Steel rail online induction heating control method
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A control method and induction heating technology, applied in the field of metallurgy, can solve problems such as not involving abnormal structures, and achieve the effect of reducing internal stress
Inactive Publication Date: 2018-05-04
BAOTOU IRON & STEEL GRP
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Problems solved by technology
None of the prior art and published patents involves how to control possible abnormal structures through heat treatment and cooling techniques
Method used
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Embodiment 1
[0032] Adopting the rail on-line induction heating control method of the present invention, the main chemical components are: by weight percentage, including 0.65-1.05% C, 0.50-0.90% Si, 0.80-1.50% Mn, 0-1.00% Cr, and the rest is iron , Nb, V, Ti, RE and other micro-alloying elements and impurities on-line induction heating to produce rails.
[0033] The specific operation is: after the rail is accelerated on-line cooling, the rail waist is continuously and rapidly heated by induction when it exits the heat treatment line. The heating temperature is 600°C, the heating time is 40 seconds, and the heating rate is 1m / s.
Embodiment 2
[0035] Using the rail on-line induction heating control method of the present invention, the main chemical components are: by weight percentage, including 0.65-1.05% C, 0.50-0.90% Si, 0.80-1.50% Mn, 0-1.00% Cr, and the rest is iron , Nb, V, Ti, RE and other micro-alloying elements and impurities on-line induction heating to produce rails.
[0036] The specific operation is: after the rail is accelerated on-line cooling, the rail waist is continuously and rapidly heated by induction when it exits the heat treatment line. The heating temperature is 680°C, the heating time is 20 seconds, and the heating rate is 0.5m / s.
Embodiment 3
[0038] Using the rail on-line induction heating control method of the present invention, the main chemical components are: by weight percentage, including 0.65-1.05% C, 0.50-0.90% Si, 0.80-1.50% Mn, 0-1.00% Cr, and the rest is iron , Nb, V, Ti, RE and other micro-alloying elements and impurities on-line induction heating to produce rails.
[0039] The specific operation is: after the rail is accelerated on-line cooling, the rail waist is continuously and rapidly heated by induction when it exits the heat treatment line. The heating temperature is 650°C, the heating time is 25 seconds, and the heating rate is 1.2m / s.
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Abstract
The invention discloses a steel rail online induction heating control method. The steel rail online induction heating control method comprises the steps that induction heating is implemented to the steel rail web portion discharged out of the heat treatment line, and the heating temperature of the steel rail web portion ranges from 600 to 680 DEG C. According to the steel rail online induction heating control method, steel rail production is carried out, through the rail web compensation heating, the overcooling degree of the steel rail after online heat treatment is restrained, the staying time of the steel rail on the pearlite transition area can be prolonged, and generation of an abnormal martensite structure is avoided; through the rail web heating control, the temperature difference between the rail head and the rail bottom can be coordinated, the steel rail inner stress can be reduced, the steel rail straightening cracking risk is reduced, and the inner stress after steel rail straightening can be reduced. The method is easy and feasible and suitable for industrial production.
Description
technical field [0001] The invention relates to the technical field of metallurgy, in particular to an online heat treatment control method for rails. Background technique [0002] With the development of high-speed and heavy-duty railway transportation, higher and higher requirements are put forward for the strength and hardness of rails in railway transportation. At present, the strength and toughness of rails are generally improved by heat treatment. In the process of heat-treating the rail, in order to obtain good strength and toughness, the heat-treated hardened layer of the rail must obtain all the fine pearlite structure. At the same time, there must be no martensite structure on the entire cross-section of the rail. The stability of heat-treated rail product quality and the service life of the rail. [0003] The carbon content in pearlitic steel rail is high, and alloying elements such as manganese and chromium are usually used to increase its hardenability, which ...
Claims
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Application Information
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