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Title:
GRADIENT STEEL MATERIAL HAVING SURFACE LAYER WITH FERRITE AND INNER LAYER WITH FERRITE + PEARLITE AND MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2020/135691
Kind Code:
A1
Abstract:
Provided are a gradient steel material having a surface layer with ferrite and an inner layer with ferrite + pearlite, and a manufacturing method, the weight percentage of the components are: C≤0.15%, Si≤1%, Mn≤1.5%, the remaining are Fe and inevitable impurities, and the surface layer of the steel material is ferrite tissue, the inner layer is ferrite + pearlite tissue. The manufacturing method thereof includes: smelting, casting, rolling, heat treatment; wherein, in the heat treatment step, the steel material is heated above the austenite temperature Ac3, and the temperature is kept above 3 min to ensure that the material is completely austenitized; subsequently, it is cooled to a temperature below Ar1 at a cooling rate of less than 0.5°C/s. The steel material does not require to be compounded with two materials, and is only processed and prepared on a single material, the process is short, the procedure is simple, and the cost is low.

Inventors:
ZHANG SUOQUAN (CN)
JIAO SIHAI (CN)
DING JIANHUA (CN)
LIANG XIAOJUN (CN)
Application Number:
PCT/CN2019/129096
Publication Date:
July 02, 2020
Filing Date:
December 27, 2019
Export Citation:
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Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/00; C21D1/00; C21D8/00
Domestic Patent References:
WO2018110152A12018-06-21
Foreign References:
CN105908086A2016-08-31
CN105829561A2016-08-03
CN108138294A2018-06-08
CN201110045798A2011-02-25
CN201310211969A2013-05-31
CN201410707715A2014-11-28
CN201310212003A2013-05-31
CN201310213371A2013-05-31
CN201510173144A2015-04-13
CN201611223874A2016-12-27
CN201510621011A2015-09-25
CN201510173145A2015-04-13
CN201520878950U2015-11-06
CN201510738639A2015-11-03
CN201620972383U2016-08-30
CN201720527381U2017-05-12
CN201810506236A2018-05-19
CN201711015280A2017-10-25
Other References:
See also references of EP 3885461A4
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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