SA 387 GR 11 is a chromium-molybdenum Alloy steel plate used in the fabrication of pressure vessels and boilers. It is known for its high-temperature resistance and is widely used in the chemical and power generation industries.
Tensile Strength:
Class 1 (CL1): Has a lower tensile strength. It generally ranges from 415 MPa to 585 MPa (60 to 85 ksi).
Class 2 (CL2): Has a higher tensile strength, ranging from 485 MPa to 620 MPa (70 to 90 ksi).
Minimum Yield Strength:
Class 1 (CL1): Typically has a minimum yield strength of around 240 MPa (35 ksi).
Class 2 (CL2): Typically has a minimum yield strength of around 275 MPa (40 ksi).
Heat Treatment:
Class 1 (CL1): Usually supplied in an "as-rolled" condition.
Class 2 (CL2): Supplied in a "normalized and tempered" or "quenched and tempered" condition, which enhances the material's mechanical properties.
Applications:
Class 1 (CL1): Used in applications where a moderate level of mechanical strength is required.
Class 2 (CL2): Preferred for applications where higher mechanical strength is needed.
Impact Resistance:
Class 2 (CL2): Generally offers better impact resistance due to its higher tensile and yield strength.
In summary, Class 2 (CL2) has higher tensile and yield strength compared to Class 1 (CL1), making it suitable for more demanding applications requiring greater mechanical strength and impact resistance. The choice between CL1 and CL2 depends on the specific requirements of the project, such as the necessary strength, temperature resistance, and impact properties.
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