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

Continuous casting plate blank surface quenching technology and used device

A surface quenching and continuous casting technology, used in quenching devices, manufacturing tools, heat treatment equipment, etc., can solve the problems of micro-cracks on the surface of steel plates, cracking and spreading of grain boundaries, and embrittlement of grain boundaries, so as to avoid micro-cracks and improve mechanical properties. performance effect

Inactive Publication Date: 2015-05-27
JIGANG GRP
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]At present, due to the influence of micro-cracks on the steel plate surface, the proportion of hot delivery and hot charging of continuous casting slabs used for rolling medium and thick plates in China is still less than 20%. The main reason is that Coarse nitrides or carbonitrides of microalloying elements such as Nb, V, Ti, Al, and B precipitated on the surface of the red slab, and they always gather at the grain boundaries in the form of liquid before and after heating in the heating furnace, resulting in the formation of grain boundaries. Embrittlement, during the rolling process, cracking and expansion along the grain boundary occurs, resulting in micro-cracks on the surface of the steel plate

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
  • Continuous casting plate blank surface quenching technology and used device
  • Continuous casting plate blank surface quenching technology and used device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The size of the continuous casting slab is 250mm×1820mm, the casting speed is 1.05m / min, and the steel type is Q550D.

[0025] As shown in the drawings of the description, there are three adjacent conveying rollers 4 on the continuous casting cutting conveying roller table, and two sets of nozzle groups are arranged between the adjacent conveying rollers 4 . Each nozzle group includes a total of 10 nozzles 3 in two rows and five rows, 20 nozzles in four rows and five rows above the conveying roller 4 roller surface, 20 nozzles in four rows and five rows in the bottom of the roller surface, and 3 nozzles in the upper and lower nozzle groups. One-to-one correspondence of positions. The distance between the nozzles 3 in each row is 480 mm, the upper and lower nozzles 3 are respectively 260 mm away from the upper and lower surfaces of the slab, and the angle between the nozzles 3 and the surface of the slab is 55°.

[0026] Each nozzle group is composed of nozzle pipe 1, b...

Embodiment 2

[0032] The size of the continuous casting slab is 250mm×2200mm, the casting speed is 0.90m / min, and the steel type is Q295NHB.

[0033] There are three adjacent conveying rollers 4 on the continuous casting cutting conveying roller table, and two upper and lower nozzle groups are arranged between the adjacent conveying rollers 4 . Each nozzle group includes a total of 12 nozzles 3 in two rows and six rows, 24 nozzles in four rows and six rows above the conveyor roller 4, 24 nozzles in four rows and six rows in the bottom of the roller surface, and 3 nozzles in the upper and lower nozzle groups. One-to-one correspondence of positions. The distance between the nozzles 3 in each row is 480 mm, the upper and lower nozzles 3 are respectively 280 mm away from the upper and lower surfaces of the slab, and the angle between the nozzles 3 and the surface of the slab is 50°.

[0034] Each nozzle group is composed of nozzle pipe 1, bracket 2 and nozzle 3. Nozzle 3 is connected to the wa...

Embodiment 3

[0040] The size of the continuous casting slab is 250mm×1820mm, the casting speed is 1.10m / min, and the steel type is Q460C.

[0041] There are three adjacent conveying rollers 4 on the continuous casting cutting conveying roller table, and two upper and lower nozzle groups are arranged between the adjacent conveying rollers 4 . Each nozzle group includes 15 nozzles 3 in three rows and five rows, 30 nozzles in six rows and five rows above the conveyor roller 4, 30 nozzles in six rows and five rows in the bottom of the roller surface, and 3 nozzles in the upper and lower nozzle groups. One-to-one correspondence of positions. The distance between the nozzles 3 in each row is 300 mm, the upper and lower nozzles 3 are respectively 300 mm away from the upper and lower surfaces of the slab, and the angle between the nozzles 3 and the surface of the slab is 45°.

[0042] Each nozzle group is composed of nozzle pipe 1, bracket 2 and nozzle 3. Nozzle 3 is connected to the water delive...

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 provides a continuous casting plate blank surface quenching technology and a used device. Before a continuous casting plate blank enters a heating furnace, the continuous casting plate blank is subjected to quick surface cooling on a continuous casting cutting conveying roll way; a temperature is reduced below 600 DEG C quickly; and an upper nozzle set and a lower nozzle set are arranged between adjacent conveying rolls of the continuous casting cutting conveying roll way. Nitride or carbonitride of bulky microalloy elements such as Nb, V, Ti, Al and B is inhibited from being precipitated on an austenite grain boundary effectively, so that crizzle of a steel plate after hot charge rolling of microalloy steel is avoided.

Description

technical field [0001] The invention relates to a steel plate manufacturing process and device, in particular to a continuous casting slab surface quenching process and the device used, the surface temperature of the continuous casting slab is rapidly reduced to below 600°C after the continuous casting slab leaves the fan section, which can avoid hot delivery of the casting slab Occurrence of micro-cracks on the steel plate surface after hot charging. Background technique [0002] The conventional process flow of steel plate production is: blast furnace hot metal-hot metal pretreatment-converter-CAS-LF (-RH)-continuous caster-heating furnace-rough rolling-finish rolling. With the increasingly fierce competition in the steel market, the industry is constantly seeking measures to further reduce production costs. The continuous casting slab hot charging and hot delivery process can reduce energy consumption, significantly increase the output of the heating furnace, and improve...

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): B22D11/124C21D1/667
Inventor 张润生刁承民刘建伟张海民蔡起良王玉民温维新苗振鲁叶勇吴克刚马海涛王嘉祺薛燕孔雅于海燕聂红梅
Owner JIGANG GRP