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Description

B21 Carbon Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Carbon Steel: B21
Category Type Steel Grade Standard Country Application
Steel GradesCarbon Steel B21
A485 Grade2
A485 Grade3
A485 Grade4
52100
5195
K19526
1070M
5160
B20
20Cr3

Chemical composition(mass fraction)(wt.%) of the B21

C
Si
Mn
P
S
Cr Ni
 0.17-0.23 0.4  0.6-0.9   0.025 0.015  0.9-1.2  
Mo Al Cu Nb Ti V Ce
   0.05 0.3       
N O2 Pb B Other    
  0.002           
             

Mechanical Properties of steel grade B21

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV/Ku (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
733 (≥) 494 (≥) 22 41 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 443

Physical Properties of steel grade B21

Temperature
(°C)
Modulus of elasticity
(GPa)
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)
Specific thermal capacity
(J/kg·°C)
Specific electrical resistivity
(Ω mm²/m)
Density
(kg/dm³)
Poisson’s coefficient, ν
31 - -     0.13 -  
141 121 - 43.3 114   -  
584 - 42 32.2   132 424

Heat Treatment of steel grade B21

Heat treated : 1173°C - 1399°C

Technological Curves of steel grade B21

Cross Reference Table (Equivalent Grade) of B21

Grade Standard Country Application
Z12CKNDWNb21-20-20 AFNOR France The vent valve steel
Z12CKNDWNb21-20-20 AFNOR France Steel Exhaust Valves
Z50CMNNb21-09-02Az AFNOR France Steel Exhaust Valves
Z53CMNNb21-09-02Az AFNOR France Steel Exhaust Valves
Z60CMDVNb21-10Az AFNOR France Steel Exhaust Valves
SNB21-1-5 China China Taiwan Structural steel

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