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Cu-containing microalloy high-strength and high-ductility steel and production method thereof

A high-toughness steel and high-strength technology, applied in the field of micro-alloyed steel preparation, can solve the problems of large fluctuations in low-temperature impact properties, increased production costs, and increased difficulty in steel surface quality control, and achieves the effect of reducing content requirements and saving production costs.

Active Publication Date: 2017-04-05
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Nb not only effectively improves the performance, but also increases the production cost, and the difficulty of controlling the surface quality of the steel is greatly increased. More importantly, the low-alloy high-strength steel containing Nb is prone to harmful microbeads during subsequent heat treatment. structure, low temperature impact performance fluctuates greatly and poor stability

Method used

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  • Cu-containing microalloy high-strength and high-ductility steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Adopt the process route of EAF-CONVERTER electric converter smelting→LF furnace refining→VD vacuum treatment→CCM continuous casting to produce Cu-containing micro-alloy high-strength and high-toughness steel,

[0025] Smelting finished product composition control: C: 0.13%, Si: 0.36%, Mn: 1.50%, P: ≤0.010%, S: ≤0.010%, Cr: 0.19%, Cu: 0.25%, Ni: 0.12%, V: 0.09 %, Ti: 0.03%, Al: 0.028%, the balance is Fe,

[0026] The electric converter uses molten iron, pig iron and high-quality steel scrap as raw materials. The total charge is controlled at 100.5 tons, the ratio of molten iron is 93%, the amount of pig iron added is 2.5 tons, and the rest is high-quality steel scrap. %, tapping temperature T: 1634°C, tapping volume 85.9 tons, eccentric bottom tapping and steel retention operation, strictly prohibiting tapping and slag; adding appropriate amount of Al blocks and calcium carbide for deoxidation during tapping, adding low carbon after furnace Ferromanganese, ferrosilicon,...

Embodiment 2

[0034]Adopt the process route of EAF-CONVERTER electric converter smelting→LF furnace refining→VD vacuum treatment→CCM continuous casting to produce Cu-containing micro-alloy high-strength and high-toughness steel,

[0035] Smelting finished product composition control: C: 0.14%, Si: 0.40%, Mn: 1.36%, P: ≤0.010%, S: ≤0.010%, Cr: 0.23%, Cu: 0.26%, Ni: 0.12%, V: 0.12 %, Ti: 0.025%, Al: 0.032%, the balance is Fe,

[0036] The electric converter uses molten iron, pig iron and high-quality steel scrap as raw materials. The total charge is controlled at 102.12 tons, the molten iron ratio is 91%, the pig iron addition is 4.3 tons, and the rest is high-quality steel scrap. The composition of the tapping end point is C: 0.04%, P: 0.005 %, tapping temperature T: 1638°C, tapping volume 87.2 tons, eccentric bottom tapping and steel retention operation, strictly prohibiting tapping and slag; adding appropriate amount of Al block and calcium carbide for deoxidation during tapping, adding lo...

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Abstract

The invention belongs to the field of microalloy steel preparation, and particularly relates to Cu-containing microalloy high-strength and high-ductility steel and production method thereof. The microalloy high-strength and high-ductility steel comprises the following components: 0.10-0.18% of of C, 0.25-0.50% of Si, 1.00-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, less than or equal to 0.30% of Cr, less than or equal to 0.50% of Cu, less than or equal to 0.50% of Ni, less than or equal to 0.20% of V, 0.02-0.20% of Ti, more than or equal to 0.015% of Al, and the balance of Fe. No-Nb composition design is realized, the content of Ni in the steel is effectively reduced, the high-ductility function of microalloy is fully utilized, and the comprehensive mechanical performance of the steel is remarkably improved.

Description

technical field [0001] The invention belongs to the field of micro-alloy steel preparation, in particular to a Cu-containing micro-alloy high-strength high-toughness steel and a production method thereof. Background technique [0002] Due to its strong formability and good welding performance, micro-alloyed high-strength steel has been widely used as an important material for structural purposes, especially the micro-alloyed high-strength steel with a yield strength above 500Mpa is particularly widely used. At the same time, In recent years, with the rapid development of transportation, construction, engineering machinery and other industries, the toughness and plasticity of the micro-alloyed high-strength steel used have also put forward higher and higher requirements. [0003] In order to improve the comprehensive mechanical properties of microalloyed steels, adding Nb to steel is a very common method at present. However, the addition of Nb not only effectively improves t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/14C22C38/06C22C38/12C22C38/16C22C38/08C22C38/28C22C38/20C22C38/38C22C38/24C22C38/50C22C38/44C22C38/46C22C38/58C21D8/00
CPCC21D8/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/20C22C38/24C22C38/28C22C38/38C22C38/44C22C38/46C22C38/50C22C38/58
Inventor 高宇波朱富强万文华
Owner ZENITH STEEL GROUP CORP
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