H13 round steel continuous casting and continuous rolling manufacturing process

A manufacturing process, continuous casting and rolling technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of internal looseness and difficult welding, surface rolling defects, affecting the quality of rolling materials and final products, etc. Achieve the effect of improving the qualified rate of ultrasonic flaw detection

Active Publication Date: 2019-01-08
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, due to the high alloy content of H13 steel, severe segregation, intermediate cracks and central cracks are prone to occur during the solidification process, the deformation resistance is large during the continuous casting process, a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment is a H13 round steel continuous casting and rolling manufacturing process, including:

[0019] ⑴Continuous casting: It is produced by an arc-shaped billet continuous casting machine with a section of 320mm×400mm or more, using ultra-weak cold cooling, with a specific water volume of 0.21L / Kg, the electromagnetic stirring parameter of the mold: 570A*2Hz, the light reduction mode is the former The three pressing rollers respectively press down 2mm-2mm-2mm, the last four pressing rollers have a reduction of 0mm, the pulling speed: 0.51m / min, and the superheat is 10℃;

[0020] ⑵After continuous casting, hot charging and sending to the heating furnace: the casting billet is sent to the heating furnace by a fully enclosed holding car, and the heating temperature is controlled at 300℃;

[0021] ⑶ High-temperature diffusion heating: high-temperature diffusion heating is carried out in a stepped heating furnace, the temperature of the non-heating section is 300℃, the te...

Embodiment 2

[0026] This embodiment is a H13 round steel continuous casting and rolling manufacturing process, including:

[0027] ⑴Continuous casting: It is produced by an arc-shaped billet continuous casting machine with a cross-section of 320mm×400mm or more, using ultra-weak cold cooling, specific water volume of 0.25L / Kg, mold electromagnetic stirring parameter: 570A*2Hz, light reduction mode is the former The three pressing rollers respectively press down 2mm-2mm-2mm, and the last four pressing rollers have a reduction of 0mm, the pulling speed: 0.6m / min, and the degree of overheating is 35℃;

[0028] ⑵After continuous casting, hot charging and sending to the heating furnace: the casting billet is sent to the heating furnace by a fully enclosed holding car, and the heating temperature is controlled at 700℃;

[0029] ⑶ High-temperature diffusion heating: high-temperature diffusion heating in a step-by-step heating furnace, the temperature of the non-heating section is 800℃, the temperature o...

Embodiment 3

[0034] This embodiment is a H13 round steel continuous casting and rolling manufacturing process, including:

[0035] ⑴Continuous casting: It is produced by an arc-shaped billet continuous casting machine with a cross-section of 320mm×400mm and above, using ultra-weak cold cooling, specific water volume is 0.23L / Kg, mold electromagnetic stirring parameters: 570A*2Hz, light reduction mode is the front The three pressing rolls respectively press down 2mm-2mm-2mm, the last four pressing rolls have a reduction of 0mm, the pulling speed: 0.55m / min, and the degree of overheating is 25℃;

[0036] ⑵After continuous casting, hot charging and sending to the heating furnace: the casting billet is sent to the heating furnace by a fully enclosed holding car, and the heating temperature is controlled at 500℃;

[0037] ⑶ High-temperature diffusion heating: high-temperature diffusion heating is carried out in a stepped heating furnace, the temperature of the non-heating section is 600℃, the temperat...

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Abstract

The invention relates to a continuous casting and continuous rolling manufacturing process of H13 round steel for hot working molds with specifications of phi 50 mm to phi 150 mm; the alloy content ofthe steel is 9%; arc billet continuous casting machines with sections above 300*400 mm are used for continuous casting; and a 850 reversible and continuous casting unit is used for rolling. As the alloy content of the steel is higher, the bad segregation, middle cracks and center cracks are easily generated in the solidification process, the deformation resistance in the continuous casting process is high, the surface rolling defects are easily generated, the welding is difficult in the rolling process due to internal looseness, the cracking phenomenon is easily generated through air coolingafter rolling, and the quality of rolled materials and final products is badly influenced. A continuous casting electromagnetic stirring technology, a light pressing technology and an ultraweak cold technology are applied, and such processes as high-temperature dispersion and belt temperature annealing are combined to effectively control the grade of belt structures, to prevent center cracks and surface cracks of continuous-cast blanks and cooling stress cracks of the rolled materials and to improve the ultrasonic flaw detection pass percent of the rolled materials and the pass percentage of the belt structures.

Description

Technical field [0001] The invention relates to a manufacturing process of round steel, in particular to a manufacturing process of H13 round steel continuous casting and rolling for hot work die with Φ50mm-Φ150mm. Background technique [0002] H13 steel belongs to air-cooled hardened steel and is one of the most representative hot work die steels. This steel has the advantages of good thermal strength, toughness, thermal fatigue performance, wear resistance and small heat treatment deformation. Due to the high alloy content of this steel and the high requirements for the band structure, most of the domestic production is carried out by die casting, electroslag remelting and forging, and the production cost is relatively high. [0003] The content of alloying elements in H13 steel is relatively high, reaching about 9%, and high-temperature thermoplasticity is low. Carbon and alloying elements are prone to severe segregation, especially the effect of chromium and vanadium, which ma...

Claims

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Application Information

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IPC IPC(8): B22D11/043B22D11/115B22D11/12B21B1/46B21B45/00C21D1/32C21D8/02
CPCB21B1/46B21B45/004B22D11/043B22D11/115B22D11/1206C21D1/32C21D8/0226C21D8/0263
Inventor 文辉李英奎
Owner NANJING IRON & STEEL CO LTD
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