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Method for preparing high-strength and toughness martensitic steel through strip cast rolling and aging process

A tough martensitic steel, thin strip casting and rolling technology, applied in the preparation of high-strength toughness martensitic steel, economical maraging steel thin strip manufacturing field, can solve the problems of limited plasticity, hinder the application of steel, etc. The effect of short production process, cost reduction and high efficiency

Active Publication Date: 2018-08-03
大马士革(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thin strip of martensitic steel obtained by this process has high strength but limited plasticity, which hinders the further application of the steel in automotive structures

Method used

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  • Method for preparing high-strength and toughness martensitic steel through strip cast rolling and aging process
  • Method for preparing high-strength and toughness martensitic steel through strip cast rolling and aging process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment test adopts the chemical composition shown in Example 1 in Table 1, and the implementation steps are as follows:

[0035] (1) Hoist the molten steel with qualified composition to the ladle turret: hoist the maraging steel molten steel after refining the LF ladle to the ladle turret, and calm it down for 20 minutes.

[0036] (2) Molten steel is injected into the large tundish: the tundish is blown with argon for 15 minutes to drive out the air in the tundish, and then the molten steel is injected from the ladle into the tundish through the long nozzle, and the superheat is controlled at 40°C, and a covering agent is added on the surface of the molten steel for heat preservation and adsorption Inclusion.

[0037](3) Twin-roll casting and rolling: pour the molten steel from the tundish in step (2) into the lower tundish to supply molten steel to the twin-roll thin strip continuous casting machine, and pour the molten steel in the small tundish into t...

Embodiment 2

[0042] The present embodiment test adopts the chemical composition shown in embodiment 2 in table 1, and implementation steps are as follows:

[0043] (1) Hoist the molten steel with qualified composition to the ladle turret: hoist the maraging steel molten steel after refining the LF ladle to the ladle turret, and calm it down for 20 minutes.

[0044] (2) Molten steel is injected into the large tundish: the tundish is blown with argon for 20 minutes to drive out the air in the tundish, and then the molten steel is injected from the ladle into the tundish through the long nozzle, and the superheat is controlled at 60°C, and a covering agent is added on the surface of the molten steel for heat preservation and adsorption Inclusion.

[0045] (3) Twin-roll casting and rolling: pour the molten steel from the tundish in step (2) into the lower tundish to supply molten steel to the twin-roll thin strip continuous casting machine, and pour the molten steel in the small tundish into t...

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Abstract

The invention belongs to a method for preparing high-strength and toughness martensitic steel through strip cast rolling and aging process and belongs to the technical field of metallurgical engineering. The method comprises the specific steps: (1) smelting molten steel with qualified components and lifting the molten steel to a ladle turret; (2) injecting the molten steel into a specially designed tundish; (3) enabling the molten steel into a gap of double rolls to start freezing and performing cast rolling; (4) performing online hot rolling on the cast strip billet, cooling and cutting off the head and tail; (5) performing strip steel coiling; (6) performing aging treatment after uncoiling. According to the method disclosed by the invention, the technological process and production timecan be greatly shortened, the energy consumption is greatly reduced, and the production rate is improved. Compared with the conventional martensitic thin steel strips for automobiles, the high-strength and toughness martensitic steel disclosed by the invention has the advantages that the optimization design of micro-alloy components is combined with the rapid solidification characteristic of a thin strip cast rolling process, and due to subsequent aging treatment, the comprehensive mechanical properties of the martensitic steel are further improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical engineering, in particular to a method for preparing high-strength and tough martensitic steel through thin-strip casting and aging processes. More specifically, the present invention relates to a manufacturing method of an economical maraging steel thin strip with a tensile strength of 1200MPa to 2000MPa, a yield strength of 900MPa or more, and an elongation of 9-20%. Background technique [0002] Martensitic steel for automobiles is an important representative of advanced high-strength steel (AHSS). Its core strengthening mechanism lies in the martensitic lath structure. The corresponding tensile strength range is generally in the range of 1000-1500MPa, and it is mainly used for side impact of the vehicle body. Safety components such as protection and bumpers. At present, the production process of martensitic steel thin strip is generally that the cold-rolled coil is heated to the austeni...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/22C22C38/38C22C38/24C22C38/26C22C33/04C21D8/02
CPCC21D8/0226C21D2211/008C22C33/04C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/38
Inventor 罗海文温鹏宇刘浏
Owner 大马士革(北京)科技有限公司
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