Cold heading steel with refined crystalline grains and production process thereof

A grain refinement and production process technology, applied in the field of metallurgy, can solve the problem of difficult to ensure the qualification of cold upsetting, and achieve the effect of grain refinement, prevention of TiN inclusion and uniform structure.

Active Publication Date: 2016-05-04
ZENITH STEEL GROUP CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] SWRCH35K is a kind of cold heading steel with wide application and high performance requirements. It is suitable for producing 8.8-10.9 high-strength bolts, nuts, flange bolts and hexagon socket bolts. In order to meet the requirements of use, SWRCH35K needs to have a high cold to

Method used

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  • Cold heading steel with refined crystalline grains and production process thereof

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Embodiment 1

[0039] Embodiment 1 of the present invention, reference example 2 SWRCH35K

[0040] (1) chemical composition is as follows table 1 (wt%):

[0041] Table 1

[0042]

[0043] (2) Grain size and cold upsetting performance are shown in Table 2:

[0044] Table 2

[0045] Grade grain size Cold Upsetting Properties SWRCH35K-Ti Grade 8-9 1 / 2 pass rate 100%; 1 / 3 pass rate 100% SWRCH35K Grade 7-8 1 / 2 pass rate 100%; 1 / 3 pass rate 16.7%

[0046] (3). Inclusions are as shown in Table 3:

[0047] table 3

[0048] Grade A rough A thin B thick B thin C thick C thin D thick D thin SWRCH35K-Ti 0.5 1.0 0.5 0 0 0 0 0 SWRCH35K 1.0 1.5 1.0 0.5 0 0 1 0.5

[0049] The results show that by adding Al and Ti elements, the material grains are refined, and the non-metallic inclusions are reduced, so that the cold upsetting performance is greatly improved.

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Abstract

The invention discloses cold heading steel with refined crystalline grains and a production process thereof. The cold heading steel comprises, by weight, 0.32-0.38% of C, 0.10-0.35% of Si, 0.60-0.90% of Mn, 0-0.20% of Cr, 0-0.030% of P, 0-0.035% of S, 0-0.20% of Ni, 0.010-0.040% of Al, 0.050-0.080% of Ti, 0-0.30% of Cu and the balance Fe and inevitable impurities. The production process of the cold heading steel comprises smelting, continuous casting and rolling. According to the cold heading steel with the refined crystalline grains and the production process thereof, the elements of the Al and the Ti are added, so that the material crystalline grains are refined, and the structure is more uniform; meanwhile, reasonable timing for using the Al and adding the Ti is chosen, then molten steel deoxidizing is strengthened, and finally the cold heading property of the cold heading steel is greatly improved by improving the purity of molten steel and the grain size of the material.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a grain-refined cold heading steel and a production process thereof. Background technique [0002] Due to its excellent cold forming performance, cold heading steel materials have adopted cold drawing technology in the machining industry to replace the traditional cold cutting technology of hot rolled materials. The main advantages of this new technology are: saving a lot of man-hours and improving production efficiency At the same time, it can save a lot of energy, thereby reducing environmental pollution; in addition, the metal consumption rate of materials can be reduced by about 20%, which meets the requirements of clean production and resource-saving enterprise production; and the obtained products have relatively high dimensional accuracy. The surface finish is good, and it is a rapidly developing machining process that has emerged in recent years. The fastener products produced by ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/08C22C38/16C22C38/14C22C38/06C22C33/04B22D1/00C21C7/06
CPCB22D1/00C21C7/0006C21C7/06C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14C22C38/16C22C38/18Y02P10/20
Inventor 邓向阳沈艳杜佳美刘宪民
Owner ZENITH STEEL GROUP CORP
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