Material No.: 1.4439

DescriptionChemical
composition		Physical
mechanical
properties		Temparature
information		StandardsProcess
information		Application
Certification		ProductsAll

Description

EN symbol (short)X2CrNiMoN17-13-5
AlloyAlloy 317 LN
UNSS 31726
Grade TP 317 LN
AFNORX2CrNiMoN17-13-5 / NF E.N 10088-1(06-2005) (FR)
BSX2CrNiMoN17-13-5 / B.S. E.N 10088-1(06-2005) (GB)
Density kg/dm38,1
Hardness HB (<=35mm)
Rockwell Hardness Number max.		<=350
B90 (S 31726-ASTM A 249)
Compositionchromium nickel molybdenium steels
CategoryCorrosion resisting steels and alloys
Structureaustenitic
Corrosionresistant to intercrystalline corrosion < 400°C
non-corroding
Additional characteristicschemically resistant

Chemical Composition

 CSiMnPSCrMoNiCuN
1.4439Min %     16,504,0012,50 0,12
Max %0.031,002,000,0450,01518,505,0014,50 0,22
(Key to steel 2010)
Alloy 317 LN
S 31726		Min %     17,004,0013,50 0,10
Max %0,031,002,000,0400,03020,005,0017,500,750,20
ASTM A 312 (S 31726)

Physical properties

PropertyValue
Density: kg/dm38,1
Hardness: HB (<=35mm)
Rockwell Hardness Number max.		<=350
B90 (S 31726-ASTM A 249)
magnetizableno
polishablegood
Temperature T
°C/F
(°C/F)		Specific heat
J / kgK
(Btu / lb °F)		Thermal conductivity
W/mK
(Btu·in / ft2·h·°F)		Electric resistance
µΩ · cm
(Ω circ mill / ft)		Modulus of elasticity
kN/mm2
(103 ksi)		Expansion rate from 70°F bis T
10-6 / K
(10-6 / °F)
20 / 680,50 (--)  200 (--)16,5 (--)
100 / 212    17,5 (--)
200 / 392    17,5 (--)
300 / 572    18,5 (--)
400 / 752    18,5 (--)
500 / 932     
Temperature1%Yield strength
in high temperatures		Tensile strenght

in high temperatures
°C / °FRp 1,0Rm
N/mm2 / ksiN/mm2 /ksi
100 / 212255 / 37,00520 / 75,40
200 / 392210 / 30,45460 / 66,70
300 / 572190 / 27,55440 / 63,80
400 / 752175 / 25,40 
ksi value calculated

Mechanical properties (20°C / 68°F)

0,2% Yield strength Rp 0,2 (N/mm2)/(ksi)

Yield strength (ksi) /( Mpa)		>285 />41,3



35/ 250



S 31726-(ASTM A 249)
1%Yield strength Rp 1,0(N/mm2) / (ksi)>315 /> 45,7
Tensile strength Rm (N/mm2) /(ksi)
Tensile strength ksi (Mpa)		580-800 / 72,5-116
80 / (550)
S 31726-(ASTM A 249)
Elongation A5 (%)
Elongation min.%		<=20
35		<=35mm-lengthwise
S 31726-(ASTM A 249)
impact work ISO-V (J)>85
E-Modul (Mpa)200 000

Temparature information

Application area
Operation temperature-454 ºF  to 752 ºF temperature limit
Explanation report-454°F only in strain situation III
Solution heat treatment
Working temperature1940 ºF  to 2084 ºF 
Processing informationscool down:water/air
Working temperature1760 ºF  to 1904 ºF 
Explanation report>= 30 min.
Processing informationscool down:air
Solution heat treatment
Working temperature1562 ºF  to 2066 ºF 
Processing informationscool down:water/air

Standards / information

StandardsDesciption
ASTM A 182Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges,Forged Fittings and Valves and Parts for High-Temperature Service
ASTM A 213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler,Superheater,and Heat-Exchanger Tubes
ASTM A 249 Standard Specification for Welded austenitic steel boiler, Superheaters, heat-exchangers,and condenser Tubes
ASTM A 269Standard Specification for Seamless and welded, austenic, and stainless steel tubing for general purposes
ASTM A 312 Standard Specification for Seamless and welded austenitic stainless steel pipes
ASTM A 403 Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
ASTM A 479Rods and cross-sections made of stainless and heat-resistant steel used in boilers and other pressure tanks
DIN EN 10088-1 (09/2005)Stainless steels Part 1: List of stainless steels
DIN EN 10088-3 (09/2005)stainless steels.Technical delivery conditions for semi-finished products,bars,rods,wire selection and bright products of corrosion resisting steels for general and construction purposes
DIN EN 10217-7Welded steel pipes under compression load Pipes made from stainless steel
DIN EN 10296-2 (02/2006)Welded circular steel pipes for machine construction and general technical service stainless steel
DIN EN 10297-2 (02/2006)Welded circular steel pipes for machine construction and general technical service stainless steel. Pipes made from stainless steel
VdTÜV- Werkstoffblatt 405Austenitic rolled and forged steel
VdTÜV-Werkstoffblatt 405austenitic rolled/forged steel, X 2 CrNiMoN 17-13-5, material nr.1.4439

Process information

Cold formingHeat treatment generally not required
Welding
 - Material classification acc. CEN ISO/TR 156088.1
 - Typewell weldable
protective gas
resistance welding
manual arc welding (E)
 - Add. material1.4440

Main fields of application

Details of applicationdurable in high chlorine concentrations and temperatures
Certifications
Chemical Industryfor processing phosphoric acid
petrochemical industry
offshore plantsSea water desalination plant
cellulose/paper industrydifferent components

Range of products

Product typeProduct
Plates / Sheetsplates/sheets
plate/sheet cuts
Fittingswelded elbows
welded reductions
Welded T-pieces
seamless elbows
seamless reductions
seamless T-pieces
Bumped boiler ends / caps / round blanksfrom bar steel
Pipes / Tubeswelded pipes/tubes
seamless pipes/tubes
Bar steelflat steel
round bar steel

Liability exclusion

All aforementioned specifications serve as a general orientation and have to be reviewed depending on the conditions of use.
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