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High performance hot work die steel for large section die casting and its preparation process

A technology for hot work die steel and preparation process, applied in the field of alloy steel, can solve the problems of reducing product yield and manufacturing capacity, low high temperature strength, low impact toughness of materials, etc., so as to improve high temperature service performance and improve thermal stability. the effect of increasing the carbon content

Active Publication Date: 2016-05-11
RUGAO HONGMAO HEAVY FORGING
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

4Cr5MoSiV1 steel is the most widely used hot work die steel, but its high temperature strength is not very high, the general use temperature can not exceed 540 ℃, and the thermal fatigue resistance and thermal stability are not high
This preparation process has the following problems: 1) The size of the electroslag ingot is small, and the small ingot size reduces the yield and manufacturing capacity of the product; 2) The original structure of the electroslag ingot has a large number of large particles or massive liquefied carbonization 3) The grain size of the material after forging is coarse, resulting in low impact toughness of the material after quenching and tempering, and the product grade is low, which cannot meet the market demand for large cross-section, high toughness, and high heat. The Need for Strong Hot Work Die Steels

Method used

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  • High performance hot work die steel for large section die casting and its preparation process
  • High performance hot work die steel for large section die casting and its preparation process
  • High performance hot work die steel for large section die casting and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this example, the components and mass percentages of the high-performance hot-work die steel for large-section die-casting are as follows:

[0056] C0.65%, Si1.00%, Mn1.00%, Cr5.50%,

[0057] Mo3.00%, V0.80%, P0.015%, S0.007%,

[0058] Ni2.00%, Nb0.20%, Fe balance.

[0059] The technical process and steps of producing hot work die steel with the material in this embodiment are as follows:

[0060] A electric furnace smelting: melting in an electric arc furnace according to the ratio of alloying elements in the above-mentioned embodiments, the melting temperature is higher than 1500°C, casting into φ400mm~φ450mm electrode rods and cooling in air.

[0061] B Electroslag remelting: Place the poured steel ingot as a consumable electrode in the electroslag remelting device for electroslag remelting. The slag melting voltage is 56-62V, the current is 3000-5000A, and the voltage of the electricity system is 57 ~59V, current 11000~12000A, capping voltage 57~59V, current t...

Embodiment 2

[0085] In this example, the components and mass percentages of the high-performance hot-work die steel for large-section die-casting are as follows:

[0086] C0.47%, Si0.30%, Mn0.40%, Cr4.80%,

[0087] Mo2.40%, V0.50%, P0.007%, S0.003%,

[0088] Ni1.50%, Nb0.18%, Fe balance.

[0089] The process and steps of producing hot work die steel using the materials in this embodiment are the same as in Embodiment 1, and will not be repeated here.

[0090] After the above-mentioned smelting, thermal processing and heat treatment of the hot work die steel in this embodiment, the final product specification is 500mm*800mm*4000mm module, and the performance test is carried out by sampling, and the analysis results are as follows:

[0091] A phase transition point:

[0092] Ac1, Ac3, and Ms point test results were 831°C, 957°C, and 307°C, respectively.

[0093] B tempering characteristics:

[0094] The characteristic curve of tempering hardness changing with tempering temperature after...

Embodiment 3

[0107] In this example, the components and mass percentages of the high-performance hot-work die steel for large-section die-casting are as follows:

[0108] C0.45%, Si0.50%, Mn0.70%, Cr3.50%,

[0109] Mo2.00%, V0.60%, P0.001%, S0.005%,

[0110] Ni1.00%, Nb0.17%, Fe balance.

[0111] The process and steps of using the materials in this embodiment to produce hot work die steel are the same as those in Embodiment 1, and will not be repeated here.

[0112] After the hot work die steel of the present invention is through the above-mentioned smelting, thermal processing and heat treatment, the final finished product specification is 500mm*800mm*4000mm module, sampling is carried out performance test, and analysis result is:

[0113] A phase transition point:

[0114] Ac1, Ac3, and Ms point test results were 831°C, 962°C, and 306°C, respectively.

[0115] B tempering characteristics:

[0116] The characteristic curve of tempering hardness changing with tempering temperature aft...

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Abstract

The invention relates to large-section high-performance hot work die steel for die casting and a preparation technology thereof and belongs to the technical field of an alloy steel preparation technology. The steel is characterized in that main alloy elements in alloy chemical components comprise, by weight, 0.35-0.65% of C, 0.30-1.00% of Si, 0.30-1.00% of Mn, 3.50-5.50% of Cr, 2.00-3.00% of Mo, 0.40-0.80% of V, P being less than or equal to 0.02%, S being less than or equal to 0.01%, 1.00-2.00% of Ni, Nb being greater than or equal to 0.15%, and the balance Fe. The preparation process of the hot work die steel comprises the following steps: burdening, smelting, casting and electroslag remelting; heat treatment by high-temperature heat diffusion, hot working by multi-directional forging and controlled cooling after forging; refining and heat treatment of proeutectoid carbide and isothermal annealing treatment; and heat treatment by quenching and tempering, namely austenitizing by heating to 950-1100 DEG C, oil cooling or mist cooling, and tempering at 540-630 DEG C for two to three times. The hot work die steel provided by the invention has advantages of high hardenability, high thermal stability, high toughness and good resistance to thermal fatigue.

Description

technical field [0001] The invention relates to a hot work die steel, in particular to a high-performance hot work die steel for large-section die-casting, and also to a preparation process for the hot work die steel, which belongs to the technical field of alloy steel. Background technique [0002] Hot work die steel is a die steel used at relatively high temperature, among which Cr, Mo, W, V and other alloy elements usually play a role in high temperature heat strength and thermal stability, so some current research work is mainly adjustments to these alloying elements. The study found that the addition of a higher content of Mo element can improve the thermal fatigue resistance and temper softening resistance of the steel, and the addition of a certain amount of Ni element can greatly improve the hardenability of the steel, making the effective thickness of the steel section Greatly increased, so that it can be used to manufacture hot work die steel with larger sections,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C21D8/00
Inventor 周青春徐卫明吴晓春顾金才钱强王小飞丁勇刘鑫杨怡祖
Owner RUGAO HONGMAO HEAVY FORGING
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