Tempered Customized Casting Steel Spool Of Cold Rolled Silicon Steel Coil
GW Precision manufactures customized 35CrMoV casting steel spools for cold rolled silicon steel coil tempering and related high-precision rolling applications. The representative specification is 565 × 505 × 1700 mm. The steel spool blank is produced by centrifugal casting, followed by controlled heat treatment, precision machining and corresponding inspection. GW Precision applies strict requirements to the concentricity, dimensional accuracy, cylindrical symmetry and dynamic balance of the steel spool. With its own professional process design, development and manufacturing capability, together with proven machining technology, the company provides customized steel spool solutions according to rolling mill drawings and operating requirements.
- GW Precision
- China，Luoyang
- Contractual Stipulation
- Anual Capacity of Steel Spool is 4000 pieces
- Information
Tempered Customized Casting Steel Spool Of Cold Rolled Silicon Steel Coil
Application and Operating Conditions
The customized casting steel spool is suitable for cold rolling equipment used for silicon steel coil and other precision strip products. During cold rolling, the spool may withstand radial pressure of hundreds of tons and repeated alternating loads. It also transmits torque to drive the rolling mill and support high-precision rolling, where strip thickness tolerance can reach approximately ±1–3 μm. Typical operating speed is 300–800 rpm, requiring suitable fatigue and wear resistance for long-term cyclic operation.
Cold rolling temperature is normally ≤120°C, while local frictional heat can reach approximately 200°C. The steel spool therefore needs to maintain stable mechanical and dimensional performance under repeated loading and changing thermal conditions. It must also be compatible with rolling oil to help resist corrosion and adhesive wear. Typical equipment includes four-roll and six-roll cold rolling mills, such as Sendzimir mills and UC-MILL, as well as high-precision rolling mills used for automotive sheet and tin-plated sheet.
35CrMoV Material and Mechanical Properties
The material is 35CrMoV, supplied in the quenched and tempered condition. Typical mechanical properties include a tensile strength of 900–1100 MPa according to GB/T 228.1 (ISO 6892), yield strength of 750–950 MPa, elongation of ≥12% with a gauge length of 5d, impact energy of ≥50 J at room temperature according to GB/T 229 (ISO 148), hardness of HRC 28–35 according to GB/T 230.1, and sectional shrinkage of ≥45%.
For products with specific mechanical property requirements, GW Precision carries out controlled heat treatment and corresponding mechanical property testing. This process helps ensure that the finished 35CrMoV casting steel spool reaches the required material condition for its intended rolling application.
Manufacturing and Precision Machining
GW Precision uses centrifugal casting to produce the steel spool blank. The casting process is controlled to reduce defects such as cracks, slag inclusions, pores and sand holes, providing a reliable foundation for subsequent machining. For the inner-hole machining of ultra-long steel spools, the company has independently developed and manufactured a variable-speed self-feed deep-hole boring machine. This dedicated equipment provides a specialized machining solution for long internal holes.
The outer diameter is machined on a CNC lathe to control the dimensional accuracy of the outer surface.Through continuous process improvement, GW Precision has developed an integrated machining process for controlling the key technical indicators of the steel spool, including concentricity, cylindrical symmetry, dimensional accuracy and dynamic balance. These indicators are particularly important for rotating components operating at 300–800 rpm, where machining deviations or mass imbalance may affect running stability.
Quality Control and Customized Manufacturing
The manufacturing quality of a steel spool depends on the combined control of material, casting, heat treatment, machining and inspection. GW Precision manages these processes through its own professional process design, development and manufacturing capabilities. For customized 35CrMoV steel spools, the company can organize production according to customer drawings, material specifications, dimensions, mechanical properties, machining requirements and dynamic balance requirements.
The representative product is 565 × 505 × 1700 mm, while other dimensions can be manufactured according to the actual rolling mill configuration. By integrating centrifugal casting, heat treatment, deep-hole boring, CNC machining and quality inspection, GW Precision provides customized steel spool manufacturing for cold rolling equipment requiring high load capacity, repeated cyclic operation, dimensional accuracy and stable rotational performance.
