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Austenitic stainless steel pipe exhibiting excellent wrinkle resistance

A technology of austenitic stainless steel, wrinkle resistance, applied in the field of austenitic stainless steel pipes, which can solve problems such as wrinkles, shape changes, and difficulties

Inactive Publication Date: 2018-07-17
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, since 304 steel, which is the most widely used austenitic stainless steel, exhibits severe work hardening, it is very difficult to bend a pipe made of 304 steel by manpower in the space where the pipe is installed
[0005] In addition, austenitic stainless steel has a problem that a shape change, such as wrinkling, occurs in the bending process of a tube made of it
Disadvantageously consumes additional cost and time when wrinkles are removed by polishing

Method used

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  • Austenitic stainless steel pipe exhibiting excellent wrinkle resistance
  • Austenitic stainless steel pipe exhibiting excellent wrinkle resistance
  • Austenitic stainless steel pipe exhibiting excellent wrinkle resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments shown here, but may be implemented in another form. To clarify the present invention, parts irrelevant to the present invention may be omitted, and the size of components may be slightly exaggerated to facilitate understanding of the present invention.

[0024] An austenitic stainless steel pipe having excellent wrinkle resistance according to one embodiment of the present invention contains: on a weight % basis, silicon (Si): 0.1% to 0.65%, manganese (Mn): 0.2% to 3.0%, nickel (Ni) : 6.5% to 12.0%, chromium (Cr): 14.5% to 20.5%, copper (Cu): 6.0% or less (excluding 0), sum of carbon (C) and nitrogen (N): 0.13% or more Less (...

Embodiment

[0065] Austenitic stainless steel slabs containing the composition of each of Inventive Examples 1 to 19 and Comparative Examples 1 to 11 summarized in Table 1 below were produced by continuous casting. Subsequently, the austenitic stainless steel slab was subjected to hot rolling, and cold rolling to a total reduction ratio of 50%, thereby manufacturing a cold-rolled steel sheet. Steel pipes were produced using the obtained cold-rolled steel sheets.

[0066] Subsequently, steel pipe properties, such as grain size and yield strength, are measured. The steel pipe is bent at 90°, and the appearance of wrinkles is observed with the naked eye.

[0067] [Table 1]

[0068]

[0069]

[0070] [Table 2]

[0071]

Particle size (ASTM)

Yield strength (MPa)

Invention Example 1

5.8

169

Invention Example 2

5.7

171

Invention Example 3

6.0

172

Invention Example 4

6.0

172

Invention Example 5

6.5

176

...

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PUM

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Abstract

Disclosed is an austenitic stainless steel pipe exhibiting excellent wrinkle resistance. The disclosed austenitic stainless steel pipe comprises, in wt%, silicon (Si): 0.1-0.65%, manganese (Mn): 0.2-3.0%, nickel (Ni): 6.5-12.0%, chromium (Cr): 14.5-20.5%, copper (Cu): 6.0% or less (excluding 0), carbon (C) and nitrogen (N): 0.13% or less (excluding 0), and a remainder made up by Fe and inevitableimpurities, wherein formula (1) below on the outer diameter (D) of the steel pipe and the thickness (t) of the steel pipe is satisfied, and yield strength is 195MPa or less: D / t>=20 ------ Formula (1).

Description

technical field [0001] The present invention relates to an austenitic stainless steel pipe having excellent wrinkle resistance, and more particularly to an austenitic stainless steel pipe which is easily bent by human power and whose bent portion does not wrinkle during bending work. Background technique [0002] Traditionally, attempts have been made to apply stainless steel to refrigerant pipes of home air conditioners and car air conditioners because stainless steel not only has superior corrosion resistance than other materials, but is also relatively cheap. [0003] However, since the refrigerant pipe of the air conditioner is installed due to the limitation of the installation space, the refrigerant pipe is basically bent by manpower in many cases. In these cases, conventional copper or aluminum pipes do not cause any problems due to their sufficient ductility, but general stainless steel does not have the flexibility that is basically necessary for pipe installation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/42C22C38/02C22C38/00F16L9/02
CPCC22C38/00C22C38/02C22C38/42F16L9/02C21D6/004C21D9/08C22C38/001C22C38/04C22C38/58C21D8/105C21D2211/001
Inventor 姜亨求金相锡田锺尽宋秉俊郑汉容
Owner POHANG IRON & STEEL CO LTD