SA 387 GR 11 P Alloy Steel Rectangular Plates

SA 387 GR 11 P refers to a specific grade of alloy steel plates that conform to the ASTM/ASME standards. Here's a breakdown of what each part of the designation means:

1. SA 387: This indicates that the steel plate is part of the specification created by the American Society of Mechanical Engineers (ASME). SA stands for "Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum."

2. GR 11: This specifies the grade within the SA 387 specification. GR 11 denotes a grade of alloy steel plate with specific chemical composition requirements. In this case, it typically means it contains chromium and molybdenum as alloying elements.

3. P: This indicates that the plate is normalized and tempered. Normalizing involves heating the steel to a certain temperature and then allowing it to cool in air to remove internal stresses and improve its mechanical properties. Tempering is a process of reheating the steel to a lower temperature after hardening to improve toughness and ductility.

Regarding "Rectangular Plates," this simply describes the shape of the plates. They are typically supplied in rectangular or square shapes to suit various applications in construction, manufacturing, or as components in pressure vessels.

In summary, SA 387 GR 11 P alloy steel rectangular plates are specific types of plates that meet stringent standards for pressure vessel applications, designed to withstand high temperatures and pressures while maintaining structural integrity and corrosion resistance.