Cobalt-containing steel for brake disc of high-speed train
A technology for high-speed trains and brake discs, applied in the direction of brake discs, brake types, brake components, etc., can solve the problems of less innovative research on materials, and achieve the effects of improving service performance, excellent thermal conductivity, and excellent high-temperature strength
Active Publication Date: 2018-03-06
MAGANG (GROUP) HOLDING CO LTD +1
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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
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Embodiment 1～4
[0035]A kind of cobalt-containing high-speed train brake disc steel, its chemical composition and weight percentage are as shown in table 1:
[0036] Chemical composition and weight percent of cobalt-containing high-speed train brake disc steel in table 1 embodiment 1~4
[0037]
[0038] The preparation method of the cobalt-containing high-speed train brake disc steel includes the following processes: electric arc furnace or converter smelting→LF furnace refining→RH or VD vacuum degassing→continuous casting→slab heating furnace heating→brake disc round steel Rolling→brake disc blank forging→normalizing+quenching and tempering heat treatment→machining→flaw detection. heat-rolled The round steel is then heated and forged into a brake disc blank with a thickness of 65 mm. After heat treatment and finishing into a high-temperature tensile and thermal conductivity sample in Table 2, the high-temperature mechanical properties and thermal conductivity are analyzed. The analysis ...
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Abstract
The invention discloses cobalt-containing steel for a brake disc of a high-speed train. The cobalt-containing steel is prepared from the following chemical components in percentage by mass: 0.20-0.30%of C, 0.20-0.40% of Si, 0.20-0.40% of Mn, 0.90-1.50% of Cr, 0.40-0.90% of Mo, less than or equal to 0.025% of Al, 0.70-1.00% of V, 0.50-0.80% of Co, less than or equal to 0.20% of Ni, less than or equal to 0.20% of Cu, less than or equal to 0.0050% of N, less than or equal to 0.010% of P, less than or equal to 0.005% of S and the balance of Fe and unavoidable impurities. The cobalt-containing steel disclosed by the invention has excellent high-temperature performance, the thermal conductivity coefficient is 35-40W / (m.K) at 20-700 DEG C, and the tensile strength is greater than or equal to 1,000MPa at 500 DEG C and is greater than or equal to 900MPa at 600 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 cobalt-containing high-speed train brake disc steel. 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-speed train brake disc materials is o...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/44C22C38/06C22C38/24C22C38/46C22C38/30C22C38/52C22C38/20C22C38/42C21D1/18C21D1/28F16D65/12
CPCC21D1/18C21D1/28C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/30C22C38/42C22C38/44C22C38/46C22C38/52F16D65/125F16D2200/0021
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