Casting method for Q1100D ultrahigh-strength steel

A casting method and ultra-high-strength steel technology, applied in the field of continuous casting in the metallurgical industry, to achieve the effect of reducing center segregation, lightening center segregation, and enlarging equiaxed crystals in the center of the slab

Pending Publication Date: 2022-04-15
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no mention of improving the surface quality of ultra-high-strength steel plates from the perspective of casting machines and improving the control level of central segregation of ultra-high-strength steel billets.

Method used

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  • Casting method for Q1100D ultrahigh-strength steel
  • Casting method for Q1100D ultrahigh-strength steel
  • Casting method for Q1100D ultrahigh-strength steel

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Experimental program
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Effect test

Embodiment

[0033] The casting section is 2000×250.

[0034] Check the condition of the fan-shaped section before pouring. There is no water leakage in the fan-shaped section. If the nozzle is blocked, it must be replaced.

[0035] During casting, the Q1100D high-strength steel chemical composition and mass percentage of the present invention are as follows:

[0036] C: 0.16%, Si: 0.2%, Mn: 1.15%, P: 0.008%, S: 0.002%, Alt: 0.027%, Als: 0.025%, Nb: 0.025%, V: 0.055%, Ti: 0.02%, Cr: 0.25%, Mo: 0.6%, Ni: 0.35%, Ca: 0.0017%, B: 0.0015%, and the rest are Fe and unavoidable impurities.

[0037] The water flow rate of the crystallizer is 4300L / min, and the water volume of the narrow side is 370L / min. The water temperature of the crystallizer will fluctuate slightly, but it should be controlled at 35-38°C, so as to ensure that the heat flux in the crystallizer during casting is 1100-1200KW / m 2 , the heat flux in this range can ensure casting safety and no cracks.

[0038] Since the water temp...

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Abstract

The invention aims to provide a Q1100D ultrahigh-strength steel casting method, which mainly adopts technical measures from casting of a casting machine, avoids surface cracks of an ultrahigh-strength steel casting blank, improves the center segregation control level of the ultrahigh-strength steel casting blank, and achieves the purpose of ensuring that all performances of a steel plate rolled by the casting blank are qualified.

Description

technical field [0001] The invention relates to the technical field of continuous casting in the metallurgical industry, in particular to a casting method for Q1100D ultra-high-strength steel. Background technique [0002] With the continuous development of the machinery industry in the direction of large-scale and lightweight, more and more high-strength steel and ultra-high-strength steel have been used in large quantities. Ultra-high-strength steel with a yield strength of 1100MP is currently the highest-strength steel in the field of domestic construction machinery. It is mainly used for key components such as concrete pump trucks in the construction machinery industry, telescopic middle arms of truck cranes, bases and pull plates of crawler cranes, and large-tonnage hydraulic supports. Due to its special properties such as high yield strength and high flatness, it has been called the "hard bone" of high-strength steel by the domestic and foreign steel industry. At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D11/111B22D11/115B22D11/16B22D11/22C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 刘志国李鑫王宏盛李文艺丁晓志
Owner BAOTOU IRON & STEEL GRP
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