Heavy and medium plate mill rough rolling and longitudinal rolling pass reduction distribution method

Abstract

The invention discloses a heavy and medium plate mill rough rolling and longitudinal rolling pass reduction distribution method and belongs to the technical field of heavy and medium plate production. The method is suitable for a billet with the specification ranging from 150 mm to 400 mm, the billet heating tapping temperature ranges from 1,140 DEG C to 1,220 DEG C, the specification of a steel plate ranges from 6 mm to 200 mm, the steel plate temperature-holding thickness multiple ranges from 1.5 to 4, the rough rolling and longitudinal rolling stage rolling reduction K slope is set to range from 0.9 to 1.2, and the maximum pass reduction is 40 mm; and the rolling force Fn of n rolling is worked out through a rough rolling and longitudinal rolling stage rolling reduction distribution calculation formula: K=Fn / Fn+1. The method has the beneficial effects that by means of input of simple rough rolling slope parameters, the distribution mode of the rough rolling and longitudinal rolling pass reduction can be flexibly adjusted according to product requirements, and heavy and medium plate rolling and various production modes are met better.

Description

technical field [0001] The invention belongs to the technical field of medium and heavy plate rolling, and in particular relates to a method for distributing reductions in rough rolling and longitudinal rolling passes of a medium and heavy plate rolling mill. Background technique [0002] In the production of medium and heavy plates, the billet undergoes several passes of rolling to produce plastic deformation, and finally rolled out qualified finished steel products. This series of rolling processes is carried out in accordance with the set rolling regulations. The rolling schedule of the plate mill is generally divided into two stages of rolling, namely the rough rolling stage and the finishing rolling stage. The rough rolling stage is rolling above the austenite recrystallization temperature (not less than 950°C), and the recrystallization and deformation are carried out alternately, which can refine the austenite grains. The finishing rolling stage is non-recrystallizat...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for allocating reductions in the rough rolling and longitudinal rolling passes of a medium and heavy plate mill, which solves the problem that the existing rough rolling pass distribution mode is difficult to meet the rolling needs of different medium and heavy steel plate varieties

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