Title:
HIGH-STRENGTH STEEL WITH GOOD WEATHER RESISTANCE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/087833
Kind Code:
A1
Abstract:
Disclosed in the present invention is a type of steel. Apart from 90% or more by mass of Fe and inevitable impurities, the steel further contains the following chemical elements in percentages by mass: C: 0.22-0.33%, Si: 0.1-1.0%, Mn: 0.3-1.5%, Cr: 0.2-1.6%, Ni: 2.2-3.8%, Mo: 0.1-0.7%, Cu: 0.02-0.3%, Al: 0.01-0.045%, V: 0.01-0.25%, and N ≤ 0.013%. Further disclosed in the present invention is a method for manufacturing the steel, comprising: (1) smelting and casting; (2) forging or rolling, involving processing a casting blank to a finished product size by using a roll-in-one-heat process or roll-in-two-heat process; and (3) quenching and tempering, wherein the heating temperature of quenching is 860-1000ºC, the heat preservation time is 2-6 h, and water cooling is performed after quenching; and the tempering temperature is 400-600ºC, the heat preservation time is 1-4 h, and air cooling to room temperature is performed after tempering. The steel of the present invention has high strength, well matched toughness and plasticity and good weather resistance, thereby having good application prospects.
Inventors:
ZHAO SIXIN (CN)
WANG CHENGQUAN (CN)
WANG CHENGQUAN (CN)
Application Number:
PCT/CN2022/115498
Publication Date:
May 25, 2023
Filing Date:
August 29, 2022
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D8/02; C22C33/04; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/46
Domestic Patent References:
| WO2021169779A1 | 2021-09-02 |
Foreign References:
| CN114592153A | 2022-06-07 | |||
| CN109136737A | 2019-01-04 | |||
| CN113322409A | 2021-08-31 | |||
| CN112011727A | 2020-12-01 | |||
| CN109023119A | 2018-12-18 | |||
| CN103255341A | 2013-08-21 | |||
| KR101819380B1 | 2018-01-17 | |||
| JPH10265846A | 1998-10-06 |
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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