Mining equipment operates under some of the harshest conditions found in any industry. A loader bucket edge can scrape against granite thousands of times per shift. A cone crusher liner can process hundreds of tonnes of ore before it needs replacement. A conveyor idler may rotate for 20 hours a day while carrying rock fragments that weigh hundreds of kilograms. In all of these cases, the spare part must match the original equipment specification, but it should also be improved where possible through better alloys, tighter tolerances, and more consistent heat treatment.
YS STEEL has spent over two decades refining the manufacturing processes for these components. We understand that a poorly fitted jaw plate can reduce crusher throughput by 10 to 15 percent. A substandard bucket tooth can break during the first digging cycle and cause damage to the adapter or the bucket itself. That is why our engineering approach starts with material selection and does not end until the part has passed dimensional, hardness, and ultrasonic inspection.
These parts are cast from high manganese steel grades such as Mn14Cr2, Mn18Cr2, and Mn22Cr2, or from high chromium white iron for secondary crushing applications. Work hardening increases surface hardness from approximately 220 HB to over 550 HB under repeated impact, which extends service life significantly.
YS STEEL produces G.E.T. components using low-alloy steel castings, through-hardened to achieve a balance between impact toughness and abrasion resistance. Hardness ranges from 45 HRC to 58 HRC depending on the application, and all products are designed for easy field replacement using standard locking pins.
Conveyor downtime can halt the entire material handling chain. YS STEEL idlers are manufactured with precision-machined steel shells, double-sealed deep groove ball bearings, and labyrinth seals to keep out dust and moisture. Load ratings and bearing sizes are matched to CEMA or ISO standards to ensure compatibility with existing conveyor frames.
Screen media must deliver accurate particle separation while resisting blinding and wear. YS STEEL supplies polyurethane panels with Shore A hardness from 70 to 95, wire mesh made from high-tensile spring steel, and rubber buffers engineered to absorb vibration without cracking.
Hydraulic failures are often caused by contaminated oil or degraded seals. YS STEEL supplies seal kits made from nitrile, polyurethane, and fluoroelastomer compounds that match OEM temperature and pressure ratings. Cylinders are available as complete assemblies with hard chrome plated rods and honed tubes.
Undercarriage wear depends heavily on ground conditions and operator habits. YS STEEL track components are induction hardened on contact surfaces and assembled with sealed and lubricated track (SALT) technology to reduce internal wear and extend service intervals.
The following tables provide typical parameter ranges for YS STEEL spare parts. Each order is confirmed against the customer's machine model, serial number, and dimensional drawings before production begins.
| Parameter | Mn14Cr2 | Mn18Cr2 | Mn22Cr2 |
|---|---|---|---|
| Initial hardness (BHN) | 200 – 230 | 210 – 240 | 220 – 250 |
| Work-hardened surface hardness (BHN) | 450 – 520 | 500 – 560 | 550 – 620 |
| Impact toughness (J/cm²) | ≥ 147 | ≥ 120 | ≥ 90 |
| Elongation (%) | ≥ 25 | ≥ 20 | ≥ 15 |
| Typical application | Soft to medium rock | Medium to hard rock | Hard rock and heavy impact |
| Lifespan under abrasive ore (hours) | 400 – 800 | 600 – 1,200 | 900 – 1,600 |
| Tooth Type | Weight (kg) | Length (mm) | Hardness (HRC) | Material Grade | Compatible Excavator Class |
|---|---|---|---|---|---|
| YS-T20 | 8.5 | 310 | 48 – 52 | Alloy steel casting | 20 – 25 tonnes |
| YS-T30 | 13.2 | 365 | 49 – 53 | Alloy steel casting | 30 – 35 tonnes |
| YS-T40 | 21.8 | 420 | 50 – 55 | Low-alloy through-hardened | 40 – 50 tonnes |
| YS-T65 | 39.0 | 510 | 52 – 56 | Low-alloy through-hardened | 65 – 75 tonnes |
| YS-T100 | 67.5 | 610 | 54 – 58 | High-strength cast alloy | 100 – 120 tonnes |
| Roller Diameter (mm) | Wall Thickness (mm) | Bearing Size | Dynamic Load Rating (kN) | Max Belt Speed (m/s) | Operating Temperature (°C) |
|---|---|---|---|---|---|
| 89 | 3.2 | 6204-2RS | 12.8 | 3.5 | -20 to +80 |
| 108 | 3.5 | 6205-2RS | 14.0 | 4.0 | -20 to +80 |
| 133 | 4.0 | 6305-2RS | 22.5 | 4.5 | -20 to +80 |
| 159 | 4.5 | 6306-2RS | 29.0 | 5.0 | -20 to +80 |
| 178 | 5.0 | 6307-2RS | 33.5 | 5.5 | -20 to +80 |
| Seal Material | Temperature Range (°C) | Max Pressure (bar) | Fluid Compatibility | Typical Cylinder Bore Range (mm) |
|---|---|---|---|---|
| Nitrile (NBR) | -30 to +100 | 250 | Mineral oil, water glycol | 40 – 300 |
| Polyurethane (PU) | -20 to +110 | 350 | Mineral oil, biodegradable fluids | 50 – 400 |
| Fluoroelastomer (FKM) | -15 to +200 | 300 | Mineral oil, synthetic esters | 50 – 350 |
| PTFE compound | -50 to +220 | 400 | Most hydraulic fluids | 40 – 500 |
Mining machinery spare parts must fit perfectly on the first installation attempt. Even a small deviation in a jaw plate mounting slot can cause stress concentration and premature failure. YS STEEL uses CNC machining centers, horizontal boring mills, and large-capacity lathes to finish cast and forged components to tolerances as tight as ±0.02 mm on critical mounting surfaces. Coordinate measuring machines (CMM) verify dimensions against 3D CAD models or customer-supplied drawings. All machined parts are deburred, cleaned, and protected with anti-corrosion coating before packing.
Every shipment from YS STEEL includes a material certificate, dimensional inspection report, and heat treatment record. Customers can trace each part back to its raw material batch, which supports compliance with ISO 9001 and mining industry audit requirements.
Start by gathering the machine make, model, and serial number. If the original part has a visible OEM part number, include that as well. Take clear photos of the part from multiple angles and measure key dimensions such as bolt hole spacing, shaft diameter, overall length, and thickness. YS STEEL’s engineering team can cross-reference this data with existing databases or reverse-engineer the part from a sample. For custom parts, we create a 3D CAD model and send it for approval before casting or machining begins. This process reduces the risk of ordering the wrong component and ensures compatibility with your existing equipment.
The answer depends on the type of wear. High manganese steel grades such as Mn14Cr2, Mn18Cr2, and Mn22Cr2 are ideal for impact wear because they work-harden on the surface while the core remains tough. For sliding abrasion with low impact, high chromium white iron with 20 to 30 percent chromium provides superior wear resistance. Low-alloy steels like 42CrMo and 30CrNiMo8 are used for structural components that need high strength and fatigue resistance. YS STEEL recommends materials based on the specific ore type, feed size, equipment speed, and operating temperature to maximize service life.
Quality control begins with incoming raw material inspection and continues through every production stage. Spectrometers verify the chemical composition of each heat. Patterns and molds are checked against CAD models before pouring. After casting, parts undergo ultrasonic testing to detect internal porosity or cracks. Machined surfaces are inspected with CMM to confirm dimensional accuracy. A final audit includes visual inspection, hardness testing, and coating thickness measurement. Each batch is accompanied by full documentation, so customers can trace the manufacturing history of the part they receive.
Standard wear parts such as jaw plates, cone liners, and bucket teeth are usually available from stock or can be produced within 15 to 30 days. Custom parts that require new patterns or molds may take 35 to 60 days depending on complexity and casting weight. For urgent breakdowns, YS STEEL offers expedited production using existing patterns and flexible machining capacity. Lead times are confirmed during quotation, and we provide weekly progress updates to keep your maintenance planning on schedule.
Yes. YS STEEL manufactures spare parts that are fully compatible with major OEM mining equipment brands, including Metso, Sandvik, Terex, Komatsu, Caterpillar, Hitachi, Volvo, and Epiroc. We can produce parts based on OEM part numbers, customer samples, or reverse-engineered drawings. Our aftermarket parts are designed to meet or exceed the original performance in terms of material hardness, dimensional accuracy, and wear life. We also offer customized improvements, such as thicker wear plates or upgraded seal designs, where field experience shows the OEM part has a weak point.
YS STEEL provides a warranty against manufacturing defects for a period of 6 to 12 months from the date of shipment, depending on the product category. The warranty covers material and workmanship failures under normal operating conditions. It does not cover damage caused by improper installation, misuse, or normal wear. If a part fails during the warranty period, we will replace it free of charge or issue a credit note. For any warranty claim, we require photos of the failed part, operating conditions, and installation records so our engineers can determine the root cause and prevent recurrence.
Many aftermarket mining machinery spare parts fail early because the supplier uses lower-cost materials or skips critical heat treatment steps. YS STEEL operates its own foundry and machining facility, which gives us direct control over chemistry, pouring temperature, cooling rate, and machining accuracy. Our parts are tested to the same standards as OEM components, and we retain full traceability from raw material to finished product. This reduces the total cost of ownership by lowering failure rates, preventing unscheduled downtime, and minimizing the risk of secondary damage to adjacent components.
For procurement teams, working with YS STEEL means consistent quality across repeat orders. We maintain pattern and drawing archives for thousands of part numbers, so reordering a spare part months or years later produces the same fit and performance. Every part is marked with a unique heat number and YS STEEL logo, allowing quick identification in the warehouse. This level of control is especially important in remote mining sites where a failed part can stop production for days.
