Product Category

　　Product Highlights
　　1. Ultra-high strength and safe load-bearing: Made from a single cast of ZGMn13 high-manganese alloy steel, it undergoes water toughening treatment to achieve an optimal balance of strength and toughness.
　　2. Impact‑induced self‑hardening: the more it is used, the more wear‑resistant it becomes. Under severe impact, high-manganese steel rapidly undergoes surface work hardening, resulting in a substantial increase in hardness, while its interior retains excellent toughness, effectively resisting both impact and abrasion from ore.
　　3. Precise molding, worry-free assembly: Pin holes and mating surfaces undergo rigorous inspection to ensure precise alignment with the bucket and pulley system.
　　User Pain Points
　　The drawbar is the core load-bearing component of an electric shovel’s bucket system, enduring substantial tensile, bending, and impact loads when the bucket is fully loaded with ore. Due to inadequate material selection and heat treatment, conventional drawbars are prone to fatigue failure or early cracking, which not only damages equipment but also poses a direct safety risk to on-site personnel.
　　Solution
　　Our company’s ZGMn13 high-manganese steel lifting beam is specifically designed for heavy-load conditions in open-pit mines. It is integrally cast and undergoes water‑tempering treatment, balancing strength and toughness. Thanks to the material’s unique work‑hardening under impact, the beam becomes increasingly wear‑resistant with continued use. The pin holes and mating surfaces are subject to rigorous dimensional inspection to ensure precise assembly and reliable operation.
　　I. Product Description
　　The product is integrally cast from ZGMn13 high-manganese alloy steel and features pin‑hole and square bearing sockets on both ends and the side flanges, enabling precise alignment with buckets and pulley blocks. Designed specifically for heavy‑load, high‑impact conditions in open‑pit mining, it is a critical component that ensures safe and efficient mine operations.
　　II. Product Specification Sheet

　　III. Product Features and Advantages
　　1. Ultra-high strength: After water toughening, ZGMn13 high-manganese alloy steel achieves an optimal balance of tensile strength, ductility, and toughness, ensuring safe and reliable load-bearing performance.
　　2. Impact-induced self-hardening: High-manganese steel undergoes surface work hardening under impact, becoming increasingly wear-resistant with use.
　　3. Precision Molding: The pinhole and mating surfaces undergo rigorous dimensional inspection, and both ends are equipped with pinholes and square bearing sockets, eliminating the need for fitting or adjustment during assembly.
　　IV. Why Choose Us
　　• Premium Raw Materials: Carefully selected high-quality scrap steel and billets, free of rust and oil, ensuring purity at the source. This guarantees a dense material with low levels of harmful impurities, laying the foundation for high tensile strength and impact toughness.
　　• Ultimate density: Ceramic sand combined with a large-diameter heating riser process effectively eliminates shrinkage porosity and cavities, ensuring a dense, uniform microstructure within the bucket handle. This design withstands tens of tons of tensile load and cyclic stress from the bucket without developing internal defects.
　　• Precise melting: Melting is performed using a Fuji electric furnace from Japan, with real-time compositional verification via a Bruker spectrometer from Germany, enabling precise control of carbon and manganese levels to ensure the lifting beam achieves an excellent balance of strength and toughness.
　　• Flawless Casting: A process involving baking at 850°C followed by bottom pouring significantly reduces sand hole defects, ensuring that the handle surface and critical load-bearing areas are free of casting flaws, thereby preventing stress concentrations that could lead to premature fracture.
　　• Strengthened metallography: 30-second rapid quenching plus an 800 m³ water‑stirring tank make it easier to obtain a uniform austenitic microstructure, achieving the “hard outside, tough inside” property for the beam—impact hardening on the surface while maintaining high toughness in the core, allowing it to withstand impacts from large ore pieces and frequent start‑stop cycles without fracturing.
　　• Powerful shot blasting: cleans and hardens the surface, revealing the metal’s natural luster and further enhancing the fatigue resistance of the beam’s surface, thereby extending its service life.
　　• Rigorous quality inspection: Manual dimensional checks ensure precise dimensions of critical features such as lifting beam attachment holes and pin-hole openings; magnetic particle and dye penetrant testing guarantee zero internal defects, eliminating the risk of fracture caused by internal flaws.
　　• Transparent delivery: Scan the QR code to track production progress in real time, with end-to-end visibility from material input to shipment, ensuring greater peace of mind for bulk deliveries.
　　V. Production and Quality Assurance
　　• Specializing in wear-resistant castings for harsh operating conditions: We are not a foundry chasing short-term deals; instead, we are rooted in China, focusing on the R&D and manufacturing of wear-resistant castings for demanding environments such as mining and power generation. Take the electric shovel lifting beam as an example: specifically optimized for the heavy-load tensile and impact conditions of open-pit mine bucket hoisting mechanisms, it is integrally cast from ZGMn13 high-manganese steel and undergoes water toughening treatment, balancing high strength with excellent toughness. The unique impact work-hardening property of high-manganese steel ensures that the lifting beam becomes more wear-resistant with continued use under sustained impacts. The pin holes and mating surfaces undergo rigorous dimensional inspection to ensure precise assembly and reliable operation, eliminating fracture risks at the source and safeguarding operational safety.
　　• We let the test data speak for itself, rather than merely talking about perfection: Casting processes are complex; we do not promise “zero defects,” but we do promise “zero excuses.” Each batch of lifting beams undergoes a full inspection process, including precise dimensional measurements of critical load-bearing areas and magnetic particle testing, to ensure the accuracy of key features such as lifting holes and pin-hole dimensions. This eliminates the risk of fracture caused by internal defects. Complete test reports are provided, demonstrating our commitment through data and action.
　　• Long-term partnerships: delivery is just the beginning. Our digital systems enable you to track production progress in real time, eliminating opaque operations; we respond immediately to quality concerns without delay; and each shipment includes a detailed test report for your quality records. We believe that a supplier’s attitude toward resolving issues truly reflects its value.
　　VI. Frequently Asked Questions (FAQ)
　　Q1: What is the minimum order quantity for beam handles?
　　Minimum order quantity is one piece; bulk orders qualify for better pricing.
　　Q2: What is the delivery time?
　　Customization based on your design takes 60–75 days; urgent orders can be expedited upon negotiation.
　　Q3: What packaging options are supported?
　　Fixed with iron brackets and wrapped in stretch film, or packed in wooden crates, to meet the requirements for sea and land transportation.
　　Q4: Can the customer’s logo be printed on the packaging?
　　Yes, but only for casting lettering on the non-working surface of castings.
　　Q5: What payment methods are supported?
　　T/T or L/C; for first-time cooperation, T/T is recommended, and phased payments can be negotiated.
　　Q6: How do you select the appropriate material grade?
　　We can provide expert material selection advice based on equipment model, operating conditions, impact intensity, and wear type. Please feel free to call us for more information.