Novel high carbon graphite steel roll ring and preparation method thereof
A graphite steel, high carbon technology, applied in furnace types, manufacturing tools, heat treatment equipment, etc., can solve the problems of thermal crack resistance, low roller ring hardness, poor wear resistance, etc., to reduce element segregation, reduce casting Stress, thermal crack reduction effect
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Embodiment 1
[0020] [Example 1] The three-layer chemical composition of the new high-carbon graphite steel roll ring of the present invention is: outer chemical composition C: 2.30%; Si: 1.50%; Mn: 1.00%; Cr: 1.00%; Ni: 3.20%; Mo: 0.60%; V: 0.30%; Nb: 0.30%; P: 0.025%; S: 0.025%; Ba+Ca: 0.45%; Re: 0.20%; ; Mn: 0.60%; Cr: 0.30%; Ni: 0.20%; Mo: 0.15%; P: 0.025%; S: 0.025%; P: 0.025%; S: 0.025%. The balance is Fe and a small amount of residual elements.
[0021] When the new high-carbon graphite steel roll ring is cast, the casting temperature is 60°C of liquidus temperature.
[0022] The design value of the surface hardness of the new high carbon graphite steel roller ring is 65-75HSD, the actual product is 66.2HSD, the design value of the hardness drop from the surface of the roller ring to the groove bottom is ≤2HSD, and the actual product is 1.7HSD.
[0023] The metallographic structure of the new high carbon graphite steel roll ring matrix is: spherical graphite + Mo 2 C 6 , NbC, V ...
Embodiment 2
[0030] [Example 2] The three-layer chemical composition of the new high-carbon graphite steel roll ring of the present invention is: outer chemical composition C: 2.40%; Si: 1.40%; Mn: 0.70%; Cr: 0.60%; Ni: 3.10%; Mo: 0.80%; V: 0.50%; Nb: 0.35%; P: 0.015%; S: 0.010%; Ba+Ca: 0.55%; Re: 0.25%; ; Mn: 0.70%; Cr: 0.35%; Ni: 0.25%; Mo: 0.25%; P: 0.020%; S: 0.020%; P: 0.015%; S: 0.010%. The balance is Fe and a small amount of residual elements.
[0031] When the new high-carbon graphite steel roll ring is cast, the casting temperature is 70°C of liquidus temperature.
[0032] The design value of the surface hardness of the new high carbon graphite steel roller ring is 65-75HSD, the actual product is 67.4HSD, the design value of the hardness drop from the surface of the roller ring to the groove bottom is ≤2HSD, and the actual product is 1.8HSD.
[0033] Step 2. Pouring: The new high-carbon graphite steel roller ring adopts a centrifugal three-layer composite casting process. By ad...
Embodiment 3
[0034][Example 3] The three-layer chemical composition of the new high-carbon graphite steel roll ring of the present invention is: outer chemical composition C: 2.50%; Si: 1.60%; Mn: 1.00%; Cr: 0.90%; Ni: 3.40%; Mo: 0.80%; V: 0.50%; Nb: 0.50%; P: 0.005%; S: 0.005%; Ba+Ca: 0.65%; Re: 0.30%; ; Mn: 0.80%; Cr: 0.40%; Ni: 0.40%; Mo: 0.25%; P: 0.010%; S: 0.010%; P: 0.017%; S: 0.018%. The balance is Fe and a small amount of residual elements.
[0035] When the new high-carbon graphite steel roll ring is cast, the casting temperature is 80°C of liquidus temperature.
[0036] The design value of the surface hardness of the new high carbon graphite steel roller ring is 65-75HSD, the actual product is 71.3HSD, the design value of the hardness drop from the surface of the roller ring to the groove bottom is ≤2HSD, and the actual product is 1.4HSD.
[0037] Step 2. Pouring: The new high-carbon graphite steel roll ring adopts a centrifugal three-layer composite casting process. By addin...
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