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Cutting method of chromium-molybdenum stainless steel composite layer

A cutting method and technology of stainless steel layer, applied in welding equipment, gas flame welding equipment, metal processing equipment, etc., can solve the problems of cutting interruption, poor fluidity, and high melting point of oxides, and achieve the effect of easy operation

Active Publication Date: 2018-10-16
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a cutting method of chrome-molybdenum stainless steel composite layer, to solve the problem that the oxide produced by the combustion of stainless steel has a high melting point and poor fluidity which will lead to cutting interruption when the gas cutting method is used to cut the chromium-molybdenum stainless steel composite layer

Method used

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  • Cutting method of chromium-molybdenum stainless steel composite layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this case, the cylinder uses 12Cr2Mo1R as the base layer and has a thickness of 100mm. The internal surfacing is welded with 6.5mm 347 series stainless steel. The cylinder is opened by the following cutting method.

[0032] (1) Cutting material:

[0033] Oxygen: industrial oxygen, purity 99.2wt%, impurity content 0.02wt%, bottled pressure 10MPa, cutting pressure 0.7MPa;

[0034] Propane: bottled pressure 1.6MPa, cutting pressure 0.05MPa;

[0035] Cutting gun: shooting suction type G01-300; cutting nozzle: plum blossom 3#.

[0036] (2) Cutting method:

[0037] 1) Start cutting from the Cr-Mo steel side, and use an oxidizing flame to preheat the cutting position before the first cutting process. When the cutting temperature (1300°C) is reached, the high-pressure oxygen valve is gradually opened.

[0038] 2) Tilt the cutting torch 30° to the length of the incision for the first cutting process to form the incision so that the molten metal and oxide flow out evenly in the opposite d...

Embodiment 2

[0041] A: In this case, the cylinder uses 12Cr2Mo1R as the base layer and has a thickness of 100mm. The internal surfacing is welded with 6.5mm 347 series stainless steel. The cylinder is opened by the following cutting method.

[0042] (1) Cutting material:

[0043] Oxygen: industrial oxygen, purity 99.2wt%, impurity content 0.02wt%, bottled pressure 10MPa, cutting pressure 0.7MPa;

[0044] Propane: bottled pressure 1.6MPa, cutting pressure 0.05MPa;

[0045] Cutting gun: shooting suction type G01-300; cutting nozzle: plum blossom 3#.

[0046] (2) Cutting method:

[0047] 1) Start cutting from the Cr-Mo steel side, and use an oxidizing flame to preheat the cutting position before the first cutting process. When the cutting temperature (1300°C) is reached, the high-pressure oxygen valve is gradually opened.

[0048] 2) Tilt the cutting torch 30° to the length of the incision for the first cutting process to form the incision so that the molten metal and oxide flow out evenly in the opposit...

Embodiment 3

[0061] A: In this case, the cylinder uses 12Cr2Mo1R as the base layer and has a thickness of 100mm. The internal surfacing is welded with 6.5mm 347 series stainless steel. The cylinder is opened by the following cutting method.

[0062] (1) Cutting material:

[0063] Oxygen: industrial oxygen, purity 99.2wt%, impurity content 0.02wt%, bottled pressure 10MPa, cutting pressure 0.7MPa;

[0064] Propane: bottled pressure 1.6MPa, cutting pressure 0.05MPa;

[0065] Cutting gun: shooting suction type G01-300; cutting nozzle: plum blossom 3#.

[0066] (2) Cutting method:

[0067] 1) Start cutting from the Cr-Mo steel side, and use an oxidizing flame to preheat the cutting position before the first cutting process. When the cutting temperature (1300°C) is reached, the high-pressure oxygen valve is gradually opened.

[0068] 2) Tilt the cutting gun by 10° to the length of the incision and swing the cutting gun for the first cutting process to form the incision so that the molten metal and oxide flo...

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Abstract

The invention provides a cutting method of a chromium-molybdenum stainless steel composite layer. In the method, the chromium-molybdenum stainless steel composite layer comprises a stainless steel layer and a chromium-molybdenum carbon steel layer, wherein the chromium-molybdenum carbon steel layer is arranged on the surface of the stainless steel layer. The method comprises the following steps that a first cutting process is carried out on the surface of the chromium-molybdenum carbon steel layer to form a notch; and a second cutting process is carried out at the notch, and an air cutting gunis enabled to move in the length direction of the notch, and swing back and forth in the advancing process until cutting of the stainless steel layer is completed. According to the cutting method, during the first cutting process, the chromium-molybdenum carbon steel layer is melted, and then the air cutting gun is enabled to swing back and forth in the length direction of the notch in the secondcutting process, and therefore, the melting heat of the carbon steel layer can be reasonably utilized in the second cutting process; and meanwhile, molten iron oxide can be used for diluting the oxide which is difficult to melt and not easy to flow, so that cutting is not interrupted and is completed. The method does not need a high-power ion cutting machine, and has the advantages of being simple, convenient to operate, time-saving, labor-saving and the like.

Description

Technical field [0001] The invention relates to the field of metal cutting, in particular to a method for cutting a chromium-molybdenum stainless steel composite layer. Background technique [0002] The chromium-molybdenum stainless steel composite plate is usually cut by plasma cutting and other methods, but the cutting of the chromium-molybdenum stainless steel composite plate with a thickness of 50-150mm requires a high-power plasma cutting machine. In the absence of a high-power plasma cutting machine, gouging followed by gas cutting can also be used, that is, carbon arc gouging is used to remove the stainless steel composite layer within 40mm of the cutting line, and then conventional flame cutting is used. After cutting with this method, the gouging removal surface needs to be polished, inspected, and repaired, and the process is more complicated. If gas cutting is used directly, when cutting to the stainless steel layer, the chromium oxide and nickel oxide produced by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K7/00
CPCB23K7/00
Inventor 王忠莲蔡立春王鑫刘绍宽舒世江韩永强钟鹏程于文忠李宝春郝立栋蒋金芳张晏崧梁皓宋晗白潇
Owner PETROCHINA CO LTD
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