High-Molybdenum Austenitic Stainless Steel Tube (UNS S31700 / EN 1.4449)
Product Overview
Seamless Stainless Steel TP317 Tube (UNS S31700 / EN 1.4449) is a high-performance austenitic stainless steel tube with elevated molybdenum content, designed for use in highly corrosive and high-pressure environments.
Manufactured through a seamless process (cold-drawn or hot-finished from a solid billet), TP317 tubes feature:
- No weld seams
- Uniform microstructure
- Superior mechanical strength
- Enhanced pressure resistance
Compared to welded tubes, TP317 seamless tubes provide greater reliability and safety in critical industrial systems.
Why Choose TP317 Stainless Steel Tube?
High Molybdenum Content (3.0% – 4.0%)
Improves resistance to:
- Pitting corrosion
- Crevice corrosion
- Chloride-induced attack
Improved Performance Over 316 Stainless Steel
TP317 is an upgraded version of 316/316L, offering:
- Better resistance to aggressive chemicals
- Longer service life in acidic environments
Excellent Thermal Stability
Maintains strength and oxidation resistance at elevated temperatures.
High Ductility & Fabrication Performance
- Easy to bend and form
- Ideal for heat exchanger tubing and complex piping systems
Key Advantages of TP317 Seamless Tube
1. Superior Corrosion Resistance
Performs exceptionally well in:
- Sulfuric acid
- Phosphoric acid
- Acetic acid
- Chloride-rich environments
2. High Pressure & Structural Integrity
Seamless construction eliminates weld defects, ensuring:
- Higher pressure tolerance
- Reduced failure risk
- Longer operational lifespan
3. Excellent Mechanical Properties
Balanced strength and ductility for demanding industrial applications.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Stainless Steel 317.
The composition of Stainless Steel 317 is carefully balanced to achieve its superior corrosion resistance and high strength.
Stainless Steel 317 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
Standards & Dimensional Tolerances
Manufactured in compliance with:
- ASTM A213 (Boiler & Heat Exchanger Tubes)
- ASTM A269 (General Service Tubing)
- ASTM A312
- EN 10216-5
Size & Manufacturing Standards
We supply TP316LN seamless tubes in compliance with global standards:
- ASTM A213 / ASME SA213
- EN 10216-5
- ASTM A269
With strict control of:
- Outer diameter (OD) tolerance
- Wall thickness tolerance
- Surface finish and dimensional accuracy
Common Industrial Applications
TP317 seamless stainless steel tubes are widely used in:
Chemical & Petrochemical Industry
- Reactors
- Heat exchangers
- Acid handling systems
Pulp & Paper Industry
- Bleaching systems
- Digesters
Marine & Offshore Engineering
- Seawater cooling
- Desalination plants
Food Processing Industry
- High-acid production lines
- Hygienic piping systems
Pharmaceutical & Food Industry
- High-purity process piping
- CIP/SIP systems
Manufacturing Process & Quality Control
Production Process
- Billet Heating
- Piercing (hollow shell formation)
- Cold Drawing / Hot Finishing
- Solution Annealing (≥1040°C, rapid quenching)
- Straightening & Finishing
Quality Assurance & Testing
All TP317 seamless tubes undergo strict inspection:
Non-Destructive Testing (NDT)
- PMI (Positive Material Identification)
- Eddy Current Testing (ET)
- Ultrasonic Testing (UT)
- Hydrostatic Testing
Mechanical Testing
- Flattening Test
- Flaring Test
- Hardness Test
Corrosion Testing
- Intergranular Corrosion Test
- Pitting Resistance Test
