Title:
HEAVY HOT-ROLLED H SECTION STEEL WITH Z-DIRECTION PERFORMANCE AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/005416
Kind Code:
A1
Abstract:
Disclosed in the present invention are heavy hot-rolled H section steel with Z-direction performance and a production method therefor. The hot-rolled H section steel comprises the following chemical components: C, Si, Mn, Nb, Ti, N, B, Als, and the balance of iron and inevitable impurities. The production method comprises the following steps: molten iron pretreatment→converter smelting→argon blowing refining→RH→full-protection pouring of a special-shaped blank→stacking for slow cooling→air cooling after rolling. In the present invention, by means of reasonable component proportioning and process control, the process of cogging rolling+universal rolling+air cooling after rolling, and the mode of combined phase change, precipitation and fine grain strengthening, the precipitation quantity of second-direction particles is regulated and controlled, and the content of obtained rolled granular bainite is between 10% and 20%, such that the heavy hot-rolled H section steel with the flange thickness of 80 mm or less has an excellent toughness and Z-direction performance, and the Z-direction performance is 65-80%.
Inventors:
SHEN QIANCHENG (CN)
WU BAOQIAO (CN)
WU MEIZHUANG (CN)
XING JUN (CN)
CHEN HUI (CN)
PENG LIN (CN)
WANG JIE (CN)
DING ZHAOHUI (CN)
HE JUNWEI (CN)
XIA MENG (CN)
HUANG QI (CN)
WU BAOQIAO (CN)
WU MEIZHUANG (CN)
XING JUN (CN)
CHEN HUI (CN)
PENG LIN (CN)
WANG JIE (CN)
DING ZHAOHUI (CN)
HE JUNWEI (CN)
XIA MENG (CN)
HUANG QI (CN)
Application Number:
PCT/CN2022/096620
Publication Date:
February 02, 2023
Filing Date:
June 01, 2022
Export Citation:
Assignee:
MAANSHAN IRON & STEEL CO LTD (CN)
International Classes:
B21B1/088; C22C38/02; B21B45/02; C21D8/00; C22C33/04; C22C38/04; C22C38/06; C22C38/12; C22C38/14
Foreign References:
| CN113564480A | 2021-10-29 | |||
| CN109715842A | 2019-05-03 | |||
| CN111455255A | 2020-07-28 | |||
| CN112030074A | 2020-12-04 | |||
| CN112410667A | 2021-02-26 | |||
| JP2016141834A | 2016-08-08 |
Attorney, Agent or Firm:
WUHU ANHUI INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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