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A medium and low carbon steel wire rod with excellent deformation properties and its production method

A technology of deformation performance and production method, which is applied in the field of metallurgy, can solve problems such as part failure, and achieve the effects of less surface defects, easy spheroidization treatment, and high spheroidization level

Active Publication Date: 2019-05-17
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the cold deformation process of downstream customers, cracks caused by surface defects are often the main cause of component failure

Method used

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  • A medium and low carbon steel wire rod with excellent deformation properties and its production method
  • A medium and low carbon steel wire rod with excellent deformation properties and its production method
  • A medium and low carbon steel wire rod with excellent deformation properties and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The medium-low carbon steel wire rod with excellent deformability in this embodiment is SWRCH22A, the main chemical composition and mass percentage are: C: 0.20%, Mn: 0.80%, P: 60ppm, N: 30ppm, S: 20ppm.

[0044] Taking Φ16mm wire rod as an example, the production method includes billet opening, rolling, and cooling processes. The specific process steps are as follows:

[0045] (1) Billet opening process: After the billet is billeted, the billet is finished, and the finished billet has a defect depth of 0.1mm.

[0046] (2) Rolling process: During the rolling process, the amount of steel passing through the rolls is guaranteed to be 900 tons, and the wear in the rolling channel is strictly controlled.

[0047] (3) Cooling process: the surface cooling rate is 6°C / s.

[0048] The actual detected grain size is grade 9, the interlamellar spacing of pearlite is 1.5 μm, the depth of the detected surface defects is less than 50 μm, and the length does not exceed 2mm; the metal...

Embodiment 2

[0051] The medium-low carbon steel wire rod with excellent deformability in this embodiment is SWRCH18A, the main chemical composition and mass percentage are: C: 0.16%, Mn: 0.40%, P: 45ppm, N: 20ppm, S: 15ppm.

[0052] Taking Φ10mm wire rod as an example, the production method includes billet opening, rolling, and cooling processes. The specific process steps are as follows:

[0053] (1) Billet opening process: After the billet is billeted, the billet is finished, and the finished billet has a defect depth of 0.15 mm.

[0054] (2) Rolling process: During the rolling process, the amount of steel passing through the rolls is guaranteed to be 980 tons, and the wear in the rolling channel is strictly controlled.

[0055] (3) Cooling process: the surface cooling rate is 5°C / s.

[0056] The actual detected grain size is 8.5, the interlamellar spacing of pearlite is 2μm, the depth of the detected surface defects is less than 50μm, and the length does not exceed 2mm; the metallograp...

Embodiment 3

[0059] The medium and low carbon steel wire with excellent deformation performance in this example is SWRCH25k, the main chemical composition and mass percentage are: C: 0.25%, Mn: 0.70%, Si: 0.15%, P: 55ppm, N: 40ppm, S : 25ppm.

[0060] Taking Φ20mm wire rod as an example, the production method includes blanking, rolling, and cooling processes. The specific process steps are as follows:

[0061] (1) Billet opening process: After the billet is billeted, the billet is finished, and the finished billet has a defect depth of 0.05mm.

[0062] (2) Rolling process: During the rolling process, the amount of steel passing through the rolls is guaranteed to be 800 tons, and the wear in the rolling channel is strictly controlled.

[0063] (3) Cooling process: the surface cooling rate is 8°C / s.

[0064] The actual detected grain size is 10 grades, the interlamellar spacing of pearlite is 1.0μm, the depth of the detected surface defects is less than 50μm, and the length does not exceed...

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Abstract

The invention discloses a medium-low carbon steel wire with excellent deformation performance and a production method thereof. The medium-low carbon steel wire comprises the main chemical components of 0.15%-0.25% of C, 0.30%-1.50% of Mn, 0-0.20% of Si, no more than 80 ppm of P, no more than 30 ppm of S and no more than 40 ppm of N. The production method comprises the processes of cogging, rollingand cooling. Through the rolling technology, the grain size grade is improved, and the pearlite interlamellar spacing is reduced; through finishing of a billet, obvious defects on the surface of thebillet are avoided; and by optimizing the surface quality of a roller, the surface defect depth is decreased. The wire rolled through the production method is easy to spheroidize, high in spheroidizing grade, few in surface defect, wide in cold deformation adaptability and capable of meeting the cold forming requirement for the deformation amount of 92% or below.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a medium-low carbon steel wire rod with excellent deformability and a production method thereof. Background technique [0002] The general use of medium and low carbon steel wire rods is to make standard parts such as bolts and nuts and other special-shaped parts, which require good deformation properties. The spherical pearlite structure is considered to be the most suitable for cold deformation. Generally, medium and low carbon steels are hot-rolled into wire rods, which usually have a ferrite + pearlite structure, which needs to be spheroidized to obtain a spheroidized structure. [0003] At present, special-shaped parts and non-standard parts in auto parts have begun to be used in large quantities. Among them, some non-standard parts have very large cold deformation, even equivalent to 80-90% cold deformation. Such cold deformation has very strict requiremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C21D8/06
Inventor 王宁涛田新中张治广董庆阮士朋刘振民王利军李世琳张鹏孔令波
Owner XINGTAI IRON & STEEL
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