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In the manufacturing industry, H-beams are used in a wide range of applications, from building structures to machine building. Shot blasting is a key process before the use of H-beam, which can not only remove impurities such as rust and oxide scale on the steel surface, but also improve the roughness of the steel surface and enhance the adhesion of the subsequent coating. Among them, it is very important to choose the appropriate steel shot type when shot blasting and rust removal, which directly affects the rust removal effect and work efficiency.

Factors influencing the selection of steel shot model

• Specifications of H-beams: Specifications such as flange width, web thickness and overall length of H-beams have an important impact on the selection of steel shot models. Generally speaking, large H-beams require a larger size of steel shot due to their large surface area to ** sufficient striking force and coverage area to improve rust removal efficiency. For example, for large H-beams with flangewidths of more than 400mm, it may be necessary to choose a shot with a diameter of 1.5 - 2.0mm. On the other hand, small H-beams have a relatively small surface area, and the use of oversized steel shots may cause local overblows and damage to the steel surface, so it is more appropriate to choose steel shots with a diameter of 0.8 - 1.2mm.

 • Degree of corrosion on the surface of the steel: If the surface of the H-beam is severely corroded, there are a large number of thick rust layers and oxide scales, and a large size and high hardness steel shot is required for strong impact to effectively remove the corrosion. Usually a steel shot with a diameter of 1.5 - 2.5mm is suitable for this situation. On the contrary, if the rust on the surface of the steel is light and only slightly floating, the use of a smaller diameter steel shot, such as a 0.5 - 1.0mm steel shot, can achieve the purpose of rust removal without causing unnecessary damage to the steel surface.

• Requirements for surface roughness: Different application scenarios have different requirements for the surface roughness of H-beams. In some occasions that require strong coating adhesion, such as anti-corrosion coating of building steel structures, high surface roughness is required. In this case, steel shots with a diameter of 1.0 - 1.8mm can be selected, and through their impact action, the steel surface forms a suitable roughness, which is conducive to better adhesion of the coating. For some occasions with high surface quality requirements and relatively low roughness requirements, such as the manufacture of some mechanical parts, smaller diameter steel shots, such as 0.6 - 1.2mm, can be selected to avoid excessive roughness affecting subsequent processing.

 Common steel shot models and applicable scenarios

• S110 Shots: Approximately 0.5 - 0.7mm in diameter, they are smaller models. It is suitable for situations where the surface of H-beam is lightly corroded and the surface roughness is not required. For example, some newly produced H-beams only have slight floating rust during short-term storage, and the use of S110 steel shot for shot blasting can not only quickly remove the floating rust, but also keep the steel surface relatively smooth, without affecting the subsequent processing process.

• S230 Shot: Available in diameters between 1.0 and 1.4mm, it is a versatile shot type. For most ordinary H-beams with a moderate degree of surface corrosion, S230 steel shot can provide a good rust removal effect. It can effectively remove medium thickness rust layers and oxide scales while forming a moderate roughness on the steel surface to meet general coating and processing requirements. Whether it's H-beams for framing in the construction industry or H-beams for structural parts in machine building, S230 steel shots have a wide range of applications.

• S330 Shots: 1.5 - 2.0mm in diameter, which is a larger type of steel shot. When the size of the H-beam is large and the surface is heavily corroded, S330 steel shot can quickly and effectively remove thick rust layers and stubborn oxide scale with its large size and high impact energy. For example, in some waste H-beam recycling projects that have been stored in the open air for a long time, due to the serious corrosion of the steel surface, the use of S330 steel shot for shot blasting and rust removal can restore the metallic luster of the steel surface and lay the foundation for subsequent processing.

The selection of steel shot model when H-beam shot blasting and rust removal needs to consider many factors. Only according to the actual situation of H-beam, accurately select the appropriate steel shot model, in order to achieve the ideal rust removal effect, improve production efficiency, and at the same time, the quality and performance of H-beam meet the needs of different application scenarios.

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