Seamless steel pipe-line accelerated cooling technology Intr
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Seamless steel pipe-line accelerated cooling technology Introduction
Many studies have shown to speed up the steel hot-rolled (generally greater than 4L) cooling rate after hot rolling temperature can improve the steel microstructure and mechanical properties. For example: the ferrite Association pearlite
Steel, the faster the cooling rate after rolling through the ferrite phase transformation temperature range, can promote the product grain refinement of ferritic steel strength and toughness at the same time.
Seamless steel pipe-line
Seamless steel pipe rolling line cooling, the use of "air cooling" means cooling bed j: conducted. Fans and other equipment, by accelerating the air flow rate and improve the heat transfer efficiency of the gas in steel pipe and string, steel pipe for cooling.
Its advantages are: (1) cooling is more uniform, steel is not easy deformation; (2) lower investment cost of the technology and equipment. The disadvantages are: (1) Cooling capacity is limited, usually the cooling rate does not exceed 5 ° C / s, and a lower cooling rate of thick-walled tube; (2) and knitting and performance improvement is limited.
The past 30 years, other than hot-rolled seamless steel pipe production steel manufacturing, such as hot rolled strip, the Central Plains board and long rods, wire, profiles and other fields, accelerated cooling after hot rolling process is widely used. Typically, the accelerated cooling equipment used in the cooling medium is water. Use of water and the steel surface
Of the heat exchanger, to impose a cooling of the steel, faster than air-cooled cooling rate. However, at home and abroad have not hot-rolled seamless steel pipe on the use of modern cooling technology implementation of the relevant reports of accelerated cooling.
In particular, online quenching does not belong to the online accelerated cooling discussion areas. Online quenching the rolled steel tubes after direct Nazi fire to 6J. Points below, and online accelerated cooling especially in the steel pipe to a given diameter or sheets
Reduction machine, from the end of the high temperature (4, i :) to ferrite phase transformation temperature range of the cooling process. Online quenching the pipes out of the roller of the rolling line, online accelerated cooling without the tube from the rolling line roller, but in the process of steel pipes run in the rollers of the rolling line of the implementation of cooling.
Online accelerated cooling on hot-rolled seamless steel pipe with water as the cooling medium, mainly there are two aspects, on the one hand, water-cooled high cooling rate, to ensure that the difficulty of the entire steel pipe cooling uniformity sum increase
Canada, the Seamless pipe cooling is uneven, a direct result of the "bending" waste; the other hand, the cooling equipment in the steel pipe the process of moving, both the steel pipe inner and outer surfaces, development is difficult, if only in the steel pipe surface cooling will cause the outer surface of the organizations and the difference in performance, although this, but still
Can accelerate the cooling rate of the steel pipe, is very effective for improving the yield strength of thick structural steel (low qualified rate).
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