Process for manufacturing corrosion resistant metal products

A metal and product technology, applied in the field of manufacturing technology of anti-corrosion metal products

Inactive Publication Date: 2002-10-23
NX INFRASTRUCTURE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] Additional cost for welding mild steel pipe head to stainless steel pipe

Method used

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  • Process for manufacturing corrosion resistant metal products
  • Process for manufacturing corrosion resistant metal products
  • Process for manufacturing corrosion resistant metal products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] to prepare figure 2 The blanks shown are first collected and used with the above scrap consisting of mild steel or other suitable type of engineering steel. The debris is first crushed by the first crushing device 8, which may be a hammer mill or other commonly used crushing devices. In the crushing device 8, the debris is crushed for the first time, its size becomes smaller, the burrs are reduced, and it is convenient for further processing. But in this process, their size cannot be reduced much, because they have a lot of oil, which is easy to stick to the pulverizer.

[0066] The conveying mechanism conveys them from the pulverizer 8 to a commonly used degreasing device 10, so as to remove the oil stains, moisture and other impurities carried by them. To remove impurities, it is desirable to include in the apparatus 10 a rotary dryer through which the chips are passed to remove oil, water and impurities.

[0067] After passing through the device 10, the chips are ...

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Abstract

Disclosed is a production method of anticorrosion steel products. Products are manufactured by hot rolling a billet consisting of a stainless steel shell and a mass of mild steel shavings enclosed within the shell. The two reducing agents are added while the billet is heating. The first reducing agent is aluminum powder, titanium shavings or other metals. Their affinity with oxygen is greater than that of chromium and oxygen, which can promote the formation of carbon monoxide instead of carbon dioxide from the air and oxygen entering the billet at about 800 degrees Celsius. The second reducing agent is provided by adding substances such as ammonium chloride or urea to the chips, which will decompose and generate reducing gases when heated. Alternatively, the billet can be heated in a reduction furnace, and the furnace gas can act as a second reducing agent.

Description

technical field [0001] The present invention relates to a manufacturing process of anti-corrosion metal products and products manufactured by said process. [0002] The invention is particularly suitable, but not limited to, the manufacture of products consisting of stainless steel cladding and an inner core made from recycled mild steel, carbon steel or stainless steel shavings. For example, the invention may also be used in the manufacture of products comprising other cores such as iron ore powder or other metals or metal ore powders. All can run into some common problems in the process of manufacturing above-mentioned class product. [0003] Here, "crumbs" generally refer to chips or leftovers generated during mechanical processing such as turning, milling, planing, grinding or stamping, and drilling of engineering steel. The term "swarf" is used herein for the purpose of including not only raw material shavings but also shavings which have been cleaned or otherwise treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/04B22F3/12B22F8/00C22B1/248C22B5/12C22B7/00C22C33/02
CPCB22F3/1216B22F8/00B22F2999/00C22B1/248C22B5/04C22C33/02Y10T428/12965Y10T428/1209Y10T428/12028Y10T428/12979Y02W30/50B22F3/1007B22F2003/1014B22F2201/01Y02P10/20
Inventor 安东尼诺·乔治·卡卡切
Owner NX INFRASTRUCTURE LTD
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