Rolling process of bismuth-containing free cutting steel

A technology of process and process, applied in the field of rolling production process of easy-cut steel, to achieve good organization, avoid steel stamping accidents, excellent structure and mechanical properties

Active Publication Date: 2013-12-18
SHOUGANG GUIYANG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestic research on the rolling process of bismuth-containing free-cutting steel is still in a blank state

Method used

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  • Rolling process of bismuth-containing free cutting steel
  • Rolling process of bismuth-containing free cutting steel
  • Rolling process of bismuth-containing free cutting steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. In this embodiment, a round bismuth-containing free-cutting steel bar with a diameter of 22 mm is rolled.

[0027] Billet size: 150×150mm continuous casting billet, billet length 3m. Rolling is carried out through the rough rolling unit, the intermediate rolling unit, the pre-finishing rolling unit and the finishing rolling unit, and the entire continuous rolling unit is arranged alternately. The prepared bismuth-containing free-cutting steel continuous casting billet is sent to a continuous heating furnace for heating, and the heating temperature is controlled at 1150 to 1230°C, and it is discharged into the rolling process. Before entering the rough rolling mill, high-pressure water is used to descaling the surface of the rolling piece to break all the oxide scales on the surface of the billet and remove the surface oxide layer. The pressure of the high-pressure water is 18-20 MPa.

[0028] In order to achieve uniform deformation of free-cutting steel, the sta...

Embodiment 2

[0034] Example 2. In this embodiment, S29mm hexagonal free-cutting steel bars containing bismuth are rolled.

[0035] Billet size: 150×150mm continuous casting billet, billet length 3m. Rolling is carried out through the rough rolling unit, the intermediate rolling unit, the pre-finishing rolling unit and the finishing rolling unit, and the continuous rolling unit is arranged alternately. The prepared bismuth-containing free-cutting steel continuous casting billet is sent to a continuous heating furnace for heating, and the heating temperature is controlled at 1150-1230°C, and then it is discharged into the rolling process. Before entering the rough rolling, high-pressure water is used to descaling the surface of the rolling piece, all the oxide scale on the surface of the billet is broken, and the surface oxide layer is removed. The pressure of the high-pressure water is 18-20 MPa.

[0036] The rough rolling mill adopts a combination of box-square and rhombus-square pass systems...

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Abstract

The invention discloses a rolling process of bismuth-containing free cutting steel. The process comprises the following steps of: controlling the heating temperature at 1,150-1,230 DEG C; controlling the rolling temperature at 1,130-1,200 DEG C in a rough rolling step, wherein the standard material type size is used in each pass of rough rolling; controlling the rolling temperature at 1,000-1,060 DEG C in a medium rolling step, wherein the standard material size is used for rolling mill material types; controlling the rolling temperature at 900-950 DEG C in a pre-finish rolling step, wherein the standard material type size is used for rolling mill material types; controlling the rolling temperature at 930-980 DEG C in a finish rolling step, wherein the standard material type is used for rolling mill material types; and controlling the final rolling temperature at 810-830 DEG C. As the cooling water amount is controlled through process requirements and the deformation control temperature of each section is ensured in the rolling and deformation course, surface cracks and corner cracks generated in the rolling and deformation course and after deformation of a rolled piece can be prevented, a drawing steel accident caused by head splitting is avoided, the smooth rolling of the bismuth-containing free cutting steel is realized, the product surface quality is improved, medium wastes and inspection wastes are obviously reduced, the yield rate is greatly improved, and figured steel free cutting steel products, such as hexagonal steel, square steel, flat steel and the like can be directly produced through a caliber system.

Description

Technical field [0001] The invention relates to a rolling production process of free-cutting steel, in particular to a rolling process of bismuth-containing free-cutting steel, and belongs to the field of metallurgical technology. Background technique [0002] Free cutting steel, referred to as free cutting steel. It is an alloy steel in which a certain amount of one or more of sulfur, phosphorus, lead, calcium, selenium, tellurium and other free-cutting elements are added to the steel to improve its cutting performance. With the increasing awareness of global environmental protection and the importance of environmental protection, the demand for reducing the use of heavy metal lead and other harmful substances is increasing. It is inevitable to develop a new type of environmentally friendly free-cutting steel that meets environmental requirements and has excellent cutting performance. trend. Bismuth-containing free-cutting steel is a new type of environmentally friendly free-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/02B21B37/74
Inventor 刘厚权张波汪凌松伍林周英豪黄昌洪王翔吴少斌杨毅赵仕坤吴镇周海生杨接明丁楝姜凤程发兴
Owner SHOUGANG GUIYANG SPECIAL STEEL
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