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Manufacturing method of stainless steel square pipe

A manufacturing method and technology of stainless steel pipes, which are applied in the field of steel material forming, can solve the problems of corrosion resistance and adverse effects of external dimensions, high process costs, etc.

Active Publication Date: 2017-07-11
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the safety requirements of the nuclear power application environment, the welding process requires the full length of the weld to be free of defects, which puts extremely high requirements on the welding process and non-destructive testing, and the process cost is high; at the same time, the welding residual stress is also unfavorable to the corrosion resistance and external dimensions. influences

Method used

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  • Manufacturing method of stainless steel square pipe
  • Manufacturing method of stainless steel square pipe
  • Manufacturing method of stainless steel square pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Processing step of the present invention is:

[0083] Tube blank → hot extrusion → cold processing → solution annealing heat treatment in protective atmosphere → cleaning → penetration inspection → ultrasonic inspection → visual and dimensional inspection → packaging.

[0084] The stainless steel that the present invention adopts, its component mass fraction is

[0085] C:≤0.065;

[0086] Mn: ≤2.00;

[0087] P: ≤0.035;

[0088] S: ≤0.005;

[0089] Si: ≤1.00;

[0090] Ni: 8.00-10.50;

[0091] Cr: 18.00-20.00;

[0092] Co:≤0.05;

[0093] Example 1

[0094] The finished product size is 203×203×12.7mm. Using hot extrusion + cold deformation process, using Φ450mm forged round ingot, extruded into Φ325×24mm round tube, cold rolled to get Φ264×14mm round tube, cold drawn to get 220×220×14mm square tube, cold drawn to get 203×203 ×12.7mm square tube. After solid solution annealing heat treatment in protective atmosphere, cleaning, penetration test, ultrasonic test, v...

Embodiment 2

[0096] The finished product size is 220×220×12mm. Using hot extrusion + cold deformation process, using Φ450mm forged round ingot, extruded into Φ325×18mm round tube, cold rolled to get Φ325×14mm round tube, cold drawn to get 236×236×14mm square tube, cold drawn to get 220×220 ×12mm square tube. After solid solution annealing heat treatment in protective atmosphere, cleaning, penetration test, ultrasonic test, visual and dimensional test, the finished product is obtained.

Embodiment 3

[0098]The finished product size is 250×250×15mm. Adopt hot extrusion + cold deformation process, use Φ450mm forged round ingot, extrude into Φ325×20mm round tube, cold draw to get Φ325×18mm round tube, cold draw to get 270×270×17mm square tube, cold draw to get 250×250 ×15mm square tube. After solid solution annealing heat treatment in protective atmosphere, cleaning, penetration test, ultrasonic test, visual and dimensional test, the finished product is obtained.

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Abstract

The invention discloses a manufacturing method of a stainless steel square pipe. A forged round ingot is adopted as a pipe billet and subjected to hot extrusion, cold deformation, heat treatment and surface treatment to form a finished product. The method comprises the specific steps that 1, a semi-finished round pipe corresponding to the finished product in size is prepared from the stainless steel pipe billet through the seamless forming technology comprising hot extrusion and cold rolling / cold drawing; 2, a square pipe meeting size requirements is prepared from the semi-finished round pipe through a two-pass drawing method, wherein the first pass is sink drawing, and the second pass is short mandrel liner drawing; and 3, heat treatment is carried out, wherein a roller bottom type heat treatment furnace is adopted for the finished product for solid solution heat treatment, and the heat treatment process comprises four stages. The stainless steel square pipe can be applied to waste heat exhaust heat exchangers of third-generation nuclear reactors such as AP1000, CAP1000, CAP1400 and Hualong One, has the special section shape, high corrosion resistance, high surface smoothness and high boundary dimension precision and is required to pass strict ultrasonic flaw detection and liquid penetrating tests.

Description

technical field [0001] The invention relates to a method for manufacturing a stainless steel square tube, which belongs to the technical field of forming iron and steel materials. Background technique [0002] The waste heat discharge heat exchanger is the core safety component of the third-generation fission nuclear reactor. It is used to discharge heat to protect the core in an emergency. At present, the main types of reactors developed in my country, such as AP1000, CAP1000, CAP1400, and Hualong No. 1, all use similar waste heat discharge. Heat exchanger design. The stainless steel square tube involved in this article is one of the main structural components of the waste heat removal heat exchanger. [0003] Since this part is in contact with seawater and is not repaired and replaced during the reactor operating cycle, the product is required to have high corrosion resistance, especially chloride corrosion resistance; uniform corrosion and pitting corrosion resistance req...

Claims

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Application Information

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IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 王伯文拓雷锋尹嵬郑文杰姚鹏升康喜唐侯楠黎毅
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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