Steel belt lead-bath quenching and backfire product line decarburization technique and device thereof

A lead bath quenching and production line technology, applied in quenching devices, heat treatment equipment, heat treatment baths, etc., can solve problems such as fracture, the surface hardness of steel strips should not be too high, and cracks are prone to occur, and achieve toughness enhancement, surface hardness reduction, and improvement plastic effect

Inactive Publication Date: 2007-10-17
奉化市光亮热处理电炉有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high carbon equivalent of this type of steel, the surface hardness after quenching is very high. When the steel strip is partially bent, it is prone to cracks and even breaks. The steel strip can be bent into a certain shape, so the hardness of the steel strip surface should not be too high

Method used

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  • Steel belt lead-bath quenching and backfire product line decarburization technique and device thereof
  • Steel belt lead-bath quenching and backfire product line decarburization technique and device thereof

Examples

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Effect test

Embodiment 1

[0022] The 2 mm thick and 24 mm wide 30CrMo steel strip used to make shoe knives is subjected to continuous decarburization treatment on a continuous lead bath quenching and tempering heat treatment production line, and the steel strip moves at a speed of 1.5 to 2.0 meters per minute. The composition content of the mixed protective gas is (75%H 2 +25%N 2 ) 0.9 (H 2 O) 0.1 . The protective gas mixed with water vapor is further heated to 860-880°C in the pipeline, and then sprayed to the upper and lower surfaces of the steel strip through the nozzle at a flow rate of 800 ml per minute. The decarburization time of the moving steel strip surface is 2-3 minute. After the above decarburization process, the surface decarburization layer is about 5 microns thick, and the decarburization amount is about 40%. The hardness of the steel strip surface is obviously lower than that of the undecarburized steel strip, and the plasticity is obviously improved. The steel strip does not bre...

Embodiment 2

[0024] The 4mm thick and 80mm wide 40CrMo steel strip, which is also used to make shoe knives, is subjected to continuous decarburization treatment on a continuous lead bath quenching and tempering heat treatment production line, and the steel strip moves at a speed of 1.0 to 1.5 meters per minute. The composition content of the mixed protective gas is (75%H 2 +25%N 2 ) 0.8 (H 2 O) 0.2 . The protective gas mixed with water vapor is heated to 880-900 degrees in the pipeline, and sprayed to the upper and lower surfaces of the steel strip through the nozzle at a flow rate of 1000 ml per minute. The decarburization time of the moving steel strip surface is about 1 to 2 minutes . After the steel strip treated by the above decarburization process, the surface decarburization layer is about 4 to 5 microns thick, and the decarburization amount is about 30 to 40%. cracking.

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Abstract

A surface decarburation technology in the process of metal strip plumbum quenching-tempering and apparatus are provided. The process comprises humidifying the protective gas to make the protective gas contain a certain vapor in the process of metal strip continuous quenching and heating, doing an oxidation reaction of oxygen in the hot vapor and carbon in the metal strip surface layer to obtain the objective of metal strip surface decarburation and the ecarburation layer about 5 mum thickness on the metal strip surface and improve the metal strip plastic nature obviously. Meanwhile, there has no distinct oxidation on the metal strip surface. The metal strip by decarburation treatment will not breakdown or appears crack by 180 DEG bending so as to effectively improve the rate of finished products and quality of the metal strip.

Description

technical field [0001] The invention relates to a surface decarburization technology for steel strip heat treatment, in particular to a method and equipment for surface decarburization in the process of quenching and tempering a steel strip in a lead bath. Background technique [0002] High-alloy steel or tool steel used for knives or band saws usually needs to be quenched and tempered, and because of the large amount of this type of steel, a quenching and tempering production line must be used for continuous strip heat treatment. The more mature heat treatment process is: lead bath quenching + tempering process under protective atmosphere to obtain high strength, high hardness, beautiful appearance and small deformation. However, due to the high carbon equivalent of this type of steel, the surface hardness after quenching is very high. When the steel strip is partially bent, it is prone to cracks and even breaks. The steel strip can be bent into a certain shape, so the har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D3/04C21D1/62C21D1/48C21D9/52
Inventor 周国展张龙方吴鲁海何国
Owner 奉化市光亮热处理电炉有限公司
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