ASTM A387 Grade 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate, defined by ASTM A387/A387M standard, specifically for welded boilers and high-temperature pressure vessels, featuring 2.0-2.5% Chromium and ~1% Molybdenum for improved strength and corrosion resistance.
Equivalents for ASTM A387 Grade 22 Alloy Steel Plates
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | A387-22-1 | 10 CRMO910 |
Specifications for ASTM A387 Grade 22 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 22 | 2.25% | 1.00% |
Tensile Requirements for ASTM A387 Grade 22 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 22 |
| A387 Grade 22 | Tensile strength, ksi [MPA] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 45 [310] | |
| Elongation in 8 in. [200mm], min % | ... | |
| Elongation in 2 in. [50mm], min, % | 18 | |
| Reduction of area, min % | 45 (measured on round specimen) 40 (measured on flat specimen) |
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 |
Key Characteristics:
Material Type: Chromoly (Chromium-Molybdenum) Alloy Steel.
Standard: ASTM A387/A387M (also ASME SA387).
Composition: Contains approximately 2.25% Chromium (Cr) and 1.00% Molybdenum (Mo).
Application: Used for high-temperature service in pressure vessels, boilers, heat exchangers, and in the oil, gas, and petrochemical industries.
Class Distinction: "Class 1" refers to a specific mechanical property set, with lower tensile strength requirements (e.g., 60-85 ksi) than Class 2 (75-100 ksi), while chemical composition remains the same for both classes.
Applications
Oil & Gas: Pressure vessels, storage tanks, piping in refineries, and offshore drilling.
Power Generation: Boilers, heat exchangers, and components in thermal power plants.
Chemical Processing: Equipment in plants requiring high-temperature resistance and corrosion protection.
Petrochemicals: Equipment for processing and storage.
Heat Exchangers: Efficient heat transfer in various industrial settings.
General Manufacturing: Used in machinery, shipbuilding, and other areas needing robust, high-temp steel.
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1.What is A387 material?
A387 Grade 12 Class 2 is a high quality chrome molybdenum steel which is ideal for elevated temperature service and offers excellent anti corrosion characteristics. The steel has a wide range of uses including industrial boilers and pressure vessels, especially in environments where high temperature levels are common.
2.What is A387 gr22 equivalent to?
Other designations that are equivalent to AISI A387 grade 22-PVQ alloy steel include the following: ASTM A182 (F22-1) ASTM A199 (T22) ASTM A200 (T22)
3.What is the difference between A182 and A387?
Both ASTM A182 grade F11 class 2 and ASTM A387 grade 22 steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.