Method for employing large cross-section continuous casting round billet to roll round steel bar

Abstract

The invention belongs to the field of iron steel processing and particularly relates to a method for employing large cross-section continuous casting round billet to roll a round steel bar. The method for employing the large cross-section continuous casting round billet to roll the round steel bar comprises the following steps: 1) clamping plates arranged on pushing beds are adopted to align the large cross-section continuous casting round billet with a rolling trough; the large cross-section continuous casting round billet is sent to a rough mill for rolling, so as to produce intermediate billet; from the third rolling pass of the rough mill, steel turning is carried out once in each odd-numbered pass ; 2) the intermediate billet is sent to finishing mills for rolling with 4-6 pressing passes, so as to produce finished round steel bar; the diameter Phi of the finished round steel bar is in a scope that is larger than or equal to 120 mm and is less than or equal to 150 mm; the rolling pass of the rough mill is the eleventh pass; the rolling passes of the finishing mills are 4-6 passes; or the diameter Phi of the finished round steel bar is in a scope that is larger than or equal to 160 mm and is less than or equal to 280 mm; the rolling pass of the rough mill is the thirteenth pass; the rolling passes of the finishing mills are 4-6 passes. The method for employing the large cross-section continuous casting round billet to roll round steel bar has the advantages of shallow-slot large rolling reduction cogging, high rolling efficiency, low rolling cost and energy conservation. The method for employing the large cross-section continuous casting round billet to roll round steel bar has an outstanding advantage that under equal specification, the reduction ratio of the finished round steel bar is large and the quality is good.

Description

technical field [0001] The invention belongs to the field of iron and steel processing. Specifically, the invention relates to a method for rolling round steel with a large-section continuous casting round billet, in particular to a method for rolling large-size round steel by cooperating with a rough rolling mill and a finishing mill. Background technique [0002] At present, round steel is a kind of steel widely used in the machinery manufacturing industry. According to the classification of the billets used, there are three types of existing production processes: one is to use die-casting ingots, the other is to use continuous casting blooms, and the third is to use continuous casting. Cast round billet. Due to the limitation of the strength of the stand, the maximum size of the large round steel rolled by the general finishing mill is within φ200mm. Even a small number of finishing mills that can roll large-size round steel use relatively small billets, which cannot meet...

AI Technical Summary

Problems solved by technology

Due to the limitation of the strength of the stand, the maximum size of the large round steel rolled by the general finishing mill is within φ200mm. Even a small number of finishing mills that can roll large-size round steel use relatively small billets, which cannot meet the requirements of high compression ratio rolling. system, and basically square billet or rectangular billet

The disadvantages of rolling round steel with square billet or rectangular billet are: (1) The corners of the billet are cooled quickly, and edge cracks are easily produced during rolling, especially when the carbon content and alloy content are high; ( 2) The corners of the billet are cooled quickly, and the pass wear is heavy during rolling; (3) The heating temperature of the billet is uneven, which affects the quality of the finished steel

[0003] Some manufacturers use the method of forging to produce large round steel, but the production method of forging has low production efficiency and high cost

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