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Grade21

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Gr 825 Grade31
#Grade21

Description

USA ASTM Grade21 Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures and Grade21 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Special Alloy: Grade21
Category Type Steel Grade Standard Country Application
Steel GradesSpecial Alloy Grade21 ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
J02500
J03500
J02500
J03000
J03001
J03501
J02501
Gr 485
Gr 620
Gr 825

Chemical composition(mass fraction)(wt.%) of the Grade21

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Mo(％) Co(%) B(%) Fe(%)
0.20-0.30 1 1 0.04 0.04 25.0-29.0 1.75-3.75 5.0-6.0 Bal ≤0.007 ≤3.00

Mechanical Properties of steel grade Grade21

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)
581 (≥) 294 (≥) 13 21 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 421

Physical Properties of steel grade Grade21

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
21 - -     0.44 -  
926 888 - 23.3 322   -  
788 - 32 14.2   434 214

Heat Treatment of steel grade Grade21

Heat treated : 1364°C - 1216°C

Technological Curves of steel grade Grade21

Cross Reference Table (Equivalent Grade) of Grade21

Grade Standard Country Application
Grade21 AISI USA
Grade21 ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
Grade21 ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
Gr 825 Grade31
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Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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