Title:
MEDIUM-CARBON BORON-CONTAINING STEEL AND CONTROLLED ROLLING AND CONTROLLED COOLING METHOD FOR ON-LINE NORMALIZING TREATMENT
Document Type and Number:
WIPO Patent Application WO/2022/207009
Kind Code:
A1
Abstract:
The present invention provides a medium-carbon boron-containing steel. The chemical components of the medium-carbon boron-containing steel are as follows in mass percentage: 0.37-0.45% of C; 0.17-0.37% of Si; 0.60-0.90% of Mn; 0.020-0.060% of Al; 0.0008-0.0035% of B; 0.030-0.060% of Ti; P≤0.025%; S≤0.025%; Cr≤0.25%; Ni≤0.20%; Mo≤0.10%; Cu≤0.20%; and the remainder is Fe and inevitable impurities. The controlled rolling and controlled cooling method suitable for the on-line normalizing treatment of medium-carbon boron-containing steel sequentially comprises the following steps: heating, rough rolling, finishing rolling, cooling by passing through water, and cold bed slow cooling. The medium-carbon boron-containing steel can meet the requirements of having a hardness of 190-220 HBW, an actual grain size that is ≥7 grade, and a banded structure that is ≤2 grade.
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Inventors:
ZHANG NIAN (CN)
ZHENG WENCHAO (CN)
LING XIN (CN)
CHEN PING (CN)
HUANG GUOPIAO (CN)
HE YINGWU (CN)
ZHENG WENCHAO (CN)
LING XIN (CN)
CHEN PING (CN)
HUANG GUOPIAO (CN)
HE YINGWU (CN)
Application Number:
PCT/CN2022/092305
Publication Date:
October 06, 2022
Filing Date:
May 11, 2022
Export Citation:
Assignee:
DAYE SPECIAL STEEL CO LTD (CN)
International Classes:
C22C38/00; C21D8/06
Foreign References:
| CN113265584A | 2021-08-17 | |||
| CN109234508A | 2019-01-18 | |||
| CN101045238A | 2007-10-03 | |||
| CN101148737A | 2008-03-26 | |||
| FR2930609A1 | 2009-10-30 |
Attorney, Agent or Firm:
BEIJING WUZHOUYANGHE & PARTNERS (CN)
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