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A387 Grade 991 Class 2

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America ASTM A387Grade991Class2 压力容器用铬钼合金钢板的标准规范 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: A387Grade991Class2 / A387 Grade 991 Class 2
Category Grade Standard Region/Area Standard Content
Metals A387 Grade 991 Class 2 ASTM A387/A387M America 压力容器用铬钼合金钢板的标准规范

Chemical composition(mass fraction)(wt.%) of the A387 Grade 991 Class 2

Element Min Max Similar
W 0.9000 1.1000 -
N 0.0400 0.0900 -
B 0.0003 0.0060 -
Al - 0.0400 -
Nb 0.0600 0.1000 -
V 0.1800 0.2500 -
Mo 0.9000 1.1000 -
Ni - 0.4000 -
Cr 8.5000 10.5000 -
P - 0.0200 -
S - 0.0100 -
Mn 0.3000 0.6000 -
Si 0.1000 0.5000 -
C 0.0900 0.1300 -

Mechanical Properties of steel grade A387 Grade 991 Class 2

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)
986 (≥) 588 (≥) 24 24 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 412

Physical Properties of steel grade A387 Grade 991 Class 2

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
43 - -     0.22 -  
117 688 - 11.3 212   -  
728 - 23 13.2   341 134

Heat Treatment of steel grade A387 Grade 991 Class 2

Heat treated : 1463°C - 1899°C

Technological Curves of steel grade A387 Grade 991 Class 2

Cross Reference Table (Equivalent Grade) of A387 Grade 991 Class 2

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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