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A steel for high-speed railway bogie frame with a yield strength of 390mpa and its preparation method

A yield strength and bogie technology, applied in the field of metal materials, can solve the problems of cumbersome process and high manganese content, and achieve the effect of reducing maintenance costs, excellent welding performance and improving corrosion ability

Active Publication Date: 2020-12-01
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods have the disadvantages of carbon and manganese content in the steel, and the process is cumbersome.

Method used

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  • A steel for high-speed railway bogie frame with a yield strength of 390mpa and its preparation method
  • A steel for high-speed railway bogie frame with a yield strength of 390mpa and its preparation method

Examples

Experimental program
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Embodiment Construction

[0029] A steel for high-speed railway bogie frames with a yield strength of 390MPa. The chemical composition of the example steel is shown in Table 1.

[0030] Heating the cast slab to 1150-1220°C for complete austenitization, and then rolling, the finish rolling temperature of rough rolling is ≥1020°C, the start rolling temperature of finish rolling is ≤950°C, the finish rolling termination temperature is 800~880°C, after rolling Cool to 550-650°C at a rate of 5-15°C / s, and then air-cool or slowly cool to room temperature. The mechanical properties of the steel plates after hot working are shown in Table 2.

[0031] The salt spray corrosion rate of each example steel is lower than that of 09CuPTiRE steel by more than 20%.

[0032] Table 1 The chemical composition and mechanical properties of the steels in the examples

[0033] Example C mn Si P S Ni Cr Cu Nb Ti V Ca No.1 0.11 1.12 0.35 0.007 0.015 0.27 0.33 0.4 0.03 0.028 0.061 ...

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Abstract

The invention discloses high-speed rail bogie frame steel with 390MPa-grade yield strength, and a preparation method thereof. The high-speed rail bogie frame steel with 390MPa-grade yield strength comprises the chemical ingredients, by mass, 0.07% to 0.12% of C, 0.50% to 1.00% of Mn, 0.15% to 0.35% of Si, equal to or smaller than 0.020% of P, equal to or smaller than 0.01% of S, 0.20% to 0.50% ofNi, 0.30% to 0.80% of Cr, 0.2% to 0.05% of Cu, 0.015% to 0.025% of Ti, 0.01% to 0.04% of Nb, 0 to 0.07% of V, 0.001% to 0.002% of Ca, and the balance Fe and unavoidable impurities. The ingredients mentioned above are subjected to smelting and casting, are heated at 1, 200 DEG C, are subjected to hot working to have the required dimensions, and then are subjected to controlled cooling. The microstructure of the steel is ferrite plus pearlite, the yield strength of the steel ranges from 390MPa to 460MPa, the tensile strength of the steel ranges from 520MPa to 620MPa, the percentage elongation after fracture of the steel is larger than or equal to 20%, the impact energy of a V-shaped notch at the temperature of minus 40 degrees is larger than or equal to 120 J, the carbon equivalent CEQ of the steel is equal to or smaller than 0.35%, and the crack sensitivity factor Pcm of the steel of the steel is equal to or smaller than 0.20%. The high-speed rail bogie frame steel with 390MPa-grade yield strength has the characteristics of being low in cost, excellent in comprehensive mechanical property, easy to weld, resistant to corrosion and the like.

Description

technical field [0001] The invention discloses a high-speed rail bogie frame steel with a yield strength of 390MPa and a preparation method thereof, belonging to the field of metal materials. The steel type can meet the requirements of high-speed rail light weight, service in alpine regions, easy welding and corrosion resistance. Background technique [0002] With the sixth major speed increase of my country's railways, China has entered the era of high-speed railways. Steel for high-speed train bogies requires not only certain strength and high toughness, but also good welding performance, fatigue resistance and corrosion resistance. Currently used bogie steels such as Q345 series and S355 steels have low strength and poor low-temperature toughness, and most high-speed rail bogie steels currently adopt European standards. Therefore, the development of new high-speed train bogie steel with independent intellectual property rights has very practical significance. [0003] C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/42C22C38/50C22C38/48C22C38/46C21D8/02
CPCC21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/42C22C38/46C22C38/48C22C38/50
Inventor 王纯余伟刘敏陈雨来何春雨程知松
Owner UNIV OF SCI & TECH BEIJING