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Inclusion control method for SWRH82B steel produced by carbon-free steel ladle

A carbon-free ladle and control method technology, applied in the field of metallurgy, can solve problems such as the increase of brittle inclusions

Inactive Publication Date: 2018-12-14
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the following problems exist in the prior art: the use of carbon-free ladles to produce SWRH82B steel will bring Al 2 o 3 The problem of increasing brittle inclusions

Method used

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  • Inclusion control method for SWRH82B steel produced by carbon-free steel ladle
  • Inclusion control method for SWRH82B steel produced by carbon-free steel ladle
  • Inclusion control method for SWRH82B steel produced by carbon-free steel ladle

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Embodiment 1

[0033] Example 1: Target composition of refining top slag, calculated by mass fraction, in %: CaO: 34.71; Al2O3: 6.63; SiO2: 40.22; MgO: 8.10; TFe+MnO≤1.41; Alkalinity R: 0.86. The inclusion composition is calculated by mass fraction in %: CaO: 31.74, Al 2 o 3 : 22.01, SiO 2 : 44.07, Als in steel is calculated by mass fraction: 0.0005, unit is %, inclusion size, 5 ~ 19μm.

Embodiment 2

[0034] Example 2: The target composition of refining top slag is calculated by mass fraction, and the unit is %: CaO: 38.29; Al2O3: 7.73; SiO2: 41.48; MgO: 6.60; TFe+MnO≤1.05; Alkalinity R: 0.92. The inclusion composition is calculated by mass fraction in %: CaO: 28.89, Al 2 o 3 : 18.73, SiO 2 : 51.08, calculated by mass fraction of Als in steel: 0.0006, unit is %, inclusion size, 5 ~ 22μm.

Embodiment 3

[0035] Example 3: Target composition of refining top slag, calculated by mass fraction, in %: CaO: 36.11; Al2O3: 9.01; SiO2: 35.49; MgO: 8.56; TFe+MnO≤1.10; Alkalinity R: 1.02. The inclusion composition is calculated by mass fraction in %: CaO: 31.33, Al 2 o 3 : 15.97, SiO 2 : 48.77, Als in steel calculated by mass fraction: 0.0003, unit is %, inclusion size, 8 ~ 20μm.

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Abstract

The invention provides an inclusion control method for SWRH82B steel produced by a carbon-free steel ladle. The inclusion control method for the SWRH82B steel produced by the carbon-free steel ladle comprises the following steps that step A, slag system target components of refining top slag are determined and the slag system target components comprise, by mass, 35%-45% of CaO, 6%-8% of AL2O3, 35%-45% of SiO2, 4%-9% of MgO and less than or equal to 1.6% of TFe + MnO; step B, the vacuum degree of RH vacuum refining is controlled at 300 Pa; step C, steel ladle bottom argon blowing time after acid slag is produced is controlled to be greater than 20 min; and step D, the sedation time from the end of refining treatment to the beginning of pouring is greater than 20 min, and binary basicity ofthe refining top slag is further controlled at 0.8-1.2. According to the inclusion control method for the SWRH82B steel produced by the carbon-free steel ladle, the cleanliness of the steel is improved, transformable inclusions with a low melting point are obtained, the problem that AL2O3 and other brittle inclusions increase due to the fact that the SWRH82B steel is produced by the carbon-free steel ladle is solved, and economic benefits are increased.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to an inclusion control method for producing SWRH82B steel with a carbon-free ladle. Background technique [0002] SWRH82B steel wire rod is used to produce high-strength low-relaxation prestressed steel strands, The wire rod needs to be made by continuous cold drawing The steel wire has a deformation ratio as high as 84%. Large particles and brittle inclusions in the steel are easy to cause broken wires during drawing. At the same time, the strength and toughness of the product after drawing fluctuate widely, and the qualified rate of finished products is low. Therefore, SWRH82B steel is required The quantity, size and type of non-metallic inclusions must be strictly controlled during production. [0003] The ladle is used to hold the molten steel, and its refractory material will have a great impact on the cleanliness of the molten steel. The difference between the magnesium-carbon l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/064C21C7/10
CPCC21C7/0006C21C7/0025C21C7/06C21C7/064C21C7/10
Inventor 李西德邓深樊雷李源源钱学海杨跃标刘崇林陈立鹏陈永金李栋梁志华
Owner LIUZHOU IRON & STEEL
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