Method for reducing Cr and Mo steel mill bar frame-shaped segregation
A steel rolling and framing technology, applied in the field of framing segregation of Mo steel rolling materials and reducing Cr, can solve the problem that specific parameters or specific research methods for the control of framing segregation are not accurately given, so as to reduce the macroscopic The effect of frame segregation, reducing segregation and simplifying the annealing process
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Embodiment 1
[0032]The Φ15mm wire rod for high-strength bolts is produced by 325mm×280mm bloom continuous casting-billet opening-wire rolling process. The chemical composition of Cr and Mo steel used is: C: 0.33%, Si: 0.35%, Mn 0.90%, S: ≤0.030%, P ≤0.030%, Cr: 1.20%, Ni: ≤0.25%, Cu: ≤0.030, Mo: 0.30%, the balance is iron, a steel rolling frame with reduced Cr and Mo The method of shape segregation is carried out according to the following steps:
[0033] (1) The Cr and Mo steel billets with the above components are continuously cast. During the continuous casting process, the parameters of the billet continuous casting machine are set as follows: electromagnetic stirring intensity 200A, frequency 2.4Hz, total water volume in the secondary cooling zone 102.6L / min, wide surface cooling The total amount of water is controlled at 54.15L / min; the total amount of narrow surface cooling water is controlled at 48.45L / min; the specific water volume is 0.225L / kg, the degree of superheat is 20°C, an...
Embodiment 2
[0040] 325mm×280mm bloom continuous casting-blooming-wire rolling process is used to produce Φ8mm wire rod for high-strength bolts. The chemical composition of Cr and Mo steel used is: C: 0.38%, Si: 0.2%, Mn : 0.70%, S: ≤0.030%, P ≤0.030%, Cr: 0.90%, Ni: ≤0.25%, Cu: ≤0.030, Mo: 0.15%, the balance is iron, a kind of rolled steel with reduced Cr and Mo The method of frame segregation is carried out according to the following steps:
[0041] (1) Carry out continuous casting of Cr and Mo steel billets. During the continuous casting process, the parameters of the billet continuous casting machine are set as follows: electromagnetic stirring intensity 150A, frequency 2Hz, total water volume in the secondary cooling zone 107.3L / min, of which the total amount of cooling water in the inner arc Controlled at 27.55L / min, the total amount of outer arc cooling water is controlled at 29.05L / min, the total amount of narrow surface cooling water is controlled at 50.7L / min; min;
[0042] (2)...
Embodiment 3
[0046] The Φ11mm wire rod for high-strength bolts is produced by using 325mm×280mm bloom continuous casting-billet opening-wire rolling process. The chemical composition of Cr and Mo steel used is: C: 0.35%, Si: 0.15%, Mn : 0.60%, S: ≤0.030%, P ≤0.030%, Cr: 1.0%, Ni: ≤0.25%, Cu: ≤0.030, Mo: 0.2%, the balance is iron, a kind of rolled steel with reduced Cr and Mo The method of frame segregation is carried out according to the following steps:
[0047] (1) Carry out continuous casting of Cr and Mo steel billets. During the continuous casting process, the parameters of the billet continuous casting machine are set as follows: electromagnetic stirring intensity 250A, frequency 2.5Hz, total water volume in the secondary cooling zone 97.9L / min, total cooling water volume in the wide surface Control at 51.7L / min; the total amount of cooling water on the narrow surface is controlled at 46.2L / min; the specific water volume is 0.236L / kg, the degree of superheat is 25°C, and the casting ...
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