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A method of controlled rolling and controlled cooling for improving free-cutting steel wire rod sulfide morphology

A technology of controlled rolling and controlled cooling, steel wire rod, applied in the direction of metal rolling, temperature control, etc., can solve the problems of steel suffocation, achieve the effect of reducing quantity, reducing the accident rate of high-speed rolling mills, and reducing energy consumption

Active Publication Date: 2022-04-08
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In order to solve the problems in the background technology, the object of the present invention is to provide a controlled rolling and controlled cooling method for improving the sulfide form of free-cutting steel wire rods. The present invention chooses to heat and roll at a lower temperature, which can not only effectively avoid The hot-brittle temperature range of free-cutting steel wire rod solves the problem of steel holding due to splitting during the rolling process of free-cutting steel wire rod, ensures the normal rolling of free-cutting steel wire rod, and effectively inhibits the sulfide from rolling with the billet. The phenomenon of being elongated during the molding process effectively reduces the number of long strips of sulfide, improves the cutting efficiency of downstream users and the service life of cutting tools

Method used

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  • A method of controlled rolling and controlled cooling for improving free-cutting steel wire rod sulfide morphology
  • A method of controlled rolling and controlled cooling for improving free-cutting steel wire rod sulfide morphology
  • A method of controlled rolling and controlled cooling for improving free-cutting steel wire rod sulfide morphology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1. Billet heating:

[0060] Slab composition C: 0.08%, Si: 0.02%, Mn: 1.32%, P: 0.08%, S: 0.40%, Cr: 0.10%, Ni: 0.06%, Cu: 0.02%.

[0061] The continuous casting billet with a section of 160mm*160mm is heated at a temperature of 760-945°C for 3.8 hours, wherein the heating temperature of the preheating section is 760-845°C, the heating temperature of the heating section is 930-945°C, and the heating temperature of the soaking section is 870-900°C.

[0062] 2. Controlled rolling

[0063] The starting temperature of rough rolling is 837-850°C. The head of the rolled piece after rough rolling is heated by an online burner and then enters the middle rolling unit for rolling. The rolling temperature of the middle rolling unit is 832-841°C. After the rolling in the intermediate rolling group, the rolled pieces enter the pre-finishing rolling group for rolling, and the rolling temperature of the pre-finishing rolling group is 838-850°C. The rolled piece rolled by the pre-fin...

Embodiment 2

[0070] 1. Billet heating:

[0071] Slab composition C: 0.05%, Si: 0.07%, Mn: 1.18%, P: 0.05%, S: 0.35%, Cr: 0.07%, Ni: 0.03%, Cu: 0.03%.

[0072] The continuous casting billet with a section of 160mm*160mm is heated at 755-935°C for 3.2 hours, wherein the heating temperature of the preheating section is 761-828°C, the heating temperature of the heating section is 920-935°C, and the heating temperature of the soaking section is 860-896°C.

[0073] 2. Controlled rolling

[0074] The starting temperature of rough rolling is 831-841°C. The head of the rolled piece after rough rolling is heated by an online burner and then enters the middle rolling unit for rolling. The rolling temperature of the middle rolling unit is 830-839°C. After the rolling in the intermediate rolling group, the rolled pieces enter the pre-finishing rolling group for rolling, and the rolling temperature of the pre-finishing rolling group is 836-849°C. The rolled piece rolled by the pre-finishing rolling gr...

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Abstract

The invention belongs to the technical field of rolling, and relates to a controlled rolling and cooling method for improving the sulfide form of free-cutting steel wire rods. The steel billet is heated at a temperature not higher than 950°C for 3 to 4 hours; the rough rolling, finishing rolling, pre-finishing rolling, and finishing rolling units are rolled at a temperature not higher than 850°C; after rolling, the wire rod is laid out through a laying machine coiling; after spinning, the wire rod is controlled and cooled by the Stelmore cooling line. This process effectively avoids the hot-brittle temperature range of free-cutting steel wire rods, solves the problem of steel holding back caused by splitting during the rolling process of free-cutting steel wire rods, ensures the normal rolling of free-cutting steel wire rods, and suppresses the randomness of sulfides. The elongation of the steel billet during rolling and forming effectively reduces the number of long strips of sulfide, and improves the cutting efficiency of downstream users and the service life of cutting tools. At the same time, compared with the traditional high-temperature rolling process, the energy consumption is reduced, the service life of the rolled steel roll ring is improved, and the number of high-speed rolling mill accidents is reduced.

Description

technical field [0001] The invention belongs to the technical field of rolling, and relates to a controlled rolling and controlled cooling method for improving the form of sulfides in free-cutting steel wire rods. Free-cutting steel wire rod production process that improves tool life while reducing energy consumption. Background technique [0002] Free-cutting steel refers to the alloy steel that adds a certain amount of one or more than one kind of free-cutting elements such as sulfur, phosphorus, lead, calcium, selenium and tellurium to the steel to improve its machinability. With the automation, high speed and precision of cutting processing, it is very important to require good machinability of steel. This kind of steel is mainly used for processing on automatic cutting machine tools, so it is also a special steel. [0003] With the development of modern industry towards automation, high-speed and precision processing, steel is required to have good cutting process perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21B37/74C22C38/02C22C38/04C22C38/42C22C38/60
CPCB21B1/22B21B37/74C22C38/02C22C38/04C22C38/002C22C38/60C22C38/42B21B2001/225
Inventor 苏振伟周淼
Owner ZENITH STEEL GROUP CORP
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