317L Stainless Steel

Grade 317L | UNS S31703 | 1.4438

Alloy 317L is a molybdenum containing, low carbon austenitic stainless steel with increased additions of chromium, nickel, and molybdenum for better corrosion resistance and increased resistance to chemical attack for sulfurous, acetic, formic, citric, and tartaric acids.
Due to its low carbon content, 317L also provides resistance to sensitization when welded and higher creep, stress to rupture, and tensile strength at elevated temperatures.
It is non-magnetic in the annealed condition but may become slightly magnetic after welding.
Alloy 317L is commonly used to handle sulfur, pulp liquor, acid dyestuffs, acetylating and nitrating mixtures, bleaching solutions, severe coal and oil, and many chemical compounds.
Corrosion Resistance
•Demonstrates superior corrosion resistance in difficult environments including a wide range of chemicals, especially in acidic chloride environments
•Excellent resistance in applications where contamination is desired to be kept to a minimum
•Low carbon content allows 317L to be highly resistant to intergranular corrosion
•Combats the tendency to pit when in contact with phosphorus acids, chlorides, bromides, and iodides

Heat Resistance
•All chromium-nickel-molybdenum steels all have excellent resistance to oxidation
•Demonstrates a low rate of scaling in ordinary atmospheres at temperatures up to 1600-1650°F (871-899°C).

As with most steel plate products a number of different designations are used for these steels. The most common are:
•Type 317L 1.443 (EN Steel Number) S31703 (UNS)


Typical industrial sectors:

•Paper and pulp handling equipment
•Chemical and petrochemical processing equipment
•Condensers in fossil and nuclear fueled power generation stations
•Food processing equipment
•Textile equipment