Title:
SINGLE-BILLET, MULTI-GRADE PRODUCTION METHOD FOR SERIES OF HIGH-GRADE GRADE E STEELS FOR WEATHER-RESISTANT BRIDGES
Document Type and Number:
WIPO Patent Application WO/2024/000669
Kind Code:
A1
Abstract:
A series of high-grade grade E steels used for weather-resistant bridges, and a single-billet, multi-grade production method therefor. The composition of the steel material in percentages by weight comprises: C: 0.05-0.07%, Si: 0.25-0.45%, Mn: 1.25-1.50%, P: 0.009-0.014%, S: ≤0.003%, Nb: 0.02-0.03%, Ti: 0.008-0.018%, Cu: 0.25-0.35%, Ni: 0.25-0.35%, Cr: 0.45-0.55%, Mo: 0.05-0.15%, Alt: 0.020-0.045%, and the remainder is Fe and impurities. The production method therefor comprises steps such as billet heating, first stage rolling, second stage rolling and heat treatment. A set of component designs is used to realize single-billet, multi-grade assembly production, which is beneficial for saving time and simplifying a production process.
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Inventors:
TANG CHUNXIA (CN)
QIAO MINGLIANG (CN)
WANG JUN (CN)
CUI QIANG (CN)
CHEN LINHENG (CN)
LIU TAO (CN)
QIN YURONG (CN)
MENG LINGMING (CN)
LI XINLIANG (CN)
QIAO MINGLIANG (CN)
WANG JUN (CN)
CUI QIANG (CN)
CHEN LINHENG (CN)
LIU TAO (CN)
QIN YURONG (CN)
MENG LINGMING (CN)
LI XINLIANG (CN)
Application Number:
PCT/CN2022/105737
Publication Date:
January 04, 2024
Filing Date:
July 14, 2022
Export Citation:
Assignee:
NANJING IRON & STEEL CO LTD (CN)
International Classes:
C22C38/02; B21B37/74; C21D8/02; C22C38/04
Foreign References:
| CN113846271A | 2021-12-28 | |||
| CN113201687A | 2021-08-03 | |||
| CN104264062A | 2015-01-07 | |||
| CN105063509A | 2015-11-18 | |||
| CN105779883A | 2016-07-20 | |||
| JP2001200334A | 2001-07-24 | |||
| CN114182165A | 2022-03-15 |
Attorney, Agent or Firm:
NANJING SUGAO PATENT AND TRADEMARK FIRM ( ORDINARY PARTNERSHIP ) (CN)
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