Alloy 317 (UNS S31700, 1.4449) supplier, contact us to get free quote and sample!
Alloy 317 (UNS S31700, 1.4449) is a corrosion-resistant austenitic stainless steel with a combination of chromium, nickel, and molybdenum, providing excellent resistance to a variety of corrosive environments. AISI 317 is widely used in chemical processing, petrochemical, power plants, like boilers, heat exchangers, etc.
Common Applications For Alloy 317 Stainless Steel:
1. Chemical Processing:
Alloy 317 is widely used in the chemical processing industry for equipment and components exposed to corrosive chemicals, acids, and solvents. It performs well in applications involving sulfuric acid, acetic acid, and other corrosive substances.
2. Petrochemical Industry:
Components in the petrochemical industry, such as pipelines, valves, and reactors, often utilize AISI 317 due to its resistance to corrosive environments found in oil and gas processing.
3. Power Generation:
ASTM A213 TP317 tube is employed in power plants, particularly in components like boilers, heat exchangers, and superheaters where resistance to high-temperature and corrosive conditions is essential.
4. Food and Beverage Industry:
In the food and beverage sector, En 1.4449 AISI 317 is utilized for equipment and machinery exposed to corrosive cleaning agents and acidic food products. Its corrosion resistance is crucial in maintaining hygiene standards.
5. Pharmaceutical Manufacturing:
Equipment used in pharmaceutical manufacturing, such as reactors and storage tanks, often incorporates ASTM A240 UNS S31700 material due to its corrosion resistance and compatibility with pharmaceutical processes.
6. Textile Industry:
ASTM A312 stainless 317 finds applications in dyeing and finishing equipment in the textile industry where resistance to corrosive chemicals is required.
7. Paper and Pulp Industry:
Alloy 317 UNS S31700 is used in the paper and pulp industry for components like digesters and bleach washers, where resistance to chemicals and high temperatures is necessary.
8. Aerospace Components:
Certain aerospace applications may utilize Alloy 317 steel in components such as exhaust systems where corrosion resistance and high-temperature stability are crucial.
9. Marine Equipment:
ASTM A213 TP317 tube is employed in marine environments for equipment, fittings, and components where resistance to saltwater corrosion is important.
10. Heat Exchangers:
Due to its corrosion resistance and ability to withstand high temperatures, 317 stainless steel tubing is used in the fabrication of heat exchangers for various industries.
11. Flue Gas Desulfurization (FGD) Systems:
In FGD systems, DIN 1.4449 alloy 317 is used for components exposed to corrosive gases, providing resistance to sulfur dioxide and other acidic substances.
These applications highlight the versatility of ASTM A213 UNS S31700 in industries where corrosion resistance, high-temperature performance, and durability are paramount. When using this material, it's crucial to follow proper fabrication and welding practices to maintain its performance characteristics.
Chemical Composition Comparison
| Alloy Grade | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Carbon (C) | Manganese (Mn) | Silicon (Si) |
| SS 317 (UNS S31700) | 18.0 - 20.0 | 11.0 - 15.0 | 3.0 - 4.0 | $\le$ 0.08 | $\le$ 2.00 | $\le$ 0.75 |
| SS 317L (UNS S31703) | 18.0 - 20.0 | 11.0 - 15.0 | 3.0 - 4.0 | $\le$ 0.03 | $\le$ 2.00 | $\le$ 0.75 |
Why Choose 317L Over 316L?
While standard 316L is the baseline choice for marine and chemical processing, severe process streams require the enhanced composition of Alloy 317L:
Elevated Molybdenum Content: Containing 3.0% to 4.0% Mo (compared to 2.0%–3.0% in 316L), 317L provides a significantly higher Pitting Resistance Equivalent Number (PREN), making it highly resilient against aggressive halide environments containing chlorides or bromides.
Superior Creep Strength: The alloy demonstrates excellent mechanical properties under thermal stress, providing higher creep-to-rupture limits and tensile performance than standard 18-8 stainless steels.
Excellent Fabricability: 317L can be easily formed and welded using standard shop fabrication practices. Utilizing matching composition filler metals, such as ER317L, ensures the weld zone maintains identical corrosion resistance to the base metal.
Product Configurations and Design Standards Available
To ensure seamless integration with your pipeline engineering projects, HT PIPE fabricates and tests all 317L components to strict international metrics:
Pipes & Tubes: Seamless and Welded per ASTM A312 / ASME SA312 TP317L (Sizes up to 24" NPS seamless).
Plates & Sheets: Hot-rolled and cold-rolled finishes per ASTM A240 / ASME SA240, custom cut-to-size via waterjet or plasma processing.
Pipe Fittings: Long/Short Radius Elbows, Equal/Reducing Tees, Concentric and Eccentric Reducers manufactured to ASTM A403 WP317L.
Flanges: Slip-on, Weld Neck, Blind, and Lap Joint Flanges compliant with ASME B16.5 pressure classes from Class 150 to Class 2500.
