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Hot-rolled round steel produced by continuous casting and production method thereof

A production method and round steel technology, which is applied in the field of iron and steel smelting, can solve the problems of increased central porosity of round steel, inner surface defects, and reduced performance and grade of hot-rolled round steel, so as to achieve low central porosity and reduce central porosity , the effect of reducing the content

Active Publication Date: 2020-05-19
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the production testing process, it was found that the center of the degraded round steel often has a large number of non-metallic inclusions and bubbles attached to the surface of the non-metallic inclusions. The non-metallic inclusions are mainly P compounds, S compounds, some deoxidizers and slag , non-metallic inclusions and air bubbles, which greatly increase the central porosity of the round steel and even accompanied by severe central segregation, which reduces the performance and grade of the hot-rolled round steel. defect

Method used

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  • Hot-rolled round steel produced by continuous casting and production method thereof
  • Hot-rolled round steel produced by continuous casting and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A hot-rolled round steel produced by continuous casting, which is produced by comprising the following steps:

[0041] S1 Smelting: Put molten iron and steel scrap into the converter, carry out conventional top-bottom compound blowing and control the blowing oxygen pressure to 0.8MPa, when the tapping temperature is 1610°C, detect the carbon content in the molten steel, and control the carbon at the end of the converter to 0.15wt %, then tap steel into the ladle;

[0042] S2 deoxidation alloying: The converter blows argon throughout the process of tapping into the ladle. When the molten steel in the ladle reaches 1 / 4 of the maximum capacity of the molten steel in the ladle, add carbon powder of 0.33kg / ton of steel and 9.00kg / ton of steel into the ladle. Silicon-manganese alloy of steel, high-carbon ferrochromium of 3.43kg / ton of steel, ferrovanadium alloy powder of 15.00kg / ton of steel, and the above-mentioned added materials are added before the molten steel in the lad...

Embodiment 2

[0054] On the basis of embodiment 1, the electromagnetic stirring of the crystallizer in S4 molten steel casting is improved, and the improvement is that the stirring zone of the electromagnetic stirring of the crystallizer is divided into a first stirring zone and a second stirring zone, and the first stirring zone is located between the ultrasonic zone and the second stirring zone. Between the buffer zones, the circulation direction of the first stirring zone is horizontal and it starts intermittently, and the second stirring zone is located at the entrance of the crystallizer and the horizontal axis of the stirring circulation direction is parallel to the pulling direction of the slab.

Embodiment 3

[0056] On the basis of Example 2, the electromagnetic stirring of the mold in S4 molten steel casting is improved, and the third stirring zone and the fourth stirring zone are added. The third stirring zone is located at the exit of the mold and the axis of the stirring circulation direction is perpendicular to the pulling direction of the slab. , the fourth stirring zone is located behind the fourth stirring zone and the axis of its stirring circulation direction is parallel to the pulling direction of the slab.

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Abstract

The invention relates to the field of steel smelting and discloses a hot-rolled round steel produced by continuous casting and a production method. The production method is characterized in that the hot-rolled round steel produced by continuous casting is obtained by smelting, deoxidation, LF (Ladle Furnace) refining, molten steel casting, cooling, steel-billet heating, hot rolling, controlled cooling after rolling, and steel finishing. The hot-rolled round steel is prepared from the following components in percent by mass: 0.37-0.44wt% of C, 0.17-0.20wt% of Si, 0.50-0.80wt% of Mn, 0.001-0.01wt% of P, 0.001-0.012wt% of S, 0.20-0.25wt% of Cr, 0.28-0.33wt% of V, 0.010-0.025wt% of Al, 97.27-97.95wt% of Fe, 0.5-0.67wt% of other metallic elements and the balance of inevitable impurities. The hot-rolled round steel produced by continuous casting and the production method disclosed by the invention have the beneficial effects that a tundish in molten-steel casting is internally provided witha slag-floating area, an ultrasonic area and a buffering area from top to bottom, so that continuous production for obtaining the hot-rolled round steel is realized, the amount of non-metallic inclusions and small bubbles in the center are fewer, the central porosity of the hot-rolled round steel is low and the property and the grade qualification rate of the hot-rolled round steel are improved.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a hot-rolled round steel produced by continuous casting and a production method thereof. Background technique [0002] Hot-rolled round steel is a kind of round steel. Its specification is 5.5-250 mm. It has the characteristics of good hardenability, high hardness, good wear resistance, and small heat treatment deformation. Among them, small round steel of 5.5-25 mm is commonly used. Used as raw materials for manufacturing steel bars, bolts and various mechanical parts; hot-rolled round steel larger than 25 mm is mainly used for manufacturing mechanical parts or as raw materials for seamless steel pipe billets. [0003] Hot-rolled round steel needs to be tested and graded according to the "GB / T1979-2001 Structural Steel Low-magnification Defect Grading Standard" before storage. During the production testing process, it was found that the center of the degraded round steel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/06C22C38/28C22C33/06C21D8/06B22D11/115C21C7/06
CPCB22D11/115C21C7/0056C21C7/06C21D8/065C22C33/06C22C38/02C22C38/04C22C38/06C22C38/24C22C38/28Y02P10/20
Inventor 杜海红刘晓军花凌冬
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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