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Powder metallurgy wear-resistant tool steel

a tool steel and powder metallurgy technology, applied in the field of tool steel, can solve the problems of reduced toughness, fracture under relatively low external load, and limited performance of tool steel prepared by casting and forging processes, and achieve excellent performan

Active Publication Date: 2019-08-20
HEYE SPECIAL STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The powder metallurgy tool steel achieves improved impact toughness, bending strength, and hardness, with finer carbides and controlled oxygen content, resulting in a product with enhanced wear resistance and extended service life, surpassing conventional tool steels in performance.

Problems solved by technology

Coarse carbides in the steel will cause stress concentration, which reduces the toughness of the tool steel, resulting in fracture under a relatively low external load.
Conventionally, the tool steel is mainly casted and forged by traditional production processes, wherein the tool steel prepared by casting and forging processes is limited by liquid steel which is slowly cooled during the processes.
Even after subsequent forging and rolling processes, such bad structure will still adversely affect the performance of the alloy, resulting in low performances of the tool steal in strength, toughness, wear resistance and grinding performance, which is difficult to meet material performance and life stability requirements of high-end manufacturing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

Preferred Embodiment 1

[0050]The preferred embodiment 1 refers to a group of powder metallurgy wear-resistant tool steels, whose chemical components are listed in Table 1.1:

[0051]

TABLE 1.1chemical components of powder metallurgy wear-resistanttool steels in the preferred embodiment 1CSiMnCrMoWVNbCoSNOembodiment 1.12.9810.64.571.30.112.430.30.0010.080.008embodiment 1.23.380.890.35.261.80.113.11.150.30.0010.060.0078embodiment 1.33.981.51.35.452.40.715.92.60.40.0050.50.008embodiment 1.43.500.61.04.861.50.514.51.80.240.0030.30.008

[0052]The powder metallurgy wear-resistant tool steels are prepared with a method comprising steps of:

[0053]a) loading liquid tool steal of the present invention into a smelting ladle with a load weight of 1.5-8 ton;

[0054]b) electrically heating covering slag at a top surface of the liquid steel in the smelting ladle by graphite electrodes, injecting argon or nitrogen gas from a hole at a bottom of the smelting ladle for stirring the liquid steel, opening a guid...

embodiment 2

Preferred Embodiment 2

[0061]The preferred embodiment 2 proves heat treatment hardness, impact toughness, bending strength, wear resistance, carbide content and particle size of the powder metallurgy wear-resistant tool steel of the preferred embodiment 1, wherein the carbide content and the particle size is analyzed based on structure images obtained by scanning electron microscope; and the heat treatment hardness, the impact toughness, the bending strength and the wear resistance are tested referring to GB / T 230.1, GB / T 229, GB / T 14452-93, and GB / T 12444-2006.

[0062]The powder metallurgy wear-resistant tool steel of the embodiments 1.1 and 1.2 are compared with a powder metallurgy tool steel (alloy A) and a forged tool steel (alloy B) bought, wherein results are as follows:

[0063]

TABLE 2.1components comparison between embodiment 1.1, embodiment 1.2, alloy A, and alloy BCSiMnCrMoWVNbCoSNOembodiment 1.12.9810.64.571.30.112.430.30.0010.080.008embodiment 1.23.380.890.35.261.80.113.11.150...

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Abstract

A powder metallurgy wear-resistant tool steel includes chemical components by mass percent of: V: 12.2%-16.2%, Nb: 1.1%-3.2%, C: 2.6%-4.0%, Si: ≤2.0%, Mn: 0.2%-1.5%, Cr: 4.0%-5.6%, Mo: ≤3.0%, W: 0.1%-1.0%, Co: 0.05%-0.5%, N: 0.05%-0.7%, with balance iron and impurities; wherein a carbide component of the powder metallurgy wear-resistant tool steel is an MX carbide with a NaCl type face-centered cubic lattice structure; wherein an M element of the MX carbide comprises V and Nb, and an X element comprises C and N.

Description

CROSS REFERENCE OF RELATED APPLICATION[0001]This is a U.S. National Stage under 35 U.S.C. 371 of the International Application PCT / CN2015 / 091285, filed Sep. 30, 2015, which claims priority under 35 U.S.C. 119(a-d) to CN 201510250891.0, filed May 15, 2015.BACKGROUND OF THE PRESENT INVENTION[0002]Field of Invention[0003]The present invention relates to tool steel, and more particularly to a powder metallurgy wear-resistant tool steel.[0004]Description of Related Arts[0005]Tool steel is widely used in manufacturing field. For a long service life of a tool made of the tool steel, the tool steel should be sufficient in wear resistance, impact toughness, bending strength and hardness. Under normal conditions of use, wear resistance determines the length of service life. Wear resistance of the tool steel depends on the matrix hardness, as well as content, morphology and particle size distribution of the second hard phase in the steel. The second hard phase in the steel comprises M6C, M2C, ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C22C33/02C22C38/24C22C38/22C22C38/30C22C38/26C22C38/00C22C38/02C22C38/10C22C38/16C22C45/02B22F1/00H01F1/147H01F1/153H01F1/20C22C38/36C22C38/04B22F9/08B22F3/15B22F5/00
CPCC22C38/36B22F3/15B22F9/082C22C33/0278C22C38/001C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/30B22F1/0003B22F2998/10B22F2005/002B22F2009/0824B22F2009/0848B22F2009/0876B22F2201/02B22F2301/35B22F1/00
Inventor LI, XIAOMINGWU, LIZHIZHONG, HAILINWANG, XUEBINGKUANG, CHUNJIANGFANG, YUCHENG
Owner HEYE SPECIAL STEEL