Title:
FABRICATION METHOD FOR 600 MPA-GRADE LARGE-SPECIFICATION HIGH-STRENGTH CORROSION-RESISTANT ANTI-SEISMIC REBAR
Document Type and Number:
WIPO Patent Application WO/2021/139489
Kind Code:
A1
Abstract:
A 600 MPa-grade large-specification high-strength corrosion-resistant anti-seismic rebar and a fabrication method therefor, the method comprising molten steel smelting, deoxidation and alloying, molten steel LF refining, molten steel casting, steel billet heating and steel billet controlled rolling/controlled cooling processes. In the present fabrication method, a certain amount of vanadium-containing pig iron is added to replace expensive vanadium alloy, thus increasing the vanadium content of the molten steel while reducing the amount of the vanadium alloy used. By adding a certain amount of chromium, the passivation and corrosion resistance of the steel are improved, the corrosion rate thus being only 1/2 that of ordinary 600 MPa-grade high-strength rebar. In addition, the hardenability and the secondary hardening effect are markedly improved, the pearlite content is increased, the tensile strength of the steel is improved, and the anti-seismic properties are improved. The present fabrication method has a low production cost, high process applicability and controllability, and other such characteristics. Rebar produced by means of the method has the advantage of having excellent and stable mechanical properties, a fine and uniform microstructure, good plasticity and toughness, and excellent corrosion resistance and anti-seismic properties.
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Inventors:
CHEN WEI (CN)
ZHANG WEIQIANG (CN)
DENG JIAMU (CN)
CAO JIANCHUN (CN)
HU WEI (CN)
LIU LINGANG (CN)
WANG WENFENG (CN)
ZHANG WEIQIANG (CN)
DENG JIAMU (CN)
CAO JIANCHUN (CN)
HU WEI (CN)
LIU LINGANG (CN)
WANG WENFENG (CN)
Application Number:
PCT/CN2020/136105
Publication Date:
July 15, 2021
Filing Date:
December 14, 2020
Export Citation:
Assignee:
WUGANG GROUP KUNMING IRON AND STEEL CO LTD (CN)
International Classes:
C22C38/02; C21C7/06; C21D8/08; C22C33/06; C22C38/04; C22C38/24
Foreign References:
| CN111004980A | 2020-04-14 | |||
| CN102383033A | 2012-03-21 | |||
| CN102796961A | 2012-11-28 | |||
| CN104372247A | 2015-02-25 | |||
| CN106086635A | 2016-11-09 | |||
| CN110343951A | 2019-10-18 | |||
| KR20120020479A | 2012-03-08 | |||
| JP2014043612A | 2014-03-13 |
Attorney, Agent or Firm:
GUANGZHOU RONDA INTELLECTUAL PROPERTY AGENCY (CN)
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