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Short flow path manufacturing method of heavy rail

A manufacturing method and a short-process technology, applied in the direction of metal rolling, etc., can solve problems such as high burning loss rate, ineffective correction equipment, and improve the quality of heavy rails, so as to reduce land occupation and facilities, save equipment and investment, The effect of shortening the process flow

Inactive Publication Date: 2007-02-14
ANGANG STEEL CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Most of the blooming slabs or continuous casting slabs provided have high steel inclusions, which affect the quality of heavy rails, and the stability of chemical components is poor. The slow cooling process will inevitably produce white spots due to the inclusion of hydrogen gas, leading to accidents with unimaginable consequences. In addition, during the hot rolling process, it is easy to cause overburning and decarburization in the continuous pusher heating furnace. Due to the multi-purpose pass method, it is difficult to fully extend the rail head and rail bottom, and the quality is poor, which cannot meet the quality requirements of high-speed rails
[0004] High energy consumption for 2 tons of steel: the billet or continuous casting billet is heated and opened, cooled, reheated, and heated by a three-stage continuous heating furnace. The energy consumption of the heating furnace is high, and the energy consumption per ton of steel reaches 2.2GJ. long, burning rate up to 1.1%, CO 2 The emissions are high, and only 120m of mixed coal is consumed per ton of steel 3 Generate and emit more CO 2 The volume is 120×0.368m 3 / t steel, we can see the serious consequences of high energy consumption per ton of steel
[0006] 1) Due to the long heating time and thick iron oxide scale, not only the yield is low, but also the surface quality of the heavy rail is affected;
[0007] 2) The inclined pass method used in the rolling process affects the shape and precision of the rail head and rail bottom due to the difficulty of rolling adjustment, which makes it difficult to improve the quality of heavy rails;
[0008] 3) After straightening, the heavy rail has a blind spot in the straightening, and there are uneven and defective parts. In this case, the defective part has to be cut off, and the yield will be affected by changing the ruler;
[0009] 4) The hot-rolled heavy rails are severely scratched, affecting the surface and shape, and the quality of the heavy rails is poor;
[0010] 5) The level of quality control inspection and testing equipment is poor, there is a lack of inspection and testing methods, the correction equipment is not effective, the quality of cold processing lines and rail end milling, drilling and quenching heat treatment is poor, and it is difficult to improve

Method used

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  • Short flow path manufacturing method of heavy rail
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Embodiment Construction

[0040] Realize the specific embodiment of the present invention, the manufacturing method of short flow heavy rail, process step:

[0041] Illustrate with reference to accompanying drawing:

[0042] 1. Out-of-furnace refining of molten steel in converter 1 steelmaking, the composition of molten steel is controlled to be qualified, molten steel is sent to LF furnace 2 to remove P, S slag VD furnace 3 to degas O, H, control weight percentage P≤0.015, S≤0.007, O ≤20×10 -4 H≤2×10 -4 ,

[0043] 2. Continuous casting machine 4 casting slabs, casting slabs in R12m four-strand continuous casting machine, casting slab size 280×280, 280×380, 320×410, fixed length 5.0m~8.0m; flame cutting, casting slabs after The output roller table is connected to the furnace entry roller table of the walking heating furnace.

[0044] 3. Slab heating and descaling: The slab of the continuous casting machine is conveyed by the roller conveyor through the lifting weighing device to weigh and record t...

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Abstract

A short-flow technology for manufacturing the heavy rails with 50 m in length includes such steps as refining molten steel, conticasting, step heating, shaping rolling, fine rolling, sawing by needed size, prebending-cooling, straightening, and inspection. Its advantages are short technological flow, high quality of product and low cost.

Description

(1) Technical field [0001] The invention relates to a method for manufacturing steel rails, in particular to a method for manufacturing short-flow heavy rails, and belongs to the technical field of pressure processing of ferrous metallurgical metals. (2) Background technology [0002] At present, most of the manufacturing methods of steel rails publicly used in China are carried out in large-scale production processes. Steelmaking is used to make blooms or continuous casting billets, which are sent to three-stage continuous heating furnaces to heat cold billets to 1200-1250 ℃, after billet opening in the rough rolling mill, rough rolling and finishing mill rolling into rails, hot sawing, printing, and when the temperature is 550-600 ℃, put it into the slow cooling pit within a limited time, cover and slow cooling for 5.5 hours, then open the pit After another 1.5 hours, the cover is hoisted out of the slow cooling pit for straightening, measuring scale inspection, and then e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/08
Inventor 刘玠蔡登楼李龙珍付伟毕恩复白莉姜海毕玉伟于广民濮智鹏杜斌荣峰王利来王延年
Owner ANGANG STEEL CO LTD
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