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Production method of high-toughness high-isotropy large-section hot working die steel

A hot-working die steel and production method technology, applied in the field of steel casting, can solve problems such as low die life and die cracking, and achieve the effects of uniform quality, optimized time difference, and elimination of carbides and segregation

Inactive Publication Date: 2015-12-23
冯英育
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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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  • Production method of high-toughness high-isotropy large-section hot working die steel
  • Production method of high-toughness high-isotropy large-section hot working die steel

Examples

Experimental program
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Effect test

Embodiment 1

[0045]A production method of high toughness, high isotropic large section hot work die steel:

[0046] Step 1: After electroslag remelting, the annealed steel ingot (the material type is H13 (4Cr5MoSiV1)) is placed in a heating furnace and heated to 1260 ° C. After the center reaches the set temperature, it is kept for 5 hours to complete the first homogenization.

[0047] Step 2: Start three-direction strong forging at an initial forging temperature of 1260°C and a final forging temperature of 900°C. The forging sequence is as follows figure 1 As shown, that is, steel ingot upsetting → X direction upsetting → Y direction chamfering upsetting → Z direction elongation, the upsetting deformation rate of each direction is above 40%, except for the finishing pass, the compression of each pass The down rate is above 15%.

[0048] Step 3: The steel billet that has been strongly forged in three directions continues to be heated to the homogenization temperature. After the center of ...

Embodiment 2

[0052] A production method of high toughness, high isotropic large section hot work die steel:

[0053] Step 1: After electroslag remelting, the annealed steel ingot (the material type is H13 (4Cr5MoSiV1)) is placed in a heating furnace and heated to 1300 ° C. After the center reaches the set temperature, it is kept for 8 hours to complete the first homogenization.

[0054] Step 2: Start three-direction strong forging at an initial forging temperature of 1300°C and a final forging temperature of 900°C. The forging sequence is: steel ingot upsetting → X direction upsetting → Y direction chamfering upsetting → Z direction elongation, The upsetting deformation rate in each direction is above 50%; except for the finishing pass, the reduction rate of each pass is above 20%.

[0055] Step 3: The steel billet that has been strongly forged in three directions continues to be heated to the homogenization temperature. After the center of the billet reaches 1300 ° C, it is kept for 20 ho...

Embodiment 3

[0059] A production method of high toughness, high isotropic large section hot work die steel:

[0060] Step 1: After electroslag remelting, the annealed steel ingot (the material type is H418 (4Cr5Mo2V)) is placed in a heating furnace and heated to 1280 ° C. After the center reaches the set temperature, it is kept for 6 hours to complete the first homogenization.

[0061] Step 2: Start three-direction strong forging at an initial forging temperature of 1260°C and a final forging temperature of 900°C. The forging sequence is: steel ingot upsetting → X direction upsetting → Y direction chamfering upsetting → Z direction elongation, The upsetting deformation rate in each direction is above 50%; except for the finishing pass, the reduction rate of each pass is above 20%.

[0062] Step 3: The steel billet that has been strongly forged in three directions continues to be heated to the homogenization temperature. After the center of the billet reaches 1280 ° C, it is kept for 20 hou...

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Abstract

The invention provides a production method of high-toughness high-isotropy large-section hot working die steel. The method comprises the following steps: carrying out primary homogenization on a steel ingot subjected to electroslag remelting at 1260-1300 DEG C for 5-8 hours; carrying out three-way forging on the steel ingot subjected to primary homogenization at the temperature of 900 DEG C or above, wherein the three-way forging temperature is lower than the first homogenization temperature; carrying out secondary homogenization on the steel billet subjected to three-way forging at 1260-1300 DEG C for 10-20 hours; carrying out upsetting and rolling finish forging on the steel billet subjected to secondary homogenization, wherein the initial forging temperature of the upsetting and rolling finish forging is 1150 DEG C or below, and the finish forging temperature is 850-950 DEG C; and carrying out grain refinement and annealing to obtain the product. By organically combining the double homogenization and double forging, the method creates dynamic conditions beneficial to carbon and alloy element diffusion, and thoroughly eliminates the liquation carbides in the steel billet and the zonal structures generated by dendritic segregation.

Description

technical field [0001] The invention relates to the field of cast steel, in particular to a method for producing hot work die steel with high toughness and high isotropy and large cross-section. Background technique [0002] The toughness and isotropy of hot work die steel widely used at present cannot meet the ever-changing technical requirements. Especially in large-scale die-casting, large-section non-ferrous metal (aluminum alloy) extrusion, and precision forging molds, with the development of equipment automation and intelligence, the working conditions of molds are getting worse and worse, and the life of molds cannot meet market demand. The production of high-toughness, high isotropic large-section hot-work die steel as raw materials to manufacture high-quality, long-life large-scale hot-work dies is the demand for the development of modern automobiles, electronic appliances, and rail transportation industries. [0003] Hot work die steel usually contains Cr, Mo, V a...

Claims

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Application Information

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IPC IPC(8): C21D8/00
Inventor 冯英育
Owner 冯英育
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