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Method for controlling content of residual elements in medium-carbon high-strength tough steel

A technology of residual elements and control methods, which is applied in the field of steel smelting and impurity removal, can solve the problems of high-strength steel production technology to be strengthened, low gas content and purity of medium-carbon high-strength steel, and achieve good economic and social benefits. Material purity, effect of reducing S content

Pending Publication Date: 2022-03-04
SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing high-strength steel smelting methods generally have low gas content and purity of medium-carbon high-strength steel, which is difficult to meet the needs of steel in special fields such as weaponry and aerospace. Most of them rely on imported high-strength steel production technology used in special fields It needs to be strengthened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A medium-carbon high-strength and high-toughness steel, its chemical element composition is calculated by weight percentage: C: 0.30%, Si: 1.45%, Mn: 0.70%, Cr: 3.4%, Ni: 0.98%, Mo: 0.49%, W: 0.48%, balance Fe.

[0027] By optimizing the proportion of pure iron + metal alloy as the main component, and using a non-vacuum induction furnace for melting, the melting temperature is 1570°C, and the slag is evenly added in batches and small batches throughout the melting process. Slag, dissolve and remove more than 80% of the slag, heat the molten steel to 1620°C and pour it into the ladle; transfer the molten steel to the LF furnace, use fine desulfurization slag, the slag components are lime and fluorite, the mass ratio = 2:1, and the refining period uses Composite deoxidation of J-Al powder and J-Ca powder, the slag is white, the deoxidation is sufficient and the temperature is quickly raised to 1670°C, the maintenance time is t=35min, and the Ar gas pressure is maintained ...

Embodiment 2

[0029] A medium-carbon high-strength and high-toughness steel, the chemical element composition of which is calculated by weight percentage: C: 0.29%, Si: 1.80%, Mn: 0.70%, Cr: 1.05%, Ni: 4.48%, Mo: 0.60%, Balance Fe. By optimizing the proportion of pure iron + metal alloy as the main component, and using a non-vacuum induction furnace for melting, the melting temperature is 1620°C, and the slag is evenly added in batches and small batches throughout the melting process, so that the molten steel is fully covered without exposure, and it is made twice. slag, 85% of the slag is dissolved and removed, and the molten steel is heated to 1650°C and poured into the ladle; the molten steel is transferred to the LF furnace, and the fine desulfurization slag is used. The components of the slag are lime and fluorite, and the mass ratio is 5:1. Composite deoxidation of J-Al powder and J-Ca powder, the slag is white, the deoxidation is sufficient and the temperature is quickly raised to 16...

Embodiment 3

[0031] A medium-carbon high-strength and high-toughness steel, its chemical element composition is calculated by weight percentage: C: 0.30%, Si: 0.28%, Mn: 0.45%, Cr: 0.75%, Ni: 2.30%, Mo: 0.25%, V: 0.20%, balance Fe. By optimizing the proportion of pure iron + metal alloy as the main component, and using a non-vacuum induction furnace for melting, the melting temperature is 1610°C, and the slag is evenly added in batches and small batches throughout the melting process, so that the molten steel is fully covered and no exposure is made. The slag is dissolved and removed to 82%, and the molten steel is heated to 1645°C and poured into the ladle; the molten steel is transferred to the LF furnace, and the refined desulfurization slag is used. The components of the slag are lime and fluorite, and the mass ratio is 3:1. J -Composite deoxidation of Al powder and J-Ca powder, white slag, sufficient deoxidation and rapid temperature rise to 1665°C, maintenance time t=38min, Ar gas pr...

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PUM

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Abstract

The invention provides a method for controlling the content of residual elements in medium-carbon high-strength tough steel, and belongs to the technical field of smelting and impurity removal of steel. The control method comprises the following steps that (1) the smelting temperature is controlled to be 1570-1620 DEG C, slag materials are evenly added in batches, it is guaranteed that the slag removal amount reaches 80% or above after dissolving clarification, and primary molten steel is prepared; (2) transferring the primary molten steel to an LF furnace, adding slag charge, J-Al powder and J-Ca powder for complex deoxidation, when the temperature of slag white rises to 1660 DEG C or above, maintaining PAr = 0.3-0.5 MPa, and supplementing the slag charge to prepare refined molten steel; and (3) the refined molten steel is transferred to a VD furnace for deslagging, the vacuum degree is controlled to be 67 Pa or below, the vacuum degree is maintained for 15 min, Ar is blown till PAr is 0.1-0.2 MPa, and follow-up smelting steel making is conducted. By means of the control method, the content of residual impurity elements in the obtained steel is that S is smaller than or equal to 10 ppm, Ti is smaller than or equal to 70 ppm, and N is smaller than or equal to 25 ppm.

Description

technical field [0001] The invention belongs to the technical field of steel smelting and impurity removal, and in particular relates to a method for controlling the content of residual elements in medium-carbon high-strength tough steel. Background technique [0002] Nowadays, the application of advanced high-performance steel materials is more and more extensive, and the demand is also increasing. High-strength and tough steel is one of them, and it has now developed into an important steel class with wide application, and is widely used in special fields such as rocket engine shells, aircraft landing gear, and bulletproof steel. [0003] High-strength and tough steel materials must not only have high strength, but also have excellent toughness at the lowest possible cost, especially for the material's plane fracture toughness index. At present, the existing high-strength steel smelting methods generally have low gas content and purity of medium-carbon high-strength steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/076C21C7/10C22C38/44C22C38/46C22C38/04C22C38/02C22C33/04
CPCC21C7/06C21C7/0006C21C7/10C21C7/076C22C38/44C22C38/46C22C38/04C22C38/02C22C33/04Y02P10/20
Inventor 王杨黄志永朱小阳何梦华何剑
Owner SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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