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NBR 7837 Class Ⅱ A

Brazil NBR NBR7837ClassⅡA Cast iron parts for use in temperatures above 760℃ and Mechanical Properties, Chemical Element, Cross Reference.

Category Grade Standard Region/Area Standard Content
Metals NBR 7837 Class Ⅱ A ABNT NBR 7837 Brazil Cast iron parts for use in temperatures above 760℃

Chemical composition(mass fraction)(wt.%) of the NBR 7837 Class Ⅱ A

Element Min Max Similar
C 1.6000 2.5000 -
Mn 0.4000 0.8000 -
P - - 0.2000
S - - 0.1500
Si 4.0000 6.0000 -

Mechanical Properties of steel grade NBR 7837 Class Ⅱ A

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)
934 (≥) 827 (≥) 12 42 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 444

Physical Properties of steel grade NBR 7837 Class Ⅱ A

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
23 - -     0.34 -  
744 737 - 22.3 243   -  
448 - 43 21.2   423 223

Heat Treatment of steel grade NBR 7837 Class Ⅱ A

Heat treated : 1865°C - 1136°C

Technological Curves of steel grade NBR 7837 Class Ⅱ A

Cross Reference Table (Equivalent Grade) of NBR 7837 Class Ⅱ A

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