SA 387 Grade 11 Class 2 is a chromium-molybdenum alloy steel plate for high-temperature pressure vessels, offering excellent strength, weldability, and resistance to oxidation, commonly used in the oil, gas, and petrochemical industries for boilers, heat exchangers, and piping. It contains approximately 1.25% Chromium and 0.50% Molybdenum, providing superior performance in elevated temperature service and corrosive environments.
Specifications for ASME SA387 Grade 11 Class 2 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% |
Chemical Requirements for ASME SA387 Grade 11 Class 2 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
Oil & Gas: Pressure vessels, storage tanks, and piping for handling hot liquids and gases.
Petrochemical & Chemical Processing: Equipment exposed to high temperatures and corrosive media.
Power Generation: Boilers, heat exchangers, and other components operating under severe conditions.
Industrial Boilers: Welded boilers requiring strength and durability at elevated temperatures.
Advantages
Excellent High-Temperature Mechanical Properties: Higher strength than Grade 11 Class 1, resisting creep and maintaining stability under long-term high-temperature and high-pressure conditions.
Strong Corrosion & Oxidation Resistance: Chromium-molybdenum synergy enables resistance to sulfide stress cracking, chloride corrosion and high-temperature oxidation, suitable for sour gas and acidic media.
Reliable Weldability: Retains good weldability with high strength, forming durable joints via standard processes for large welded equipment.
Stable Structural Tolerance: Withstands thermal cycles, resists deformation/failure, extending equipment service life and reducing maintenance costs.
Wide Industrial Applicability: ASME-compliant, suitable for oil and gas, thermal power, chemical industries, for pressure vessels, boilers and heat exchangers.
Get an valued quotation for SA 387 Grade 11 Class 2 , Contact GNEE Steel.
1.What is SA 387 11 2 material?
SA 387 GR. 11 CL. 2 Plate is a heat-resistant and corrosion-resistant steel plate that is resistant to high temperatures, stress and creep. sa 387 gr 11 cl 2 material also has good impact strength and weldability.
2.What temperature is SA 387 GR 11?
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.