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Small-and-medium bainite steel wear resistance casting and preparing method thereof

A bainite steel, small and medium-sized technology, applied in the field of small and medium-sized wear-resistant castings and their preparation, can solve the problems of incompatibility between hardness and toughness, low service life of wear-resistant parts, technical difficulty and high material cost, and achieve consistent Excellent performance and stability, good overall mechanical properties, and reasonable ratio of ingredients

Inactive Publication Date: 2016-01-20
四川贝氏新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High manganese steel has high toughness (AKv>40J), but low hardness (HRC is about 20). The wear resistance advantage of high manganese steel is exerted through impact hardening under strong impact. Manganese Steel Meets Hardened Impact Requirements
High chromium cast iron has high hardness (HRC is 60), but low toughness (AKv<1J), high brittleness, and is only suitable for wear conditions with no impact and minimal impact, and such conditions are rare
Therefore, the use of high manganese steel and high chromium cast iron wear parts is severely limited, and because of poor comprehensive mechanical properties, the service life of wear parts is low
[0003] In recent years, low-alloy martensitic steel has been used as a material for small and medium-sized wear-resistant castings, which has better solved the problem that the hardness and toughness of high-manganese steel and high-chromium cast iron cannot be balanced. The main composition of the structure is martensite. Due to the poor hardenability of the material and the cracking during the martensitic phase transformation process, and in many cases, the lack of hardenability causes poor uniformity of the internal and external properties of the product. In order to prevent cracking and improve performance, on the one hand It is required to strictly control the heat treatment process, which greatly increases the difficulty of control. On the other hand, it needs to add a large amount of molybdenum and other alloying elements that increase hardenability, resulting in high technical difficulty and high material cost, which is extremely unfavorable for large-scale industrial production.

Method used

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  • Small-and-medium bainite steel wear resistance casting and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of small and medium sized bainite steel wear-resistant casting, its composition weight percentage is C: 0.2%, Si: 0.95%, Mn: 3.0%, Cr: 0.5%, the rest is iron and impurity elements, and it is carried out according to the following steps:

[0018] (1) Prepare raw materials according to the above ratio, and use conventional techniques for smelting, deoxidation, and slag removal;

[0019] (2) The blank is obtained by casting according to the sand mold process;

[0020] (3) Homogenization of the alloy: heat the blank to 850°C for 2 hours, then cool to room temperature with the furnace;

[0021] (4) Phase transformation: the blank is heated to 900°C and kept for 2 hours; out of the furnace, air-cooled to 650-750°C, then water-cooled to 300-350°C to discharge water, air-cooled to 100-150°C, heated to 220°C and kept for 4 hours, and the following data are obtained :

[0022] It can be seen that it has high hardness and impact resistance.

Embodiment 2

[0024] A kind of small and medium-sized bainite steel wear-resistant casting, its composition weight percentage is C: 0.34%, Si: 1.30%, Mn: 1.56%, Cr: 2.0%, the rest is iron and impurity elements, and it is the same as embodiment 1 The preparation steps were carried out to obtain the following data:

[0025]

[0026] It can be seen that it has high hardness and impact resistance.

Embodiment 3

[0028] A kind of small and medium-sized bainite steel wear-resistant casting, its composition weight percent is: C: 0.5%, Si: 2.0%, Mn: 1.80%, Cr: 1.23%, the rest is iron and impurity elements, and according to embodiment 1 The same preparation steps were carried out to obtain the following data:

[0029]

[0030] It can be seen that it has high hardness and high impact resistance.

[0031] The hardness (HRC) and impact (AKv) used in the present invention are tested according to GB / T230.1-2009 and GB / T229-2010 standards.

[0032] Compared with the relevant parameters of other wear-resistant materials, the results are:

[0033]

[0034] It can be seen from the above data that using the medium and small bainitic steel wear-resistant castings provided by the present invention, due to the reasonable composition ratio, the casting products not only have high hardness, but also have high impact toughness, and realize the best comprehensive mechanical strength. High performan...

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PUM

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Abstract

The invention discloses a small-and-medium bainite steel wear resistance casting and a preparing method thereof. C, Si, Mn and Cr serve as main alloy elements of the casting. The casting comprises, by weight, 0.2-0.5% of C, 0.6-2.0% of Si, 1.5-3.0% of Mn, 0.5-2.0% of Cr and the balance iron and impurity elements. The wear resistance casting is a small-and-medium piece, and the composition proportion is reasonable. In the thermal treatment process of the casting, a complex phase organization with a certain content of bainite or martensite or retained austenite or other else can be formed within the wide cooling rate range, and a casting product has very high hardness and also has very high impact tenacity, and optimal comprehensive mechanical performance is achieved. The problems of thermal treatment cracks and hardenability are solved through the matched alloy homogenization treatment and quenching process, and accordingly consistency and stability of performance of the casting product are achieved. The material cost is low, the technology is stable, and the large-scale industrial production is easy to achieve.

Description

technical field [0001] The invention relates to a novel bainitic steel wear-resistant casting and a preparation method thereof, in particular to a small and medium-sized wear-resistant casting weighing less than 50Kg and a preparation method thereof. Background technique [0002] At present, the small and medium-sized wear-resistant castings used in industrial production are mainly high manganese steel and high chromium cast iron. High manganese steel has high toughness (AKv>40J), but low hardness (HRC is about 20). The wear resistance advantage of high manganese steel is exerted through impact hardening under strong impact. Manganese steel meets hardened impact requirements. High chromium cast iron has high hardness (HRC is 60), but low toughness (AKv<1J) and high brittleness. It is only suitable for wear conditions with no impact and minimal impact, and there are few such conditions. Therefore, the application fields of high manganese steel and high chromium cast i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C33/04
Inventor 余忠友谭谆礼汪慧莲白秉哲胡万谦杨华榆罗平伍大全
Owner 四川贝氏新材料有限公司