ASTM A387 Boiler Vessels are chromium molybdenum alloy steel coils, suitable for welding boilers and for high temperature pressure vessels. ASTM A387 boiler vessel coils are classified into grade 5, grade 9, grade 11, grade 12, grade 22 and grade 91 according to the alloy elements contained. Except for grades 21L, 22L, 91 and 911, each grade of ASTM A387 boiler vessel coil has two tensile strength categories according to its heat treatment: Class 1 and Class 2.
Rolling, Annealing, Quenching, Tempered or Standard
Surface Process
Ordinary, Wire Drawing, Laminated Film
Chemical Composition
A387
UNS
C
Mn
P
S
Si
Cr
Mo
Level 5
S50200
≤ 0.15
0.25-0.66
0.025
0.025
≤ 0.55
3.90-6.10
0.40-0.70
Level 9
K90941
≤ 0.15
0.25-0.66
0.025
0.025
≤ 1.05
7.90-10.10
0.85-1.15
Level 11
K11789
0.04-0.17
0.35-0.73
0.025
0.025
0.44-0.86
0.94-1.56
0.40-0.70
Level 12
K11757
0.04-0.17
0.35-0.73
0.025
0.025
0.13-0.45
0.74-1.21
0.40-0.65
Level 22
K21590
0.04-0.15
0.25-0.66
0.025
0.025
≤ 0.50
1.88-2.62
0.85-1.15
Class 22L
K21590
≤ 0.12
0.25-0.66
0.025
0.025
≤ 0.50
1.88-2.62
0.85-1.15
Class 91
K90901
0.06-0.15
0.25-0.66
0.025
0.012
0.18-0.56
7.90-9.60
0.80-1.10
Mechanical Properties
A387
Category
Tensile Strength Mpa
Yield Strength Mpa
Elongation Gauge Length 2in.[50mm]%
Level 5
Section Category 1
415-585
205
18
Section Category 2
515-690
310
18
Level 9
Section Category 1
415-585
205
18
Section Category 2
515-690
310
18
Level 11
Section Category 1
415-585
240
22
Section Category 2
485-620
310
22
Level 12
Section Category 1
380-550
230
22
Section Category 2
450-585
275
22
Level 22
Section Category 1
415-585
205
18
Section Category 2
515-690
310
18
Physical Performance
Physical Performance
Metric
Imperial
Density
7.7-8.03 g/cm3
7.7-8.03 g/cm3
Scope of Application
The molybdenum composition in ASTM A387 boiler vessel plate can improve its tensile strength at high temperature, and make it have higher oxidation and corrosion resistance by increasing the lattice strain. ASTM A387 Boiler Container Plates are ideal for use in heat-resistant pressure vessels and sour gas environments.
Equivalent Material
American Standard ASTM
European Standard ASME
German Standard EN 10028
English standard DIN
Legal standard BS
Russian standard AFNOR 36206
A387 5
SA387 5
X12CrMo5
-
-
-
A387 9
SA387 9
-
-
-
-
A387 11
SA387 11
13CrMoSi5-5
-
621B
-
A387 12
SA387 12
13CrMo4-5
13CrMo44
620B
15CD2.05
A387 22
SA387 22
10/11CrMo9-10
10CrMo9-10
622-515B
12CD9-10
A387 91
SA387 91
10CrMoVNb9-1
-
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Mark Doe
Galvanized coils are our top choice for durability and
consistency.
The zinc layer
uniformity saves us time in post-processing, and your team's technical
support is
always
helpful.
Mahan Selon
We have been purchasing yulun galvanized steel coils for
the quality
has
consistently exceeded our expectations. The coating uniformity, corrosion
resistance, and
surface finish meet our strict standards, making them ideal for
construction.