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A production process of high-strength and high-toughness high-speed rail brake pads

A production process, high toughness technology, applied in the field of casting process, can solve the problems of unqualified material, poor toughness, unstable process and so on

Active Publication Date: 2022-02-15
HEBEI YULONG CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-speed rail brake pads usually use QT500-7 materials and QT400-18L materials, and ductile iron has the following problems, which limit its application on high-speed rail brake pads, for example: the tensile strength of ductile iron ≥ 600Mpa, the extension Ratio ≥ 3%, high tensile strength, but low elongation, poor toughness, and unstable process, unable to meet the requirements of strength and elongation at the same time, prone to unqualified materials such as high tensile strength and low elongation Qualified; 2), internal defects such as shrinkage and porosity are prone to occur, which cannot meet the requirements of the standard, resulting in batch waste

Method used

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Experimental program
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Embodiment 1

[0075] 1. Melting process

[0076] 1. Material selection

[0077] (1) The pig iron adopts pig iron Q10 for high-quality nodular cast iron;

[0078] The specific requirements for pig iron Q10 for high-quality ductile iron are as follows:

[0079] One class one group;

[0080] C>3.4%, Si0.5-1%, Mn<0.1%, S≤0.03%, P≤0.035%, Ti≤0.03%;

[0081] The sum of impurity elements Cr, V, Pb, Bi, As, B, Al, Mo, Sb≤0.085%;

[0082] Surface quality: clean surface, no slag, no sand, no rust, uniform lumpiness;

[0083] Fix the pig iron supplier, and do not change the pig iron supplier at will after the production is stable.

[0084] Among them, the requirements for trace elements that hinder graphitization are strictly limited as follows: S≤0.03%, P≤0.035%, Ti≤0.03%, V<0.0007%, Al<0.005%, B<0.0005%, Sb<0.0005%.

[0085] (2) Scrap steel is made of high-quality carbon structural steel;

[0086] The requirements for the high-quality carbon structural steel are as follows:

[0087] Chemical...

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Abstract

The invention relates to a production process of high-strength and high-toughness high-speed rail brake pads, specifically comprising the following steps: 1. Smelting process: 1. Raw material preparation; 2. Smelting; 2. Spheroidizing and inoculating process: 1. Spheroidizing; 2. Out of molten iron, 3, slag removal for the first time, 4, ladle inoculation, 5, slag removal treatment for the second time; 3, casting process; 4, heat treatment process; 5, machining process; Parameters such as material selection, proportioning and adding sequence and adding method, so as to control the chemical composition after the furnace within the ideal range, so that the metallographic detection index of the cast product is excellent, the mechanical performance is outstanding, the process is stable, and the scrap rate is low. Meet the production requirements of high-speed rail gates.

Description

technical field [0001] The invention belongs to the field of casting technology, and in particular relates to a production technology of high-strength and high-toughness high-speed rail brake pads. Background technique [0002] High-speed rail brake pads usually use QT500-7 materials and QT400-18L materials, and ductile iron has the following problems, which limit its application on high-speed rail brake pads, for example: the tensile strength of ductile iron ≥ 600Mpa, the extension Ratio ≥ 3%, high tensile strength, but low elongation, poor toughness, and unstable process, unable to meet the requirements of strength and elongation at the same time, prone to unqualified materials such as high tensile strength and low elongation Qualified; 2), internal defects such as shrinkage and porosity are prone to occur, which cannot meet the requirements of the standard, resulting in batch waste. Contents of the invention [0003] The purpose of the present invention is to overcome ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/10C21C1/10C22C37/04C22C37/08C22C37/10C21D1/00B22D1/00B22C9/02B23P15/00
CPCC22C33/10C21C1/10C22C37/04C22C37/10C22C37/08C21D1/00B22C9/02B22D1/00B23P15/00Y02P10/20
Inventor 张连会崔朝飞
Owner HEBEI YULONG CASTING
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