Cold roll with thick quench-hardened layer and manufacturing method thereof
A manufacturing method and technology for cold rolling rolls, applied in the field of roll manufacturing, can solve the problems of additional round-trip transportation and re-quenching costs, increased roll turnover, high Cr alloy content, and achieve good metallurgical quality, high purity, and moderate grain size. Effect
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Embodiment 1
[0027] The manufacturing method of the cold roll with thick hardened layer of the present embodiment comprises the following steps,
[0028] 1) Prepare steel raw materials according to the chemical composition and weight percentage in the material of the cold roll, and prepare the roll blank according to the roll blank production process.
[0029] Specifically, steel raw materials are smelted in an electric arc furnace and LF / VD refining furnace, molded into electrode rods, annealed after demoulding, and then electroslag is remelted into electroslag ingots. The chemical composition and weight percentage of the ingot are tested. After the composition is qualified, the electroslag ingot is heated and forged into a forging billet. The forging billet is subjected to post-forging heat treatment, and finally turned to obtain a roll billet.
[0030] The annealing temperature of the electrode rod annealing treatment is 650°C, the annealing time is 15h, the heat treatment temperature a...
Embodiment 2
[0038] The cold rolling roll with thick hardened layer of the present embodiment, the weight percent composition of main chemical component in its material is through testing, and the content of main chemical component is shown in embodiment 2 column in table 1, and all the other are Fe and unavoidable impurities.
[0039] The manufacturing method of the cold rolling roll with thick hardened layer in this embodiment has similar process steps to that of embodiment 1, and the specific heat treatment parameters different from embodiment 1 are shown in column 2 of embodiment 2 in table 2.
[0040] After the above treatment, the cold rolling roll of this embodiment has a surface hardness of 95-96 HSD and a hardened layer thickness of 41 mm.
Embodiment 3
[0042] The cold rolling roll with thick hardened layer of the present embodiment, the weight percent composition of main chemical component in its material is through testing, and the content of main chemical component is shown in column 3 of embodiment in table 1, and all the other are Fe and unavoidable impurities.
[0043] The manufacturing method of the cold rolling roll with thick hardened layer in this embodiment has similar process steps to that of embodiment 1, and the specific heat treatment parameters different from embodiment 1 are shown in column 3 of embodiment 2 in table 2.
[0044] After the above treatment, the cold rolling roll of this embodiment has a surface hardness of 94-95 HSD and a hardened layer thickness of 43 mm.
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