Title:
30CRMO HOT ROLLED STEEL SHEET/STRIP AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/052315
Kind Code:
A1
Abstract:
A 30CrMo hot rolled steel sheet/strip and a production method therefor, comprising the following components in percentage by weight: C: 0.24-0.34%; Si: 0.1-0.5%; Mn: 0.6-1.5%; P≤0.03%; S≤0.007%; Cr: 0.80-1.50%; Mo: 0.10-0.30%; N: 0.004-0.010%; optionally, B: 0.001-0.006%; Als<0.001%; total oxygen [O]T: 0.007-0.020%; one or two of Cu: 0.10-0.60% and Sn: 0.005-0.04%; Mn/S≥250; and the balance being Fe and inevitable impurities. In the present invention, residual elements such as Sn and Cu in scrap steel are fully used for smelting, and elements such as Mo, Cr, and N are selectively added; the alkalinity of slag, the type and melting point of inclusions in the steel, and the free oxygen content and the acid-soluble aluminum Als content in molten steel are controlled; a cast strip is obtained by using a twin-roll thin strip continuous casting process, and is then hot-rolled in-line into a steel strip. According to the present invention, "rolling in one-time heating" of a thin-gauge 30CrMo hot-rolled steel sheet/strip is realized, the production efficiency is greatly improved, and production costs are greatly reduced.
Inventors:
WU JIANCHUN (CN)
FANG YUAN (CN)
FANG YUAN (CN)
Application Number:
PCT/CN2020/115286
Publication Date:
March 25, 2021
Filing Date:
September 15, 2020
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; B22D11/06; C21D1/18; C21D8/02; C22C38/04; C22C38/20; C22C38/22
Foreign References:
| CN107419192A | 2017-12-01 | |||
| CN107419192A | 2017-12-01 | |||
| CN102345071A | 2012-02-08 | |||
| CN102345071A | 2012-02-08 | |||
| CN109797345A | 2019-05-24 | |||
| CN103667895A | 2014-03-26 | |||
| CN103667878A | 2014-03-26 | |||
| CN101684537A | 2010-03-31 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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