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Bulletproof steel plate and manufacturing method thereof

A manufacturing method and technology for steel plates, applied in the field of steelmaking, can solve the problems of poor formability and welding performance, high price and high strength, and achieve the effects of good shape control, reduced smelting cost and low alloy content

Inactive Publication Date: 2019-08-02
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quenched and tempered steel sheets containing high chromium and nickel are generally used in China, but they have disadvantages such as high strength, poor formability and welding performance, and high price.

Method used

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  • Bulletproof steel plate and manufacturing method thereof
  • Bulletproof steel plate and manufacturing method thereof
  • Bulletproof steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Steelmaking

[0030] 1. Hot metal pretreatment process

[0031] Pretreatment into the furnace S≤0.005%, P≤0.010% scraping off slag; using fine material scrap.

[0032] 2. Converter process

[0033] The converter pulls carbon once and hits to avoid spot blowing; the ladle is purged with argon gas before tapping to control the tapping port and avoid scattered flow.

[0034] 3. Refining process

[0035] The LF+RH dual-path process is adopted, and the gas content is strictly controlled. It is required to maintain a slight positive pressure in the LF treatment process, strictly control the increase of N in LF, and the amount of N increase is required to be ≤10ppm; LF uses active lime and fluorite to make reducing slag with good fluidity, strictly controls the intensity of argon blowing, and avoids the exposure of molten steel as much as possible; uses silicon Calcium wire Calcium treatment, feed CaSi wire 500 meters, make the inclusions fully spheroidized, and improve...

Embodiment 2

[0048] The components, preparation conditions and strength parameters of five groups of steel plates manufactured according to the method described in Example 1 are as follows:

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Abstract

The invention belongs to the technical field of steel making, and particularly relates to a bulletproof steel plate and a manufacturing method thereof. The high strength and high toughness are reachedthrough quenching and tempering treatment, cover annealing is conducted after normal hot rolling for reducing the strength of a hot rolled coil, later unwinding and shaping are facilitated, and thenpressure quenching is conducted, so that a good plate shape is maintained. By adopting the bulletproof steel produced by the invention, the gaps of enterprises are filled, the variety of steel products is increased, the high finished product quality and yield rate are reached, and good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a bulletproof steel plate and a manufacturing method thereof. Background technique [0002] At present, bulletproof steel plates can be divided into two categories according to their production processes: one is hot-rolled steel plates, represented by Domax Protect (Defend) 250 and 300 from Swedish Steel AB (SSAB) in Sweden. , its processing performance, weldability and cold bending performance are good, its tensile strength is greater than 900 MPa, generally less than 1 000 MPa; the other type is heat-treated steel plate, represented by Domax500 from SSAB Company in Sweden, this type of steel plate is hot-rolled After heat treatment and quenching to meet the strength requirements, the strength is high, usually greater than 1500 MPa, but the processability, weldability and cold bending performance are far inferior to hot-rolled steel plates. [0003] With the sev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/54C21D8/02C21D1/26C21D1/74C21D1/18
CPCC21D1/18C21D1/26C21D1/74C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/54
Inventor 刘志璞苗隽赵迪闵洪刚周晏锋张城铭徐勇崔洪涛吴刚许学利
Owner BENGANG STEEL PLATES
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