A387 Grade 5 Class 2 is high quality chrome molybdenum alloy steel plate intended specifically for usein weldable carbon steel pressure vessels at elevated temperatures. Added molybdenum gives the material greater temperaturetensile strength and the chromium provides improved corrosion resistance.
Chemical Requirements for ASTM A387 Grade 5 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| A 387 Grade 5 | ||
| Carbon: | Heat Analysis: | 0.15 max |
| Product Analysis: | 0.15 max | |
| 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: | 0.030 |
| Product Analysis: | 0.030 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.55 max | |
| Chromium: | Heat Analysis: | 4.00 - 6.00 |
| Product Analysis: | 3.90 - 6.10 | |
| Molybdenum: | Heat Analysis: | 0.45 - 0.65 |
| Product Analysis: | 0.40 - 0.70 |
Mechanical Property
|
Grade |
A387 Gr.5 CL.2 Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
A387 Gr.5 Cl.2 |
mm |
Min Mpa |
Mpa |
Min % |
|
t≦50 |
310 |
515-690 |
18 |
|
|
50 |
- |
- |
- |
|
applications
1. Pressure Vessels & Boilers
Boiler Components: Primarily used for steam drums, tubes, and headers in fossil fuel and nuclear power plants. Its resistance to thermal fatigue and oxidation allows boilers to operate at temperatures up to 1000°F (538°C) for extended periods with minimal maintenance.
Fabricated Vessels: Ideal for the construction of large-scale welded pressure vessels. The molybdenum content provides high creep strength, ensuring the vessels can withstand pressures up to 2,175 psi without structural warping or cracking.
2. Chemical Processing
Acid Handling: Specifically suited for equipment processing anhydrous sulfuric acid and citric acid solutions. It maintains structural integrity at concentrations up to 85% at temperatures as high as 650°F (343°C).
Harsh Environments: Used in chemical reactors where resistance to oxidation and high-pressure chemical reactions is required to prevent equipment failure and ensure long-term safety.
3. Oil & Gas Industry
Sour Service: The high chromium content provides essential protection against corrosion from hydrogen sulfide (
H2Scap H sub 2 cap S
𝐻2𝑆) and other acidic compounds found in "sour" oil and gas fields.
Infrastructure: Commonly used in high-pressure piping systems, flanges, and pipe clamps that transfer hot liquids and gases between different processing modules.
4. Power Generation
Heat Management: Fabricated into heat exchangers and condensers where efficient thermal transfer is required under high-pressure steam conditions.
Advanced Systems: Employed in specialized equipment for hydropower stations, nuclear reactor pressure vessels, and high-temperature ducting for exhaust systems.
5. Petrochemical Plants
Reactor Vessels: Critical for chemical reactors that initiate and accelerate reactions under severe environmental conditions. It prevents high-temperature corrosion that would otherwise shorten equipment life.
Processing Equipment: Used in separators, spherical storage tanks, and equipment for liquefied gas storage where the material must resist both thermal stress and environmental degradation.
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 is ASTM A387 GRADE 5 CLASS 2 material?
ASTM A387 Grade 5 Class 2 is a high-quality chromium-molybdenum (Cr-Mo) alloy steel plate designed for weldable pressure vessels and boilers operating at elevated temperatures.
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.