Chromium-molybdenum alloy steel plates for boilers and pressure vessels

This standard establishes technical specifications for chromium-molybdenum steel plates intended for use in boilers and pressure vessels. It defines the chemical composition limits, mechanical properties, and testing methods required to ensure the structural integrity and safety of high-pressure equipment. The document outlines grading criteria based on tensile strength, yield strength, and elongation, while also specifying requirements for impact toughness and hardness. Heat treatment procedures are detailed to guarantee the desired microstructural characteristics, which are critical for withstanding elevated temperatures and internal pressures. The standard applies to plates of varying thicknesses used in the construction of industrial pressure-retaining components. It provides guidance on inspection procedures, including non-destructive testing and sampling methods, to verify compliance with the specified quality criteria. Additionally, it addresses marking, packaging, and storage guidelines to maintain material quality from production to final assembly. These provisions aim to harmonize manufacturing practices across the industry, ensuring that all steel plates meet consistent performance benchmarks for safe operation in demanding thermal and mechanical environments.