HRB400E-F coiled reinforced bar fine grain rolling technology method

Abstract

The invention relates to the technical field of steel rolling, in particular to an HRB400E-F coiled reinforced bar fine grain rolling technology method. The HRB400E-F coiled reinforced bar fine grainrolling technology method comprises the following steps that step 1, the heating temperature of a billet in a heating furnace is controlled by means of sectional heating, so that the tapping temperature of the billet is controlled at 1050+ / -20 DEG C, and the temperature difference between the end face and the head and tail is equal to or smaller than 30 DEG C; step 2, water dipping tanks behind passing through pre-finishing rolling and finishing rolling mills are increased to control the temperature of the billet entering into the finishing rolling to 900 DEG C, the temperature before enteringa wire-drawing machine is 810 DEG C, and the temperature of the wire-drawing machine is 860 DEG C; step 3, the phase change cooling rate is increased through air cooling; and step 4, the speed of a conveying roll gang is controlled in sections, the conveying speed of the roll gang is increased gradually, the overlap positions of steel wire rods are pulled out gradually, the stacking density of wire coils is reduced, so that the cooling speed is balanced. According to the HRB400E-F coiled reinforced bar fine grain rolling technology method, the cost is greatly reduced under the premise of meeting the quality.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a HRB400E-F disc screw fine-grain rolling process. Background technique [0002] Since the implementation of the new national standard GB / T1499.2-2018 in November 2018, HRB400Φ8 coiled snails are strictly prohibited from the production of water-penetrating steel bars, and are produced by VN microalloying process. The demand for VN alloys has increased significantly, the price has increased rapidly, and the production cost has increased significantly. Increase, vanadium nitrogen in steel is controlled at 0.02%-0.03%, 0.35 kg of vanadium nitrogen alloy is added on average per ton of steel, vanadium nitrogen alloy is 500,000 yuan / ton, and the cost of ton steel increases by 175 yuan. Therefore, there is an urgent need to reduce or cancel the use of VN alloys while ensuring quality and meeting the requirements of the new national standard to reduce production costs. Contents o...

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Problems solved by technology

[0002] Since the implementation of the new national standard GB / T1499.2-2018 in November 2018, HRB400Φ8 coiled snails are strictly prohibited from the production of water-penetrating steel bars, and are produced by VN microalloying process. The demand for VN alloys has increased significantly, the price has increased rapidly, and the production cost has increased significantly. Increase, vanadium nitrogen in steel is controlled at 0.02%-0.03%, 0.35 kg of vanadium nitrogen alloy is added on average per ton of steel, vanadium nitrogen alloy is 500,000 yuan / ton, and the cost is increased by 175 yuan per ton of steel

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