Appropriate hardness If the steel shot or steel sand is too soft, it will slow down the cleaning speed and reduce the work efficiency. During shot peening, steel shots that are too soft cannot produce suitable residual stress, and the force of low-hardness shots cannot be compensated by increasing the impact time.
The hardness of conventional steel shot is generally HRC40-50 (if the customer has no special requirements, this hardness range can fully meet the requirements)
Steel shot is made of high-quality steel scraps, which are first melted and then sprayed with high-pressure water to form the molten steel into small balls. The resulting shot is heated again to purify and homogenize it, and then quenched.
Centrifugal pelletizing in steel shot technology is a common production method. It uses centrifugal force to rotate molten steel or steel billet at high speed to form spherical steel shot.
The pellets are extremely less affected by nature and the water-soluble salt content is basically 0%, which effectively helps shipbuilding companies achieve the coating performance of the International Maritime Organization (IMO).
The process parameters that affect shot peening intensity mainly include: projectile diameter, projectile velocity, projectile flow rate, shot peening time, etc.
Steel shot is an important material for shot blasting machines in metal surface treatment. Among many metal surface treatment abrasives, steel shot is the most used and most cost-effective type.