ASTM A387 Grade 22 Class 2 is a specific grade of chromium-molybdenum (Cr-Mo) alloy steel plate, which is covered by the ASTM A387 specification for alloy steel plates intended for welded boilers and pressure vessels in elevated temperature service. It is a low-alloy high-strength steel with nominal 2.25% chromium and 1.0% molybdenum as core alloying elements, supplemented by controlled amounts of carbon, manganese, silicon, and other basic elements. Characterized by excellent high-temperature creep resistance, oxidation resistance, thermal stability, and corrosion resistance to reducing media like hydrogen and hydrogen sulfide, it is typically subjected to normalizing + tempering heat treatment to achieve superior mechanical properties. This grade is widely used in high-temperature and high-pressure industries such as oil and gas, petrochemical, coal chemical, and power generation, mainly for manufacturing pressure vessels, boilers, heat exchangers, and other key components.
Chemical Composition
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A387 Gr.22 CL.2 Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
Cr |
Mo |
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A387 Gr.22 Cl.2 |
0.04-0.15 |
0.50 |
0.30-0.60 |
0.035 |
0.035 |
1.88-2.62 |
0.85-1.15 |
Mechanical Property
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Grade |
A387 Gr.22 CL.2 Mechanical Property |
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Thickness |
Yield |
Tensile |
Elongation |
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A387 Gr.22 Cl.2 |
mm |
Min Mpa |
Mpa |
Min % |
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t≦50 |
310 |
515-690 |
18 |
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50<t≦200 |
- |
- |
- |
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Key Applications
Pressure Vessels & Boilers: Its main purpose is in welded vessels and boilers operating at elevated temperatures, resisting creep and thermal stress.
Oil & Gas Industry: Used for storage tanks, pipelines (onshore/offshore), process vessels, and condensers handling hot liquids, steam, hydrocarbons, and sour (sulfide-containing) gas.
Chemical Processing: Ideal for components in chemical plants where high temperatures and corrosive substances are present, including heat exchangers and reactors.
Power Generation: Utilized in power plants for equipment requiring high-temperature strength and reliability, such as steam systems.
High-Temperature Ducting & Piping: Suitable for transporting hot fluids and gases in various industrial settings.
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What corrosion resistance does ASTM A387 Grade 22 Class 2 possess, and which corrosive medium environments is it suitable for?
This material has good corrosion resistance to reducing media such as hydrogen, hydrogen sulfide (H₂S), and carbon monoxide (CO). It can also resist high-temperature oxidation and mild acid-base corrosion. It is particularly suitable for sour crude oil processing, natural gas treatment, and other working conditions involving corrosive gases.
How does ASTM A387 Grade 22 Class 2 perform in terms of high-temperature resistance, and what is its applicable temperature range?
This material exhibits excellent high-temperature creep resistance, oxidation resistance, and thermal stability. It can maintain good mechanical properties in long-term high-temperature environments without easy deformation or fracture. Its conventional applicable temperature range is -29°C to 593°C, and it can serve stably in high-temperature equipment in industries such as petrochemicals and electric power.