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Heat treatment and surface treatment method of S355J0WP steel

S355J0WP steel is a weathering steel commonly used to make components for Bridges, buildings and other structures. The following are the details of its heat treatment and surface treatment methods:

Heat treatment:
1. Solution Treatment: Heat S355J0WP steel to a temperature range of 850°C to 900°C, and keep it for a period of time, so that it is completely dissolved. It is then cooled rapidly, usually by water or oil quenching. Solution treatment helps to improve the mechanical properties of steel, especially strength and toughness.

2. Quenching: After the solution treatment is completed, the S355J0WP steel heated to a temperature range of 925°C to 960°C is cooled rapidly. Commonly used quenching media include water, oil and polymer solutions. Quenching can increase the hardness and strength of steel.

Surface treatment:
1. Pickling: Pickling is the removal of oxidation layers and other surface contaminants by soaking S355J0WP steel in an acidic solution. Common pickling solutions include hydrochloric acid and sulfuric acid. Pickling can improve the surface quality and corrosion resistance of steel.

2. Shot Blasting: Shot blasting is to impact the surface of S355J0WP steel by using metal particles or sand sprayed at high speed to remove the oxide layer, dirt and initial stress. This treatment method can improve the appearance quality and surface properties of the steel and improve the adhesion of the coating.

3. Anti-corrosion Coating: Special anti-corrosion coating is applied on the surface of S355J0WP steel to provide additional protection, reduce the risk of corrosion and extend its service life. Common anti-corrosion coatings include hot-dip galvanizing, electroplating, spraying coatings and so on.

It is important to note that the specific heat treatment and surface treatment methods may vary depending on the process requirements and manufacturer recommendations. Therefore, before any processing, be sure to refer to the relevant technical documents or consult a professional to ensure the correct processing methods and parameters.