Overview
317L is a molybdenum bearing, low carbon content"L"grade austenitic stainless steel that provides improved corrosion resistance over 304L and 316L stainless steels. The low carbon provides resistance to sensitization during welding and other thermal processes. It is non-magnetic in the annealed condition but may become slightly magnetic as a result of welding, it has excellent corrosion resistance in a wide range of chemicals, especially in acidic chloride environments such as those encountered in pulp and paper mills. Increased levels of chromium, nickel and molybdenum compared to 316L stainless steel improve resistance to chloride pitting and general corrosion. Resistance increases with molybdenum alloy content.
317L is resistant to sulfuric acid concentrations up to 5 percent at temperatures as high as 120°F (49°C). At temperatures under 100°F (38°C) this alloy has excellent resistance to solutions of higher concentration. In processes where condensation of sulfur-bearing gases occurs, it's much more resistant to attack at the point of condensation than conventional alloy 316. The acid concentration has a marked influence on the rate of attack in such environments and should be carefully determined by service tests.
Specification
ASTM A213/A213M-21a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
| Specifications | ASTM A213 / ASME SA213 |
| Dimensions | ASTM, ASME and API |
| Range | 1/2"OD - 12"OD |
| Outside Diameter | 3.00 mm - 219.10 mm, 6.35 mm O.D to 114.3 mm O.D |
| Length | Single Random, Double Random & Required Length |
| Thickness | 0.40 mm - 12.70 mm, 0.8 mm to12.7 mm |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS |
| Type | Seamless |
| Form | Round Tube, Square Tube, Rectangular Tube |
| End | Plain End, Beveled End, Treaded |
ASTM A213 SS 317L Equivalent:
| STANDARD | WERKSTOFF NR. | UNS | JIS | AFNOR | BS | GOST | EN |
| SS 317L | 1.4438 | S31703 | – | – | – | – | – |
Chemical Composition
| Grade | C | Ni | Si | N | S | Mn | P | Cr | Mo | |
SS 317L | min. | – | 11.0 | – | – | – | – | – | 18.0 | 3.00 |
| max. | 0.03 | 15.0 | 0.75 | – | 0.03 | 2.00 | 0.040 | 20.0 | 4.00 | |
Mechanical Properties
Grade | Tensile Strength | Elongation | Yield Strength | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| SS 317L | 515 | 35 | 205 | 95 | 217 |
SS 317L Tube ASTM A213 Tolerances
| Specification | Allowable Outside Diameter Variation in mm | Allowable Wall Thickness Variation | Exact Length Tolerance in mm | Testing | ||||
| Nominal Diameter | Over | Under | %Over | %Under | Over | Under | ||
ASTM-A213 TP317L | Under 25.4 | .1016 | .1016 | +20 | -0 | 3.175 | 0 | Flattening Test |
| 25.4-38.1 incl | .1524 | .1524 | +22 | -0 | 3.175 | 0 | Tension Test | |
| 38.1-50.8 excl | .2032 | .2032 | +22 | -0 | 3.176 | 0 | Flare Test | |
| 50.8-63.5 excl | .254 | .254 | +2 | -0 | 4.46 | 0 | Hardness Test | |
| 63.5-76.2 excl | .317L8 | .317L8 | +22 | -0 | 4.76 | 0 | 100% Hydrostatic test | |
| 76.2-101.6 incl | .381 | .381 | +22 | -0 | 4.76 | 0 | Refer to ASTM A-450 | |
Applications
- 1. Flue-gas desulfurization systems
- 2. Chemical process vessels
- 3. Petrochemical
- 4. Pulp and Paper
- 5. Condensers in power generation
