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Title:
FREE-CUTTING AND NON-QUENCHED AND TEMPERED STEEL, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/174530
Kind Code:
A1
Abstract:
Disclosed in the present invention are free-cutting and non-quenched and tempered steel and a manufacturing method therefor. The cracking and deterioration of mechanical properties of a rolled material caused by sulfide are mitigated by developing a proper heating schedule and rolling process without increasing production costs and energy consumption. The use of a three-stage heating method and measures such as increasing an initial rolling temperature and reducing a finishing rolling temperature not only effectively improves the crack resistance of the rolled material, but also enables various microalloying elements to dissolve in a steel matrix as much as possible to improve the mechanical properties of a product. Additionally, the use of measures such as water spray at a high-pressure, ring welding processing of an end part, air cooling on a cooling bed, and grinding of the rolled material surface further lowers the probability of cracking during rolling and improves the surface quality of the product. A free-cutting and non-quenched and tempered steel product produced using the rolling method provided in the present invention has a higher yield and better properties.

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Inventors:
ZHOU LEI (CN)
LIU LEI (CN)
FU JIANXUN (CN)
LIU WENXUE (CN)
DENG WEI (CN)
TIAN QIANREN (CN)
Application Number:
PCT/CN2021/096014
Publication Date:
August 25, 2022
Filing Date:
May 26, 2021
Export Citation:
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Assignee:
NANJING IRON & STEEL CO LTD (CN)
International Classes:
C22C38/02; B21C37/00; C21D6/00; C21D8/00; C22C38/04; C22C38/12; C22C38/60
Foreign References:
CN109234627A2019-01-18
JPH0925539A1997-01-28
US20180305798A12018-10-25
CN105154774A2015-12-16
CN101338398A2009-01-07
CN104152798A2014-11-19
CN110681698A2020-01-14
CN108246801A2018-07-06
CN105234170A2016-01-13
CN109207840A2019-01-15
Attorney, Agent or Firm:
NANJING SUGAO PATENT AND TRADEMARK FIRM ( ORDINARY PARTNERSHIP ) (CN)
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