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Method for controlling the cross crack of blank angle of high nitrogen steel casting board containing vanadium

A control method and high nitrogen steel technology, which is applied in the field of vanadium-containing high nitrogen steel continuous casting slab surface and subcutaneous quality control, can solve problems such as difficulty in performance, reduce cleaning losses, and eliminate surface and subcutaneous corner transverse cracks Defects, the effect of mitigating copper brittleness defects

Inactive Publication Date: 2007-09-19
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above studies, it can be seen that the surface quality control of micro-alloyed slabs currently studied is limited to the angle and transverse cracks on the surface of low-nitrogen steel slabs that do not contain copper, nickel, and chromium. It is difficult to play a greater role in the control of transverse crack defects in subcutaneous corners

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment uses the control method of the present invention to control YQ450NQR1 brand high-strength weather-resistant B-shaped steel slab reticular crack defects. The chemical composition of YQ450NQR1 high-strength weather-resistant steel is shown in Table 1.

[0022] In continuous casting production, set the cooling water volume on the wide side of the crystallizer to 3000L / min and the water volume on the narrow side to 360L / min before pouring, and quickly push the alkalinity (CaO / SiO 2 ) is 1.35, the melting point is 1100°C, and the viscosity is 0.10Pa·s mold flux at 1300°C, and the casting speed of the casting machine is increased and stabilized to 1.5m / min in a short period of time. At this time, the vibration frequency of the casting machine Reach 210Hz, and at the same time set the amount of cooling water for the billet in the secondary cooling section (the specific water amount for continuous casting) to 0.60L / kg. The consumption of mold slag during applica...

Embodiment 2

[0025] This embodiment is to use the control method of the present invention to control the Q450NQR1 high-strength weathering steel slab reticular crack defect, the chemical composition of Q450NQR1 high-strength weathering steel is shown in Table 2.

[0026] Before the continuous casting production, the cooling water volume of the wide surface of the crystallizer is set to 3050L / min, the water volume of the narrow surface is set to 365L / min, and the cooling water consumption of the billet in the secondary cooling section (continuous casting specific water volume) is set to 0.55L / min kg. Quickly push the alkalinity (CaO / SiO 2) is 1.20, the melting point is 1120°C, and the viscosity is 0.20Pa·s at 1300°C, and the casting speed of the casting machine is increased and stabilized to 1.2m / min in a short period of time. At this time, the vibration frequency of the casting machine 180Hz, the consumption of mold slag during application is measured as 0.60kg / t, the surface temperature ...

Embodiment 3

[0029] This embodiment uses the control method of the present invention to control YQ450NQR1 brand high-strength weather-resistant B-shaped steel slab reticular crack defects. The chemical composition of YQ450NQR1 high-strength weather-resistant steel is shown in Table 1. During continuous casting production, before casting, set the cooling water volume on the wide side of the crystallizer to 3025L / min, and set the water volume on the narrow side to 362L / min. Set to 0.58L / kg. Quickly push the alkalinity (CaO / SiO 2 ) is 1.0, the melting point is 1160°C, and the viscosity is 0.40Pa·s mold flux at 1300°C, and the casting speed of the casting machine is increased and stabilized to 0.8m / min in a short period of time. At this time, the vibration frequency of the casting machine 140Hz, the consumption of mold slag during application is determined to be 0.65kg / t, the surface temperature of the slab at the outlet of the mold reaches 1050°C, the surface temperature of the slab in the s...

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Abstract

The invention discloses a transverse crack control method of high nitrogen steel continuous casting plate billet angle containing vanadium, the method can not only effectively eliminate transverse crack defect of the continuous casting billet surface and skin inferior angle, but also can eliminate the continuous casting billet surface longitudinal crack and surface transverse crack defect. The method synthetically applies following technique measures: presetting the mold cooling water amount, the wide face cooling water amount is 3000-30500 L / min, the narrow face cooling water amount is set to 360-365 L / min; improving casting pulling rate, the casting pulling rate is stabilized in 0.8-1.5 m / min, the vibration frequency is 140-210 Hz; after spruing the casting pulling rate, quickly putting casting powder into the mold, the alkalinity of the casting powder is 1.0-1.40, the melting point is 1100-1160 DEG C, when at 1300 DEG C, the viscosity is 0.10-0.40 Pa.s; reducing the second cool segment casting billet cooling water amount, and controlling the continuous casting ratio water amount in 0.55-0.60 L / kg by static or dynamic adjusting method.

Description

technical field [0001] The invention relates to a quality control method for continuous casting slabs, in particular to a method for controlling the surface and subcutaneous quality of vanadium-containing high nitrogen steel continuous casting slabs. Background technique [0002] The content of Cu, Cr, Ni, Al, V, N elements in the composition of vanadium-containing high-nitrogen high-strength weathering steel is relatively high, and the carbon content is located in the peritectic reaction zone. When continuous casting produces steel with carbon content located in the peritectic reaction zone, the slab is prone to surface cracks, and the addition of Cu, Cr, Ni and other components in the steel makes the crack sensitivity of the steel stronger, and the addition of Al at the same time , V, N and other components in the continuous casting production process, because Al and V in solid solution at high temperature are dynamically precipitated or statically precipitated at the aust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 陈永曾建华李桂军杨素波李茂林张均祥
Owner PANZHIHUA IRON AND STEEL
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