Hot-rolling H-shaped steel containing and vanadium boride and having excellent low-temperature impacttoughness and preparation method of hot-rolling H-shaped steel
A low-temperature impact toughness, H-shaped steel technology, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of large fluctuations in impact absorption energy, low operability of steel properties, and low pass rate
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[0022] Example 1: Add boron and vanadium Q345 H steel, product specifications 700×300×13×24, the mass fraction of steel is as follows (%): C 0.16~0.18, Si 0.26~0.29, Mn 1.20~1.27, P 0.012~0.018, S 0.007~0.010, Ca 0.005~0.008, B 0.0012~0.0023, V 0~0.076, the remainder is Fe and trace impurities.
[0023] During the smelting process, control the mass percentage of gas in the shaped blank: [N]≤80 ppm, [O]≤100 ppm. According to the above smelting composition of Q345, the rolling process temperature is controlled as follows: heating temperature 1250~1280 ℃, billeting temperature 1180~1225 ℃, final rolling temperature 790~830 ℃. In the universal rolling process, the billet stays for 35 seconds, and the cumulative compression ratio is 60%.
[0024] The impact test uses Charpy V-shaped impact test specimens, and the length direction is along the longitudinal direction of the flange of the H-shaped steel product.
[0025] See the results of the experiment figure 1 . by figure 1 It can be s...
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[0028] Example 2: Q345 H-shaped steel with boron and vanadium added, product specifications 350×350×12×19, the mass fraction of steel is as follows (%): C 0.14~0.17, Si 0.25~0.30, Mn 1.31~1.39, P 0.01~0.018, S 0.005~0.010, Ca 0.005~0.008, B 0.0013~0.0022, V 0.035~0.05, the balance is Fe and trace impurities.
[0029] During the smelting process, control the mass percentage of gas in the shaped blank: [N]≤80 ppm, [O]≤100 ppm. According to the above smelting composition of Q345, the rolling process temperature control is as follows: heating temperature 1250~1280 ℃, billeting temperature 1180~1230 ℃, final rolling temperature 760~810 ℃. In the universal rolling process, the billet stays for 15-50 seconds, and the cumulative compression ratio is above 55%. The impact test uses Charpy V-shaped impact test specimens, and the length direction is along the longitudinal direction of the flange of the H-shaped steel product.
[0030] The experimental results are shown in Table 2. It ca...
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