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Process method for directly forging continuous casting billet to produce die steel

A process method and continuous casting slab technology, which is applied in the field of continuous casting slab direct forging to produce high-quality die steel, can solve problems such as low die life and die cracking, achieve low production cost, fast crystallization speed, and eliminate structure segregation.

Active Publication Date: 2019-11-29
江阴华润制钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the mold material with this structure cannot meet the requirements of harsh working environments such as die-casting, extrusion and precision forging, the life of the mold is very low, and even the overall cracking of the mold occurs

Method used

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  • Process method for directly forging continuous casting billet to produce die steel
  • Process method for directly forging continuous casting billet to produce die steel

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Experimental program
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Effect test

Embodiment 1

[0043] A process for producing high-quality mold round steel by continuous casting slab hard shell strong radial forging:

[0044] The first step: the annealed continuous casting billet φ500mm (steel type and model is H13 (4Cr5MoSiV1)), sawing and cutting length is 1500mm.

[0045] Step 2: The two sawn end faces of the continuous casting slab are blocked with high-temperature anti-oxidation paint, and the paint plugging covers at least 2 / 3 of the central surface of the ends.

[0046] The third step: the plugged continuous casting slab is placed in a heating furnace and heated to 1300 ° C, and the center reaches the set temperature and then is kept for 20 hours for homogenization treatment.

[0047] Step 4: The homogenized continuous casting billet is transferred to the operating tongs of the radial forging machine, and pre-cooled in the air for 2 to 5 minutes. When the surface temperature of the billet is 1200-1240, two passes of light hammer are carried out. For radial forgi...

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Abstract

The invention provides a process method for directly forging a continuous casting billet to produce die steel. The process method specifically includes the steps that the continuous casting billet ispretreated and homogenized at the temperature of 1,280 DEG C-1,320 DEG C for 20 h or longer; the homogenized continuous casting billet deforms at a small pressing ratio (10%-15%); and then the surfaceof a forging blank is cooled in a water spraying mode from one end of the forging blank at a normal radial forging rotary feeding speed, a hard shell is formed, and when the steel surface temperatureis 920 DEG C-980 DEG C, two-pass large pressing (the total pressing ratio is 45%-50%) heavy punch radial forging is carried out. Then a finishing pass with the small pressing amount of 4%-5% is set.The final forging temperature is 850 DEG C-900 DEG C. The product is obtained after grain refinement and annealing are completed. The continuous casting billet is specially treated, two times of hardshell radial forging are carried out, dynamic conditions beneficial for kneading of the center defect of the continuous casting billet are created, and continuous loose air holes and other defects inthe center of the continuous casting billet, decomposed liquation carbide and banded structures generated due to dendritic segregation are completely eliminated.

Description

technical field [0001] The invention relates to the field of special steel production, in particular to a process method for producing high-quality die steel by direct forging of continuous casting slabs. Background technique [0002] Die steels widely used at present are mainly made of cast ingots or electroslag ingots through homogenization-forging. Due to its central continuity (penetration) porosity, shrinkage cavity and other defects, the conventional heating → forging → grain refinement → annealing process cannot produce flawless mold steel materials. Compared with cast ingots and electroslag ingots, the advantages of smaller liquid precipitated carbides, relatively uniform structure, high yield and low cost of continuous casting slabs have not been brought into play. Using the invention, the continuous casting slab is used as the raw material, sawing the continuous casting slab, special pretreatment of the section → high temperature homogenization → light forging sur...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D9/70B21J5/00C21D1/32C21D1/70
CPCB21J5/002C21D1/32C21D1/70C21D8/005C21D9/70
Inventor 张亚彬冯英育庞于思朱喜达黎斌
Owner 江阴华润制钢有限公司
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