Material No.: alloy 904 L

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

Description

EN symbol (short)X2NiCrMoCuN 25-20-5
Material No.1.4539
UNSN 08904
AFNORZ 2 NCDU 25 20
BS904S13
Density kg/dm38,05
Hardness HB<= 230
CompositionNickel Chrome Molybdenum steel
CategoryCorrosion resisting steels and alloys
Structureaustenitic
Corrosionhighly non-corrosive
Additional characteristicschemically resistant
DescriptionUsually used in highly corrosive substances.

Chemical Composition

 CMnPSCrMoSiFeNiCuN
alloy 904 LMin %    19,004,00 balance23,001,00 
Max %0,022,00,0450,03523,005,001,00balance28,002,00 
ASTM B 677 (US 08904)
1.4539Min %    19,004,00  24,001,20 
Max %0,022,000,0300,01021,005,000,70 26,002,000,150
(Key to steel 2010)
N 08904Min %    19,004,00 balance23,001,00 
Max %0,022,00,0450,03523,005,001,00balance28,002,00 
ASTM B 677 (UNS 08904 )

Physical properties

PropertyValue
Density: kg/dm38,05
Hardness: HB<= 230
Rockwell Hardness Number max.B 90 (N 08904-ASTM A 249)
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 / 68450 / (-)12 / (-)1,0 /(-)195 (-) 
100 / 212   190 (-)15,8 / (-)
200 /392   182 (-)16,1 / (-)
300 / 572   174 (-)16,5 / (-)
400 / 752   166 (-)16,9 / (-)
500 / 932   158 (-)17,3 / (-)
Temperature0,2% Yield strength in high temperatures1,0% Yield strength in high temperatures
°C /°FRp 0,2Rp 1,0
N/mm2 / ksiN/mm2 /ksi
100 / 212205 / 29,73235 /34,00
200 / 392175 / 25,38205 / 29,73
300 / 572145 /21,00175 / 25,38
400 / 752125 / 18,10165 / 23,93
500 / 932110 / 15,95140 / 20,30
ksi value calculated

Mechanical properties (20°C / 68°F)


Yield strength 0,2% offset min.N/mm2 / (ksi)

220 /31		(solution annealed)

(solution annealed)

(N 08904-ASTM A 249)
Tensile strength min (N/mm2) (ksi )
Tensile strength min.ksi (Mpa)		490 / 71
71 / (490)		(solution annealed)
(solution annealed)
(N 08904-ASTM A 249)
Elongation min.%
Elongation min.%		35
35		(solution annealed
in 2 in.or 50 mm
(solution annealed)
(N 08904-ASTM A 249)
impact work ISO-V (J)60transverse

Temparature information

Application area
Operation temperature ºF  to 662 ºF 
Working temperature1940 ºF  to 2084 ºF 
Explanation reportduration 5 min per 5 mm width
Solution heat treatment
Working temperature2102 ºF  to 1742 ºF 
Explanation reportcool down:air/Water

Standards / information

StandardsDesciption
ASTM A 249 Standard Specification for Welded austenitic steel boiler, Superheaters, heat-exchangers,and condenser Tubes
ASTM B 366Standard Specification for Factory-Made Wrought nickel and nickel alloy fittings
ASTM B 673Standard Specification for Welded Pipe
ASTM B 674Standard Specification for Welded Tube
ASTM B 677Standard Specification for UNS N08904,N08925 and N08926 Seamless Pipe and Tube

Process information

Chip removing processtendency to cold work hardening
Welding
 - Material classification acc. CEN ISO/TR 156088.2
 - Typewell weldable with all techniques
 - Add. material1.4519;2.4653
 - Hintsinterpass temperature must not go over 302°F
special post heat treating not required

Main fields of application

Details of application
Certificationsapproved for pressure containers VdTüV 421
Chemische IndustrieSchwefelsäure
Chemische IndustriePhosporsäure
Chemische IndustrieSalzsäure
ShipbuildingMeerwasserentsalzungsanlagen
Fertiliser industry

Range of products

Product typeProduct
Processing / Constructionfrom sheets
from pipes, fittings, flanges (welded)
from bar steel (turning, milling)
Plates / Sheetsplates/sheets
plate/sheet cuts
Fittingswelded reductions
Welded T-pieces
seamless elbows
seamless reductions
seamless T-pieces
Other Fittings a.o. Weldolets, Nipples
Flanges / Collars / Flared tube endsflared tube end
collars
various flanges (weld neck flange,blind flange etc.)
weld neck flange/blind flange
Bumped boiler ends / caps / round blanksfrom sheets
from bar steel
Pipes / Tubeswelded pipes/tubes
seamless pipes/tubes
Round barforged raw
Bar steelflat steel
section steel
round bar steel
hexagon 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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