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A method for manufacturing a light steel plate with ultra-high strength and high toughness

An ultra-high-strength, manufacturing method technology, applied in the field of metal materials, can solve the problems of reducing plasticity, brittle steel plate, low elongation and toughness, etc., to improve tensile strength and plasticity, delay crack propagation, and cold bending performance. perfect effect

Active Publication Date: 2019-12-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. A large amount of alloying elements Cr, Ni, and Mo are added to traditional ultra-high-strength martensitic and bainite steel plates. Segregation of alloying elements is prone to occur during the solidification of molten steel, which deteriorates performance and greatly increases production costs.
[0009] 2. The traditional ultra-high-strength toughness steel plate is martensite or bainite structure, which has high strength, but the elongation and toughness are relatively low, and it cannot meet the requirements of anti-ballistic performance while having high toughness
[0010] 3. For ultra-high strength and toughness steel plates, the carbon content is generally higher than 0.5%. Excessive carbon content will not only make the steel plate brittle, reduce its plasticity, but also make the welding performance worse

Method used

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  • A method for manufacturing a light steel plate with ultra-high strength and high toughness
  • A method for manufacturing a light steel plate with ultra-high strength and high toughness
  • A method for manufacturing a light steel plate with ultra-high strength and high toughness

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Embodiment 1

[0034] A method for manufacturing a light steel plate with ultra-high strength and high toughness. The chemical composition and weight percentage of the cast slab are:

[0035] C: 0.35%, Si: 1.35%, Al: 2.45%, Mn: 6.47%, V: 0.32%, Nb: 0.034%, B: 0.0021%, N≤0.003%, S≤0.005%, P≤0.015%, The balance is Fe and other unavoidable impurities.

[0036] The manufacturing method of the light steel plate with ultra-high strength and high toughness provided by the present invention comprises the following steps:

[0037] (1), smelting and casting: adopt the chemical composition percentage shown in embodiment 1 to take raw material, smelt by vacuum induction furnace and cast into steel ingot, hot forge into 50mm thick slab;

[0038] (2) Hot rolling: the hot-forged slab is solidified at 1150°C for 2 hours, the rolling temperature is 1100°C, rolled to a thickness of 5mm after 8-9 passes, the final rolling temperature is 800°C, and air-cooled to room temperature after rolling .

[0039] (3) Te...

Embodiment 2

[0041] A method for manufacturing a light-weight steel plate with ultra-high strength and high toughness, the chemical composition of the billet and its composition weight percentage:

[0042] C: 0.41%, Si: 1.67%, Al: 3.53%, Mn: 6.89%, V: 0.45%, Nb: 0.044%, B: 0.0035%, N≤0.003%, S≤0.005%, P≤0.015%, The balance is Fe and other unavoidable impurities.

[0043] The manufacturing method of the light steel plate with ultra-high strength and high toughness provided by the present invention comprises the following steps:

[0044] (1), smelting and casting: adopt the chemical composition percentage shown in embodiment 2 to take by weighing raw material, after smelting and casting into steel ingot by vacuum induction furnace, hot forge into 70mm thick slab;

[0045] (2) Hot rolling: the hot-forged slab is solidified at 1200°C for 2 hours, the rolling temperature is 1150°C, rolled to a thickness of 4.5mm after 7-8 passes, the final rolling temperature is 850°C, and air-cooled to room ...

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Abstract

A method for manufacturing a lightweight steel plate with ultrahigh strength and high toughness includes, in percent by weight: 0.30-0.45 wt % C, 1.0-2.0 wt % Si, 2.0-4.0 wt % Al, 6.0-7.0 wt % Mn, 0.30-0.50 wt % V, 0.02-0.05 wt % Nb, 0.001-0.005 wt % B, N≤0.003 wt %, P≤0.015 wt %, S≤0.005 wt %, Fe, and inevitable impurities.

Description

technical field [0001] The invention belongs to the field of metal materials. In particular, it relates to a method for manufacturing a light steel plate with ultra-high strength and high toughness. Background technique [0002] As a special-purpose alloy structural steel, ultra-high-strength toughness steel plate has both the commonality of alloy structural steel and the characteristics required for protective use. Ultra-high strength and toughness steel plates can be used in cash transport vehicles, escort vehicles, VIP vehicles, security doors, bank counter protection plates, safes, shields, helmets and other fields. Its performance requires high strength, high toughness and high hardness at the same time. High hardness and high strength can effectively resist the impact of bullets and prevent the steel plate from being penetrated by bullets; high toughness can absorb the kinetic energy of bullets to the maximum and prevent the steel plate from cracking or cracking. . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/04C22C38/12C22C38/32C21D8/02C22C38/44C22C38/52C22C38/50C22C38/42C22C38/54C22C38/34C22C38/58C22C38/48C22C38/46C22C38/38C22C38/24C22C38/26C22C38/22C22C38/30C22C38/20C22C38/28C22C38/10C22C38/08C22C38/16C22C38/14
CPCC21D6/005C21D6/008C21D8/0205C21D8/0226C21D9/46C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/001
Inventor 罗海文沈国慧
Owner UNIV OF SCI & TECH BEIJING