Niobium microalloyed high strength hot work die steel and preparation thereof

A technology of hot work die steel and microalloying, which is applied in the field of alloy steel manufacturing technology, and can solve problems such as insignificant effect, poor thermal fatigue resistance, and thermal wear

Inactive Publication Date: 2008-11-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

5CrNiMo and 5CrMnMo, due to their low thermal strength, are likely to cause the collapse of the working part of the mold and thermal wear and thermal fatigue under impact stress, so they are not suitable for manufacturing hot-working molds with large sizes and high working temperatures
3Cr2W8V has good thermal hardness, but its thermal fatigue...

Method used

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  • Niobium microalloyed high strength hot work die steel and preparation thereof
  • Niobium microalloyed high strength hot work die steel and preparation thereof
  • Niobium microalloyed high strength hot work die steel and preparation thereof

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Embodiment 1

[0035] In this example, the composition and weight percentage of the hot work die steel are as follows:

[0036] C 0.46%, Si 0.26%, Mn 0.45%, Cr 4.48%, Mo 2.88%,

[0037] V 0.56%, Nb 0.063%, P 0.015%, S 0.015%, Fe balance.

[0038] In the present embodiment, the technical process and steps of hot work die steel are as follows:

[0039] a. Induction smelting: smelting in an intermediate frequency induction furnace according to the above-mentioned ratio of alloying elements, the melting temperature is greater than 1500°C, and then cast into Φ80mm steel ingots and air-cooled;

[0040] b. Electroslag remelting: put the above-mentioned steel ingot as a consumable electrode in an electroslag remelting device for secondary refining; use electric current to generate resistance heat through the electroslag layer to melt the alloy steel base material of the consumable electrode, liquid The metal falls through the slag layer of the slag pool in the form of molten droplets to the water-...

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Abstract

The invention relates to niobium microalloyed high-strength hot working die steel, belonging to the alloy steel manufacturing process technical field. The compositions by weight percentage of the steel are: 0.3 to 0.6 percent of C, 0.1 to 0.5 percent of Si, 0.1 to 0.5 percent of Mn, 4.0 to 6.5 percent of Cr, 1.0 to 3.5 percent of Mo, 0.4 to 1.4 percent of V, 0.02 to 0.10 percent of Nb, less than 0.03 percent of P, less than 0.03 percent of S, and the balance being Fe. The process for preparing the hot working die steel comprises the following steps of: batching, smelting, secondary refining and electroslag remelting; homogenizing the mixture for 5 to 10 hours at a temperature of between 1210 and 1300 DEG C, and forging, annealing, quenching and tempering the mixture; heating up the mixture to a temperature of between 1000 and 1100 DEG C for austenization, after performing 'step heating' at a temperature of 650 DEG C and at a temperature of 800 DEG C, then performing secondary tempering to the processed mixture, and finally acquiring the hot working die steel. The die steel has the advantages of good thermal resistance, good thermal stability and good thermal fatigue performance.

Description

technical field [0001] The invention relates to a niobium micro-alloyed high-strength hot work die steel and a preparation method thereof. The die steel has high strength and high thermal stability, good toughness and thermal fatigue performance, and belongs to the technical field of alloy steel manufacturing technology. Background technique [0002] In the field of hot work die steel, the steel types widely used in China are 5CrNiMo, 5CrMnMo, 3Cr2W8V and H13 steel. Due to the particularity of the working conditions of hot work die steel, the performance requirements for hot work die steel are also very strict. Due to their low thermal strength, 5CrNiMo and 5CrMnMo are likely to cause the collapse of the working part of the mold, thermal wear and thermal fatigue under impact stress, and are not suitable for manufacturing hot-working molds with larger sizes and higher working temperatures. 3Cr2W8V has good thermal hardness, but its thermal fatigue resistance is poor, and the...

Claims

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Application Information

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IPC IPC(8): C22C38/26C22C33/04C21D1/26C21D1/18
Inventor 闵永安宋雯雯吴晓春张海东
Owner SHANGHAI UNIV
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