How to prevent cracks in weather resistant A588 Gr B steel cutting

Q345R steel is common low alloy steel, which is commonly used for boiler and pressure vessel. The delivery status includes hot rolling or normalizing. Q345R steel yield strength is 265-345MPa, tensile strength is 510-640MPa, elongation is greater than 21%, and zero degree V-shaped impact energy is greater than 34J. Q345R steel standard is GB713. Q345R steel has good comprehensive mechanical and technological properties. The content of weather resistant A588 Gr B steel phosphorus and sulfur of Q345R steel is slightly lower than that of low alloy high strength steel plate.

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Quenching is a common heat treatment process. It is the metal heat treatment process in which the weather resistant A588 Gr B steel metal workpiece is heated to a proper temperature and kept for a period of time, then immersed in the quenching medium for rapid cooling. Quenching can improve the strength and hardness of steel in a large range, and adjust the coordination between weather resistant A588 Gr B steel strength and hardness, plasticity and toughness. Quenching is generally used as the final heat treatment.

The basic phases of weather resistant A588 Gr B steel, structural steel in the annealed state are ferrite and carbide. The alloy elements are dissolved in ferrite to form alloy ferrite, which depends on solid solution strengthening to increase strength and hardness, but at the same time reduce plasticity and toughness. The addition of alloying elements reduces the carbon content of the eutectoid point, which increases the proportion of pearlite in the structure and reduces the distance of the pearlite layer. This also increases the strength of the steel and reduces the plasticity.

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