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Low-alloy wear-resisting cast steel material and preparation method thereof

A low-alloy, cast steel technology, applied in the field of metal material technology, can solve the problems of high manganese steel's special properties not being fully utilized, economic waste, etc., and achieve simple production and heat treatment methods, energy saving, and large economic benefits Effect

Inactive Publication Date: 2014-09-17
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some medium and low impact fields, the special properties of high manganese steel cannot be fully utilized, resulting in greater economic waste

Method used

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  • Low-alloy wear-resisting cast steel material and preparation method thereof
  • Low-alloy wear-resisting cast steel material and preparation method thereof
  • Low-alloy wear-resisting cast steel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A low-alloy wear-resistant cast steel material, which has the following alloy elements and mass percentages: C: 0.226%, Si: 0.443%, Mn: 0.876%, Ni: 0.371%, Mo: 0.339%, Nb: 0.039%; The amount is Fe.

[0018] A method for preparing a low-alloy wear-resistant cast steel material has the following processes and steps:

[0019] a. The alloy is prepared by using the method of arc melting to prepare the alloy, and it is annealed by high temperature diffusion; the alloy structure is ferrite, pearlite and a small amount of granular bainite;

[0020] b. Normalize the samples after high-temperature diffusion annealing, and the Brinell hardness after normalizing is 226HBS; The hardness reaches 207HBS, the tensile strength reaches 570MPa, the elongation reaches 22.3, and the friction rate reaches 2.69*10 -5 mg / Nm.

Embodiment 2

[0022] The preparation method of this embodiment is the same as that of Example 1, except that it has the following alloy elements and mass percentages: C: 0.338%, Si: 0.817%, Mn: 1.117%, Ni: 0.49%, Mo: 0.38%, Nb: 0.048%; the balance is Fe.

[0023] The Brinell hardness after normalizing is 263HBS; the sample after normalizing is tempered at 590°C, and the low-alloy wear-resistant cast steel material obtained after tempering has a Brinell hardness of 249HBS, a tensile strength of 665MPa, and an elongation of 19.56, friction rate 2.51*10 -5 mg / Nm.

Embodiment 3

[0025] The preparation method of this embodiment is the same as that of Example 1, except that it has the following alloy elements and mass percentages: C: 0.373%, Si: 0.884%, Mn: 1.229%, Ni: 0.612%, Mo: 0.467%, Nb: 0.041%; the balance is Fe.

[0026] The Brinell hardness after normalizing is 287HBS; the sample after normalizing is tempered at 590°C, and the low alloy wear-resistant cast steel material obtained after tempering has a Brinell hardness of 258HBS, a tensile strength of 701MPa, and an elongation of 16.55, the friction rate is 2.47*10 -5 mg / Nm.

[0027] Comparing the example with the previous experimental exploration, it is found that the hardness, strength and elongation of example 2 are higher, and the friction rate is lower at the same time, and the example 2 has higher comprehensive mechanical properties. Therefore, the cast steel material has the best composition ratio in the following composition; C: 0.35%, Si: 0.8%, Mn: 1.2%, Ni: 0.5%, Mo: 0.35%, Nb: 0.05%;...

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Abstract

The invention relates to a low-alloy wear-resisting cast steel material and a preparation method thereof. The material comprises the following alloy elements in percentage by weight: 0.2-0.4% of C, 0.4-1.0% of Si, 0.8-1.3% of Mn, 0.3-0.7% of Ni, 0.3%-0.5% of Mo, 0.03%-0.06% of Nb, and the balance of Fe. The preparation method has the following processes and steps: a, preparing alloy from materials by utilizing a method for preparing alloy through electric arc melting, and diffusing and annealing at a high temperature, wherein an alloy structure is ferrite, pearlite and a little granular bainite; b, normalizing a test sample which is diffused and annealed at a high temperature, wherein Brinell hardness after normalizing is 220-290 HBS, the normalized test sample is tempered at 590 DEG C, thereby obtaining the low-alloy wear-resisting cast steel material with Brinell hardness being not less than 200 HBS, tensile strength being not less than 550MPa, elongation being not less than 15% and frication rate being not greater than 2.7*10<-5>mg / Nm after normalizing. The material disclosed by the invention is applicable to a wear-resisting component of mining machinery, and has economic advantages such as good comprehensive mechanical performance, wide scope of application and low cost.

Description

technical field [0001] The invention relates to a low-alloy wear-resistant cast steel material and a preparation method thereof, belonging to the technical field of metal material technology. Background technique [0002] At present, wear-resistant materials for mining machinery usually stay in traditional high-alloy materials, such as high-manganese steel. However, in some medium and low impact areas, the special properties of high manganese steel cannot be fully utilized, resulting in greater economic waste. Therefore, in order to be able to design alloy materials with both high mechanical properties and good adaptability, this paper, on the basis of theoretical analysis, combined with numerical calculations, and with the help of vacuum arc melting button ingots, explores the alloy materials used in mining machinery. The effect of the alloy element content of cast steel on the mechanical properties of cast steel has obtained a group of ground alloy wear-resistant cast ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D6/00C21D1/30C21D1/28
Inventor 杨弋涛刘腾轼安立聪
Owner SHANGHAI UNIV