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8Cr20Si2Ni Application:Chinese GB standard of internal combustion engine valve steel bar (GB/T 12773-1991)
Category Type Steel grade Standard Country
Grades Special Alloy 8Cr20Si2Ni GBT China

Chemical composition % of the ladle analysis of grade 8Cr20Si2Ni

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％)
0.75-0.85 1.75-2.25 0.20-0.60 0.03 0.03 19.0-20.5 1.15-1.65
8Cr20Si2Ni - Chinese GB standard of internal combustion engine valve steel bar (GB/T 12773-1991)
Mechanical properties of grade 8Cr20Si2Ni
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)
162 (≥) 436 (≥) 11 32 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 112
Physical properties of grade 8Cr20Si2Ni
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
347 (≥) 291 (≥) 43 32 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 142
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
417 336 438
8Cr20Si2Ni 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
8Cr20Si2Ni GBT China
Heat-resisting steel bars

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