317L Stainless Steel Pipe
The 317L stainless steel pipe is a high-molybdenum low-carbon austenitic stainless steel pipe specially designed for resisting strong corrosive environments. Its resistance to chloride pitting and stress corrosion cracking is significantly superior to that of 316L, making it suitable for more demanding chemical and marine pipeline systems.
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Product Introduction

317L Stainless Steel Pipe is a premium austenitic stainless steel with enhanced molybdenum content (3-4%) compared to standard 316L (2-3%), providing superior corrosion resistance in aggressive chemical environments, particularly against chlorides, sulfuric acid, and phosphoric acid. The "L" designation indicates low carbon content (≤0.03%), which prevents sensitization during welding and ensures maintained corrosion resistance in heat-affected zones. This grade represents an intermediate solution between standard 316L and super austenitic stainless steels, offering enhanced performance for demanding applications without the premium cost of higher-alloy materials.

Available in seamless and welded configurations, 317L stainless steel pipe combines excellent corrosion resistance with good fabricability and weldability. Its higher alloy content makes it particularly suitable for chemical processing, pulp and paper, pollution control, and other aggressive environments where standard 316L may be marginal. The increased molybdenum content provides better resistance to pitting and crevice corrosion in chloride-containing environments, while the low carbon content ensures weld integrity without post-weld heat treatment requirements.

Product parameters


Item / Parameter

Specification for 317L Pipe

Notes / Significance

Key Feature

The Enhanced Molybdenum Austenitic Piping Solution. Higher molybdenum content (3-4%) provides superior corrosion resistance in aggressive chemical environments compared to 316L.

An intermediate solution between 316L and super austenitic grades for demanding corrosive applications.

Common Designations

UNS S31703
AISI 317L
ASTM A312 TP317L (Seamless/Welded)
EN 1.4438, X2CrNiMo18-15-4
JIS SUS317L

ASTM A312 is the primary specification for pressure pipe applications.

Chemical Composition (Typical wt.%)

C: ≤ 0.030
Cr: 18.0 - 20.0
Ni: 11.0 - 15.0
Mo: 3.0 - 4.0Mn: ≤ 2.00
Si: ≤ 0.75
P: ≤ 0.045
S: ≤ 0.030

Higher molybdenum than 316L (3-4% vs 2-3%) provides enhanced corrosion resistance.

Mechanical Properties

Tensile Strength: ≥ 515 MPa
Yield Strength: ≥ 205 MPa
Elongation: ≥ 40%
Hardness: ≤ 217 HB

Similar mechanical properties to 316L, with slightly higher potential strength.

Physical Properties

Density: 7.98 g/cm³
Melting Range: 1375 - 1400 °C
Thermal Expansion: 16.0 × 10⁻⁶/K (20-100°C)
Thermal Conductivity: 14.2 W/m·K (100°C)
Non-magnetic when annealed

Similar to 316L; slightly higher density due to increased molybdenum.

Corrosion Resistance

Excellent: PREN*: 29-32
Superior to 316L in: Chloride environments, sulfuric acid, phosphoric acid, organic acids.
Good resistance to stress corrosion cracking.

PREN 29-32 vs 316L's 24-26 provides better pitting/crevice corrosion resistance.

Welding Characteristics

Good weldability with standard methods
Low carbon prevents sensitization317L or higher alloy filler recommended
No post-weld annealing required

Similar weldability to 316L; matching or overmatching filler metals preferred.

Pressure Ratings

Schedule 5S/10S: Thin wall applications
Schedule 40S: Standard process piping
Schedule 80S/160: High pressure service
ASME B31.3 compliant

Similar pressure capabilities to 316L with same dimensions.

Temperature Limits

Continuous Service: Up to 425°C (for corrosion)
Higher Temp: Up to 870°C
Cryogenic Service: Excellent down to -196°C

Similar temperature capabilities to 316L.

Key Standards

ASTM A312 TP317L: Seamless & Welded Pipe
ASTM A358 TP317L: EFW Pipe
ASTM A269 TP317L: Tubing
EN 10216-5: Seamless Pressure Tubes
ASME SA312: Code Construction

Comprehensive standardization ensures quality and reliability.

Common Applications

• Chemical Processing: Sulfuric acid piping, phosphoric acid systems, chemical reactors
• Pulp & Paper: Digester piping, bleach plant systems, chemical recovery
• Pollution Control: Flue gas desulfurization (FGD) systems, scrubber piping
• Pharmaceutical: Aggressive chemical process piping, CIP systems
• Food Processing: Highly acidic food transport, aggressive cleaning systems
• Water Treatment: Chlorinated water systems, wastewater treatment
• Oil & Gas: Sour service applications, amine systems

Specifically selected for aggressive chemical environments beyond 316L capabilities.

Surface selection

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Packaging and transportation

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FACTORY SHOW

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FAQ

Q:What about your price? 
A:Our price is very competitive because we are a factory. Feel free to contact us if you are interested in our products. 

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase. 

Q:Does the product have quality inspection before loading? 
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we
accept the third party inspection absolutely. 

Q:How about the delivery time? 
A:Within 3-15 days after we confirm you requirement. 

Q:What is your terms of payment ?
A:T/T, L/C at sight, Cash, Western Union are all accepted if you have other payment,please contact me. 

Q: Do you provide samples? 
A:Yes,we could offer the sample for you to test but please pay freight fee.

Q:How do we trust your company? 
A:We are a specialized company focusing on global steel trading and supply chain services. Our mission is to provide high-quality, multi-specification, and one-stop steel products and solutions to customers worldwide.

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