Strip steel online heat treatment device and heat treatment method
A heat treatment method and strip technology, applied in the field of strip manufacturing, can solve problems such as the inability to meet the requirements of high-performance steel structure regulation, and achieve the effect of strong applicability
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Embodiment 1
[0071] Embodiment one discloses a kind of online heat treatment method to Q&P steel, Figure 4 It is a schematic diagram of on-line heat treatment of hot-rolled high-performance steel (Q&P steel, medium manganese steel) that needs to be heated during the cooling phase transformation process involved in the embodiment of the present invention. combine Figure 4 , the heat treatment process of Q&P steel is: the strip steel is rapidly cooled to the martensitic transformation starting point M after finishing rolling s and the end point of martensitic transformation M f Between the quenching temperature QT, austenite is transformed into martensite in large quantities, and then the temperature is rapidly raised to the partition temperature PT to keep warm, C is partitioned from martensite to austenite, and the remaining austenite is gradually enriched in carbon, forming stable austenite , the final structure is lath martensite + retained austenite. The retained austenite may deco...
Embodiment 2
[0085] Embodiment 2 discloses a method for on-line heat treatment of medium manganese steel, combining Figure 4 , post-rolling controlled cooling and heat treatment process of hot-rolled medium-manganese steel: the strip steel is rapidly cooled to the end point of martensitic transformation after finishing rolling f Next, the austenite transforms into lath martensite, and then rapidly heats up to the γ+α two-phase region for annealing, and the martensite reverses into ultrafine-grained ferrite and austenite. Utilize the thin slab continuous casting and rolling production line of the online heat treatment device of the present invention to produce MMn1200 steel, its main steps are as follows:
[0086] The MMn1200 molten steel whose composition is shown in Table 4 is cast into a continuous casting slab with a thickness of 100 mm by the high-speed continuous casting machine 1, the casting speed is 5.5 m / min, and the temperature of the slab is 1040 ° C. After scaling, it enters ...
Embodiment 3
[0098] Embodiment 3 discloses a method for on-line heat treatment of DP steel, Figure 5 It is a principle diagram of controlled cooling and phase transformation after rolling of hot-rolled high-performance steel (DP steel, TRIP steel, MS steel) and other steel types that do not require heating during the cooling phase transformation process involved in the present invention. combine Figure 5 , the post-rolling controlled cooling process of hot-rolled DP steel is as follows: after the strip steel exits the finishing mill, it is quickly cooled to an intermediate temperature (two-phase region), and after a period of air cooling, about 80% of the austenite structure is transformed into ferrite. The remaining austenite is transformed into martensite after rapid cooling, and the final structure is a duplex structure of ferrite F+martensite M. Utilize the thin slab continuous casting and rolling production line of the online heat treatment device of the present invention to produc...
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Abstract
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