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.
Specifications for ASTM A387 Grade 11 Alloy Steel Plates
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 11 | 1.25% | 0.50% |
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 Industry
This material is widely used in refinery core equipment and piping, applied to reactor shells under high pressure/corrosion, hydrotreating/hydrocracking units for desulfurization and oil upgrading, high-temperature storage tanks for oil products, and process piping transporting high-temperature fluids, ensuring structural integrity under cyclic loads.
Petrochemical Industry
It is a preferred option for high-temperature petrochemical equipment, used in chemical reactors for polymerization and alkylation, storage vessels holding ethylene and propylene, and process equipment like heat exchangers, withstanding high temperature, corrosion and pressure fluctuations.
Power Generation Industry
For thermal and combined-cycle plants, it is irreplaceable for key pressure parts: boiler drums separating steam and water under 500°C/10 MPa, headers for fluid distribution, and pipes/reheater tubes resisting thermal fatigue and creep, ensuring power generation efficiency.
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What is the difference between A 387 Grade 11 CL 1 and Class 2?
The main difference between A387 Grade 11 Class 1 and Class 2 is their mechanical strength, with Class 2 having higher tensile and yield strength, making it suitable for more demanding high-temperature, high-pressure applications, while both share the same chemical composition (approx. 1.25% Cr, 0.50% Mo) but differ in their specific strength requirements and sometimes elongation properties, as detailed in the standard.
What is the price of A387 Grade 11 CL 1 ?
The price of ASTM A387 Grade 11 Class 1 (Cr-Mo alloy steel plate) varies significantly by supplier, thickness, and quantity, often quoted per ton or per piece, ranging roughly from $800 to over $3,000 USD per ton, with specific examples showing figures like $1.54/kg or per-piece pricing dependent on dimensions, as it's a specialized material for high-temperature pressure vessels, not a commodity.