ASTM A387 Gr 11 Cl 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate, designated by the American Society for Testing and Materials (ASTM) standard A387, designed for welded boilers and pressure vessels used in high-temperature applications, offering excellent oxidation and corrosion resistance due to its ~1.25% Chromium and ~0.5% Molybdenum content.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 621 B | ––– | A387-11-1 | ––– |
Specifications for ASTM A387 Grade 11 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| 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:
Pressure Vessels & Boilers: Its core use is for fabricating equipment that stores and processes liquids/gases under high heat and pressure.
Oil & Gas Industry: Ideal for refining and processing equipment due to its resistance to high temperatures, oxidation, and sour (H2S) gas environments.
Petrochemical Plants: Used in reactors, heat exchangers, and piping where sustained high temperatures are a factor.
Power Plants: Utilized in components requiring high-temperature strength and stability.
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1.What is grade 11 steel?
SA 387 Grade 11 is a pressure vessel grade steel popular for use in high-temperature assignments based on its high tolerance to high temperatures.
2.What is the price of SA 387 GR 11 plate?
Alloy Steel Plate SA 387 GR 11 at ₹ 80/kilogram(s) | Alloy Steel Plates in Mumbai.
3.What is the composition of A387?
Composition: ASTM A387 steel plates typically contain chromium (up to 9% or more) and molybdenum (up to 2.25% or more), which enhance their strength and corrosion resistance at high temperatures.