Unlock instant, AI-driven research and patent intelligence for your innovation.

The Method of Improving the Center Density of Slab

A technology of center density and billet, applied in the field of improving the center density of the billet, can solve the problems of incomplete welding of the center shrinkage cavity and limited increase of the billet density, and achieves good use effect, improved density and uniformity. High quality and simple operation

Active Publication Date: 2018-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention patent uses dynamic soft reduction technology to reduce the porosity and shrinkage cavity in the center of the slab. Welding center shrinkage cavity, limited increase in slab density

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • The Method of Improving the Center Density of Slab
  • The Method of Improving the Center Density of Slab
  • The Method of Improving the Center Density of Slab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] According to an embodiment of the present invention, this embodiment discloses a method for increasing the central density of the cast slab, through which the control method can effectively improve the central density of the axle steel cast slab produced from the bloom, thereby improving the internal quality of the rolled product. Specifically, the method for improving the density of the slab center in this embodiment includes the following steps:

[0033] Step 1. In the process of continuous casting to produce LZ50 axle steel, from the time when the molten steel starts pouring, protective sleeves are used to protect the pouring from the ladle to the tundish, from the tundish to the crystallizer, and the casting speed of the casting machine is stably controlled at 0.45m / Between min and 0.65m / min, the crystallizer adopts 500A, 2.4Hz electromagnetic stirring technology, and the solidification end adopts 350A, 7Hz electromagnetic stirring technology.

[0034] Step 2. Trea...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for improving compactness of the center of a casting blank. The method includes following steps: step 1, starting from molten steel casting, adopting protective casting in the whole process from a steel ladle to a tundish to a crystallizer, and controlling pulling speed of a casting machine within a range from 0.45m / min to 0.65m / min; step 2, controlling degree of superheat of molten steel for the tundish in the process of continuous casting within a range of 20-30 DEG C; step 3, adopting control of a solidification end under high pressure, increasing down-pressing quantity of the solidification end of a continuous casting blank to squeeze and discharge solute segregation molten steel, and at the same time welding a central contraction hole to improve compactness of the center of the casting blank; step 4, adopting a dynamic secondary cooling control mode to correlate basic water amount with average pulling speed of the casting blank; step 5, adopting a secondary cooling mechanism with forced cooling of a back zone, and at the same time improving cooling strength, wherein specific water flow is 0.40kg / t steel to 0.50kg / t steel. By using the method, compactness of the center of an axle steel casting blank produced by a bloom can be improved effectively, so that internal quality of rolled metal can be improved.

Description

technical field [0001] The invention relates to the technical field of continuous casting technology, in particular to a method for improving the center density of a slab. Background technique [0002] Axle is an important part of railway vehicle running, and its quality status is directly related to the carrying capacity and transportation safety of the vehicle. Since the axle steel is medium carbon steel, the dendrites are more developed during the solidification process of the cast slab, and the core of the cast slab is easy to form a dendrite "bridge". In this way, the solidification process of molten steel under the bridge is like the solidification process of a small steel ingot, resulting in loose shrinkage cavities. Therefore, how to improve the center density of the axle steel slab is one of the key technologies for continuous casting to produce this type of steel. [0003] Patent application number 201210503475.3, titled "A large reduction technology for improvin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16B22D11/18
CPCB22D11/16B22D11/18
Inventor 马晓涛吴国荣祭程陈永杨文中曾建华潘红陈雄
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP