Material No.: alloy 825

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

Description

EN symbol (short)NiCr21Mo
UNSN 08825
Material No.2.4858
AFNORNC 21 FeDu
BSNA 16
Registered work's labelIncoloy® 825
Density kg/dm38,1
Hardness HB135-165
CompositionNickel Chrome Molybdenum alloy
superalloy
CategoryHeat resistant steels and alloys
Structurecubic-face-centred grid
Corrosionagainst crevice corrosion
good resistance to tensile corrosion
satisfactionary against pitting corrosion
Additional characteristicsenduring in oxidating, reducing and sulfuric substances
enduring in sulfuric acid and phosphoric acid solutions
No translation!
DescriptionTitanium stabilised, fully austenitic nickel iron chrome alloy,
good resistance to crevice / tensile / pitting corrosion.

Chemical Composition

 CSiMnSCrMoNiTiFeCuALPCo
alloy 825Min %    19,502,5038,000,6022,001,50   
Max %0,050,501,000,0323,503,5046,001,20 3,000,20  
N 08825Min %    19,502,5038,000,6022,001,50   
Max %0,050,501,000,0323,503,5046,001,20 3,000,20  
ASTM B 423
2.4858Min %    19,502,5038,000,60balance1,50   
Max %0,0250,501,000,01523,503,5046,001,20balance3,000,200,021,00
(Key to Steel 2010)

Physical properties

PropertyValue
Density: kg/dm38,1
Hardness: HB135-165
Permeability at 20°C/68°F1,004
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)
2044010,811,2195 
1004622,411419014,1
300488
(0,117)		14,1
(98)		118
(710)		185
(26,8)		15,2
500540
(0,131)		16,9
(120)		124
(751)		174
(25,0)		15,7
500/932
(538/1000)		565
(0,137		18,3
(131)		126
(761)		168
(23,8)		15,8
(8,8)
700/1292
(760/1400)		615
(0,153)		21
(155)		127
(765)		154
(21,2)		16,7
(9,5)
900/1652)
982(1800)		680
(0,167)		25,7
(192)		129
(782)		130
(17,3)		17,6
(9,9)
1000/183271028,113011917,9

Mechanical properties (20°C / 68°F)

Yield strength>=235
Yield strength265
Tensile strength100
Ultimate strain45
Impact energy ISO-V
>=150
>= 100
(average value of 3 samples) 
Remarks 

Temparature information

Application area
Operation temperature-321 ºF  to 1022 ºF 
Soft annealing
Working temperature1688 ºF  to 1796 ºF 
Explanation reportcooling by water
Processing informationspreferably 1700°F
Solution heat treatment
Working temperature2102 ºF  to 1652 ºF quick cooling air/water
Explanation reportwhen reaching 1652°F re-heating is required
Processing informationsheat oven to must value and insert component
hold for approx. 60 min per 4" thickness

Standards / information

StandardsDesciption
ASTM B 163Standard Specifications for seamless nickel and nickel alloy condensers and heat-exchanger tubes
ASTM B 704Standard Specification for Welded Alloy Tubes
ASTM B 705Standard Specification for Nickel-Alloy Welded Pipe
DIN 17744 (2002/09)nickel-forgeable alloy with molybdenum and chrome
VdTÜV / Werkstoffblatt 432/1extremely corrosion resistant nickel based alloy, niCr21Mo, material-nr. 2.4858 ribbon, sheet metal
VdTÜV / Werkstoffblatt 432/2432/2 extremely corrosion resistant nickel based alloy, NiCr 21 Mo, material-nr. 2.4858 seamless pipe
VdTÜV / Werkstoffblatt 432/3extremely corrosion resistant nickel based alloy, NiCr 21 Mo, material-nr. 2.3858 rod steel, forging

Process information

Cold formingstring cold work hardening, process component in annealed state,
forming >15% require anew annealing
Chip removing processprocess when annealed - mind tendency for cold work hardeneing
Welding
 - Material classification acc. CEN ISO/TR 1560845
 - TypeWIG
plasma welding
MIG/MAG
 - Add. materialmaterial nr. 2831/ rod electrode W.Nr. 2621
 - HintsNo translation!

Main fields of application

Details of applicationgood resistance to sulfuric, hydrochloric, phosphoric acids and organic acids, seawater and chloride lye
Certificationspressure container from 68°F-797°F
NACE MR-01-75
Chemical IndustrySchwefel-und Phosphorsäureanlagen
OffshoreRohrleitungen
DruckbehälterDruckbehälter bis 450°C
sea and lake water plantsSea-water-cooled heat exchangers
Chemische Industriezur Verarbeitung von Phosporsäure
offshore plantsMeerwasserentsalzungsanlagen

Range of products

Product typeProduct
Plates / Sheetsplates/sheets
plate/sheet cuts
Rotating componentsfittings from barsteel
Fittingswelded elbows
welded reductions
Welded T-pieces
seamless elbows
seamless reductions
seamless T-pieces
Flanges / Collars / Flared tube endsflared tube end
collars
various flanges (weld neck flange,blind flange etc.)
Pipes / Tubeswelded pipes/tubes
welded square pipes/tubes
seamless pipes/tubes
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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