CN104001880B

CN104001880B - The straight arc slab of a kind of potassium steel continuous cast method

Info

Publication number: CN104001880B
Application number: CN201410249119.2A
Authority: CN
Inventors: 张彬; 李忠利
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2014-06-08
Filing date: 2014-06-08
Publication date: 2016-05-25
Anticipated expiration: 2034-06-08
Also published as: CN104001880A

Abstract

The straight arc slab of a kind of potassium steel continuous cast method, belongs to field of metallurgy, and the chemical composition mass percent of described potassium steel is: C is that 0.95～1.05, Mn is 7.00～9.00, P≤0.020, S≤0.020, and surplus is iron and inevitable impurity; Moisture≤0.5% of covering slag, fusing point is 830 ± 30 DEG C, 1300 DEG C of viscositys, pa.s is 0.12 ± 0.05; The middle bag degree of superheat is 20-35 DEG C, and middle covering agent is acid, and insertion depth is 150-155mm, and a cold water flow is 3150/480L/min, and pulling rate is 0.70-0.75m/min, and two cold specific waters are 0.53L/kg, and electromagnetic agitation is 950A/2.5HZ/35 second. The present invention can produce the high-alloy steel continuous casting steel billet of qualified manganese content 8.0%, reduces production costs, and enhances productivity.

Description

The straight arc slab of a kind of potassium steel continuous cast method

Technical field

The invention belongs to field of metallurgy, be specifically related to the straight arc slab of a kind of potassium steel continuous casting manufacturing technique.

Background technology

High manganese wear-resistant steel plate has been widely used in the position that abrasion-proof backing block of plant equipment etc. is is easily worn and torn by thump. Liner plate, the backplate of external wear-resisting machinery are eliminated foundry goods already, and adopt high manganese wear-resistant steel rolled plate. High manganese wear-resistant steel rolled plate is with its good anti-wear performance, be widely used in the position that shot-blasting machine, power plant fan mill blade etc. are are easily worn and torn by thump, in the enterprises such as shipbuilding, automobile, machinery, generating, cement, mine, coal, be used widely, become the inevitable development trend of abrasion-resistant stee selection of new generation.

Potassium steel steel grade is very responsive to crackle, produce in process of setting at continuous casting, if it is improper to control, being easy to produce stress concentrates, thereby cause strand to crack, especially for straight arc billet continuous casting machine, strand produces great distortional stress while entering bending section and straightening section, be almost difficult to ensure the plastic deformation of such steel grade strand. Therefore this steel grade continuous casting process control ratio is more difficult, and strand easily cracks defect, even causes the serious production accidents such as bleed-out, and at present domestic common employing die casting is produced.

But because this type of steel grade carbon and manganese content is very high, in casting cycle, easily form carbide, cause such steel grade crack sensitivity extremely strong, cannot realize continuous casting process, can only produce with die casting process. And die casting process production recovery rate of iron is low, production cost is high.

Summary of the invention

In order to reduce production costs, the invention provides the straight arc slab of a kind of potassium steel continuous cast method that adopts straight circular-arc type continuous casting machine to substitute die casting production potassium steel, making straight arc billet continuous casting machine produce high Mn content steel grade becomes possibility.

Technical scheme of the present invention:

Chemical composition mass percent is: C is that 0.95～1.05, Mn is 7.00～9.00, P≤0.020, S≤0.020, and surplus is iron and inevitable impurity.

Casting rate is 0.70～0.75m/min;

Covering slag requires: biodiversity percentage≤0.5%, and fusing point is 830 ± 30 DEG C, and temperature is 1300 while spending, and viscosity is 0.12 ± 0.05pa.s; Covering slag consumption 0.60kg/ ton steel, the thick 7mm of melt cinder;

Conticaster adopts straight circular-arc type continuous casting machine, and the basic radius of conticaster is 8.0m, and cast section thickness is 200～220mm, and cast section width is 1060～1380mm, and casting machine metallurgical length is 22.49m, and copper plate of crystallizer length is 800mm.

Casting parameters: the middle bag degree of superheat is 20～35 DEG C, middle covering agent is acid, insertion depth is 150～155mm, one cold water flow is 480～3150L/min, pulling rate is 0.70～0.75m/min, and two cold specific waters are 0.53L/kg, and electromagnetic agitation is 950A/2.5HZ/35 second.

The present invention adopts the alternative die casting of straight circular-arc type continuous casting machine to produce the qualified slab of manganese content 8.0%, avoid potassium steel continuous casting steel billet to occur underbead crack, face crack, rimhole, slag inclusion, the mass defect such as be mingled with, avoid bleed-out accident, improve the production efficiency of potassium steel, recovery rate of iron improves, and has reduced production cost.

Detailed description of the invention

The TAW of one stove manganese content 8.0%, section 220*1260mm. Technical process is as follows:

Steel grade chemical composition mass percent is: C is that 1.00, Mn is 8.00, P≤0.020, S≤0.020, and surplus is iron and inevitable impurity.

Casting rate is 0.70～0.75m/min;

The parameter of covering slag is: biodiversity percentage≤0.5%, and fusing point is 830 ± 30 DEG C, and temperature is 1300 while spending, and viscosity is 0.12 ± 0.05pa.s;

Technological parameter: middle bag temperature 1 is 1450 DEG C, and pulling rate is 0.70m/min; Middle bag temperature 2 is 1455 DEG C, and pulling rate is 0.70m/min; Middle bag temperature 3 is 1456 DEG C, and pulling rate is 0.70m/min.

Electromagnetic agitation requires: electric current is 950A, and frequency is 2.5Hz, and the time is 35 seconds.

Continuous casting requires: a cold water flow is 480～3150L/min, and two cold specific waters are 0.53L/kg; Liquid core degree of depth 13.5m under the pulling rate of 0.70m/min; 820 DEG C of casting blank surface temperatures before aligning.

Claims

1. the straight arc slab of a potassium steel continuous cast method, the chemical composition mass percent that it is characterized in that described potassium steel is: steel grade chemical composition mass percent is: C is that 1.00, Mn is 8.00, P≤0.020, S≤0.020, surplus is iron and inevitable impurity; Casting rate is 0.70 ~ 0.75m/min;

Conticaster adopts straight circular-arc type continuous casting machine, and conticaster radius is 8.0m, and cast section thickness is 200 ~ 220mm, and cast section width is 1060 ~ 1380mm, and casting machine metallurgical length is 22.49m, and copper plate of crystallizer length is 800mm;

Technological parameter: wrapping temperature in first is 1450 DEG C, and pulling rate is 0.70m/min; In second, wrapping temperature is 1455 DEG C, and pulling rate is 0.70m/min; In the 3rd, wrapping temperature is 1456 DEG C, and pulling rate is 0.70m/min;

Electromagnetic agitation requires: electric current is 950A, and frequency is 2.5Hz, and the time is 35 seconds;

Continuous casting requires: a cold water flow is 480 ~ 3150L/min, and two cold specific waters are 0.53L/kg; Liquid core degree of depth 13.5m under the pulling rate of 0.70m/min; 820 DEG C of casting blank surface temperatures before aligning.