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Cold heading steel, ladle furnace refining process of cold heading steel and production process of cold heading steel

A ladle furnace refining and production process technology, which is applied in the field of iron and steel smelting, can solve the problem that cold heading steel cannot meet the normal temperature processing performance and mechanical performance at the same time, and achieve the effects of good machinability, reduced silicon content, and high cleanliness

Inactive Publication Date: 2017-04-05
NEW FOUNDER HLDG DEV LLC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to overcome the technical defect that the cold heading steel produced by electric furnace smelting in the prior art cannot meet the normal temperature processing performance and mechanical performance at the same time, so as to provide a kind of steel that can meet the normal temperature processing performance and mechanical performance at the same time. cold heading steel
[0006] Another technical problem to be solved by the present invention is to overcome the technical defect that the cold heading steel produced by electric furnace smelting cannot meet the normal temperature processing performance and mechanical performance at the same time in the prior art, so as to provide a method that can match the electric furnace smelting process, and then The ladle furnace refining process of cold heading steel to improve the normal temperature processability and mechanical performance of cold heading steel through the regulation of process and composition
[0007] Another technical problem to be solved by the present invention is to overcome the technical defect that the cold heading steel produced by electric furnace smelting in the prior art cannot meet the normal temperature processability and mechanical performance at the same time, so as to provide a method that can match the electric furnace smelting process, and then The production process of cold heading steel to improve the normal temperature processability and mechanical performance of cold heading steel through the regulation of process and composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a ladle furnace refining process for the production of cold heading steel. In the early stage of the ladle furnace refining process, aluminum is used for deep deoxidation. For acid-soluble aluminum requirements, the amount of aluminum added at one time is 150-200kg, and the total aluminum content at the end point is guaranteed to be above 0.02%. Ferroalloy is added after adding aluminum at one time to prevent slag from being tapped.

[0040] By adding the amount of aluminum at one time, the deep deoxidation of molten steel in the ladle furnace can be realized to meet the requirements of cleanliness, and the shape and distribution of inclusions can also be improved; moreover, adding aluminum to the ladle furnace at one time can reduce the furnace temperature. The silicon content in the inner molten steel, so that the silicon content is controlled within the range of ≦0.10%, is conducive to improving the machinability of the final cold heading stee...

Embodiment 2

[0046] This embodiment provides a cold heading steel production process using the ladle furnace refining process described in Embodiment 1. The cold heading steel production process also includes an electric furnace smelting step before the ladle furnace refining step and a Continuous casting step after furnace refining.

[0047] The electric furnace is a 100-ton electric furnace, and the electric furnace smelting process specifically includes a batching step, a first feeding step, an electrification step, and a second feeding step. in,

[0048] In the batching step, add 15 tons of molten iron into the 100-ton electric furnace, and then add the amount of scrap steel according to the amount of molten iron added, and the copper content in the scrap steel is 0.22%.

[0049] Carry out charging for the first time after described batching step, add the mixture of scrap steel and pig iron of 50 tons in described 100 tons electric furnace.

[0050] Start to energize the electric fur...

Embodiment 3

[0062] This embodiment provides a cold heading steel production process using the ladle furnace refining process described in Embodiment 1. The cold heading steel production process also includes an electric furnace smelting step before the ladle furnace refining step and a Continuous casting step after furnace refining.

[0063] The electric furnace is a 100-ton electric furnace, and the electric furnace smelting process specifically includes a batching step, a first feeding step, an electrification step, and a second feeding step. in,

[0064] In the batching step, 45 tons of molten iron is added to the 100-ton electric furnace, and then the amount of steel scrap is added according to the amount of molten iron added. The content of copper in the steel scrap is 0.20%.

[0065] Carry out charging for the first time after described batching step, add 40 tons of steel scraps in described 100 tons electric furnace.

[0066] Start to energize the electric furnace after the first...

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Abstract

The present invention provides a cold heading steel, a cold heading steel ladle furnace refining process and a cold heading steel production process. The cold heading steel comprises the following chemical components by weight: 0.19-0.22% of C, less than or equal to 0.10% of Si, 0.75-0.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.030% of S, more than or equal to 0.02% of AlT, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.20% of Cu, and the balance of Fe. According to the present invention, in the cold heading steel production process, application of aluminum to carry out deep deoxidation, silicon calcium wire feeding, immersion type nozzle application and other steps are adopted, such that the internal components of the produced cold heading steel are reasonably matched, and especially the combination of the C with the content of 0.19-0.22% and the Si with the content of less than or equal to 0.10% makes the cold heading steel meet strength, toughness and other comprehensive mechanical properties, such that the workability of the cold heading steel at a room temperature is good.

Description

technical field [0001] The invention relates to a cold heading steel, a ladle furnace refining process and a production process of the cold heading steel, and belongs to the technical field of iron and steel smelting. Background technique [0002] Cold heading steels are generally low and medium carbon high-quality carbon structural steels and high-quality alloy structural steels, which are used for cold heading forming various mechanical standard parts and fasteners. Cold heading steel metal has good plasticity, and is mostly used to produce standard parts with high interchangeability, such as bolts, nuts, screws, rivets, self-tapping screws and other fasteners and cold heading forming parts. With the extensive use of fasteners, the market demand for cold heading steel continues to increase. The current demand for cold heading steel in my country alone has reached more than 10 million tons. [0003] The key to cold heading steel smelting is to improve the purity of molten ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C21C5/52
CPCB22D11/111C21C5/5211C21C7/06C22C38/02C22C38/04C22C38/42Y02P10/20
Inventor 张灏平沈晨曦
Owner NEW FOUNDER HLDG DEV LLC
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