Method for treating inclusions in hot-rolled steel plates for welded gas cylinder

A processing method and technology of hot-rolled steel plates, which are applied in the field of steelmaking, can solve the problems of high content of inclusions and achieve the effect of improving cold-formation performance

Inactive Publication Date: 2009-06-03
PANGANG GROUP RESEARCH INSTITUTE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the prior art, the sulfide inclusions are generally 2.0 to 3.0 grades. The purpose of the present invention is to solve the problem of excessive inclusion content in the hot-rolled steel plates for welding gas cylinders in the prior art, and to control the sulfide inclusions to 0 grades. ~Level 1.5

Method used

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  • Method for treating inclusions in hot-rolled steel plates for welded gas cylinder
  • Method for treating inclusions in hot-rolled steel plates for welded gas cylinder
  • Method for treating inclusions in hot-rolled steel plates for welded gas cylinder

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Experimental program
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Embodiment 1

[0034] When the S content of the molten iron in the furnace is controlled to be S=0.005% during steelmaking, no Ca-Fe cored wire is fed into the steel for Ca treatment, and the No. 1 sample HP295 steel is obtained. After testing, in No. 1 sample HP295 steel, type A sulfide inclusions are grade 0, type B oxide inclusions are grade 0.5, type C silicate inclusions are grade 0, and type D spherical oxide inclusions are grade 1.0 .

Embodiment 2

[0036] When making steel, control the S content of the molten iron into the furnace to be S=0.009%, feed Ca-Fe cored wire to each furnace of steel, the wire feeding speed is 3m / s, blow argon for 3 minutes before feeding the wire, and use 150 Blow argon at the gas volume of standard liters / min, and continue to blow argon for 3 minutes after the end of the line feeding. The feeding amount of the Ca-Fe line is 800m / furnace, and the No. 2 sample HP295 steel is obtained. After testing, in No. 2 sample HP295 steel, type A sulfide inclusions are grade 0, type B oxide inclusions are grade 0, type C silicate inclusions are grade 0, and type D spherical oxide inclusions are grade 1.0 .

Embodiment 3

[0038] During steelmaking, the S content of molten iron in the furnace is controlled to be S=0.015%. Each furnace of steel is fed with Ca-Fe cored wire at a speed of 4m / s. Argon is blown for 3 minutes before wire feeding. Blow argon at the gas volume of standard liters / min, and continue to blow argon for 3 minutes after the end of the line feeding. The feeding amount of the Ca-Fe line is 1000m / furnace, and the No. 3 sample HP325 steel is obtained. After testing, in No. 3 sample HP325 steel, type A sulfide inclusions are grade 0, type B oxide inclusions are grade 0.5, type C silicate inclusions are grade 0, and type D spherical oxide inclusions are grade 1.0 .

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Abstract

The invention discloses a method for treating inclusions in hot-rolled steel plates for a welded gas cylinder. The method includes the following steps: the content of S in molten steel entering a furnace is controlled to be less than or equal to 0.015 percent by weight when steel production; the molten steel is calcium-treated in the process of steel production, that is, Ca-Fe core-spun yarn with a different amount is fed in to carry out Ca treatment on the molten steel according to different S contents in the molten steel so that sulfide in steel is spheroidized. Sulfide inclusions of the hot-rolled steel plates after the Ca treatment are spherically distributed in small sizes so that the hot-rolled steel plates for the welded gas cylinder has good cold roll forming performance.

Description

technical field [0001] The invention relates to the technical field of steelmaking, and more specifically, the invention relates to a method for treating inclusions in the smelting process of a hot-rolled steel plate for welding gas cylinders. Background technique [0002] Welded gas cylinders are generally used to hold liquefied petroleum gas as fuel, and are widely used in public places such as homes, canteens, and restaurants. Since the performance of welded gas cylinders is directly related to the safety of users, the quality requirements for the hot-rolled steel plates used to make welded gas cylinders are relatively high. Welding gas cylinders require steel plates to have good welding performance and stamping performance, and the steel used for welding gas cylinders must have high cleanliness and low non-metallic inclusion content. Excessive non-metallic inclusion content in steel for welding gas cylinders will reduce the anti-knock performance of steel cylinders. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 宋立秋
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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