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4Cr9Si2 Application:Chinese GB standard of internal combustion engine valve steel bar (GB/T 12773-1991)
Category Type Steel grade Standard Country
Grades Special Alloy 4Cr9Si2 GBT China

Chemical composition % of the ladle analysis of grade 4Cr9Si2

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％)
0.35-0.50 2.00-3.00 0.70 0.035 0.03 8.00-10.0 0.60
4Cr9Si2 - Chinese GB standard of internal combustion engine valve steel bar (GB/T 12773-1991)
Mechanical properties of grade 4Cr9Si2
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)
118 (≥) 365 (≥) 21 31 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 132
Physical properties of grade 4Cr9Si2
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
456 (≥) 116 (≥) 31 22 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 431
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
878 824 971
4Cr9Si2 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
4Cr9Si2 GBT China
Valve steel bars for internal combustion engines - Technical requirements

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