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Method for manufacturing stainless steel seamless tube

A manufacturing method and seamless pipe technology, applied in the field of manufacturing, can solve problems such as production technology, equipment level operation technology, product quality gap, inability to produce hot-rolled finished pipes, and poor capillary dimensional accuracy, so as to shorten the production cycle and reduce Good effect of cold working amount and surface quality

Inactive Publication Date: 2012-01-18
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the international advanced level, there is still a big gap in the production process, equipment level, operation technology and product quality of stainless steel pipes in my country.
[0003]The current production of stainless steel rolled tubes is almost always perforated + cold treatment (cold rolling, cold drawing) production process, this process cannot produce hot rolled finished tubes, only The conical piercer in the rolling mill is used instead of the subsequent hot rolling mill, leveling mill and sizing mill
Due to the "Mannesmann effect" in the process of cross-rolling and piercing, the low plasticity of stainless steel, the narrow heating temperature range, and the temperature rise during deformation, the produced capillary has poor dimensional accuracy and thicker tube wall
Further, the cold working deformation is large, the energy consumption is high, and the process cost is high
From the perspective of deformation characteristics, the extrusion process is the best deformation condition, because it has the characteristics of three-dimensional stress compression, which greatly exerts the plastic deformation of metals, and is very suitable for the manufacture of high-end products such as stainless steel, but its manufacturing process The characteristics cause the metal yield to be low, the cost is high, and there are only few enterprise applications

Method used

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  • Method for manufacturing stainless steel seamless tube
  • Method for manufacturing stainless steel seamless tube
  • Method for manufacturing stainless steel seamless tube

Examples

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no. 1 example

[0045] The first embodiment of the present invention proposes a method for manufacturing stainless steel seamless pipes, the process of which is as follows figure 1 shown, including:

[0046] Step 101, pretreating the tube blank;

[0047] Step 102, heat-treating the tube blank;

[0048] Step 103, cross-rolling and piercing the tube blank, and cross-rolling and extending;

[0049] Step 104, performing cold rolling and / or cold rolling on the tube blank after micro-tension reduction.

[0050]

no. 2 example

[0052] The second embodiment of the present invention proposes a stainless steel seamless pipe manufacturing method for manufacturing No. 304 seamless steel pipe with a diameter of 108 mm and a length of 8 meters; a pipe blank with a diameter of 120 mm and a length of 1500 mm is used. The flow process of the stainless steel seamless pipe manufacturing method of the second embodiment of the present invention is as follows figure 2 shown, including:

[0053] Step 201, skinning and centering the tube blank. Wherein, peeling is to remove the skin of the tube blank, and the thickness of the removed skin is 0.6mm. Centering is to open a hole with a diameter of 30mm and a depth of 10mm at the center of the tube blank to determine the center of the tube blank. Then you can further inspect, grind and clean the tube blank. The inspection can be carried out with the naked eye to confirm that there are cracks, scars and other defects on the surface of the round billet. Grinding can u...

no. 3 example

[0061] The third embodiment of the present invention proposes a stainless steel seamless pipe manufacturing method, which is used to manufacture No. 316 seamless steel pipe with a diameter of 178 mm and a length of 10 meters; a pipe blank with a diameter of 175 mm and a length of 2000 mm is used. The flow process of the stainless steel seamless pipe manufacturing method of the third embodiment of the present invention includes:

[0062] Step 301, skinning and centering the tube blank. Wherein, peeling is to remove the skin of the tube blank, and the thickness of the removed skin is 0.8mm. Centering is to open a hole with a diameter of 40mm and a depth of 15mm at the center of the tube blank to determine the center of the tube blank. Then you can further inspect, grind and clean the tube blank. The inspection can be carried out with the naked eye to confirm that there are cracks, scars and other defects on the surface of the round billet. Grinding can use a grinder to grind ...

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Abstract

The invention provides a method for manufacturing a stainless steel seamless tube, which comprises the following steps of: firstly, pre-treating a tube blank; secondly, carrying out heating treatment on the tube blank; thirdly, carrying out cross piercing as well as obliquely cross-rolling elongation on the tube blank; and fourthly, carrying out slight-stretch reducing mill on the tube blank and then carrying out cold rolling and / or cold rolling. Compared with the prior art, in the embodiment of the method disclosed by the invention, the work procedures of cross-rolling elongation and slight-stretch reducing are added, so that the processed tube blank has the advantages of larger size, high yield, favorable surface quality and small coping amount.

Description

technical field [0001] The invention relates to the field of manufacturing, in particular to a method for manufacturing stainless steel seamless pipes. Background technique [0002] China is a big country of steel, with a history of more than 40 years of production of stainless steel seamless pipes. Especially in the last 20 years, the production technology of stainless steel seamless pipe has made great progress. However, compared with the international advanced level, my country's stainless steel pipes still have a large gap in terms of production technology, equipment level, operation technology, and product quality. [0003] The current production of stainless steel rolled pipes almost all adopts the production process of piercing + cold treatment (cold rolling, cold drawing). This process cannot produce hot-rolled finished pipes. Hot rolling mills, leveling mills and sizing mills. Due to the "Mannesmann effect" in the process of cross-rolling and piercing, the low pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21B19/04B21B19/10B21B15/00
Inventor 王黎晖庞于思张亚彬杨永亮安志平杨乃占陈玉娥
Owner XINXING DUCTILE IRON PIPES CO LTD
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