ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel plate designed for high-temperature pressure vessels and boilers, offering superior strength (75-100 ksi tensile, 45 ksi min yield) and excellent resistance to creep, oxidation, and corrosion, making it ideal for oil, gas, and chemical applications requiring robust performance under severe conditions.
Chemical Requirements
| Carbon (C) | % |
| Heat Analysis: Product Analysis: |
0.05 - 0.15 0.04 - 0.15 |
| Manganese (Mn) | % |
| Heat Analysis: Product Analysis: |
0.30 - 0.60 0.25 - 0.66 |
| Phosphorus (P) | % |
| Heat Analysis: Product Analysis: |
0.035 0.035 |
| Sulphur (S) (Max) | % |
| Heat Analysis: Product Analysis: |
0.035 0.035 |
| Silicon (Si) | % |
| Heat Analysis: Product Analysis: |
0.50 max 0.50 max |
| Chromium (Cr) | % |
| Heat Analysis: Product Analysis: |
2.00 - 2.50 1.88 - 2.62 |
| Molybdenum (Mo) | % |
| Heat Analysis: Product Analysis: |
0.90 - 1.10 0.85 - 1.15 |
Mechanical Property
|
Grade |
A387 Gr.22 CL.2 Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
A387 Gr.22 Cl.2 |
mm |
Min Mpa |
Mpa |
Min % |
|
t≦50 |
310 |
515-690 |
18 |
|
|
50<t≦200 |
- |
- |
- |
|
applications
Oil and Gas Industry
Refining equipment: It is widely used to make core parts like hydrotreating reactors and desulfurization units in refineries. These components can withstand the corrosion of hydrogen sulfide when processing sour crude oil and maintain stability under high pressure. It also serves in crude oil distillation equipment such as gas storage tanks and pressure - bearing pipelines.
Natural gas processing and storage: It is suitable for sour gas treatment equipment during natural gas extraction. Besides, it can be used to manufacture storage tanks for oil and gas. These tanks need to cope with the corrosion of corrosive gases in the process of oil and gas storage and ensure the safe storage of oil and gas resources.
Petrochemical and Coal Chemical Industry
Petrochemical reactors: It is utilized to produce reactors for polymerization, alkylation and other chemical reactions. These reactors often operate in harsh environments with high temperature, high pressure and corrosive media, and the material's performance can meet the operational requirements of the reactors.
Coal chemical core equipment: In coal - to - syngas and coal - to - methanol production processes, it is used to make shells of gasifiers and methanol synthesis towers. These devices face high temperatures of 400 - 550°C, high pressure, as well as erosion from complex media such as H₂ and CO, and this steel plate can maintain structural stability in such environments.
Power Generation Industry
Thermal power plants: It is a key material for thermal power boiler components, including boiler drums, headers and high - temperature steam transmission pipelines, which need to bear temperatures above 500°C and drastic pressure changes. Also, it can be used for turbine casings in combined - cycle power plants.
Nuclear power plants: It is applied to pressure vessel components in the medium - temperature section of nuclear power plants, such as the pressure - bearing structures related to heat exchange in the auxiliary systems of nuclear reactors. Its stable mechanical properties can reduce the risk of equipment failure.
General Boiler and Heat Exchanger Field
It is used to make pressure - bearing components for various industrial boilers, which can resist thermal fatigue and corrosion caused by long - term high - temperature combustion.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
What type of steel is ASTM A387 Grade 22 Class 2, and what are its core alloying components?
ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy heat-resistant steel plate, belonging to the category of low-alloy high-strength steel. Its core alloying components include approximately 2.25% chromium (Cr) and 1.0% molybdenum (Mo), supplemented by basic elements such as carbon, manganese, and silicon. The alloy ratio endows it with excellent high-temperature mechanical properties and corrosion resistance.
What is the core difference between ASTM A387 Grade 22 Class 2 and Class 1?
The core difference between the two lies in mechanical property requirements and heat treatment processes. Class 2 requires higher tensile strength, yield strength, and impact toughness, and is usually subjected to normalizing + tempering heat treatment to ensure the structural stability of the material under high temperature and pressure conditions. In contrast, Class 1 has relatively lower mechanical property indicators, and its heat treatment process can be adjusted according to actual needs, with application scenarios that are less severe than those of Class 2.