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Micro-alloying compound cored wire for high-strength steel

A micro-alloying, high-strength steel technology, applied in the field of cored wire, can solve the problems of center segregation, low isotropic performance, etc. The effect of grain refinement

Inactive Publication Date: 2013-04-10
HUBEI KMK WELDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-strength micro-alloyed composite cored wire, which is mainly aimed at technical problems such as central segregation, low transverse impact performance, and low isotropic performance in the current high-strength steel smelting slab.

Method used

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  • Micro-alloying compound cored wire for high-strength steel
  • Micro-alloying compound cored wire for high-strength steel
  • Micro-alloying compound cored wire for high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The particle size of the powdery particles in the powdery inner core of the cored wire is 1-1.2 mm, and the powdery inner core is covered with a carbon steel sheath to make a cored wire with a diameter of 13 mm. Among them, the carbon steel outer skin adopts 08Al steel strip with a thickness of 0.3-0.4 mm, and the element composition and quality in the powdery inner core are: Ca 22%, Si 51%, Mg0.65%, Ba 2.5%, Re 0.6 %, B 1.2%, Zr 1.6%, Ti.2.8%, Nb 0.6%, and the balance is iron and unavoidable impurities.

Embodiment 2

[0021] Example 2: The particle size of the powdery particles in the powdery inner core of the cored wire is 1.2-1.5 mm, and the powdery inner core is covered with a carbon steel sheath to make a cored wire with a diameter of 13 mm. Wherein the carbon steel outer skin adopts a low-carbon steel strip with a thickness of 0.3-0.4 mm, and the element components and mass % in the powdery inner core are: Ca 28%, Si 55%, Mg 1.5%, Ba 1.3%, Re 1.0%, B 0.6%, Zr 3.5%, Ti 1.3%, Nb 1.2%, and the balance is iron and unavoidable impurities.

Embodiment 3

[0022] Example 3: The particle size of the powdery particles in the powdery inner core of the cored wire is 1-1.5 mm, and the powdery inner core is covered with a carbon steel sheath to make a cored wire with a diameter of 13 mm. Wherein the carbon steel outer skin adopts 08Al steel strip with a thickness of 0.3-0.4 mm, and the element components and mass % in the powdery inner core are: Ca 25%, Si 53%, Mg 1.0%, Ba 2.0%, Re 0.8 %, B 0.8%, Zr 2.0%, Ti 2.0%, Nb 0.8%, and the balance is iron and unavoidable impurities.

[0023] In order to further verify the effects of the present invention, the inventors conducted the following performance tests, and the results are as follows.

[0024] 1. Using the cored wire obtained in Example 3, add 2 kilograms of powdered inner core per ton of molten steel (KD type high-strength steel, Rm≥800MPa, impact toughness CV=250-300J, -20°C) cored wire. Then the slag samples before and after adding the cored wire were analyzed, and the results are...

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Abstract

The invention relates to a micro-alloying compound cored wire for high-strength steel, comprising a carbon steel sheath and a powdery core, wherein the core is prepared from the following chemical components by weight percent: 23 to 28 wt% of Ca, 51 to 55 wt% of Si, 0.65 to 1.5 wt% of Mg, 1.3 to 2.5 wt% of Ba, 0.6 to 1.0 wt% of Re, 0.6 to 1.2 wt% of B, 1.6 to 3.5 wt% of Zr, 1.3 to 2.8 wt% of Ti, 0.6 to 1.2 wt% of Nb, and balance of ferrum and inevitable impurities. The invention reduces the content of C in high-strength steel through reasonably designing the chemical components and simultaneously and greatly enhances the grain sizes in continuous casting billets so that the grains are refined. The mechanical properties of the steel can be obviously improved, and the transverse impact properties of the steel are obviously enhanced to approximate to longitudinal impact value. Besides, the invention well solves the problems of center segregation and center porosity of the continuous casting billets, nonuniform impurity distribution, and the like.

Description

technical field [0001] The invention relates to a cored wire, in particular to a micro-alloyed composite cored wire for high-strength steel. Background technique [0002] With the rapid development of my country's national economy, the development of the domestic iron and steel industry has also grown rapidly. In recent years, my country's steel output has been ranked first in the world. China is a veritable steel power, but not a steel power. Steel products with high strength, high toughness and high added value still need to be imported in large quantities from abroad. Therefore, the development and development of high-performance, high-value-added steel products to make China a steel power as soon as possible has always been the direction of our people, especially the metallurgical industry. [0003] In addition to scientific rolling and heat treatment processes, reasonable composition design is also the key to production of high-strength and excellent steel plates. Al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C22C1/10
Inventor 樊兴龙李志远
Owner HUBEI KMK WELDING MATERIALS