SA 387 Gr 11 Cl 2 refers to a specific type of ASME/ASTM chromium-molybdenum alloy steel plate designed for high-temperature service in boilers and pressure vessels, featuring about 1.25% chromium and 0.5% molybdenum for strength and oxidation resistance, supplied in a normalized and tempered condition, with Class 2 indicating a specific higher tensile strength range.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 621 B | ––– | SA387-11-2 | ––– |
Specifications for ASME SA387 Grade 11 Alloy Steel Plates
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| SA387 Grade 11 | 1.25% | 0.50% |
Tensile Requirements for ASME SA387 Grade 11 Alloy Steel Plates Class 2 Plates
| Designation: | Requirement: | Grade 11 |
| SA387 Grade 11 | Tensile strength, ksi [MPa] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 43 [310] | |
| Elongation in 8 in. [200mm], min % | 18 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % | ––– |
Chemical Requirements for ASME SA387 Grade 11 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| SA387 Grade 11 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Heat Analysis: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.50 - 0.80 |
| Product Analysis: | 0.44 - 0.86 | |
| Chromium: | Heat Analysis: | 1.00 - 1.50 |
| Product Analysis: | 0.94 - 1.56 | |
| Molybdenum: | Heat Analysis: | 0.45 - 0.65 |
| Product Analysis: | 0.45 - 0.70 |
Typical Applications
High-pressure & High-temperature Pressure Vessels
It is the preferred material for manufacturing medium-to-high pressure vessels in petrochemical, chemical, and fertilizer industries, especially for equipment handling high-temperature reaction media, such as hydrogenation reactors, high-temperature storage tanks, and synthesis towers.
Advanced Boiler Systems
Used to fabricate key components of industrial boilers and power plant boilers, including superheater headers, reheater tubes, and high-temperature steam pipelines, adapting to the higher pressure and temperature operating requirements of modern boiler systems.
Oil & Gas Upstream & Midstream Equipment
Applied in offshore drilling platforms, subsea production systems, and onshore high-pressure gathering pipelines, suitable for sour gas (H₂S-containing) and high-temperature hydrocarbon fluid transportation and processing scenarios, with better resistance to stress corrosion.
Thermal Power & Combined-cycle Power Plants
Used to produce heat recovery steam generators (HRSGs) and high-temperature heat exchangers in combined-cycle power plants, where it withstands the dual effects of high-temperature flue gas and pressure, improving the overall efficiency of power generation systems.
Heavy Chemical Processing Equipment
Adopted in pulp and paper mills, pharmaceutical manufacturing, and non-ferrous metal smelting industries, for fabricating high-temperature and corrosion-resistant processing equipment such as digesters, heat exchangers, and catalytic reactors.
If you want to learn more about (SA 387 Gr 11 Cl 2)GNEE's products, you can send an email to beam@gneesteelgroup.com. We are more than happy to assist you.
1.What is SA 387 11 cl2 material?
11 CL. 2 Plate is a pressure vessel grade steel plate that is used in high-temperature applications. It is made of a chrome-moly alloy that contains molybdenum and chromium.
2.What is SA 387 Grade 11 Class 2 equivalent to?
SA 387 Grade 11 Class 2 is equivalent to ASTM A387 Grade 11 Class 2, as they are the same material under different standards (ASME/ASTM) for pressure vessels, featuring 1.25% Chromium and 0.50% Molybdenum with higher tensile strength than Class 1. Its nearest British Standard (BS) equivalent is BS 621B, while in European (EN) standards, it's similar to 13CrMoSi5-5, though direct equivalents aren't always perfect across all metrics.