Title:
R6 HIGH TOUGHNESS OFFSHORE MOORING CHAIN STEEL APPLICABLE TO ANCHOR MOORED POSITIONING CATHODIC PROTECTION FLOATING BODY AND MOORING CHAIN THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/211137
Kind Code:
A1
Abstract:
The present invention relates to a kind of R6 high toughness offshore mooring chain steel applicable to anchor moored positioning cathodic protection floating body and a mooring chain thereof. The chemical elements comprise C 0.18~0.24%, N 0.006~0.024, P, S, Si, Mn, Cr, Ni, Mo, Cu, Al, Ti, V, Nb, Ca, O≤0.0015, H≤0.00015, Fe and impurity elements, wherein 0.22≤(C+N)≤0.26; the total quantity of alloy ∑M=(Si+Mn+Cr+Ni+Mo+Cu), 3.4≤∑M≤6.8; and the total quantity of microalloy ∑MM=(Ti+Al+Nb+V), 0.065≤∑MM≤0.194. Under the premise of maintaining the high toughness and low corrosion rate of the steel, the present invention adjusts the corrosion potential so as to avoid hydrogen evolution embrittlement caused by cathode over protection. According to the present invention, V is merely used for intensifying, thereby realizing the enhancement of N content in VCN; the chain quenching temperature is raised such that M3C, M2C and VCN in the steel melt sufficiently and are sufficiently precipitated during tempering, thereby improving the precipitation strengthening effect and offsetting the mechanical property weakening possibly caused by limiting the alloy content. Therefore, the present invention relates to composite bainite R6 chain steel and a chain having low crack sensitivity and small difference between superficial and internal structures and properties.
Inventors:
YIN JIANG (CN)
BAO XUEJUN (CN)
LIU ZHENWEI (CN)
BAI YUN (CN)
XU XIAOHONG (CN)
ZHANG MING (CN)
FAN HAIDONG (CN)
LI YAO (CN)
LI HONGLI (CN)
CHEN DE (CN)
ZHU GUORONG (CN)
HU GUOREN (CN)
YAO TIEHUA (CN)
GU QIUHAO (CN)
CUI YONG (CN)
HUANG ERXIN (CN)
LIU XUEWEN (CN)
LI LIANGLIANG (CN)
BAO XUEJUN (CN)
LIU ZHENWEI (CN)
BAI YUN (CN)
XU XIAOHONG (CN)
ZHANG MING (CN)
FAN HAIDONG (CN)
LI YAO (CN)
LI HONGLI (CN)
CHEN DE (CN)
ZHU GUORONG (CN)
HU GUOREN (CN)
YAO TIEHUA (CN)
GU QIUHAO (CN)
CUI YONG (CN)
HUANG ERXIN (CN)
LIU XUEWEN (CN)
LI LIANGLIANG (CN)
Application Number:
PCT/CN2019/087168
Publication Date:
October 22, 2020
Filing Date:
May 16, 2019
Export Citation:
Assignee:
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD (CN)
International Classes:
C22C38/02; C21D1/18; C21D8/06; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50
Foreign References:
| CN103667953A | 2014-03-26 | |||
| CN106636928A | 2017-05-10 | |||
| CN101519751A | 2009-09-02 | |||
| JPS54115618A | 1979-09-08 | |||
| CN103667953A | 2014-03-26 | |||
| CN101161843A | 2008-04-16 | |||
| CN201611001805A | 2016-11-12 | |||
| CN201810638000A | 2018-06-20 | |||
| CN106636928A | 2017-05-10 |
Other References:
See also references of EP 3812479A4
Attorney, Agent or Firm:
BEIJING WITAL PATENT AGENCY LTD (CN)
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