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Bulletproof steel plate for C-class banknote transport vehicle and preparation method thereof

The technology of bulletproof steel plate and money transporter is applied in the field of steel plate production, which can solve the problems of unfavorable steel plate surface quality control, unmentioned toughness index, and high carbon content of bulletproof steel, so as to increase the difficulty of welding, improve the quality of casting billet, and improve the quality of the steel billet. The effect of purity

Inactive Publication Date: 2017-10-31
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this invention is that the welding performance is poor due to the high carbon equivalent; the high content of Cr, Mo, and Ni is easy to cause segregation; the elongation of the steel plate is low, and it is not easy to bend and stamp
[0005] CN100359034C discloses "a 1000MPa grade high-strength hot-rolled bulletproof steel plate and its manufacturing method", its composition is (weight percentage): C 0.17-0.21%, Si 1.5-2.2%, Mn 1.5-2.0%, P≤0.035% , S≤0.010%, Al 0.015-0.060%, N≤0.0060%, Nb 0.010-0.050%, Ti0.010-0.060%, Ca≤0.0050% can be added, and the tensile strength is greater than 1000MPa produced by hot rolling process In this invention, high silicon and high manganese are designed to ensure the strength of the steel plate. Although the manufacturing cost is low, the content of P and S harmful elements is high, which will easily cause the brittleness of the steel plate and is not conducive to the ballistic performance. In addition, due to silicon The high content is not conducive to the control of the surface quality of the steel plate, such as the surface defects of the steel plate surface such as pitting and iron oxide scale
The bulletproof steel described in this patent document has a very high carbon content and contains a variety of alloying elements. It is not easy to match welding consumables and has a high cost, and the toughness index of this steel is not mentioned

Method used

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  • Bulletproof steel plate for C-class banknote transport vehicle and preparation method thereof
  • Bulletproof steel plate for C-class banknote transport vehicle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Bulletproof steel plate for Class C cash transport vehicle with a thickness of 5mm.

[0023] The smelting chemical composition of the steel plate is: C: 0.22%; Si: 0.12%; Mn: 1.05%; P: 0.006%; S: 0.002%; Alt: 0.025%; Cr: 0.33%; Mo: 0.11%; Ti: 0.018%; [O]: 5ppm; [N]: 8ppm; [H]: 1ppm; the rest is Fe and unavoidable impurities.

[0024] The specific key steps and key parameters for preparing the above-mentioned steel plates are as follows:

[0025](1) Rough rolling in 4-roller roughing mill, number of rolling passes: 4, intermediate billet thickness: 30mm, average reduction speed 32mm / s;

[0026] (2) 4-high finishing mill finishing rolling, rolling time: 2.4min, number of rolling passes: 4, average reduction speed: 42mm / s;

[0027] (3) Vacuum quenching, vacuum degree: 0.5×10 5 Pa, heating temperature: 875°C, heating time: 22min, water cooling cooling rate: 44°C / s;

[0028] (4) Stress relief annealing, annealing temperature: 300°C, holding time: 15min, cooling rate: 1.2...

Embodiment 2

[0031] Bulletproof steel plate for Class C cash transport vehicle with a thickness of 6mm.

[0032] The smelting chemical composition of the steel plate is: C: 0.23%; Si: 0.16%; Mn: 1.20%; P: 0.007%; S: 0.003%; Alt: 0.028%; Cr: 0.26%; Mo: 0.15%; Ti: 0.022%; [O]: 6ppm; [N]: 10ppm; [H]: 2ppm; the rest is Fe and unavoidable impurities.

[0033] The specific key steps and key parameters for preparing the above-mentioned steel plates are as follows:

[0034] (1) Rough rolling in 4-roller roughing mill, number of rolling passes: 5, intermediate billet thickness: 30mm, average reduction speed 35mm / s;

[0035] (2) 4-high finishing mill finishing rolling, rolling time: 2.0min, number of rolling passes: 3, average reduction speed: 45mm / s;

[0036] (3) Vacuum quenching, vacuum degree: 0.7×10 5 Pa, heating temperature: 885°C, heating time: 20min, water cooling cooling rate: 41°C / s;

[0037] (4) Stress relief annealing, annealing temperature: 315°C, holding time: 13min, cooling rate: 1...

Embodiment 3

[0040] Bulletproof steel plate for Class C cash transport vehicle with a thickness of 7mm.

[0041] The smelting chemical composition of the steel plate is: C: 0.22%; Si: 0.20%; Mn: 1.15%; P: 0.005%; S: 0.001%; ​​Alt: 0.022%; Cr: 0.29%; Mo: 0.11%; Ti: 0.020%; [O]: 5ppm; [N]: 5ppm; [H]: 1ppm; the rest is Fe and unavoidable impurities.

[0042] The specific key steps and key parameters for preparing the above-mentioned steel plates are as follows:

[0043] (1) Rough rolling in 4-roller roughing mill, number of rolling passes: 5, intermediate billet thickness: 30mm, average reduction speed 32mm / s;

[0044] (2) 4-high finishing mill for finishing rolling, rolling time: 2.5min, number of rolling passes: 4, average reduction speed: 41mm / s;

[0045] (3) Vacuum quenching, vacuum degree: 0.6×10 5 Pa, heating temperature: 890°C, heating time: 17min, water cooling cooling rate: 43°C / s;

[0046] (4) Stress relief annealing, annealing temperature: 295°C, holding time: 15min, cooling ra...

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Abstract

The invention belongs to the technical field of armor plate production and particularly relates to an armor plate for a C-level securicar and a preparation method thereof. In the armor plate for the C-level securicar, the armor plate smelting chemical composition comprises the following components in percentage by weight: 0.22-0.24% of C, 0.12-0.20% of Si, 1.02-1.20% of Mn, less than or equal to 0.007% of P, less than or equal to 0.003% of S, 0.020-0.030% of Alt, 0.25-0.35% of Cr, 0.10-0.15% of Mo, 0.015-0.025% of Ti, less than or equal to 10ppm of [O], less than equal to 12ppm of [N], less than or equal to 2ppm of [H] and the balance of Fe and unavoidable impurities. The armor plate has excellent bulletproof property, relatively high purity and good shape and facilitates welding.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and in particular relates to a bulletproof steel plate for a C-class cash transport vehicle and a preparation method thereof. Background technique [0002] Cash transport vehicle is a vehicle used to transport cash, gold and silver, jewelry, securities, important vouchers and other important items in the financial and security service industries. With the progress of society and the rapid development of economy, it has been widely used. Bulletproofing is one of its most critical functions. According to the Public Security Industry Standard of the People's Republic of China GA164-2005 "Protective Technical Conditions for Special Cash Transport Vehicles", cash transport vehicles are divided into three levels from low to high according to their bulletproof and riot resistance capabilities. The bulletproof ability of the cockpit and box body of the banknote car should meet the require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C22C38/12C22C38/14C21D1/18C21D1/773C21D1/30C21D8/02
CPCC21D1/18C21D1/30C21D1/773C21D8/0205C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18
Inventor 侯登义周兰聚冯勇蒋善玉贾希光侯东华杨瑞霞
Owner SHANDONG IRON & STEEL CO LTD