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ISO X6CrNi25 21 Application:ISO standard Austenite size heat resistant steel
Category Type Steel grade Standard Country
Grades Special Alloy ISO X6CrNi25 21 ISO ISO

Chemical composition % of the ladle analysis of grade ISO X6CrNi25 21

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%)
Max 0.08 Max 1.5 Max 2.0 Max 0.045 Max 0.030 24.0-26.0 19.0-22.0
ISO standard  Austenite size heat resistant steel
Mechanical properties of grade ISO X6CrNi25 21
Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
545 (≥) 447 (≥) 41 14 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 332
Physical properties of grade ISO X6CrNi25 21
Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
796 (≥) 117 (≥) 13 41 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 443
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
229 585 789
ISO X6CrNi25 21 Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
X6CrNi25-21 ISO ISO
Steel forgings and rolled or forged bars for pressure purposes - Technical delivery conditions - Part 5: Stainless steels

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