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Method for controlling edge crack of niobium-containing low-alloy steel produced through CSP (contract strip production) technology

A low-alloy steel and edge cracking technology, applied in the field of metallurgy, can solve the problems of unrealistic fine control of continuous casting secondary cooling nozzles, poor applicability of thin slabs, continuous casting pouring breakouts, etc., and improve the overall process control level , Eliminate the edge crack defects of Nb-containing low-alloy steel, and reduce the effect of steel leakage accidents

Active Publication Date: 2017-11-28
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is mainly aimed at medium and thick plates, and the applicability to thin slabs is not strong, and it is unrealistic to control the continuous casting secondary cooling nozzle according to the specification and size of the slab
Especially when 0.06% ≤ C ≤ 0.07%, in the case of high content of molten steel metal element Mn, it is easy to cause carbon equivalent to increase, causing continuous casting pouring steel breakout accident

Method used

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  • Method for controlling edge crack of niobium-containing low-alloy steel produced through CSP (contract strip production) technology
  • Method for controlling edge crack of niobium-containing low-alloy steel produced through CSP (contract strip production) technology
  • Method for controlling edge crack of niobium-containing low-alloy steel produced through CSP (contract strip production) technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The present embodiment controls the method for edge cracking of CSP niobium-containing low-alloy steel, and its specific process steps are as follows:

[0033] 1) The chemical composition and mass percentage of molten steel in the continuous casting tundish are controlled as follows: C: 0.04%, Mn: 0.50%, Nb: 0.008%, N: 25ppm;

[0034] 2) Argon gas flow control in the continuous casting tundish: after the long nozzle of the continuous casting tundish is connected with the ladle drain, argon is used to seal the gap between the long nozzle and the ladle drain, and the argon flow rate is 2.0m³ / h;

[0035] 3) Continuous casting tundish covering agent control: start adding covering agent to the tundish when the ladle is pouring for 30 seconds, and the amount of covering agent added is 0.2㎏ / t steel;

[0036] 4) Continuous casting speed control: the steel drawing speed of the continuous casting machine is controlled at 3.95m / min;

[0037] 5) The straightening section uses a "T...

Embodiment 2

[0042] The present embodiment controls the method for edge cracking of CSP niobium-containing low-alloy steel, and its specific process steps are as follows:

[0043] 1) The chemical composition and mass percentage of molten steel in the continuous casting tundish are controlled as follows: C: 0.045%, Mn: 1.0%, Nb: 0.015%, N: 30ppm;

[0044] 2) Argon gas flow control in the continuous casting tundish: after the long nozzle of the continuous casting tundish is connected with the ladle drain, argon is used to seal the gap between the long nozzle and the ladle drain, and the argon flow rate is 2.2m³ / h;

[0045]3) Continuous casting tundish covering agent control: start adding covering agent to the tundish when the ladle is pouring for 60S, and the amount of covering agent added is 0.25kg / t steel;

[0046] 4) Continuous casting speed control: the steel drawing speed of the continuous casting machine is controlled at 4.0m / min;

[0047] 5) The straightening section uses a "T"-shape...

Embodiment 3

[0052] The present embodiment controls the method for edge cracking of CSP niobium-containing low-alloy steel, and its specific process steps are as follows:

[0053] 1) The chemical composition and mass percentage of molten steel in the continuous casting tundish are controlled as follows: C: 0.055%, Mn: 1.2%, Nb: 0.020%, N: 35ppm;

[0054] 2) Argon gas flow control in the continuous casting tundish: after the long nozzle of the continuous casting tundish is connected with the ladle drain, argon is used to seal the gap between the long nozzle and the ladle drain, and the argon flow rate is 2.8m³ / h;

[0055] 3) Continuous casting tundish covering agent control: start adding covering agent to the tundish when the ladle is pouring for 120S, and the amount of covering agent added is 0.3㎏ / t steel;

[0056] 4) Continuous casting speed control: the steel drawing speed of the continuous casting machine is controlled at 4.1m / min;

[0057] 5) The straightening section uses a "T"-shape...

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Abstract

The invention discloses a method for controlling the edge crack of niobium-containing low-alloy steel produced through a CSP (contract strip production) technology. The method comprises steps as follows: chemical ingredient control of continuous casting tundish molten steel, precise and protective casting of continuous casting tundish and a rolling process system, wherein in the step of chemical ingredient control of the continuous casting tundish molten steel, the casting molten steel is mainly prepared from chemical ingredients in percentage by mass as follows: smaller than or equal to 0.06% of C, 0.5%-1.4% of Mn, 0.008%-0.04% of Nb and smaller than or equal to 50 ppm of N; the rolling process system comprises a temperature system and a pressing system. Ingredients of the niobium-containing low-alloy steel are subjected to narrow ingredient control, and the product quality is improved while defects of the niobium-containing low-alloy steel are eliminated; in combination of equipment characteristics of a sheet billet continuous casting machine, equipment advantages are sufficiently played, and the defects of the niobium-containing low-alloy steel are eliminated under the condition that simple equipment is added; the equipment is high in adaptability and simple to operate and maintain. The bleed-out accident is reduced, the overall process control level is greatly improved, and a promoting function is played in whole production.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling edge cracking of CSP niobium-containing low-alloy steel. Background technique [0002] CSP (contract strip production) is a compact strip production process, which was researched and developed by German Schlomann SMS (SMS). The main feature of CSP technology is the use of vertical bending casting machines and funnel-shaped crystallizers. The initial billet shell is relatively thin, and 5-6 finishing mills are used. The thinnest finished strip steel is 1-2mm. Due to the compact layout of CSP equipment, short process, less land occupation, and less energy and power consumption, the operating cost is low, and it has strong market competitiveness in the production of ultra-thin hot-rolled strip steel, which is widely valued by international steel companies. . However, the CSP process has many process characteristics different from the traditi...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/12B22D11/111B22D11/16
CPCB22D11/111B22D11/16C22C38/04C22C38/12
Inventor 朱坦华巩彦坤席江涛靖振权高福彬丁剑刘庆岗周文涛
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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