A kind of hot-rolled steel strip for railway vehicles with low yield ratio and production method thereof
A railway vehicle and low yield ratio technology, which is applied in the field of metallurgy, can solve the problems of low yield ratio, high production difficulty, and difficulty in guaranteeing performance indicators, so as to achieve low performance requirements and improve service life
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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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