T20811 Special Alloy

Chemical composition%of the ladle analysis of gradeT20811

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Mo(%)V(%)
0.33~0.430.80~1.200.20~0.50≤0.030≤0.0304.75~5.501.10~1.600.30~0.60
Annealing hardness HBS: 235
Cold pull hardness HBS: 262
Preheat temperature / ℃ : 788
Quenching temperature / ℃ | salt bath furnaces: 996
Quenching temperature / ℃ | controlled atmosphere furnace: 1010
Holding time/min: 5 to 15
Quenching medium: air cold
Tempering temperature / ℃ : 552
After tempering quartile hardness HRC: 53

Mechanical properties of gradeT20811

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)
739(≥) 873(≥) 34 22 21 Solution and Aging,Annealing,Ausaging,Q+T,etc 244

Physical properties of grade T20811

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
138(≥) 354(≥) 42 13 42 Solution and Aging,Annealing,Ausaging,Q+T,etc 244
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
257 529 649

T20811 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

Equivalent Grade