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

A heating method and rough rolling mill technology, applied in the field of pressure processing and rolling, can solve problems such as waste products, billet corner cracks, etc., and achieve the effect of preventing rapid temperature drop and avoiding corner cracks

Active Publication Date: 2019-01-15
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]The 1000mm preliminary rolling mill of the profile factory rolls YT2 pure iron flat steel. The raw material is 220mm*630mm and the continuous casting slab is cut. The finished product specification after rolling is 110mm*215mm. Heat the pure iron flat steel in a soaking furnace to 690-710°C for 1-2 hours, then heat the pure iron flat steel to 990-1010°C, keep it for 2-3 hours, and continue to heat the pure iron flat steel to make Its temperature is raised to 1260-1280°C, after 2 hours of heat preservation, the steel billet is lifted out of the heating furnace, and is transported to the roller table of the rolling mill for rolling. Before rolling, the surface temperature of the pure iron flat steel is detected. When the billet temperature is 1150- Rolling can be carried out at 1180°C. After the production is finished, statistics are made on the cracks on the surface of the pure iron flat steel. The surface quality of the YT2 pure iron flat steel is improved, and the rate ...

Embodiment 2

[0053] The 1000mm preliminary rolling mill of the profile factory rolls YT2 pure iron flat steel. The raw material is 220mm*630mm and the continuous casting slab is cut. The finished product specification after rolling is 110mm*215mm. Heat the pure iron flat steel in a soaking furnace to 690-700°C for 1 hour, then heat the pure iron flat steel to 970-1000°C, keep it for 2-3 hours, and continue to heat the pure iron flat steel to raise the temperature to 1250-1270°C, after 2 hours of heat preservation, the steel billet is lifted out of the heating furnace, transported to the roller table of the rolling mill for rolling, and the surface temperature of the pure iron flat steel is detected before rolling, when the temperature is 1150-1180°C , can be rolled. After the production is finished, statistics are made on the cracks on the surface of the pure iron flat steel. The surface quality of the YT2 pure iron flat steel is improved, and the rate of unplanned products caused by surfa...

Embodiment 3

[0055] The 1000mm preliminary rolling mill of the profile factory rolls DT4 pure iron flat steel. The raw material is 220mm*630mm cutting continuous casting slab, and the finished product specification after rolling is 110mm*215mm. Heat the pure iron flat steel in a soaking furnace to 700-710°C and keep it warm for 1-2 hours, then heat the pure iron flat steel to 1000-1030°C, keep it warm for 2 hours, and continue to heat the pure iron flat steel to raise the temperature to 1260-1290°C, after 4 hours of heat preservation, the steel billet is lifted out of the heating furnace, and is transported to the roller table of the rolling mill for rolling. Before rolling, the surface temperature of the pure iron flat steel is detected. When the temperature is 1150-1180°C , can be rolled. After the production is finished, the surface cracks of the pure iron flat steel are counted. The surface quality of the DT4 pure iron flat steel is improved, and the rate of unplanned products caused b...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/54C21D9/70
CPCC21D9/54C21D9/70
Inventor 乔小梅许立伟王俊平郑壮
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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