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Method for repairing core rods for rolling seamless steel pipes

A repair method and technology for seamless steel pipes, which are used in manufacturing tools, coatings, arc welding equipment, etc., can solve the problems of poor thermal fatigue resistance of surfacing layer, large pollution of electroplating process, and low bonding strength of electroplating layer. , to achieve the effect of low preheat and post heat requirements, small deformation, excellent high temperature resistance and wear resistance

Pending Publication Date: 2021-10-08
泰尔(安徽)工业科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the repair process of the mandrel usually adopts the method of "surfacing + electroplating", which mainly has the following shortcomings: 1. The surfacing process is poor. High preheating temperature will cause the mandrel to deform; at the same time, the surfacing layer has poor thermal fatigue resistance and is prone to cracks; 2. The electroplating layer has low bonding strength and is easy to peel off
Therefore the life-span of the mandrel that this kind of method obtains is shorter, can only reach about 80% of new product
At the same time, the electroplating process is highly polluting and does not meet the national green manufacturing requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The mandrel base material is H13, the diameter is The length is 11m; the mandrel is used for rolling ordinary carbon steel pipes.

[0048] The repair method of this mandrel is:

[0049] (1) Cleaning and inspection before repair: Clean and remove oil stains on the surface of the mandrel, and then inspect the mandrel to determine the processing size of the mandrel; the inspection mainly includes size inspection, deformation inspection, flaw detection, and appearance inspection.

[0050] (2) Processing before repair: According to the test results, a large CNC lathe is used to process the mandrel, mainly to remove the surface fatigue layer and eliminate defects such as cracks.

[0051] (3) Pre-surfacing inspection: Carry out flaw detection, dimension inspection, and hardness inspection on the mandrel, so as to ensure that the fatigue layer and no cracks and other defects are completely removed before the mandrel is surfacing, and the thickness of the surfacing is determin...

Embodiment 2

[0067] The mandrel base material is H13, the diameter is The length is 13m; the mandrel is used for rolling alloy steel pipe.

[0068] The repair method of this mandrel is:

[0069] (1) Cleaning and inspection before repair: Clean and remove oil stains on the surface of the mandrel, and then inspect the mandrel to determine the processing size of the mandrel; the inspection mainly includes size inspection, deformation inspection, flaw detection, and appearance inspection.

[0070] (2) Processing before repair: According to the test results, a large CNC lathe is used to process the mandrel, mainly to remove the surface fatigue layer and eliminate defects such as cracks.

[0071] (3) Pre-surfacing inspection: Carry out flaw detection, dimension inspection, and hardness inspection on the mandrel, so as to ensure that the fatigue layer and no cracks and other defects are completely removed before the mandrel is surfacing, and the thickness of the surfacing is determined.

[007...

Embodiment 3

[0087] The mandrel base material is H13, the diameter is The length is 16m; the mandrel is used for rolling high-strength steel pipes.

[0088] The repair method of this mandrel is:

[0089] (1) Cleaning and inspection before repair: Clean and remove oil stains on the surface of the mandrel, and then inspect the mandrel to determine the processing size of the mandrel; the inspection mainly includes size inspection, deformation inspection, flaw detection, and appearance inspection.

[0090] (2) Processing before repair: According to the test results, a large CNC lathe is used to process the mandrel, mainly to remove the surface fatigue layer and eliminate defects such as cracks.

[0091] (3) Pre-surfacing inspection: Carry out flaw detection, dimension inspection, and hardness inspection on the mandrel, so as to ensure that the fatigue layer and no cracks and other defects are completely removed before the mandrel is surfacing, and the thickness of the surfacing is determined...

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Abstract

The invention discloses a method for repairing core rods for rolling seamless steel pipes. The method comprises the following specific steps: (1), cleaning and detecting before repairing; (2), machining before repairing; (3), detecting before surfacing; (4), surfacing and preheating; (5), surfacing to recover the size; (6), carrying out heat treatment after surfacing; (7), machining after surfacing; (8), detecting before laser cladding; (9), carrying out high-speed laser cladding by carrying out strengthening treatment on the surfaces of core rods by adopting high-speed laser cladding, wherein the used powder material is alloy powder with excellent wear resistance, corrosion resistance and plasticity and toughness; (10), machining after cladding; and (11), detecting finished products. According to the method, the wear resistance, the corrosion resistance and the cold and hot fatigue resistance of the core rods can be greatly improved; the service life of the core rods reaches more than 1.5 times of that of a new product; meanwhile, the whole repairing and manufacturing process is green and pollution-free.

Description

technical field [0001] The invention relates to the field of mandrel repair methods, in particular to a repair method for mandrels for rolling seamless steel pipes. Background technique [0002] The mandrel is a hot deformation tool for rolling seamless steel pipes in the continuous rolling mill, and is mainly used to perforate the billet at high temperature. The working conditions of the mandrel are extremely complex and harsh: the temperature of the hot-rolled mandrel is high during rolling, and it must bear high axial tensile stress and radial compressive stress; the mandrel is in an unstable temperature field during use. Among them, the service temperature is as high as 1150°C, and the surface temperature rises to 700°C, and it is water-cooled after use to withstand alternating cycles of cold and heat and thermal wear. Therefore, the main failure mode of the mandrel is local cracks and excessive wear. When the mandrel fails, in order to save costs, the mandrel is gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00B23K9/04B23K9/18B23K9/235B23K9/32C23C24/10
CPCB23P6/00B23K9/18B23K9/235B23K9/32B23K9/04C23C24/103
Inventor 吴松董振启黄东保李申申娄家佳徐诚龙徐大林陈相君王星陈洛谭李雯
Owner 泰尔(安徽)工业科技服务有限公司
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