Forklift telescopic booms are made of BHG700/BHG750 high-strength steel and are matched with wear-resistant liners.
The boom of a telescopic forklift is a core load-bearing component subjected to repeated extension and retraction and alternating loads. The boom body must be lightweight while resisting continuous sliding wear along the slide rails. Many manufacturers focus only on the grade of high-strength steel used in the main body, neglecting the matching of the base material and wear-resistant liners. This can easily lead to boom deformation, liner detachment, abnormal overheating of the slide rails, and premature wear, directly shortening the overall lifespan of the machine. BHG700 and BHG750 are mainstream high-strength steels for telescopic forklift booms. Properly matching them with wear-resistant liners is essential to achieving a balance between boom strength, lightweight design, and slide rail wear resistance.
BHG700 has a yield strength ≥600MPa, and BHG750 has a yield strength ≥680MPa. Both steels exhibit stable bending and welding properties, low internal stress, and are suitable for welding the boom body. For standard small-to-medium tonnage models with a lifting height of 12 meters or less, BHG700 steel is recommended. The steel plate thickness is typically 6-8mm, which helps control the overall weight while meeting load requirements, resulting in more cost-effective procurement. For large tonnage, long boom, and high-frequency heavy-duty operations, BHG750 steel is preferred. It offers superior buckling and fatigue resistance, making it suitable for 16-20 meter long-stroke telescopic booms. During manufacturing, it's crucial to control welding heat input to prevent a decrease in the toughness of the heat-affected zone of the high-strength steel. It's important to note that BHG700/BHG750, as structural high-strength steel, does not inherently possess high wear resistance. Direct friction between the bare steel plate and the boom slide rails is not recommended; wear-resistant liners must be installed for protection.
The selection of liner material should be comprehensively matched with the boom base material, telescopic sliding speed, and load size. Hard-on-hard metal friction is not advised. For ordinary construction site sand and gravel operations, NM400 thin wear-resistant steel liners can be used, fixed by welding or bolting, resisting extrusion and wear, and easy to replace. For heavy-duty, dusty mining conditions, self-lubricating wear-resistant slider liners are preferred to reduce the coefficient of friction and minimize track damage and abnormal noise. The liner thickness should not be too thick, as this will increase boom clearance and exacerbate swaying. We can provide a complete material selection solution for BHG700/BHG750 steel plates and matching liners based on the machine's tonnage and boom length, supporting laser cutting and bending prefabrication, and providing corresponding thickness and welding process suggestions to help machine manufacturers avoid material selection errors and reduce the rate of equipment failure and repairs later.