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Rolling process of bismuth-containing free cutting steel

A technology of process and rolling temperature, applied in the field of rolling production process of free-cutting steel, to achieve the effects of reduced waste inspection, reduced failure time, and good organization

Active Publication Date: 2012-03-28
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 circular bismuth-containing free-cutting steel bar of φ22 mm is rolled.

[0027] Billet size: 150×150mm continuous casting billet, billet length 3m. Rolling is carried out by 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 into a continuous heating furnace for heating, and the heating temperature is controlled at 1150-1230°C, and the furnace enters the rolling process. Before entering the rough rolling unit, high-pressure water is used to descale the surface of the rolled piece, all the oxide scales on the surface of the billet are broken, and the surface oxide layer is removed. The pressure of the high-pressure water is 18-20MPa.

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

Embodiment 2

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

[0035] Billet size: 150×150mm continuous casting billet, billet length 3m. Rolling is carried out by 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 horizontally and vertically. The prepared bismuth-containing free-cutting steel continuous casting billet is sent into a continuous heating furnace for heating, and the heating temperature is controlled at 1150-1230°C, and then it is taken out of the furnace and enters the rolling process. Before entering the rough rolling, high-pressure water is used to descale the surface of the rolled piece, all the oxide scales on the surface of the billet are broken, and the surface oxide layer is removed. The pressure of the high-pressure water is 18-20MPa.

[0036] The rough rolling unit adopts the combina...

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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, belonging to the technical field of metallurgy. Background technique [0002] Free cutting steel (free cutting steel), referred to as free cutting steel. It is an alloy steel that adds a certain amount of one or more than one kind of easy-cutting elements such as sulfur, phosphorus, lead, calcium, selenium and tellurium to the steel to improve its cutting performance. With the improvement of global environmental protection awareness and the emphasis on environmental protection, the call for reducing the use of harmful substances such as heavy metal lead is getting higher and higher. It is inevitable to develop a new type of environmentally friendly free-cutting steel that meets the requirements of environmental protection and has excellent cutting performance. trend. Bismuth-containing free-cutting ...

Claims

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Application Information

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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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