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GB 4Cr9Si2 Details

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4Cr9Si2 Application:Valve steel bars for internal combustion engines - Technical requirements

Category Type Grade Microstructure Designations
Grades Stainless Steels 4Cr9Si2 Martensite China - GB , 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

Chemical composition(wt.%) of 4Cr9Si2 grade: 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

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)
319 (≥) 479 (≥) 14 14 22 Solution and Aging, Annealing, Ausaging, Q+T,etc 112

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
598 (≥) 119 (≥) 13 43 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 344
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
772 735 336

4Cr9Si2 - Form of Supply

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
4Cr9Si2 GB China
Valve steel bars for internal combustion engines - Technical requirements

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