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JIS SNCM 21 H

Description

JIS JIS SNCM 21 H Alloy Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Alloy Steel: JIS SNCM 21 H

Chemical composition(mass fraction)(wt.%) of the JIS SNCM 21 H

Element Weight %
C 0.15-0.20
Mn 0.70-0.90
P 0.035 (max)
S 0.04 (max)
Si 0.15-0.30
Cr 0.40-0.60
Ni 0.40-0.70
Mo 0.15-0.25

Mechanical Properties of steel grade JIS SNCM 21 H

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)
113 (≥) 626 (≥) 12 42 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 141

Physical Properties of steel grade JIS SNCM 21 H

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
24 - -     0.14 -  
975 255 - 24.3 223   -  
643 - 31 11.2   342 143

Heat Treatment of steel grade JIS SNCM 21 H

Heat treated : 1386°C - 1435°C

Technological Curves of steel grade JIS SNCM 21 H

Cross Reference Table (Equivalent Grade) of JIS SNCM 21 H

Grade Standard Country Application
Q195 China Engineering and welding
Q215 China Engineering and welding
Q215 B China Engineering and welding
Q235 China Engineering and welding
Q235 B China Engineering and welding
Q235 C China Engineering and welding
Q235 D China Engineering and welding
Q255 A China Engineering and welding
Q255 B China Engineering and welding
Q275 China Engineering and welding
Q235q C China Bridge structure with steel
Q235q D China Bridge structure with steel
Q345q E China Bridge structure with steel
Q345q C China Bridge structure with steel
ASTM 1030 ASTM USA General use carbon steel bar
UNS G10300 UNS USA General use carbon steel bar
ASTM 1005 ASTM USA General use carbon steel bar
UNS G10050 UNS USA General use carbon steel bar
ASTM 1006 ASTM USA General use carbon steel bar
UNS G10060 UNS USA General use carbon steel bar

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