Unlock instant, AI-driven research and patent intelligence for your innovation.

A heat treatment method for steel for brake discs of high-speed trains containing tungsten

A heat treatment method, high-speed train technology, applied in the direction of brake discs, brake parts, brake types, etc., can solve the problem of less innovative research on materials, and achieve the effects of improving service performance, excellent high-temperature strength, and excellent thermal conductivity

Active Publication Date: 2019-12-03
MAGANG (GROUP) HOLDING CO LTD +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the current research focuses on innovating the structure of the brake disc and improving the heat dissipation of the brake disc, and there are relatively few innovative studies on the material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A heat treatment method for steel for brake discs of high-speed trains containing tungsten
  • A heat treatment method for steel for brake discs of high-speed trains containing tungsten
  • A heat treatment method for steel for brake discs of high-speed trains containing tungsten

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A heat treatment method for steel for a tungsten-containing high-speed train brake disc, comprising the following steps:

[0042] (1) Normalizing process: heat the tungsten-containing high-speed train brake disc steel to 1100°C at a heating rate of 50°C / h, keep it warm for 5 hours, and then air-cool it to below 300°C;

[0043] (2) Quenching process: After normalizing, the tungsten-containing high-speed train brake disc steel is heated to 1020°C at a heating rate of 50°C / h, and then water-cooled to below 100°C after holding for 4 hours;

[0044] (3) Tempering process: heat the tungsten-containing high-speed train brake disc steel after quenching to 650°C at a heating rate of 50°C / h, and water-cool to below 100°C after 5 hours of heat preservation.

[0045] The preparation process of tungsten-containing high-speed train brake disc steel is as follows: electric arc furnace or converter smelting→LF furnace refining→RH or VD vacuum degassing→continuous casting→slab heating f...

Embodiment 2

[0051] A heat treatment method for steel for a tungsten-containing high-speed train brake disc, comprising the following steps:

[0052] (1) Normalizing process: heat the tungsten-containing high-speed train brake disc steel to 1065°C at a heating rate of 68°C / h, keep it warm for 6 hours, and then air-cool it to below 300°C;

[0053] (2) Quenching process: After normalizing, the tungsten-containing high-speed train brake disc steel is heated to 1010°C at a heating rate of 68°C / h, and then water-cooled to below 100°C after holding for 4.5 hours;

[0054] (3) Tempering process: heat the tungsten-containing high-speed train brake disc steel after quenching to 635°C at a heating rate of 68°C / h, and water-cool to below 100°C after 6 hours of heat preservation.

[0055] The preparation process of tungsten-containing high-speed train brake disc steel is as follows: electric arc furnace or converter smelting→LF furnace refining→RH or VD vacuum degassing→continuous casting→slab heating...

Embodiment 3

[0059] A heat treatment method for steel for a tungsten-containing high-speed train brake disc, comprising the following steps:

[0060] (1) Normalizing process: heat the tungsten-containing high-speed train brake disc steel to 1045°C at a heating rate of 82°C / h, keep it warm for 6.5 hours, and then air-cool it to below 300°C;

[0061] (2) Quenching process: After normalizing, the tungsten-containing high-speed train brake disc steel is heated to 1005°C at a heating rate of 82°C / h, and then water-cooled to below 100°C after holding for 4.8 hours;

[0062] (3) Tempering process: heat the tungsten-containing high-speed train brake disc steel after quenching to 625°C at a heating rate of 82°C / h, and water-cool to below 100°C after 6.5 hours of heat preservation.

[0063] The preparation process of tungsten-containing high-speed train brake disc steel is as follows: electric arc furnace or converter smelting→LF furnace refining→RH or VD vacuum degassing→continuous casting→slab hea...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heat treatment method for tungsten-containing steel for a brake disc of a high-speed train. The heat treatment method comprises a normalizing process, a quenching process anda tempering process, wherein the heating temperatures of the three processes are respectively 1000-1100 DEG C, 980-1020 DEG C and 980-1020 DEG C; and according to the maximum thickness of the steel,the thermal insulation time is respectively 3.75-6.00min / mm, 3.00-4.50min / mm and 3.75-6.00min / mm. The tungsten-containing steel for the brake disc of the high-speed train, prepared according to the method, has a grain size of 20-25 microns, the mean particle size of carbides is between 0.020 micron and 0.040 micron, the texture is tempered sorbite, and the tungsten-containing steel has high-temperature performance, has a heat conductivity coefficient of 35-40W / (m.K) at a temperature of 20-700 DEG C, the tensile strength of more than or equal to 1000MPa at a temperature of 500 DEG C and the tensile strength of more than or equal to 900MPa at a temperature of 600 DEG C, and does not produce any crack after thermal-cold cycling of 1000 times at the temperature of 20-700 DEG C.

Description

technical field [0001] The invention belongs to the technical field of steel for high-speed rail transit parts, and in particular relates to a heat treatment method for steel for brake discs of high-speed trains containing tungsten. Background technique [0002] With the increase of the speed of high-speed trains, higher requirements are put forward for the timeliness, safety and stability of train braking, which also means that the quality and performance of train braking devices and braking materials need to meet higher requirements. Require. The basic brakes of high-speed trains all adopt disc brake devices. For high-speed trains above 200km / h, brake devices that are paired with forged steel brake discs and powder metallurgy brake pads are generally used in the world. The most basic function of the brake disc is to absorb the braking kinetic energy and convert it into heat energy and dissipate it into the air. [0003] Improving the high-temperature performance of high-...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/28C21D1/18C22C38/02C22C38/04C22C38/22C22C38/44C22C38/06C22C38/24C22C38/46C22C38/20C22C38/42F16D65/12
CPCC21D1/18C21D1/28C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/42C22C38/44C22C38/46F16D65/125F16D2200/0021
Inventor 胡芳忠汪开忠刘学华龚志翔于文坛陈世杰郝震宇
Owner MAGANG (GROUP) HOLDING CO LTD