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Wear-resistant steel and smelting method

A smelting method and technology of wear-resistant steel, which is applied in the field of wear-resistant steel and smelting, can solve problems such as local structure and performance differences, core segregation and negative segregation, cutting or welding cracks, etc., to improve core segregation and product performance The effect of stable and uniform alloy composition

Active Publication Date: 2019-07-12
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve high strength, many alloys are added to the steel grade. If the purity of the molten steel is not high, or the alloy segregation is serious, cutting or welding cracks will appear, and the steel plate can only be changed.
During the billet cutting process, cutting cracks occurred many times. After inspection, there are large titanium nitride inclusions in the segregation of the core of the billet. Due to the high alloy content, core segregation and negative segregation will occur during the pouring process, resulting in local microstructure and properties. Difference, cracking occurs during steel plate processing and welding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of wear-resistant steel provided in this example, the product grade is NM450~NM550, its chemical composition and mass percentage are as follows: C: 0.23%, Si: 0.33%, Mn: 1.3%, P: 0.008%, S: 0.0012% , Nb: 0.028%, Cu: 0.020%, Mo: 0.22%, Ti: 0.021%, Ni: 0.81%, Cr: 0.72%, Ca: 0.0021%, V: 0.03%, B: 0.0018%, Al: 0.033% , the balance being Fe and impurities.

[0040] The above-mentioned smelting method of wear-resistant steel comprises the following steps:

[0041] S1. The desulfurization station adopts the KR method for desulfurization. Sampling after desulfurization: S: 0.0010%. After desulfurization, the slag is cleaned to ensure that the visible iron level is more than half;

[0042] S2. The converter adopts the top-bottom combined blowing mode for blowing. When the smelting oxygen blowing reaches 85%, the secondary gun is used to measure the temperature and sample, and the end point temperature is repaired according to the measured value. The temperature meets 1603°...

Embodiment 2

[0049] A kind of wear-resistant steel provided in this example, the product grade is NM450~NM550, its chemical composition and mass percentage are as follows: C: 0.28%, Si: 0.18%, Mn: 0.55%, P: 0.008%, S: 0.0011% , Nb: 0.016%, Cu: 0.010%, Mo: 0.48%, Ti: 0.019%, Ni: 0.38%, Cr: 0.333%, Ca: 0.0015%, V: 0.023%, B: 0.0013%, Al: 0.029% , the balance being Fe and impurities.

[0050] The above-mentioned smelting method of wear-resistant steel comprises the following steps:

[0051] S1. The desulfurization station adopts the KR method for desulfurization. Sampling after desulfurization: S: 0.0010%. After desulfurization, the slag is cleaned to ensure that the visible iron level is more than half;

[0052] S2. The converter adopts the top-bottom combined blowing mode for blowing. When the smelting oxygen is blown to 85%, the sub-lance is used to measure the temperature and sample, and the end point temperature is repaired according to the measured value. The temperature meets 1623°C, ...

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PUM

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Abstract

The invention discloses wear-resistant steel which is prepared from, by mass, 0.20%-0.30% of C, 0.10%-0.35% of Si, 0.40%-1.50% of Mn, 0.010% or less of P, 0.0020% or less of S, 0.010%-0.030% of Nb, 0.050% or less of Cu, 0.10%-0.50% of Mo, 0.010%-0.030% of Ti, 0.10%-0.90% of Ni, 0.3%-0.9% of Cr, 0.001%-0.0050% of Ca, 0.01%-0.03% of V, 0.0010%-0.0030% of B, 0.020%-0.060% of Al and the balance Fe andimpurities. Influences of large-particle inclusions in a steel plate on the stress of the steel plate are reduced, and the phenomenon that a casting blank and the steel plate are likely to crack whenmachined is relieved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a wear-resistant steel and a smelting method. Background technique [0002] Wear-resistant steel is a high-strength steel with high surface hardness, which plays a role in wear resistance during use. In order to achieve high strength, many alloys are added to the steel grade. If the purity of the molten steel is not high, or if the alloy segregation is serious, cutting or welding cracks will appear, and the steel plate can only be treated differently. During the billet cutting process, cutting cracks occurred many times. After inspection, there are large titanium nitride inclusions in the segregation of the core of the billet. Due to the high alloy content, core segregation and negative segregation will occur during the pouring process, resulting in local microstructure and properties. Differences, cracking occurs during steel plate processing and welding. Cont...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C21C5/35C21C7/06C21C7/10
CPCC21C5/35C21C7/06C21C7/10C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 翟冬雨吴俊平方磊姜金星杜海军刘继红员强鹏殷杰刘呈军袁海军胡志勇闫强军靳建峰杨柳
Owner NANJING IRON & STEEL CO LTD
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