Title:
EFFICIENTLY WELDED BRIDGE STEEL AND FABRICATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/227396
Kind Code:
A1
Abstract:
Disclosed are an efficiently welded bridge steel and a fabrication method therefor, which relate to the technical field of iron and steel production. The efficiently welded bridge steel comprises the following chemical components in mass percentage: C: 0.05％-0.08％; Si: 0.10％-0.30％; Mn: 1.10％-1.50％; P≤0.015％; S≤0.0050％; Nb: 0.020％-0.040％; V: 0.010％-0.040％; Ti: 0.006％-0.020％; Cr≤0.05％; Ni: 0.10％-0.30％; Mo≤0.05％; Cu≤0.05％; B≤0.0005％; Al: 0.025％-0.050％; Mg: 0.0010％-0.0030％; N≤0.0050％; Ca is not added, and the remainder is Fe and impurities. Finely dispersed inclusions having magnesium oxide, magnesium sulfide and magnesium aluminate spinel as nuclei are generated by means of metallurgical technology, and a TMCP rolling process and a normalizing treatment are used to obtain ferrite and a small number of pearlite structures having magnesium particles as nucleation conditions, so that the welding performance of bridge steel is improved.
Inventors:
WU JUNPING (CN)
Application Number:
PCT/CN2021/121053
Publication Date:
November 03, 2022
Filing Date:
September 27, 2021
Export Citation:
Assignee:
NANJING IRON & STEEL CO LTD (CN)
International Classes:
C22C38/02; C21C7/00; C21C7/10; C21D1/28; C21D8/02; C22C33/06; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50
Foreign References:
| CN113234999A | 2021-08-10 | |||
| CN109385576A | 2019-02-26 | |||
| CN108677096A | 2018-10-19 | |||
| JP2002003986A | 2002-01-09 | |||
| CN102080193A | 2011-06-01 | |||
| JPH11124652A | 1999-05-11 | |||
| JP2002047531A | 2002-02-15 | |||
| CN111440986A | 2020-07-24 | |||
| CN111020397A | 2020-04-17 |
Attorney, Agent or Firm:
NANJING LI&FENG INTELLECTUAL PROPERTY AGENCY (SPECIAL GENERAL PARTNERSHIP) (CN)
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