per ANSI/ASME B36.19M
|
NPS (inch) |
OD (mm) |
SCH 5S (mm) |
SCH 10S (mm) |
SCH 40S (mm) |
SCH 80S (mm) |
SCH 160 (mm) |
|
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 |
|
1-1/2" |
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 |
Available Types of Stainless Steel 317L Pipe & Tube
317L Seamless Pipe
Extruded or rotary pierced with no weld seam. Ideal for high-pressure and critical service. ASTM A312 & A376.
317L Welded Pipe
Manufactured from plate or strip with a longitudinal weld. ASTM A312 & A358. Cost-effective for large diameters.
317L ERW Pipe
Electric Resistance Welded using high-frequency induction welding. Suitable for structural and low-pressure applications.
317L EFW Pipe
Electric Fusion Welded with filler metal permitted (ASTM A358). Suitable for corrosive and high-temperature service.
317L CDW Tube
Cold Drawn Welded tube with tight tolerances. Used in instrumentation and heat exchanger applications.
317L LSAW Pipe
Longitudinal Submerged Arc Welded pipe for large-diameter structural applications up to 24" NPS.
317L Capillary Tube
OD: 0.28 mm–10 mm. Used in instrumentation, medical and analytical equipment.
317L Square & Rectangular
Square and rectangular structural sections available in custom sizes with welded construction.
Seamless vs Welded vs ERW vs EFW — Which 317L Pipe Type to Choose?
|
Pipe Type |
Manufacturing Method |
Pressure Rating |
Size Range |
Best For |
Cost |
|
Seamless |
Extrusion / piercing — no weld seam |
Highest |
1/8"–16" NPS |
Critical service, high pressure, pulsating loads |
Highest |
|
EFW (A358) |
Fusion welded with filler metal |
High |
Up to 24" NPS |
Corrosive + high-temp, where filler permitted |
Medium-high |
|
Welded (A312) |
Longitudinal seam weld, no filler |
High |
Up to 24" NPS |
General corrosive service, larger diameters |
Medium |
|
ERW |
High-frequency induction, no filler |
Medium |
1/2"–24" |
Lower-pressure, structural, non-critical service |
Low |
|
CDW |
Cold drawn from welded tube |
Medium |
Small OD, tight tolerances |
Instrumentation, heat exchangers |
Medium |
UNS S31703 Equivalent Grades — International Standards
|
Standard |
Designation |
|
UNS (USA) |
S31703 |
|
Werkstoff Nr. (Germany/Europe) |
1.4438 |
|
EN / DIN |
X2CrNiMo18-15-4 |
|
JIS (Japan) |
SUS 317L |
|
ASTM |
TP317L / Type 317L |
|
ASME |
SA312 TP317L |
|
SS (Sweden) |
SS 2367 |
|
British Standard (Old) |
317S12 |
|
GOST (Russia) |
— |
|
AFNOR (France) |
Z2CND19-15-04 |
Testing & Inspection — Quality Assurance for 317L Pipe
Destructive Testing
- Tensile and yield strength (ASTM E8)
- Hardness test — Brinell and Rockwell (ASTM E10, E18)
- Charpy impact test
- Intergranular corrosion test (ASTM A262 Practice E)
- Flattening, bend, and flange tests
- Chemical analysis (ASTM E38, E1473)
Non-Destructive Testing (NDT)
- Ultrasonic Testing (UT) — ASTM E213
- Radiographic Testing (RT) — 100% X-ray on EFW
- Hydrostatic pressure test
- Pneumatic / air underwater test
- Positive Material Identification (PMI)
- Eddy current testing
Documentation supplied: EN 10204 3.1 Mill Test Certificate · IBR Form III-D · NABL Approved Lab Reports · Third-Party Inspection (SGS / Bureau Veritas / Lloyd's / TÜV / DNV) · Material Traceability Records · Heat Treatment Charts · Fumigation Certificates
Applications of Stainless Steel 317L Pipe & Tube
Chemical Processing
Reactors, storage tanks, process piping in sulfuric acid, hydrochloric acid, and chloride service
Desalination Plants
Seawater intake, brine handling, RO membrane housings — high-chloride resistance critical
Pulp & Paper
Digesters, bleaching equipment, washing systems — resistant to sulfurous compounds
Pharmaceuticals
Sterile process lines, clean-in-place systems — electropolished 317L tubing
Petrochemicals
Reformer tubes, heat exchanger tubes, column internals, offshore piping
FGD Scrubbers
Flue gas desulfurization — extreme sulfur dioxide and chloride attack resistance
Food & Beverage
Sanitary piping, dairy lines, CIP systems — easy to clean, FDA-compatible
Marine Engineering
Seawater cooling, ballast piping, offshore structural tubing
Power Generation
Condenser tubes, heat exchangers, steam piping in high-chloride cooling water
SS 317L Pipe Price — Indicative Price List
Note: Prices are indicative and subject to change based on LME, order quantity, size, and origin. Contact us for the latest 317L pipe price per kg.
|
Product |
Origin |
Approx. Price (USD/Tonne) |
Approx. Price (INR/kg) |
|
SS 317L Seamless Pipe (standard) |
Indian |
$1,200–$2,500 |
₹255–₹400 |
|
SS 317L Seamless Pipe (European) |
European |
$2,000–$4,000 |
₹400–₹600 |
|
SS 317L Welded / ERW Pipe |
Indian/Korean |
$800–$1,800 |
₹200–₹350 |
|
SS 317L Thick-Wall Pipe |
Multiple |
$2,500–$5,000 |
₹450–₹800 |
|
SS 317L Capillary Tube |
Multiple |
$5–$20/kg |
₹400–₹1,600 |
|
SS 317L Square / Rectangular Tube |
Indian/Korean |
$1,200–$2,200 |
₹220–₹380 |
* Prices exclude GST, freight, and customs duties. Contact Amardeep Steel for firm quotation with current pricing.
Certifications & Quality Standards
Test Certificates Available
- EN 10204 3.1 Mill Test Certificate (MTC)
- EN 10204 3.2 Third-Party MTC
- IBR Test Certificate — Form III-D
- NABL Approved Laboratory Reports
- Chemical & Mechanical Test Reports
- 100% Radiography Test Report (EFW)
- Ultrasonic Test Reports
- PMI (Positive Material Identification) Reports
- Heat Treatment Charts
- Material Traceability Records
- Fumigation Certificates (for export)
Third-Party Inspection Agencies Accepted
- SGS (Société Générale de Surveillance)
- Bureau Veritas (BV)
- Lloyd's Register
- TÜV Rheinland
- DNV (Det Norske Veritas)
- Intertek
- TPIA (Third Party Inspection Agency) on request
Company Certifications
- ISO 9001:2015 Quality Management System
- Government Recognized Export House
- IBR Approved Manufacturer
Export Countries — Worldwide Supply of SS 317L Pipe
Amardeep Steel Centre exports Stainless Steel 317L Pipes and Tubes to over 50 countries across Asia, the Middle East, Europe, Americas, and Africa from our Mumbai warehouse.
Packaging, Marking & Documentation
Standard Packaging
- Wooden pallets or cases — export seaworthy
- Waterproof plastic wrapping + bubble wrap
- Steel strip bundling for pipe bundles
- Plastic end caps to protect pipe bore
- PVC film for polished / decorative pipes
- Custom packaging as per buyer requirements
Pipe Marking (per ASTM A312)
- Manufacturer's name / symbol (Amardeep Steel)
- Material grade: TP317L
- Specification: ASTM A312 / ASME SA312
- Nominal Pipe Size (NPS) & Schedule
- Manufacturing method: SMLS / WELD
- Heat number for full traceability
- Weight (for export documentation)
Why Choose Amardeep Steel Centre for SS 317L Pipe?
Ready Stock, Mumbai
Common sizes in seamless and welded 317L pipe available ex-stock for immediate dispatch.
All Pipe Types
One supplier for seamless, welded, ERW, EFW, CDW, LSAW — all grades, all schedules.
EN 10204 3.1 MTC
Every pipe supplied with full Mill Test Certificate. 3.2 and third-party available on request.
IBR Approved
Form III-D certificates for boiler, pressure vessel, and power plant applications.
Multiple Origins
Indian, European (Outokumpu, Sandvik), Japanese, Korean, American origin material available.
Competitive Pricing
Direct procurement from mills + bulk stocking delivers best prices with no broker margin.
Fast Export Documentation
Full export documentation: COO, packing list, fumigation, weight certificate — within 24 hrs of dispatch.
Custom Cutting & Processing
OD/ID polishing, precision cutting, beveling, threading, machining available in-house.
Frequently Asked Questions — SS 317L Pipe & Tube
What is the difference between 317 and 317L stainless steel pipe?
The primary difference is carbon content. SS 317L has a maximum carbon of 0.03% versus 0.08% for standard 317. This lower carbon makes 317L far less susceptible to carbide precipitation during welding (sensitization), which would otherwise reduce corrosion resistance in the heat-affected zone. Both grades have the same tensile and yield strength minimums but 317L is almost universally specified for welded pipe applications.
Is 317L pipe better than 316L in corrosive environments?
Yes, in most corrosive environments. SS 317L contains 3–4% molybdenum (versus 2–3% in 316L), plus higher chromium and nickel. This gives 317L superior resistance to chloride pitting, crevice corrosion, and sulfuric acid attack. It is the preferred choice for applications involving seawater, FGD scrubbers, chloride-containing process streams, and pulp & paper liquors.
What is ASTM A312 TP317L?
ASTM A312 TP317L is the ASTM standard specification covering seamless and straight-seam welded austenitic stainless steel pipe. TP317L refers to the Type 317L alloy with UNS designation S31703. The standard specifies minimum tensile strength of 515 MPa, minimum yield strength of 205 MPa, and minimum 35% elongation. Filler metal is not permitted during welding under this standard (unlike ASTM A358 where it is permitted).
What is the price of SS 317L pipe per kg in India?
Indicative prices for SS 317L pipe in India range from approximately ₹255/kg for Indian-origin material to ₹400–₹600/kg for European or Japanese-origin material. Seamless pipe costs more than welded. Thick-wall and specialty sizes carry a premium. Prices fluctuate with nickel, molybdenum, and chromium LME prices. Contact Amardeep Steel Centre for a firm, quantity-specific price list.
What certifications do you provide with SS 317L pipe?
We supply EN 10204 3.1 Mill Test Certificate as standard. Additionally available: EN 10204 3.2 (third-party counter-signed), IBR Form III-D, NABL-approved laboratory test reports, third-party inspection by SGS, Bureau Veritas, Lloyd's, TÜV or DNV, PMI reports, UT/RT reports, and full material traceability records.
Can SS 317L stainless steel pipe be welded?
Yes. The low-carbon designation (max 0.03% C) makes 317L one of the most weldable grades in the austenitic family. Standard welding processes — GTAW/TIG, GMAW/MIG, SMAW — are all applicable. Filler metal ER317L or ER317 is typically used. Post-weld annealing is usually not required for 317L, though solution annealing is recommended for maximum corrosion resistance in critical service.
What sizes of 317L pipe do you stock in Mumbai?
We maintain ready stock of SS 317L Seamless Pipe from 1/8" to 12" NPS and Welded Pipe from 6.35 mm to 114.3 mm OD in Mumbai. Common schedules (SCH 5S, 10S, 40S, 80S) are ex-stock. Larger sizes and special schedules are available with 3–6 week lead times. Contact us with your requirement for a stock availability check.
Do you export SS 317L pipe internationally?
Yes. Amardeep Steel Centre exports SS 317L Pipe and Tube to 50+ countries including USA, UK, UAE, Saudi Arabia, Germany, Singapore, Australia, Canada, Qatar, and South Africa. We provide complete export documentation: commercial invoice, packing list, certificate of origin, fumigation certificate, weight certificate, and EN 10204 3.1 MTC. Typical delivery for Middle East is 7–15 days, Europe/USA 20–35 days from dispatch.
What is UNS S31703?
UNS S31703 is the Unified Numbering System designation for Type 317L stainless steel. It is also known as Werkstoff Nr. 1.4438, DIN 1.4438, EN X2CrNiMo18-15-4, and JIS SUS317L. The UNS number is used primarily in North American specifications (ASTM, ASME) while the EN/DIN designations are used in European standards.
Related Products
- Stainless Steel 316L Pipes & Tubes
- Stainless Steel 321 Pipes & Tubes
- Stainless Steel 904L Pipes & Tubes
- Duplex 2205 Pipe
- Stainless Steel 317L Flanges
- Stainless Steel 317L Flanges
Get a Competitive Quote for Stainless Steel 317L Pipes & Tubes
Amardeep Steel Centre supplies SS 317L Pipe & Tube in seamless, welded, ERW, and EFW forms with complete documentation including EN 10204 3.1 MTC, IBR Form III-D, and third-party inspection on request. Ready stock available in Mumbai with worldwide export capability.
