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A kind of protective steel and its preparation method

A technology of mass fraction and holding time, which is applied in the field of protective steel production to achieve the effects of high hardness, good toughness, good strength and shaping

Active Publication Date: 2022-06-21
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bulletproof steel plate disclosed in this patent document adopts the hot stamping forming process, which is not suitable for the production of thick gauge protective steel plate

Method used

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  • A kind of protective steel and its preparation method
  • A kind of protective steel and its preparation method
  • A kind of protective steel and its preparation method

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Experimental program
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Effect test

Embodiment 1-8

[0066] Embodiment 1-8 provides a kind of protective steel and preparation method thereof, and the concrete steps are as follows:

[0067] 1. After the molten steel is smelted and refined in a converter, the slab is obtained by continuous casting; the content of harmful elements such as P, S, and O is strictly controlled during the smelting process. The chemical composition of the slab is shown in Table 1, and the rest are iron and inevitable impurities.

[0068] 2. Put the billet into the heating furnace for heating, and control the heating temperature and holding time.

[0069] 3. Put the cast slab heated in step 2 into a rolling mill for rough rolling and finishing rolling, and control the rough rolling and finishing rolling temperatures to obtain a hot-rolled sheet of target thickness.

[0070] 4. Cool the hot-rolled sheet obtained in step 3, perform laminar cooling in a post-cooling mode, and coil the cooled hot-rolled sheet to obtain a steel coil;

[0071] 5. The steel ...

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Abstract

The invention provides a steel for protection and a preparation method thereof. The steel for protection is composed of the following chemical components in mass fractions: carbon: 0.46-0.55%; silicon: 1.70-2.00%; manganese: 0.20-0.80%; aluminum : 0.015‑0.060%; phosphorus ≤ 0.012%; sulfur ≤ 0.004%; nickel 3.6‑4.4%; chromium: 1.10‑1.60%; molybdenum: 0.70‑0.90%; Niobium: 0.025‑0.045%, the rest is iron and unavoidable impurities. The protective steel produced by the method of the present invention has a tensile strength (Rm) of 2120-2230MPa, an elongation of 8.5-10.5%, and good strength and shape; the impact energy at 40°C is 14-34J at 180° The cold bending is qualified and the toughness is good; the Brinell hardness is 601‑615HBW, which is high in hardness; in the target test, it is all breakdown, with ultra-high protection performance, meeting the requirements of high-level protection standards such as NATO and the European Union.

Description

technical field [0001] The invention belongs to the technical field of protective steel production, in particular to a protective steel and a preparation method thereof. Background technique [0002] Protective steel can be used to manufacture protective equipment, protective vehicles, protective structures, etc. In the field of steel plate protection, with the continuous improvement of equipment and technical capabilities of iron and steel production enterprises, the grade of protective steel plates that can be produced is also continuously improved. The prior art 2000MPa protective steel plate has been reported; the technology of producing thin gauge protective steel by press quenching forming process has also been reported. [0003] Chinese Patent 201510539848.6 discloses a bulletproof steel plate with a tensile strength of 2000 MPa and a manufacturing method thereof. The chemical element mass percentage ratios are: C: 0.35-0.45%; Si: 0.80-1.60%; Mn: 0.3-1.0%; Al: 0.02-0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/34C22C38/44C22C38/46C22C38/48C22C38/54C21D1/18C21D6/00C21D8/02
CPCC22C38/34C22C38/04C22C38/06C22C38/44C22C38/46C22C38/54C22C38/48C21D1/18C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0221C21D8/0247C21D2211/008C21D2211/001
Inventor 潘辉郭佳孟杨董现春王松涛朱国森刘锟章军李飞郭慧敏张旭
Owner SHOUGANG CORPORATION