UNS S31703 stainless

317L is molybdenum-bearing austenitic stainless steel with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steels such as Type 304. 317L alloy also offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures than conventional stainless steels. The alloy has low carbon to provide resistance to sensitization during welding and other thermal processes. This alloy is intended for severe service conditions such as flue gas desulfurization (FGD) systems.
 

Chemical Composition - Stainless Steel 317/317L

Grade	317	317L
UNS Designation	S31700	S31703
Carbon (C) Max.	0.08	0.035*
Manganese (Mn) Max.	2.00	2.00
Phosphorous (P) Max.	0.040	0.04
Sulphur (S) Max.	0.03	0.03
Silicon (Si) Max.	1.00	1.00
Chromium (Cr)	18.0–20.0	18.0–20.0
Nickel (Ni)	11.0–14.0	11.0–15.0
Molybdenum (Mo)	3.0–4.0	3.0–4.0
Nitrogen (N)	—	—
Iron (Fe)	Bal.	Bal.
Other Elements	—	—

Typical Mechanical Properties- Stainless Steel 317L

Material	Ultimate Tensile Strength (Mpa)	0.2 % Yield Strength (Mpa)	% Elongation in 2"	Rockwell B Hardness
Alloy 317	515	205	35	95
Alloy 317L	515	205	40	95
Minimum Mechanical Properties by ASTM A240 and ASME SA 240

Physical Properties	Metric	English	Comments
Density	8 g/cc	0.289 lb/in³
Mechanical Properties
Hardness, Brinell	Max 217	Max 217	ASTM A240
Tensile Strength, Ultimate	Min 515 MPa	Min 74700 psi	ASTM A240
Tensile Strength, Yield	Min 205 MPa	Min 29700 psi	ASTM A240
Elongation at Break	Min 40 %	Min 40 %	ASTM A240
Modulus of Elasticity	200 GPa	29000 ksi
Electrical Properties
Electrical Resistivity	7.9e-005 ohm-cm	7.9e-005 ohm-cm
Magnetic Permeability	1.0028	1.0028	fully annealed 0.5″ plate; 1.0028 65% cold-worked 0.5″ plate

 

317L(1.4438) General Property

Alloy 317LMN and 317L are molybdenum-bearing austenitic stainless steel tube with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steel pipe such as Alloy 304. In addition, 317LMN and 317L alloys offer higher creep, stress-to-rupture, and tensile strengths at elevated temperatures than conventional stainless steels. All are low carbon or "L" grades to provide resistance to sensitization during welding and other thermal processes.

The "M" and "N" designations indicate that the compositions contain increased levels of molybdenum and nitrogen respectively. The combination of molybdenum and nitrogen is particularly effective in enhancing resistance to pitting and crevice corrosion, especially in process streams containing acids, chlorides, and sulfur compounds at elevated temperatures. Nitrogen also serves to increase the strength of these alloys. Both alloys are intended for severe service conditions such as flue gas desulfurization (FGD) systems.

In addition to excellent corrosion resistance and strength properties, the Alloys 316, 316L, and 317L Cr-Ni-Mo alloys also provide the excellent fabricability and formability which are typical of the austenitic stainless steel tubing .

317L (1.4438) Heat Treatment
Annealing
The austenitic stainless steel pipe are provided in the mill annealed condition ready for use. Heat treatment may be necessary during or after fabrication to remove the effects of cold forming or to dissolve precipitated chromium carbides resulting from thermal exposures. For the Alloys 316 and 317L the solution anneal is accomplished by heating in the 1900 to 2150°F (1040 to 1175°C) temperature range followed by air cooling or a water quench, depending on section thickness. Cooling should be sufficiently rapid through the 1500 to 800°F (816 to 427°C) range to avoid reprecipitation of chromium carbides and provide optimum corrosion resistance. In every case, the metal should be cooled from the annealing temperature to black heat in less than three minutes.

Forging
The recommended initial temperature range is 2100-2200°F (1150-1205°C) with a finishing range of 1700-1750°F (927-955°C).

Annealing
317LMN and Alloy 317L stainless steels can be annealed in the temperature range 1975-2150°F (1080-1175°C) followed by an air cool or water quench, depending on thickness. Plates should be annealed between 2100°F (1150°C) and 2150°F (1175°C). The metal should be cooled from the annealing temperature (from red/white to black) in less than three minutes.

Hardenability

• These grades are not hardenable by heat treatment.
• Alloys 316 and 317L stainless steel tube cannot be hardened by heat treatment.

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