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8Cr20Si2NiApplication:Chinese GB standard of internal combustion engine valve steel bar (GB/T 12773-1991)
CategoryTypeSteel gradeStandardCountry
Grades Special Alloy 8Cr20Si2NiGBTChina

Chemical composition%of the ladle analysis of grade8Cr20Si2Ni

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Ni(%)
0.75-0.851.75-2.250.20-0.600.030.0319.0-20.51.15-1.65
8Cr20Si2Ni - Chinese GB standard of internal combustion engine valve steel bar (GB/T 12773-1991)
Mechanical properties of grade8Cr20Si2Ni
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 ConditionBrinell hardness(HBW)
879(≥)221(≥)241322Solution and Aging,Annealing,Ausaging,Q+T,etc224
Physical properties of grade8Cr20Si2Ni
PropertyDensity
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
615(≥)217(≥)333133Solution and Aging,Annealing,Ausaging,Q+T,etc434
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
425613865
8Cr20Si2NiRange of products
Product typeProductsDimensionProcessesDeliver Status
Plates/SheetsPlates/Sheets0.08-200mm(T)*W*LForging,hot rolling and cold rollingAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel BarRound Bar,Flat Bar,Square BarΦ8-1200mm*LForging,hot rolling and cold rolling,CastBlack,Rough Turning,Shot Blasting,
Coil/StripSteel Coil/Steel Strip0.03-16.0x1200mmCold-Rolled&Hot-RolledAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/TubesSeamless Pipes/Tubes,Welded Pipes/TubesOD:6-219mm x WT:0.5-20.0mmHot extrusion,Cold Drawn,WeldedAnnealed,Solution and Aging,Q+T,ACID-WASHED
Cross Reference Table(Equivalent Grade)
GradeStandardCountryApplication
8Cr20Si2NiGBTChina
Heat-resisting steel bars

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