ASTM A387 Grade 22 Class 1 is a type of chromium-molybdenum (Cr-Mo) alloy steel plate designed for weldable boilers and pressure vessels used in elevated temperature service.
Chemical Requirements for ASTM A387 Grade 22 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| A387 Grade 22 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.15 |
| Product Analysis: | 0.04 - 0.15 | |
| Manganese: | Heat Analysis: | 0.30 - 0.60 |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.50 max | |
| Chromium: | Heat Analysis: | 2.00 - 2.50 |
| Product Analysis: | 1.88 - 2.62 | |
| Molybdenum: | Heat Analysis: | 0.90 - 1.10 |
| Product Analysis: | 0.85 - 1.15 |
Mechanical Property
|
Grade |
A387 Gr.22 CL.1 Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
A387 Gr.22 Cl.1 |
mm |
Min Mpa |
Mpa |
Min % |
|
t≦50 |
205 |
415-585 |
18 |
|
|
50<t≦200 |
- |
- |
- |
|
applications
Oil and Gas Industry
Refining equipment: It is extensively used to manufacture hydrotreating reactors and core parts of desulfurization units in refineries. When processing sour crude oil, these components can endure corrosion from hydrogen sulfide and high-pressure conditions. Also, it is applied in crude oil distillation equipment, such as gas storage vessels and pressure-bearing pipelines, which guarantees the stable operation of the refining process.
Natural gas processing and transmission: It is suitable for sour gas treatment equipment during natural gas extraction. Meanwhile, it can be used to make transmission pipelines, coping with the corrosive gases and high pressure in the natural gas transmission process, and ensuring the safe transportation of natural gas.
Petrochemical and Coal Chemical Industry
Petrochemical reactors: It is used to produce reactors for polymerization, alkylation and other chemical reaction processes. These reactors often work in high-temperature and high-pressure environments with corrosive media, and the material's corrosion resistance and high-temperature strength can meet the operational requirements.
Coal chemical core equipment: In the coal-to-syngas and coal-to-methanol processes, it is utilized to make shells of gasifiers and methanol synthesis towers. These devices face high temperatures of 400 - 550°C, high pressure, and erosion from complex media like H₂, CO, and H₂S. The material can resist corrosion and maintain structural stability, thus supporting the long-term operation of coal chemical production.
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. These parts have to bear temperatures above 500°C and drastic pressure changes, and also adapt to the frequent start-up and shutdown cycles of units. The material's resistance to thermal fatigue and creep can ensure operational safety. In addition, it is also used for components such as 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 and ensure the safe operation of nuclear power equipment.
General Boiler and Heat Exchanger FieldBeyond power and chemical-specific boilers, it is used to make pressure-bearing components for various industrial boilers. It can resist thermal fatigue and corrosion caused by long-term high-temperature combustion. Moreover, it is suitable for manufacturing tube sheets and shells of heavy-duty heat exchangers in multiple industries. These heat exchangers usually handle high-temperature and high-pressure fluids, and the material can ensure efficient heat exchange while maintaining the integrity of the equipment structure.
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What is A387 grade 22 material?
Chrome Molybdenum Steel
Chrome Molybdenum Steel – ASTM A387 Grade 22 Class 2. The A387 Grade 22 Class 2 – a grade of chromium-molybdenum alloy – is mainly intended for use in pressure vessels and welded boilers, which are designed for use in elevated temperature service.
What is the ASTM A387 equivalent to?
Among the ASTM A387 Grade 22 equivalent steel grades, SA387 Grade 22, 10CrMo9-10 is more popular than other equivalents. SA387 Grade 22 steel is under ASME SA387/ SA387M standard. The chemical performance and technical requirements of SA387 Grade 22 steel is almost same with ASTM A387 Grade 22 steel.