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Method for the heat treatment of extended steel products
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A technology for steel products and products, which is applied in the field of heat treatment of extended steel products, and can solve problems such as heating
Inactive Publication Date: 2012-05-30
AGA AB
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[0007] A second problem is that after rolling the product is often cooled to temperatures below, say, 720°C, thereby transforming the surface of the material, after which the surface of the material is heated in order to achieve recrystallization
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[0015] The invention relates to a method of heat treating elongated steel products such as bars, pipes, workpieces and the like. The term "heat treatment" is used to refer to conventional heat treatment and also to the application of heat to an article in order to raise or adjust the temperature of the article.
[0016] Heat treatment is carried out while the product is in motion.
[0017] According to the present invention, the article is heated using DFI burners ("DFI" is an acronym for "Direct Flame Impingement") arranged such that a set of DFI burners substantially covers the circumference of the article. In addition, the DFI burner is arranged to be integrated in a conveyor that transports the product in a direction perpendicular to the plane in which the flame of the DFI burner substantially lies.
[0018] According to a preferred embodiment, the fuel of the burner is liquid or gaseous and a gas containing at least 80% oxygen by volume is used as oxidant.
[0019] fig...
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Abstract
A method for the heat treatment of extended steel products such as, for example, rods, pipes, work pieces, etc., while the products are in motion. The invention is characterised in that the products (13, 14, 33, 34, 35) are caused to be heated by means of DFI burners (6-11, 16-20) (where 'DFI' is an abbreviation for 'direct flame impingement'), which burners are caused to be located such that oneset of burners (6, 7, 8, 9, 10, 11), (16, 17, 18, 19, 20) essentially covers the circumference of the products, and in that the burners are caused to be located integrated into arrangements (2-4, 13)that transport the product in a direction that is perpendicular to a plane in which the flames of the burners essentially lie.
Description
technical field [0001] The invention relates to a method for the heat treatment of extended steel products. Background technique [0002] During the processing of steel products, the mechanical properties, metallurgical properties and surface chemical properties of the material change. It is necessary to modify these properties before further use and / or processing. Heating followed by cooling is one way of changing the properties of a material. [0003] Before the material is processed, it is heated to processing temperature, for example to 1150°C, in order to roll the workpiece into bar, wire or tube. After the processing operation, the material is cooled on a cooling bed or the like. The heat supplied to the material to enable thermal processing is sometimes recovered by heat exchangers, but is mostly lost. [0004] In order to obtain material properties suitable for cold working, all types of materials to be subjected to cold working must in most cases be heat treated...
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