4Cr9Si2

4Cr9Si2 Stainless Steels to GB/T 1221 (1992)

4Cr9Si2 - Specification & Application

  • GB/T 1221 (1992) - Heat-resisting steel bars
  • GB/T 12773 (1991) - Valve steel bars for internal combustion engines - Technical requirements
  • JB/T 6398 (2006) - Heavy stainless acid resistant and heat resistant steel forgings

Valve steel bars for internal combustion engines - Technical requirements

Chemical composition(wt.%) of 4Cr9Si2 grade: to GB/T 1221 (1992)

Elements Min.（≥） Max.（≤） Similar Remarks
C 0.35 0.50
Si 2.00 3.00
Mn - 0.70
P - 0.035
S - 0.030
Ni - 0.60
Cr 8.00 10.00

4Cr9Si2 - Detail

4Cr9Si2

Mechanical properties of grade 4Cr9Si2 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)
425 (≥) 826 (≥) 34 34 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 123

Physical properties of grade 4Cr9Si2 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
914 (≥) 448 (≥) 33 14 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 221
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
954 152 124

Equivalent Grade

1 4Cr9Si2 2 4Cr9Si2

Equivalent Products

Product shapes we supply:

We can customize the production of 4Cr9Si2 grade, contact us for the best solution.
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