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A perforated plug and its surface treatment method

A perforated plug and surface treatment technology, which is applied in coating, metal rolling, metal material coating process, etc., can solve problems such as peeling, poor plasticity, and unsuitable thickness of oxide layer, so as to enhance heat insulation effect and improve service life , the effect of increasing the effective thickness

Active Publication Date: 2016-09-28
CHANGZHOU BAOLING HEAVY IND MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the poor plasticity and brittleness of the oxide, the oxide layer should not be thick, otherwise the oxide layer will not be firmly bonded to the substrate or even peel off. Generally, the thickness of the oxide layer on the surface of the plug is about 0.2-0.8mm (the maximum is not more than 1.0mm) ), and its structure is divided into inner and outer layers, and the thickness of the effective oxide layer that actually plays a protective role in use is only 1 / 2 of the total thickness of the oxide layer. Two to three high-alloy pipes made of super 13Cr and other materials are scrapped. For manufacturers, the cost of perforated plugs is actually too high

Method used

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  • A perforated plug and its surface treatment method
  • A perforated plug and its surface treatment method
  • A perforated plug and its surface treatment method

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Experimental program
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Effect test

Embodiment 1

[0030] The surface of the taper part and the end face of the head of the perforated plug processed in the normal shape are mechanically added to obtain several intervals of annular grooves. The width of the annular groove is b=0.5mm, the pitch t=1mm, and the depth h=1mm. In the heating furnace, the temperature is raised to 1000°C, and an oxidizing medium is introduced, and the temperature is kept for 7 hours for oxidation treatment, and then the temperature is lowered to 900°C, and slowly cooled to room temperature after being out of the furnace. The metallographic photos obtained under a microscope of 50 times the plug body after being baked are as follows: image 3 As shown, the oxide layer almost fills the annular groove. After testing, the thickness of the oxide layer on the surface of the substrate is 3.3 mm, which is more than three times the thickness of the existing oxide layer.

Embodiment 2

[0032] On the surface of the taper part of the perforated plug that has been processed in normal shape, several intervals of annular grooves are obtained by mechanically adding. The width of the annular groove is b=1.5mm, the pitch t=3mm, and the depth h=2mm. Put the plug into the heating furnace. Raise the temperature to 1050°C, pass through the oxidizing medium, keep it warm for 8 hours, carry out oxidation treatment, then cool down to 850°C, and slowly cool to room temperature after being out of the furnace. The metallographic photos obtained under a microscope of 50 times the plug body after being baked are as follows: Figure 4 As shown, after testing, the thickness of the oxide layer on the surface of the substrate is 3 mm, which is 3 times higher than the thickness of the existing oxide layer.

Embodiment 3

[0034]On the surface of the taper part of the perforated plug that has been processed in normal shape, several intervals of annular grooves are obtained by mechanically adding, the width of the annular groove b=2.5mm, the pitch t=3.5mm, the depth h=3mm, and the plug is placed in the heating furnace , heat up to 1100°C, pass through an oxidizing medium, keep warm for 10 hours, carry out oxidation treatment, then cool down to 800°C, and slowly cool to room temperature after being out of the furnace. The metallographic photos of the plug body after being baked under a microscope at 50 times are as follows: Figure 5 As shown, after testing, the thickness of the oxide layer on the surface of the substrate is 2.5 mm, which is more than 2 times the thickness of the existing oxide layer.

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Abstract

The invention discloses a method for surface treatment of a perforated plug, which comprises the following steps: step 1, obtaining a spiral or ring-shaped base body integrated with the plug body through processing on the circumferential surface of the plug body and the end face of the head, the base body Form a spiral groove or an annular groove with the substrate; step 2, put the plug body obtained in step 1 into a heating furnace, raise the temperature to 900-1100°C, pass in an oxidizing medium, keep it warm for 5-10 hours, and then cool down to 800°C -900°C, slowly cool to room temperature after being out of the furnace, and continuously form a layer of oxide layer on the bottom and side walls of the spiral groove or annular groove and the surface of the substrate. The method for treating the surface of the perforated plug increases the effective thickness of the oxide layer, thereby increasing the service life of the plug.

Description

technical field [0001] The invention relates to the field of seamless steel pipe production, in particular to a piercing plug and a surface treatment method for pipe blank piercing and capillary reaming. Background technique [0002] The perforated plug is subjected to complex rolling force, friction, and alternating heat and cold thermal stress during use. In order to effectively improve the service life of the plug, the best way at present is to form a layer of thermal insulation and lubrication on the surface of the plug through heat treatment. Oxidation layer, or a layer of protective layer with good high temperature strength and wear resistance, heat insulation and lubricating effect is coated on the surface of the plug through composite treatment technology. The quality of the protective layer has become a key factor in determining the life of the plug. [0003] At present, the general method is oxidation treatment: the surface is processed to the specified shape and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/02B21B25/00B21B19/04
Inventor 朱建军全小兵陈明潘强诸长伟
Owner CHANGZHOU BAOLING HEAVY IND MACHINERY
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