SA203 Grade B for High Tensile Steel Plate

1.What are the chemical compositions and mechanical properties of SA203 Grade B for high tensile steel plate?

2.Where are the main applications of SA203GrB?

Petroleum industry: Used for manufacturing pressure vessels and pipelines in various petroleum equipment.

Chemical industry: Used for manufacturing reactors, heat exchangers and other chemical equipment.

Coal chemical industry: Used for manufacturing large low-temperature equipment in coal chemical projects, such as CO₂ absorption towers and H₂S absorption towers.

Cryogenic separation processing: Used for manufacturing pressure vessels and pipelines in cryogenic separation equipment.

Air separation: Used for manufacturing related components in air separation equipment.

Liquefied gas storage: Used for manufacturing pressure vessels in liquefied gas storage equipment.

3.What are the main production processes of SA203GrB?

Smelting: Strictly control the chemical composition and impurity content to ensure the performance and quality of the steel plates. This involves precise management of elements such as nickel (Ni), chromium (Cr), and molybdenum (Mo), while minimizing sulfur (S), phosphorus (P), and other harmful impurities.

Rolling: Adjust rolling parameters (e.g., reduction ratio, pass sequence) and rolling temperature to obtain steel plates with excellent mechanical properties and surface quality. The process typically involves hot rolling at high temperatures to achieve uniform grain structure and dimensional accuracy.

Heat Treatment: Primarily used to eliminate residual stress inside the steel plates and improve performance stability. Common heat treatment processes include:

• Normalizing: Heating the steel to a critical temperature above the upper transformation point, then cooling it in air to refine the grain structure.
• Tempering: Heating the normalized steel to a lower temperature and cooling it slowly to relieve internal stress and optimize the balance of strength and toughness.