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ATI Allegheny Ludlum Type 317 Stainless Steel, UNS S31700
Categories: Metal; Ferrous Metal; Stainless Steel; T 300 Series Stainless Steel

Material Notes: This is a molybdenum-bearing austenitic stainless steels which is more resistant to general corrosion and pitting/crevice corrosion than the conventional chromium-nickel austenitic stainless steels such as Type 304. These alloys also offer higher creep, stress-to-rupture and tensile strength at elevated temperature. Types 317 and 317L containing 3 to 4% molybdenum are preferred to Types 316 or 316L which contain 2 to 3% molybdenum in applications requiring enhanced pitting and general corrosion resistance. Austenitic stainless steels with higher molybdenum or molybdenum plus nitrogen content which provide even greater resistance to pitting, crevice corrosion an general corrosion are also available in flat-rolled products from Allegheny Ludlum. Properties of these alloys are described in separate technical data publications available from Allegheny Ludlum. In addition to excellent corrosion resistance and strength properties, this alloy also provides the excellent fabricability and formability. This is available in the form of sheet, strip and plate to ASTM A240 and ASME SA-240 and other pertinent specifications.

Information provided by Allegheny Ludlum

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Physical PropertiesOriginal ValueComments
Density 8.027 g/cc
 
Mechanical PropertiesOriginal ValueComments
Hardness, Brinell <= 217Annealed; Max required by ASTM A 240 and ASME SA-240
Hardness, Rockwell B <= 95Annealed; Max required by ASTM A 240 and ASME SA-240
Tensile Strength, Ultimate >= 515 MPaAnnealed; Min required by ASTM A 240 and ASME SA-240
Tensile Strength, Yield >= 205 MPa
@Strain 0.2 %
Annealed; Min required by ASTM A 240 and ASME SA-240
Elongation at Break >= 35 %
@Thickness 50.8 mm
Annealed; Min required by ASTM A 240 and ASME SA-240
Modulus of Elasticity 200 GPa
Poissons Ratio 0.30calculated
Shear Modulus 82.0 GPa
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.0000790 ohm-cm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 16.5 µm/m-°C
@Temperature 20.0 - 100 °C
 18.2 µm/m-°C
@Temperature 20.0 - 500 °C
 19.5 µm/m-°C
@Temperature 20.0 - 1000 °C
Specific Heat Capacity 0.450 J/g-°C
Thermal Conductivity 14.6 W/m-K
Melting Point 1390 - 1440 °C
Solidus 1390 °C
Liquidus 1440 °C
Maximum Service Temperature, Air 899 °CExcellent oxidation and scaling resistance to this temp.
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 0.080 %
Chromium, Cr 18 - 20 %
Iron, Fe 58 - 65 %as balance
Manganese, Mn 2.0 %
Molybdenum, Mo 3.0 - 4.0 %
Nickel, Ni 11 - 15 %
Nitrogen, N 0.10 %
Phosphorus, P 0.045 %
Silicon, Si 0.75 %
Sulfur, S 0.030 %

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