Method for rolling large-size square steel by single machine frame without groove

Abstract

The invention discloses single frame non slot rolling large size square steel method. It adopts big delivery head two-high reversing blooming mill system. Each of blank side is repeatedly made into roller pressing underside and free spread side, processed reciprocating many passes non slot rolling by the horizontal mill to form finished product. It uses critical percent of reduction control method to control the size of the single and double drum ratio in the approved range, control width to height ratio to remove rolling off square. Thus the invention can reduce pass positioning, produce the large square steel product with high quality and flexible size by using non slot rolling technique.

Description

technical field [0001] The invention relates to iron and steel rolling technology, in particular to the rolling technology of square steel with a thickness of more than 400mm. Background technique [0002] At present, the conventional production methods of large square steel at home and abroad are: rolling, continuous casting of blooms or forging methods using rolls with grooves. [0003] Among them, the use of rolls with passes for rolling is a general technology. By turning different passes on the rolls and compiling rolling procedures, the billets are rolled back and forth in multiple passes in sequence. The general pass system is "Box - Square" series. When rolling with a pass, because the pass is overfilled, ears will appear on both sides of the rolled piece; if the upper and lower rolling grooves of the pass are not aligned, the cross-section of the rolled piece will be wrong. The rolled piece without groove can avoid various defects due to the pass shape. [0004] ...

AI Technical Summary

Problems solved by technology

[0014] Rolling square steel with rolls with passes requires complete pass configurations. If the pass configuration on the same roll is insufficient to roll square steel products that exceed the pass size, it will seriously affect the serialization of enterprise product specifications. Not conducive to participating in market competition

At the same time, according to the requirements of the conventional rolling process, new rolls must be purchased and produced after grooves are made on the new rolls. The utilization rate of the rolls is low and the cost is high.

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