Title:
STEEL FOR COLD FORGING UNIVERSAL JOINT FORK OF PASSENGER VEHICLE, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/148492
Kind Code:
A1
Abstract:
A steel for cold forging a universal joint fork of a passenger vehicle, and a manufacturing method therefor. Chemical components of the steel by mass % include: C: 0.04-0.10%, Si: 0.01-0.12%, Mn: 0.40-0.60%, P: ≤ 0.015%, S: 0.020-0.035%, Cr: ≤ 0.10%, Ni: ≤ 0.10%, Cu: ≤ 0.10%, Mo: ≤ 0.02%, Al: 0.020-0.050%, N: 0.007-0.009%, and the rest are Fe and unavoidable impurity elements. The structure of the steel is ferrite and pearlite, wherein the spheroidization rate of the pearlite is greater than or equal to 85%. The production process route comprises: molten iron pre-treatment; converter primary refining; refining; continuous casting; continuous casting billet cooling; continuous casting billet heating; rolling; cooling; spheroidizing annealing; and edge trimming. Taking a bar of Φ20mm-Φ40mm as an example, the surface hardness ≤ 110HV30; Rp ≤ 0.2 ≤ 280MPa, Rm ≤ 360MPa, elongation A5 ≥ 40%, and section shrinkage Z ≥ 75%. The product has excellent plasticity and low deformation resistance, and is an ideal steel for cold forging.
Inventors:
ZHANG LEI (CN)
BAI YUN (CN)
LUO YUANDONG (CN)
WU XIAOLIN (CN)
LI BING (CN)
TANG MINHAO (CN)
SUN YIFAN (CN)
GU PAN (CN)
ZHU HEPING (CN)
LIU WEN (CN)
BAI YUN (CN)
LUO YUANDONG (CN)
WU XIAOLIN (CN)
LI BING (CN)
TANG MINHAO (CN)
SUN YIFAN (CN)
GU PAN (CN)
ZHU HEPING (CN)
LIU WEN (CN)
Application Number:
PCT/CN2022/076389
Publication Date:
July 14, 2022
Filing Date:
February 16, 2022
Export Citation:
Assignee:
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD (CN)
International Classes:
C22C38/02; C22C38/04; C22C38/06
Domestic Patent References:
| WO2007074986A1 | 2007-07-05 |
Foreign References:
| CN112853211A | 2021-05-28 | |||
| CN104204263A | 2014-12-10 | |||
| CN1947928A | 2007-04-18 | |||
| CN106661684A | 2017-05-10 | |||
| JP2014031525A | 2014-02-20 | |||
| US20150329932A1 | 2015-11-19 | |||
| JP2000336460A | 2000-12-05 |
Attorney, Agent or Firm:
JIANGYIN QING ZHOU PATENT AGENCY (GENERAL PARTNERSHIP) (CN)
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