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Method for producing large thickness and high intensity steel plate for boiler drum

A high-strength steel plate and boiler steam drum technology, applied in the control of molten metal pouring from the ladle, rolling mill control device, metal rolling, etc., can solve the problems affecting the use of steel plates, etc., to reduce waste, uniform composition, reduce Effect of heat treatment energy consumption

Inactive Publication Date: 2009-06-10
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After scientific and technological research, in foreign countries, although steel products of the same level have been produced, the pits on the surface caused by the pressing of iron sheets have seriously affected the use of steel plates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The actual composition (by weight percentage) of the steel produced by the method of this embodiment is: C 0.13%, Si0.40%, Mn 1.43%, P 0.008%, S 0.003%, Al 0.030%, Nb 0.012%, V 0.004% , Ni 0.83%, Ceq 0.43%, rolled into 135mm steel plate. Its mechanical properties: yield strength 587MPa, tensile strength: 688MPa, δ 5 = 21.5%, 0°C impact energy AKV (longitudinal) 184, 175, 162J, 370°C high tension: yield strength 466MPa, tensile strength: 573MPa, δ 5 = 22.5%.

[0021] The production method of this embodiment is as follows: (1) smelting: molten steel is first smelted in an electric furnace, sent into an LF refining furnace for refining, and fed with an Al wire for 300 meters, and when the ladle temperature is 1600 ° C, the ladle VD furnace is vacuum treated. Add 100kg of SiCa blocks into one ton of molten steel, vacuum degree 0.5 Torr, and break the vacuum when the vacuum holding time is 30 minutes, which solves the phenomenon that the molten steel is deoxidized by Al lin...

Embodiment 2

[0029] The production method of this embodiment is as follows: (1) Smelting: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, and fed with an Al wire of 400 meters. Add 95kg of SiCa blocks into the molten steel, vacuum degree 0.5 Torr, and break the vacuum when the vacuum holding time is 40 minutes, which solves the phenomenon that the molten steel is deoxidized by Al wire alone and the content of non-metallic inclusions in the steel is high, and ensures the purity of the steel quality;

[0030] (2) Casting: After the vacuum is broken, the temperature is 1555°C, and then the 31T flat ingot mold is used for casting to ensure that the large-thickness, large-weight steel plate has sufficient reduction and raw materials;

[0031] (3) Heating: In order to avoid cracking on the surface of low-alloy high-strength steel ingots, the steel ingots should be delivered warm, warm cleaned, and warm loaded. The particles are small, low-speed ...

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Abstract

The invention discloses a production method for a high tensile steel plate used for a high thickness boiler drum. The production method comprises the following steps: (1) smelting: smelting molten steel in an electric furnace, the refining the molten steel in an LF finer, adding 300 to 500 meters of Al thread, and carrying out vacuum treatment in a bale VD furnace when the temperature of the bale is more than or equal to 1600 DEG C; (2) casting: keeping the temperature between 1,545 and 1,555 DEG C after damaging the vacuum; (3) heating: realizing the sending, clearing and filling of a steel ingot at a moderate temperature, cooling down the furnace for over 30 minutes before steel filling, and stewing the steel for one hour; (4) rolling: adopting II type rolling control technology, and setting a first stage as an austenite recrystallization stage and a second stage as an austenite non-recrystallization stage; (5) water cooling: cooling down the rolled steel plate on line, and keeping the red temperature between 700 and 750 DEG C; (6) heat treatment: carrying out the normalizing plus tempering treatment of the steel plate; and (7) shot blasting: carrying out shot blasting before storing the steel plate in a warehouse so as to completely remove the iron sheet produced during heating. The method shortens the steel rolling and heating time, reduces the consumption of production energy, and meets the requirements of a plurality of heat cycles during the boiler manufacturing process. The steel plate has good welding performance.

Description

technical field [0001] The invention relates to a production method of a high-strength steel plate for a boiler steam drum with a large thickness, in particular to a production method of a 13MnNiMo54 steel plate for a 110-145 mm boiler steam drum. Background technique [0002] 13MnNiMo5-4 (DIWA353) is a fine-grained low-alloy structural steel with good weldability. The steel has high medium temperature yield strength, good plasticity and toughness, and good welding performance. It is suitable for cold and hot forming and Welded components, especially suitable for boiler drums, pressure vessels, pipes and other components whose working temperature is not higher than 400°C. For a long time, due to the thickness of the steel plate and the wide surface, the current thickness reaches 145mm, and the product has been subjected to high temperature (350-450°C) and high pressure (150-250 kg / cm2) for a long time. 2 ) and a certain corrosive environment, the boiler industry has very st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C33/04C21C7/00B22D37/00B21B37/00C21D8/02C21D1/28
Inventor 赵全卿宋向前李经涛于生宁康康陈俊奇罗君高任军奎何广霞齐燕
Owner WUYANG IRON & STEEL
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