ASTM A387 steel sheet is a chromium–molybdenum alloy steel plate specifically designed for high-temperature and high-pressure service. It is widely used in pressure vessels, boilers, and heat-resistant equipment where elevated temperature strength, creep resistance, and corrosion resistance are critical.
With the addition of chromium for oxidation resistance and molybdenum for enhanced strength and creep performance, ASTM A387 steel sheets maintain stable mechanical properties under severe operating conditions. As a result, they are commonly specified in energy, petrochemical, and process industries that require long-term reliability and compliance with international pressure vessel standards.
Applications of ASTM A387 Steel Sheet
ASTM A387 steel sheets are extensively used in industries requiring resistance to heat, pressure, and corrosive media, particularly in demanding process environments.
Offshore Oil and Gas Drilling
Used in pressure-containing components and heat-resistant structures exposed to high temperatures and corrosive offshore conditions.
Power Generation Industry
Applied in boilers, pressure vessels, and heat recovery systems operating under elevated temperature and pressure.
Petrochemical Processing
Suitable for reactors, separators, and pressure vessels handling high-temperature hydrocarbons and aggressive process fluids.
Gas Processing Facilities
Used in equipment exposed to thermal cycling, high-pressure gas streams, and corrosive environments.
Specialty and Fine Chemicals
Selected for chemical reactors and vessels requiring consistent performance at high temperatures.
Pharmaceutical Manufacturing
Employed in process equipment where controlled temperature resistance and material stability are essential.
Pharmaceutical Equipment
Used in pressure-rated vessels and heat transfer components within regulated production environments.
Chemical Processing Equipment
Common in pressure vessels, columns, and piping systems designed for high-temperature chemical service.
Seawater and Marine Equipment
Applied in heat-resistant components where both thermal stability and corrosion resistance are required.
Heat Exchangers
Widely used for shells, channels, and tube sheets operating under high thermal stress.
Condensers
Suitable for condenser shells and pressure parts exposed to high temperatures and cyclic loading.
Pulp and Paper Industry
Used in digesters, recovery boilers, and high-temperature process equipment.
ASTM A387 Steel Sheet Chemical Composition
|
|
C
|
Mn
|
P
|
S
|
SI
|
Cr
|
Mo
|
|
Grade 5
|
0.15 max
|
0.3 – 0.6
|
0.035
|
0.03
|
0.5 max
|
4.00 – 6.00
|
0.45 – 0.65
|
|
Grade 9
|
0.15 max
|
0.30 – 0.6
|
0.03
|
0.03
|
1.0 max
|
8.0 – 10.0
|
0.9 – 1.1
|
|
Grade 11
|
0.05 – 0.17
|
0.4 – 0.65
|
0.035
|
0.035
|
0.5 – 0.80
|
1.0 – 1.5
|
0.45 – 0.65
|
|
Grade 12
|
0.05 – 0.17
|
0.4 – 0.65
|
0.035
|
0.035
|
0.15 – 0.4
|
0.8 – 1.15
|
0.45 – 0.6
|
|
Grade 22
|
0.05 – 0.15
|
0.3 – 0.6
|
0.035
|
0.035
|
0.5 max
|
2.0 – 2.5
|
0.9 – 1.1
|
Mechanical Properties of ASTM A387 Steel Sheet
|
|
Tensile Strength
(ksi)
|
Tensile Strength
(MPa)
|
Yield Strength
(ksi)
|
Yield Strength (MPa)
|
Elongation
in 2 inches (%)
|
|
A 387 Grade 5
|
Class 1
|
60-85
|
415-585
|
30
|
205
|
18
|
|
Class 2
|
75-100
|
515-690
|
45
|
310
|
18
|
|
A 387 Grade 9
|
Class 1
|
60-85
|
415-585
|
30
|
205
|
18
|
|
Class 2
|
75-100
|
515-690
|
45
|
310
|
18
|
|
A 387 Grade 11
|
Class 1
|
60-85
|
415-585
|
35
|
240
|
22
|
|
Class 2
|
70-90
|
485-620
|
45
|
310
|
22
|
|
A 387 Grade 12
|
Class 1
|
50-80
|
380-550
|
33
|
230
|
22
|
|
Class 2
|
65-85
|
450-585
|
40
|
275
|
22
|
|
A 387 Grade 22
|
Class 1
|
60-85
|
415-585
|
30
|
205
|
18
|
|
Class 2
|
75-100
|
515-690
|
45
|
310
|
18
|
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