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A production method of economical cold-rolled steel plate for water heater water tank outer plate

A technology for water heater water tank and cold-rolled steel plate, applied in metal rolling and other directions, can solve the problems of unspecialized control of plate shape, low yield strength, difficult welding, etc., and achieve the effects of reasonable composition design, short process flow and low manufacturing cost

Active Publication Date: 2022-05-03
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cost of this patented product is low, its thickness is more than 0.50mm, and its yield strength is obviously low, and the shape of the plate is not specially controlled. There are risks of insufficient strength and difficult welding when rolled into a water heater tank shell
Therefore, this patented product and method cannot be applicable to the requirements of cold-rolled steel plates for water heater outer plates at all.

Method used

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  • A production method of economical cold-rolled steel plate for water heater water tank outer plate
  • A production method of economical cold-rolled steel plate for water heater water tank outer plate
  • A production method of economical cold-rolled steel plate for water heater water tank outer plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The smelting composition is controlled as follows: C=0.040%, Mn=0.25%, Si=0.010%, P=0.011%, S=0.012%, Als=0.029%, and the balance is Fe and other residual trace elements.

[0025] The process control of the whole process is as follows: the vacuum degree of RH refining decarburization in the steelmaking process is 60-75Pa, the decarburization time is 9min, and then the slab with a thickness of 230mm is continuously cast. Hot rolling process red delivery, slab exit temperature 1255°C, finish rolling temperature 890°C, coiling temperature 649°C, edge heater and heat preservation cover are used for coil passing, hot rolled coil thickness 2.5mm, crown 40μm, wedge- 10-10 μm. The total reduction rate of cold continuous rolling in the acid rolling process is 84.0%, and the rolling is controlled by micro-medium waves. The bending force of the work rolls of the 1st to 4th stands is 100-250KN, and the bending force of the work rolls of the 5th stand is 200-500KN. The bending forc...

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Abstract

The invention relates to a production method of an economical cold-rolled steel plate for the outer plate of a water heater water tank. After being smelted in a converter and refined by RH, the molten iron in a blast furnace is continuously cast into a slab with a thickness of 230 mm and sent directly to red, and then rolled in a completely austenite zone, After laminar flow cooling and medium temperature coiling, natural air cooling to below 60 °C obtains a hot-rolled steel coil with uniform ferrite structure and full analysis of AlN particles, and then re-uncoiled, continuously pickled and trimmed, and directly after special cold continuous rolling. A finished rolled hard steel sheet is obtained. The thickness of the finished cold-rolled steel plate is 0.30-0.40mm, the yield strength is 800-900MPa, the height of the edge wave is less than or equal to 1mm, and the sharpness is less than or equal to 1.0%, which can fully meet the all-round application requirements of the cold-rolled steel plate for the outer plate of the water heater tank, and can greatly Reduce the cost of material procurement for customers. The invention has remarkable economic benefits and brand benefits, and is very suitable for popularization and application in domestic mainstream iron and steel enterprises.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a production method of an economical cold-rolled steel plate for the outer plate of a water heater tank. Background technique [0002] Storage water heaters with water tanks are currently the most widely used household water heaters, and their water tank shells are usually formed by cold-rolled annealed high-strength steel plates and assembled after painting. The commonly used thickness specifications of steel plates for water heater tank shells are 0.4-0.7 mm, and the annual domestic demand exceeds 60,000 tons. Thinning and cost reduction of this type of steel plate is an industry trend, so the steel plate is required to have high strength after forming to resist local deformation; in addition, due to the design requirements of the coiling process of the water tank shell product, the steel plate needs to be painted after edge-to-edge welding, There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/02B21B1/22C22C38/02C22C38/04C22C38/06C22C33/04
CPCB21C37/02B21B1/22C22C38/02C22C38/04C22C38/06C22C38/002C22C33/04B21B2001/225B21B2261/20B21B2261/04B21B2265/12
Inventor 王乐陈晓潇李洪翠胡华东高兴昌孙明双朱信成张冲冲李柏君王硕王鹏飞
Owner SD STEEL RIZHAO CO LTD
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