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Process for quenching-distribution heat treatment on 60Si2CrVA steel spring for trains

A quenching distribution and steel spring technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of insufficient austempering hardenability, reduced yield limit and fatigue strength, etc., and achieve good quenching hardenability and yield limit. and the effect of high fatigue strength, tensile strength and yield ratio

Inactive Publication Date: 2009-12-09
GUIZHOU UNIV
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

After austempering, under the same hardness conditions, compared with ordinary quenching and tempering, it has high toughness and small notch sensitivity, but the yield limit and fatigue strength are about reduced
At the same time, for springs with larger material diameters, the austempering hardenability is not enough, so it is difficult to use for larger springs

Method used

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Embodiment Construction

[0016] Embodiment of the present invention: when making 60Si2CrVA steel spring products for trains, the quenching-distribution heat treatment process of the present invention is used to make, that is, after the round bar material 60Si2CrVA steel with a diameter less than or equal to 50mm is polished, it is heated by induction heating to a temperature of 960°C to 1060°C, and then coil the 60Si2CrVA steel round bar into a spring at this temperature, cool the coiled spring to a temperature of 800°C to 900°C, and then roll it below the Ms point Quenching at a temperature of 130°C to 210°C and keeping it at a constant temperature for a period of time. The time for keeping the constant temperature is determined by the following method: for springs with a diameter of less than 20mm, the time for keeping the constant temperature is 10 to 30 seconds; For springs with a rod diameter of 20-50 mm, the constant temperature is maintained for 20-60 seconds; then the spring is quickly placed a...

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Abstract

The invention discloses a process for quenching-distribution heat treatment on 60Si2CrVA steel spring for trains. The process comprises the following steps: polishing a 60Si2CrVA steel round bar with diameter less than or equal to 50mm, and heating the steel round bar to a temperature of between 960 and 1,060 DEG C through an inductive heating mode; then, wrapping the 60Si2CrVA steel round bar into a spring in the temperature state; cooling the wrapped spring to a temperature of between 810 and 900 DEG C, quenching the spring at a temperature of between 130 and 210 DEG C, and keeping constant temperature for 10 to 60 seconds; quickly placing the spring in a medium at a temperature of between 280 and 350 DEG C, maintaining for 50 to 800 seconds, and placing the spring into water or oil for cooling; and tempering the spring at a temperature of between 250 and 470 DEG C for 60 to 120 minutes. The 60Si2CrVA steel spring product has the advantages of high yield limit and fatigue strength, good quenching harden ability, high tensile strength and yield ratio, high toughness and the like.

Description

technical field [0001] The invention relates to a quenching-distribution heat treatment process for 60Si2CrVA steel spring products used in trains, belonging to the technical field of metal heat treatment. Background technique [0002] Springs for locomotives and trains are very important mechanical parts, which play various functions such as shock absorption, energy storage, connection, and support. Locomotive springs work under alternating stresses such as periodic bending and torsion, and are subjected to dynamic load conditions such as tension, compression, torsion, and impact, and sometimes extremely high short-term sudden loads. Therefore, spring steel must have High fatigue strength, high tensile strength and yield strength ratio, sufficient plasticity and toughness, good surface quality, easy rolling and forming in hot state, good hardenability, etc. At present, the locomotive spring products mainly use spring steel such as 60Si2CrVA, 50CrVA, 52CrMoV4. The main pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/02C21D1/18C21D1/42
CPCY02P10/25
Inventor 梁益龙杨刚赵飞
Owner GUIZHOU UNIV
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