Niobium-containing axle for urban rails and subways and heat treatment technology thereof

A subway and process technology, applied in the field of alloy steel, can solve the problems that cannot meet the high-speed development needs of urban rail subways, the strength, toughness and fatigue performance of the proximal part, and the high production cost of axles, etc., and achieve excellent fatigue resistance. Excellent fatigue resistance, good strength and toughness combination effect

Inactive Publication Date: 2020-06-12
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of urban rail transit, the demand for axles has increased sharply. At present, domestic and foreign markets, especially in Europe and Asia, still mainly use EA1N and EA4T material axles in the standard EN13261. EA1N is a positive train axle and is mainly used in low-speed cities. Rail and subway models, the fatigue strength is low, which can no longer meet the high-speed development needs of urban rail subways. EA4T is an alloy steel axle, and the heat treatment process is quenched and tempered heat treatment,

Method used

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  • Niobium-containing axle for urban rails and subways and heat treatment technology thereof
  • Niobium-containing axle for urban rails and subways and heat treatment technology thereof
  • Niobium-containing axle for urban rails and subways and heat treatment technology thereof

Examples

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Example

[0046] Example 1-Example 4

[0047] A niobium-containing urban rail subway axle, and its production process is: electric arc furnace or converter smelting → LF furnace refining → RH or VD vacuum degassing → continuous casting → casting billet heating furnace heating → axle blank rolling → axle blank forging →Rough turning of rough axles→finishing of axle end faces→heat treatment process→finish turning of axle outer circle→external grinding→flaw detection.

[0048] The heat treatment process includes normalizing, quenching and tempering. The heat treatment process parameters of Example 1 to Example 4 for producing niobium-containing urban rail subway axles are as follows:

[0049] Normalizing: Heat the forged blank axles of the niobium-containing urban rail metro with a maximum diameter of 235mm and a length of 2200mm, at a heating rate of 80℃ / h, to a temperature of 890℃, and heat and hold at this temperature for 300 minutes, and air-cool to 200℃ the following. After normalizing, no...

Example

[0054] Comparative example 1-Comparative example 2

[0055] A kind of axle, its production process is: electric arc furnace or converter smelting → LF furnace refining → RH or VD vacuum degassing → continuous casting → casting billet heating furnace heating → axle billet rolling → axle billet forging → rough axle turning → Axle end face machining→heat treatment process→external circle finishing of axle→external grinding→flaw detection.

[0056] The heat treatment process parameters of the axles of Comparative Example 1 and Comparative Example 2 are as follows:

[0057] Quenching: The forged urban rail subway axle with a maximum diameter of 235mm and a length of 2200mm is heated at a heating rate of 120°C / h to a temperature of 850°C, heating at this temperature for 300 minutes, and then water cooling to room temperature.

[0058] Tempering: Heat the forged blank axle of the urban rail subway with a maximum diameter of 235mm and a length of 2200mm at a heating rate of 100°C / h to a tempe...

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Abstract

The invention provides a niobium-containing axle for urban rails and subways and a heat treatment technology thereof. The axle is prepared from the components of: 0.34 0.39% of C, 0.20 0.35% of Si, 1.40 1.60% of Mn, 0.25 0.45% of Cr, 0.10 0.20% of Ni, 0.10 0.20% of Mo, 0.015 0.050% of Nb, 0.0010 0.0050% of Ca, 0.0015 0.0030% of B, less than or equal to 0.010% of P, less than or equal to 0.008% ofS, less than or equal to 0.0010% of T[O], 0.015 0.035% of Als, and the balance of Fe and other unavoidable impurities. According to niobium-containing axle for urban rails and subways and the heat treatment technology thereof, the heat treatment technology of "normalizing + tempering (quenching + tempering at high temperature)" is adopted, and the axle has the advantages of low cost, high strengthand excellent fatigue resistance.

Description

technical field [0001] The invention belongs to the field of alloy steel, and in particular relates to a niobium-containing urban rail subway axle and a heat treatment process thereof. Background technique [0002] The axle is one of the most important moving and load-bearing parts in various vehicles related to safety. Because the vehicle bearing is subjected to dynamic loads, the force state is relatively complicated, such as bending load, torsional load, bending-torsion composite load, and is subject to certain impacts, especially for urban rail subway axles, and its force state is more complicated. Therefore, urban rail subway axles may break due to fatigue, bending, torsion or tensile stress during service, among which fatigue fracture is a common fracture form of high-speed axles. In order to ensure the safe operation of the vehicle, the axle of the urban rail subway must have sufficient reliability and fatigue safety factor. Urban rail subway axle material is one of...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C38/48C22C38/44C22C38/06C22C38/04C22C38/02C21D1/28C21D1/18C21D9/28
CPCC21D1/18C21D1/28C21D9/28C21D2211/002C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/54C22C38/58
Inventor 于文坛张艳刘学华汪开忠赵海童乐陶盈龙
Owner MAANSHAN IRON & STEEL CO LTD
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