ASTM A387 Grade 11 Class 1 is a type of chromium - molybdenum alloy steel plate specifically designed for high-temperature pressure-bearing equipment, which is regulated by the ASTM A387/A387M standard. It is widely used in industries like petrochemicals and power generation due to its excellent performance.
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 |
Mechanical Property
| Grade | Mechanical Property | ||||
| Tensile Strength(MPa) | Yield Strength(MPa) min | % Elongation in 2 in.(50mm) min | Impacting Test Temperature(°C) | ||
| A387 Grade 11 Class1(A387GR11CL1) | 415-585 | 240 | 22 | -20,40,-60 | |
Applications
Pressure Vessels & Boilers: Fabrication of equipment for storing and processing high-temperature fluids and gases.
Refineries & Petrochemical Plants: Used in reactors, heat exchangers, and storage tanks exposed to demanding conditions.
Power Generation: Suitable for energy projects requiring thermal stability and structural integrity at elevated temperatures.
Sour Gas Service: Its chromium content offers enhanced resistance to oxidation and corrosion, making it ideal for hydrogen-rich or sour gas environments.
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What is the price of A387 Grade 11 CL 1?
The price of ASTM A387 Grade 11 Class 1 (A387 Gr. 11 Cl. 1) steel plate varies significantly based on supplier, quantity, dimensions, and current market conditions, but expect prices generally ranging from around $800 to over $3,000 per ton (USD), or sometimes quoted per kilogram, as it's a specific alloy for pressure vessels, with suppliers like Priminox Overseas offering ranges like $1,000-$3,200/ton and others providing specific project quotes.
What temperature is A387 Grade 11 CL 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.