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Method for producing hot work mold steel adopting continuous casting billet direct forging

A technology of hot-working die steel and continuous casting slabs, which is applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve the problems of mold cracking and low mold life, achieve uniform quality, high microstructure quality, and optimize grain refinement and the effect of annealing conditions

Active Publication Date: 2019-06-18
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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  • Method for producing hot work mold steel adopting continuous casting billet direct forging
  • Method for producing hot work mold steel adopting continuous casting billet direct forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A process for producing high-quality hot work die steel by direct forging of continuous casting slabs:

[0052] Step 1: The annealed continuous casting slab is φ500mm (the steel type is H13 (4Cr5MoSiV1)), and the cutting length is 1200mm (length / diameter<2-3).

[0053] Step 2: The surfacing welding sealing of the two sawing end faces of the continuous casting slab, the surfacing welding range at the core of the section is at least half of the diameter of the continuous casting slab, that is, within the radius of the section φ250 mm, the thickness of the surfacing layer is at least 3 mm. After sealing and welding, the continuous casting slab is subjected to stress relief treatment at 450-600 ° C for 2 hours after the core is warmed. The welding wire material is low carbon steel or austenitic stainless steel, and the surfacing welding method can be arc welding, argon arc welding, laser cladding of pure iron powder, etc.

[0054] Step 3: The continuous casting slab after ...

Embodiment 2

[0060] Step 1: Annealed continuous casting billet φ650 mm (steel type and model is H13 (4Cr5MoSiV1)), sawing and cutting length is 1600 mm (length / diameter<2~3).

[0061] Step 2: The surfacing welding sealing of the two sawing end faces of the continuous casting slab, the surfacing welding range at the core of the section is at least half of the diameter of the continuous casting slab, that is, within the radius of the section φ325 mm, the thickness of the surfacing layer is at least 1 mm. After sealing and welding, the continuous casting slab is subjected to stress relief treatment at 550-750 ° C for 2 hours after the core is warmed. The welding wire material is low carbon steel or austenitic stainless steel, and the surfacing welding method can be arc welding, argon arc welding, laser cladding of pure iron powder, etc.

[0062] Step 3: The continuous casting slab after sealing and welding stress relief treatment is placed in a heating furnace and heated to 1200°C. After the ...

Embodiment 3

[0068] A process for producing high-quality hot work die steel by direct forging of continuous casting slabs:

[0069] Step 1: Annealed continuous casting billet φ390 mm (steel type and model is H13 (4Cr5MoSiV1)), sawing and cutting length is 1000 mm (length / diameter<2~3).

[0070] Step 2: The surfacing welding sealing of the two sawing end faces of the continuous casting slab, the surfacing welding range at the core of the section is at least half of the diameter of the continuous casting slab, that is, within the radius of the section φ185 mm, the thickness of the surfacing layer is at least 3 mm. The continuous casting slab after sealing and welding is subjected to stress relief treatment at 550-750°C for 2 hours after the core is warmed. The welding wire material is low carbon steel or austenitic stainless steel, and the surfacing welding method can be arc welding, argon arc welding, laser cladding of pure iron powder, etc.

[0071] Step 3: The continuous casting slab aft...

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Abstract

The invention provides a method for producing hot work mold steel adopting continuous casting billet direct forging. The method specifically comprises the steps that end face seal welding or overlaying is performed on a sawed and cut continuous casting billet, after that, first-time homogenization is performed, and the homogenization is performed for 3-6 h with the temperature being 1150-1320 DEGC; the surface of the continuous casting billet after the first-time homogenization is quenched to 1050 DEG C or below to perform one-way large press down ratio deformation, and second-time homogenization is performed for 10-20 h with the temperature being 1150-1320 DEG C; three-way forging is performed on the steel billet after the second-time homogenization; the initial forging temperature of the three-way forging is 1250 DEG C or below, and the final forging temperature is 800-950 DEG C; and a product is obtained through grain refining and annealing. According to the method for producing the hot work mold steel adopting the continuous casting billet direct forging, by means of organic combination of continuous casting billet special treatment, the two times of homogenization and two times of the forging, kinetic conditions favorable to diffusion of carbon and alloy elements are created, and continuous casting billet central continuity loose pores and other defects, decomposition liquid chromatography carbides and banded structures generated by 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 hot work die steel by direct forging of continuous casting slabs. Background technique [0002] The hot work die steel widely used at present is mainly made of cast ingot or electroslag ingot 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 continuous casting slab as the raw material, the invention can produce high quality, low Cost of hot work tool steel. [0003] The toughness and isotropy of hot work die ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B37/56B21B37/74B21B45/00C21D1/32C21D8/00C21D9/00
Inventor 张亚彬冯育英郭长华庞于思吕世建朱喜达莫攸建廖斌
Owner 江阴华润制钢有限公司
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