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A 387 Grade 21

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China 鞍钢Q/ASB A387Grade21 压力容器用铬、钼合金钢板 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: A387Grade21 / A 387 Grade 21
Category Grade Standard Region/Area Standard Content
Metals A 387 Grade 21 Q/ASB 270 China 压力容器用铬、钼合金钢板

Chemical composition(mass fraction)(wt.%) of the A 387 Grade 21

Element Min Max Similar
Mo 0.8500 1.1500 -
Cr 2.6300 3.7300 -
S - 0.0250 -
P - 0.0250 -
Mn 0.2500 0.6000 -
Si - 0.5000 -
C 0.0400 0.1500 -

Mechanical Properties of steel grade A 387 Grade 21

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)
827 (≥) 761 (≥) 12 34 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 331

Physical Properties of steel grade A 387 Grade 21

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
44 - -     0.32 -  
853 365 - 24.3 121   -  
121 - 33 12.2   123 244

Heat Treatment of steel grade A 387 Grade 21

Heat treated : 1537°C - 1278°C

Technological Curves of steel grade A 387 Grade 21

Cross Reference Table (Equivalent Grade) of A 387 Grade 21

Grade Standard Country Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1
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