8Cr20Si2Ni Stainless Steels to GB/T 1221 (1992)

8Cr20Si2Ni - Specification & Application

  • GB/T 1221 (1992) - Heat-resisting steel bars
  • GB/T 12773 (1991) - Valve steel bars for internal combustion engines - Technical requirements

Heat-resisting steel bars

Chemical composition(wt.%) of 8Cr20Si2Ni grade: to GB/T 1221 (1992)

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.75 0.85
Si 1.75 2.25
Mn 0.20 0.60
P - 0.035
S - 0.030
Ni 1.15 1.65
Cr 19.00 20.50

8Cr20Si2Ni - Detail

8Cr20Si2Ni

Mechanical properties of grade 8Cr20Si2Ni GB/T 1221 (1992)

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)
184 (≥) 171 (≥) 31 11 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 413

Physical properties of grade 8Cr20Si2Ni GB/T 1221 (1992)

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
422 (≥) 827 (≥) 14 23 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 112
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
522 715 176

Equivalent Grade

Equivalent Products

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