SA387 Grade 11 Class 2 is a chromium-molybdenum alloy steel plate designed for high-temperature pressure vessels, offering superior strength and corrosion resistance, especially in oil, gas, and petrochemical applications, with "Class 2" indicating higher tensile and yield strength than Class 1 due to specified heat treatment, typically normalized and tempered.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 621 B | ––– | SA387-11-2 | ––– |
Specifications for ASME SA387 Grade 11 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| 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 |
Key Applications
Pressure Vessels & Separators: Used for storing and processing hot liquids and gases in refineries and chemical plants, where its resistance to hydrogen attack (HTHA) is crucial to avoid material failure under harsh conditions.
Boilers & Headers: Ideal for boiler drums, headers, and high-temperature piping systems in power plants, enduring extreme steam pressure and thermal stress reliably.
Heat Exchangers: Withstands thermal cycling and high operating temperatures in shell-and-tube heat exchangers, ensuring stable heat transfer efficiency.
Pipelines: For high-temperature and corrosive service, suitable for conveying aggressive media like sour gas in oil and gas operations.
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1.Is SA 387 carbon steel?
Weldable carbon steel plates for pressure vessels and boilers used in elevated temperatures. The material benefits from added chromium and molybdenum which gives the steel greater corrosion resistance and resistance to heat.
2.Is sa 387 grade 11 class 2 steel good?
Yes, SA 387 Grade 11 Class 2 steel is considered very good for its specific applications, offering excellent strength, corrosion, and oxidation resistance at elevated temperatures, making it ideal for pressure vessels, boilers, and pipelines in the oil, gas, and chemical industries, especially in high-heat or sour gas environments. Its chromium-molybdenum alloy composition provides enhanced performance over carbon steel for demanding conditions, with Class 2 offering higher tensile strength than Class 1.