ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel plate for high-temperature pressure vessels and boilers.ASTM A 387 Alloy Steel Gr Sheets and Plates are used in some typical applications such as Chemical and allied industries, Pressurized vessels, Heat exchangers, Ducting and pipe works, and Food. The essentials also come with these plates and sheets.
The ASTM A387 Alloy Steel Grade 11 CL 1 Plate has very high oxidation and corrosion resistance due to the presence of chromium. Additionally, it has given better-annealed conditions corrosion resistance. Outstanding temperatures, tensile strength, and yield strength are provided by molybdenum content. These ASTM A387 Alloy Steel Gr 11 CL 2 Plates exhibit outstanding tensile strength, toughness, and hardness. It is typically utilized in environments with high temperatures.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 621 B | ––– | A387-11-1 | ––– |
Specifications for ASTM A387 Grade 11 Alloy Steel Plates
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 11 | 1.25% | 0.50% |
Tensile Requirements for ASTM A387 Grade 11 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 11 |
| A387 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 ASTM A387 Grade 11 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| A387 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
Oil & Gas: Reactor shells, hydrotreating/hydrocracking units, high-temperature storage tanks, and piping in refineries.
Petrochemical Industry: Chemical reactors, storage vessels, and process equipment exposed to high temps.
Power Generation: Boiler drums, headers, and pressure parts in power plants.
General Pressure Vessels: Fabricating large pressure vessels and components for various industrial processes at elevated temperatures.
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What temperature is A387 Grade 11 class 1?
In the lower end of the temperature range SA 387 Gr 11 (1150 °F min tempering temperature) , and SA 387 Gr 22 (1250 °F min tempering temperature) are used. These grades can be specified in either class 1 or 2 and can also be provided in the Normalized & Tempered or Quenched and Tempered.
What is A387 Grade 11 class 1 equivalent to?
What is the ASTM A387 GR 11 equivalent to? Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade,DIN 13CRM044 in Germany, and BS 620B in the UK.