Prehardening plastic die steel plate and manufacture method thereof
A technology of plastic mold steel and steel plate, which is applied in the field of pre-hardened plastic mold steel and steel plate and its manufacture, and can solve the problems affecting the quality of polishing and uneven surface hardness of steel plate
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Embodiment 1
[0022] The percentage by weight of the composition of this pre-hardened plastic mold steel steel plate embodiment is:
[0023] C 0.35%; Si 0.52; Mn 0.92; Cr 1.45; Mo 0.33;
[0024] P 0.012; S 0.003; Al 0.030; Ti 0.02; B 0.0025.
[0025] The rest is Fe and unavoidable impurities. The specification of the steel plate is 200×1000×4300mm, and the maximum hardness value minus the minimum hardness value on the surface of the steel plate is 20HB.
Embodiment 2
[0027] The percentage by weight of the composition of this pre-hardened plastic mold steel steel plate embodiment is:
[0028] C 0.32%; Si 0.30; Mn 0.65; Cr 1.74; Mo 0.37;
[0029] P 0.009; S 0.001; Al 0.040; Ti 0.015; B 0.0015.
[0030] The rest is Fe and unavoidable impurities. The specification of the steel plate is 200×1000×4300mm, and the maximum hardness value minus the minimum hardness value of the steel plate surface is 18HB.
Embodiment 3
[0032] The percentage by weight of the composition of this pre-hardened plastic mold steel steel plate embodiment is:
[0033] C 0.38%; Si 0.68; Mn 0.83; Cr 2.0; Mo 0.45;
[0034] P 0.015; S 0.001; Al 0.020; Ti 0.04; B 0.0038.
[0035] The rest is Fe and unavoidable impurities. The specification of the steel plate is 200×1000×4300mm, and the maximum hardness value minus the minimum hardness value of the steel plate surface is 15HB.
[0036] Steel plate manufacturing method embodiment one
[0037] What this embodiment made was the pre-hardened plastic mold steel steel plate of the above-mentioned embodiment, and the steps of this embodiment are as follows:
[0038] The first step of smelting
[0039] 60 tons of molten steel smelted by 50 tons of EBT (electric furnace) are sequentially smelted by 60 tons of LF (ladle refining) and 60 tons of VD (vacuum degassing).
[0040] C 0.35%; Si 0.52; Mn 0.92; Cr 1.74; Mo 0.37;
[0041] P 0.012; S 0.003; Al 0.036; Ti 0.02; B 0.0025. ...
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