USA UNS
K90901
ASTM
Specification or Grade
F 91
Corresponding Standard
ASTM A182/A182M-2018
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
Classification
Alloy Steel
Properties
Corrosion Resistance
Chemical Element Composition Content (%)
Component
C
Si
Mn
P
S
Cr
Ni
Mo
N
Ti
V
Nb
Zr
Al
Type 1
Minimum Value
0.08
0.2
0.3
-
-
8
-
0.85
0.03
-
0.18
0.06
-
-
Maximum Value
0.12
0.5
0.6
0.02
0.01
9.5
0.4
1.05
0.07
0.01
0.25
0.1
0.01
0.02
Component
C
Si
Mn
P
S
Cr
Ni
Cu
Mo
As
N
Ti
W
V
Nb
Zr
B
Al
Sn
Sb
Type 2
Minimum Value
0.08
0.2
0.3
-
-
8
-
-
0.85
-
0.035
-
-
0.18
0.06
-
-
-
-
-
Maximum Value
0.12
0.4
0.5
0.02
0.005
9.5
0.2
0.1
1.05
0.01
0.07
0.01
0.05
0.25
0.1
0.01
0.001
0.02
0.01
0.003
Component
C
Si
Mn
P
S
Cr
Ni
Cu
Mo
As
N
Ti
W
V
Nb
Zr
B
Al
Sn
Sb
Product*
Minimum Value
0.07
0.2
0.3
-
-
8
-
-
0.8
-
0.035
-
-
0.16
0.05
-
-
-
-
-
Maximum Value
0.13
0.4
0.5
0.02
0.005
9.5
0.2
0.1
1.05
0.01
0.07
0.01
0.05
0.27
0.11
0.01
0.001
0.02
0.01
0.003
Mechanical Properties
Tensile Strength σb
Mpa
Specified Plastic Yield Strength Rp0.2
Mpa
Elongation or Extension Rate δ
%
Reduction of Area ψ
%
Hardness
HBW
≥620
≥415
≥20
≥40
190~248
Message
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