Ductile stainless steel pipe and heat pump system comprising the same

Patent metadata

Field	Value
Publication number	US-2018283584-A1
Application number	US-201815913567-A
Country	US
Kind code	A1
Filing date	Mar 6, 2018
Priority date	Mar 31, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

Provided is a ductile stainless steel pipe made of stainless steel having an austenite type matrix structure and containing a copper component. The ductile stainless steel pipe has a delta ferrite matrix structure of about 1% or less on the basis of a grain area. The ductile stainless steel pipe includes a steel pipe having a set outer diameter to carry a refrigerant of an air conditioner. R410a is used as the refrigerant, and the ductile stainless steel pipe has a minimum thickness determined based on a saturated pressure of the refrigerant.

First claim

What is claimed is:

1 . A ductile pipe comprising:
a ductile stainless steel pipe configured to receive a refrigerant, the ductile stainless steel pipe being formed of stainless steel having an austenite matrix structure and containing a copper component, wherein, based on grain area, at least 99% of the ductile stainless steel pipe comprises the austenite matrix structure and 1% or less of the ductile stainless steel pipe comprises a delta ferrite matrix structure, wherein the ductile stainless steel pipe has a set outer diameter and a minimum thickness that is based on a design pressure of the refrigerant.

2 . The ductile pipe of claim 1 , wherein the refrigerant is R410 refrigerant.

3 . The ductile pipe of claim 2 , wherein the set outer diameter is 7.00 mm and the minimum thickness is 0.18 mm.

4 . The ductile pipe of claim 2 , wherein the set outer diameter is 7.94 mm and the minimum thickness is 0.20 mm.

5 . The ductile pipe of claim 2 , wherein the set outer diameter is 9.52 mm and the minimum thickness is 0.24 mm.

6 . The ductile pipe of claim 2 , wherein the set outer diameter is 12.70 mm and the minimum thickness is 0.33 mm.

7 . The ductile pipe of claim 2 , wherein the set outer diameter is 15.88 mm and the minimum thickness is 0.41 mm.

8 . The ductile pipe of claim 2 , wherein the set outer diameter is 19.05 mm and the minimum thickness is 0.49 mm.

9 . The ductile pipe of claim 2 , wherein the set outer diameter is 22.20 mm and the minimum thickness is 0.57 mm.

10 . The ductile pipe of claim 2 , wherein the set outer diameter is 22.40 mm and the minimum thickness is 0.65 mm.

11 . The ductile pipe of claim 2 , wherein the set outer diameter is 28.00 mm and the minimum thickness is 0.72 mm.

12 . The ductile pipe of claim 2 , wherein the set outer diameter is 31.80 mm and the minimum thickness is 0.81 mm.

13 . The ductile pipe of claim 2 , wherein the set outer diameter is 34.90 mm and the minimum thickness is 0.89 mm.

14 . The ductile pipe of claim 2 , wherein the set outer diameter is 38.10 mm and the minimum thickness is 0.98 mm.

15 . The ductile pipe according to claim 1 , wherein the design pressure is 4.15 MPa.

16 . A heat pump system having an outdoor unit and an indoor unit, wherein the outdoor unit comprises the ductile stainless steel pipe as claimed in claim 1 .

17 . A ductile pipe, comprising:
a ductile stainless steel pipe configured to receive a refrigerant, the ductile stainless steel pipe being formed of a stainless steel material comprising an austenite matrix structure, wherein, based on grain area, at least 90% of the ductile stainless steel pipe is made of the austenite matrix structure and 1% or less of the ductile stainless steel pipe is made of a delta ferrite matrix structure, wherein the ductile stainless steel pipe has a set outer diameter and a minimum thickness that is determined based on a design pressure of the refrigerant.

18 . The refrigeration circuit of claim 16 , wherein the refrigerant is R410a.

Assignees

• Lg Electronics Inc

Inventors

• Hong Seokpyo

Classifications

• C21D8/10

  during manufacturing of tubular bodies · CPC title

• F16L9/02 Primary

  of metal (F16L9/16 - F16L9/22 take precedence) · CPC title

• C21D2211/001

  Austenite · CPC title

• F24F1/32 Primary

  for connecting the separate outdoor units to indoor units · CPC title

• C22C38/42

  with copper · CPC title