X6CrNi25-21 Stainless Steels to ISO 4955 (2005)

X6CrNi25-21 - Specification & Application

  • ISO 4955 (2005) - Heat-resistant steels
  • ISO 9327-5 - Steel forgings and rolled or forged bars for pressure purposes - Technical delivery conditions - Part 5: Stainless steels

Steel forgings and rolled or forged bars for pressure purposes - Technical delivery conditions - Part 5: Stainless steels

Chemical composition(wt.%) of X6CrNi25-21 grade: to ISO 4955 (2005)

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.08
Si - 1.50
Mn - 2.00
P - 0.045
S - 0.030
Cr 24.00 26.00
Ni 19.00 22.00

X6CrNi25-21 - Detail

Steel forgings and rolled or forged bars for pressure purposes - Technical delivery conditions - Part 5: Stainless steels

Mechanical properties of grade X6CrNi25-21 ISO 4955 (2005)

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)
328 (≥) 789 (≥) 24 11 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 233

Physical properties of grade X6CrNi25-21 ISO 4955 (2005)

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
366 (≥) 798 (≥) 32 22 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 242
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
985 724 623

Equivalent Grade

Equivalent Products

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