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Medium plate flexible rolling method
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A flexible rolling and final rolling technology, applied in the field of steel rolling, can solve the problems of large number of contract orders, many standards of medium and thick plates, and miscellaneous varieties, and achieve the effects of simplified billet inventory management, clear process management, and improved efficiency
Active Publication Date: 2010-12-22
SHOUGANG CORPORATION
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[0005] The purpose of the present invention is to provide a flexible rolling method for medium and heavy plates, which solves the problems of many standards, miscellaneous varieties, large number of contract orders and miscellaneous specifications, which is not conducive to large-scale organization of production and inventory management.
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Embodiment 1
[0026] Embodiment 1Nb series high-strength steel
[0027] The chemical composition of national standard Q370q series (14MnNbq) is C% 0.13-0.17, Mn% 1.30-1.50, Si% 0.20-0.50, Alt% 0.020-0.060, Nb% 0.015-0.050, the normal rolling process of 30mm steel plate is 2.5 times Temperature control, the final rolling temperature is lower than 830°C, the final cooling is 700°C, the cooling rate is 10K / s, the yield strength is 390-430Mpa, and the impact value can meet the requirements of -40°C (Grade E).
[0028] If the final rolling temperature is lowered to below 820°C, the final cooling is 650°C, the cooling rate is 12K / s, the yield strength can reach 410-450Mpa, the impact value can meet the requirements of -40°C (Class E), and the requirements of Q390 series.
[0029] Continue to adjust the process, the final cooling is 620°C, the cooling rate is 15K / s, and the yield is above 430Mpa, which can basically meet the requirements of the Q420 series.
Embodiment 2Q345
[0030] Embodiment 2 Q345 series Mn drop
[0031] The chemical composition of the traditional Q345 series (for medium and thick plates above 20mm), the main components are C% 0.14-0.18, Mn% 1.30-1.60, when rolling 30mm medium plates, the original process is final rolling 810-830 ℃, air cooling, yielding The strength is 340-370MPa. If the Mn content is reduced to about 1.10, the other chemical components remain unchanged, the temperature control thickness remains unchanged, by reducing the final rolling temperature to 800-820, and at the same time the final cooling temperature is controlled at 650°C and the cooling rate is 12K / s, the yield strength can reach 350 -380MPa, which meets the standard requirements. On the one hand, it is beneficial to reduce the cost of steel plate alloys. On the other hand, it can also reduce Mn segregation in the core by reducing Mn, and improve the quality of the core.
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Abstract
A medium plate flexible rolling method belongs to the technical field of steel rolling. The incoming billet 16MnR comprises the following components by weight percentage: 0.14-0.18% of C, 0.20-0.55% of Si, 1.30-1.40% of Mn, not more than 0.030% of P, not more than 0.015% of S, 0.020-0.060% of Alt and the rest is Fe; and microalloy components are adjusted according to steel grade. The 16MnR rolling process and cooling process are characterized in that the heating temperature is 1200-1240 DEG C, the stay time in furnace is 240-300 minutes, 2-2.5 fold temperature is controlled, the final rollingtemperature is 820-840 DEG C, and the final cooling temperature is 670-700 DEG C. The flexible rolling method has the advantage that the steel plates with different standard requirements and different strengths can be produced by adjusting the rolling process and the cooling process.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a flexible rolling method for medium and thick plates, which is suitable for low-alloy series varieties. Background technique [0002] In the production of medium and thick plates, there are many standards and various varieties. At present, there are more than 30 commonly used standards, and there are more than 10 grades under each standard. For example, according to the traditional steelmaking-medium plate management mode, the grades will reach more than 300 One, the management is cumbersome, and at the same time, the batches of a large number of contract orders are small, the specifications are miscellaneous, and the inventory cannot meet the requirements. In addition, a large number of orders cannot be formed into batches for production due to the small batch size. [0003] Traditional medium plate management mode: According to the performance and chemical c...
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