A heating method for rolling pure iron flat steel in a blooming mill

A heating method and blooming mill technology, applied in the field of pressure processing and rolling, can solve the problems of billet corner cracks and scraps, and achieve the effect of preventing rapid temperature drop and avoiding edge and corner cracks.

Active Publication Date: 2020-03-10
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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  • A heating method for rolling pure iron flat steel in a blooming mill
  • A heating method for rolling pure iron flat steel in a blooming mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] YT2 pure iron flat steel is rolled on the 1000mm blooming mill of the profile factory. The raw material is 220mm*630mm to cut the continuous casting slab. The finished product specification after rolling is 110mm*215mm. Heat the pure iron flat steel in a soaking furnace to 690-710℃ for 1-2 hours, then heat the pure iron flat steel to 990-1010℃ for 2-3 hours, continue to heat the pure iron flat steel, The temperature is raised to 1260-1280°C, the billet is hoisted out of the heating furnace after holding for 2 hours, 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- At 1180℃, rolling can be carried out. After the end of production, the surface cracks of pure iron flat steel were counted. The surface quality of YT2 pure iron flat steel was improved, and the unplanned product rate caused by surface cracks was 3%.

Embodiment 2

[0053] YT2 pure iron flat steel is rolled on the 1000mm blooming mill of the profile factory. The raw material is 220mm*630mm to cut the continuous casting slab. 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 for 2-3 hours, and continue to heat the pure iron flat steel to increase the temperature To 1250-1270℃, after holding for 2 hours, the billet is hoisted from the heating furnace and 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℃ , Can be rolled. After the end of production, the surface cracks of the pure iron flat steel were counted. The surface quality of the YT2 pure iron flat steel was improved, and the unplanned product rate caused by the surface cracks was 4%.

Embodiment 3

[0055] DT4 pure iron flat steel is rolled by the 1000mm blooming mill of the profile factory. The raw material is 220mm*630mm to cut the continuous casting slab. The finished product specification after rolling is 110mm*215mm. Heat the pure iron flat steel in a soaking furnace to 700-710°C for 1-2 hours, then heat the pure iron flat steel to 1000-1030°C for 2 hours, and continue to heat the pure iron flat steel to heat up To 1260-1290℃, the billet is hoisted out of the heating furnace after holding for 4 hours, 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℃ , Can be rolled. After the end of production, the surface cracks of pure iron flat steel were counted. The surface quality of DT4 pure iron flat steel was improved, and the unplanned product rate caused by surface cracks was 4.5%.

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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 by a blooming mill. Background technique [0002] Corner cracks refer to the longitudinal cracks that occur on the four corners of the surface of the steel ingot, which are generally shallow in depth and can be removed by finishing and grinding. The corners of the steel ingots are usually subjected to the tensile force generated by the shrinkage of the steel shells on both sides. When the cooling strength of the corners is low and the strength of the steel shells of the corners is low, it cannot withstand the tensile force from both sides, and cracks will appear in the corners. . [0003] Taiyuan Iron and Steel's production process of pure iron flat steel is: continuous casting slab → cutting → heating → rolling forming. The profile factory is responsible for the rolling of pure iron flat steel. Taiyuan Iron and...

Claims

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Application Information

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Patent Type & Authority Patents(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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