Heating method for pure-iron flat steel rolled by blooming mill

Abstract

The invention relates to the technical field of pressure processing and rolling, in particular to a heating method for pure-iron flat steel rolled by a blooming mill. Specifically, the heating methodcomprises the following steps: (1) heating the pure-iron flat steel to 690-710 DEG C and maintaining the pure-iron flat steel at the temperature for 1-2 h; (2) heating the pure-iron flat steel to 970-1030 DEG C and maintaining the pure-iron flat steel at the temperature for 2-3 h; and (3) continuing heating the pure-iron flat steel to 1250-1290 DEG C and maintaining the pure-iron flat steel at thetemperature for 2 h or more. The heating method in the invention prevents plastic cracking caused by rapid temperature drop at the corners of the pure-iron flat steel and interior-and-exterior temperature difference and effectively avoids the generation of angular cracks of the pure-iron flat steel.

Description

technical field [0001] The invention relates to the technical field of pressure processing and rolling, in particular to a heating method for rolling pure iron flat steel in a blooming mill. Background technique [0002] Corner cracks refer to the longitudinal cracks that occur at the four corners of the steel ingot surface. Generally, the depth is shallow and can be removed by finishing grinding. The corners of the steel ingot are usually subjected to the pulling force generated by the contraction of the steel shells on both sides. When the cooling strength of the corners is small and the strength of the steel shells at the corners is small, they cannot withstand the pulling force from both sides, and cracks will appear at the corners. . [0003] The production process of pure iron flat steel in TISCO is as follows: continuous casting slab→cutting→heating→rolling. The profile factory is responsible for the rolling of pure iron flat steel. The raw material for rolling pure...

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Problems solved by technology

The profile factory is responsible for the rolling of pure iron flat steel. The raw material for rolling pure iron flat steel in TISCO is mainly continuous casting slab, and the main equipment for rolling is a 1000mm roughing mill. Due to the good plasticity of pure iron flat steel, When the heating temperature is not suitable, a large number of cracks are likely to occur at the corners of the billet after preliminary rolling, resulting in waste products.

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