Low-yield-ratio hot-rolled steel strip for railway vehicle and production method thereof
A railway vehicle, low yield-strength ratio technology, applied in the metallurgical field, can solve the problems of high production difficulty, low yield-strength ratio, and difficult to guarantee performance indicators, and achieve the effect of improving service life and low performance requirements.
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Embodiment 1
[0020] The thickness of the hot-rolled steel strip Q345NQR2 for railway vehicles with low yield ratio in this embodiment is 12.0mm, and its chemical composition and mass percentage are shown in Table 1.
[0021] The production method of the hot-rolled steel strip Q345NQR2 for the low-yield-strength ratio railway vehicle of this embodiment includes slab continuous casting, hot continuous rolling, controlled cooling and controlled coiling procedures, and the specific process steps are as follows:
[0022] (1) Slab continuous casting: the thickness of the continuous casting slab is 150mm, and the chemical composition and mass percentage of the continuous casting slab are shown in Table 1;
[0023] (2) Continuous hot rolling: the rough rolling adopts a large reduction, the reduction rate is 76.5%, the thickness of the intermediate billet is 35.2mm; the exit temperature of the finish rolling is controlled at 840°C;
[0024] (3) Controlled cooling: Use the 36m-long laminar cooling s...
Embodiment 2
[0028] The thickness of the hot-rolled steel strip Q345NQR2 for railway vehicles with low yield ratio in this embodiment is 8.0 mm, and its chemical composition and mass percentage are shown in Table 1.
[0029] The production method of the hot-rolled steel strip Q345NQR2 for the low-yield-strength ratio railway vehicle of this embodiment includes slab continuous casting, hot continuous rolling, controlled cooling and controlled coiling procedures, and the specific process steps are as follows:
[0030] (1) Slab continuous casting: the thickness of the continuous casting slab is 150mm, and the chemical composition and mass percentage of the continuous casting slab are shown in Table 1;
[0031] (2) Continuous hot rolling: the rough rolling adopts a large reduction, the reduction rate is 76.7%, the thickness of the intermediate billet is 34.9mm; the exit temperature of the finish rolling is controlled at 852°C;
[0032] (3) Controlled cooling: Use the 36m-long laminar cooling s...
Embodiment 3
[0036] The thickness of the hot-rolled steel strip Q345NQR2 for railway vehicles with low yield ratio in this embodiment is 6.0 mm, and its chemical composition and mass percentage are shown in Table 1.
[0037] The production method of the hot-rolled steel strip Q345NQR2 for the low-yield-strength ratio railway vehicle of this embodiment includes slab continuous casting, hot continuous rolling, controlled cooling and controlled coiling procedures, and the specific process steps are as follows:
[0038] (1) Slab continuous casting: the thickness of the continuous casting slab is 150mm, and the chemical composition and mass percentage of the continuous casting slab are shown in Table 1;
[0039] (2) Continuous hot rolling: large reduction is adopted for rough rolling, the reduction rate is 76.4%, and the thickness of the intermediate billet is 35.4mm; the exit temperature of finish rolling is controlled at 861°C;
[0040] (3) Controlled cooling: Use the 36m-long laminar cooling...
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Abstract
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Application Information
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