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Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof

A technology for hot work die steel and thermal fatigue resistance, which is applied in the field of thermal fatigue resistance and high performance hot work die steel and its manufacturing process. problem, to achieve the effect of excellent hardenability

Inactive Publication Date: 2016-01-27
RUGAO HONGMAO HEAVY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This manufacturing 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 large blocks of 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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  • Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof
  • Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof
  • Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The matrix of thermal fatigue-resistant high-performance hot work die steel is composed of the following components in mass percentage: C0.30%, Si0.30%, Mn0.60%, Cr4.00%, Mo1.80%, W0.70%, V0.50%, P0.003%, S0.01%, Nb0.12%; the rest is Fe.

[0051] A manufacturing process of thermal fatigue-resistant high-performance hot work die steel has the following steps:

[0052] Step A. Smelting: Smelting in an electric arc furnace according to the above composition, the melting temperature is greater than 1500°C, casting into a Ф400mm~Ф450mm steel ingot and air cooling; the cast steel ingot is placed in the electroslag remelting device as a consumable electrode In the middle, carry out electroslag remelting, the slag melting voltage is 56~62V, the current is 3000~5000A, the electric system voltage is 57~59V, the current is 11000~12000A, the capping voltage is 57~59V, lasts for 35~50 minutes, and the electroslag remelting is 1000Kg ~15000Kg steel ingot;

[0053] Step B. High-temp...

Embodiment 2

[0060] The matrix of thermal fatigue-resistant high-performance hot work die steel is composed of the following components in mass percentage: C0.25%, Si0.35%, Mn0.70%, Cr4.00%, Mo1.80%, W0.60%, V0.40%, P0.01%, S0.003%, Nb0.10%; the rest is Fe.

[0061] A manufacturing process of thermal fatigue-resistant high-performance hot work die steel has the following steps:

[0062] Step A. Smelting: Smelting in an electric arc furnace according to the above composition, the melting temperature is greater than 1500°C, casting into a Ф400mm~Ф450mm steel ingot and air cooling; the cast steel ingot is placed in the electroslag remelting device as a consumable electrode In the middle, carry out electroslag remelting, the slag melting voltage is 56~62V, the current is 3000~5000A, the electric system voltage is 57~59V, the current is 11000~12000A, the capping voltage is 57~59V, lasts for 35~50 minutes, and the electroslag remelting is 1000Kg ~15000Kg steel ingot;

[0063] Step B. High-temp...

Embodiment 3

[0070] The matrix of thermal fatigue-resistant high-performance hot work die steel is composed of the following components in mass percentage: C0.15%, Si0.32%, Mn0.50%, Cr4.00%, Mo1.50%, W0.50%, V0.60%, P0.01%, S0.01%, Nb0.10%; the rest is Fe.

[0071] A manufacturing process of thermal fatigue-resistant high-performance hot work die steel has the following steps:

[0072] Step A. Smelting: Smelting in an electric arc furnace according to the above composition, the melting temperature is greater than 1500°C, casting into a Ф400mm~Ф450mm steel ingot and air cooling; the cast steel ingot is placed in the electroslag remelting device as a consumable electrode In the middle, carry out electroslag remelting, the slag melting voltage is 56~62V, the current is 3000~5000A, the electric system voltage is 57~59V, the current is 11000~12000A, the capping voltage is 57~59V, lasts for 35~50 minutes, and the electroslag remelting is 1000Kg ~15000Kg steel ingot;

[0073] Step B. High-tempe...

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Abstract

The invention relates to thermal fatigue resisting and high performance hot working die steel and a manufacturing process thereof and belongs to the technical field of alloy steel manufacturing processes. A base body of the thermal fatigue resisting and high performance hot working die steel is composed of, by mass, 0.15-0.30% of C, 0.00-0.40% of Si, 0.30-1.00% of Mn, 3.50-4.50% of Cr, 1.50-2.00% of Mo, 0.20-1.00% of W, 0.40-0.80% of V, 0.00-0.02% of P, 0.00-0.02% of S, 0.00-0.15% of Nb and the balance Fe. The manufacturing process of the thermal fatigue resisting and high performance hot working die steel comprises the steps that burdening, smelting, casting, then electroslag remelting, high temperature heat diffusion heat treatment, then multidirectional forging heat machining and post-forging control cooling are conducted; secondary carbide refining heat treatment and isothermal annealing processing are conducted; finally, quenching and tempering heat processing are conducted, the steel is heated to be 950-1100 DEG C for austenitizing, and two to three times of tempering are conducted at the temperature of 540-630 DEG C after oil cooling or mist cooling. The hot working die steel has high thermal fatigue resistance, high thermal stability and high toughness.

Description

technical field [0001] The invention relates to a die steel and its manufacturing process, in particular to a thermal fatigue-resistant high-performance hot work die steel and its manufacturing process. The die steel makes full use of the alloying characteristics of Cr-Mo-W-V-Nb multi-alloy elements , to ensure high hardenability, high temperature thermal stability and thermal fatigue performance of the steel, not only can make the steel use temperature above 600 ℃, but also have higher thermal stability, good toughness and thermal fatigue performance than H13 steel, which belongs to Alloy steel technology field. Background technique [0002] Hot work die steel is a die steel used at higher temperatures (generally higher than 500 ° C), in which the alloying elements that play high temperature thermal strength and thermal stability are usually Cr, Mo, V and other alloying elements, so the current Some of the research work is mainly on the adjustment of these alloying element...

Claims

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Application Information

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IPC IPC(8): C22C38/26C22C33/04
Inventor 周青春徐卫明顾金才葛建辉钱强赵博伟丁勇王小飞任志强
Owner RUGAO HONGMAO HEAVY FORGING
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