Steel material of hot-working die and its production process

A technology of hot work die steel and manufacturing process, which is applied in the field of metal materials and processing, and can solve the problems of plasticity, toughness, thermal conductivity, poor resistance to cold and heat fatigue and corrosion resistance, high cost of imported materials, and low mold repair rate. , to achieve the effect of avoiding brittle cracking, small deformation and good hardenability

Inactive Publication Date: 2011-10-19
尚宗文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, all countries in the world are constantly researching and developing new hot work mold materials. In view of the common hot work molds in my country, such as 5CrNiMo and 5CrMnMo, which have poor heat resistance, 3Cr2W8V (H21) steel has serious carbide segregation, plasticity, toughness, thermal conductivity, The cold and heat fatigue resistance and corrosion resistance are poor. The current H13 steel (4Cr5MoSiV1) new hot work die steel has a high tendency to crack when the die is used in the early stage, and the repair rate of the die is low. However, imported materials have problems such as high cost.

Method used

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  • Steel material of hot-working die and its production process
  • Steel material of hot-working die and its production process
  • Steel material of hot-working die and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Smelting process: select 1000 kg of high-quality scrap steel with a carbon content of 0.38wt.% as raw material for smelting. During the molten steel smelting process, when the molten steel in the intermediate frequency furnace melts 1 / 3, the furnace temperature is 1350-1450°C. Considering the burning loss rate, first put 88kg of chromium alloy and 4.0kg of molybdenum alloy to fully melt. Put 9.0kg of silicon alloy, 6.5Kg of ferromanganese alloy, and 16kg of vanadium alloy 10 minutes before the furnace is released, and then put in 2kg of silicon-calcium alloy deoxidizer to purify molten steel;

[0039](2) Cast molten steel into steel ingots: preheat the steel ingot mold at 200°C to 300°C, inject the molten steel at a slow and then fast and then slow injection speed, and at 300°C to 500°C, keep it warm for 60 minutes and then demould, and the steel ingot should be kept warm and cooled slowly (into quicklime or large-grained sand pit), exit the pit after 48 hours; stee...

Embodiment 2

[0048] (1) Smelting process: 1000 kg of high-quality scrap steel with a carbon content of 0.39 wt.% is selected as raw material for smelting. During the molten steel smelting process, when the molten steel in the intermediate frequency furnace melts 1 / 3, the furnace temperature is 1350-1450°C. Considering the burning loss rate, first put 89kg of chromium alloy and 4.2kg of molybdenum alloy to fully melt. Put 9.2kg of silicon-containing alloy, 6.8Kg of ferromanganese alloy, and 17kg of vanadium alloy 10 minutes before the furnace is released, and then put in 2kg of silicon-calcium alloy deoxidizer to purify molten steel;

[0049] (2) Cast molten steel into steel ingots: preheat the steel ingot mold at 200°C to 300°C, inject the molten steel at a slow and then fast and then slow injection speed, and at 300°C to 500°C, keep it warm for 60 minutes and then demould, and the steel ingot should be kept warm and cooled slowly (into quicklime or large-grained sand pit), exit the pit af...

Embodiment 3

[0055] (1) Smelting process: 1000 kg of high-quality scrap steel with a carbon content of 0.40wt.% is selected as a raw material for smelting. During the molten steel smelting process, when the molten steel in the intermediate frequency furnace melts 1 / 3, the furnace temperature is 1350-1450°C. Considering the burning loss rate, first put 90kg of chromium alloy and 4.4kg of molybdenum alloy to fully melt. Put 9.5kg of silicon-containing alloy, 7.0Kg of ferromanganese alloy, and 18kg of vanadium alloy 10 minutes before the furnace is released, and then put in 2kg of silicon-calcium alloy deoxidizer to purify molten steel;

[0056] (2) Cast molten steel into steel ingots: preheat the steel ingot mold at 200°C to 300°C, inject the molten steel at a slow and then fast and then slow injection speed, and at 300°C to 500°C, keep it warm for 60 minutes and then demould, and the steel ingot should be kept warm and cooled slowly (into quicklime or large-grained sand pit), exit the pit a...

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Abstract

The invention belongs to the metal material and processing technical field, which relates to a steel material of hot-working die and its production process. According to the invention, the steel material of hot-working die comprises the element components by weight percentages: 0.38 to 0.42 of C, 0.35 to 0.45 of Mn, 0.55 to 0.65 of Si, 5.0 to 5.5 of Cr, 0.2 to 0.25 of Mo, 1.0 to 1.5 of V, less than or equal to 0.025 of S, less than or equal to 0.025 of P and the balance of Fe. According to the invention, the production process comprises the following steps: a step of smelting technology, a step of casting molten steel to form steel ingot, a step of forging or rolling into sectional material and a step of spheroidizing sectional material and annealing process, so that the technical process is simple and the operation is easy to control. The invention has a good and scientific element ratio, alloying and modification processing are employed, the invention has the advantages of good heat stability, high heat resistant fatigue performance, wear resistance, good hardenability and less deformation, a vacuum heat treatment and a surface strengthening processing are added for improving the work efficiency, reducing production cost, reducing or avoiding dies from breaking and cracking, thereby the hot-working die has long service life, high performance-price ratio and wide application.

Description

technical field [0001] The invention belongs to the technical field of metal materials and processing, in particular to the scope of mold manufacturing and use, and relates to a hot work mold steel and a manufacturing process thereof. Background technique [0002] Mold is the basic process equipment for industrial production. In products such as electronics, automobiles, motors, electrical appliances, instruments, home appliances and communications, 60-80% of parts are formed by molds, so molds are called "the mother of all industries". . With the development and expansion of the mold market year by year, the consumption of mold steel, which is the material for producing molds, is also increasing significantly, and the consumption of hot work mold steel accounts for more than 30% of the mold steel products. With the rapid development of the mold industry, higher requirements are put forward for the service life and machining accuracy of hot work molds. The performance of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24
Inventor 尚宗文程渡明刘延亮巩蕾蕾崔泽岳
Owner 尚宗文
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