Method for manufacturing martensitic stainless steel continuous casting billet extruded seamless pipe

A martensitic stainless steel and manufacturing method technology, applied in the field of steel manufacturing, can solve the problems of uneven product quality, insufficient technical ability, and high manufacturing cost, and achieve the effects of stable product quality, prominent process advantages, and reduced cost

Inactive Publication Date: 2020-06-02
江阴华润制钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although L80-13Cr is a steel grade in the API standard, most domestic steel pipe manufacturers do not have the advantage of steelmaking in the production of high-alloy steel pipes, and most of the manufacturers' threaded buttons are processed into API standard button types, which currently lead to corrosion resistance, Some L80-13Cr oil well pipes for ultra-deep wells are still imported, and the L80-13Cr produced by domestic steel mills is not up to standard due to some technical capabilities, resulting in uneven quality of products on the market and relatively high manufacturing costs.

Method used

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  • Method for manufacturing martensitic stainless steel continuous casting billet extruded seamless pipe
  • Method for manufacturing martensitic stainless steel continuous casting billet extruded seamless pipe
  • Method for manufacturing martensitic stainless steel continuous casting billet extruded seamless pipe

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Embodiment 1

[0029] A method for manufacturing a martensitic stainless steel continuous casting slab extruded seamless pipe, the steps are as follows:

[0030] The first step is blank preparation. The material of the continuous casting blank is L80-13Cr, and the specification of the continuous casting blank is Φ430mm.

[0031] The second step is peeling and segmentation. Since the surface of the continuous casting slab is rough, peeling processing is required. The processing specification is Φ415mm, and the segment length is 820mm.

[0032] The third step is drilling and processing the bell mouth. Since the continuous casting billet is characterized by looseness and shrinkage holes in the center, which are not conducive to extrusion, but the extrusion process is characterized by the center of the billet needs to be drilled, and the diameter of the drilled hole is 80mm, and the end processing bell mouth, the bell mouth taper is 42°.

[0033] The fourth step is cleaning and preheating. Afte...

Embodiment 2

[0039] A method for manufacturing a martensitic stainless steel continuous casting slab extruded seamless pipe, the steps are as follows:

[0040] The first step is blank preparation. The material of the continuous casting blank is L80-13Cr, and the specification of the continuous casting blank is Φ220mm.

[0041] The second step is peeling and segmentation. Since the surface of the continuous casting slab is rough, peeling processing is required. The processing specification is Φ213mm, and the segment length is 541mm.

[0042] The third step is drilling and processing the bell mouth. Since the continuous casting billet is characterized by looseness and shrinkage holes in the center, which are not conducive to extrusion, but the extrusion process is characterized by the center of the billet needs to be drilled, and the diameter of the drilled hole is 30mm, and the end processing bell mouth, the bell mouth taper is 38°.

[0043] The fourth step is cleaning and preheating. After ...

Embodiment 3

[0049] A method for manufacturing a martensitic stainless steel continuous casting slab extruded seamless pipe, the steps are as follows:

[0050] The first step is blank preparation. The material of the continuous casting blank is L80-9Cr, and the specification of the continuous casting blank is Φ310mm.

[0051] The second step, peeling and segmentation, due to the rough surface of the continuous casting slab, peeling processing is required, the processing specification is Φ299mm, and the segment length is 634mm;

[0052] The third step is drilling and processing the bell mouth. Since the continuous casting billet is characterized by looseness and shrinkage holes in the center, which are not conducive to extrusion, but the extrusion process is characterized by the center of the billet needs to be drilled, and the diameter of the drilled hole is 65mm, and the end processing bell mouth, the bell mouth taper is 42°.

[0053] The fourth step is cleaning and preheating. After the...

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Abstract

The invention discloses a method for manufacturing a martensitic stainless steel continuous casting billet extruded seamless pipe. The method comprises the following steps of firstly, preparing a martensitic stainless steel continuous casting billet; secondly, peeling and segmenting the surface of the continuous casting billet; thirdly, drilling the continuous casting billet and processing a bellmouth on the end face; fourthly, cleaning and preheating the continuous casting billet; fifthly, carrying out induction heating and lubricant rolling on the continuous casting billet; sixthly, addinga lubricant to the bell mouth and expanding the hole; seventhly, carrying out induction heating again, adding lubricant inside and rolling the continuous casting billet with lubricant outside; and eighthly, preparing a tool and a mold and performing extrusion molding. According to the extrusion method for the martensitic stainless steel continuous casting billet provided by the invention, the rawmaterial is the continuous casting round billet, the defects of loose center, shrinkage holes and the like of the continuous casting billet are removed through outside peeling and inside drilling, thecenter quality of the continuous casting billet is improved through hole expanding, and the martensitic stainless steel seamless pipe is produced through an extrusion process. The seamless steel pipeproduced in the invention is low in manufacturing cost and good in inner and outer surface quality, and the size of the steel pipe can meet the requirements of customers.

Description

technical field [0001] The present invention generally relates to the field of iron and steel manufacturing, and in particular relates to a process method in which martensitic stainless steel is directly extruded into seamless pipes by continuous casting slabs. Background technique [0002] The martensitic stainless steel seamless pipe of the present invention is mainly used in the oil and gas well industry. At present, the oil well pipe is mainly divided into two categories, one is the oil well pipe produced according to the API standard, and the other is the oil well pipe produced according to the non-API standard. Although L80-13Cr is a steel grade in the API standard, most domestic steel pipe manufacturers do not have the advantage of steelmaking in the production of high-alloy steel pipes, and most of the manufacturers' threaded buttons are processed into API standard button types, which currently lead to corrosion resistance, Some L80-13Cr oil well pipes for ultra-deep...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21C23/08B21C23/00C22C38/18C22C38/44
CPCB21C23/002B21C23/085B21C37/06C22C38/18C22C38/44
Inventor 张亚彬庞于思凌元祥郭长华廖斌
Owner 江阴华润制钢有限公司
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