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Wire rod for cold heading and manufacturing method thereof

A manufacturing method and wire rod technology, applied in the field of cold heading wire rod and its manufacturing, can solve the problems of increased cost and decreased manufacturing efficiency

Active Publication Date: 2021-04-23
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the spheroidizing annealing heat treatment is performed, the cost increases and the manufacturing efficiency decreases

Method used

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  • Wire rod for cold heading and manufacturing method thereof
  • Wire rod for cold heading and manufacturing method thereof
  • Wire rod for cold heading and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] After the steel sheet with the composition of the following table 1 was heated at 1100°C for 3 hours, it was hot-rolled into The wire is manufactured. At this time, the finish rolling temperature was kept constant at 950° C. and the rolling ratio at 80%. Then, it was cooled to 850°C in the first cooling step (CR1) and coiled, and then cooled in the second cooling step (CR2), third cooling step (CR3), and fourth cooling step (CR4) to produce wire rods. The cooling implementation process is shown in Table 2 below.

[0082] [Table 1]

[0083]

[0084] [Table 2]

[0085]

[0086]

[0087] Then, 10%, 20%, and 30% of the drawing amount were applied to the cooled wire rods to prepare steel wires, and the cold forgeability was evaluated and shown in Table 3 below. For the evaluation of cold forgeability, after performing a compression test with a true strain of 0.85 on the notched compression sample, it was evaluated by whether or not cracks occurred, and those wi...

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Abstract

The present invention provides a wire rod for cold heading capable of ensuring excellent cold workability without spheroidizing annealing heat treatment, and a manufacturing method thereof. A wire rod for cold heading according to an embodiment of the present invention, which contains C: 0.01% to less than 0.15%, Si: 0.3% or less, Mn: 0.2% to 0.75%, P: 0.03% or less, by weight %. S: less than or equal to 0.03%, sol.Al: 0.01% to 0.05%, Cr: less than or equal to 0.5%, Ti: 0.005% to 0.05%, N: less than or equal to 0.01%, the balance of Fe and other impurities, and meet the following According to formula (1), the average grain size of ferrite surrounded by ferrite grain boundaries with crystal orientation difference greater than or equal to 15° is 15 μm to 40 μm, {(A / 4)+[(B×30) / (2A +40)]}×(C / 3)≥700...Formula (1) where A represents the average equivalent circle diameter (μm) of ferrite grain boundaries with a crystal orientation difference greater than or equal to 15°, and B represents the crystal orientation difference The area fraction (area %) of ferrite grain boundary grains greater than or equal to 15° relative to the whole ferrite phase, C represents the average hardness (Hv) of the ferrite phase.

Description

technical field [0001] The present invention relates to a wire rod for cold heading and a manufacturing method thereof. More specifically, the present invention relates to a wire rod for cold heading suitable for use as an automobile material or a material for machine parts and a method for producing the same. Background technique [0002] Ordinary wire rod products are made into final products through hot rolling, cold drawing, spheroidizing heat treatment, cold drawing, cold heading, rapid cooling and tempering of wire rods. [0003] Cold working methods are more productive than hot working methods or mechanical cutting methods, and are more effective in reducing heat treatment costs, so they are widely used as automotive materials and mechanical parts materials such as bolts and nuts. [0004] However, in order to manufacture machine parts by cold working, it is necessary to have low deformation resistance and excellent ductility during cold working. If the deformation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C22C38/28C21D8/06
CPCC21D8/065C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/14C22C38/28C21D8/06C21D2201/05
Inventor 文东俊闵世泓李基澔林炫辰
Owner 浦项股份有限公司