A Controlled Rolling and Controlled Cooling Process for Eliminating Cementite Widmanstatten Structure of Hypereutectoid Tool Steel Wire Rod
A Widmanstatten structure, controlled rolling and controlled cooling technology, applied in manufacturing tools, workpiece cooling devices, metal rolling, etc., can solve problems such as reduced service life and high brittleness of wire rods, reduce production costs, and eliminate cementite Widmansteller tissue, the effect of inhibiting the formation of Widmanstatten tissue
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Embodiment 1
[0039] 1. Billet heating:
[0040] Billet composition C: 1.25%, Si: 0.12%, Mn: 0.25%, P≤0.015%, S≤0.020%, Cr: 0.61%, Ni≤0.10%, Cu≤0.15%.
[0041] The continuous casting billet with a section of 160mm*160mm is heated at a temperature of 1210-1250°C for 1.5 hours, and the air-fuel ratio is 0.45-0.65.
[0042] 2. Controlled rolling
[0043] The starting temperature of rough rolling is 1100~1130℃, the rolled piece enters the finishing rolling unit for rolling, the rolling temperature of the finishing rolling unit is 720~730℃, and the rolled piece rolled by the finishing rolling unit enters the reducing and sizing unit to be rolled into finished wire rod The specification is Φ10.0mm, the rolling temperature of the reducing and sizing unit is 720-730°C, and the final rolling temperature is 760-780°C.
[0044] 3. Silk spinning
[0045] After the final rolling, the wire rod is formed into coils through the laying machine, and the laying temperature is 700-720°C.
[0046] 4. Contro...
Embodiment 2
[0049] 1. Billet heating:
[0050] Billet composition C: 1.25%, Si: 0.12%, Mn: 0.25%, P≤0.015%, S≤0.020%, Cr: 0.61%, Ni≤0.10%, Cu≤0.15%. The continuous casting billet with a section of 160mm*160mm is heated at a temperature of 1210-1250°C for 2 hours, and the air-fuel ratio is 0.45-0.65.
[0051] 2. Controlled rolling
[0052] The starting temperature of rough rolling is 1130~1150℃, the rolled piece enters the finishing rolling unit for rolling, the rolling temperature of the finishing rolling unit is 730~750℃, and the rolled piece rolled by the finishing rolling unit enters the reducing and sizing unit to be rolled into finished wire rod The specification is Φ10.0mm, the rolling temperature of the reducing and sizing unit is 730-750°C, and the final rolling temperature is 780-800°C.
[0053] 3. Silk spinning
[0054] After the final rolling, the wire rod is formed into coils through the laying machine, and the laying temperature is 720-730°C.
[0055] 4. Control cooling ...
Embodiment 3
[0058] 1. Billet heating:
[0059] Billet composition C: 1.25%, Si: 0.12%, Mn: 0.25%, P≤0.015%, S≤0.020%, Cr: 0.61%, Ni≤0.10%, Cu≤0.15%. The continuous casting billet with a section of 160mm*160mm is heated at a temperature of 1210-1250°C for 1.5 hours, and the air-fuel ratio is 0.45-0.65.
[0060] 2. Controlled rolling
[0061] The starting temperature of rough rolling is 1100~1130℃, the rolled piece enters the finishing rolling unit for rolling, the rolling temperature of the finishing rolling unit is 730~750℃, and the rolled piece rolled by the finishing rolling unit enters the reducing and sizing unit to be rolled into finished wire rod The specification is Φ10.0mm, the rolling temperature of the reducing and sizing unit is 730-750°C, and the final rolling temperature is 760-800°C.
[0062] 3. Silk spinning
[0063] After the final rolling, the wire rod is formed into coils through the laying machine, and the laying temperature is 700-720°C.
[0064] 4. Control cooling...
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