Properties & Processing Characteristics of Stainless Steel 317/317L
- Essentially similar to T-316; but the increased chromium, nickel and molybdenum content results in better corrosion resistance, higher tensile strength and higher creep strength than T-316.
- Superior corrosion resistance in difficult environments.
- Lower intergranular precipitation
- Resistance to pitting and crevice corrosion making 317L a successful life-cost product in a variety of highly corrosive environments.
- T-317L with .03% maximum carbon content is used to restrict carbide precipitation during welding and in applications where maximum corrosion resistance is required. In fact, for small quantities, T-317 is frequently available only as T-317L.
- T-317 is non-magnetic in the annealed condition and is non-hardenable by heat treatment. Machinability is 39% – 65 surface feet per minute.
- Higher creep, stress-to-rupture and tensile strengths than other stainless steels.
- Reduced intergranular precipitation of chromium carbides during welding and stress relieving as well as minimized possibility of corrosion failure from intergranular attack due to low carbon content.
- Improved general and localized corrosion to 316L stainless
- Good formability
- Good weldability
317L is readily welded by a full range of conventional welding procedures (except oxyacetylene). AWS E317L/ER317L filler metal or austenitic, low carbon filler metals with molybdenum content higher than that of 317L, or a nickel-base filler metal with sufficient chromium and molybdenum content to exceed the corrosion resistance of 317L should be used to weld 317L steel.
Fabrication Data & Other Properties of Stainless Steel 317/317L
Alloy 317L can be easily welded and processed by standard shop fabrication practices.
- Low speeds and constant feeds will minimize this alloy’s tendency to work harden. Tougher than 304 stainless with a long stringy chip, the use of chip breakers is recommended. The cold work hardening rate of Alloy 317L makes it less machinable than 410 stainless steel.
All common fusion and resistance methods except oxyacetylene welding have proven successful. Use AWS E/ER317 or 317L filler metal for best results. Alloy 317L can be readily welded by most standard processes. A post weld heat treatment is not necessary.
All common hot working processes are possible with this alloy. Heat to 2100-2300 F (1149-1260 C). Avoid working this material below 1700 F (927 C). For optimum corrosion resistance, a post-work annealing is recommended. If the final forming temperature falls below this threshold, a solution anneal of 1976–2156°F (1080–1180°C) is necessary. Rapid quenching is required.
Shearing, stamping, heading and drawing can be successfully performed . To remove internal stresses, a post-work annealing is recommended. The alloy is quite ductile and forms easily. The addition of molybdenum and nitrogen implies more powerful processing equipment may be necessary when compared with the standard 304/304L grades.
1850-2050 F (1010-1121 C), followed by rapid cooling.
This alloy does not respond to heat treatment. Cold work will cause an increase in both hardness and strength.